This manual explains operation, specifications, wiring, maintenance and service procedures for the 701/702 microcomputer relay protection tester.
The 701/702 microcomputer relay protection tester, produced by Hezhong Electric, provides AC and DC voltage and current outputs for testing protection relays. The device features a rotary‑mouse interface, multiple output channels, and built‑in harmonic generation.
The manual covers technical specifications, panel description, step‑by‑step operating instructions, PC software usage, troubleshooting, EPROM replacement, and warranty information. This manual is written in Chinese.
| AC phase current output (effective) per phase (701 model) | 0‑30 A |
|---|---|
| Three‑phase current output (effective) (701 model) | 0‑90 A |
| Frequency range (fundamental) (701 model) | 20‑400 Hz |
| AC phase voltage output (effective) per phase (702 model) | 0‑120 V |
| Line voltage output (effective) (702 model) | 0‑240 V |
| Maximum continuous AC current per phase (702 model) | 10 A |
| Dimensions | 400 × 300 × 180 mm |
| Weight | 16 kg |
The tester can output up to 120 V AC per phase.
Turn off the device, lay it flat, open the top cover to locate the EPROM chip on the main board, gently pry it out with a small screwdriver, insert the new EPROM in the same orientation, close the cover and power the unit back on.
Inspect the two 2 A fuses above the power input socket for continuity.