Operating procedures for high pressure testing

Legal analysis: The specific content of sensitive bending is specified in detail in the preventive test regulations for power equipment in the electric power industry standard of the People's Republic of China.

Legal basis: Article 6 of the "People's Republic of China Electric Power Industry Standard Preventive Test Regulations for Power Equipment" The regular test items are shown in Table 5, which are applicable to 35kV and above.

Transformers used in substations.

The overhaul test project is shown in Table 5 in the serial number, the bridge side stuff, wherein.

Applicable to the replacement of windings, the item is applicable to transformers used in substations of 35kV and above.

Oil-immersed reactors.

The periodic test items are shown in Table 5 (10kV and below only).

The overhaul test items are shown in Table 5 in the serial number, wherein.

This item is applicable to reactors of 330kV and above (10kV and below only).

Arc suppression coils. The periodic test items are shown in Table 5.

The overhaul test items are shown in Table 5 for the serial number, and the voltage and current transformers installed in the arc suppression coil.

The insulation resistance of the secondary winding should be measured (refer to serial number 24 in Table 5).

Dry-type transformers.

The periodic test items are shown in Table 5.

The overhaul test items of the replacement winding are shown in Table 5, of which 17 items are suitable.

For cast dry-type transformers.

Precautions during the operation of power frequency withstand voltage test.

1. In the process of pressure boost or withstand voltage test, if the following abnormal conditions are found.

The voltage and ammeter pointers swing a lot.

The test product makes an abnormal noise.

If it is found that the insulation is scorched or smoking, the voltage should be lowered immediately, the power supply should be cut off, the test should be stopped and the cause should be identified.

2. For the test of large-scale equipment, the airlift test of the test transformer should be carried out first, that is, the voltage should be boosted to the test voltage when the test product is not connected, so as to calibrate the indication accuracy of the instrument and adjust the ball spacing of the discharge ball gap.

3. The test personnel should do a good job in the division of responsibilities, set the safety distance of the test site, carefully check the grounding of the tested product and the test transformer, and have a special person to monitor the safety and observe the status of the tested product.

4. The main parts of the tested product should be cleaned and kept absolutely dry, so as not to damage the tested product and bring the error of the test value.

5. When doing the withstand voltage test, the boost speed should not be too fast [Industrial Electrical Appliance Network-CNELC], and prevent sudden pressurization, such as the sudden closing of the voltage regulator when it is not at the zero position, nor can it be suddenly cut off, and it should generally be opened when the voltage regulator drops to the zero position.

Precautions during the operation of the DC leak test.

1. For large-capacity samples (capacitors, ultra-long cables, etc.) during the test, the voltage should be slowly boosted to prevent the charging current of the tested product from being too large and burning out the microampere meter.

2. The test personnel should do a good job in the division of responsibilities, set the safety distance of the test site, carefully check the grounding of the tested product and the test transformer, and have a special person to monitor the safety and observe the state of the tested product.

3. During the test, the tested product, micro-ampere meter and test device should be closely monitored, and the voltage should be lowered immediately, the power supply should be cut off, and the cause should be found out once flashing, breakdown and other phenomena occur.

4. Before the test of the tested product, all external connections should be removed, and fully discharged, and the main parts should be cleaned and kept absolutely dry, so as not to damage the tested product and bring the error of the test value.

There are many items of high-voltage test, and different equipment and different test purposes have different test items and requirements. The high-pressure test items are further divided into parameter determination, routine test and destructive test. The basic high-voltage test items are:

Conventional test: insulation resistance test, DC leakage test, absorption ratio test, dielectric loss test, partial discharge test, etc.;

Destructive test: AC withstand voltage test, DC withstand voltage test, impact withstand voltage test, induction withstand voltage test, etc.;

Parameter determination: no-load and short-circuit test of transformer, volt-ampere characteristic test of transformer and transformer, capacitance, inductance, DC resistance measurement, temperature rise test, switch action characteristics test, loop resistance measurement, line parameter measurement, grounding resistance measurement, etc.

High Voltage Testing, What Is Your Product??? The products are different, and the national standards are also different.

1.The work ticket should be filled in for the high-voltage test.

2.The high-voltage test shall not be less than two people, and before the test, the person in charge of the test shall explain in detail the safety precautions in the test to all test personnel.

3.When the equipment connector needs to be disconnected due to the test, it should be marked before dismantling, and it should be inspected after disassembly.

4.The metal shell of the test device should be reliably grounded, the high-voltage leads should be shortened as much as possible, and firmly supported by insulation if necessary.

5.The power switch of the test device should use a bipolar knife switch that is clearly disconnected.

6.When the new test device is installed, there should be two series power switches in the low-voltage circuit, and an overload automatic drop device should be installed.

7.The test site should be equipped with a fence or fence, and hang a sign of "stop, high pressure danger". If the DUT is not in the same location, someone should be assigned to guard the other end.

8.Before the pressurization test, the test wiring must be carefully checked, and after it is correct, the irrelevant personnel leave the tested equipment, and the main test personnel can only operate under pressure with the permission of the person in charge of the test.

9.In the process of full pressurization, the high-voltage tester should concentrate and pay attention to abnormal conditions, and the operator should stand on the insulating pad.

10.When the wiring is changed or the test is completed, the booster equipment should be returned to the "0" position first, and then the test power supply should be disconnected. The DUT is discharged and the high-voltage part of the booster is short-circuited to ground.

11.The large capacitance under test equipment without a ground wire should be discharged before the test. During the HVDC test, the equipment should be discharged to the ground several times at the end of each time or at the end of the test, and the equipment should be short-circuited and grounded.

12.At the end of the test, the tester should dismantle the self-installed grounding short line, and inspect the tested equipment and clean up the site.

13.Special important electrical tests should have detailed test measures and be approved by the competent engineer.

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Electrical test safety technical operating procedures.

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Electrical test safety technical operating procedures.

First, the basic requirements for the test work.

1. All test work on the site should be carried out by at least two people, and one person should be designated to be responsible.

2. Before the start of each test, the person in charge of the work should explain the precautions in detail to all the test personnel, and take necessary safety measures according to the test content and environment. And get in touch with the substation and the on-site personnel, and the staff wear insulating protective gear.

3. In addition to the items that must be tested by permission, the test must be carried out only after the power test, power test, and grounding certificate charging must be tested on all other equipment.

4. The high-voltage connection in the test wiring should be shortened as much as possible from the distance between the other electrical parts and the ground, and the power production phenomenon must be ensured, and the insulation material should be isolated and fixed if necessary.

5. When using ladder climbing operations, it must be carried out in accordance with the regulations on aerial work. Without the permission of the person in charge of the work, the test device and instrument shall not be disassembled, and the unrelated knife switch shall not be operated or enter other places without the permission of the on-site duty personnel.

6. After the test is completed, all the test wiring and the safety measures arranged must be removed, and the original normal state must be restored.

7. For large-capacity equipment (motors, transformers) and capacitors, the cables should be fully discharged before the test before wiring, disassembling and testing.

2. Safety requirements for electrical test of high voltage test 3 (