From Structure To Application: An In-depth Analysis Of The Technical Parameters Of The 25kV/630A Dual-Position Load Switch

In power system, double-position load switch is an important control device, which is responsible for opening and closing load current, and ensures the safe and stable operation of power grid. Among them, the 25kV/630A dual-position load switch has attracted a lot of attention for its wide range of applications and excellent performance. In this paper, the key equipment is analyzed in detail from several angles, such as structural features, technical parameters and application scenarios.
I. Structural Characteristics
The 25kV/630A dual-position load switch usually employs advanced arc extinguishing techniques, such as vacuum arc extinguishing or SF6 gas arc extinguishing, to ensure reliable arc extinction during load current interruptions and to prevent arc reignition and equipment damage. Take vacuum arc extinguishing as an example. Its arc extinguishing chamber works in a high vacuum environment and utilizes arc diffusion and metal vapor condensation in vacuum to extinguish arc. This method has the advantages of long electrical life, many interruptions and strong closing capacity.
In terms of structural design, dual-position load switch combines multiple functions, such as body type, load switch and earthing switch switch, and occupies a small area. For example, some types of load switches have series of direct isolation circuit breakers and vacuum arc extinguishing chambers. They have high dynamic and thermostable current parameters, and have a unique linkage function to operate in a specific sequence, allowing all operations to be performed at once. This greatly improves ease of operation and security.
In addition, the dual-position load switch is equipped with a complete mechanical interlocking device, such as "Fiveproof" mechanical interlock, to prevent mishandling and ensure the safe operation of the device. Its operating mechanism is flexible, allowing manual and motor operation, which facilitates the realization of the "three distances" (remote control, remote signaling and remote measurement) requirements of power system.
ii. Technical Parameters
The technical parameters of the 25kV/630A dual-position load switch are an important indicator of its performance. The following is a detailed analysis of its main technical parameters:
Rated Voltage: 25kV. This parameter represents the standard voltage at which a load switch can be continuously operated, taking into account the fluctuation range of operating voltages of the power system to ensure stable operation under a variety of working conditions.
Rated: 630A. This parameter represents the long-term working current allowed by load switches and is an important basis for equipment selection. Under rated current, the load switch can reliably open and close load currents to meet the demands of the power system.
Short-term rated current tolerance: 20 kA (4 seconds). This parameter reflects the capacity of load switches to withstand short-circuit currents in a short period of time. When a short circuit occurs in a power system, the load switch can withstand the shock of short-circuit circuit current for a specified period of time, thus buying time for the operation of the protective device.
Rated Peak Withstand Current: up to 50kA. This parameter further demonstrates the tolerance of load switches under extreme conditions. It indicates the maximum current peak that load switches can withstand in a short circuit, which is an important guarantee of equipment safety.
Disruption capacity: includes the ability to interrupt active load currents current, closed loop current, empty transformer current and cable charging current. These parameters illustrate the outage performance of load switches under various working conditions and ensure their wide application in power system.
III. Application Scenarios
the 25kV/630A dual-position load switch plays an important role in power system due to its excellent performance and wide range of applications. It is mainly used in urban distribution grid, industrial facilities and renewable energy sectors as a zoning switch for power lines, a control switch for user access or a protection device for power transformers.
In urban distribution network, load switches are usually used in loop main unit and cable branch boxes to achieve flexible load distribution and rapid fault isolation. In industrial facilities, equipment is isolated employing load switches to ensure the safety of equipment maintenance and repair operations. In the field of renewable energy such as photovoltaic (PV) and wind power, load switches also play a crucial role in ensuring the safe and stable operation of renewable energy generation systems and the reliability of grid-connected generation.