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GDYT-250kVA/250kV AC/DC Partial Discharge Test System
GDYT-250kVA/250kV Digital Intelligent AC/DC Partial Discharge-Free Test System with Integrated AC/DC PD-Free Transformer, Intelligent Control Console, Isolation Filter, Coupling Capacitor, High-Voltage Silicon Stack and Digital PD Detector, <0.5pC System Background Noise, One-Click AC/DC Switch, for 220kV and Below Electrical Equipment Type Tests and Factory Inspection.
- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
The GDYT-250kVA/250kV is a professional-grade, fully integrated AC/DC dual-mode PD-free test systemexclusively designed for power frequency withstand voltage, DC withstand voltage and partial discharge tests of 220kV and below high-voltage electrical equipment. It fully complies with IEC 60270:2015, GB/T 7354-2018, DL/T 848.3-2019 and GB/T 16927.2-2013 standards, adopting an all-system PD-free optimized design that includes seven core components: AC/DC PD-free test transformer, intelligent control console, isolation filter transformer, coupling capacitor, protective resistor, high-voltage silicon stack and digital partial discharge detector.
The system features an industry-leading <0.5pC system background noise, ensuring accurate detection of extremely weak partial discharge signals from the test object. Its innovative PLC+12-inch high-resolution touch screen intelligent control system supports one-click switching between AC and DC modes, and one-click completion of the entire test process including voltage boosting, withstand voltage timing, partial discharge detection and voltage reduction. The integrated GDJF-2007AD AC/DC digital partial discharge detector provides professional PD analysis functions including PRPD maps, spectrum analysis and automatic discharge type identification for both AC and DC voltage conditions. Equipped with comprehensive safety protection functions such as overvoltage, overcurrent, flashover, short circuit and DC discharge protection, it ensures the safety of operators and equipment during high-voltage tests. The modular design allows for easy transportation and on-site assembly, making it suitable for both laboratory type tests and on-site acceptance tests. Ideal for factory type tests, outgoing quality control, third-party arbitration tests and power company on-site acceptance tests of power transformers, GIS, high-voltage cables (including DC cables), instrument transformers, surge arresters and other high-voltage electrical equipment.
Specifications
| Parameter | Specification |
|---|---|
| System Parameters | |
| Compliance Standard | IEC 60270:2015, GB/T 7354-2018, DL/T 848.3-2019, GB/T 16927.2-2013 |
| System Background Noise | <0.5pC |
| Test Modes | AC withstand voltage test, DC withstand voltage test, AC partial discharge test, DC partial discharge test |
| Operation Modes | Fully automatic mode, Manual mode |
| AC Output Parameters | |
| Rated Capacity | 250kVA |
| Input Voltage | AC 380V±10%, 50Hz, three-phase four-wire |
| Output Voltage | 0 ~ 250kV AC (continuous adjustable) |
| Output Current | 0 ~ 1000mA |
| Voltage Regulation Accuracy | ±1% |
| Waveform Distortion | <3% |
| Rated Operation Time | 30 minutes continuous at rated load |
| DC Output Parameters | |
| Rated Capacity | 175kVA |
| Output Voltage | 0 ~ 350kV DC (continuous adjustable) |
| Output Current | 0 ~ 500mA |
| Voltage Regulation Accuracy | ±1% |
| Ripple Coefficient | <1% |
| Rated Operation Time | 15 minutes continuous at rated load |
| PD Detection Parameters | |
| PD Detector Model | Integrated GDJF-2007AD |
| Sampling Rate | 100MS/s per channel |
| Resolution | 12-bit |
| Detection Sensitivity | 0.1pC |
| Measurement Range | 0.1pC ~ 10000nC |
| Dynamic Range | >80dB |
| Frequency Bands | 9 standard combinations (10kHz~1MHz) |
| Map Display | PRPD (AC), waveform (AC/DC), spectrum, pulse count, trend |
| Control Parameters | |
| Control Architecture | High-performance PLC + 12-inch industrial touch screen |
| Timing Range | 0 ~ 9999s (adjustable) |
| Data Storage | Unlimited internal storage |
| Report Generation | Automatic Word/PDF report generation |
| Communication | USB, LAN |
| Safety Protection | |
| Overvoltage Protection | Yes (adjustable threshold) |
| Overcurrent Protection | Yes (adjustable threshold) |
| Flashover Protection | Yes |
| Short Circuit Protection | Yes |
| Zero Position Protection | Yes |
| DC Discharge Protection | Yes (automatic residual charge discharge) |
| Door Interlock Protection | Yes |
