CONSULTATION PAPER FOR PROPOSED MODIFICATIONS TO THE TRANSMISSION CODE
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1 CONSULTATION PAPER FOR PROPOSED MODIFICATIONS TO THE TRANSMISSION CODE Closing date for submission of representations: 30 th Sep 2014, 5 pm 18 AUG 2014 ENERGY MARKET AUTHORITY 991G Alexandra Road #01-29 Singapore Please direct any enquiries by to: EMA_ER@ema.gov.sg
2 Disclaimer: The information in this Consultation Paper is not to be treated by any person as any kind of advice. The Energy Market Authority shall not be liable for any damage or loss suffered as a result of the use of or reliance on the information given in this Consultation Paper.
3 1 Introduction 1.1. The Transmission Code sets out the rights and obligations of the Transmission Licensee, together with the rights and obligations of users of the Transmission System. The Transmission Code also sets out the technical requirements to be met by those who seek to connect and operate installations on the Transmission System. 2 Proposed modifications to the Transmission Code 2.1. Pursuant to Section 1.6 of the Transmission Code, EMA seeks representations on the proposed modifications to the Transmission Code as set out in Appendix The proposed modifications are to provide clarity and updates to the technical requirements of the Transmission Code, which among other things include requirements relating to generating units, solar photovoltaic installations, data and voice communications and cable damage preventive measures. 3 Invitation to submit representations 3.1. EMA invites written representations on the proposed modifications to the Transmission Code as set out in Appendix Please send your written representations by to: EMA_ER@ema.gov.sg Alternatively, you may send your written representations by post/fax to the following address: Electricity Regulation Branch Regulation Division Energy Market Authority 991G Alexandra Road, #01-29 Singapore Fax: (65) Please use the form set out in Appendix 2 for your representations Anonymous representations will not be considered All representations must be in writing and must reach EMA by 5 pm on 30 th Sep EMA will acknowledge receipt of all submitted representations electronically. Please contact Mr Yeo Eng Houw at or Mr Vincent Siow at
4 if you have not received an acknowledgement of your submitted representation within two business days EMA reserves the right to make public all or any part of any representation and/or to disclose the identity of the party who made the representation. Where a respondent considers any part of his representation to be confidential, he shall clearly mark and place such part of his representation as an annex This Consultation Paper shall constitute notice of the proposed modifications to the Transmission Code set out in Appendix 1, for the purpose of Section 1.6 of the Transmission Code. ~ End ~
5 Appendix 1 Table 1: Proposed Modifications to the Transmission Code Modification TC/2014/ The generating unit s step-up transformers and generating unit s switchboard (or switchgear) for connecting the high voltage side of the generating unit s step-up transformers and the associated switching and protection/control equipment shall be designed such that no single failure/outage shall cause simultaneous outage of two or more generating units connected to the switchboard. All switchboards shall be designed with oneand-half breakers configuration, unless the Generation Licensees submit with justifications the use of a different switchboard configuration for the Power System Operator s consideration. The generating unit s step-up transformers and generating unit s switchboard (or switchgear) for connecting the high voltage side of the generating unit s step-up transformers and the associated switching and protection/control equipment shall be designed such that no single failure/outage shall cause simultaneous outage of two or more generating units connected to the switchboard. All switchboards shall be designed in accordance to Appendix I1.4 with oneand-half breakers configuration, unless the Generation Licensees submit with justifications the use of a different switchboard configuration for the Power System Operator s consideration. To align with the current Code requirements as set forth in Appendix I1.4. TC/2014/ (b) All generating units shall be designed such that: the generating station has Black Start Capability unless exempted by Power System Operator; All generating units shall be designed such that: each generating station with any generating unit(s) of rated capacity 100MW and above is required to have Black Start Capability the generating station has Black Start Capability unless exempted by Power System Operator; To exempt generating stations with generating unit(s) of rated capacity below 100MW from the requirement to have Black Start Capability as such generating stations have limited capability to energize the network during a black start condition.
