Product Introduction

Transformer Neutral Grounding Resistor cabinets are key equipment for transformer neutral - point grounding protection in modern 10kV and 35kV medium - voltage power distribution systems. By inserting a precisely designed resistor between the neutral point of the transformer's star winding and the ground, they limit the fault current in the event of a single - phase grounding fault to a preset safe range, effectively suppressing overvoltages and protecting the insulation of equipment such as transformers, cables, and switches. They also provide reliable operating signals for relay protection devices, serving as a core component in improving the reliability, safety, and stability of distribution network power supply.

Product Picture

Core Functions and Value

Limiting Fault Current and Protecting Main Equipment:

When a single - phase ground fault occurs in the system, the resistor cabinet quickly limits the fault current to a controllable level of 100A to 1000A (common range), preventing the huge fault current surge from causing thermal and mechanical damage to transformer windings, cable connectors, circuit breakers, and other components, thereby extending equipment service life.

Suppressing Arc Overvoltage and Ensuring Insulation Safety:

Effectively eliminates or suppresses dangerous overvoltages (up to 3 - 5 times the normal phase voltage) caused by arc grounding or intermittent grounding, preventing insulation breakdown in the system and protecting the insulation system of transformers and other electrical equipment.

Providing Clear Fault Signals for Rapid Clearance:

Working in conjunction with zero - sequence current transformers (CTs), the resistor cabinet provides the relay protection system with a stable, clear zero - sequence current signal, enabling the protection device to sensitively and accurately identify the fault line, quickly issue a trip command, and quickly isolate the fault point, minimizing the scope of the power outage and maximizing power supply continuity.

production equipment

Application Areas

Power plants and substations:

In 6kV - 35kV medium - voltage power grids, particularly those primarily powered by cables, Transformer Neutral Grounding Resistors can effectively reduce the risk of fires caused by ground faults, ensuring safe and stable power generation and transmission.

Industrial and mining enterprises:

In industries such as metallurgy, petrochemicals, and steel, which require extremely high power supply reliability, this device can reduce equipment damage and production interruptions caused by ground faults, ensuring continuous and efficient production.

Urban distribution networks:

With the widespread integration of distributed power sources, Transformer Neutral Grounding Resistors can be used in conjunction with devices such as arc suppression coils to enhance the flexibility and adaptability of distribution networks, ensuring safe and reliable urban power supply.