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LW39-126 Outdoor AC High-Voltage SF6 Circuit Breaker

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High-voltage switchgear

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Detailed introduction Technical specifications

The LW39-126 outdoor AC high-voltage porcelain-pole SF6 circuit breaker is designed for use in power systems with a frequency of 50 Hz and a rated system voltage of 110 kV. It serves as a key piece of electrical equipment in power plants and substations, used for controlling and protecting the system. The circuit breaker employs the thermal expansion self-blast arc-extinguishing principle and is filled internally with SF6 gas, which offers exceptional arc-extinguishing and electrical insulation properties. All sealing points utilize dual O-ring seals, effectively preventing gas leakage. Additionally, it is equipped with a CT30-type spring-operated mechanism that enables synchronized three-phase mechanical operation.

The switching performance is stable, reliably interrupting faults such as outgoing-line short circuits, loss of synchronism, and near-zone faults.

The arc-extinguishing chamber features a simple, reliable design and is easy to maintain;

It boasts a long electrical lifespan, capable of fully interrupting rated current up to 20 times, and requires no maintenance for 10 years under normal operating conditions.

It requires minimal operating force and features a simple, reliable, and compact spring-operated mechanism.

The gas has a low rated filling pressure, making it suitable for use in low-temperature conditions.

Small footprint;

Low noise levels make it suitable for residential areas;

Long maintenance cycles with minimal upkeep requirements;

On-site installation and commissioning take a short time.

Number of fracture points per pole	Name			Unit	Parameters
1	System Nominal Voltage			kV	110
2	Rated Voltage			kV	126
3	Rated frequency			Hz	50/60
4	Rated current			A	3150
5	Rated Short-Circuit Interrupting Current			kA	31.5	40
6	Rated Short-Circuit Making Current (Peak)			kA	80	100
7	Rated Short-Time Withstand Current (Thermal Stability Current)			kA	31.5	40
8	Rated Peak Withstand Current (Dynamic Stability Current)			kA	80	100
9	Rated Short-Circuit Duration (Thermal Stability Time)			s	4	3
10	First-time homeownership rate				1.5
11	Lightning Impulse Withstand Voltage			kV	650
12	1-minute power frequency withstand voltage			kV	275
13	Creepage Distance			mm/kV	25/31
14	Rated Operating Sequence				O-0.3s-CO-180s-CO
15	Closing time			Ms.	≤110
16	Breaker Operation Time			Ms.	≤65
17	Combine—Split Time			Ms.	≤85
18	Closing time			Ms.	80 ± 5
19	Trip-off time			Ms.	33 ± 7
20	Number of断口 per pole			One	1
21	Main circuit resistance			μΩ	≤45
22	Mechanical Life			Next time	10000
23	SF6 gas pressure (20°C)	Rated value		Mpa	0.55		0.60
		Alarm threshold		Mpa	0.50		0.55
		Lock-in value		Mpa	0.45		0.50
24	SF6 Moisture Content			ppm (V/V)	≤150
25	SF6 Annual Leakage Rate				≤1%
26	Auxiliary circuit voltage			V	AC220
27	Closing coil		Voltage	V	DC220			DC110
			Electric current	A	2			3.3
28	Trip coil		Voltage	V	DC220			DC110
			Electric current	A	2			5.8
29	Energy-storage motor		Voltage	V	AC220/DC220
			Power	W	600
30	Energy storage time			s	≤15

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