LW10B-252/550 SF6 Circuit Breaker
1.General Description
Series LW10B column type SF6 circuit breakers include 252KV and 550KV products, which are used for making and breaking normal current, fault current and changing over of circuit, so as to realize the control and protection of power system.

Each pole of Type LW10B-252 circuit breaker has one break; Type LW10B-550 consists of two breaks, whether including closing resistor or not is up to requirement. For both of these two kinds of products, each pole is equipped with a hydraulic operating mechanism, which can make single pole operation and/or three pole electrically gang operation.

Complete and strict type tests have been done on the said series products, type tests have been done on the said series products, type test certificates were issued by CESI test laboratory Italy.

2.Main Technical Parameters

Item
Unit
Technical parameters
LW10B-252 LW10B-550
Rated voltage
kV
252
550
Rated frequency
Hz
50
Rated current
A
3150,4000
Rated short circuit breaking current
kA
50
Rated short line fault breaking current
kA
45
Rated out of phase breaking current
kA
12.5
Rated peak withstand current
kA
125
Rated short circuit making current(peak)
kA
125
Rated short time withstand current
kA
50
Rated duration of short circuit
S
3
Rated line charging breaking current(rms)
A
160
500
Breaking time of rated short circuit current
Times
26
Parallel resistance per pole
Ohm
 
400¡À5%(if have)
Mechanical endurance
Times
3000
Auxiliary and control circuit voltage
V
DC220/DC110
Motor voltage
V
AC380/DC220
Weight per pole
Kg
1800
2810
Operating force of opening
Kg
7700
13000
Operating force of closing
Kg
3800
6000

3.Insulation Level

Item
Unit
Technical parameters
LW10B-252 LW10B-550
5 min power frequency withstand
voltage at 0 bar SF6 pressure
Across the open contacts
kV
220
476
Phase to earth
220
476
1 min power frequency withstand
voltage(rms)
Across the open contacts
kV
530
800
Phase to earth
460
740
Lighting impulse voltage full
wave(1.2/50¦Ìs)(Peak)
Across the open contacts
kV
1200
1675+(315)
Phase to earth
1050
1675
Switching impulse voltage(250/
2500¦Ìs)(Peak)
Across the open contacts
kV
 
1050+(450)
Between phases
 
1800
Phase to earth
 
1175

4.Insulator Creepage Distance And Ratio

Type
Level
Across the open contacts
TO earth
Creepage distance(mm)
Ratio(cm/kV)
Creepage distance(mm)
Ratio(cm/kV)
LW10B-252
Normal
¡Ý6050
2.4
¡Ý5180
2.1
Heavy
¡Ý7300
2.9
¡Ý7320
2.9
LW10B-550
Normal
¡Ý12100
2.4
¡Ý9130
1.7
Heavy
¡Ý14600
2.7
¡Ý13750
2.5

5. Mechanical Parameters

Item
Unit
Technical parameters
LW10B-252 LW10B-550
Opening time
ms
¡Ü32
Breaking time
ms
¡Ü60
Closing time
ms
¡Ü100
Close-open time for reclosing
ms
¡Ü60¡À5
Dead time for reclosing
s
¡Ü0.3(Ex-works), >0.3(In Service)
Rated operating sequence
 
O-0.3S-CO-180s-CO
Time interval between opening of 1st and last phase
ms
¡Ü3
Time interval between closing of 1st and last phase
ms
¡Ü5
Time interval between opening of breaks
ms
 
¡Ü2
Time interval between closing of breaks
ms
 
¡Ü3
Closing time interval between resistor and main breaks
ms
 
7--11*
Resistor break close-open time
ms
 
25--50*
Parallel capacitance per break
PF
 
2500¡À5%
Rated SF6 pressure at 20¡æ
MPa
0.6
SF6 gas leakage per year
%
¡Ü1
SF6 gax vapor content(Ex-works)
PPm(V/V)
¡Ü150
Opening coil voltage/resistance/current
V/¦¸/A
DC220/75/3DC110/28.4/4
Closing coil voltage/resistance/current
V/¦¸/A
DC220/109/2DC110/28.4/4
SF6 gas weight per pole(0.6MPa at 20¡æ)
kg
10
20
Terminal load
Longitudinal
 
2500
2500
Horizontal
N
1768
2800
Vertical
 
1500
1500
   
 
 
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