1. Introduction

type LW24- /T outdoor H.V. AC dead tank SF6 gas circuit breaker is a new type of self-detonating interrupter and spring operating mechanism circuit breaker, which is the basis of the technology of imported products from Mitsubishi, Japan. The latest arc extinguishing principle is realized by adopting the gas blast pressure adapted to the current interruption. By this method, most of the energy required to break the rated short-circuit current comes from the arc itself. Therefore, the demand for operating power is greatly reduced. The three pole circuit breakers are placed in three metal enclosures, respectively. The circuit breaker can be mechanically operated in three-phase linkage. Both remote electrical control and local manual control can be achieved. CT20-II spring operating mechanism, is a low operating power, the maintenance work required at least, high reliability of the mechanism. Products in the main technical performance reached the international advanced level.

LW24- 145/T passed the prototype appraisal of the former Ministry of Machinery Industry, Ministry of Electric Power Industry and State Science and Technology Commission in December 2008.

2, normal use state

2.1. Altitude: ≤ 3000m

2.2. Humidity per month: ≤ 90%
2.3.Max. Wind speed: ≤ 35 m/s
2.4. Pollution grade: IV
2.5. Ambient air temperature:-35 ℃ ~ 40 ℃ (it is satisfied under the condition of -40 ℃ in severe cold area)
2.6.Max. Daily temperature difference: 25K
2.7. Seismic bearing density: 9 degrees
2.8. Ice coating: ≤ 10mm
2.9. Solar radiation maximum: 1000W/m2
Note: When the product is used under conditions beyond the above range, the user and the manufacturer should consult to confirm.

3. Specifications

4, the main features and advantages:

4.1. Due to the excellent electric field design and its perfect coordination with the motion characteristics, the open circuit capacitor current may not produce a re-strike. For dedicated circuit breakers used to switch capacitive loads, the breaking current of back-to-back capacitor banks may be as high as 1500 ~ 2000A.

4.2. The gas flow characteristics are very suitable, and its open circuit induced current has no chopper overvoltage. As
For special circuit breakers used to switch inductive loads, the switching current of the shunt reactor may be as high as 1500 ~ 2000A.

4.3. When disconnecting the rated short-circuit current and any fault current, there is a reliable disconnection performance and
Enriched arc-extinguishing time difference by applying the arc-extinguishing principle of gas blast pressure adaptation
Disconnect the current.

4.4. Has excellent insulation properties and a wide range of internal insulation margin. For a 40.5kv product, the insulation class corresponds to 72.5kv, which is used to reduce the voltage.

4.5. The duration of the rated short-time withstand current is up to 4 seconds.

4.6. Due to the high strength of the porcelain, the horizontal configuration of the arc chamber center of gravity is low, the product has a high seismic performance, seismic density of 9 degrees.

4.7. The product is fully equipped with the latest advanced CT20 spring operating mechanism. Therefore it has low
High noise level, mechanical reliability and mechanical three-phase linkage operation, and requires less space
Occupancy, compared with ordinary single-phase operating circuit breakers, especially suitable for urban power
Network and rural power grid renovation projects.

4.8. After a comprehensive routine test in the factory, each circuit breaker is packaged in a monolithic form and filled with 0.05mpa of SF6 gas in the arc extinguishing chamber. The site only needs some SF6 gas connection and refill, you can save commission. Maintenance work is minimized, which only requires checking the SF6 gas meter and applying lubricant.

4.9. The design of the frame makes the product especially suitable for the renovation project of bulkhead replacement
Circuit breakers, such as DW8-35 type, DW13-35 and DW2-35, etc., bulk oil circuit breakers, without foundation
Reconstruction. The middle frame on the bracket of the LW24-40.5 SF6 gas dead box circuit breaker is special
The design allows the product to be installed directly on the original foundation of the previous loose oil circuit breaker. Therefore
The workload of the renovation project is greatly reduced and the project cycle is shortened.