Transformer Neutral Grounding Resistor
Mainly used for power transmission and distribution systems below 110kV, mainly composed of cable lines, single-phase grounding faults with large capacitance currents, and power plant auxiliary power systems with small capacitance currents but to prevent resonance overvoltage. According to different capacitor currents, it can be divided into high resistance grounding and low resistance grounding.
Application areas:
Mainly used for power transmission and distribution systems below 110kV, mainly composed of cable lines, single-phase grounding faults with large capacitance currents, and power plant auxiliary power systems with small capacitance currents but to prevent resonance overvoltage. According to different capacitor currents, it can be divided into high resistance grounding and low resistance grounding.
Product application:
A neutral point grounding resistor is a current limiting electrical protection device connected between the neutral point of a generator or transformer and the ground. When a fault occurs in the power grid, the neutral point voltage of the power supply will be offset, especially in cable powered power grid systems. When the capacitance current to ground is large, arc grounding overvoltage will be generated when the current is greater than the specified value, which greatly increases the ground voltage of the non fault phase and causes insulation damage to the equipment, resulting in two-point or multi-point grounding short circuit and power outage accidents. The purpose of using neutral point resistance grounding method is to inject resistive current into the fault point, making the grounding fault current have resistance capacitance properties, reducing the phase difference with voltage, lowering the reignition rate of the fault point current after zero crossing and arc extinguishing, limiting the overvoltage within a certain level, improving the sensitivity of relay protection equipment to achieve tripping, rapid search for fault lines and backup switching, and effectively protecting the normal operation of the system.
The neutral point grounding resistor of transformers is widely used in the secondary and stator side neutral points of transformers and generators. After connecting a resistor in series with the neutral point of the equipment (or using a grounding transformer to lead out the neutral point), intermittent arc overvoltage electromagnetic energy is discharged, causing the neutral point potential to drop and the speed of fault phase recovery voltage rise to slow down, thereby reducing the possibility of arc reignition, suppressing the amplitude of grid overvoltage, and enabling selective grounding protection.
Mainly used for power transmission and distribution systems below 110kV, mainly composed of cable lines, single-phase grounding faults with large capacitance currents, and power plant auxiliary power systems with small capacitance currents but to prevent resonance overvoltage.
According to different capacitor currents, it can be divided into high resistance grounding and low resistance grounding. At present, neutral grounding resistors are widely used in urban distribution networks, large industrial parks, power plants, offshore platform distribution systems, and large chemical enterprises.
Product features:
Technical features:
Maintenance free, quick and convenient disassembly and replacement
Compact structure, easy to install
Shell protection level: IP20～IP56
Optional accessories:
Application environment:
Surrounding air temperature:+ 40℃— -15℃
Altitude: 1000m, 3000m
Minimum nominal creepage distance: ceramic material not less than 18mm/kV
Organic material not less than 20mm/Kv
Surrounding air temperature:+ 40℃— -35℃
Altitude: 1000m, 3000m
Minimum nominal creepage distance: Level II: 20mm/Kv, Level III: 25mm/kV, Level IV: 31mm/kV
Note: When exceeding normal usage conditions, it shall be determined through consultation between the user and the manufacturer.
Ordering Notice:
We are willing to serve you with our professionalism, sincerity, and integrity.
Precision Fault Current Limiting
ZHIYOU’s Transformer Neutral Grounding Resistors are engineered to precisely limit ground fault currents, ensuring fast system response while protecting sensitive components. Ideal for both low-resistance and high-resistance grounding of electrical equipment in critical transformer systems.
Versatile Integration with Grounding Assemblies
Our resistors are compatible with full Neutral Grounding Assemblies, and can be deployed within Neutral Grounding Resistor Cabinets, High-Voltage Grounding Resistor Cabinets, or mounted independently for flexibility in field conditions.
Broad Range of Industrial Applications
Designed for transformers, generators, and complex grid systems, ZHIYOU’s resistors also function as Filter Resistors, Damping Resistors, and Starting Resistors, supporting load transition, harmonic mitigation, and system startup needs.
Durable Materials with Stable Resistance
Each unit uses stainless steel alloy elements offering excellent thermal properties and long-term resistance accuracy. This ensures reliable performance under high current surges or prolonged fault conditions in grounded electrical equipment.
Customizable to Voltage & Load Demands
Available from low voltage up to Ultra High Voltage Filter Resistor standards, supporting Load Banks, Braking Resistors, and Generator Test Load Bank environments. ZHIYOU provides fully customizable resistance and insulation levels for different system protection requirements.
About Us
Shanghai Zhiyou Electric Manufacturing Co., Ltd. is a leading manufacturer of power transformers, reactors, resistors, and complete electrical equipment, serving a diverse range of industries worldwide.
Core Manufacturing Capabilities and Quality Assurance
Production Strength
Global Reach: Our products are exported to 86 countries and regions, including North America, South America, Europe, Southeast Asia, the Middle East, and Africa.
Sustainability Initiatives
Environmental Commitment: We adhere to ISO 14001 environmental management standards, reflecting our dedication to sustainable manufacturing practices.
Customer Collaboration Process
Global Service Capability
Based in Shanghai, China's economic hub, we leverage our strategic location to offer efficient and reliable services to clients worldwide. Our international certifications and extensive export experience underscore our commitment to global standards and customer satisfaction.
Partner with Shanghai Zhiyou Electric Manufacturing Co., Ltd. to experience excellence in electrical solutions tailored to your needs.
FAQ
Who are we?
We are Shanghai Zhiyou Electric Manufacturing Co., Ltd., a factory established in 2007, specializing in the production of power transformers, reactors, resistors, and complete electrical equipment. Our factory is located in Shanghai, China.
How can we guarantee quality?
We have obtained ISO 9001 international quality management system certification and ISO 14001 international environmental management system certification. All products undergo testing and certification by authoritative institutions, ensuring compliance with or exceeding national and international standards.
What can you buy from us?
Our product range includes:
Why should you buy from us and not from other suppliers?
With over 18 years of manufacturing and R&D experience, we offer high-quality products at competitive prices. Our products have been exported to 86 countries and regions, and we have established a reputation for reliability and excellence.
What services can we provide?
We offer comprehensive services, including:
Secure reliable fault current control for your transformer systems with ZHIYOU’s high-performance Transformer Neutral Grounding Resistors. Contact us now to receive expert support and competitive pricing tailored to your grounding application needs.