6 TC/2014/ The Transmission Licensee and Generation Licensee shall provide all the equipment at their respective site, including the communication equipment. The Transmission Licensee shall provide data communication lines from the control centers of the Power System Operator to the transmission substation and power station switchhouses as specified by the Power System Operator for the purposes of real-time power system monitoring and control. All the equipment at the site shall be equipped with battery backup of at least 4-hour operation time. In addition, the AC power shall also be backed up by the standby generator at the site, if the site is equipped with such a facility. The Transmission Licensee and Generation Licensee shall provide all the equipment at their respective site, including the communication equipment. The Transmission Licensee shall provide data communication lines from the computer room in the control centers of the Power System Operator to the transmission substation and power station generating station switchhouses as specified by the Power System Operator for the purposes of real-time power system monitoring and control. The Generation Licensee shall be responsible for the data communication lines from the Generation Licensee s equipment to a termination box located in the generating station s switchhouse. The termination box, which shall be provided by the Transmission Licensee, shall also be used for termination of the Transmission Licensee s data communication lines. In the event of relocation of the termination box or diversion of the data communications lines, the Licensee that initiates the relocation or diversion shall bear all the costs necessary for the relocation or diversion including the costs incurred by any other affected Licensee to divert the data communication lines at the affected Licensee s end caused by the relocation or diversion. All the equipment at the site shall be equipped with battery backup of at least 4-hour operation time. In addition, the AC power shall also be backed up by the standby generator at the site, if the site is equipped with such a facility. To provide clarity on the line of responsibility for the communication lines between the Transmission Licensee and the Generation Licensee.
7 TC/2014/ (new) New Clause Owners of solar photovoltaic installations with an installed capacity of 100 kwac or above at each site/facility shall provide the Power System Operator with the following signals sample transmitted at 1 minute intervals. Detailed requirement shall be provided by the Power System Operator upon request. Active Power at the point of connection to the grid (i.e. the service connection); and Active Power (gross) at the AC-side of the solar photovoltaic installation. To facilitate the monitoring of power output from solar photovoltaic installations with an installed capacity of 100kWac or above, and ensure that there is sufficient reserve capacity available in the system to respond to sudden fluctuations in solar PV output so as to maintain power system security and reliability. TC/2014/ New Clause The Generation Licensee shall ensure that its generation facilities and generating station premises have adequate protection and preventive measures against lightning strike and fire and comply with the requirements of IEC, BS, SS, or other equivalent international standards. To ensure that generation facilities and generating station premises are protected against fire and lightning strikes which affect the operation of generating units. This is to ensure the reliability and availability of generating units so as to maintain power system security and reliability. TC/2014/6 9.4 New Section 9.4 Cable Damage Preventive Measures The Generation Licensee shall implement measures to ensure that electricity cables belonging to the Transmission Licensee, which are laid in the generating station premises, are protected from damage by any earthworks carried out in the premises, including but not limited to the following: To ensure that Transmission Licensee s electricity cables in generating station premises are protected from damage by earthworks so as to ensure power system security and reliability.
8 (a) providing clear markings of 400kV, 230kV and 66kV cables routes within the generating station premises; (b) establishing a standard operating procedure ( SOP ) for earthworks carried out within generating station premises in compliance with the cable damage prevention provisions in the Electricity Act; and (c) implementing, as part of the SOP, a Permitto-Work ( PTW ) system to ensure that contractors seek the Generation Licensee s approval before they commence earthworks The Transmission Licensee shall keep up-to-date digital mapping or records of their high voltage cables installed in and under public places in such form as is accessible by other utilities service providers or such other persons who require such information for locating the high voltage cables prior to commencement of earthworks. TC/2014/7 C1.3 (d) C1.3 Generating unit performance parameters (d) Generating unit step-up transformer Rated MVA Capacity MVA Rated voltage C1.3 Generating unit performance parameters (d) Generating unit step-up transformer Rated MVA Capacity MVA Rated voltage Primary kv The requested information is required for a connection applicant to demonstrate to the Transmission Licensee and the Power System Operator that the applicant s proposed installation meets the Transmission Code requirements.
