Here is the **English translation** of the practical application scenarios for **PD-Free Testing (Partial Discharge-Free Testing)**:
1. Factory Testing of Power Transformers/Reactors**
- **Purpose**: Verify the insulation performance of high-voltage transformers/reactors under rated voltage to ensure no insulation degradation caused by partial discharge (PD).
- **Scenarios**:
- Insulation strength testing between transformer windings and core.
- Detecting internal voids, oil-paper insulation defects (e.g., moisture, impurities).
- Insulation system verification for UHV (Ultra High Voltage) transformers (e.g., ±800 kV DC transformers).
2. Insulation Testing of High-Voltage Cables and Accessories**
- **Purpose**: Ensure cable joints, terminations, and other accessories are free from PD-induced breakdown risks during long-term operation.
- **Scenarios**:
- Acceptance testing after cable installation (e.g., underground cables, submarine cables).
- Detecting micro-pores, mechanical damage, or uneven semi-conductive layers in cable insulation.
- Voltage ratings: 10 kV–500 kV, especially for cross-linked polyethylene (XLPE) cable systems.
3. GIS (Gas-Insulated Switchgear) and Circuit Breaker Testing**
- **Purpose**: Validate the SF6 gas insulation performance of GIS to avoid failures caused by PD.
- **Scenarios**:
- Insulation testing of GIS busbars, disconnectors, and earthing switches.
- Detecting metal particles, insulator cracks, or assembly errors causing discharge.
- Applicable to transmission systems of 110 kV and above.
4. Insulation Verification for Renewable Energy Equipment**
- **Purpose**: Ensure insulation reliability of wind power/photovoltaic equipment (e.g., wind turbines, inverters, pad-mounted substations) in harsh environments.
- **Scenarios**:
- Humidity-resistant insulation testing for offshore wind farm step-up transformers.
- Analyzing discharge characteristics of PV inverter high-voltage insulation materials.
- Detecting insulation stress issues caused by frequent switching or harmonics.
5. Traction Power Supply System Testing for Electrified Railways**
- **Purpose**: Guarantee safe operation of traction transformers and catenary insulators under high load.
- **Scenarios**:
- PD detection in traction transformers under 25 kV AC power supply.
- Insulation performance verification of catenary insulators in high-humidity/dusty environments.
- Preventing traction system tripping or train shutdowns due to discharge.
6. Research and Development of New Insulation Materials**
- **Purpose**: Evaluate discharge characteristics of novel insulation materials (e.g., nano-composites, eco-friendly gases).
- **Scenarios**:
- Laboratory simulation of PD thresholds under extreme voltages.
- Comparing traditional epoxy resins with new eco-friendly insulation materials.
- Providing test data for revisions of IEEE, IEC, and other international standards.
**7. Preventive Maintenance of Power Equipment**
- **Purpose**: Regularly inspect insulation conditions of operational equipment to identify latent defects.
- **Scenarios**:
- Annual insulation testing of substation transformers and capacitors.
- Detecting insulation aging (e.g., oil-paper carbonization) in aging equipment.
- Preventive replacement of high-risk equipment to reduce unplanned outages.
**8. HVDC (High-Voltage Direct Current) System Testing**
- **Purpose**: Ensure insulation stability of DC cables and converter transformers under continuous DC voltage.
- **Scenarios**:
- Long-term PD analysis of ±500 kV/±800 kV DC cables.
- Performance verification of valve hall insulators in high-altitude or polluted environments.
- Addressing space charge accumulation issues in DC electric fields causing PD.
**9. Aerospace and Military Equipment Testing**
- **Purpose**: Ensure fail-safe insulation for electrical equipment in high-reliability scenarios.
- **Scenarios**:
- PD detection in aircraft high-voltage distribution system insulation materials.
- Anti-extreme-environment insulation testing for military radars and shipboard power systems.
- Insulation life assessment of nuclear plant safety-grade transformers.
It can quickly and accurately measure the withstand voltage strength of electronic components, household appliances, insulating materials, instruments and meters, lighting appliances, and electric heating appliances.
Suitable for all kinds of household appliances, power switches, wires and cables, transformers, terminal terminals, high voltage bakelite electrical appliances, motors, medical, chemical, instrumentation, etc., as well as the safety of the strong current system voltage and leakage current testing, but also scientific research laboratories, technical supervision departments indispensable voltage test equipment.
Mainly applicable to solid insulating materials such as: plastic, film, resin, mica, ceramics, glass, insulating paint and other media at power frequency voltage or DC voltage breakdown strength and voltage resistance time test.
KDZD5550 series voltage breakdown tester is mainly used for testing the breakdown strength and withstand voltage of solid insulating materials under power frequency voltage or DC voltage.
KDYD-LH high voltage leakage marking tester is suitable for electrical and electronic products, household appliances and their materials for electrical marking and corrosion resistance test
It is mainly used to test the insulation performance of electrical equipment to ensure that the equipment can operate safely and reliably under normal working voltage.
The device has the function of memory of test parameters, the same test conditions do not need to be set for each test, and the power off will still remember the last test set parameters.
The test interface is simple and clear, and is equipped with schematic curve description, different parameters, different curve trend, easy to understand.
The control panel is simple, the function is clearly marked, and the operation is simple.
Widely used in electrical equipment, bakelite electrical appliances, transformers, power lines, energy meters, motors, power plugs, cables, etc. Breakdown voltage, withstand voltage test, as well as various insulating materials breakdown voltage test
Also known as electrical insulation strength tester, dielectric strength tester, etc., mainly applicable to solid insulating materials (such as: plastic, rubber, laminated materials, film, resin, mica, ceramics, glass, insulating paint and other insulatin
Widely used in electrical equipment, bakelite electrical appliances, transformers, power lines, energy meters, motors, power plugs, cables, etc. Breakdown voltage, withstand voltage test, as well as various insulating materials breakdown voltage test.
KDZD5550 series intelligent insulation material hot breakdown voltage tester is mainly suitable for solid insulation materials (such as: plastic, rubber, laminate material, film, resin, mica, ceramic, glass, insulating paint and other insulating materials
Products are mainly suitable for solid insulating materials such as: plastic, film, resin, mica, ceramics, glass, edge paint and other media under power frequency voltage or DC voltage breakdown strength and voltage resistance time test; The instrument is
