Outdoor High-Voltage AC Sulfur Hexafluoride Circuit Breaker LW-252/4000-50 from China manufacturer

The LW-252/4000-50 type self-energy AC high-voltage sulfur hexafluoride circuit breaker is an outdoor product, applicable to the AC 50Hz power grid with a maximum voltage of 252kV in areas with an altitude not exceeding 2000m, an ambient temperature not lower than -30℃ and a pollution class not higher than Class IV. It is used to interrupt the rated current and fault current, or switch circuits, so as to realize the control and protection of the power system, and can also be used as an interconnection circuit breaker.

This product adopts SF6 gas as the arc-extinguishing and insulating medium, and uses world leading self-energy arc-extinguishing technology, equipped with a new type of spring operating mechanism. It features long electrical life, low operating work, low noise and high reliability, with a simple structure, small volume and long maintenance-free period. In the current trend of oil-free and large-capacity power equipment, it can completely replace the same type of imported products.

1. The circuit breaker adopts a three-phase porcelain-column type single-break structure, with one spring operating mechanism configured for each phase and three-phase electrical interlock, boasting a novel and exquisite appearance.

2. SF₆ gas is used as the insulating and arc-extinguishing medium for the circuit breaker, and a pointer-type density relay is adopted to monitor its pressure and density. Based on the self-energy arc-extinguishing principle and with the optimized design of the breaker's motion system, the mechanical efficiency is effectively improved and the operating work is reduced to the maximum extent.

3. Excellent breaking performance and long electrical service life.

4. Each pole of the product is mounted on a mechanism box, which is centrally installed on the foundation bolts. The box houses a spring operating mechanism and an electrical control unit, with the output rod of the mechanism connected to the crank arm. The surface of the mechanism box bracket is treated with hot-dip galvanizing process, the fasteners are hot-dip galvanized, and the shell of the mechanism box is made of stainless steel material, endowing the product with excellent corrosion resistance.

5. High mechanical reliability and capable of frequent operation.Benefiting from the inherent high insulation strength of SF₆ gas and the optimal contact movement adopted by the circuit breaker, the breaker realizes no restriking when breaking capacitive current.

6. High external insulation level with a large creepage distance design for external insulation, featuring excellent pollution resistance.High current-carrying capacity: The temperature rise test is conducted at 1.2 times the rated current of 4000A, and there is still a large margin for temperature rise at all points.

The overall product features a compact appearance and structure, facilitating on-site installation and commissioning with low maintenance workload.

Main Technical Parameters of the Mechanism

No	Name		Specification
1	Auxiliary circuit voltage		DC220V, AC220V
2	Opening/closing coil voltage/current		DC110/4; DC220/2.5 V/A
3	Energy storage motor	Rated voltage	DC220V, AC220V
		Normal operating voltage range	85%-110% V
		Power	600W
4	Motor energy storage time		≤15s
5	Heater and lighting circuit voltage		AC220V
6	Auxiliary switch rated voltage		DC220V,AC220V
7	Auxiliary switch rated current		10
8	Number of auxiliary switch contacts		10 NO + NC

Main Technical Parameters of the Circuit Breaker

No	Name			Specification
1	Rated voltage			252KV
2	Rated Power-Frequency Withstand Voltage（1min）		To ground	460
			Between breaks	460+146
	Rated Lightning Impulse Withstand Voltage		To ground	1050
			Between breaks	1050+206
3	Rated Frequency			50Hz
4	Rated Current			4000A
5.	First-Pole-To-Clear Factor			1.3
6.	Rated Short-Circuit Breaking Current			50kA
7	Peak Value of Rated Short-Circuit Making Current			125kA
8	Rated Short-Circuit Withstand Current			50kA
9	Rated Peak Withstand Current			125kA
10	Rated Short-Circuit Duration			3s
11	Rated Out-of-Step Breaking Current			12.5KA
12	Near-Zone Fault Breaking Current			90%IK,75%IK KA
13	Rated Line Charging Making and Breaking Current			200A
14	Rated Operating Sequence			O-0.3S-CO180S-CO
15	Main Circuit Resistance			≤ 55μΩ
16	Rated SF6 Gas Pressure (Gauge pressure at 20℃)			0.6Mpa
17	Alarm / Minimum Functional Pressure (Gauge pressure at 20℃)			0.55±0.015/0.050±0.015
18	Annual SF6 Gas Leakage Rate			≤0.5%
19	SF6 Gas Moisture Content (V/V)			≤150 ppm
20	Mechanical Life			10000times
21	Radio Interference Voltage			＜500 μ∨
22	Creepage Distance	Between breaks		≥8660 mm
23		To ground		≥6900 mm
24	SF6 Gas Filling Weight per Unit			24 kg
25	Weight of Each Circuit Breaker			1500 kg

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