μMPS4220A is the three-phase transformer differential protection device in the μMPS4000 series substation comprehensive automation system, which has ratio differential protection, secondary harmonic locked ratio differential protection, differential fast break, CT line break closure and other functions.
The manual describes the MPS4000 series integrated substation automation system, including its architecture and the family of AMPS protection devices that compose the solution. It outlines the system's hardware, panel layout, and wiring terminals, and explains how the devices communicate via RS‑232 or CAN interfaces.
Detailed sections cover the system's working principles, differential and ratio‑differential protection functions, technical parameters, environmental requirements, and procedures for measurement calibration, accident reset, and remote switching. The document also provides setting tables, fault recording, and software correction methods for accurate protection performance. This manual is written in Chinese.
| Input Power | 220 V AC/DC |
|---|---|
| Rated AC Voltage | 220 V ±15 % – +20 % |
| Power Consumption | ≤ 10 W |
| CT Circuit Power | ≤ 0.3 VA per phase |
| Fast‑Trip Action Time (1.5×) | ≤ 25 ms |
| Ratio‑Differential Action Time (2×) | ≤ 40 ms |
The rated input voltage is single‑phase 220 V with a tolerance of –15 % to +20 %.
The protection unit consumes no more than 10 W, whether powered from AC or DC.