Products Description

Our ngr system combines the grounding transformer, resistor, current transformer, isolating switch, intelligent monitor, and cabinet. The transformer may use dry or oil-immersed insulation according to the selected configuration.

Technical Principle

The transformer creates an artificial neutral point for a system that otherwise has no accessible neutral. During a ground fault, zero-sequence current flows through the grounding path so the connected resistor or arc-suppression coil can limit or compensate fault current.

Product Features

The ngr system places the main grounding and monitoring functions in one coordinated package. Multiple connection groups and insulation forms support different neutral-point designs. The integrated current transformer and monitor provide operating information for protection coordination. A cabinet-based arrangement simplifies site wiring and equipment organization.

Operating Conditions

The product shall be installed and operated within the ratings stated in the technical parameters. Key site requirements include: altitude, and seismic conditions.; frequency. Keep the installation area clean, adequately ventilated, free from corrosive gas and severe vibration, and provide the specified grounding, clearance, and power quality.

Product Parameters

Parameter	Details
Grounding-transformer capacity	≤5000 kVA
Voltage range	66 kV, 35 kV, and below
Tap range	±2×2.5% or ±5%
Phase / frequency	Three phase / 50 Hz or 60 Hz
Connection options	Zn,yn11; Zn,yn1; or Zn
Insulation options	F-class dry type; A- or B-class oil immersed
Long-term temperature rise	100 K
Maximum applied voltage	Generally ≤105% of rated tap voltage
Installation altitude	≤3000 m
Seismic requirement	Seismic intensity ≤8

Product Advantages

The ngr system places the main grounding and monitoring functions in one coordinated package.
Multiple connection groups and insulation forms support different neutral-point designs.
The integrated current transformer and monitor provide operating information for protection coordination.
A cabinet-based arrangement simplifies site wiring and equipment organization.

Main Applications

The ngr system is used for medium- and high-voltage networks that require a grounding transformer with low-resistance fault-current limitation.

It suits substations, industrial distribution systems, power plants, and renewable-energy collection networks.

The package is selected when the system has no accessible neutral point.

Components

Part	Function
Grounding transformer	Creates the neutral point for the grounding branch.
Neutral grounding resistor	Limits the ground-fault current to the design value.
CT and isolating switch	Provide measurement and safe circuit isolation.
Monitor and cabinet	Handle status supervision, protection interfaces, and enclosure.