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HF-WC-622 Handheld Partial Discharge Tester for Switchgear
The Partial Discharge Tester for Switchgear is a portable live-line detection device. It precisely captures internal partial discharge signals of high-voltage switch cabinets, judges insulation aging and hidden faults, pinpoints abnormal positions rapidly, and delivers early alarms to effectively avoid insulation breakdown and power system accidents during daily operation.
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- Portable compact design, ultra-lightweight, net weight only 0.3kg for easy handheld carrying.
- Integrates Transient Earth Voltage (TEV) and Ultrasonic dual measuring methods for field inspection. It detects all types of partial discharge defects inside medium & high voltage switchgear (3~66kV) and is compatible with diverse power equipment.
- Precisely acquires partial discharge data, displaying numerical values of ultrasonic signals and TEV electrical signals. Via multi-functional interfaces, optional detection modes including contact ultrasonic, ultrasonic parabolic reflector, UHF and HFCT are available to test cables, transformers, GIS and other power facilities.
- Built-in red & yellow indicator lights for graded partial discharge alarm reminder.
- Supplied with dedicated headphones, enabling technicians to listen and locate partial discharge activities on site.
- Two optional measurement modes: single partial discharge testing & continuous cyclic measurement.
- Extremely user-friendly operation; operators can master all functions within 10 minutes.
- Outputs comprehensive key measurement data: amplitude, 1-second pulse count, pulses per cycle, short-term severity level, and historical test records.
- Adopts color LCD screen with combined graphic & digital display, which intuitively shows whether partial discharge intensity exceeds the safety threshold.
- Exclusive advanced sampling technology ensures outstanding data accuracy and strong anti-interference performance under complex electromagnetic environments.
Technical Performance Specifications
Table 1: HFCT (High Frequency Current Transformer) Method
Applicable scenario: Wind grounding wire through the sensor, used for partial discharge inspection of transformers and distribution cables
| Parameter Item | Technical Index |
|---|---|
| Detection Frequency | 0.5 ~ 100 MHz |
| Sensitivity | 6 mV/1 mA |
| Dynamic Range | 60 dB |
Table 2: Ultrasonic Method
Contact Ultrasonic Sensor
Applicable scenario: Attach sensor to equipment outer surface, for PD testing of GIS, transformers and fully insulated switchgears (Ring Main Units); effectively identifies solid insulation defects
| Parameter Item | Technical Index |
|---|---|
| Detection Frequency | 20 ~ 200 kHz |
| Measurement Range | 0 ~ 30 mV |
| Sensitivity | ≤5 pC |
Non-contact Ultrasonic Sensor
Applicable scenario: Aim the sensor at gaps of switchgear and other electrical devices, to detect insulation defects of non-enclosed power equipment
| Parameter Item | Technical Index |
|---|---|
| Resonant Frequency | 40 kHz |
| Dynamic Range | 0 ~ 70 dBuV |
Table 3: UHF (Ultra High Frequency) Method
Applicable scenario: Install sensor at basin-type insulator position, dedicated to GIS & HGIS partial discharge diagnosis
| Parameter Item | Technical Index |
|---|---|
| Detection Frequency | 300 ~ 1500 MHz |
| Sensitivity | ≤5 pC (Laboratory environment) |
Table 4: TEV (Transient Earth Voltage) Method
Applicable scenario: Paste sensor on switchgear enclosure surface, for PD inspection of high voltage switchgears & ring main units
| Parameter Item | Technical Index |
|---|---|
| Signal Acquisition Principle | Capacitive Coupling |
| Frequency Range | 3 ~ 100 MHz |
| Measurement Range | 0 ~ 60 dBmV |
| Sensitivity | 1 dBmV |
Packing List – Handheld Partial Discharge Tester for Switchgear
| Quantity | Item Name | Description |
|---|---|---|
| 1 Set | PD Tester Main Unit | Handheld partial discharge tester host with color LCD screen |
| 1 Pc | TEV Sensor | Transient earth voltage sensor for switchgear PD detection |
| 1 Pc | Contact Ultrasonic Sensor | For GIS, transformer and closed switchgear inspection |
| 1 Pc | Non-contact Ultrasonic Sensor | 40kHz resonant frequency for open equipment gap detection |
| 1 Pc | UHF Sensor | 300–1500MHz ultra-high frequency sensor for GIS/HGIS |
| 1 Pc | HFCT Sensor | High-frequency current transformer for cable and transformer PD test |
| 1 Pc | Detection Headphone | For on-site PD sound listening and fault positioning |
| 1 Pc | USB Data Cable | For data export and device charging |
| 1 Pc | AC Charger Adapter | Universal power supply charger |
| 1 Pc | English Operation Manual | Detailed user guide for operation and parameter introduction |
| 1 Pc | Factory Calibration Certificate | Official calibration report |
| 1 Pc | Portable Protective Case | Shockproof and drop-proof carrying box for outdoor inspection |
| 1 Pc | Warranty Card | After-sales warranty document |
FAQ for Handheld Partial Discharge Tester for Switchgear
Q1: What is a handheld switchgear partial discharge tester used for?
A: It is a portable, non-invasive live-test device for high-voltage switchgear. It detects and locates hidden partial discharge faults including insulation aging, floating potential discharge, metal particle discharge and surface tracking, effectively preventing insulation breakdown, short circuits and unexpected power outages.
Q2: What detection technologies does the tester adopt?
A: It integrates three core detection modes: TEV for internal high-frequency discharge signals of closed cabinets, Ultrasonic (UA) for acoustic discharge signals through gaps, and optional UHF for high-sensitivity detection of tiny defects. Multi-mode detection greatly improves fault coverage and positioning accuracy.
Q3: Does testing require a power outage?
A: No. It supports fully live online detection without equipment power-off or external high-voltage excitation, enabling real-time fault inspection during normal operation and avoiding power supply and production losses.
Q4: What equipment is the tester applicable to?
A: It fits 10kV–35kV power distribution equipment, including conventional switch cabinets, GIS, ring main units and cable branch boxes, widely used in substations and industrial & commercial power systems.
Q5: Does operation require professional training?
A: Basic operation is simple with a user-friendly interface and one-key detection, requiring no advanced training. Basic electrical knowledge is only needed for accurate signal analysis and fault severity judgment.
Q6: What is the standard on-site testing method?
A: For TEV testing: Attach the sensor closely to the cabinet surface and test each partition in sequence. For ultrasonic testing: Aim the probe at cabinet gaps, seams and insulation parts for slow scanning. For UHF testing: Place the antenna near insulation joints for high-sensitivity sampling. Record real-time data and waveforms for analysis.
Q7: How to avoid external interference?
A: The device is built with anti-interference algorithms. On-site tips: Keep away from high-power and signal transmission equipment; ensure tight sensor contact; eliminate cabinet static electricity; and verify results with multiple test comparisons.
Q8: What is the routine inspection cycle?
A: Normal operating equipment: every 6 months. Aging, high-load or fault-history equipment: every 3 months. Additional inspections are required after thunderstorm seasons, equipment maintenance and tripping faults.
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