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KMB type on-load tap changer

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KMB type on-load tap changer is on basis of optimization and improvement of KM type tap changer。 For bell type tap changer installation, lifting switching core is not necessary to remove top flange, whose installation is convenient. Selector adopts cylinder type structure, which has strong mechanical strength. It is divided into roof type and bell type, and is separately suitable for roof type transformer and bell type transformer.
Transformer tap position change is performed via KDJ-I type electric motor mechanism. With KYC-3D intelligent position indicator, it can indicate position of tap changer and perform operation control while with KYJK-1/2 intelligent controller, it can display tap position and realize that remote control, automatic voltage regulation and parallel operation control for several transformers.

Technical Data Sheet

Technical Data Sheet for KMB type on-load tap changer

Serial No.
description
KMB
III500
KMB
III600
KMB
I?501
KMB
I?601
KMB
I?802
KMB
I?1203
KMB
I?1503
1
Maximum rated through current/A
500
600
500
600
800
1200
1500
2
Rated frequency/Hz
50-60
3
Phase number and connection method
Three-phase Y connection, single-phase optional connection
4
Maximum step voltage /V
4000
5
Rated step power /kVA
1400
1500
1400
1500
2000
3100
3500
6
Withstand short-circuit ability/kA
Thermal stability/3s
effective value
8
9
8
9
16
24
24
Dynamic stability/
peak value
20
20
20
20
40
60
60
7
Tap position number
Standard design: maximum 17 steps for linear; maximum 35 steps for reverse /coarse/fine
8
Main insulation level /kV
Equipment highest voltage
72.5
126
170
252
Power-frequency voltage(50Hz1min)
140
230
325
460
Impact withstand voltage(1.2/50μs)
350
550
750
1050
9
tap selector
It is divided into B、C、D、DE as per insulation level
10
mechanical life
80
11
Electric life
20
12
Tap changer oil compartment
Operation pressure
30kPa
Sealing performance
60 kPa 24h和133Pa
No leakage for 60 kPa 24h and 133Pa vacuum
Overpressure protection
Blasting cover is burst for overpressure of 300±20% kPa
Gas relay
Setting oil speed 1m/s±10%
13
with electric motor mechanism
KDJ-I
14
tap changer draining oil quantity/L
195-265
15
Tap changer filling oil quantity/L
130~190
16
Tap changer weight/kg
Without tap selector
275
275
250
250
260
280
280
With tap selector
290
290
270
270
280
295
295

Note:
1) I501/601 means that tap changer is consisting of one set of contact; I802 means that tap change is consisting of two sets of contact in parallel; I1203/1503 means that tap changer is consisting of three sets of contacts in parallel.
2) Dimension of selector for class DE and class D is same and the contact shielding case of class DE adopts insulation coating.

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