Shenyang Xinxin Alliance Electric Co.,Ltd
GIS、Circuit & Parts
GIS, circuit breaker, disconnector & its parts
GIS, circuit breaker, disconnector & its parts
LW10B-550 SF6
1.General Description
LW10B-550 SF6 circuit breaker consists one post, two interrupters and one mechanism each pole. It could operate in single-pole mode and in three-pole mode as well.
Tested in CESI, Italy, the equipment was put into service in the year of 1998. Since then, there have been more than 1 000 sets servicing in the power system. Furthermore the equipment has been sold to Iran, Iraq and India.
2.Main technical Data
Technical parameters 1： CB
Item
Unit
Value
CY
YT ， CYT
Rated voltage
kV
550
Rated frequency
Hz
50
Rated current
A
3150
4000
Rated short-circuit breaking current
kA
50
63
Short-line fault breaking current
kA
45
56.7
Rated out-of-phase breaking current
kA
12.5
15.75
Rated peak withstand current
kA
125
160
Rated short-circuit making current (peak)
kA
125
160
Rated short-time withstand current
kA
50
63
Rated short-circuit duration
s
3
Rated line charging breaking current (rms)
A
500
5 min power-frequency withstand voltage at zero gauge pressure of SF6 gas (rms)
Incoming and outgoing line of one pole
kV
476
Pole to earth
kV
476
1min power-frequency withstand voltage (rms)
Incoming and outgoing line of one pole
kV
740 (+315)
Pole to earth
kV
740
Lightning impulse withstand voltage, full wave 1.2/50μs (peak)
Incoming and outgoing line of one pole
kV
1675+ (450)
Pole to earth
kV
1675
Operating wave impulse 1.2/2500μs (peak)
Incoming and outgoing line of one pole
kV
1175+ (450)
Across the breaker
kV
1800
Pole to earth
kV
1300
Shunt capacitance
pF
2500
Shunt closing resistance
Ω
400±5%
Rated SF6 gas pressure (at 20℃)
MPa
0.6
Moisture content of SF6 gas in circuit breaker itself (when leaving the factory)
ppm
≤150
Annual leakage rate of SF6 gas
%
≤1
Weight of SF6 gas in single pole
kg
20 (without resistor)/25 (with resistor)
Weight of single-pole circuit breaker
kg
2840 (without resistor)/3800 (with resistor)
Closing/opening operating force
kN
60/130
Allowable tensile force of terminal
Horizontal longitudinal
N
2800
Horizontal transverse
N
2400
Vertical
N
1000
Technical parameters 2： CB
Item
Unit
Value
CY
CYT
YT
Opening time
ms
≤32
20
20±2
Closing time
ms
≤100
65±15
62±4
Full breaking time
ms
≤50
≤40
≤40
Close-open time
ms
35~60
55±5
60
Dead time
s
When leaving the factory ≤0.3,  in service ＞0.3
Opening simultaneity between poles
ms
3
Closing simultaneity between poles
ms
5
Opening simultaneity across breaker of the same pole (double breakers)
ms
2
Closing simultaneity across breaker of the same pole (double breakers)
ms
3
Closing time of the resistor prior to main breaker
ms
7~11
Close-open time of the breaker with resistor
ms
25~50
TECHNICAL PARAMETERS