What is the price of a 13.8kV Neutral Grounding Resistor (NGR) ？

Writer： admin Time：2026-03-02 17:34:29 Browse：6℃

The Neutral Grounding Resistor (NGR) Cabinet is an essential protection component in medium-voltage (MV) power systems. It is widely used to ground the neutral points of transformers and generators. Its core function is to limit single-phase-to-ground fault current, suppress arcing ground overvoltages and resonant overvoltages, and prevent fault escalation, thereby protecting critical equipment while providing sufficient time for protective relaying systems to detect faults and initiate tripping or load transfer.

The pricing of a 13.8kV NGR cabinet is not fixed; it is influenced by specific configuration parameters, enclosure materials, auxiliary features, and logistics. Below is the detailed breakdown of the pricing structure and influencing factors based on two standard specifications.

Specification 1: 13.8kV 800A 10Ω NGR Cabinet

This specification is designed for medium-to-high voltage power distribution systems.

Core Components: Resistor bank rated at 13.8kV, 800A, 10Ω. It utilizes a LZZBJ9-10 Current Transformer (CT) and is equipped with an NS-DZK intelligent monitoring unit for real-time diagnostics. Note: Intelligent monitoring is standard for transformer-connected NGRs, whereas generator-connected units often replace this with a single-phase vacuum contactor.

Enclosure & Material Costs: The base design features a 201 stainless steel, outdoor-rated enclosure. For environments requiring higher corrosion resistance (e.g., high salt mist or humid conditions), upgrading to 304 stainless steel incurs an additional cost of approximately $1,058.00.

Logistics: Base quotes include export packaging and domestic port freight charges.

Base Pricing:

1. 201 Stainless Steel (Outdoor, with Monitoring): Approximately $9,264.00.

2. Cold-rolled Steel (Indoor, with Monitoring): Approximately $8,338.00  (Note: Cold-rolled steel is more cost-effective but offers lower corrosion resistance).

3. Discount Option: If the intelligent monitoring unit is omitted, the price is reduced by approximately $529.00.

4. Dimensions & Weight: Standard dimensions are 1200 x1200 x2200mm with a weight of approximately 300kg. Custom dimensions are available upon request (subject to additional fees).

Specification 2: 4.16kV 300A 8Ω 10S NGR Cabinet

This specification is optimized for medium-to-low voltage industrial power systems.

Core Components: Resistor bank rated at 4.16kV, 300A, 8Ω, with a 10-second thermal withstand rating. Includes standard CT and NS-DZK monitoring unit.

Enclosure: Features a 2.0mm thick 304 stainless steel enclosure, providing superior oxidation and corrosion resistance, suitable for diverse installation environments without additional upgrade costs.

Logistics: Includes accessory packaging; no additional logistics fees apply.

Base Pricing: The standard price for this configuration is approximately $7,058.00.

Dimensions & Weight: Consistent with the previous model at 1200 x 1200 x 2200mm and approximately 300kg.

Summary of Price Influencing Factors

Understanding the price variance requires looking at three primary drivers:

1. System Voltage & Current Rating: Higher voltage and current ratings demand more robust resistive materials and insulation levels, directly increasing manufacturing costs. This explains why the 13.8kV specification commands a higher price than the 4.16kV unit.

2. Application-Specific Configuration: Variations in protection requirements—such as the inclusion of intelligent monitoring units versus single-phase vacuum contactors for generator protection—directly impact the bill of materials (BOM).

3. Enclosure Material & Environmental Rating: The choice of material (304 stainless steel vs. 201 stainless steel vs. cold-rolled steel) is a significant variable, as material performance under environmental stress directly correlates to cost.

Pro-tip: The figures provided are base estimates. Final procurement costs can fluctuate based on order volume, specific customization requirements, international shipping, and applicable tariff policies. We recommend engaging with the manufacturer directly to align the technical specification with your site's specific ingress protection (IP) requirements and environmental conditions.