High voltage products. Fiber Optics Current Sensor- Free Standing (FOCS-FS) Enabling smart grids and digital substations

Transcription

1 High voltage products Fiber Optics Current Sensor- Free Standing (FOCS-FS) Enabling smart grids and digital substations

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3 ABB - a global technology leader ABB is a global leader in power and automation technologies that enable utility and industry customers to improve performance while lowering environmental impact. The ABB Group of companies operate in around 100 countries. ABB has been producing instrument transformers for more than 70 years. Their main applications include revenue metering, control, indication and relay protection. All instrument transformers supplied by ABB are tailormade to meet the needs of our customers. Background Current measurement is one of the key functions in the control and protection of electric power grids. Enabling digital substations and smart grids ABB s newly developed product family of Fiber Optics Current Sensor- Free Standing (FOCS-FS) offers significant improvements over conventional CTs and facilitates direct introduction of digital process bus in HV substations. This new design exceeds magnetic CT technology in safety of operation, current measurement and frequency response, footprint/weight savings and environmental friendliness. The fast response of FOCS and precise measurement of both ac and transient dc results in improved substation protection and monitoring functions. The digital interface of FOCS-FS is designed for IEC LE communication for integration into digital substation automation systems. Conventional current transformers use the principle of electro-magnetic induction to generate a small secondary current, typically 1 A or 5 A at rated primary current, which then serves as an input for protection relays or energy meters. Such transformers have been commonly seen for many decades now and can operate reliably under the harsh conditions in an outdoor substation. ABB, the leading power and automation technology group, has also developed since 1990s non-conventional current sensors, based on the Faraday effect principle, whereby light is used to deduce the precise magnitude of current that is creating the magnetic field. The latest generation of fiber optic current sensors has been adopted in the free-standing application, to cover the demand for non-conventional current transformers having digital output and suitable for current measurement applications in 245 kv to 800 kv substations. Product brochure FOCS-FS 3

4 Product overview Designed for digital substations ABB s latest innovations, the FOCS-FS is a free-standing sensor system for 245 kv to 800 kv high voltage substations, and is designed as a redundant 3-phase sensor (Fig. 1) consisting of two optoelectronic (OE) modules, three sensor heads, and the fiber cables in between. The OE module houses the opto-electronics to interrogate the fiber coils (3 phases). Each sensor head contains two fiber coils in order to enable redundancy on the system level. Fiber connectors at the opto-electronic modules facilitate the installation as there is no need for fiber splicing in the field. The two fiber leads to the coils are protected in a special cable placed inside the hollow insulator volume that is filled with nitrogen. The cable runs to ground through the gas volume and leaves the insulator pole through a gastight feed-through. The optoelectronic modules are mounted in a cubicle attached to the support frame of one of the three insulator poles (Fig. 2). Fig. 1 Three-phase FOCS kit (redundant) The opto-electronic module performs the following tasks (Fig. 3): sends polarized light to the sensor coil receives the reflecting polarized light from the sensor coil compares in close-loop control the phase displacement in the polarized light in proportion to the magnetic field and the primary current converts the result into an optical IEC Ethernet output. The opto-electronic module sends the optical output through a standard Ethernet cable to secondary equipment like protection relays or to SAM600 stand-alone merging units. The secondary equipment, manufactured by ABB or other vendors, needs to comply with IEC LE, a protocol widely used for smart grid and digital substation application. Fig. 2 Three-phase FOCS-FS installation setup Optoelectronics module y x Orthogonal linearly polarized light waves Light source Photo diode Polarized Signal processor out Modulator Fiber cable Φ Fiber cable Polarization converter Fiber coil Current conductor Left and right circular light waves different speeds in magnetic field Fig. 3 Operating Principle of Optical Current Sensor 4 FOCS-FS Product brochure

