Capacitor Voltage Transformers

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1 Capacitor Voltage Transformers

2 Capacitor Voltage Transformer Introduction Trench is a recognized world leader in the design and manufacture of high voltage equipment for application on electric utility and high energy industrial systems. As part of Trench's product scope, the Company produces a diversified range of Instrument Transformers which are installed on kv electrical systems. Instrument Transformers include: Voltage (Potential) Transformers (both inductive and capacitive type), Current Transformers and Combined Instrument Transformers (voltage and current transformer in one unit). Fig. Type TEVF Capacitor Voltage Transformers Capacitor Voltage Transformers must convert transmission class voltages to standardized low and easily measurable values, which will be used for metering, protection and control of the high voltage system. As such, the need for accurate and reliable voltage transformation is essential. Additionally, Capacitor Voltage Transformers serve as a coupling capacitor for coupling high frequency power line carrier signals to the transmission line. This brochure will detail the features and characteristics Capacitor Voltage Transformers. Please refer to Trench brochure E20 for additional general information concerning high voltage Instrument Transformers and brochure E 2.0 for specific information concerning Coupling Capacitors. 2

3 Features meet all IEC and ANSI metering and protection classes (other standards on request) applications from 69 kv 800 kv Quality Assurance in accordance with ISO 900 capable of carrier coupling PLC signals to the network higher inherent capacitance values provide superior PLC coupling, better transient performance and improved stability optimized insulation system design utilizing state-of-the-art processing techniques with either mineral oil or synthetic insulating fluids stability of capacitance and accuracy over a long period of time due to superior clamping system design oil expansion by way of hermetically sealed stainless steel bellows assures the integrity of the insulation system over time bellows puncture pin provides for release of internal pressure in the event of severe service conditions leading to internal discharges puncture pin operation releases insulating fluid to run down the porcelain, resulting in an oil stain and clear visual indication of a problem extra high strength porcelains provide both superior seismic performance and the ability to mount large line traps directly on the CVT with corresponding savings in installed cost maintenance-free oil filled cast aluminum basebox superior transient response characteristics internal company routine test and quality requirements exceed those of international standards with impulse tests and partial discharge test being performed on a routine basis not subject to ferroresonance oscillations with the network or breaker capacitor passive ferroresonance suppression circuit provides superior damping while not degrading transient response. This allows faster relay operation with less zone overreach concerns high capacitance CVT's, when installed in close proximity to EHV circuit breakers, can provide enhanced circuit breaker short line fault/trv performance Proven Seismic Performance: Trench porcelain housed CVT s have passed the most demanding seismic shaker table tests and have survived real earthquakes in service.

4 Construction Trench CVT's consist of two primary assemblies; the high voltage capacitor sections and the base box housing the electro-magnetic components. Series connected capacitor elements, housed in porcelain shells, each hermetically sealed, are referred to as capacitor sections. The capacitor elements are insulated with a high quality polypropylene film/paper dielectric and impregnated with highly processed synthetic fluid. Each capacitor section is equipped Electrical Performance with a stainless steel expansion chamber which will allow the synthetic fluid to expand and contract with changes in ambient operating temperatures. Should there be excessive pressure build up within a capacitor section, the expansion chamber will engage a puncture pin, resulting in pressure release and visual indication of a problem. It is over these capacitor sections (- capacitor sections per CVT) that most of the high voltage will be dropped. A tap voltage (approximately -2 kv depending on type) is taken from the lowest capacitor section and fed to an electromagnetic circuit in the cast aluminum base box. The base box contains the intermediate transformer which will provide the final output voltages via multiple tapped secondary windings, series compensating reactor and ferroresonance control circuitry. The base box is filled with dried mineral oil, protecting the components from environmental deterioration. Ferroresonance is simply and effectively controlled by utilization of low flux density designed magnetic circuitry and a saturable reactor controlled damping circuit connected across the secondary winding. The ferroresonance suppression circuit does not adversely affect transient response. Characteristics TEVF TEMF TETP TEIRF TEMP TEHMF, TEHMP TEVP TEIMF Accuracy class () 200 VA 200 VA 200 VA 200 VA 00 VA 00 VA ANSI (0.6 class) (0. class) (0.6 class ) (0. class) (0. class) (0. class) Each main winding (2) 0.6 MWXYZ 0. MWXYZ 0.6 MWXYZ 0. MWXYZ 0. MWXYZ and ZZ 0. MWXYZ and ZZ or 0. MWXYZ Auxiliary winding.2y.2y.2y.2y.2y.2y IEC (2) Each main winding cl 0.2, 0 Hz 22 VA 20 VA cl 0.2, 60 Hz 20 VA 00 VA cl 0., 0 Hz 0 VA 20 VA 0 VA 0 VA 00 VA 600 VA cl 0., 60 Hz 200 VA 00 VA 200 VA 00 VA 0 VA 00 VA cl.0, 0 Hz 00 VA 00 VA 00 VA 600 VA 00 VA 000 VA cl.0, 0 Hz 00 VA 600 VA 00 VA 00 VA 00 VA 000 VA Auxiliary winding Class P, 0 VA Class P, 0 VA Class P, 0 VA Class P, 0 VA Class P, 0 VA Class P, 0 VA Transient response Less than % (of crest) residual in burden: ZT ZT ZT ZT ZZT 0% or ZZT 0% 0% 6% % ZT 6% % Ferroresonance suppression () Less than 0% (of crest) in 200 milliseconds at 20% of rated voltage Thermal rating 000 VA 000 VA 000 VA 00 VA 000 VA 00 VA Notes: () Two main windings are supplied as standard, with a third auxiliary winding available as an optional extra. (2) The accuracy class for total simultaneous loading is equal to the values given for each main winding. () Optional designs available having approx. 0 msec damping times.

