What are the high voltage test items? What are the functional features of high voltage test equipmen

1. Transformer transformer, the specific test items are:

1. Measurement of transformer insulation resistance (before withstand voltage test) with 2500V shake meter.

Measurement. 2. For the measurement of DC resistance of transformer, the DC resistance rapid tester is used to measure the high-voltage side and low-voltage side of the transformer respectively.

3. The position of each tap changer of the transformer.

Variable ratio test. (Measurement error 5%-1%)

4. Transformer oil.

(This item is averaged 5 times.)

5. Transformer withstand voltage test (required to suppress the power frequency voltage of 30kv, 1 minute).

6. The transformer test cycle is once a year.

2: Power cable test, specific projects are:

1. Measurement of insulation resistance. It is performed before the DC withstand voltage test. Phase insulation, use 2500V shake meter shake for 1 minute.

2. The test of power frequency voltage, the test voltage is 28kV, every 10kV is recorded, it rises to 28kV, the pressurization time is 15min, no breakdown, and the leakage current is less than 50 UA.

3. The test cycle is once a year.

Three: electrical equipment test: specific items are: (high-voltage switchgear).

1. Insulation resistance measurement (including busbar, circuit breaker, transformer insulator.

Measurement of phases and ground. ）

2. Withstand voltage test. (Including busbar, transformer, circuit breaker, insulator, busbar, insulator 42kV, 1 minute, circuit breaker, transformer, 28kV, 1 minute).

3. Circuit breaker characteristics test and circuit breaker withstand voltage test. (Power frequency withstand voltage 28kV; 1 minute).

4. The test cycle is once a year.

Four: relay debugging: specific projects are:

1. Check whether the mechanical parts such as turntables, gears, and contacts are in good condition.

2. Carry out starting current, fixed value current, and tripping.

The setting of current and quick-break current should be recorded. (The relay action error is not more than 5%)

3. Carry out the circuit breaker tripping test at fixed value. (Splitting and closing, tripping).

4. The test cycle is once a year.

Five: grounding electrode grounding resistance.

Measurement: Measured with a special shake meter, the resistance value is below 4, and the test cycle is once a year. (The grounding resistance is not greater than 4 for power failure).

Six: Protective equipment test: specific items are:

High-voltage insulating gloves, insulating boots, brake rods, and high-voltage electroscope tests, with a cycle of once a year.

Seven: lightning arrester.

Breakdown voltage test, the test cycle of the original valve arrester is once every 1 year. Now it is changed to zinc oxide arrester, and the test period is once a year, (test items are 1 mA reference voltage test and 75% reference voltage leakage current measurement.) ）

There are many levels of high voltage, so let's give you an experimental project that needs to be done for 10kV electrical equipment.

10 thousand volt electrical equipment test project.

1. Circuit breaker.

1. Characteristic test (time, synchronous, action voltage, bounce time, stroke).

2. Loop resistance.

3. Vacuum degree (when vacuum circuit breaker, it is generally not replaced by fracture withstand pressure, because the test equipment is not mature).

4. AC withstand voltage.

5. Insulation test.

Equipment used: circuit breaker characteristic tester, loop resistance tester, vacuum tester, insulation resistance tester, AC and DC withstand voltage device.

2. Current transformer.

1. Converter ratio test (error).

2. Voltammetry characteristics.

3. Polarity. 4. Insulation test.

5. Angular difference ratio test (measurement).

6. AC withstand voltage.

Equipment: transformer comprehensive tester, insulation resistance tester, AC and DC withstand voltage device, angular difference ratio tester.

3. Voltage transformer.

1. DC resistance.

2. Insulation resistance.

3. Variable ratio test.

4. Withstand pressure. Equipment: Single-arm bridge, DC resistance tester, insulation resistance tester, ratio tester (voltage), AC and DC withstand voltage device.

Fourth, lightning arrester.

1. Leakage current.

Voltage in milliampere.

3. Insulation test.

Instruments used: DC high voltage generator, lightning arrester tester, insulation resistance tester.

5. Other equipment (porcelain bottles, wall casings, wirings, isolation switches).

1. Insulation resistance.

2. AC withstand voltage.

3. Nuclear phase instrument (line).

4. Loop resistance (isolation switch).

Instruments used: loop resistance, AC and DC withstand voltage device, insulation resistance tester.

The function of high-voltage test equipment: to test the dielectric strength of power equipment and power materials under the specified voltage, and test the insulation performance of the tested product.

The equipment high-voltage test is an important measure and method to test the technical indicators of substation equipment, because of its strong technical and professional nature, and the test voltage is high in the test process, so it is dangerous and destructive.

The high-voltage test auxiliary system of substation equipment of Wuhan Edian Company is based on many years of practical experience in high-voltage test, and realizes the safety and quality of high-voltage test by standardizing, rationalizing and scientificizing the test steps of substation equipment.

At the same time, the relevant test data are stored in the database, which is of great reference value for the high-voltage test work, and realizes the safety, standardization, standardization and orderliness of the test work of substation equipment. The system can be widely used in the high-voltage test field of various power plants and power supply enterprises.

There are two types of performance verification, such as mechanical property test, current-carrying capacity test, breaking (breaking) and closing (switching) ability test, insulation performance test, and special environment adaptability test.

1. Mechanical properties are tested with a smile.

Basic testing of high-voltage electrical appliances. According to statistics, about 80% of the accidents in the power system are caused by the poor mechanical performance of high-voltage electrical appliances.

