Appendix I Specification for Substation LV Monitoring Equipment

Transcription

1 SSEPD Low Carbon Networks Fund Tier 1 Project Close-Down Report SSET1002 Demonstrating the benefits of monitoring LV network with embedded PV panels and EV charging point Appendix I Specification for Substation LV Monitoring Equipment Southern Electric Power Distribution 2013

2 SSEPD Low Carbon Networks Fund Tier 1 Project Close-Down Report SSET1002 Demonstrating the benefits of monitoring LV network with embedded PV panels and EV charging point Specification for Substation LV Monitoring Equipment Overall Requirements The LV monitoring equipment should be suitable for retrofit and be suitable for deployment at all distribution substation (11/ 0.4kV) locations within SSEPD. Typical locations where monitoring equipment may be deployed include: Outdoor substations supplying many distributed customers, these typically supply customers via multicore cables connected to an LV fuse cabinet. The LV equipment where monitoring devices are to be installed are typically constructed as metal clad units, they may be transformer mounted or free standing. Outdoor/ indoor substations supplying individual large industrial/ commercial customers, these are typically supplied via single core or multiple single core cables which feed directly from the substation. Within the substation the single core supply cables may be connected directly into a transformer cable end box or LV switchgear (MCCB/ ACB) located within an LV fuse cabinet. Indoor substations supplying many distributed customers, these typically supply customers via multicore cables connected to an LV fuseboard. In older substations the LV fuseboard may be wall mounted with open access around the unit. In modern indoor substations the equipment installed will be the same as modern outdoor installations. Monitoring Equipment Requirements The equipment to be installed must be capable of being safely installed whilst maintaining supplies to customers connected to the network to be monitored. Given the many different types of LV distribution equipment that is deployed by SSE Power Distribution on its networks and the many different location types it is essential that any retrofit monitoring equipment deployed is flexible and scalable. It must be capable of being deployed in both indoor and Southern Electric Power Distribution 2013

3 SSEPD Low Carbon Networks Fund Tier 1 Project Close-Down Report SSET1002 Demonstrating the benefits of monitoring LV network with embedded PV panels and EV charging point outdoor locations and suit the LV feeder connection arrangements and physical size constraints for the circumstances detailed above. Values to be Measured As indicated above there are numerous situations where LV monitoring equipment could be deployed on SSEPD s power distribution networks. The values to be measured by monitoring equipment needs to be matched to substation connection / feeding arrangements. Details of current ratings for specific applications are detailed below: For connections to multicore cables connected at distribution substations the operating current range will be between 0 and 500 Amperes per phase. For large single core cable connections to single customers (commercial/ industrial) the operating current range will be between 0 and 2000A per phase. For connections at pole mounted transformer locations (for all connected circuit types) the operating current range will be between 0 and 400 Amperes per phase In all three cases detailed above there could be times when current flowing exceeds the upper value (system overload / faults) it is therefore necessary to allow for this in the design of the system. Details regarding voltage measurements are detailed below. For a 3 phase ac distribution system in the UK the declared supply voltage is 400/ 230V (+10% - 6%), this gives a range of 440/ 253V (upper level) to 376/ 216.2V (lower level). For a split phase ac distribution system (which is generally operated in rural areas) the declared supply voltage is 460/ 230V (+10% - 6%), this gives a range of 506/ 253V (upper level) to 432.4/ 216.2V (lower level). For a single phase ac distribution system the declared supply voltage is 230V (+10% - 6%), this gives a range of 253V (upper level) to 216.2V (lower level). Southern Electric Power Distribution 2013

4 SSEPD Low Carbon Networks Fund Tier 1 Project Close-Down Report SSET1002 Demonstrating the benefits of monitoring LV network with embedded PV panels and EV charging point Given that voltage may fall out with the above ranges for a number of operating reasons (both high and low) it is important that excursions out with these values can be measured/ monitored. The voltage measurement operating range should therefore be between 0 and 600V Other measurements will be derived/ calculated from the current and voltage measurements. It is important that the 3 phase vector relationship is measured, maintained and used to provide the 4 quadrant measurements required (see below). High level principles for design of the monitoring solution will be as follows: The system will use sensing technology that can be safely fitted to a live cable (interruptions to supplies are unacceptable). Current will be measured for each phase and neutral for each LV feeder being measured. Voltage will be measured at the distribution substation LV busbars. Voltage and current measurements (above) will be used to calculate power measurements (four quadrant; real/ reactive, import/ export), details of measurements required can be found in table 1. A local processor in the substation will enable data from sensors to be received, processed, forwarded and stored (for back up purposes). The system will be capable of processing/ forwarding data at different rates, these are: o Normal data rate, i.e. half hourly data stored locally and transmitted daily o High data resolution, i.e. streaming 5 second data continuously (with no local storage). When operating in this mode the half hourly data (above) will still be required, this will provide protection from communications system failure. Processing of data to provide necessary outputs will be carried out locally (within the substation) in order to minimise traffic on the communications system. Measurements must be accurate to within +1% or -1% for current measurements, + or 0.5% for voltage measurements and + or 1.5% for power measurements. Local processor will be capable of interfacing with multiple communications solutions, the value provided by deploying a two way communications solution will need to be assessed. Southern Electric Power Distribution 2013

