LW36-72.5 126 Outdoor High Voltage Vacuum Circuit Breaker

72.5kV outdoor high voltage vacuum circuit breaker is designed for harsh environment, using fully sealed stainless steel housing and vacuum arc extinguishing technology, with explosion-proof, anti-corrosion, anti-ultraviolet performance, adapt to -40℃ to +40℃ extreme temperature. Rated short circuit breaking current 31.5kA, mechanical life 10,000 times, maintenance-free structure significantly reduces operation and maintenance costs, suitable for substations, industrial and mining distribution and wind power/photovoltaic high voltage grid-connected systems, in line with IEC 62271 and GB standards

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Outdoor High Voltage Vacuum Circuit Breaker
Browse number：

46
Release time：

2024-10-22 05:11:16
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Detailed Description

Overview

LW36-126 outdoor high-voltage sulfur hexafluoride circuit breaker is a three-phase AC 50HZ outdoor High-voltage Switchgear, suitable for control and protection of 126KV power transmission and transformation system; it can also be used in the occasions of contact breaking and groups of opening and closing.

LW36-126 type circuit breaker adopts the principle of "thermal expansion + blowing aid" which can only extinguish the arc, and it is equipped with a CTB-1 spring-operated mechanism.

The circuit breaker conforms to GB1984-2003 "AC High Voltage Circuit breakers" and meets the requirements of IEC62271-100:2001 "High voltage switchgear and controlgear - Part 100: High voltage AC Circuit Breakers" of the International Electrotechnical Commission.

Main features of circuit breakers:

The circuit breaker adopts the principle of self-energy arc extinguishing, with excellent breaking performance, short arc-burning time, long electrical life and low operating noise. SF6 gas with excellent insulation and arc extinguishing performance is used as the insulation and arc extinguishing medium, with no danger of combustion and explosion, and can be used in densely populated areas. The circuit breaker is equipped with spring actuating mechanism, simple and compact structure, safe and reliable.

Environmental conditions of use

1.3.1 Ambient temperature -30 ℃ ~ +40 ℃ (special requirements of -40 ℃ ~ +40 ℃)

1.3.2 Altitude ≤4000m

1.3.3 Air temperature

Relative temperature: daily average not more than 95%

Monthly average not more than 90% (25°C)

Saturation vapor pressure:daily average not more than 2.2×10-3 MPa

1.3.4 Wind pressure not greater than 700 Pa

1.3.5 Ice cover thickness 10 mm

1.3.6 Seismic intensity: Horizontal acceleration: ≤0.3g

Vertical acceleration: ≤0.15g

1.3.7 Intensity of sunlight: 0.1 W/cm2 (at 0.5 m/s wind speed)

1.3.8 Maximum daily temperature difference of 25°C

1.3.9 Nominal creepage ratio distance: 31mm/kV

1.3.10 No flammable and explosive hazards and

chemical corrosion, violent vibration occasions

Main technical parameters

serial numbe	Item		unit (of measure)	Technical Parameters
1	rated voltage		KV	126
2	Rated frequency		Hz	50
3	rated current		A	3150
4	Rated short-circuit breaking current	short-circuit current	kA	31.5
		DC component	-	40%
5	Rated short circuit duration		s	4
6	Rated short-time withstand current		kA	40
7	Rated short-circuit closing current (peak)		kA	100
8	Rated peak withstand current			100
9	Rated 1min frequency withstand voltage (RMS))	with respect to ground, between phases	kV	230
		between contacts		265
10	Rated lightning impulse withstand voltage (peak)	with respect to ground, between phases		550
				650
11	5min zero gauge pressure withstand (RMS)	between contacts,with respect to ground		95
12	Rated out-of-step breaking current		kA	IeX25%
13	Near-area fault opening current			IeX90%，IeX75%
14	Rated line charging breaking current		A	50
15	Rated sequence of operation		-	O-0.3s-CO-180s-CO
16	First open pole factor		-	1.5
17	Closing time		ms	≤100
18	Split time			30≤t≤45
19	breaking time			≤60
20	Opening and closing time			60
21	Opening synchronization			4
22	Closing synchronization			5
23	Rated SF6 gas pressure (20°C)		Mpa	0.60
24	Annual SF6 gas leakage rate		-	≤0.5%
25	Gas Moisture Content		ppm (v/v)	≤150
26	radio interference level		μV	≤2500
27	mechanical life span		times	6000
28	Quality per breaker		kg	1400
29	Mass of SF6 gas per unit			6
30	Main circuit resistance per pole		μΩ	70

