Read CVToperating instructions.pdf text version

HM0.460.3301

CVT

Dry Type Vacuum On Load Tap Changer Operation Instructions

HM 0.460.3301

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Contents

1. General------------------------------------------------------------------------------------- 1 2. Application condition and requirement------------------------------------------------ 1 3. Type description--------------------------------------------------------------------------- 1 4. Main technical data----------------------------------------------------------------------- 2 5. Structure and working principle--------------------------------------------------------- 3 6. Installation of the tap changer----------------------------------------------------------- 4 7. Maintenance------------------------------------------------------------------------------- 4 8. Trouble shooting of common failures-------------------------------------------------- 5 9. Appendix----------------------------------------------------------------------------------- 5 Appendix 1: Tap changer connection diagram--------------------------------------- 6 Appendix 2: Overall dimension of the tap changer---------------------------------- 7 Appendix 3: Connection diagram between the tap changer and the AVR-------- 8

1. General

CVT dry type vacuum on load tap changer consists of a tap selector and a diverter switch. First the tap selector selects the adjacent tap without load, then the diverter switch makes the switching with load. The current switching is carried out in the vacuum interrupter of the diverter switch, hence it features in high reliability and long operation life. CVT dry type vacuum on load tap changer is applicable for dry transformer with voltage up to 12kV, the maximum rated current of the tap changer can be reached to 200A and max. operation position is 9. CVT tap changer is equipped with HMYK-10B automatic controller to realize the manual and automatic control.

2. Application condition and requirement

Indoor Environment temperature: -25 ~ 45 Atmosphere humidity: not higher than 95% at 25 There shall be no gas, steam or chemical dust which may seriously affect the insulation of the tap changer on site, or any explosives as well as electrical conductors. There shall be no serious vibrations on site.

3. Type description

CVT III - 160 / 12 - 09 09 Operation positions Maximum positions of the tap changer Highest voltage of the equipment Connection method Y: Regulate at the neutral point of star connection D: Regulate at any position Max. rated through current No. of phase(s) III: Three phases; I: Single phase Type of Tap changer

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HM0.460.3301

4. Main technical data

Item Phase Maximum rated through current (A) Short-circuit test Thermal stability (2s) current (kA) Dynamic stability (Peak value) Connection Rated step voltage (V) Maximum rated step capacity (kVA) Rated frequency (Hz) Maximum operation positions Highest equipment voltage (kV) Insulation to Power frequency withstand test ground and (kV) (1min) between phases BIL (1.2/50us) Power frequency withstanding voltage between neighboring taps (kV) (1min) Test voltage between neighboring taps Tap changer (1.2/50us) internal Power frequency withstanding voltage insulation between max. and min. tap (kV) (1min) Test voltage between max. and min. taps (1.2/50us) Power (kW) Motor Voltage (V) drive Rated current (A) system Frequency ( Hz) Operation time per tap change (s) Electrical life (Vacuum interrupter life) Mechanical life Overall dimension (L×H×W) mm Weight (kg) Standard complied with Parameter Three phase or single phase 160 200 3 4 7.5 10 Y: regulate at the neutral point of star connection D: regulate at any position 500 80 50 or 60 9 12 35 85 5 20 15 50 0.37 220V~240V, AC single phase 1.68 50 or 60 Not less than 4.4 Not less than 50,000 operations Not less than 500,000 operation 1400×1475×475 200 IEC 60214-89

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5. Structure and working principle

The tap changer is of cabinet structure. It consists of tap selector, diverter switch, motor drive system and automatic controller. When the tap changer is delivered, the tap selector, diverter switch and motor drive system have already been optimally connected. It's not necessary for the user to adjust.

