This versatile system is specifically designed for measuring partial discharge in various electrical equipment, including transformers, motors, instrument transformers, cables, GIS, switches, and arresters, among others. The system's multi-channel measuring capability enables simultaneous testing at multiple points or for multiple tests. This method can be successfully used for big transformers and transformer substation.
Partial discharge test equipment refers to specialized high-voltage diagnostic instruments used to detect, measure, and analyze partial discharges (PD) occurring inside electrical insulation systems.
Partial discharge is a localized electrical breakdown that does not completely bridge the insulation between conductors. It typically occurs in defects such as voids, cracks, contamination, or air gaps within solid or liquid insulation. Over time, these micro-discharges degrade insulation and can lead to catastrophic failure in high-voltage assets.
Early detection of insulation faults before breakdown
Helps with condition-based maintenance planning
Reduces costly unplanned downtime
Improves long-term asset reliability
No partial discharge transformer
Partial discharge measuring instrument
Isolation low pass filter
Coupling capacitor
Current limiting resistance
Control panel
Frequency 50, 100, 150, 200, 400Hz
3dB fL：10, 20, 40KHZ optional
3dB fH：80, 200, 300KHZ optional
Rough adjustment 6 range 20±1dB, fine tuning range >20dB
| Input No. | Tuning capacitance range | Sensibility（PC）unbalanced circuit | Allow current RMS | |
| unbalanced | balanced | |||
| 1 | 0～25～100PF | 0.02 | 30mA | 0.25A |
| 2 | 25～100～400PF | 0.04 | 50mA | 0.5A |
| 3 | 100～400～1500PF | 0.06 | 120mA | 1A |
| 4 | 400～1500～6000PF | 0.1 | 0.25A | 2A |
| 5 | 1500～6000～25000PF | 0.2 | 0.5A | 4A |
| 6 | 0.006～0.025～0.1μF | 0.3 | 1A | 8A |
| 7 | 0.025～0.1～0.4μF | 0.5 | 2A | 15A |
| 8 | 0.1～0.4～1.5μF | 1 | 4A | 30A |
| 9 | 0.4～1.5～6.0μF | 1.5 | 8A | 60A |
| 10 | 1.5～6.0～25μF | 2.5 | 15A | 120A |
| 11 | 6.0～25～60μF | 5 | 25A | 200A |
| 12 | 25～60～250μF | 10 | 50A | 300A |
| 7R | resistance | 0.5 | 2A | 15A |
A key component in PD test systems, PD detectors measure discharge events, charge magnitude (pC), frequency, and waveform data. Typical PD detecion instruments support high sensitivity (down to 0.1pC), multiple channels, and graphical reporting.
Complete PD test systems combine: high voltage test source, coupling capacitors, PD analyzer, calibrators, and software for data acquisition & analysis. Systems may be designed for both offline acceptance tests and advanced offline diagnostics.
Online PD monitoring solutions continuously monitor insulation condition without de-energizing equipment, ideal for critical assets where service interruption is unacceptable.
High sensitivity (e.g., 0.1pC or lower) enables detecting early insulation issues, critical for quality assurance and preventive maintenance.
Equipment built to IEC 60270 and other global standards ensures measurement comparability, repeatability, and acceptance in utility/factory acceptance tests.
Support for multiple detection techniques (HFCT, TEV, UHF, acoustic) improves detection accuracy across various test objects.
Clear graphical outputs, phase-resolved PD analysis, and exportable test reports (CSV / PDF) improve field usability.
Transformers (HV/MV) PD testing & insulation assessment
Power cable partial discharge detection
Gas-insulated switchgear (GIS) insulation verification
Rotating machines (motors & generators)
Industrial assets & manufacturing quality control
Determine whether you need portable PD detectors, benchtop systems, or integrated PD test systems for lab use.
High sensitivity is critical for early detection and accurate insulation diagnosis.
Ensure compliance with IEC 60270 and relevant industry norms.
Q1: What is the difference between PD testing and PD monitoring?
Answer: PD testing is typically offline and conducted during acceptance or scheduled maintenance; PD monitoring is continuous online assessment.
Q2: What industries commonly use PD testing equipment?
Answer: Utilities, power generation, industrial manufacturing, aerospace, rail, and petrochemical sectors all rely on PD data.
Q3: What is required to interpret PD test results?
Answer: Interpretation involves analysis of discharge magnitude, phase position and frequency, comparing results to baseline measurements.
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