5 SSEPD Low Carbon Networks Fund Tier 1 Project Close-Down Report SSET1002 Demonstrating the benefits of monitoring LV network with embedded PV panels and EV charging point System design will enable sensors from multiple (different) manufacturers to be used. Calibration/ matching of sensor to logic/ storage device should be undertaken on site. System design will facilitate sensors of different sizes to be used. It may be necessary to deploy different sensor shapes and sizes in order to fit all physical constraints that may be found on site. System to provide normal rate data storage for a minimum period of 14 days (protection against communication systems failure). The platform will be scalable and be able to accept data for up to 5 individual LV feeders (maximum number of feeders for normal modern substation LV switchgear). The system will have the ability to summate multiple LV feeder information to provide details of total substation loading/ associated information, details of measurements required can be found in table 1. The system will be capable of delivering appropriate alarms on an unsolicited basis, details of alarms required can be found in table 1. Actual values being measured do not need to be displayed on the device, but the facility to connect a laptop computer on a plug and play basis, and to display the data on that computer should be allowed for. It should be possible to download a copy of the stored data to the laptop. Appropriate standards to be applied regarding the mechanical and electrical construction of the system. Appropriate weather protection to be applied. Additional channels to be made available for other/ future monitoring requirements (i.e. temperature, weather data etc.) The system will provide a value for money solution. Southern Electric Power Distribution 2013

6 SSEPD Low Carbon Networks Fund Tier 1 Project Close-Down Report SSET1002 Demonstrating the benefits of monitoring LV network with embedded PV panels and EV charging point Table 1 Details of Monitoring Requirements Sample Rate Transmit Value to be (Frequency of Frequency (s/s Measured Sample) centre) Monitoring Distribution Substation LV Feeder Voltage (V) max 1 second from 5 second to all phases 30 mins Volts Voltage (V) min 1 second from 5 second to all phases 30 mins Volts Voltage (V) mean 1 second from 5 second to All phases 30 mins Volts Phase current (I) 1 second from 5 second to max 30 mins all phases Amperes Retained Data (Local Storage Use for Data Requirements) 14 days Determine upper voltage achieved at feeder (for normal or normal/ high resolution) Modelling, Network Management 14 days Determine lowest voltage achieved at feeder (for normal or normal/ high resolution) Modelling, Network Management 14 days Determine mean voltage achieved at feeder (for normal or normal/ high resolution) Modelling, Network Management 14 days Determine highest current flow in feeder (for normal or normal/ high resolution) Modelling, Network Management Comments / Additional Information Measure 3 phase voltage on LV busbars Measure 3 phase voltage on LV busbars Measure 3 phase voltage on LV busbars Used in real and reactive power calculations Measure current in each phase Southern Electric Power Distribution 2013

7 SSEPD Low Carbon Networks Fund Tier 1 Project Close-Down Report SSET1002 Demonstrating the benefits of monitoring LV network with embedded PV panels and EV charging point Value to be Measured Sample Rate (Frequency of Sample) Transmit Frequency (s/s centre) Retained Data (Local Storage Requirements) Use for Data Comments / Additional Information Phase current (I) 1 second From 5 second to 14 days Determine lowest current flow in Measure current in each phase min 30 mins feeder (for normal or normal/ high all phases resolution) Amperes Modelling, Network Management Phase current (I) 1 second from 5 second to 14 days Determine mean current flow in Measure current in each phase mean rms 30 mins feeder (for normal or normal/ high Determine heating effect due to all phases resolution) current Amperes Modelling, Network Management Neutral current (I) 1 second from 5 second to 14 days Determine power flow (for normal or Measure neutral current to determine max 30 mins normal/ high resolution) power flow Amperes Modelling, Network Management Neutral current (I) 1 second from 5 second to 14 days Determine power (for normal or Measure neutral current to determine min 30 mins normal/ high resolution) power flow Amperes Modelling, Network Management Neutral current (I) 1 second From 5 second to 14 days Determine power flow and total Measure neutral current to determine mean 30 mins heating effect (for normal or normal/ power flow Amperes high resolution) Determine heating effect due to Modelling, Network Management current Southern Electric Power Distribution 2013

8 SSEPD Low Carbon Networks Fund Tier 1 Project Close-Down Report SSET1002 Demonstrating the benefits of monitoring LV network with embedded PV panels and EV charging point Value to be Measured Sample Rate (Frequency of Sample) Transmit Frequency (s/s centre) Retained Data (Local Storage Requirements) Use for Data Comments / Additional Information Power (P) 1 second from 5 second to 14 days Determine overall power flow for LV 4 quadrant power flow for feeder kw 30 mins feeder (for normal or normal/ high required resolution) Calculated from V, I elements Modelling, Network Management detailed above Reactive Power 1 second from 5 second to 14 days Determine overall reactive power flow 4 quadrant power flow for feeder (Q) 30 mins for LV feeder (for normal or normal/ required VAr high resolution) Calculated from V, I elements Modelling, Network Management detailed above Energy 30 mins from 5 second to 14 days Details the energy exported or The added time element is useful as kwh 30 mins imported from LV feeder (for normal this will assist in managing cable / or normal/ high resolution) plant ratings on loaded circuits Modelling Reactive energy 30 mins from 5 second to 14 days Details the reactive energy exported The added time element is useful as kvarh 30 mins or imported from LV feeder (for this will assist in managing cable / normal or normal/ high resolution) plant ratings on loaded circuits Modelling Harmonic content 1 second from 5 second to 14 days Management of Power Quality, up to Each phase of all cables % harmonic 30 mins 25th harmonic (odd and even) Monitor over time to determine the content affect of new devices connected (HP / EV etc.) Southern Electric Power Distribution 2013