5.1 Tap selector Tap selector contacts are divided into odd set of contacts and even set of contacts. When the even set of contacts are under working status, the odd set of contacts can select the taps. Vice versa, the even set of contacts can also select the taps. In this way, the tap changer contacts can switch from one position to an adjacent position without carrying current. The moving contacts of the tap selector are driven by a step-by-step moving mechanism, which is to ensure that the diverter switch will only activate after the tap is selected and when it is in the right position. There are both electrical and mechanical limits for the tap selector. When the tap changer is at the limit positions, it can only be operated in the back direction. 5.2 Diverter switch The contact system comprises two vacuum interrupters and a set of off circuit contacts. The transition circuit adopts single resistor asymmetrical pennant cycling circuit. The making and breaking of the vacuum interrupters and off circuit contacts are controlled by a cam switch. The movement of the cam board is driven by a spring mechanism. Once the mechanism is released, it will complete the switching without any outside intervention.

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HM0.460.3301 5.3 Motor drive system HMYK-10B automatic controller controls the back and forth rotation of the motor drive. It is by the position signals of the tap changer that the controller operates. For operation of the controller, please refer to HMYK-10B Operation Instructions. 5.3.1 Step by step control The electrical and mechanical system of the tap changer will stop automatically after one tap change, which is to ensure that after receiving a tap change order, the tap change will be completed without outside intervention. 5.3.2 Emergency stop If the tap changer is to be suspended during the operation, please press the "STOP" button. 5.3.3 Over current lock When required by the user, the tap changer can be equipped with an over current device. Once there is over current in the transformer, the device will be activated to lock the operation of the tap changer.

6. Installation of the tap changer

6.1 The tap changer is fixed by four M12 bolts at the bottom. Please refer to the installation dimension to the attached drawings. Connection of the tap changer and transformer. Use connecting conductors to connect the transformer taps to the terminals of the tap changer. Make sure the conductors are of proper length. There shall be no mechanical force imposed on the tap changer. Enough insulation distance shall be kept between the conductors. After the connection, a full cycle of the tap changer position switching shall be performed without load. Then measure the direct current resistance of the winding and perform the transforming ratio test. During the test, please check the consistency of the displayed position of the tap changer with the actual position. Notice If the transformer is to be dried, please disconnect it with the tap changer. The tap changer must NOT be dried.

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6.3

6.4

7. Maintenance

7.1 Maintenance intervals: The first maintenance shall be done when the tap changer reaches 5000 operations or after the first year of operation. Items to be maintained

7.2 4

7.2.1 Clean the surface of the insulation parts. 7.2.2 Lubrication: apply lubrication grease to the moving parts of the tap changer. 7.2.3 Check if the opening distance of the vacuum interrupter is 3~4mm 7.2.4 Check the vacuum degree of the interrupter: When the opening distance is 3mm, perform power frequency test on the interrupter. Impose a voltage of 3kV for 1 minute, if the interrupter breaks down, replace with a new one. 7.2.5 Check reliability of the fasteners. 7.2.6 Check contact resistances of tap changer, resistance of each pair of contacts shall be less than 500 µ 7.2.7 Check the transit resistor of tap changer, the value shall be within ±10% tolerance of the specified value on the nameplate. 7.2.8 Check the conductor connections of the tap changer. It can be judged by the direct current resistance of the whole electrical circuit. 7.2.9 After maintenance, perform mechanical operation test of at least four complete operation cycles. Meanwhile, check if the selecting and switching program is correct; check if various functionality of the tap changer is properly working; check if the position indication is correct

8. Trouble shooting of common failures

Failure Remote indication doesn't work Electricity discharge phenomenon Mechanical blocking Cause Plug of the controller is not well connected, power and operation terminal is not well connected. Vacuum interrupter damaged Insulation parts is too dirty Insulation parts are damaged Not well lubricated Mechanical part damaged Solution Plug again, connect the operation terminals according to the controller operation instructions. Replace interrupter Clean insulation parts with silk cloth Replace insulation part Re-apply lubrication oil or grease Contact with the manufacturer

9. Appendix

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HM0.460.3301

Appendix 1: Tap changer connection diagram

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Appendix 2: Overall dimension of the tap changer

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HM0.460.3301

Appendix 3: Connection diagram between the tap changer and the AVR

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Shanghai Huaming Power Equipment Co., Ltd.

Address: No. 977 Tongpu Road, Shanghai 200333, China Tel/Fax: (86) 21 - 5270 2715 Web Site: www.huamig.com E-mail: [email protected] [email protected]

2007.10

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