9 Primary kv Secondary kv Nominal voltage ratio, primary/secondary Positive sequence impedance at Maximum tap % Minimum tap % Nominal tap % Zero phase sequence impedance % Tap changer range + % - % Tap changer step size % Tap changer type on load / off load Winding connection and Vector Group Magnetising curve Earthing resistor of transformer (if any) At Primary side At Secondary side Secondary kv Nominal voltage ratio, primary/secondary Positive sequence impedance at Maximum tap % Minimum tap % Nominal tap % Zero phase sequence impedance % Tap changer range + % - % Tap changer step size % Tap changer type on load / off load Winding connection and Vector Group Magnetising curve Earthing resistor of transformer (if any) At Primary side At Secondary side Report on predicted transformer energisation performance including electromagnetic transient studies and detailed model in PSCAD
10 TC/2014/8 C1.3 (h) Generating unit performance parameters (h) Gas Turbine Units (Open Cycle and Closed Cycle) Rated MW Capacity Performance data and curves: Power vs. Fuel Consumption Exhaust Temperature vs. Fuel Consumption Power vs. Ambient Temperature Power vs. Speed Inlet Guide Vane effects Control design Functional description and block diagram showing transfer function of individual element of gas turbines units (including effect of Ambient Temperature) in PSSE format Test data/report: Load rejection tests Frequency response tests Generating unit performance parameters (h) Gas Turbine Units (Open Cycle and Closed Cycle) Rated MW Capacity Performance data and curves: Power vs. Fuel Consumption Exhaust Temperature vs. Fuel Consumption Power vs. Ambient Temperature Power vs. Speed Inlet Guide Vane effects Control design Functional description and block diagram showing transfer function of individual element of gas turbines units (including effect of Ambient Temperature). The model is to be submitted in both PSSE source code (i.e. flecs code) format and MATLAB Simulink format. Test data/report: Load rejection tests Frequency response tests To provide clarity on the format of the information to be provided, which shall apply to all new or repowered generating units.
11 TC/2014/9 C4.1 (j) (j) Power System Stabilizer (PSS) For each generating unit with Rated MW Capacity at or above 60MW, a PSS shall be incorporated to provide additional damping of power oscillations. Proper operation of the PSS shall be confirmed by test. The preferred input signal for the PSS is accelerating power which can be synthesized from measured electrical power and speed. PSS transducers (i.e. for measuring input signals) shall be linear over their operational range and its time constant shall not exceed 100 milliseconds. Power System Operator shall make available the system characteristic to Generation Licensees for tuning of PSS. Generation Licensees shall submit a report incorporating the methodology in deriving the setting of the PSS parameters, as well as the tuning techniques, to PSO for review before implementation on site. (j) Power System Stabilizer (PSS) For each generating unit with Rated MW Capacity at or above 60MW, a PSS shall be incorporated to provide additional damping of power oscillations. Proper operation of the PSS shall be confirmed by test. The preferred input signal for the PSS shall have dual inputs, namely is accelerating power which can be synthesized from measured electrical power and speed. PSS transducers (i.e. for measuring input signals) shall be linear over their operational range and its time constant shall not exceed 100 milliseconds. Power System Operator shall make available the system characteristic to Generation Licensees for tuning of PSS. Generation Licensees shall submit a report incorporating the methodology in deriving the setting of the PSS parameters, as well as the tuning techniques, to PSO for review before implementation on site. To align with the current practice of using dual-input PSS which offers better transient performance than single-input PSS.
12 TC/2014/10 F2.1 F2.1 Voltage Fluctuation (a) Connected person shall ensure that the operation of their installations shall not cause voltage fluctuation at a point of common coupling to exceed 3% of the nominal voltage for step changes. (b) The planning limits for voltage fluctuation caused by connected person, e.g. owner of an arc furnace, shall be in accordance with the requirements set out in Engineering Recommendation P28 of UK. F2.1 Voltage Fluctuation (a) Connected person shall ensure that the operation of their installations shall not cause voltage fluctuation at a point of common coupling to exceed 3% of the nominal voltage for step changes. (a) The Transmission Licensee and connected person shall ensure that the operation of their installations shall not cause voltage fluctuation at a point of common coupling to exceed 3% of the nominal voltage for step changes, with the exception of the energisation of cables, transformers and shunt/series reactors connected to the transmission network, which shall not cause voltage fluctuation at a point of common coupling to exceed 5% of the nominal voltage. (b) The planning limits for voltage fluctuation caused by connected person, e.g. owner of an arc furnace, shall be in accordance with the requirements set out in Engineering Recommendation P28 of UK. To incorporate the limit for voltage fluctuations due to energisation of cables, transformers and shunt/series reactors. The limit is set with reference to IEC/TR :2008. TC/2014/11 F4.3 New The Generation Licensee shall provide compatible voice communication equipment located in the Generation Licensee's generation facility control room which shall be connected to the Transmission Licensee's voice communication system. The Generation Licensee shall be responsible for the communication lines from the Generation Licensee's generation facility control room to the termination box that connects to the Transmission Licensee's voice communication system. The termination box shall be provided by the Transmission Licensee and shall be located in the generating station switchhouse. In the To enhance the resilience of the voice communication system in the power sector.
