Current transformer secondary overvoltage protector KC500D-4Z

Current transformer secondary overvoltage protector

1.Intro

Once the secondary winding of the current transformer and its loop are open during operation, an overvoltage of several thousand volts or even tens of thousands of volts will be generated. This not only causes harm to the insulation of the secondary system, but also causes the transformer to be burnt out due to overexertion, and even endangers the safety of operators.
The current transformer secondary overvoltage circuit protector developed by Kaich is specially used to limit the overvoltage generated when the secondary open circuit occurs, and has action contact output, automatic light-emitting display, automatic blocking differential protection, There are manual or automatic reset functions, as well as multiple combinations of protectors with different functions.

2. Function

  • After the protector acts, it can limit the secondary overvoltage of the current transformer to a safe level;
  • After the protector acts, the fault circuit is displayed, which is convenient for troubleshooting;
  • There is a contact signal output after the protection action, which can be referenced by the external circuit;
  • There is an alarm sound prompt after the protection action, reminding the user to troubleshoot in time.

3.Features

  • After the protector acts, it can limit the secondary overvoltage of the current transformer to a safe level;
  • After the protector acts, the fault circuit is displayed, which is convenient for troubleshooting;
  • There is a contact signal output after the protection action, which can be referenced by the external circuit;
  • There is an alarm sound prompt after the protection action, reminding the user to troubleshoot in time.

4.Principle

The current transformer secondary open-circuit protector is mainly composed of nonlinear resistors with close to ideal protection characteristics. The protector is connected across both ends of the CT secondary winding. During normal operation, the leakage current is extremely small, and it is in a high resistance state of more than 100MΩ; when the CT secondary circuit is open, the voltage generated is much higher than the normal operating voltage, and the protector quickly Action, a low-resistance state similar to a short circuit, effectively limiting overvoltage.

The protector can provide protection for 18 CT secondary circuits at most. The fault circuit is displayed on the rear panel of the action, and there is a passive contact signal output. After troubleshooting, press the manual reset button, and the circuit will resume normal operation after returning to its original state.

5. Wiring

The standard protector is suitable for the current transformer with the secondary winding star connection. The terminals A, B, C and common terminal N of the protector are directly connected to the A, B, C phases and the secondary of the secondary winding of the current transformer. on the neutral point N. If only A, B (or A) phase windings are used, then C (or B, C) phases can be left unconnected, which will not affect the normal operation of the protector.

For the three-phase current transformer group whose secondary winding needs to be connected in a delta connection, our company can make it specially for the user, but it needs to be specified when ordering. See the attached figure for the word connection of the external lead terminal of the protector.

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1. The user should provide the relevant system rated voltage, primary system diagram and cabinet size diagram as the basis for the design of the overvoltage monitoring and suppression cabinet. 2. The size of the cabinet can be finalized only after it is designed by our company’s engineers and signed and confirmed by the user.
3. The user should clarify the functions of the device (including basic functions and optional functions). If there are any special requirements, they should be put forward when ordering.
4. If you need other additional accessories or spare parts, please indicate the required “name, specifications and quantity” when ordering

Packaging, transportation and storage
1. Packaging: Generally, it is packaged in wooden boxes, and the base of the cabinet should be fixed on the bottom plate of the packaging box;
2. Transportation: It is not suitable to be transported over long distances on highways below level three. The packaging can be dismantled when necessary. Important components should not be transported by road as much as possible; 3. Storage: When not used for a long time, it should be stored in a dry and ventilated warehouse and should not be outdoors for a long time. store.


Installation, commissioning and maintenance

1. Our company is responsible for drawing design and parameter selection according to the user’s requirements. After the equipment is assembled and debugged, it can only be shipped out of the factory after passing the inspection by professional inspectors. If the user needs it, our company can be responsible for on-site guidance and debugging services, and the user will provide necessary cooperation and assistance;
2. The equipment does not require maintenance and repair when it is working normally;
3. As long as the user abides by the rules of storage and use, if the product is damaged and cannot work properly due to quality reasons within 12 months from the date of shipment, the company will replace or repair the product free of charge for the user;
4. The company implements lifelong maintenance of equipment and provides spare parts at preferential prices for a long time.

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