9 SSEPD Low Carbon Networks Fund Tier 1 Project Close-Down Report SSET1002 Demonstrating the benefits of monitoring LV network with embedded PV panels and EV charging point Alarm - Distribution Substation LV Feeder No Volts (V) Volts <80% for >2 seconds 1 second Instantaneous 14 days Loss of supply indication At busbars of distribution substation as only one connection will be made per phase Low Volts (V) Volts <94% for >5 seconds 1 second Instantaneous 14 days Voltage out with statutory limits Remedial action may be required Modelling, Network Management At busbars of distribution substation as only one connection will be made per phase High Volts (V) Volts >110% for >5 seconds 1 second Instantaneous 14 days Voltage out with statutory limits Modelling, Network Management At busbars of distribution substation as only one connection will be made per phase Low Current (I) Amperes < 1% of CT rating for > 15 seconds 1 second Instantaneous 14 days Loss of supply indication for LV feeder / phase. Network Management Cannot use voltage for this functionality as we are proposing a single voltage connection for each phase in any substation. Threshold needs to be carefully considered to ensure desired effect especially when normal cable loading sometimes approaches zero Southern Electric Power Distribution 2013

10 SSEPD Low Carbon Networks Fund Tier 1 Project Close-Down Report SSET1002 Demonstrating the benefits of monitoring LV network with embedded PV panels and EV charging point High Current (I) Amperes > 80% of cable rating for >5 seconds ( reset at <70% of cable rating for > 5 seconds 1 second Instantaneous 14 days Indication that cable is approaching full load / capacity (say 80%) Modelling, Network Management High / High 1 second Instantaneous 14 days Indication that cable has reached full Current (I) load / capacity (say %%). Amperes Cable load needs to be reduced to > 100% of cable prevent long term damage. rating for > 5 Modelling, Network Management seconds Monitoring Summated Distribution Substation Transformer LV Output (or Input) Voltage (V) max 1 second from 5 second to 14 days Determine upper voltage achieved at all phases 30 mins busbars over sample period same Volts data (source) as for LV feeder Modelling, Network Management Voltage (V) min 1 second from 5 second to 14 days Determine lowest voltage achieved at all phases 30 mins busbars over sample period same Volts data (source) as for LV feeder Modelling, Network Management Information will be useful along with associated cable core temperature information to determine / validate future cyclic rating rules Information will be useful along with associated cable core temperature information to determine / validate future cyclic rating rules Measure 3 phase voltage on LV busbars Same reference as for individual LV feeder Measurement Measure 3 phase voltage on LV busbars Same reference as for individual LV feeder Measurement Southern Electric Power Distribution 2013

11 SSEPD Low Carbon Networks Fund Tier 1 Project Close-Down Report SSET1002 Demonstrating the benefits of monitoring LV network with embedded PV panels and EV charging point Voltage (V) mean 1 second from 5 second to 14 days Determine mean voltage achieved at Measure 3 phase voltage on LV All phases 30 mins busbars over sample period same busbars Volts data (source) as for LV feeder Same reference as for individual LV Modelling, Network Management feeder Measurement Used in real and reactive power calculations Phase current (I) 1 second from 5 second to 14 days Determine highest current flow at Measure current in each phase max 30 mins busbars (for normal or normal/ high Summated from individual phase all phases resolution) measurements for each LV feeder Amperes Modelling, Network Management Phase current (I) 1 second from 5 second to 14 days Determine lowest current flow at Measure current in each phase min 30 mins busbars (for normal or normal/ high Summated from individual phase all phases resolution) measurements for each LV feeder Amperes Modelling, Network Management Phase current (I) 1 second from 5 second to 14 days Determine mean current flow at Measure current in each phase mean rms 30 mins busbars (for normal or normal/ high Summated from individual phase all phases resolution) measurements for each LV feeder Amperes Modelling, Network Management Determine heating effect due to current Neutral current (I) 1 second from 5 second to 14 days Determine power flow (for normal or Measure neutral current to determine max 30 mins normal/ high resolution) power flow Amperes Modelling, Network Management Summated from individual LV feeder Neutral current (I) 1 second from 5 second to 14 days Determine power flow (for normal or Measure neutral current to determine min 30 mins normal/ high resolution) power flow Amperes Modelling, Network Management Summated from individual LV feeder Southern Electric Power Distribution 2013

