6kV three-phase dry-type voltage transformer
06-21 2025 | By:
6kV three-phase dry-type voltage transformer
This voltage transformer is a 6kV voltage transformer, which belongs to three-phase voltage transformer, cast voltage transformer, and dry voltage transformer. It is suitable for outdoor installation and can be used as a voltage transformer for metering and measurement; voltage ratio (transformation ratio) (V): 6000/√3/100/√3/100/3, 6000/√3/100/√3/100/√3/100/3; accuracy level: 0.2, 0.5, level 1, level 3, 6P; working voltage is 6kV
6kV three-phase dry-type voltage transformer
Overview
This 6kV three-phase dry-type voltage transformer is a three-phase, indoor, dry-type product, suitable for power metering, voltage monitoring and relay protection in power systems with rated frequency of 50H or 60Hz and rated voltage of 10kV.
Structural features
This series of products is an indoor epoxy resin full vacuum casting structure. Its surface creepage distance is greater than 25mm/kV, and the magnetic material is made of high-permeability silicon steel sheet after annealing. When this voltage transformer is used in the system, each group requires three cast bodies, which are mounted on a three-phase five-column iron core. The metering winding and the protection winding are separated. The accuracy of the metering and the reliable function of the protection are effectively guaranteed. When this voltage transformer is used in the system, each group requires three cast bodies, which are mounted on a three-phase five-column iron core. The metering winding, the monitoring winding, and the protection winding are separated. The accuracy of the star counting and the reliable function of the protection are effectively guaranteed.
Function
1. For the ferromagnetic resonance circuit, the circuit may have more than one stable working state under the same power supply potential. The working state in which the circuit is stable depends on the transition process caused by the external impact. 2. The nonlinear ferromagnetic characteristics of the voltage transformer are the root cause of the ferromagnetic resonance, but the saturation effect of the ferromagnetic element itself also limits the amplitude of the overvoltage. In addition, the circuit loss also damps and limits the resonant overvoltage. When the loop resistance is greater than a certain value, there will be no strong ferromagnetic resonance overvoltage. 3. For the series resonant circuit, the necessary condition for the generation of ferromagnetic resonance overvoltage is ω0=1/L0C<ω. Therefore, ferromagnetic resonance can occur in a wide range.
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