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KMD On-load tap changer

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KMD type on-load tap changer is on basis of optimization design of KM type, which adopts outside cylinder shaft and transmission in middle position, and is consisting of selector switch and tap selector. Tap changer, whose structure is bell type, and is used for bell type transformer.
The tap changer that is driven by KDJ-I electrical motor mechanism can realize the conversion of transformer tap position to achieve the purpose of voltage regulation. With KYC-3D intelligent position displayer, it can indicate tap position while with KYJK-1/2 intelligent controller, it can display tap position, and realize remote control, automatic voltage regulation and parallel control of several transformer.
The max. tap position number for KMD tap changer without change-over selector (liner regulation) is 18. And with change-over selector (forward/reverse or coarse-fine regulation), the tap position number can reach 35, special design can reach 107.

Technical data of KMD on load tap changer

Item Specification KMD
III500
KMD
III600
KMD
III800
KMD
III1000
KMD
I501
KMD
I601
KMD
I802
KMD
I1203
KMD
I1503
1 Max. rated through current/A 500 600 800 1000 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 1800 3000 1400 1500 2000 3100 3500
6 Bearable short-circuit capacity /kA thermal stability / virtual value, 3s 8 9 10 15 8 9 16 24 24
dynamic stability / peak value 20 20 24 35 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 regulatio
8 Main insulation level /kV Main insulation level 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 24h 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 200~275
15 filling oil quantity for tap changer /L 130~190
16 mass of tap changer /kg 265~295

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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