12 SSEPD Low Carbon Networks Fund Tier 1 Project Close-Down Report SSET1002 Demonstrating the benefits of monitoring LV network with embedded PV panels and EV charging point Neutral current (I) 1 second from 5 second to 14 days Determine power flow and total Measure neutral current to determine mean 30 mins heating effect (for normal or normal/ power flow Amperes high resolution) Summated from individual LV feeder Modelling, Network Management Determine heating effect due to current Power (P) 1 second from 5 second to 14 days Determine overall power flow for 4 quadrant power flow for entire kw 30 mins distribution substation (for normal or distribution substation normal/ high resolution) Calculated from V, I elements Modelling, Network Management detailed above Reactive Power 1 second from 5 second to 14 days Determine overall reactive power flow 4 quadrant power flow for entire (Q) 30 mins for distribution substation (for normal distribution substation VAr or normal/ high resolution) Calculated from V, I elements Modelling, Network Management detailed above Energy 30 mins from 5 second to 14 days Details the energy exported or The added time element is useful as kwh 30 mins imported from distribution substation this will assist in managing cable / (for normal or normal/ high resolution) plant ratings on loaded circuits / Modelling transformers Reactive energy 30 mins from 5 second to 14 days Details the reactive energy exported The added time element is useful as kvarh 30 mins or imported from distribution this will assist in managing cable / substation (for normal or normal/ high plant ratings on loaded circuits / resolution) transformers Modelling Southern Electric Power Distribution 2013

13 SSEPD Low Carbon Networks Fund Tier 1 Project Close-Down Report SSET1002 Demonstrating the benefits of monitoring LV network with embedded PV panels and EV charging point Alarms Summated Distribution Substation Transformer LV Output (or Input) High Current (I) Amperes > 80% of transformer rating for > 5 seconds reset at <70% of transformer rating for >5 seconds 1 second Instantaneous 14 days Indication that transformer is approaching full load / capacity (say 80%) Modelling, Network Management High / High 1 second Instantaneous 14 days Indication that transformer has Current (I) reached full load / capacity (say 100 Amperes 105 %%). Cable load needs to be > 100% of reduced to prevent long term transformer rating damage. for > 5 seconds Modelling, Network Management Information will be useful along with associated transformer top tank temperature information to determine / validate future cyclic rating rules Information will be useful along with associated transformer top tank temperature information to determine / validate future cyclic rating rules Southern Electric Power Distribution 2013

14 SSEPD Low Carbon Networks Fund Tier 1 Project Close-Down Report SSET1002 Demonstrating the benefits of monitoring LV network with embedded PV panels and EV charging point Additional Information The above table details all monitoring and alarms that may need to be made available. It is probable that not all items will be enabled at any one specific location. Additionally a range of settings for operation of alarms and their resets is required to be programmable in the monitoring unit depending on the circuit it is to be connected to. This flexibility is required for both voltage and current alarms. Under current alarms on feeders have a longer time delay to allow them to be blocked should there be an under voltage alarm indicating loss of supplies. Spare measurement channels could be used for a number of future purposes including: Measurement of cable temperature (including rate of change of temperature) Measurement of transformer tank temperature (top and bottom) Weather related measurements (ambient temperature, humidity, wind speed/ direction and solar radiation etc.) Measurement of voltage flicker / excess current (indication of developing fault) Spare alarm channels could be used for a number of future purposes including: Cable temperature alarm Transformer tank alarm FPI indication Alarm indication of developing fault (see above) Further Work The specification/ system design for the complete end to end monitoring system followed by the deployment on site of the measuring devices (minus communications interface) will enable SSE to assess performance without the need for a fully integrated system. Once there is confidence that the measuring elements work correctly further work will be required to develop the communications elements and interface with existing SSE control systems. This work will follow once the site trial has proved to be successful. Southern Electric Power Distribution 2013

15 SSEPD Low Carbon Networks Fund Tier 1 Project Close-Down Report SSET1002 Demonstrating the benefits of monitoring LV network with embedded PV panels and EV charging point Appendix II Equipment at Distribution Substations Southern Electric Power Distribution 2013

16 The author / owner of this document is: Gideon Evans Future Networks and Policy This document has been approved for Issue by: Draft - Stewart A Reid, Future Networks and Policy Manager Date of Issue: Review Date: Oct 2012 Aug Introduction There is a growing requirement to install load/voltage monitoring equipment to the LV side of transformers/outgoing cables at distribution substations. The need for such equipment to be installed is driven by the development of smart grids and proposed trials to demonstrate and evaluate the potential for substation monitoring devices. This work instruction defines the principles that should be followed in order to connect this type of equipment. Where it is possible to install this type equipment DEAD this option must be taken, however it is recognised that in many cases it will be impractical to make the LV pillar or cabinet dead and therefore the guidance within this work instruction must be followed. Where appropriate, instruction for the installation of equipment will be specific depending upon the type of LV pillar or cabinet installed at the chosen location (see appendices), otherwise generic instructions regarding installation will be provided. 2. Management of Safety The following requirements will be complied with at all times throughout the installation process. 2.1.Safety rules and other procedures must be followed whilst undertaking work in accordance with this work instruction. The following documents are particularly relevant and must be adhered to at all times: Safety precautions and procedures applicable to low voltage systems as detailed in section 8 of the Operational Safety rules. Page 1 of 33

