Product introduction
In the power system, the Medium voltage switchgear (Medium Voltage switchgear) is the key hub connecting high-voltage transmission and low-voltage power distribution, and is usually responsible for the distribution and control of electrical energy in the voltage range of 3kV to 40.5kV.If the transformer is compared to the heart, the switchgear is the "joint" and "gate" that control the direction of blood flow. Its core task is to divide the circuit during normal operation, and in the event of a short circuit or overload, cut off the fault current in milliseconds to protect the safety of expensive equipment and lines.
A brief analysis of the working principle
The working logic of the medium voltage switchgear can be summarized as three functions "Switching, protection, and isolation":
01
Switching
Through circuit breakers or load switches, the circuit is turned on or off under normal or fault conditions to realize the distribution and control of electrical energy.
02
Protection
When the system is overloaded, shorted, or grounded, the current transformer (CT) and voltage transformer (PT) transmit signals to the relay protection device, which quickly instructs the circuit breaker to trip and isolate the fault area.
03
Isolation
Through the isolation switch or grounding switch, the equipment to be repaired is completely separated from the live part and grounded to ensure the personal safety of the operation and maintenance personnel.
Product Advantages
Combined with Kechang Electric's technical accumulation in the field of high-voltage/medium-voltage complete equipment, our medium-voltage switchgear products reflect the following advantages in the design:
Sturdy armored structure
The cabinet body is made of high-quality aluminum-zinc plate or cold-rolled steel plate processed and formed by CNC equipment, and metal partitions are used to completely isolate the compartments. This "metal armor" design can effectively prevent the spread of faulty arcs and ensure that even if a unit fails, it will not spread to other circuits.
01
Perfect "five-proof" interlocking
The core of safety is to prevent human misoperation. Kechang switchgear is equipped with strict mechanical and electrical interlocking devices, which realize the classic "five-proof" functions: to prevent the isolation switch from being pulled with load, to prevent the circuit breaker from being separated by mistake, to prevent the live ground wire from being hung, to prevent the ground wire from transmitting power, to prevent straying into the live interval, and to eliminate fatal operating errors from the physical level.
02
Flexible and reliable solution
The product line covers a variety of solutions from traditional air insulation to environmentally friendly gas insulation (C-GIS). For example, our inflatable cabinet uses a stainless steel air tank to seal all high-voltage live parts, which is not affected by the external environment. It is especially suitable for harsh working conditions such as underground and plateau, and it is more compact and space-saving.
03
Durable and intelligent
Adhering to the concept of "durable and reliable", the key components are made of high-specification materials and the quality is controlled through a strict testing process. At the same time, the product supports integrated intelligent monitoring modules, which can collect data such as temperature, local discharge, and gas density in real time, and provide a data basis for unattended and status maintenance.
04
Urban distribution network and commercial complex: As the core equipment of the 10kV/35kV distribution room, it is responsible for the reception, distribution and protection of electrical energy.
Industrial parks and large-scale factories and mines: provide reliable power supply control and short-circuit protection for large-capacity loads such as production lines, fans, pumping stations, etc.
New energy field station: it is used for the collector circuit of wind farms and photovoltaic power plants to realize multi-channel convergence and grid-connected control.
Transportation hub: Used in the power supply system of subways, airports, and railway traction stations, it has extremely high requirements for the continuity of power supply.
Data centers and hospitals: provide dual-loop or multi-loop power supply for primary loads to ensure uninterrupted operation of critical loads.
Product parameters
| Project | Unit | Parameter | ||
| Rated Voltage | KV | 40.5 | ||
| Rated Frequency | HZ | 50 | ||
| Rated Current | A | 630,1250,1600,2000 | ||
| Rated Short Circuit Breaking Current | A | 20,25,31.5 | ||
| Rated Short Circuit Current (Peak) | KA | 50,63,80 | ||
| Rated Dynamic Current (Peak) | KA | 50,63,80 | ||
| 4s Thermal Current (rms) | KA | 20,25,31.5 | ||
| Rated Insulatin Level | Lightning Impulse Withstand Voltage (Full Wave) | KA | 185,215 | |
| Power Trequency Withstand Voltage (1min) | KV | 95,118 | ||
| Protection Level of Cabinet | KV | The protection level of cabinet is IP4X,andthe protection level between each compartment and in the moment when the circuit-breaker room is opened is IP2X. |
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