| Emergency Stop Button | Yes |
| High-Voltage Warning Light | Yes |
| General Parameters | |
| Power Consumption | <30kW |
| Total Weight | ~850kg (complete set) |
| Modular Design | Yes (7 independent modules) |
| Quick Connection | Yes (standardized connectors) |
| Wheeled Design | Yes (all components) |
| Operating Temperature | -10℃ ~ +50℃ |
| Operating Humidity | ≤90% RH (non-condensing) |
| Altitude | ≤2000m |
Applications
Core Test Objects
- Power transformers: 10kV~220kV oil-immersed and dry-type power transformers (including converter transformers)
- GIS equipment: 110kV~220kV GIS and HGIS gas insulated switchgears
- High-voltage cables: 10kV~220kV XLPE AC power cables and ±110kV DC power cables
- Instrument transformers: 10kV~220kV current transformers (CT) and voltage transformers (VT)
- Surge arresters: 10kV~220kV zinc oxide surge arresters (AC and DC types)
- Other equipment: Capacitors, reactors, bushings, high-voltage switches, converter valve components
Typical Usage Scenarios
- Electrical equipment manufacturers: Factory type tests and outgoing quality control
- Third-party testing institutions: Arbitration tests and compliance certification
- Power companies: High-voltage equipment acceptance tests and fault diagnosis
- Power engineering companies: Power grid construction and renovation project acceptance
- Technical schools and universities: Teaching and demonstration experiments
Advantages
Compliance with International Arbitration Standards
Fully meets IEC 60270:2015 and GB/T 16927.2-2013 standards, test results are globally recognized and legally valid → can be used as arbitration basis for quality disputes
Industry-Leading <0.5pC System Background Noise
All components are PD-free optimized, ensuring the purest test voltage → accurately detects extremely weak partial discharge signals in the test object
Unique AC/DC Dual-Mode Design
One system supports both AC and DC withstand voltage and partial discharge tests → reduces equipment investment by 40%, meets all test requirements of 220kV and below equipment
One-Click AC/DC Mode Switch
Automatically adjusts system parameters and protection thresholds, no manual wiring changes → improves test efficiency by 100% compared to traditional systems
Integrated Professional AC/DC PD Detection
No need for separate PD detector purchase and connection → reduces system complexity and total investment cost
Comprehensive Safety Protection System
Multiple protection functions including DC discharge protection → ensures the safety of operators and equipment during high voltage tests
Modular Design & Easy Transportation
Quick assembly and disassembly, wheeled design → suitable for both laboratory fixed use and on-site mobile testing
Standardized Automatic Report Generation
Generates IEC-compliant test reports with one click → eliminates manual report writing, ensures data consistency and traceability
FAQ
Q: How to switch between AC and DC modes?
A: The system supports one-click AC/DC mode switch on the touch screen. The built-in high-voltage silicon stack automatically switches into the circuit for DC mode, and the system automatically adjusts all protection parameters and test procedures. No manual wiring changes are required, greatly improving test efficiency and safety.
Q: What is the system background noise of GDYT-250kVA/250kV?
A: The system adopts an all-system PD-free design. The partial discharge of each component is strictly controlled: test transformer <0.3pC, coupling capacitor <0.15pC, protective resistor <0.05pC, silicon stack <0.1pC. The total system background noise is <0.5pC at rated voltage, which meets the IEC 60270 highest arbitration level requirements.
Q: What components are included in the complete set?
A: The complete set includes seven core components:
- GDYT-250kVA/250kV AC/DC PD-free test transformer
- Intelligent control console (with built-in PLC and 12-inch touch screen)
- 250kVA isolation filter transformer
- OWF-250kV/1000pF PD-free coupling capacitor
- BR-250kV/20kΩ PD-free protective resistor
- Built-in high-voltage silicon stack for DC rectification
- Integrated GDJF-2007AD AC/DC digital partial discharge detector
Q: Is it suitable for on-site testing?
A: Yes. The system adopts a modular design with standardized quick connectors. All components are equipped with heavy-duty universal wheels for easy movement. The complete system can be assembled and disassembled within 45 minutes, making it suitable for both laboratory fixed use and on-site mobile testing.