17 When work is to be undertaken in proximity to live LV conductors it is necessary to justify this decision. A risk assessment complying with PR-PS-421, Justification for Live Low Voltage Working is therefore required. 2.2.Prior to commencing work a full assessment of risk will be undertaken in accordance with SSE Injury Prevention Process. This will include a stage one assessment in advance of work commencing and a stage two on site assessment which shall be undertaken prior to work commencing. This assessment must be agreed by all members of the working party and signed off accordingly. 2.3.The working party will consist of at least two persons who will be appropriately authorised to undertake the proposed installation work in accordance with SSE Operational Safety Rules. 2.4.System control will be advised prior to work starting and upon completion of the work. 2.5.Personal Protective Equipment will be worn in accordance with SSE PPE matrix (see S&E Manual Section 1, Appendix 1 of WI-HSE-001). 3. General Requirements for Installation This work instruction provides detail regarding how to safely install LV monitoring equipment in distribution substations. It focuses on the methods to be followed in order to make the necessary voltage and current connections and collect information via appropriate sensors (Rogowski coils and transducers). It also provides guidance regarding the provision of suitable enclosures and the positioning of monitoring equipment within distribution substation types. Installation instructions for specific equipment types will be provided and generic installation instructions will be provided for situations where specific instruction is not appropriate. Page 2 of 33

18 3.1.Monitoring equipment will always be installed in accordance with manufacturer s instructions (see appendices). 3.2.Specific system communication requirements are not covered within this work instruction. 3.3.Voltage Connections Wherever possible existing voltage reference connections will be used. If this is not practicable or such connections do not exist other techniques will be applied using equipment and procedures described in this document. In all cases, the connecting leads will be fused Current References All current values will be obtained by using fully insulated sensing transducers or Rogowski coils. The sensors will be installed at suitable locations within the LV pillar / cabinet as follows: Around busbar / cable connections Around transformer links, making sure not to restrict the removal of links Where a generic installation instruction is to be followed a full assessment of options for the connection of voltage references and current sensors will be made prior to any work commencing. 3.6.Prior to work commencing a visual inspection of the LV pillar/ cabinet will be carried out with particular attention being made to positions where voltage reference connections are to be made or current sensors installed. If there is any doubt regarding the condition of the LV pillar/ cabinet work shall not commence and the issue shall be referred to the person responsible for instructing the installation. Page 3 of 33

19 3.7. Some LV pillars may contain asbestos, these are indicated with an A on the outside of the pillar. On the first door to open a photograph is fitted showing the location of the asbestos containing materials (ACMs). Providing these materials are not displaced during the installation work then the cabinet is safe to work on. If it is necessary to displace the ACMs then work will not commence until the ACMs have been safely removed. 4. Monitoring Equipment Installation Details for the installation of monitoring equipment are detailed in this section for: specific equipment types generic installation information 4.1. Lucy Trifca LV Cabinets. Refer to installation procedure detailed in Appendix A. 4.2.Generic instruction - Open LV fuse boards (indoor) and freestanding metal clad LV fuse pillars (outdoor). Refer to installation procedure detailed in Appendix B Generic Instruction LV fuse boards, cabinets and pillars containing supplies to customers fed via single or bunched wavecon cables with or without source circuit breakers (MCCB/ ACB) or fuses. Refer to installation procedure detailed in Appendix C 4.4. Generic Instruction - Pole Mounted Transformers Refer to installation procedure detailed in Appendix D Page 4 of 33

20 5. On- Site Installation Works (NOT LIVE WORK) 5.1 Ensure that the monitoring device (data aggregator / remote terminal unit) as supplied by the manufacturer is installed in an enclosure of suitable IP rating for the proposed location (IP55 is required for outdoor locations). If the manufacturer has not supplied a suitable enclosure, the installer will need to provide one. 5.2 Position of GRP Enclosure To ensure that no trip hazard is introduced the enclosure/ mounting should be placed at a suitable location within the substation. The actual location will be dependant upon the type and size of substation. Wherever possible the GRP should be fitted to a wall within the substation. If this is not feasible then a suitable location should be found so that it can be secured to the floor, in a position that does not impede operational tasks and does not pose a trip hazard. 5.3 If there is any history of a substation flooding and the device cannot be mounted high enough on a wall, then there will be a Uni-Strut frame with Flexi feet will be used to raise the GRP off of the ground. 6. A detailed visual inspection which shall include: 6.1 The Monitoring equipment will require voltage reference connections (one per phase and neutral), a 230 volt single phase power supply (below 2 amperes) including a suitable earth connection and current measuring Rogowski coils or transducers. The power supply and voltage reference connections may be combined, subject to the monitoring device manufacturer s instructions. In addition to the requirements detailed in section 2 (management of safety) and 3 (general requirements for installation) the following will be carried out: Page 5 of 33

21 6.2 A detailed visual inspection which shall include: All parts of the LV pillar including checks for damage to insulation, overheating (present and historic) and missing phase barriers. Cables and connection methods, this shall include the inspection of all cable cores to identify any damage/ breakdown of insulation and overheating issues. Inspection of abnormal connections i.e. aux LV connections not as manufacturer intended. 6.3 Where an unsafe situation is identified all work on site will cease and appropriate repairs will be instigated. No monitoring equipment will be installed until repairs have been completed and any unsafe situation has been rectified. 6.4 Wherever possible monitoring equipment will be fixed in its permanent position before installation of the associated connections commences. This is likely to be on a wall for indoor substations or in a suitably rated IP enclosure for outdoor substations. 6.5 Care should be taken to ensure that any equipment installed will not interfere with or prevent the safe operation of any equipment located in the substation. Monitoring equipment will be installed at a location specifically chosen to ensure that damage to the equipment through normal operation is minimised. Page 6 of 33

