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KM Type On-load Tap Changer

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KM on load tap changer is a combined type OLTC, which is based on the classical M type OLTC to optimize design. It is composed with selector switch and tap selector. It fall into roof type and bell type and respectively be suitable for roof type transformer installation and bell transformer installation.
The tap changer that is driven by KDJ-I electrical—mechanism will realize the conversion of transformer taps to achieve the purpose of voltage regulation. It equipped with KYC-3D intelligent gears displayer to achieve display the gears of changer, and equipped with KYJK-1/2 intelligent controller to achieve display gears of changer, remote control, automatically voltage regulation and achieve multiple operation control several sets transformer.
KM on load tap changer (OLTC) applies to rated voltage 35kV, 63kVto 220kV, maximum rated through current 600A for three poles and 1500A for single pole, frequency is 50Hz,maximum class 4000V power transformer or industry transformer with load regulation output voltage. Three phase OLTCs are used at the neutral point of the Y connection, the single phase OLTC may be used for any connections. It applies to linear regulation, positive and negative regulation, coarse and fine regulation, multi-level positive and negative regulation, multi-level coarse and fine regulation and various voltage regulating modes.

Technical?data

Technical data of KM on load tap changer

item specification KM
III500
KM
III600
KM
I501
KM
I601
KM
I802
KM
I1203
KM
I1503
1 Max. rated through-current /A 500 600 500 600 800 1200 1500
2 Rated frequency /Hz 50-60
3 Phase number and connection type Y connection for 3 phase, any connection for single phase
4 Max. step voltage /V 4000
5 rated step power /kVA 1400 1500 1400 1500 2000 3100 3500
6 Bearable short-circuit capacity /kA thermal stability / virtual value, 3s 8 9 8 9 16 24 24
dynamic stability / peak value 20 20 20 20 40 60 60
7 number of working position standard design: the Max. step is 17 for linear regulation, and the Max. step is 35 for forward/reverse regulation or coarse-fine regulation.
8 Main insulation leval highest voltage of equipment 72.5 126 170 252
highest voltage of equipment(50Hz1min) 140 230 325 460
impulse withstand voltage (1.2/50μs) 350 550 750 1050
9 tap selector it can be divided into four classes with B, C, D, DE according to insulation level
10 mechanical life/ 10 thousand times 80
11 electrical life/ 10 thousand times 20
12 oil cavity of diverter switch working pressure 30kPa
sealing performance 60 kPa 24 and 133Pa vacuum and no leakage
overpressure protection blasting cover300±20% kPa overpressure blasting
gas relay setting oil speed 1m/s±10%
13 Equipped power-driven mechanism KDJ-I
14 draining oil quantity for tap changer /L 195-265
15 filling oil quantity for tap changer /L 130~190
16 mass of tap changer /kg Without change-over selector 275 275 250 250 260 280 280
With change-over selector 290 290 270 270 280 295 295

Note:
1) The “I501/601” expresses that diverter switch is formed with 1 group of diverter contacts;
The“I802” expresses that diverter switch is formed with 2 groups by parallel connection.
The I1203/1503 express that diverter switch is formed with 3 groups of diverter contacts by parallel connection.
2)The size of DE class in accordance with the size of D class, shielding case of DE class contact use insulation
Coating.

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