5 Product features Customer benefits Enabling smart grids and digital substations: Digital interface, designed for IEC LE communication for integration into digital substation automation systems. Plug & Play solution: Fully redundant system with hot swappable opto-electronics. Accurate: Meets key modern performance requirements for accuracy, in a wide temperature range. The design is inherently free of magnetic saturation, therefore suitable for capturing fast transient currents, short circuit currents, and alternating current (AC) with DC-offset. Reduced substation footprint: The compact design requires less space compared to traditional instrument transformers. Eco-efficient: Using no oil or SF 6 gas FOCS is an ecoefficient solution. Reliable: Simple and robust design with self-diagnosis and alarm functions; different levels of redundancy available on request. Safe: As providing a low voltage digital output and filled with nitrogen gas at ambient pressure, FOCS has zero risk of electrocution and explosion. Compatible: Suitable for conventional Air Insulated Substation layouts. The adopted IEC LE protocol allows interoperability with other vendors equipment. Simplified engineering: Rated voltage and rated current are the only parameters that need to be specified. As a result, projects have simplified system engineering and are delivered faster. Additionally, the impact of late changes in specifications is negligible. Easy to install: FOCS is light-weight, compact and flexible with reduced installation costs. Deployment of fiber cables in the substation does not require splicing with dedicated fiber-optic equipment. The outdoor placement of the optoelectronics modules near the insulators reduces the length of sensor fiber cables to a minimum. Design details Head: The same aluminum casting design covers all voltage ratings and all currents ratings. The design allows the installation of a second optical sensor head, in order to have an extended redundancy level for the system. Primary terminals: Interchangeable, as per customer specifications and applicable Standards. Possibility to have contactless application (no HV primary terminals). Contacts are aluminum cased and present two passthrough holes that allow periodical calibration (if requested) without necessity to disconnect the main contacts. Insulator: The design is based on hollow insulator technology. The whole product family utilizes the insulators of the same diameter. Basement: An aluminum casting basement is designed for the whole family products ( kv). Optical fibers are winded and segregated in the basement during transport and erection. FOCS sensor head and primary terminals FOCS free standing base and optical fiber exit Product brochure FOCS-FS 5

6 Ratings and technical details Parameters [unit] FOCS-FS 245 FOCS-FS 420 FOCS-FS 550 FOCS-FS 800 System Voltage Rated frequency [Hz] 50 / 60 Highest voltage for equipment [kv r.m.s. ] Rated power-frequency withstand voltage [60 s] Rated lightning impulse withstand voltage [1,2/50 µs] Rated switching impulse withstand voltage [250/2500 µs] Current ratings [kv r.m.s. ] [kv peak ] [kv peak ] N/A Rated primary current [A] Rated continuous thermal current [A] Rated short circuit current (1 s) [ka] 63 (1 s) 40 (3 s) Rated dynamic current [ka] 164 Insulator Material N/A composite - grey Min nominal specific creepage distance mm/kv 31 (Pollution level 4 - Very Heavy) Static withstand loads N Class II: 4000 Class II: 5000 as per customer specifications Insulation fluid N/A N 2 Filling absolute pressure MPa ambient pressure Accuracy Protection accuracy N/A IEC Class 5P, 5TPE IEEE 10% Interfaces Primary terminals N/A As per IEC As per ANSI/NEMA CC Other design available on request Digital output N/A Digital output (IEC LE) Optical ethernet cable: Duplex MM 62.5/125 with ST connector Optical 1PPS cable: Duplex (or Simplex) MM 62.5/125 with ST connector Options Redundancy of electronics N/A Available on request Merging unit for VT signals N/A Available on request Redundancy of power supply N/A Available on request Environmental conditions Outdoor equipment operating temperature (shade) [ C] -40; +45 Air pollution N/A Very Heavy Corrosive environment [ISO ] N/A C3 C5 (Medium Very high) Ice load mm 20 Seismic level g 0,5 Dimensions and weights HV Column height (one phase) [mm] HV Column weight (one phase) [kg] Fixing points on pedestal N/A #4 holes ø22 at 480 x 480 mm Control Cabinet dimensions (width x height x depth) [mm] 800 x 1000 x 300 (non redundant system) 1000 x 1200 x 300 (redundant system) Control Cabinet weight [kg] 120 (non redundant opto-electronics with merging unit) 150 (redundant opto-electronics with merging units) 6 FOCS-FS Product brochure