22 7. Commissioning 7.1 On completion of the installation of monitoring equipment a label will be fitted to the cabinet or pillar. This will state as a minimum: The fact that monitoring equipment has been fitted; The owner of the equipment Contact information in the event of queries (typically department or function name) Specific information that other working parties would reasonably expect to know without contacting the owner. 7.2 Commissioning of the monitoring equipment shall be in accordance with the manufacturer s instructions. 7.3 Commissioning should also be in accordance with SEPD s PR-PS-452 and A Guide To Commissioning documents where the monitoring data is to be transmitted to SEPD s control room environment. 7.4 The installer will ensure that the company network information systems (GIS and PLACAR) are updated appropriately to record the installation of the monitoring equipment and any modifications made to the pillar or cabinet. 7.5 A record shall be kept for all aspects of commissioning Page 7 of 33

23 Appendix A Installation Instructions for Lucy Trifca LV Cabinet The following instructions apply only to cabinets arranged with multiple 630A feeder ways; see appendix (TBA) for cabinets that include 800A MCCBs or 2500A ACBs. On- Site Installation Works (NOT LIVE WORK) Reminder - This is a Live Pillar, appropriate PPE must be worn at all times and only approved insulated tools shall be used Ensure that the monitoring device (data aggregator / remote terminal unit) as supplied by the manufacturer is installed in an enclosure of suitable IP rating for the proposed location (IP55 is required for outdoor locations). If the manufacturer has not supplied a suitable enclosure, the installer will need to provide one. Position of GRP Enclosure To ensure that no trip hazard is introduced the enclosure/ mounting should be placed at a suitable location within the substation. The actual location will be dependant upon the type and size of substation. Wherever possible the GRP should be fitted to a wall within the substation. If this is not feasible then a suitable location should be found so that it can be secured to the floor, in a position that does not impede operational tasks and does not pose a trip hazard. If there is any history of a substation flooding and the device cannot be mounted high enough on a wall, then there will be a Uni-Strut frame with Flexi feet will be used to raise the GRP off of the ground. Page 8 of 33

24 On Site Installation Works (LIVE) Open LV Cabinet and ensure all terminals are shielded by approved insulated sheets including spare fuse ways. Identify the voltage reference point. Remove the LV fuses from the test/ terminal block. These are normally of the screw-in type located in the centre of the test/ terminal block. Page 9 of 33

25 Fuses Route for Voltage Measurement Cables The voltage measurement cables are to be routed from the test/terminal block to the power cable chamber via a designated route. The designated route is beneath the 13A power socket, onto the right hand front edge of the cabinet, and then down this front edge to the vermin guard. Plastic trunking (no wider than 15mm) is to be stuck onto this front edge over its full length (Appendix G). The vermin guard is to be unbolted and removed (two bolts); it can then be cut or drilled away from the cabinet, to create a hole in line with the bottom of the trunking, and then reinstalled. This will allow the cables to emerge into power cable chamber. Page 10 of 33

26 Horizontal cross section of cabinet Fuse Way Fuse Way Fuse Way Fuse Way Trunking not to interfere with fuses Trunking to be glued to cabinet Cabinet Door Lip of Cabinet Not to Scale Page 11 of 33

27 Reminder - This is a Live Pillar, appropriate PPE must be worm at all times and only approved insulated tools shall be used Access to Power Cable Chamber Remove the cable chamber inspection plate and close the cabinet door. Page 12 of 33

28 Current Coil Connection Reminder - This is a Live Pillar, appropriate PPE must be worn at all times and only approved insulated tools shall be used There is no set arrangement for connection of current coils and therefore great caution should be taken when installing these cables. Install 3 (or 4 if required) current coils per cable (1 per phase (and neutral if required)). Route for Current Measurement and Voltage Measurement Cables from the Power Cable Chamber All measurement cables are to be routed out of the power cable chamber through the lower vermin guard. This should be unbolted, removed, cut away from the cabinet and replaced with the cables inserted in the cut out section. Note that the cut out should be no larger than the area required for the cables to avoid compromising the integrity of the vermin guard. All cables should be installed in suitable plastic conduit between the cabinet and the monitoring device, and routed away from the areas where access is required for the replacement of power fuses or HV switching. Where possible, the conduit should be hand dug in to run beneath the shingle so that there is no surface trip hazard. Measurement cables should have identification tags fitted at each end so that any subsequent equipment disconnections and reconnections can be established with confidence and a minimum of recommissioning activities. Install 4 (3phase + 1Neutral) of double insulated 2.5mm single core conductors from voltage reference terminals (bus bar side) through to the power cable chamber. Page 13 of 33

29 Current Coil Connection There is no set arrangement for connection of current coils and therefore great caution should be taken when installing these cables. Install current coils round cables (1 per phase (and neutral if required)). Special Instructions for Ground Mounted Cabinets In some situations the cabinet may be placed directly over a concrete trench where there would be no access for the measurement cables through the bottom vermin guard. Where this is the case, it will be necessary to form a hole on the side panel of the cable chamber. In this case, mark the centre point for the 60mm steel hole punch ensuring the hole will not conflict with the auxiliary power terminals and will leave enough space for shielding the installed cables. Note the supplies to the auxiliary terminal block were isolated by removing the fuses located behind the maximum demand indicator assembly. Page 14 of 33

