LDJB-903 three-phase relay protection tester is a high-performance and multifunctional power testing equipment designed specifically for the debugging and calibration of various relays and protection devices. This tester supports four phase voltage and three-phase current output, covering the testing needs of various devices such as traditional relays, microcomputer protection, transformer differential protection, and backup automatic switching devices. It complies with the national standards GB/T 7261-2016 and DL/T 624-2010, and is suitable for on-site testing, laboratory verification, and equipment factory inspection of power systems. It is a core tool for maintenance and safety assurance in the power industry.
| AC current output | |
| Phase current output (effective value) | 0~40A |
| Output Precision | 0.2 degree |
| A Long-time Phase current | 10A |
| Maximum output power of Phase current | 450VA |
| Maximum output power of 3 parallel current | 900VA |
| Maximum Permitted work time of 3 parallel current | 10S |
| Frequency range ( fundamental) | 0~1000Hz |
| Harmonic time | 0~20 |
| DC current output | |
| Current output | 0～±10A / phase, 0～±30A / 3 parallel |
| Output Precision | 0.5 degree |
| AC voltage output | |
| Phase voltage output (effective value) | 0~120V |
| Output Precision | 0.2 degree |
| Line voltage output (effective value) | 0~240V |
| Phase voltage / Line phase output power | 80VA / 100VA |
| Frequency range (fundamental) | 0~1000Hz |
| Harmonic time | 0~20 |
| DC voltage output | |
| Phase voltage output range | 0～±160V |
| Output Precision | 0.5 degree |
| Line voltage output range | 0～±320V |
| Phase voltage / Line phase output power | 70VA / 140VA |
| 10 path digital input and 8 path digital output | |
| Time measuring range | 0.1ms ～ 9999s |
| accuracy of measurement | ＜0.1ms |
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Supporting over 20 testing modules including AC/DC testing, frequency testing, synchronization testing, differential protection testing, etc., to meet the full scenario testing requirements from basic relays to complex microcomputer protection.
Built in GPS synchronization function (optional), supporting remote multi machine synchronization and swapping, improving the efficiency of large-scale system testing.
Adopting DSP+FPGA core architecture and 16 bit DAC technology, the output waveform density reaches 2000 points per week, ensuring a fundamental wave accuracy of 0.2%.
High fidelity linear amplifier design, balancing low current accuracy and high current stability, supporting three-phase parallel output of 90A high current (lasting for 5 seconds).
Equipped with a 10.4-inch LED true color display screen and Windows XP embedded system, supporting touchpad and external keyboard/mouse operation, the interface is intuitive and easy to use.
The software self calibration function avoids hardware adjustments and improves long-term stability; Test results automatically generate reports, supporting data storage and printing.
Strictly following safety regulations, equipped with overcurrent, overvoltage, short-circuit protection, and current/voltage short-circuit indication functions to ensure the safety of the testing process.
Independent DC auxiliary power output (110V/220V), providing power for external protection devices to avoid external power interference.
Supports USB 2.0 and Ethernet communication, can connect to laptops or industrial computers, has strong software compatibility, and meets diverse testing needs.
Provide multiple wiring modes (such as 0 °, 90 ° wiring) and sequence component switching function to adapt to the testing logic of different protection devices.
