News Details

Series Resonance Withstand Voltage Test Device

Variable frequency series resonance is suitable for AC withstand voltage tests of various large power transformers, power cables, steam and hydro generators, and other capacitive equipment, which must be strictly conducted periodically according to test regulations. Under power frequency conditions, due to the large capacitance of the test object or the high test voltage requirements, the power capacity of the test device also has correspondingly high requirements. Traditional power frequency withstand voltage devices often have large single-piece volume and heavy weight, making them inconvenient for on-site transportation, and they are not easy to combine arbitrarily, resulting in poor flexibility.

Series Resonance Withstand Voltage Test Device

1. Basic Principle of Variable Frequency Series Resonance:

The variable frequency series resonance withstand voltage test uses the inductance of the reactor and the capacitance of the test object to form an LC series circuit. By adjusting the output voltage frequency of the variable frequency power supply, series and parallel resonance is achieved, obtaining high voltage on the test object. This is a new method for high voltage testing, highly praised by experts, and has been widely used both domestically and internationally.

2. Characteristics of Variable Frequency Series Resonance Test Device:

The variable frequency series resonance test device has large output capacity, high output voltage, and can arbitrarily combine reactors for AC withstand voltage tests on different test objects.

The variable frequency series resonance test device has small size and light weight, with each piece weighing no more than 50kg, making it especially convenient for field tests.

The variable frequency series resonance test device has good protection functions, including overvoltage protection, overcurrent protection, time protection, flashover protection, overheat protection, and module protection.

The variable frequency series resonance test device is extremely simple to operate and has both manual and automatic modes.

The variable frequency series resonance test device adopts a large screen, making test data clear at a glance, and can print test results.

The variable frequency series resonance test device has no risk of overvoltage after the test object breaks down, causing relatively little damage to the test object.

The variable frequency series resonance test device requires small power capacity for testing, only a fraction of the power capacity required for power frequency transformer testing, solving the problem of difficulty in finding power sources on site.

3. Scope of Application:

Suitable for AC withstand voltage test of 400mm2/35kV cross-linked cable with a length of 2000m.

4. Environmental Conditions for Use:

1 Ambient temperature: -10℃～40℃

2 Relative humidity: not greater than 90%

3 Altitude: below 2500 meters

5. Standards Referenced and Implemented for Equipment Manufacturing

1 DL/T849.6—2004 High voltage resonant test device;

2 GB 6450—1986 Dry-type power transformer;

3 DL/T848.2—2004 Test transformer;

4 GB/10229—1988 Reactor;

5 GB/T11920—1989 General technical conditions for control devices;

6 GB/T16927.1—1997 High voltage test techniques;

7 IEC358—1990 Coupling capacitors and capacitor dividers.

6. Equipment Configuration List