30 Install paxolin shielding to protect cables from risk of pilot drill on penetration. This will be a 2 man task, the shielding must be held in place by a suitably authorised operative. Carefully drill the pilot hole (from inside the cabinet if possible) ensuring there is a second person watching the pilot drill for any error in judgement. Once pilot drilled set up the punch and form the hole to suit the proposed duct gland. All bare metal surfaces are to be treated with a zinc rich aerosol spray (e.g. Galv Cote, SEPD Commodity Code ). Install the duct gland. Page 15 of 33

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32 Completion Terminate all measurement Cables in the monitoring device terminal block. Configure the monitoring device in accordance with the manufacturer s instructions prior to energising. To energise the monitoring device, reinsert the fuses at the cabinet test terminal block. Refer to Section 7 of the procedure with regard to overall commissioning and labelling requirements. Page 17 of 33

33 Appendix B Generic Instruction for Open LV Fuse Boards (Indoor) and Freestanding Mrtal Clad Fuse Pillars (Outdoor) General Requirements This appendix details the equipment and practices to be adopted whilst installing monitoring equipment in the above equipment types. Freestanding Pillars Following inspection the pillar can be prepared for the installation of monitoring equipment and connections. Where the pillar is mounted on a soft grounding (soil, shingle, grass etc.) a hand dug excavation shall be carried out in order to provide an access route for the monitoring cables and power supply connections. Wherever possible these should exit beneath the right hand side of the pillar, however if this is not possible a left hand exit may be used. Where the pillar is mounted on a hard standing or secured within a concrete base then it may be necessary to establish a route beneath the pillar into the surrounding brickwork or concrete in order for the cables to be installed. Before any hole forming is undertaken beneath the pillar all conductors shall be shielded by means of insulating material (approved shrouding). Under no circumstances shall any attempt be made to drill holes in the cast iron panels of the pillar. All monitoring cables (voltage reference, power supply, current measuring etc.) exiting the LV pillar will be protected using suitable flexible ducting or conduits or other similar materials (Appendix G). Page 18 of 33

34 It is important that the cable access route shall be installed at a practical position, however it must not obstruct or affect the operation of doors or interfere with the general operational requirements of the pillar and its function. Reminder - This is a Live Pillar, appropriate PPE must be worm at all times and only approved insulated tools shall be used Open LV Fuse Boards Following inspection, the pillar can be prepared for the installation of monitoring equipment and connections. Generally access to open fuse boards for the connection of monitoring equipment will be straightforward. Care must be taken to ensure that installation of monitoring equipment and associated connections does not introduce additional hazards or interfere with the general operational requirements of the fuse board and its function. Installation of Power Supply and Voltage Reference Connections Voltage reference points and power supplies will be installed using only the equipment and materials detailed in this Appendix. A voltage connection kit will comprise of the following components: Insulated G-Clamps - specially designed, have a minimum metallic content are manufactured from nylon with high insulating properties in order to minimise electrical flashover. Cable connections made using fully shrouded 4mm recessed connections in order to remove the possibility of accidental contact with other metallic surfaces when the plug is inserted into the insulated G-Clamp. Page 19 of 33

35 Fused phase leads - double insulated to provide adequate levels of safety, fused as close as reasonably practicable to the connector. Leads are identified L1, L3, L3 or coloured using standard phase colour (brown, black, grey). Neutral leads - double insulated to provide adequate levels of safety, not fused. Leads are identified N or coloured blue. Earth leads - double insulated to provide adequate levels of safety, not fused. Leads are identified E or coloured green/ yellow. Insulated IP55 terminal enclosure incorporating 4no of Voltage ref terminals, 2no of 230v local supply terminals, 1no of CPC Earth Terminal (may be incorporated into monitoring device). PVC Spiral cable wrap for securing / looming all above cables/conductors. Cable tie wraps. Reminder - This is a Live Pillar, appropriate PPE must be worm at all times and only approved insulated tools shall be used Page 20 of 33

36 Power Supply and Voltage Reference Connections In order to ensure equipment is earthed prior to any live connections being installed, the power supply including the earth connection will always be installed first. Upon satisfactory establishment of the cable access route the pillar can be prepared for installation of a suitable 230 volt single phase power supply. This can be installed as follows. Open the link isolators within the Din Rail terminal block in the monitoring device and make off the remote ends of all leads at the monitoring device. Only then can the cables be connected to the busbars in the pillar. Identify locations within the LV pillar/ fuseboard where the phase, neutral and earth connections will be made off using insulated G-Clamps. The preferred connection point is the expansion / bus bar extension bushings which in most cases are located at the right hand side of the pillar/ fuseboard. Should this point not be available, the insulated G-Clamps can be installed at any other identified suitable busbar location (where the installation does not restrict or interfere with normal operation of the equipment). In all cases the connection shall be made to busbars or the busbar side of any conductors / contact chosen (not on the outgoing side of feeder s i.e. fuse carrier pins/ contacts of outgoing circuits etc.). The conducting material at all connection point locations shall be prepared by scratching the oxidized covering from the conductor using a fully insulated tool (normally a screwdriver) in order to ensure a sound electrical connection. Page 21 of 33