13 event of relocation of the termination box or diversion of the communications lines, the Licensee that initiates the relocation or diversion shall bear all the costs necessary for the relocation or diversion including the costs incurred by any other affected Licensee to divert the communication lines at the affected Licensee s end caused by the relocation or diversion. TC/2014/12 H2.1(b) An AGC station shall have a dedicated RTU with the condition that the RTU shall not be controlling more than 4 generating units or a total of more than 1000MW. Should the number of generating units or total generating capacity exceed this, then a second RTU shall be provided. An AGC station A generating station shall have a dedicated RTU with the condition that the RTU shall not be controlling more than 4 generating units or a total of more than 1000MW. Should the number of generating units or total generating capacity exceed this, then a second RTU shall be provided. To align with the definition of generating station in the Transmission Code. TC/2014/13 H3.1 Communications between the remote terminal equipment and the EMS shall be through 2-wire telephone line or pilot wire. The equipment shall communicate using V.34 analog lease-line modems or X.27 optical modems. The modems at the EMS will operate as originator while the remote terminal equipment modems will operate as answerer. Communications between the remote terminal equipment located at the Transmission Licensee s substation and/or connected person s intake substation/switchhouse and the EMS shall be through 2-wire telephone line or pilot wire data communication lines provided by the Transmission Licensee. The equipment shall communicate using V.34 analog lease-line modems or X.27 optical modems. The modems at the EMS will operate as originator while the remote terminal equipment modems will operate as answerer. To enhance the security and reliability of the communication system in the electricity network by using independent data communication lines (which are to be provided by the Transmission Licensee) instead of the public communication network (i.e. telephone lines).
14 TC/2014/14 H3.3 It is the responsibility of the Transmission Licensee and Generation Licensee to provide all the equipment at the remote site including the communication equipment and the communication line up to the surge arrestor located at the PSO control centres. It is the responsibility of the Transmission Licensee and Generation Licensee to provide all the equipment at the remote site including the communication equipment and the communication line up to the surge arrestor located at the PSO control centres. The communication equipment shall include encryption devices to ensure secure communication on the communication lines. These encryption devices shall be of the same make and model as the devices installed at the PSO control centres. To align with the current practice of deploying encryption devices in communication lines so as to protect against cyber-security and ensure power system security and reliability. TC/2014/15 H4.1 Substation and Switchhouse The following measurements shall be provided: (f) Transformer taps (with the exception of 66/22 kv transformers); and (g) Solar global irradiance (applicable only to Transmission Licensee s substations); and (h) Other quantities, as required. To facilitate the collation and monitoring of solar photovoltaic weather data for the planning and enhancement (if required) of the electricity network to ensure the grid readiness to support greater deployment of solar photovoltaic systems. TC/2014/16 H4.2 AGC Station AGC Station Generating station Consequential change to align with the proposed change in Appendix H2.1 (b) above.
15 TC/2014/17 H4.2 (d) The status of the following equipment shall be provided: New The status of the following equipment shall be provided: (d) Status of frequency response switch To align with the current practice of monitoring the status of frequency response switch. TC/2014/18 H4.2 (e) Renumber from existing H4.2 (d) H4.2 (d) Emergency Shutdown Valve (ESDV) and the status of all valves on the Onshore Receiving Facility (ORF) and natural gas transmission pipeline supplying natural gas to the generation facility. H4.2 (d) (e) Emergency Shutdown Valve (ESDV) and the status of all valves on the Onshore Receiving Facility (ORF) and natural gas transmission pipeline supplying natural gas to the generation facility. Consequential change due to the proposed change to Appendix H4.2 (d) above. TC/2014/19 H4.2 (f) Renumber from existing H4.2 (e) H4.2 (e) Pressure and gas flow at ORF and natural gas transmission pipeline supplying natural gas to the generation facility. H4.2 (e) (f) Pressure and gas flow at ORF and natural gas transmission pipeline supplying natural gas to the generation facility. Consequential change due to the proposed change to Appendix H4.2 (d) above. TC/2014/20 H4.2 (g) New H4.2 (g) For a combined-cycle plant or gas turbine, the ambient temperature and the hot switch activation signal when fuel changeover is initiated, manually or automatically, from natural gas to its alternate fuel and the fuel type used. To align with the current practice of monitoring the ambient temperature and hotswitch activation signal for all combinedcycle plants and gas turbines.
