Audited Supplier
NGR
CCC, ISO9001
Metal Film Resistor
High Voltage
Fixed
Withdrawable
AC
Trimming Potentiometer
Duplex
Button Shape
Log Scale
Medical Apparatus and Instruments
0.4kv, 3.3 Kv, 4.16 Kv, 6.3 Kv, 6.6 Kv, 10.5 Kv, 1
50/60Hz
Customized
50A, 100A, 200A, 300A, 500A, 800A, 1000A, 1300A, 1
15 Days~1 Month
xianghu
Safe and Strong Wooden Package
Wenzhou, Zhejiang
8537209000
Product Description
A neutral grounding resistor is composed of enclosure, resistors, disconnecting switch, CT, heater, lightning arrester, etc. The primary purpose of a Neutral Grounding Resistor (NGR) is to limit the fault current already present in a single line to ground fault. That is why NGRs are mostly employed in low and medium voltage (LV and MV) distribution networks to ensure generators and transformers remain protected from damaging currents in the event of an earth fault.
At present, China has a lot of power distribution network using a neutral point resistance grounding runs. After installing the neutral grounding resistor cabinet, when the occurrence of non-metallic grounded affected ground resistance, and the current flowing through the ground than the neutral point earthed metallic significantly reduced, while the sound phase voltage rises too significantly reduced, zero- sequence voltage value is about half of the single-phase metallic grounded. Thus, the use of resistance grounded neutral point, single-phase ground can be reduced when transient over-voltage and over-voltage arc grounding eliminate some resonance over-voltage, and can use a simple protection devices quickly select the fault line, cut point of failure.
Here are some parameters to consider when choosing and sizing an NGR
Δ Rated Line-to-Line voltage or Line-to-Neutral voltage.
Δ Time duration of the NGR will carry the maximum current.
Δ Short time rating: typically, 10 seconds or 60 seconds.
Δ Continuous rating: normally 5% to 10 % of full load current.
Δ Maximum current when the resistor is cold.
Δ Insulation specified based on line voltage.
Δ The maximum short time temperature rise for the resistive element is 760°C, in accordance with IEEE Standard 32-1972 Δ (Requirements, Terminology and Test Procedure for Neutral Grounding Devices).
Δ Ingress protection IP rating for outdoor or indoor enclosures. Standard enclosures are manufactured having IP10, IP13 or IP23.
Δ Enclosure material can be mild steel, finished in powder coat or hot-dip galvanized, or Stainless-steel.
Δ Auxiliary items: Voltage transformers, off-load isolators, current transformers, or other options.
Δ Rated Line-to-Line voltage or Line-to-Neutral voltage.
Δ Time duration of the NGR will carry the maximum current.
Δ Short time rating: typically, 10 seconds or 60 seconds.
Δ Continuous rating: normally 5% to 10 % of full load current.
Δ Maximum current when the resistor is cold.
Δ Insulation specified based on line voltage.
Δ The maximum short time temperature rise for the resistive element is 760°C, in accordance with IEEE Standard 32-1972 Δ (Requirements, Terminology and Test Procedure for Neutral Grounding Devices).
Δ Ingress protection IP rating for outdoor or indoor enclosures. Standard enclosures are manufactured having IP10, IP13 or IP23.
Δ Enclosure material can be mild steel, finished in powder coat or hot-dip galvanized, or Stainless-steel.
Δ Auxiliary items: Voltage transformers, off-load isolators, current transformers, or other options.
The technical parameters of the form are for reference only.