7 System architecture variants The level of redundancy than can be specified is given by the number of opto-electronics units integrated in the system. Typically protection applications require a single redundant configuration, which consists of two opto-electronic units operating independently and in parallel. Other redundancy levels, for example non redundant (one opto-electronic unit) and double redundant (four opto-electronic units) are available. All solutions can be equipped on request with SAM600 standalone merging units, which digitalize analog signals coming from voltage transformers, synchronize those signals with the digital signal coming from FOCS and consolidate both signals into a digital output stream complying with IEC LE protocol. NR: Not redundant without Merging units FOCS A Control A Optical current transformer Main A Outdoor kiosk Relay house NRM: Not redundant and Merging units FOCS A SAM600 A Control A Optical current transformer Main A Outdoor kiosk Relay house Legend Polarization maintaining (PM)M optical cable (proposed is standard length of 30m, up to 300m possible) Standard multi-mode optical cable for IEC Ethernet and dedicated fiber for 1PPS time synch. Analogue electrical lines Product brochure FOCS-FS 7

8 System architecture variants SR: Single redundancy without Merging units FOCS A FOCS B Control A Control B Optical current transformer Main A Outdoor kiosk Relay house Main B SRM: Single redundancy and Merging units FOCS A SAM600 A FOCS B SAM600 B Control A Control B Optical current transformer Main A Outdoor kiosk Relay house Main B Legend Polarization maintaining (PM)M optical cable (proposed is standard length of 30m, up to 300m possible) Standard multi-mode optical cable for IEC Ethernet and dedicated fiber for 1PPS time synch. Analogue electrical lines 8 FOCS-FS Product brochure

9 DR: Double redundancy without Merging units FOCS A FOCS B Control A Control B FOCS A FOCS B Optical current transformer Main A Outdoor kiosk Relay house DRM: Double redundancy and Merging units FOCS A FOCS B SAM600 A SAM600 B Control A SAM600 A FOCS A SAM600 B FOCS B Control B Optical current transformer Main A Outdoor kiosk Relay house Main B Legend Polarization maintaining (PM)M optical cable (proposed is standard length of 30m, up to 300m possible) Standard multi-mode optical cable for IEC Ethernet and dedicated fiber for 1PPS time synch. Analogue electrical lines Product brochure FOCS-FS 9

10 Applicable standards FOCS-FS current transformers are designed to comply with the following Standards. IEC ( ) IEC ( ) IEC ( ) IEC ( ) IEC ( ) IEEE C57.13 (1993) IEEE C (2005) Electronic current transformers Instrument transformer General requirements Instrument transformer Additional requirements for current transformers Composite hollow insulators Communication networks and systems for power utility automation Standard Requirements for Instrument Transformers Standard for High-Accuracy Instrument Transformers Quality Assurance FOCS-FS current transformers are manufactured in ABB s state-of-the-art facility located in Lodi (Italy). The facility is certified in accordance with the following Standards. ISO 9001:2008 ISO 14001:2004 OHSAS 18001:2007 Quality Management Systems Environment Management Systems Occupational Health and Safety Management Systems 10 FOCS-FS Product brochure

11 Inquiry and order information sheet Customer / project... Rated frequency [Hz] Highest voltage for equipment [kv r.m.s. ] Rated power-frequency [kv r.m.s. for 60 s] withstand voltage Rated Primary current [A] other... Rated extended primary current factor Primary Terminal design... System Achitecture Redundancy not redundant single redundant double redundant Redundancy of power supply not required required Product brochure FOCS-FS 11

12 Contact us ABB S.p.A. Power Products Division Unità Operativa Adda-HV Via dei Ceramisti, snc I Lodi Tel: Fax: Data and illustration without engagement. We reserve the right to make changes in the course of technical development. Copyright 2014 ABB. All rights reserved. 2GJA Rev. -, en FOCS-FS Brochure (mt)