5 Note: Connection between internal terminals are made at the factory as required for each unit. Series reactor Intermediate voltage transformer Harmonic suppression filter Protective gap Secondary terminal board Faraday shield Fig. Typical schematic diagram of a Capacitor Voltage Transformer Potential ground switch Choke coil and gap assembly Drain coil, gap and carrier ground switch assembly Porcelain Shell Oil Filled Expansion Chamber Capacitor Rolls Oil Filled Basebox Intermediate Transformer Series Reactor Stabilizing Burden Low Voltage Terminal Box Oil Level Side Glass Fig. Sectioned view of a typical Capacitor Voltage Transformer

6 Capacitor Voltage Transformers Electrical and Mechanical Data () Type Maximum continuous Impulse Power frequency Standard operating withstand withstand capacitance voltage.2/0 µs voltage (2) phase to phase (BIL) I min. kv kv pf TEVP, TETP ,800 or ,00 TEMP , , , , , , ,800 TEIMF or TEIRF , , , , , , , , ,000 TEHMP , , , , , , , , ,200 Notes: () Other ratings available on request. (2) Types TEVF, TEMF same as TEVP except capacitance approximately /2 of values listed. Type TEHMF same as type TEHMP except capacitance approximately /2 of values listed. 6

7 Standard Dimension Net weight creepage h approx. in/mm in/mm lb/kg 62./90 /29* 0/20 02./2600 6/6* 2/28 0/00./86* 0/20 /680 82/208* /26 20/20 2/28* 2/29 260/ /2* /2 290/0 6/08* 82/ 90/9900 8/69* 000/ /00 20/* 00/99 /289 0./9 9/2 /8 9.2/20 02/6 6/ / /99 222/68 20./06 0/62 266/66./92 00/680 22/88 8./06 600/2 99/0 96/98 8/80 8/226 22/ 200/9 6/66 296/8 2600/9 2/280.2/80 00/99 9/0 9.2/2026 / 6/ /222 00/90 22/00 2./092 60/8 28/060 8./2 0/9 0/800./90 9/896 /090 9./02 20/066 9/20 22/66 200/22 660/ /9 2/ * Heights shown are correct for types TEVF, TEMF, TEVP when equipped with Trench low profile basebox (standard). When equipped with Trench Universal basebox add.2 inches (08 mm). For types TETP and TEMP add,2 inches (08 mm).

8 Trench Facilities The Trench Group is your partner of choice for electrical power transmission and distribution solutions today; and for the development of your new technology solutions of tomorrow. Trench Austria GmbH Paschinger Strasse 9 Postfach A-060 Linz-Leonding Austria Phone: Fax: -2-6 Trench Brasil Ltda Via Expressa de Contagem, 268 Contagem, Minas Gerais CEP 20-8 Brazil Phone: Fax: Trench China MWB (Shanghai) Co., Ltd. No. 68, Jiancheng Road Minhang, Shanghai Peoples Republic of China 2002 Phone: Fax: Trench High Voltage Products Ltd., Shenyang No. 2 Zhengliang Er. Road Jing Shen Xi San Street Dao Yi Economic Development Zone Shenyang 06 P.R. China Phone: Fax: Trench Limited Bushing Division 2 Monarch Avenue Ajax, Ontario Canada LS 2G Phone: Fax: Trench Limited Coil Product Division Maybrook Drive Scarborough, Ontario Canada MV B6 Phone: Fax: Trench Limited Instrument Transformer Division 90 Midwest Road Scarborough, Ontario Canada MP B Phone: Fax: Trench Limited Power Line Carrier Division 8 Middlefield Road, Unit 6A Scarborough, Ontario Canada MV 2P9 Phone: Fax: Trench France S.A. 6, Rue du Général Cassagnou B.P. 0 F St. Louis, Cedex France Phone: Fax: Trench Germany GmbH Nürnberger Strasse 99 D-9600 Bamberg Germany Phone: Fax: Trench Switzerland AG Lehenmattstrasse CH-028 Basel Switzerland Phone: Fax: Trench (UK) Limited South Drive Hebburn Tyne & Wear NE UW Phone: Fax: E 2. Subject to change without notice (0.2006) Printed in Canada.

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