Technical Proposal for YHXZB-180kVA/60kV Variable Frequency Series Resonance Withstand Voltage Test Equipment

1. Basic Principles of Series and Parallel Resonance:

1.1 The resonance withstand voltage test utilizes 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 the Series and Parallel Resonance Test Device:

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

2.2 The series and parallel resonance test device is compact and lightweight, making it particularly convenient for field tests.

2.3 The series and parallel resonance test device has good protection functions, including overvoltage protection, overcurrent protection, time protection, flashover protection, overtemperature protection, and module protection.

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

2.5 The series and parallel resonance test device uses a large screen, making test data clear at a glance, and can print test results.

2.6 The series and parallel resonance test device has no risk of overvoltage after the test object breaks down, causing minimal damage to the test object.

2.7 The series and parallel resonance test device requires a small power supply capacity, only a fraction of that needed for power frequency transformer testing, solving the problem of difficult-to-find power sources on site.

3. Applicable Scope of the Equipment

3.1 Suitable for AC withstand voltage testing of 300mm2/10KV cables with a length of 3 kilometers.

4. Standards Referenced and Implemented for Equipment Manufacturing

DL/T849.6—2004      "High Voltage Resonant Test Devices"

GB 6450—1986        "Dry-type Power Transformers"

DL/T848.2—2004      "Test Transformers" 

GB/10229—1988       "Reactors" 

GB/T11920—1989      "General Technical Conditions for Control Devices"

GB/T16927.1—1997    "High-Voltage Test Techniques"

IEC358—1990         "Coupling Capacitors and Capacitor Dividers"

GB311.1              "Insulation Coordination for High-Voltage Transmission and Distribution Equipment"

DL/T846—2004        "General Technical Conditions for High-Voltage Test Equipment"

Q/CSG10007—2004    "Regulations for Preventive Tests of Power Equipment"

GB7328—87          "Measurement of Sound Level of Transformers and Reactors"

DL474.4—1992      "AC Withstand Voltage Test"