Substation EquipmentLow Voltage switchgear
(1)Power center
The power center is a low-voltage metal-enclosed switchgear that supplies power to low-voltage large- capacity (over 75kW) electrical motors and control centers. The chambers are divided for each load, and the ACB (Air Circuit Breaker) with over current relay opens/closes and protects the electrical circuit.
Feature
- Busbar is covers by insulated tube to prevent internal short-circuit fault.
- ACB can be drawn-out by hand stacker for easy inspection and maintenance.
Main ratings
| Applicable standard | JEM-1265 |
|---|---|
| Rated voltage [V] | 460/480 (3-phase) |
| Rated normal current [A] | 1200, 2000, 3000, 4000 |
| Rated short-time current [kA] | 40 or 50 (1sec) |
(2) Control Center
The control center is a low-voltage metal-enclosed switchgear for opening/closing and protection for low- voltage electrical motors and various loads. The main circuit breaker, protection device, control switch, etc. are unitized for each circuit and are built into the cabinet as a stack.
Feature
- The unit construction allows for flexible connection to various types of loads.
- The operation handle of the circuit breaker is equipped with mechanical interlock for safety.
- Each unit can be drawn-out easily for easy maintenance and inspection.
Main ratings
| Applicable standard | JEM-1195 |
|---|---|
| Rated voltage [V] | 200/220 or 400/440 (3-phase) |
| Rated normal current [A] | Horizontal: 630～2000 Vertical: 630 |
| Rated short-time current [kA] | 30 or 50 (0.5sec) |
| Maximum unit stack number | 8 units for single side |