37 The LV pillar/ fuseboard may be prepared for the installation of Main Earthing Connection as follows; The main earth termination shall be made using an insulated G-Clamp. The G-Clamp will be connected to main earth conductor/ bar which is normally located at the bottom of the pillar/ fuseboard. The surface of the earth bar will be prepared using an insulated tool as described above. The G-Clamp shall be positioned on the earth bar to avoid direct interference with existing lugs/nuts/bolts and hand tightened approximately one full turn from point of contact. Note do not use any tool to tighten the G-Clamp. Page 22 of 33

38 Reminder - This is a Live Pillar, appropriate PPE must be worm at all times and only approved insulated tools shall be used Insulated G-Clamps can now be installed for the power supply phase and neutral connection. G-Clamps shall be positioned on neutral and chosen phase busbar to avoid direct interference with existing lugs/nuts/bolts and hand tightened approximately one full turn from point of contact. Note do not use any tool to tighten the G-Clamp. Run the power supply leads into the LV pillar / fuseboard using the access created as detailed above, ensuring that all leads are installed in a tidy manor so as not to interfere with the normal operation of the equipment. Where necessary cable ties and suitable flexible conduits should be used to ensure a tidy installation is achieved. The installation of the power supply can be completed by connecting the leads via the insulated connectors to the G-Clamps. The leads shall be installed in the following sequence; earth, neutral, phase. This process is to be repeated for each of the remaining voltage reference leads. Alternatively where appropriate a power supply and voltage reference can be obtained from the local substation wiring in strict compliance with BS6761. Page 23 of 33

39 Installation of Current Sensors (Rogowski Coils and Transducers) Reminder - This is a Live Pillar, appropriate PPE must be worm at all times and only approved insulated tools shall be used Upon the completion of voltage monitoring connections the pillar can be prepared for installation of the current sensing coils as follows: Highlight the cables and conductors that require to be monitored as per the written work instruction. Starting with the rear conductor, or the furthest from the front of the pillar install and secure the coil / transducer in position making sure that the arrows on the coil are pointing in the direction that the load is flowing as per the manufacturers instructions. Install the remaining coils / transducers working from the back towards the front. Once installed, position all coil / transducer cables in their final location in line with manufactures instructions. Run all cables through per-prepared cable access route / duct and terminate within the monitoring equipment. Page 24 of 33

40 Completion Ensure that the monitoring device (and terminal connection unit if also fitted) is permanently fixed in its final location and that all cables are secured along the length by means of cable ties (inside the pillar) and flexible conduit (outside the pillar) with identification tags fitted to all cables. Ensure that all connections at the monitoring device, terminal connection unit and busbar connectors are secure. Refer to Section 7 of the procedure with regard to overall commissioning and labelling requirements. Page 25 of 33

41 Appendix C Generic Instruction LV fuse boards, cabinets and pillars containing supplies to customers fed via single or bunched wavecon cables with or without source circuit breakers (800A MCCB/ 2500A ACB) or fuses. To be completed. Page 26 of 33

42 Appendix D Generic Instruction Pole Mounted Transformers To be completed. Page 27 of 33

43 Appendix E Drummond G Clamp Specification Page 28 of 33

44 Page 29 of 33

45 Appendix F Typical Rogowski Coil CT Specification Page 30 of 33

46 Page 31 of 33

47 Appendix G Page 32 of 33

48 Conduit and Conduit Adhesive 1.1 Marshall Trufflex Rigid Conduit PVC Trunking Solvent Adhesive 1.2 Marshall Trufflex Trunking Self Fixing 25 x 16MM or 16 x 10MM Page 33 of 33

49 SSEPD Low Carbon Networks Fund Tier 1 Project Close-Down Report SSET1002 Demonstrating the benefits of monitoring LV network with embedded PV panels and EV charging point Appendix III Mapping Table for DNP3 Communications Southern Electric Power Distribution 2013

50 DNP3 RTU ALLOCATION SCHEDULES SSE Power Distribution LOW VOLTAGE S/S MONITORING Low Voltage S/S Monitoring DNP3 Point Schedule SUBSTATION DETAILS Substation Name Worlds End Hill S/S Primary S/S Easthampstead S/S Feeder E8L5 S/S Number Device Number D1 DGCM DEVICE DETAILS DNP3 Address Device IP Address Wireless IP address Vodafone APN 172.xxx.xxx.xxx rtnapn1.sse.com ENMAC HOST DETAILS ENMAC DNP Address 99 ENMAC Host IP Address ENMAC Host IP Address Notes :- UNCONTROLLED COPY MASTER HELD ELECTRONICALLY OFF SITE ntvv 04/12/2012 LV_SS_Monitoring_Whitebook_Master_rev3.1.xls

51 DNP3 RTU ALLOCATION SCHEDULES SSE Power Distribution LOW VOLTAGE S/S MONITORING INTENTIANALLY LEFT BLANK 04/12/2012 LV_SS_Monitoring_Whitebook_Master_rev3.1.xls