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GDYT Series Integrated PD-Free Withstand Voltage Test System
GDYT Series Digital Intelligent Partial Discharge Free AC Withstand & Induced Voltage Test System with PD Detector, Auto Control, Multi-Voltage Ratings, for HV Equipment Insulation Strength Test and Partial Discharge Detection.
- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
GDYT series is a professional integrated partial discharge free high voltage test system designed for power frequency AC withstand voltage test, induced voltage withstand test and partial discharge detection of power transformers, GIS, instrument transformers, power cables, surge arresters and other high voltage equipment in power utilities, equipment manufacturers, research institutes and third-party testing institutions. It strictly complies with DL/T 848.3-2004, IEC 60270 and GB 1094.3 standards, adopting epoxy insulation cylinder PD-free test transformer and high-fidelity linear variable frequency power supply that provides ultra-low background noise and stable high voltage output for accurate insulation performance evaluation and defect detection.
The series covers 5kVA to 300kW multiple power ratings and 50kV to 250kV voltage levels, supporting both power frequency AC withstand test and variable frequency induced voltage test. The power frequency mode is suitable for external insulation withstand test and PD detection of most HV equipment, while the variable frequency induced mode is specially designed for transformer longitudinal insulation (inter-turn, inter-layer) withstand test and PD measurement, avoiding core saturation under power frequency. The system is equipped with a high-performance digital partial discharge detector with 1pC detection sensitivity, supporting PRPD pattern display, pulse waveform analysis and phase-resolved analysis.
Specifications
| Parameter | Specification |
|---|---|
| Rated Power Range | 30 kW ~ 300 kW (customizable) |
| Output Frequency Range | 20 Hz ~ 300 Hz, continuously adjustable |
| Frequency Resolution | 0.01 Hz |
| Frequency Stability | ≤0.05% |
| Total Harmonic Distortion (THD) | ≤1.0% (under linear load) |
| System Background Partial Discharge | ≤10 pC |
| Output Voltage Level | Customized per transformer test requirements |
| Continuous Operation Duration | 180 min at rated load |
| Input Power Supply | 3-Phase AC 380V ±10%, 50Hz |
| PD Detection Sensitivity | 1 pC |
| PD Measurement Range | 1 pC ~ 100,000 pC |
| Control Architecture | PLC + 7-inch color touch screen |
| Operation Modes | Manual adjustment mode / Fully automatic test mode |
| Automatic Test Flow | Programmable multi-stage voltage ramp → constant voltage timing → automatic voltage step-down |
| Protection Functions | Zero-position start, over-voltage, over-current, flashover/breakdown automatic trip, emergency stop button |
| Data Storage | ≥1000 test records with timestamp; USB data export supported |
| Cooling Method | Forced air cooling |
| Operating Temperature | -10℃ ~ +50℃ |
| Ambient Humidity | ≤85% RH (non-condensing) |
| Altitude Limit |
≤1000 m |
| Compliance Standards | IEC 60270, DL/T 848.3-2004, GB/T 7354-2003, GB 1094.3-2017, DL/T 596-2021 |
Applications
Core Test Objects
- Power transformers: Oil-immersed and dry-type transformers of 10kV ~ 220kV, AC withstand, induced withstand and PD test
- GIS & switchgear: Gas insulated switchgear, high voltage switchgear, power frequency withstand and PD detection
- Instrument transformers: Current transformers, voltage transformers, insulation withstand and PD test
- Power cables: Medium and high voltage power cables, cable accessories, withstand voltage and PD test
- Other equipment: Surge arresters, insulators, busbars, insulation materials
Typical Usage Scenarios
- HV equipment manufacturers: Factory quality control, finished product delivery test, type test assistance
- Power utilities: Substation equipment acceptance test, preventive test and fault diagnosis
- Third-party testing institutions: Electrical equipment insulation performance certification and calibration services
- Research institutes & universities: High voltage insulation research, teaching experiment and new product test
- Engineering companies: On-site handover test of power transmission and transformation projects
Advantages
Compliance with International & Industry Standards
Fully meets IEC 60270, DL/T 848.3, GB 1094.3 → test results are traceable and comply with power test specifications and product quality standards
Ultra-Low Background Partial Discharge
System background ≤5pC, true PD-free high voltage power supply → accurately captures weak insulation defects, avoids missed detection of micro-discharge
AC / Induced Dual Mode Integration
One system covers both power frequency withstand and variable frequency induced withstand test → meets all insulation test requirements of transformers and other equipment, reduces equipment purchase cost
High-Precision Digital PD Detection
1pC sensitivity, multi-parameter analysis, intelligent anti-interference → quantitative and qualitative analysis of partial discharge, accurate location of insulation defects
Fully Automatic Intelligent Control
One-click completion of full test flow, automatic protection → reduces operation difficulty, avoids manual errors, ensures test safety
Complete Set & Ready to Use
Full configuration of all components, pre-calibrated delivery → no additional matching required, quick deployment, improves test efficiency
Mobile Durable Design
Wheeled chassis, industrial-grade components → suitable for both laboratory fixed use and on-site mobile test, wide application scenarios
FAQ
Q: What is the difference between power frequency withstand and induced voltage withstand test?
A: The two test items target different insulation parts:
- Power frequency AC withstand test: Mainly assesses the main insulation performance of equipment (winding to ground, phase-to-phase insulation), applies power frequency high voltage between the winding and the shell/ground
- Induced voltage withstand test: Mainly assesses longitudinal insulation performance (inter-turn, inter-layer, inter-disk insulation) of transformer windings. It applies voltage at the low-voltage side and induces high voltage at the high-voltage side, using frequency higher than power frequency to avoid core saturation GDYT series supports both test modes, and one set of equipment can complete all insulation test items of transformers.
Q: Why is ultra-low background partial discharge required?
A: Background partial discharge is the inherent discharge of the test system itself. If the background is too high, it will submerge the weak discharge signal of the tested sample, leading to missed detection and misjudgment. The ≤5pC ultra-low background of GDYT series ensures that the detected discharge signal completely comes from the tested sample, can stably capture pC-level micro-defects, and meets the strict requirements of factory test and preventive test.
Q: What equipment can this system test?
A: GDYT series has wide applicability, mainly including:
- Power transformers: AC withstand, induced withstand and partial discharge test
- GIS and high voltage switchgear: power frequency withstand and PD detection
- Instrument transformers, surge arresters, insulators: insulation withstand test
- Power cables and cable accessories: withstand voltage and partial discharge test
- Various insulation materials and electrical components: insulation strength verification
Q: What is included in the standard configuration?
A: The standard complete set includes: intelligent control cabinet, PD-free test transformer, digital partial discharge detector, isolation filter unit, standard coupling capacitor, high voltage protective resistor, high voltage test cable, grounding cable, power cable, fuse set, user manual, factory test report and CNAS calibration certificate. Optional accessories include cascade transformer set, extended test cable, PC analysis software, external printer, etc.
