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VKM type OLTC

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The VKM type oil-immerses vacuum OLTC is the upgrading design of KM type oil-immersed tap changer, which break current by 12 pieces of vacuum tube during switch, and it has some excellent performance such as reliable switch, no carbonization of insulation oil and high strength of withstanding pressure, it need not oil filter. It is classed as bolted cover type construction and bell type construction, they are suitable for bolted cover type transformer and bell type transformer respectively.
The OLTC drived by KDJ-I type motor can achieve the goal of change transformer taps and voltage regulation. It will achieve the goal of display of operation taps of tap changer and operation control if it is equipped with KYC-3D intelligent tap display; and if it is equipped with KYJK-1/2 intelligent controller, it will achieve the goal of tapping display, remote control and automatic voltage regulation of OLTC and parallel operation control of many transformers. The OLTC is suitable for power transformer or industrial transformer whose voltage range is from 35KV to 220KV, the Max. rated current are 600A for 3-phase and 1500A for single phase, and the frequency is 50Hz, it will change the taps to achieve the purpose of voltage regulation with load. The 3-phase tap changer is used for neutral voltage regulation of Y connection and the single phase is used for any regulating methods.

Technical data

Technical data for VKM series of OLTC

No. description VKM
III500
VKM
III600
VKM
I501
VKM
I601
VKM
I802
VKM
I1203
VKM
I1503
1 Max. rated current/A 500 600 500 600 800 1200 1500
2 Rated frequency/Hz 50-60
3 Phase No. and vector group Y connection for 3-phase and any connections for 1-phase
4 Max. class voltage/V 4000
5 Rated class capacity/kVA 1400 1500 1500 1500 2000 3100 3500
6 Capacity of withstanding short circuit/kA Thermal stability/3sRMS 8 9 8 9 16 24 24
Dynamic stability/peak value 20 20 20 20 40 60 60
7 No. of positions Standard design: The Max. tap positions for liner regulation is 17 and the Max. NO. for forward regulation or coarse-fine regulation is 35
8 Main insulating level/kV Highest voltage of system 72.5 126 170 252
Power frequency voltage(50Hz1min) 140 230 325 460
Impulse withstanding voltage(1.2/50μs) 350 550 750 1050
9 Tapping selector It can be classified B, C, D, DE according insulation level
10 Machine life /10 thousand times 150
11 Electric life/10 thousand times 30
12 Conservator of tap changer Operation pressure 30kPa
Sealing performance 60?kPa?no leakage in vacuum for 60 kPa 24h and 133Pa
Protection for over pressure Blasting cover 300 + 20% kPa super pressure blasting
Gas relay Setting oil speed 1m/s±10%
13 Motor mechanism KDJ-Ⅰ
14 Oil discharge of tap changer/L 200~275
15 Oil filling of tap changer /L 130~190
16 Weight of tap changer/kg 265~295

Note:
1)I506/601 expresses that tap changer is formed with 1 group of contacts; I802 expresses that tap changer is formed with 2 groups of contacts; I1203/1503 expresses that tap changer is formed with 3 groups of contacts.
2)The dimension of DE class selector consists with D class selector, the DE class contacts shielding adopts insulation coating.

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