Customized products can consult online customer service!
| Item | Unit | Value |
| System Voltage | kV | 0.4, 3.3, 4.16, 6.3, 6.6, 10.5, 11, 24, 33, 35, customer specified |
| Rated Voltage | kV | 0.4, 3.3, 4.16, 6.3, 6.6, 10.5, 11, 24, 33, 35 /√3 |
| Rated Frequency | Hz | 50 / 60 |
| Short-time Current | A | 50, 100, 200, 300, 500, 800, 1000, 1300, 1600, etc |
| Duration of Fault Current | s | 10, 30, etc |
| Short-time Current Temperature Rise | K | 700, 760 |
| Resistance Value (25 ºC) | Ω | 12, 15, 18, 40, 44, 110, etc ± 5% |
| Resistance Element Material | Stainless steel 304 | |
| Resistivity | μ. Ω .m | 0.73 |
| Temperature Coefficient of Resistor | Ω / ºC | 1.05 × 10 -3 |
| Melting point of resistance material | °C | 1350~1500 |
| Power frequency withstand voltage (1min) | kV | as per design |
| Lightning impulse withstand voltage | kV | as per design |
| Ingress Protection | Outdoor, Max. IP44 with canopy; Or Indoor, IP2X, with flat top | |
| Cable Entry and Out | Incoming: bottom; Outgoing: bottom | |
| Enclosure color | Spray RAL7035 | |
| Enclosure type | Cold rolled steel plate | |
| Operating life | year | 20 |
| weight | kg | About 140(as per design) |
Other than this model we proudly offer a diverse array of other instrument transformers. Our extensive selection caters to the varied needs of our esteemed clientele, ensuring every customer finds the ideal solution for their specific requirements, blending innovation with reliability.
When placing order, please provide the following technical parameters
1. kV rated voltage:
2. rated voltage;
3. Combination of three levels, accurate phase and accurate;
4, rated output, and the corresponding accurate level (VA).
Zhejiang Xianghu Technology Co., Ltd. is a professional manufacturer of high and low voltage switch transmission and distribution equipment and high and low voltage electrical components, the production of fully insulated fully sealed inflatable cabinets, intelligent solid insulated ring host units, outdoor high voltage cable branch box, box-type substation, etc Product quality is stable, reliable, It is deeply trusted and approved by the customers. Our proudly exports its high-quality productsto a myriad of global destinations, with a significant presence in diverse and dynamic countries such as Ghana, Gambia, Ethiopia, the Philippines, South Korea, Bangladesh, Australia, Pakistan, Azerbaijan, Myanmar, and beyond. Our 11kV Current Transformer with 50Hz Frequency for Indoor Use has consistently garnered rave reviews for its impeccable quality and outstanding performance.
Our dedicated team excels in crafting the most cost-effective and innovative power solutions, tailored precisely for our clients' needs. We actively contribute to the design of sophisticated substation and distribution plans and engage in competitive overseas bidding. We have triumphantly addressed and resolved intricate product requirements, ensuring our clients' utmost satisfaction.
Our dedicated team excels in crafting the most cost-effective and innovative power solutions, tailored precisely for our clients' needs. We actively contribute to the design of sophisticated substation and distribution plans and engage in competitive overseas bidding. We have triumphantly addressed and resolved intricate product requirements, ensuring our clients' utmost satisfaction.
Our credentials are bolstered by the acclaimed ISO certification . Additionally, we possess an extensive collection of diverse type test reports that exemplify the unparalleled quality and reliability of our products.
Q1: Are you a trading company or manufacturer ?
A1: We are a professional factory with 7 years experience in the field of high and low voltage power transformers, substation, vacuum circuit breaker, power equipment.
Q2: Do you accept customized serveice ?
A2: We offer OEM/ODM service , can print your logo on product . our professional technical and quotation team can provice a satisfied project according to your drawing and parameters .
Q3: What is your MOQ?
A3: Our MOQ is 1 piece.
A3: Our MOQ is 1 piece.
Q4: How long is your delivery lead time ?
A4: It depends on your product requirement and quantity . Generally , 5~10 working days is avaliable .
Q5: How do you solve quality problems?
A5: Please porvide detailed photoes of quality problems. our technical and quality testing department will analyse.we will make asatisfied soluton within 2 days .
A5: Please porvide detailed photoes of quality problems. our technical and quality testing department will analyse.we will make asatisfied soluton within 2 days .
Q6: What is the price of shipping?
A6: Depending upon the port of delivery, prices varies.
A6: Depending upon the port of delivery, prices varies.
Q7: What is your payment terms ?
A7: 30%T/T in adcance,70% before shipment . West union , L/C are also acceptable
