Huaming has launched several types of reactive LTC to amplify its products. Today we’re going to introduce some of them.
First, the HMDK series, which is externally mounted, which is installed in the transformer external oil tank by means of aluminum brackets at the tail of the tap-changer. It is suitable for 60Hz single-phase oil-immersed voltage regulating transformer: linear regulation 17 positions as well as reversing & coarse and fine regulation 33 positions. The working temperature in oil is between -25℃ and 80℃.
Model | HMDK 300A | HMDK 640A low voltage | HMDK 640A high voltage |
Rated current（A） | 300 | 640 | 640 |
Max. rated current（A） | 480 | 668 | 668 |
Short circuit（kA） | 2Srsm | 7.5 | 16 | 16 |
0.8Srsm | 12 | 20 | 20 |
Peak | 27.12 | 45.2 | 45.2 |
Rated voltage（kV） | 27.6 | 27.6 | 35 |
Step voltage (V) | 172.5 | 172.5 | 219 |
Insulation | BIL 1.2/50μs | 150KV | 150KV | 200KV |
Power frequency 50Hz，1min | 50KV | 50KV | 85KV |
Phase | Single |
Frequency | 60Hz |
Max. positions | 33 |
Mechanical life | No less than 2,000,000 operations |
Electrical life | No less than 180,000 operations |
Working temperature | -30℃～90℃ |
Drying temperature | 120℃~125℃ |
Time interval between 2 switchings | ≥1s |
Weight（kg） | 22.5 | 33 | 36 |
Motor parameters | Rated voltage（V） | 115 | 20 | 115 |
Nominal output power (W) | 20 | 20 | 20 |
Frequency（Hz） | 60/50 | 60/50 | 60/50 |
Current（A） | 0.58 | 0.58 | 0.58 |
Second, the newly designed HFDK. Different from current similar products on the market, which use chain to drive, lacking stability. HFDK innovatively adopts gears as tap-changer drive and double-spring & double-locking mechanism as the switching drive, making it compact, reliable and longer life.
Rated current（A） | 300 |
Max. rated current（A） | 480 |
Short circuit（kA） | 2Srsm | 7.5 |
0.8Srsm | 12 |
Peak | 27.12 |
Rated voltage（kV） | Highest | 27.6 |
Lowest | 2.5 |
Step voltage（V） | Rated voltage’s 0.625% |
Insulation | BIL 1.2/50μs | ＜13.8kV | 80kV |
＞13.8kV | 150kV |
Power frequency 1min | 50kV |
Phase | Single |
Frequency | 60Hz |
Max. positions | 33 |
Mechanical life | 不低于200万次 |
Electrical life | 不低于18万次 |
Working temperature | -30℃～90℃ |
Drying temperature | 125℃/16h |
Time interval between 2 switchings | ≥1s |
Weight（kg） | 32 |
Motor parameters | Nominal output power (W) | 58.7 |
Frequency（Hz） | 60 |
Current（A） | 0.46 |