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JKM Thyristor Type On-load Tap Changer

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JKM thyristor type tap changer is a kind of new combination on-load tap changer, which is revolutionary progress for arc blowout compared with previous on-load tap changer. The product has advantages of oil tap changer and vacuum tap changer, one is that high reliability and safety, and the other is that maintenance-free and no pollution. The product also has following advantages: long life, low energy consumption, small impacting voltage, etc. and is ideal updated product of existing conventional mechanical tap changer(including arc blowout in oil and vacuum arc blowout)

JKM oil-immersed thyristor type on-load tap changer(hereafter called tap changer) is used for power transformer and industrial transformer, whose rated voltage is 35Kv,63kV,110kV,150kV and 220kV and rated through current is 600A for three-phase, 1500A for single-phase and frequency is 50Hz, which can change tap position under on-load condition to perform voltage regulation. Three-phase tap changer is used for Y connection neutral point voltage regulation and single-phase is used for any voltage regulation method. The tap changer is driven by KDJ-Ⅰ type electric motor mechanism to realize the taps switching, in order to regulate voltage. For maximum tap position of JKM type tap changer without switching over selector(linear) or with switching over selector(reverse/coarse/fine), the former is 17, the latter is 35(excluding special design).

Technical Data

Table l: technical data sheet for JKM type on-load tap changer

Serial
No.
Description JKM
III500
JKM
III600
JKM
I 501
JKM
I 802
JKM
I 1203
JKM
I 1503
1 Maximum rated through current/A 500 600 500 800 1200 1500
2 Rated frequency/Hz 50-60
3 Rated frequency/Hz Three-phase Y connection, sing-phase optional connection
4 maximum step voltage/V 3300
5 Rated step power /kVA 1400 1500 1500 2000 3100 3500
6 Withstand short-circuit ability/kA Thermal stability/3s effective value 8 9 8 16 24 24
Dynamic?stability/ Peak?value 20 20 20 40 60 60
7 Tap position number Standard design: max 17 for linear; max 35 for reverse or 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 1,000,000.?times
11 Electric life 1,000,000. times
12 oil compartment operation pressure 30kPa
Sealing performance No leakage for 60 kPa 24h and 133Pa
Over pressure protection 300±20% kPa overpressure blasting for blasting cover
Gas relay Setting oil speed 1m/s±10%
13 with electric motor mechanism KDJ-Ⅰ
14 drain oil quantity /L 200~275
15 Filling oil quantity/L 130~190
16 weight/kg 265~295

JKMI501 in table shows that tap changer is consisting of a set of switching contact
JKMI802 and JKMI1503 show that tap changer is separately consisting of 2 sets of and 3 sets of switching contacts.

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