1.4.2 Mechanical parameters of circuit breakers and actuators are shown in Table 2.

1.4.1 The main technical parameters of the circuit breaker are shown in Table 1.

serial number	Item	unit (of measure)	digital	Remarks
1	Dynamic contact travel	mm	130⁺²_-3
2	Angle Stroke		27±2
3	Spring Mechanism Stroke		100⁰_-3
4	Clearance between arm rollers and mechanical cams		1.4±0.3	Breaker in open state, closing spring energized.
5	Distance between closing spring locating nut and locating rod B		12~47	Breaker in open state, closing spring energized.
6	Closing solenoid travel C		5.0~5.5	Circuit breaker in open state
	Trigger and release gap D		2.0~2.5
	C-D		3.0~3.5

7	Split solenoid travel F		2.8~3.2	Circuit breaker in closed state
7	Trigger and release gap G		0.8~1.2
	F-G		1.6~2.4

1.4.3 Control loop and auxiliary loop parameters in Table 3

serial number	Item		unit (of measure)	Remarks
1	Switching and closing circuit control voltage		v	DC220	DC110
2	Switching coil current		A	小于2.3	5.5
3	Closing coil current		A	2	3.5
4	Energy Storage Motors	Supply Voltage	V	DC220(110)/AC220
		Normal operating voltage range	-	65%~110%
		power (output)	W	450
		Energy storage time	s	≤15
		number of revolutions per minute	r.p.m	750
		amps	A	3.6	5.5
5	Heater has lighting circuit voltage		V	AC220
6	Heater power		W	100

1.4.4 SF6 gas pressure parameters are given in Table 4 (20°C).

serial number	Item	unit (of measure)	Remarks
1	Rated inflation pressure	Mpa	0.6
2	Charge Air Alarm Pressure		0.55±0.03
3	lockout pressure		0.50±0.03

Product structure and principle

2.1 General structure and principle

The overall structure of this product adopts self-energizing arc extinguishing chamber, each pole is a single column with a single interrupter, referred to as pole. Each circuit breaker consists of three poles, and three poles are installed on the same frame, operated by a spring mechanism, mechanical linkage between the three poles. The upper part of the product is the arc extinguishing chamber ceramic sleeve, the middle part is the pillar ceramic sleeve and frame, the mechanism box is centered and suspended in the lower part of the frame, the mechanism box is equipped with a spring-operated mechanism, the electrical control part, the mechanism's output tie rod is connected with the actuating arm of B. The SF6 gas density controller is installed in the front side of the frame, and both ends of the frame are supported by the pillars.

The control principle is categorized into two schemes: single-split circuit and double-split circuit. Annex III: Electrical Control Schematic and Annex IV: Secondary Wiring Diagrams are for reference and are based on the double-split circuit. The engineering agreement shall prevail, and the corresponding electrical control schematic and secondary wiring diagrams will be supplied randomly.

1.Single-pole circuit breakers (poles) 2.frames 3. nameplates 4. density controllers

5.gas fills and inspection ports 6. mechanism boxes 7. poles Figure 1 Overall structure of circuit breaker

Figure 1 Overall structure of circuit breaker

2.1.1 Single-pole circuit breakers

2.1.1.1 The structure of the single-pole circuit breaker is shown in Figure 2

Packing list - One copy
Electrical control principle diagram, secondary wiring diagram - One copy
Product qualification certificate - One copy
Factory inspection report of the product - One copy
On-site installation inspection test report (see Appendix I, to be filled) - Two copies