μMPS4000-230B Microcomputer Transformer Backup Protection Device Technical and Operating Manual. The main functions are composite voltage locked overcurrent protection, zero-sequence overcurrent protection, zero-sequence overvoltage protection, inter-phase zero-sequence overcurrent protection, overload protection, PT line break detection and alarm, backup protection tripping output application description, protection logic, fault recording, manual separation and closing operation, AC energy measurement, pulse energy measurement, software calibration of measurement channels, SOE record, hardware description, and operation circuit.
The MPS4000 series is a comprehensive substation automation solution that integrates protection, measurement, and control functions. It includes a range of micro‑processor based protection devices such as AMPS 4100‑4290 series and management units, all designed for 35 kV–110 kV substations.
The manual provides detailed descriptions of system functions, protection principles, parameter settings, hardware wiring, panel operation, and troubleshooting procedures, including trip, close, fault reset, and local remote switching operations. This manual is written in Chinese.
| Relative humidity range | 5 %–95 % |
|---|---|
| Atmospheric pressure | 86–106 kPa |
| Rated AC voltage | 220 V ±15 % (single phase) |
| AC frequency | 50 Hz |
| Power consumption | ≤10 W |
| Current protection range | 0.5 A–100 A |
| Voltage protection range | 2 V–100 V |
Press the 【事故复位】 key; if an accident is present, the system will reset, otherwise it will display a message that no accident is active.
The rated voltage is single‑phase 220 V with a tolerance of ±15 %.