China GCS Low-Voltage Withdrawable Switchgear - Leading Suppliers & Factory for Reliable Power Solutions
The basic technical parameters are shown in Table 1.
Main Circuit Scheme: The main circuit scheme of the device consists of 32 sets of 118 specifications (refer to Table 2), excluding derived schemes and specifications resulting from changes in the control and protection of the auxiliary circuit. It includes the needs of power generation, supply and other power users, with a rated operating current of 4000A, suitable for the selection of distribution transformers of 2500KVa and below. In addition, capacitor compensation cabinets are designed to meet the needs of improving power factor for power supply and demand, taking into account the need for comprehensive investment reactor cabinet.
Rated Voltage of Main Circuit (V) |
AC 380(400)、(660) |
|
Rated Voltage of Auxiliary Circuit (V) |
AC 220、380(400) DC110、220 |
|
Rated Frequency (Hz) |
50(60) |
|
Rated Insulation Voltage (V) |
400(66a) |
|
Rated Current (A) |
Horizontal Busbar |
≤4000 |
Vertical Busbar (MCC) |
1000 |
|
Rated Short-Time Withstand Current of Busbar (kA/1s) |
50, 80 |
|
Rated Peak Withstand Current of Busbar (kA/1s) |
105, 176 |
|
Power Frequency Test Voltage of Busbar (V/1min) |
Main Circuit |
2500 |
Auxiliary Circuit |
1760 |
|
Three-Phase Four-Wire System |
A.B.C.PEN |
|
Busbar |
Three-Phase Five-Wire System |
A.B.C.PE.N |
Protection Level |
IP30, IP40 |
|
Auxiliary Circuit Scheme: The GCS Auxiliary Circuit Catalog contains a total of 120 auxiliary circuit schemes, divided into two volumes. The upper volume, "AC Operation Section," consists of 63 schemes, while the lower volume, "DC Operation Section," comprises 57 schemes.
The auxiliary circuit schemes in the DC Operation Section are primarily used for the low-voltage plant (station) auxiliary systems of power plants and substations. They are suitable for general control methods for standby power supply incoming lines, power supply feeder lines, and motor feeder lines for units with capacities of 2X0MW and below, as well as 300MW and above.
The auxiliary schemes in the AC Operation Section are primarily used for the low-voltage systems of substations in industrial and mining enterprises, as well as high-rise buildings. There are six combination schemes suitable for dual power operation control, and there are no control circuits for operation electrical interlock, standby automatic transfer, or automatic restoration. These schemes can be directly adopted in engineering design.
The DC control power supply is DC 22V or 110V, and the AC control power supply is AC 380V or 220V, forming a complete set cabinet composed of drawer units. The 22V control power supply is derived from the dedicated control transformer inside this cabinet. The common control power supply adopts a non-grounding control transformer, leaving a 24V power supply for use when weak signal lights are needed.
The installation location of the energy meter, the method of voltage introduction, and other installation and usage requirements are detailed in the "Preparation Instructions" of the auxiliary circuit diagram.
The busbar (the combination form of the main busbar can be seen in Appendix 4, Appendix 15) is equipped with the TMY-T2 series hard copper busbar for the purpose of enhancing the dynamic thermal stability of the busbar and improving the temperature rise of the contact surface. The connection parts of the busbar must be tinned, and it is recommended to use full-length tinning. Alternatively, the full-length silver-plated copper busbar can also be selected.
The horizontal busbar is located in the busbar compartment at the rear of the cabinet. For ratings of 3150A and above, it is arranged in a double-layer configuration, while for ratings of 2500A and below, it is arranged in a single-layer configuration. Each phase consists of 4 or 2 busbars, significantly improving the short-circuit strength of the busbar.
Please refer to Table 3 for the selection of copper busbars for the horizontal busbar installation.
| Rated Current (A) | Copper Busbar Specification (mm) |
|---|---|
630 – 1250 |
2(50×5) |
1600 |
2(60×6) |
2000 |
2(60×10) |
2500 |
2(80×10) |
3150 |
2×2(60×6) |
4000 |
2×2(60×10) |
| General Cabinet Code | A | B | C | D | Remarks |
|---|---|---|---|---|---|
GCS-TG1010-4 |
1000 |
1000 |
850 |
956 |
Interlocking Cabinet |
GCS-TG0810-4 |
800 |
1000 |
650 |
956 |
Receiving Cabinet |
GCS-TG0808-4 |
800 |
800 |
650 |
756 |
Receiving Cabinet |
GCS-TG0608-4 |
600 |
800 |
450 |
756 |
Receiving Cabinet |
| General Cabinet Code | A | B | C | D | E | F×G |
|---|---|---|---|---|---|---|
GCS-TG1010-2 |
1000 |
1000 |
850 |
956 |
60 |
400×400 |
GCS-TG0810-2 |
800 |
1000 |
650 |
956 |
160 |
200×400 |
GCS-TG1008-2 |
1000 |
800 |
850 |
756 |
60 |
400×400 |
GCS-TG0808-2 |
800 |
800 |
650 |
756 |
160 |
200×400 |