3 Phase Relay Protection Tester
The ZWJD903 is an advanced 3 phase relay protection tester offering 4-phase voltage and 3-phase current outputs.
Integrated with a DSP and FPGA control system, it ensures high-precision automatic testing for both traditional relays and modern microcomputer protection devices.
Product Overview
The ZWJD903 3 Phase Relay Protection Tester is a comprehensive secondary injection tester designed for calibrating a wide range of electrical relays and microcomputer protection systems.
By utilizing advanced DSP digital signal processing and high-fidelity linear power amplifiers, it delivers exceptional waveform quality for precise fault simulation, differential testing, and transient analysis.
Suitable for power grids, substations, and industrial facilities, this equipment significantly improves field testing efficiency while fully complying with the DL/T 624-1997 standard.
Functions and Value:
1. Comprehensive Protection Testing: Equipped with standard 4-phase voltage (120 V/phase) and 3-phase current (30 A/phase) outputs to satisfy the rigorous testing demands of differential relays, distance protection, and standby automatic switching devices.
2. High-Fidelity Signal Generation: Incorporates a DSP+FPGA core combined with a 16-bit DAC, generating up to 2000 high-density sine waves per cycle for superior accuracy and stability during both fundamental and harmonic testing.
3. Independent DC Auxiliary Source: Features a built-in dedicated DC auxiliary power supply offering 110 V and 220 V outputs, effectively powering external protection devices directly without the need for additional equipment.
4. Intelligent Software Calibration: Integrated with automatic software self-calibration technology, eliminating the need to open the case for manual potentiometer adjustments and ensuring long-term testing reliability.
5. Integrated Industrial Computer: Features an embedded Windows operating system with a high-resolution TFT color display, providing engineers with a seamless and reliable standalone testing experience on-site.
6. Robust Linear Power Amplifier: Uses direct-coupled high-performance linear amplifiers to guarantee stable large-current output and precise small-current control, backed by comprehensive overheat and short-circuit protection circuits.
Technical Details
| Parameter | Specification |
|---|---|
| Model | ZWJD903 |
| AC Current Output | 0~30 A/phase, 0~90 A (three-phase parallel) |
| AC Voltage Output | 0~120 V/phase, 0~240 V (line voltage) |
| DC Current Output | 0~±10 A/phase |
| DC Voltage Output | 0~±160 V/phase, 0~320 V (line voltage) |
| Output Frequency | 0~1000 Hz |
| Frequency Accuracy | 0.01 Hz |
| Phase Range | 0~360° |
| Harmonic Output | 2nd to 20th harmonic |
| Time Measurement | 1 ms~9999 s |
| Power Supply | AC 220 V ±10%, 50/60 Hz |
| Weight | Approx. 12.5 kg |
Model Selection Guide
| Model | Rated Voltage (Peak) | Maximum Load Capacity | Key Difference |
|---|---|---|---|
| ZWVLF-30 | 30kV | 0.1Hz ≤ 0.5µF, 0.01Hz ≤ 5.5µF | Basic configuration for lower voltage |
| ZWVLF-40 | 40kV | 0.1Hz ≤ 0.5µF, 0.01Hz ≤ 5.5µF | Extended voltage range |
| ZWVLF-50 | 50kV | 0.1Hz ≤ 0.5µF, 0.01Hz ≤ 5.5µF | Suitable for 10kV cable testing |
| ZWVLF-60 | 60kV | 0.1Hz ≤ 0.5µF, 0.01Hz ≤ 5.5µF | Includes auxiliary external cylinder |
| ZWVLF-80 | 80kV | 0.1Hz ≤ 0.5µF, 0.01Hz ≤ 5.5µF | Standard for 35kV cable testing |
| ZWVLF-90 | 90kV | 0.1Hz ≤ 0.5µF, 0.01Hz ≤ 5.5µF | Maximum capacity testing |
Recent Work
Parts List
| Item NO. | Max Current | Measuring Range | Main Features | Recommended Application |
|---|---|---|---|---|
| GDZR-10A | 10A | 100μΩ - 20KΩ | Portable, built-in discharge alarm | Small to medium distribution transformers |
| GDZR-20A | 20A | 10μΩ - 10KΩ | High-speed testing, heat dissipation | Medium-sized power transformers |
| GDZR-40A | 40A | 1μΩ - 2KΩ | Dual-channel measurement, high current | Large-scale power transformers |
| GDZR-40A | Three-Phase 10A | 100μΩ - 10KΩ | Three-phase simultaneous measurement | Yn-type transformers, time-saving |
Product Video
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Certificate
Frequently Asked Questions
Contact our engineers for technical support and application guidance.
It can test a wide variety of traditional relays and modern microcomputer protections, including transformer differential protection, distance protection, and standby automatic switching devices.
No, the device features a built-in high-performance industrial computer with a Windows operating system and TFT display, though it also supports connection to an external laptop via USB if preferred.
The tester can deliver up to 120 V per phase for AC voltage (240 V line voltage) and up to 30 A per phase for AC current, which can be connected in parallel for a maximum of 90 A.
Yes, the system can generate from the 2nd up to the 20th harmonic on the fundamental wave, making it highly suitable for verifying proportional and harmonic braking characteristics.
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