THV On-load Tap-changer
The THV on-load tap-changer is a composite structure that compounds the functions of a diverter switch and tap selector together to form a selector switch that assumes both tap selection and load current switching into an overall plug-in structure that is compact, easy to maintain, and reliable.
Product Description
THV on-load tap-changers are suitable for power transformers with rated voltages of 35 kV and 63 kV, maximum rated through-currents of 350 A and 500 A for three-phase and 350 A for single-phase, and a rated frequency of 50 Hz, and are used to change the tap position of the regulating coil to achieve the purpose of regulating the voltage in the load state. The THV on-load tap-changer is a composite structure that combines the functions of a diverter switch and a tap selector to form a selector switch that assumes both tap selection and load current switching. It has an integral plug-in structure, is compact, easy to maintain and reliable, and is suitable for use with small and medium-sized transformers.
Technical Parameters
1.Maximum rated passing current /A:350
2.Rated frequency /Hz:50-60
3.Number of phases and connection method:Three-phase Y/D connection; Single-phase arbitrary connection.
4.Maximum stage voltage（V）
4.1 10 Contact terminal:1650
4.2 12 Contact terminal:1400
4.3 14 Contact terminal:1000
5.Rated capacity（kVA）
5.1 10 Contact terminal:525
5.2 12 Contact terminal:420
5.3 14 Contact terminal:350
6.Withstand short circuit ability /kA
6.1Thermostabilization /3s virtual value:5
6.2Dynamic stability / peak value:12.5
7.Number of working positions:Standard design: the maximum linear tone is 13 levels, and the maximum positive and negative tone or coarse and fine tone is 27 levels.
8.1Main insulation level /kV
8.1.1Highest voltage for equipment:40.5
8.1.2Power frequency voltage（50Hz1min）:85
8.1.3Impulse withstand voltage (1.2/50μs):200
8.2Internal insulation level /kV (impulse/power frequency)
8.2.1a：Maximum and minimum tap room:10contact terminal：200/50, 14 contact terminal：170/50
8.2.2b：Any tapped phase
8.2.2.1Y receive:200/70
8.2.2.2D receive:40.5kV： 225/85
8.3c：Coarse-tone alternation:350/140
8.4d ：In-phase coarse tuning at both ends:200/53
9.Mechanical life/ten thousand times:Be more/bigger than 80
10.Electrical life/ten thousand times:Be more/bigger than 20
11.Switch oil chamber
11.1Working pressure:30kPa
11.2Sealability:60 kPa 24h and 133Pa Vacuum leak-free
11.3Overpressure protection:Blasting cover 300±20% kPa Overpressure blasting
11.4Gas relay:Set oil speed 1m/s±10%
12.Equipped with electric mechanism:DJ-II
Submitted successfully
We will contact you as soon as possible