The ambient air temperature shall not be higher than +40°C and not lower than -5°C. The average temperature within 24 hours shall not be higher than +35°C. If it exceeds this range, the equipment shall be operated with reduced capacity according to the actual situation.
It is for indoor use, and the altitude of the installation site shall not exceed 2000m.
The relative humidity of the ambient air shall not exceed 50% at the maximum temperature of +40°C. A higher relative humidity is allowed at lower temperatures, for example, 90% at +20°C. The influence of occasional condensation due to temperature changes shall be taken into account.
The inclination of the device from the vertical plane during installation shall not exceed 5°, and the entire cabinet row shall be relatively level (in line with the GBJ232 - 82 standard).
The device shall be installed in a place without severe vibration and impact, and where the electrical components will not be subject to undue corrosion.◇ When the user has special requirements, it can be negotiated with the manufacturer for a solution.
Main Circuit Schemes
There are a total of 32 groups and 118 specifications of main circuit schemes for GCS cabinets, excluding the schemes and specifications derived from the changes in the control and protection of the auxiliary circuits. These schemes meet the needs of power generation, power supply and consumption, and other power users. The rated operating current is 5000A, suitable for distribution transformers of 2500KVA and below. In addition, capacitor compensation cabinets are designed to meet the need of improving the power factor in power supply and consumption, and reactor cabinets are designed considering the need for comprehensive investment.
◆ Auxiliary Circuit Schemes
The GCS auxiliary circuit diagram atlas has a total of 120 auxiliary circuit schemes, divided into two volumes, upper and lower. The upper volume, "AC Operation Part", has 63 schemes in total, and the lower volume, "DC Operation Part", has 57 schemes. The auxiliary circuit schemes in the DC operation part are mainly used in the low - voltage auxiliary power systems of power plants and substations. They are suitable for the low - voltage auxiliary power systems of units with a capacity of 200MW and below and 300MW and above, and the general control modes of the incoming lines of working (standby) power supplies, power feeders, and motor feeders.
The auxiliary schemes in the AC operation part are mainly used in the low - voltage systems of substations in factories, mines, enterprises, and high - rise buildings. There are 6 combined schemes suitable for the operation control of dual power supplies. Control circuits such as electrical interlocking for operation, automatic transfer of standby power, and automatic restoration are provided, which can be directly adopted in engineering design. The DC control power supply is 220V or 110V DC, and the AC control power supply is 380V or 220V AC. The switchgear is composed of drawer units. The 220V control power supply is taken from the common control power supply supplied by a specially - set control transformer in the cabinet. The common control power supply uses a non - grounded control transformer, and a 24V power supply is reserved for the use of weak - current signal lights. For details of the installation location of the watt - hour meter, the method of introducing voltage signals, and other installation and use requirements, please refer to the "Compilation Instructions" of the auxiliary circuit diagrams.
◆ Main Busbars
To improve the dynamic and thermal stability of the busbars and reduce the temperature rise of the contact surfaces, all equipment uses TMY - T2 series hard copper bars. The copper bars are tin - plated over the entire length, and silver - plated copper busbars over the entire length can also be selected.