The mechanical properties test includes: Mechanical operation test. It is used to check the performance of the product under the specified operating energy.

Temporal characteristic test. Measure the operating time of the product, such as closing time, opening time, no current time of reclosing operation, metal shorting time, etc.

2. Current carrying capacity test.

It is used to assess the temperature rise and dynamic and thermal stability of the conductive circuit after the normal working current and the short-term short-circuit current.

Mainly: temperature rise test. When the high-voltage electrical product passes through the normal working current, due to the resistance loss, eddy current loss and hysteresis loss, the electrical energy is converted into heat energy, part of which is lost to the surrounding medium, and part of the heating of the current-carrying conductor increases its temperature.

Electrical equipment test: the specific items are:

1. Insulation resistance measurement (including the measurement of busbar, circuit breaker, transformer insulator phase and ground.) ）

2. Withstand voltage test. (Including busbar, mutual inductor, circuit breaker, insulator, busbar, insulator 42kV, 1 minute, circuit breaker, transformer, 28kv, rotten 1 minute).

3. Circuit breaker characteristics test and circuit breaker withstand voltage test. (Power frequency withstand voltage 28kV; 1 minute).

4. The test cycle is once a year. <>

Macroscopically speaking, high-voltage tests can be divided into two categories, namely research tests and industrial tests. It is used in the fields of high-energy physics (accelerators), pulsed power technology, electric power and electrotechnical technology.

Tests in the field of electrical product manufacturing can be divided into routine tests and type tests. The test of power system can be divided into electrical installation engineering, electrical equipment handover test, power equipment preventive base test, and power transmission and transformation equipment state maintenance test.

From the waveform properties of the applied voltage, it can be divided into AC high voltage test, DC high voltage test and impulse high voltage test. There are also impulse high current tests, artificial pollution tests, etc.

According to the different test items, the high-voltage test can be divided into insulation test and characteristic test.

Preparation before the high pressure test:

1. Draw up the correct test plan. The content of the test plan includes the purpose of the test, the test standard, the test wiring, the test back skin inspection equipment, the operation methods and steps, the precautions, the safety measures, the division of labor of the test personnel, the expected results, etc. For the destructive test of important electrical equipment, detailed test measures must be formulated before the test, and can only be implemented after the approval of the relevant departments at a higher level.

2. Before the test, the installation location, surrounding environment, model and specification, operation history and failures of the tested equipment should be clear.

3. For the complex test of large-scale equipment, a clear division of labor should be carried out in advance for the personnel participating in the test to ensure that the test is carried out in an orderly manner. <>

Can you help introduce the specific parameters of the equipment?

What are the main items for the acceptance of high-voltage distribution cabinets?

Please refer to the relevant regulations of your province and city for handover, preventive and condition-based maintenance tests. Boss, there are dozens of pages in any book, and I can't write it.

Find the "Q HBW 14701-2008 Power Equipment Handover Pre-test Regulations" 555555 from the Internet

Breaking and closing ability test One of the main performance tests of high-voltage switchgear. Verify the ability of the high-voltage switchgear to interrupt the short-circuit (normal) current and the ability to close the short-circuit (normal) current at the highest operating voltage. According to the use of high-voltage switchgear in the power system, its breaking and closing capacity tests include:

End short circuit opening and closing ability test. It refers to the opening and closing ability test that occurs when the outlet end of the high-voltage switchgear is short-circuited. Out-of-step interrupting and closing ability test.

It is also known as inverting breaking and closing ability test. When there is a serious failure in the power system, the two power systems will be seriously out of sync. At this time, the circuit breaker will break the two systems to decolumn, and the breaking of this performance is called out-of-step breaking.

Breaking test of near-zone faults. Refers to a short circuit breaking test a few kilometers away from the exit of the circuit breaker. Because it has a section of line, its short-circuit current is smaller than that of the end short-circuit current, but the recovery voltage is stricter than that of the end short-circuit.

Capacitance current breaking and closing ability test. Capacitor current refers to the no-load long-line charging current, capacitor bank current and cable line charging current. Small inductor current breaking and closing ability test.

Small inductor current refers to the excitation current, motor current and reactor current of the no-load transformer. Its breaking feature is that the circuit breaker is prone to interception and overvoltage during the breaking process. Interrupting test for developmental faults.

Developmental fault refers to the fault of short circuit of power supply caused by the overvoltage generated by the circuit breaker when the circuit breaker interrupts the small inductor current or capacitive current and endangers the insulation of the power equipment. The characteristic of this fault is that the circuit breaker originally flowed through a small inductor current or capacitive current, which became a large short-circuit current due to a sudden short circuit of the power supply, which brought great difficulties to the circuit breaker, and caused an accident due to the insufficient mechanical strength of the arc extinguisher. Parallel breaking test.

It refers to a special wiring situation of the power system, that is, an output line is powered by two power supply sources, and each power supply line is protected by a circuit breaker. In the event of a short circuit in the output line, both circuit breakers need to be opened. Since the action time of the two circuit breakers is always sequential, the circuit breaker that breaks first will break first, and the short-circuit current flowing through the circuit breaker will suddenly increase from a part of the original share to the whole one.

The situation is similar to developmental faults, which can also cause great difficulties for circuit breakers. Interrupting test of out-of-phase ground fault. It refers to the short circuit breaking test with different grounding on both sides of the circuit breaker.

The breaking voltage of this section of the short circuit on both sides of the circuit breaker is increased from the phase voltage at the time of normal breaking to the line voltage.