Oil-immersed Earthing Transformers-35kV 66kV
| Brand | Vziman |
| Model NO. | Oil-immersed Earthing Transformers-35kV 66kV |
| Rated voltage | 35kV |
| Rated frequency | 50/60Hz |
| Series | JDS |
66kV Oil-immersed Earthing Transformers Description
The 66kV oil-immersed earthing transformers are usually used in a power system without neutral point, to provide an artificial neutral connection for earthing directly or via an impedance such as an arc suppression reactor, a resistor, a current-limiting reactor and so on.The earthing transformers may adopt a secondary (low-voltage winding) for continuous use as a power supply for the substation station.
66kV Oil-immersed Earthing Transformers Features
- Low zero-sequence impedance
- High magnetizing impedance
- Low loss level, low noise
- Long service life
66kV Oil-immersed Earthing Transformers Technical Specifications
- Insulation Type：Dry-type/Oil-immersed
- Type ：6kV~35kV/6kV~66kV
- Voltage Scope：100kVA~3800kVA/100kVA~5700kVA
- Capacity Range：-25°C ~ +45°C/-45°C ~ +45°C
- Environmental Temperature：-45°C ~ +45°C/-45°C ~ +45°C
Yes, they are often used in tandem with arc suppression coils. The earthing transformer provides a stable neutral point, while the arc suppression coil compensates for the capacitive current of the system, effectively extinguishing arc grounding faults and reducing fault damage.
Q:What is the altitude limit for 66kV oil-immersed earthing transformers during operation?
A:The standard altitude adaptability is generally within 1000m. For applications above 1000m, the insulation performance and heat dissipation structure need to be specially designed to ensure stable operation under low air pressure conditions.
Q:Why choose an oil-immersed structure for 66kV earthing transformers instead of a dry-type one?
A:The oil-immersed structure offers excellent insulation performance and heat dissipation capacity, which is more suitable for the high-voltage 66kV grade. It has strong overload resistance, good sealing performance, and can adapt to harsh operating environments, making it ideal for long-term outdoor operation.
Q: What safety protection devices are equipped with 66kV oil-immersed earthing transformers?
A:Typical safety devices include pressure relief valves, gas relays, temperature controllers, and oil level gauges. These devices monitor parameters such as internal pressure, gas accumulation, temperature, and oil level in real time, and trigger alarms or tripping actions to prevent catastrophic failures.
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