Embedded pole for vacuum circuit breaker 12kV EEP-12/1600-31.5 EEP-12/1250-31.5
Model No: EEP-12/1600-31.5 EEP-12/1250-31.5
Embedded pole,or called vacuum interrupters with epoxy resin,is made by casting vacuum interrupters,main circuit conduct and mounting parts with epoxy into an integral part. The vacuum interrupters, however,should be enveloped well with a slight fold of silicon rubber jacket before that process.
Parameters of embedded pole
MAIN TECHNICAL SPECIFICATION
UNIT
SPECIFICATION
1600
1250
Rated voltage
kV
12
Rated current
A
1600
1250
Rated frequency
Hz
50/60
Short-duration(1min) power frequency withstand voltage
kV
48
Lightning impulse withstand voltage
kV
95
Rated short-circuit breaking current
kA
31.5
Rated peak withstand current
kA
80
Rated short-circuit making current
kA
80
Rated short-time withstand current
kA
31.5
Rated duration of short-circuit
S
4
Rated breaking current of single capacitor bank
A
400
Rated breaking current of back to back capacitor bank
A
400
Rated operating sequence
o-0.3S-co180S-co
Breaking operations of rated short circuit breaking current
Time
30
Mechanical endurance
Time
20000
Contact self-close force
N
140±50
Force required to hold contacts open at full stroke
N
220±50
Circuit resistance at lower limit of rated contact force
mΩ
≤ 25
Contact limit erosion
mm
3
Gas pressure inside vacuum interrupter
Pa
≤ 1X10-3
Partial discharge
Pc
≤ 5
Weight of moving parts
Kg
Weight of vacuum interrupter embedded poles
Kg
Mechanical data required for the matched vacuum switchgear
MAIN TECHNICAL SPECIFICATION
UNIT
SPECIFICATION
1600
1250
Clearance between open contacts
mm
11±1
Average opening speed
m/s
1.2±0.2
Average closing speed
m/s
0.6±0.2
Rated contact pressure
N
3100±200
Contact bouncing duration at closing operation
ms
≤ 2
Out of simultaneity of contact closing and opening
ms
≤ 2
Bouncing back amplitude of opening contact
mm
≤ 2
Information for Embedded Pole
From the development of insulations on breakers,it can be divided into three generations:air, composite and solid insulation and so-called solid insulation means epoxy embedded pole,which might represent the great advancement of insulation on vacuum breakers.Since the epoxy can be used to replace the insulating and mechanical supports,the breakers therefore become compact and simple and are able to service under humid and dusty conditions.When the external insulations of miniature chambers in air condition fail to fulfill the requests of specifications,embedded poles are therefore introduced and now become one of the most applicable ways in the field of medium voltage breakers either at homeor abroad.
Embedded pole for vacuum circuit breaker 12kV EEP 12/1600 31.5 EEP 12/1250 31.5
