Current protection unit
Current protection unit CPU is designed for integration into mine set electrical equipment (compact stations and control stations) and start-protection apparatus with voltage up to 1140 V of alternate current and frequency 50 Hz, which functions as a safety device protecting three-phase power consumers against overcurrent, short-circuit failures and phase distortion by switching them off supply network.
The unit can be designed in the following versions:
CPU-01 — for integration into mine set electrical equipment;
CPU-02 — for integration into mine start-protection apparatus.
Electrical equipment and apparatus with the integrated unit are to have minimum ingress protection rating lP54. The unit is intended for operation in cold-temperature climatic regions and is produced in the version MCC (moderately cold climate) category 5 according to State Standard 15150-69.
The unit provides actuating relay disconnection when the actual current value exceeds maximum current protection setting and causes short-term (maximum 1 s) supply voltage rise up to 150% from the rated voltage.
Basic specifications:
Parameter | Value | |
CPU-01 | CPU-02 | |
Power supply voltage, V | 42 | 36 |
Supply network frequency, Hz | 50 | |
Rated wattage, W | 3 | |
Dimensions, mm (max) | 122x40x126 | 120x63x132 |
Maximum weight, kg | 0.3 | 0.4 |
Operational mode — continuous | S1 | |
Operational delay of maximum current protection, ms | 25-225 | |
MCP (maximum current protection) setting index | 3 — 12 | |
Maximum automatic return time of CPU diagram to initial condition upon overcurrent protection response, min | 4 | |
Maximum voltage switched by alternate current actuating relay contacts, V | 60 | |
Minimum current switched by actuating relay contacts, A | 2 | |
Ingress protection rating | lP 30 | |
Ambient temperature, ° C | from — 10 to + 35 | |
Relative air humidity at the maximum temperature (35±2)° C, % | 98±2 | |
Maximum altitude above sea level, m | 1000 | |
Minimum average error-free running time, h | 10000 | |
Minimum average operating life, years | 6 | |
Examples of unit order record
“Current protection unit CPU-01 TU BY 600175052.006-2005”;
“Current protection unit CPU-02 TU BY 600175052.006-2005”.
See also
