Electric power workers often need to use dry-type test transformer in practical work, so what is the correct use method of dry-type test transformer? This paper takes zc-501c series dry test transformer newly developed by Zhuo measurement and control as an example to introduce the correct use of dry test transformer.
First, let's understand the functional characteristics of zc-501c series dry-type test transformer.
Compared with the oil immersed transformer of the same kind, zc-501c series dry test transformer obviously reduces weight and volume. It uses advanced production equipment, adopts the new technology of epoxy vacuum pouring of coil winding and CD type iron core, improves the insulation strength and moisture resistance in quality, effectively weakens the magnetic flux leakage and greatly strengthens the impact ability of transformer to withstand the test short-circuit current.
Zc-501c series dry-type test transformer has the characteristics of light weight, small size, beautiful shape, stable performance, easy to use and carry. It is suitable for the insulation performance test of various electrical equipment, DC high voltage and small current of various voltage systems or devices in the power system and various power users' on-site detection. It is especially suitable for on-site operation and use, especially in China A new type of AC-DC dual-purpose high voltage test transformer with internal renewal.
In addition, zc-501c series dry-type test transformer, compared with oil immersed test transformer of the same capacity and voltage, weakens magnetic leakage, improves insulation strength and moisture resistance. In general, zc-501c series dry test transformer has the following characteristics:
1. The dry-type test transformer is small in volume, light in weight, compact in structure, free of oil leakage and maintenance;
2. The wiring is simple, intuitive and easy to use;
3. Good insulation reliability and beautiful appearance;
4. The series of dry-type test transformers have over-voltage protection function.
After understanding the functional characteristics of zc-501c series dry-type test transformer, let's understand how it is used! Here is a summary of the following:
(1) before the test, the "shell
" end of the high-voltage test transformer and the grounding end of the power control box shall be connected“
”It must be well grounded, otherwise it will endanger the safety of people and equipment.
(2) before operation, be familiar with the electrical principle wiring diagram of high-voltage test transformer and power control box. If the DC withstand voltage and leakage test are to be carried out, the high-voltage wow or microammeter can be screwed on the high-voltage end of the high-voltage test transformer first.
(3) after the preparation is completed and the circuit is checked to be correct, the main power switch can be closed, and the red switch indicator light will also be on. If it is not on, turn the handle of the voltage regulator back to zero position in counter clockwise direction, and the indicator light on the red stop button will be on, otherwise the start button will refuse to close.
(4) press the start button and the green button indicator light will be on. At this time, rotate the handle of the voltage regulator slowly and evenly at the speed of 1.5-2 kV per second clockwise. The high voltage will rise gradually and pay close attention to the indication of the voltmeter and the condition of the test object until the required test high voltage is reached.
(5) to test the withstand voltage test time of the product, pull the timing time required by the timer and press the timing and alarm switch, that is, test the withstand voltage of the product within the specified time, and then give an alarm to inform that if the tested product is broken down, the over-current relay will trip automatically, at this time, the reading of the voltmeter value is the value of the breakdown voltage of the product.
(6) if it is necessary to protect the tested product from breakdown, the protection ball gap can be connected continuously at the high voltage side to adjust the discharge voltage of the protection ball to about 1.15 times of the test voltage.
(7) schematic diagram of high pressure test;
:
When using, there are the following precautions
1. The insulation test products of high-voltage electrical appliances are safe and correct. In addition to being familiar with the product manual, they must be carried out in accordance with the relevant national standards and plans; GB / t16927-1996 high voltage test technology, DL / T596-1996 preventive test procedures for electric equipment
2. In the normal insulation of high-voltage electrical appliances, this series of products are not allowed to exceed the rated output voltage.
3. When using this series of products to form the cascade high voltage test, pay special attention to check the transformer body and insulation of level 2 and 3
The condition of the bracket, the correctness of the connecting wire, the protective grounding and protective grounding of the whole system.
The above is the use method of zc-501c series dry test transformer. Do you understand? If you don't understand anything, you can contact our customer service at any time.
