As a new type of overvoltage protection device in power systems, the three-phase composite overvoltage protector has been widely used in power systems of 35kV and below. It is designed to limit lightning overvoltage, vacuum circuit breaker operation overvoltage, and various transient overvoltages that may occur in power systems. This device effectively protects the insulation of electrical equipment such as motors, transformers, switches, capacitors, cables, and busbars from damage. It provides reliable limitation for both phase-to-phase and phase-to-ground overvoltages, which traditional arresters cannot achieve.

Testing of overvoltage protectors should comply with the requirements of "DL/T 474.5-2006" Field Insulation Test Implementation Guide Part 5: Arrester Test Requirements. Three-phase composite overvoltage protectors are mainly divided into two categories: those with series gap overvoltage protectors and those without gaps. Testing these devices requires high-voltage power frequency AC and high-voltage DC power sources respectively. The testing process involves the use of DC high-voltage test equipment and AC withstand voltage test equipment, each set being large in size and numerous in components, making the wiring and testing procedures cumbersome and inefficient. Currently, there is no dedicated instrument in China that can cover both gap and gapless overvoltage protectors.

To address this issue, our company has developed a comprehensive testing device suitable for three-phase composite overvoltage protectors at voltage levels up to and including 10kV. This device is designed for debugging and testing projects of three-phase composite overvoltage protectors, aiming to detect dangerous defects such as internal insulation moisture and valve aging early on.

1. The instrument's main unit is housed in a high-strength, high-insulation, wear-resistant hard plastic sealed case, featuring an attractive appearance, robust durability, excellent shock resistance, high insulation grade, and ease of on-site transportation.
2. The instrument is powered by 220V AC mains electricity, suitable for various testing sites.
3. Thoughtful safety design: The instrument is equipped with a high-voltage output switch; only when placed in the OUT position can the hardware circuit connect to the high-voltage output circuit, effectively preventing accidental high-voltage outputs that could harm operators. When high voltage is output, the instrument emits audible and visual alarms to alert users on-site.
4. The main unit is built with a 32-bit high-speed processor, providing powerful data processing capabilities.
5. Full Chinese Simplified LCD display offers a user-friendly interface, making operation simple and intuitive.
6. The instrument features comprehensive functionality and flexible configuration. The main unit can directly output DC high voltage for testing gapless three-phase overvoltage protectors and zinc oxide arresters. It can also be configured with a test transformer for power frequency discharge voltage tests of series-gap overvoltage protectors. A single instrument can complete common overvoltage protector test items.
7. Test parameters include AC action voltage tests for series-gap overvoltage protectors and DC 1mA reference voltage tests for gapless overvoltage protectors and zinc oxide arresters, ensuring reliable and highly accurate data.
8. Complete accessory configuration meets the needs of various types of overvoltage protector testing sites.

Power Frequency Discharge Voltage Test

1. Output Voltage (AC): 0.00～30.0kV
2. Resolution: 0.1kV
3. Measurement Accuracy: ±1% ± 2 digits
4. Test Interval Time: ≥15 seconds
5. Automatically calculates the average of three tests and has an optional printing function

DC 1mA Reference Voltage Test

1. Rated Output (DC): Voltage 0-30kV, Current 0-1000μA
2. Measurement Range: Current 0-1000μA, Voltage: 0-30.0kVdc
3. Resolution: Current 1μA, Voltage: 0.1kV
4. Measurement Accuracy: ±1% ± 1 digit
5. Automatic Residual Voltage Discharge Function
6. Optional Printing Function

Other Parameters

1. Power Supply Method: 220V ± 10%
2. Operating Temperature: -10°C to +50°C
3. Relative Humidity: RH ≤ 80%
4. Altitude: <1000 meters
5. Dimensions:
   • Main Unit: Length 440mm × Width 300mm × Height 300mm
   • Test Transformer: Length 270mm × Width 270mm × Height 300mm
6. Weight:
   • Main Unit: 17kg
   • Test Transformer: 12kg