16 TC/2014/21 H4.2 (h) Renumber from existing H4.2 (f) H4.2 (f) Other quantities, as required. H4.2(f) (h) Other quantities, as required Consequential change due to the proposed change to Appendix H4.2 (d) above. TC/2014/22 H6 (i) New Status and measurements sent to the EMS shall be flagged as not topical by the RTU whenever there is a failure in the instrument or system providing the status or measurements to the RTU. To align with the current practice of flagging status and measurements as not topical when there is a failure in the instrument or system providing the status or measurements to the RTU. TC/2014/23 H8 (d) Compliance table with the IEC Interoperability List (Appendix H10) Compliance table with the IEC Interoperability List (Appendix H10) as stated in the System Operation Manual. Detailed information on interoperability is described in the System Operation Manual. TC/2014/24 H8 (e) IEC Protocol Information Object Address Assignments (Appendix H11) IEC Protocol Information Object Address Assignments (Appendix H11) as stated in the System Operation Manual. Detailed information on protocol information object address assignments is described in the System Operation Manual.
17 TC/2014/25 H10 IEC Interoperability List IEC Interoperability List Appendix H10 is no longer needed as detailed information on interoperability is described in the System Operation Manual. TC/2014/26 H11 IEC Protocol Information Object Address Assignments IEC Protocol Information Object Address Assignments Appendix H11 is no longer needed as information on protocol information object address assignments is described in the System Operation Manual. TC/2014/27 Appendix I2 See details in Table 2 below See details in Table 2 below To update the standards for switchgears, transformers and cables.
18 Table 2: Updates to Switchgear, Transformers and Cable Standards Clause Items Original Standard Updated Standard Switchgear IEC IEC IEC IEC IEC IEC Circuit Breakers IEC BS 5311 IEC BS 5311 BS EN AC Disconnectors (Isolators) IEC BS 5253 IEC BS 5253 BS EN Appendix I2.1: Switchgear Current Transformers Voltage Transformers IEC BS 7626 BS 3938 SS318 IEC IEC BS 7625 BS 3941 IEC IEC BS 7626 BS EN BS 3938 SS318 IEC IEC IEC BS 7625 BS EN BS 3941 Instrument Transformers IEC IEC IEC IEC Bushing Relays IEC BS 223 IEC BS 5992 IEC BS 223 BS EN IEC BS 5992 BS EN BS EN
19 Clause Items Original Standard Updated Standard Instruments BS 89 Earthing Motors Control Gear Wires and Wiring IEC CP 1013 SS CP 16 BS 2613 BS 5000 Part II BS 3979 IEC IEC BS 5424 Part I IEC Part I BS 6231 BS 89 BS EN IEC CP 1013 BS 7430 SS CP 16 SS 551 BS 2613 BS 5000 Part II BS EN BS 3979 IEC IEC IEC IEC BS 5424 Part I BS EN IEC Part 1 IEC IEC BS 6231 Inductive Load Switching IEC IEC IEC Sulphur Hexafluoride (SF6) IEC BS 5207 BS 5209 IEC BS 5207 BS EN BS 5209 BS EN High Voltage Test Techniques IEC BS 923 IEC IEC BS 923 BS EN Cable Connections IEC IEC IEC
20 Clause Items Original Standard Updated Standard Enclosures IEC IEC CENELEC EN CENELEC EN CENELEC EN CENELEC EN IEC IEC IEC CENELEC EN CENELEC EN CENELEC EN CENELEC EN Sound Level Meter IEC IEC IEC Transformers Power Transformers IEC IEC IEC SS 404 IEC BS 171 IEC IEC IEC SS 404 IEC BS 171 Appendix I2.2: Transformers Transformer Oil BS 148 BS 5730 BS 148 BS 5730 BS EN Tap Changers BS 4571 BS 4571 BS EN High Voltage Test Technique Precision Sound Level Meters IEC BS 923 IEC BS 923 BS EN IEC IEC IEC Earthing SS CP16 SS CP16 SS 551 Motor BS 2613 BS 2613 BS EN High Voltage Bushing BS 223 BS 223 BS EN 60137
21 Clause Items Original Standard Updated Standard Current Transformers BS 7626 BS 3938 SS 318 BS 7626 BS 3938 BS EN SS 318 IEC Appendix I2.3: Cables XLPE insulation power cables for rated voltages of up to 600/1000V Tests for power cables with extruded insulation SS 324 IEC IEC SS 324 SS 443 IEC IEC IEC IEC Cable Connections IEC IEC IEC
22 Appendix 2 Representations on the Proposed Modifications to the Transmission Code Name: Designation: Company: Role (Generation Licensee/ Retailer/ Consumer): Submission Date: (dd/mm/yy) Modification Section Comments Reference to the section of the Transmission Code where change has been made in the version dated on January 2014 as published on the EMA website.
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