RDYDTW-30kVA/100kV PD and Withstand Voltage Test Device
- Wrindu
- Shanghai, China
- about 20 working days
- 500 set/month
- RDYDTW-30kVA/100kV
This equipment is mainly used for power frequency withstand voltage and partial discharge testing of electrical products up to 35 kV class, including instrument transformers, power transformers, high-voltage circuit breakers, and cable accessories. It is also suitable for scientific research and laboratory testing applications.
It is designed for indoor use under standard operating conditions, with altitude up to 1000 m, temperature from -10°C to +40°C, and humidity ≤90%. It requires a stable sine wave power supply (distortion <3%) and a reliable grounding system with resistance below 0.5 Ω to ensure safe and accurate testing.
Composition of RDYDTW-30kVA/100kV Complete Set
| No. | Equipment Name | Model / Specification | Quantity |
|---|---|---|---|
| 1 | Power Frequency Partial Discharge-Free Test Transformer | RDYDTW-30kVA/100kV | 1 set |
| 2 | Isolation Transformer | GLB-30/0.38/0.38 | 1 set |
| 3 | Column Voltage Regulator | TEDGC-30/0.38/0～0.42 | 1 set |
| 4 | Capacitive Voltage Divider & Coupling Capacitor | TAWF-100/400 | 1 set |
| 5 | Power Frequency Protective Resistor | GR100-0.3/5 | 1 piece |
| 6 | Control Unit | AC-2020 | 1 set |
| 7 | Noise Filter | LBQ-30/0.4 | 1 set |
| 8 | Triple Frequency Generator | SBP-30/0.38/0.4 | 1 set |
| 9 | Partial Discharge Detector | — | 1 set |
| 10 | Cables and Accessories | — | 1 set |
Set Features
The test system is shown in the circuit diagram below. It is mainly composed of a partial discharge-free test transformer (B1), a voltage regulator (TY), a protective resistor (R), and a capacitive voltage divider (C1, C2). These parts work together to ensure stable voltage control and accurate partial discharge testing.
High-voltage low-current transformers use thick insulation to withstand high voltage, but heat from coil losses is harder to remove. To improve efficiency and reduce load loss, the current density of the winding conductors is controlled below 2.2 A/mm².
The high-voltage winding uses a cylindrical “pagoda” structure to keep the winding stable after vacuum drying and discharge tests. The core is designed with low magnetic flux density (below 1.5 T) to ensure low waveform distortion, and is made of high-quality grain-oriented silicon steel with precise lamination and epoxy reinforcement for tight structure.
The whole transformer adopts a fully insulated enclosure design, using high-density insulating cylinders with excellent moisture resistance and low leakage current. It is filled with No.25 transformer oil, and sealed with high-performance fluororubber gaskets that offer strong resistance to wear, heat, and voltage stress.
All materials are strictly inspected before production. Copper wires are controlled for consistent resistance, and winding parameters such as turns, conductor size, insulation paper, and dimensions are carefully managed to ensure stable performance and high reliability.
Composition Set Parameters
GLB-30/0.38/0.38 Isolation Transformer
| Item | Specification |
|---|---|
| Model | GLB-30/0.38/0.38 |
| Structure Type | Metal enclosure, dry-type |
| Phase | Single-phase |
| Rated Frequency | 50 Hz |
| Rated Capacity | 30 kVA |
| Input Voltage | 380 V |
| Input Current | 79 A |
| Output Voltage | 380 V |
| Output Current | 79 A |
| Waveform Distortion | ≤3% |
| Cooling Method | Natural air cooling |
TEDGC-30/0.38/0～0.42 Column Voltage Regulator
| Item | Specification |
|---|---|
| Model | TEDGC-30/0.38/0～0.42 |
| Phase | Single-phase |
| Frequency | 50 Hz |
| Capacity | 30 kVA |
| Input Voltage | 0.38 kV |
| Input Current | 79 A |
| Output Voltage | 0～0.42 kV |
| Output Current | 71.4 A |
| Waveform Distortion | ≤3% |
| Initial Voltage | ≤3% |
TAWF-100/400 Capacitive Voltage Divider / Coupling Capacitor
| Item | Specification |
|---|---|
| Model | TAWF-100/400 |
| Frequency | 50 Hz |
| Capacitance | 400 pF |
| Rated Voltage | 100 kV |
| Voltage Ratio | 1000:1 |
| Measurement Error | ≤0.5% |
| PD Level | ≤2 pC @ 100% voltage |
| Withstand Voltage | 110 kV / 1 min |
| Structure | Oil-paper capacitive, insulated enclosure |
| Function | Voltage divider + coupling capacitor |
GR100-0.3/5 Transformer Protective Resistor
| Item | Specification |
|---|---|
| Model | GR100-0.3/5 |
| Rated Voltage | 100 kV |
| Rated Current | 0.3 A |
| Resistance | 5 kΩ |
| PD Level | ≤2 pC |
| Structure | Epoxy cylinder, nichrome wire wound |
| Features | Anti-discharge, shielding rings included |
AC-2020 Control Unit
| Item | Specification |
|---|---|
| Model | AC-2020 |
| Meter Accuracy | Class 0.5 (HV measurement) |
| Protection | Overcurrent, zero-voltage trip |
| Voltage Control | Synchronous AC motor |
| Safety | Interlock door protection |
| Functions | Timing, auto reset, breakdown protection |
| Indicators | HV voltmeter, current meter, regulator meters, status lights |
| Accessories | Control & measuring cables included |
LBQ-30/0.4 Noise Filter
| Item | Specification |
|---|---|
| Model | LBQ-30/0.4 |
| Capacity | 30 kVA |
| Voltage | 0.4 kV |
| Circuits | 2 |
| Frequency | 50 Hz |
| Attenuation | ≥40 dB (40–100 kHz), ≥50 dB (100 kHz–1 MHz) |
| Operation | Continuous with test transformer |
RDSBP-30/0.4 Triple Frequency Transformer
| Item | Specification |
|---|---|
| Model | SBF-30/0.4 |
| Structure | Oil-immersed metal enclosure |
| Phase | 3-phase input / 1-phase output |
| Capacity | 30 kVA |
| Input Voltage | 380 V (3-phase) |
| Input Current | 45.5 A |
| Output Frequency | 150 Hz |
| Output Voltage | 400 V |
| Output Current | 43.3 A |
| Waveform Distortion | ≤3% |
Partial Discharge Detector
| Item | Specification |
|---|---|
| Capacitance Range | 6 pF – 250 μF |
| Sensitivity | < 0.02 pC (50 pF sample) |
| Display | Color screen, dual waveform display |
| Functions | Waveform hold, auto frequency detection |
| Frequency Bands | 9 selectable bands |
| Output | Direct apparent charge measurement after calibration |
| Application | Wide range PD testing for various samples |
