Products Description
Product Definition and Core Functions
Substation switchgear is the basic equipment used in power systems to control circuit on-off, fault protection and operation monitoring. It integrates key components such as circuit breakers, isolation switches, grounding switches, and transformers into a closed cabinet to achieve accurate distribution of electrical energy. The equipment is widely used in power stations, substations and industrial and mining enterprises.
Core components & Main Functions
The equipment implements four basic functions-control (circuit switching), protection (cutting off short-circuit current), isolation (physical disconnection) and measurement (parameter feedback) to ensure the stable operation of the power system.
Core technical Advantages (verified on-site)
The following advantages are derived from the engineering design in terms of safety, environmental adaptation, and operation and maintenance efficiency, and are designed to solve specific problems in actual operation.
Five-proof interlocking: The dual mechanical and electrical constraints are used to force the equipment to operate in a fixed sequence (for example, to prevent the isolation switch from being combined with the load), and accidents such as "straying into the live interval" are eliminated from the operation level.
Visual fracture: A visible physical gap is formed after the isolation switch is closed, and the maintenance personnel can visually confirm that the line has been powered off to avoid the risks caused by memory or identification judgment.
Safety protection: reduce misoperation and risk
Grounding protection: Within 0.5 seconds after power failure, the grounding switch will automatically close, introducing the residual charge into the ground and eliminating the hidden danger of electric shock.
Fire-proof and explosion-proof structure: The cabinet uses galvanized steel plate or 304 stainless steel with a thickness of not less than 2mm, which complies with IEC fire protection standards and can withstand high temperature and internal arc shocks to prevent accidents from expanding.
Wide temperature zone operation: The equipment can operate normally in an environment of -40℃ to +70℃ (some models are extended to -50℃~+85℃). The conductive parts are silver-plated and equipped with forced heat dissipation measures to control the temperature rise.
Seismic resistance and wind resistance: The cabinet frame has been strengthened and designed, and shock absorption devices have been installed. The seismic resistance level is above 0.3g (in line with IEC standards), which can cope with natural disasters such as earthquakes and typhoons.
High short-circuit tolerance: The short-circuit breaking capacity of the circuit breaker covers 25kA to 80kA (corresponding to the voltage level of 10kV-110kV), can withstand extreme fault current shocks, and protect downstream transformers and lines.
Maintenance efficiency: shorten fault handling time
Remote monitoring: The equipment uploads real-time data to the SCADA system through the IEC 61850 protocol, which can detect early signs of overheating of the contact point in advance.
Accurate alarm: built-in optical fiber temperature measurement, local discharge sensor, etc., can accurately locate the fault point and avoid blind troubleshooting.
Modular design: The core components (such as circuit breakers) adopt a standardized interface, and a single person can complete the replacement within 30 minutes. Compared with traditional switchgear, the average fault repair time is shortened by 60%.
Typical application scenarios (selection reference)
The selection of equipment needs to be combined with the on-site environment and load characteristics.Common scenarios are as follows:
Transmission substations (110kV and above): GIS (gas insulated) cabinets are preferred, which cover a small area and are suitable for deployment in urban areas.
Distribution station (10kV-35kV): AIS (air insulated) cabinets can be selected according to the cost, or mixed insulated cabinets can be selected to balance performance and cost.
Industrial sites
Manufacturing plant: high-current and low-voltage cabinets (630A-4000A) are selected to meet the power supply of heavy-duty equipment such as motor groups and production lines.
Steel/chemical plants: cabinets with IP54 and above protection levels are selected, and the shell is anticorrosive and resistant to high temperature, corrosive gases and dust.
Data center: A complete set of low-voltage switchgear equipped with UPS is used to switch the backup power supply at the millisecond level to ensure that the power supply reliability reaches 99.999%.
Commercial buildings: use intelligent power distribution cabinets to access the building's automatic control system through protocols such as Modbus to manage energy consumption for lighting, air conditioning and other loads.
New energy
PHOTOVOLTAIC/wind farm: choose an anti-harmonic GIS cabinet with a built-in filter module to suppress the high-frequency harmonics generated by the inverter and avoid power grid pollution.
Energy storage system: fast circuit breaker (opening time ≤5ms) is used, and the dynamic monitoring module is used to adjust the charging and discharging strategy according to the battery status (SOC, temperature) to extend battery life.
The core value of substation switchgear lies in solving the safety and stability problems in power distribution through reliable structural design and mature protection mechanisms. When selecting the model, the voltage level, environmental conditions and operation and maintenance requirements should be considered in order to achieve the goals of safety, reliability and ease of use. For specific parameters, please contact the technical department for detailed information.
Product Parameters
| Project | Unit | Parameter | ||
| Rated voltage | KV | 3,6,10 | ||
| Rated frequency | HZ | 50 | ||
| Maxinum working voltage | KV | 3.6,7.2,12 | ||
| Rated current | A | 630 | ||
| Load switch | Rated current | A | 630 | |
| Electrial life at rated current | TIME | No less than 100 | ||
| Breaking load transformer capacity | KVA | 1250 | ||
| Rated thermal current | KA | 20 | ||
| Rated short circuit current(peak) | KA | 50 | ||
| Rated dunamic current | KA | 50 | ||
| Fuse rated current | KA | 100 | ||
| Rated transfer current | KA | 1500,2000 | ||
| Rated short circuit breaking current | KA | 31.5 | ||
| Models equipped with fuses | KA | S□LAJ-12/XRNT□-10 | ||
| Rated insulation level | Lightning impulse withstand voltage(full wave) | 75,85 | ||
| Power frequency withstand voltage(1min) | KV | 42,48 | ||
| protection level of cabinet | IP3X | |||
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