High-voltage electrical testing equipment is a specialized tool used to inspect, measure, and diagnose the performance and safety status of high-voltage electrical equipment (such as power transformers, circuit breakers, cables, and lightning arresters). The following are common categories and typical examples of high-voltage electrical testing equipment:
1. Insulation Performance Testing Equipment
Insulation resistance testers (megohmmeters) measure the insulation resistance of equipment (e.g., 500V, 1000V, 2500V, 5000V, etc.). Common models include manual megohmmeters and digital megohmmeters (e.g., the Fluke 1507).
Dielectric loss tangent (tanδ) testers measure the dielectric loss of insulating materials (e.g., transformer oil and cables) to assess aging or moisture. Examples include the Xilin bridge and automatic dielectric loss tester. Withstand Voltage Test Equipment
Power frequency withstand voltage testers: simulate power frequency high voltage (e.g., 50Hz) to test the insulation strength of equipment. DC withstand voltage testers: used for DC withstand voltage tests (e.g., 0-60kV) on cables and other equipment.
Series Resonant Withstand Voltage Tester: Uses the resonance principle to perform withstand voltage tests on high-capacity equipment (such as GIS and cables).
2. Partial Discharge Detection Equipment
Partial discharge detectors detect partial discharge (PD) within high-voltage equipment and assess insulation defects. Types include high-frequency pulse current, ultrasonic, and ultra-high frequency (UHF) methods.
3. Grounding and Resistance Testing Equipment
Ground resistance testers measure the resistance of grounding systems (e.g., three-pole and four-pole methods). For example, loop resistance testers (contact resistance testers) measure the contact resistance (micro-ohm level) of circuit breakers and switch contacts. For example, a 100A/200A DC loop resistance tester.
4. Circuit Breaker Characteristic Testing Equipment
Circuit breaker mechanical characteristic testers measure parameters such as opening/closing time, speed, travel, and bounce time. Examples include the KJTC-III and OMICRON CIBANO 500. Vacuum testers check the vacuum level of vacuum circuit breakers.
5. Transformer Testing Equipment
Transformer Ratio Tester: Measures transformer winding ratio and polarity.
Winding DC Resistance Tester: Measure transformer winding DC resistance (e.g., 1μΩ-20kΩ) to assess poor contact or broken wires. Examples include 10A/20A DC resistance testers.
Transformer Comprehensive Test Bench: Integrated functions include turns ratio, DC resistance, and no-load/load loss testing.
6. Cable Testing Equipment
Cable Fault Locator: Uses TDR (Transmitter Reflectometry) or high-voltage flashover to locate cable faults (short circuit, open circuit, ground fault). Examples include high-voltage bridges and cable fault flash detectors.
Cable Identifier: Identifies the path and phase of energized or de-energized cables.
7. Lightning Arrester (MOA) Testing Equipment
Lightning Arrester Leakage Current Tester: Measures the total current and resistive current of zinc oxide arresters to determine moisture or aging.
DC Reference Voltage Tester: Measures the U1mA reference voltage of a lightning arrester. 8. Infrared Thermal Imagers and Ultraviolet Imagers
Infrared thermal imagers detect local overheating of high-voltage equipment (such as connectors and insulators).
Ultraviolet imagers detect corona discharge or surface discharge.
9. Other Auxiliary Equipment
Phase voltammeters measure voltage, current, and phase angle (for relay protection calibration).
SF6 gas detection equipment detects SF6 gas purity, moisture content, or leaks in GIS equipment.
Application Scenarios
Preventive testing: Regularly test the insulation condition of equipment (e.g., “DL/T 596-2021 Preventive Testing Procedure for Power Equipment”).
Fault diagnosis: Locate cable faults, analyze partial discharge, etc.
New equipment acceptance: Verify electrical performance after installation. Based on specific requirements (such as voltage level and equipment type), select testing equipment that complies with standards (such as IEC and GB).
Post time: Sep-12-2025
