Product Application
The function of the grounding transformer is to lead out the neutral point for adding arc suppression coils or resistors when the neutral point of the system is △ -type connection or Y-type connection and cannot be led out. This type of transformer adopts Z-type connection (or zigzag connection). The difference from ordinary transformers is that each phase coil is divided into two groups and wound in reverse on the phase magnetic column. The advantage of this connection is that the zero-sequence magnetic flux can flow along the magnetic column, while the zero-sequence magnetic flux of ordinary transformers flows along the leakage magnetic path. Therefore, the zero-sequence impedance of the Z-type grounding transformer is very small (about 10Ω), while that of ordinary transformers is much larger.
Implementation Standards
GB 1094 GB 10229 IEC60076
Technical Parameters
● Primary rated capacity: 200~3150 kVA
● Secondary rated capacity: 100~400 kVA
● Primary rated voltage: 6.3, 10, 20, 35 kV
● Secondary rated voltage: 0.4 kV
● Rated frequency: 50Hz or 60Hz
● Insulation class: F class or H class
● Insulation level: According to the requirements of the corresponding voltage level standard
● Cooling method: AN or AF
● Conditions of use: Indoor
Keywords
Grounding transformer
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Product Application
The function of the grounding transformer is to lead out the neutral point for adding arc suppression coils or resistors when the neutral point of the system is △ -type connection or Y-type connection and cannot be led out. This type of transformer adopts Z-type connection (or zigzag connection). The difference from ordinary transformers is that each phase coil is divided into two groups and wound in reverse on the phase magnetic column. The advantage of this connection is that the zero-sequence magnetic flux can flow along the magnetic column, while the zero-sequence magnetic flux of ordinary transformers flows along the leakage magnetic path. Therefore, the zero-sequence impedance of the Z-type grounding transformer is very small (about 10Ω), while that of ordinary transformers is much larger.
Implementation Standards
GB 1094 GB 10229 IEC60076
Technical Parameters
● Primary rated capacity: 200~3150 kVA
● Secondary rated capacity: 100~400 kVA
● Primary rated voltage: 6.3, 10, 20, 35 kV
● Secondary rated voltage: 0.4 kV
● Rated frequency: 50Hz or 60Hz
● Insulation class: F class or H class
● Insulation level: According to the requirements of the corresponding voltage level standard
● Cooling method: AN or AF
● Conditions of use: Indoor
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