EN
GDYT-5/10 Portable VT Induced Withstand & PD Test System
GDYT-5/10 Series Digital Intelligent Variable Frequency Induced Voltage Withstand & Partial Discharge Test System for Inductive Voltage Transformers, with Ultra-Low PD Background, High-Precision PD Analyzer, Automatic Test Flow, for VT Factory Delivery Test, On-Site Acceptance and Preventive Maintenance.
- Description
- Specifications
- Applications
- Advantages
- FAQ
- Recommended Products
Description
GDYT-5/10 series is a professional dedicated test system for inductive voltage transformers (VT/PT), designed for power frequency induced voltage withstand test and partial discharge detection in transformer manufacturers, power utilities, engineering testing companies and third-party inspection institutions. It strictly complies with IEC 61869-3, IEC 60270 and DL/T 848.3 standards, adopting all-digital SPWM variable frequency power supply technology and PD-free optimized circuit design that avoids core saturation under power frequency and provides ultra-low background noise, ensuring accurate evaluation of VT turn-to-turn insulation performance and internal defect detection.
The series covers 5kW and 10kW two power ratings, with 20Hz to 400Hz continuously adjustable output frequency, perfectly matching the test requirements of 10kV to 110kV inductive voltage transformers. The system background partial discharge is as low as ≤3pC, which truly reflects the discharge level of the tested sample without background interference. It is equipped with a high-performance digital partial discharge detector with 1pC detection sensitivity, supporting pulse current method quantitative measurement, PRPD pattern display and discharge phase analysis, which can accurately identify internal insulation defects such as inter-turn short circuit, air gap discharge and floating potential.
Specifications
| Parameter | GDYT-5 (5kW Model) | GDYT-10 (10kW Model) |
|---|---|---|
| Rated Output Power | 5 kW | 10 kW |
| Applicable VT Voltage Class | 10kV ~ 35kV | 35kV ~ 110kV |
| Output Frequency Range | 20Hz ~ 400Hz, continuously adjustable | 20Hz ~ 400Hz, continuously adjustable |
| Frequency Resolution | 0.01 Hz | 0.01 Hz |
| Frequency Stability | ≤0.05% | ≤0.05% |
| Output Waveform Distortion (THD) | ≤1.0% (linear load) | ≤1.0% (linear load) |
| System Background Partial Discharge | ≤3 pC (under rated test voltage) | ≤3 pC (under rated test voltage) |
| PD Detection Sensitivity | 1 pC | 1 pC |
| PD Measurement Range | 1 pC ~ 100000 pC | 1 pC ~ 100000 pC |
| Input Power Supply | 1-Phase AC 220V±10%, 50Hz | 1-Phase AC 220V / 3-Phase 380V±10%, 50Hz |
| Test Mode | Manual mode / Fully automatic mode | Manual mode / Fully automatic mode |
| Timing Range | 0 ~ 9999s, adjustable | 0 ~ 9999s, adjustable |
| Protection Functions | Zero-position start, over-voltage, over-current, over-temperature, PD over-limit, emergency stop | Zero-position start, over-voltage, over-current, over-temperature, PD over-limit, emergency stop |
| Display Mode | 7-inch color touch screen | 7-inch color touch screen |
| Data Storage | ≥1000 groups of test records, USB export | ≥1000 groups of test records, USB export |
| Cooling Method | Forced air cooling | Forced air cooling |
| Operating Temperature | -10℃ ~ +50℃ | -10℃ ~ +50℃ |
| Ambient Humidity | ≤85% RH (non-condensing) | ≤85% RH (non-condensing) |
| Structure Type | Split portable chassis with casters | Split portable chassis with casters |
| Total Weight | ~65 kg (complete set) | ~95 kg (complete set) |
| Compliance Standards | IEC 61869-3, IEC 60270, GB 1207, DL/T 848.3 | IEC 61869-3, IEC 60270, GB 1207, DL/T 848.3 |
Applications
Core Test Objects
- Inductive voltage transformers: 10kV, 35kV, 66kV, 110kV single-phase electromagnetic voltage transformers for metering and protection
- Combined transformers: Combined voltage-current transformers, metering box built-in voltage transformers
- Medium-voltage PTs: Medium and low voltage voltage transformers for distribution systems
Typical Usage Scenarios
- Transformer manufacturers: Production line batch delivery test, finished product quality inspection, type test assistance
- Power utilities: Substation equipment handover acceptance test, routine preventive test and fault diagnosis
- Engineering testing companies: Power transmission and transformation project on-site acceptance, equipment performance verification
- Third-party testing institutions: Voltage transformer performance certification, metrological verification and calibration services
- Repair workshops: Rewound VT quality verification, insulation defect detection and repair effect evaluation
Advantages
Compliance with Professional VT Test Standards
Fully meets IEC 61869-3, IEC 60270, GB 1207 → test methods and indicators fully comply with voltage transformer professional test specifications, results are authoritative and comparable
Industry-Leading Ultra-Low Background PD
≤3pC system inherent discharge, dedicated PD-free optimized design → truly reflects the insulation state of the sample, avoids missed detection of micro-defects
Variable Frequency Induced Professional Design
20-400Hz wide frequency range, avoids core saturation → accurately assesses inter-turn and inter-layer longitudinal insulation, makes up for the deficiency of power frequency withstand test
High-Precision Quantitative PD Detection
1pC detection sensitivity, multi-dimensional analysis → quantitative measurement + qualitative judgment, accurate identification of insulation defect types
Fully Automatic Intelligent Test
One-click completion of the whole process, automatic over-limit protection → reduces operator skill requirements, avoids manual errors, ensures test safety
Split Portable Lightweight Design
Independent units, easy to transport and wire → suitable for both factory fixed batch test and on-site mobile acceptance, wide application scenarios
High Cost Performance Dedicated Solution
Professional parameter matching, no redundant functions → affordable price, ideal for transformer manufacturers and grassroots test teams for batch configuration
FAQ
Q: Why use variable frequency power supply for voltage transformer induced voltage test?
A: The induced voltage test assesses the longitudinal (turn-to-turn, inter-layer) insulation performance of the VT winding. If power frequency voltage is applied, the iron core will be seriously saturated, resulting in large excitation current, overheating of the winding, and even damage to the equipment. Using a frequency higher than the rated frequency (usually 150Hz, 200Hz or 300Hz) can avoid iron core saturation while ensuring the same induction voltage effect, which is the standard test method specified by IEC and national standards.
Q: What is the difference between this dedicated VT system and the general GDYT series?
A: The general GDYT series is a general-purpose solution for transformers, GIS, cables and other equipment, with wide voltage range and strong versatility. This GDYT-5/10 is a dedicated model optimized for voltage transformer test scenarios: the power and frequency range are precisely matched to VT test requirements, the background PD is lower (≤3pC), the system integration is higher, the operation is simpler, and the cost performance is better for users who only need VT test.
Q: Can this system test current transformers (CT)?
A: This system is mainly designed for induced voltage and partial discharge test of voltage transformers. For current transformers, power frequency withstand voltage and partial discharge test can be carried out with appropriate auxiliary fixtures. If you need a large number of CT tests, it is recommended to choose a special CT test system or a general-purpose GDYT series system.
Q: Is it suitable for on-site mobile test in substations?
A: Yes. The system adopts split-type portable design, each unit is equipped with casters and handles, the total weight is light, the wiring is simple, and it supports single-phase 220V power input (5kW model), which can be directly connected to the on-site power supply for test. It is very suitable for on-site handover acceptance and preventive test of substation equipment.
