Basic Info.
Certification
UL, ISO9001, CCC
Housing
Stainless Steel, Steel Plate
Type 1
Neutral Point Earthing Protection Equipment
Type 2
Neutral Point Grounding Resistance Complete Set
Type 3
Small/Low Current Earth-Fault Line Selectiondevice
Type 4
Transformer Neutral Point Grounding Resistance
Type 5
Generator Neutral Point Grounding Resistance
Type 6
Low-Voltage Grounding Resistance Cabinet
Type 7
Transformer Neutral Point Intermittent Earth
Application
Neutral Point Grounding
Product Description
Neutral point grounding protection equipment
Neutral point earthing resistance complete set
Small/low current earth-fault line selection device
Includes:
1.Transformer neutral point grounding resistance cabinet
2.Generator neutral point grounding resistance cabinet
3.Low-voltage grounding resistance cabinet
4.Transformer neutral point intermittent earth fault protection complete set
5.Small current grounding fault line selection device
Transformer neutral point grounding resistance cabinet
In a cable-powered system, the grounding capacitor current is large. In order to achieve the impact and requirements on the reliability of equipment operation, equipment insulation and protective measures, the neutral point grounding through the resistor can limit the fault current to a moderate size. On the one hand, the relay protection has sufficient sensitivity and selectivity. At the same time, it can only cause local minor damage to the fault point, limit the transient overvoltage to less than 2.6 times the normal line-to-neutral point voltage, prevent the arc from re-ignition, avoid the arc grounding overvoltage to damage the main equipment and expand the accident. At the same time, the resistance damping has a significant effect on preventing ferromagnetic resonance overvoltage.
Generator neutral point grounding resistance cabinet
When a single-phase grounding occurs in the generator circuit of a power plant, and the fault current reaches a certain value, it may cause the occurrence of "intermittent" arc grounding over voltage to have specific "critical" conditions, which cause the generation of arcing grounding over voltage. The withstand voltage level of the generator is weak, and its insulation is easily damaged. If the grounding fault current is too large, the core of the generator will be burnt, and a higher mechanical pressure will be applied to the generator and its circuit.
Therefore, high-resistance grounding is usually used at the neutral point of the generator. When single-phase grounding occurs in its circuit, arc grounding overvoltage is limited to reduce burns to the iron core and reduce mechanical pressure on the generator and its circuits.
Low-voltage grounding resistance cabinet
The low-voltage grounding resistance cabinet is a complete set of resistors for grounding in 0.22KV~0.66KV low-voltage systems. In order to improve the power supply quality of 0.66/0.38/0.22 (KV) low-voltage power systems and reduce equipment outages caused by grounding faults, the low-voltage power system in the main plant of the power plant should use high-resistance grounding, which not only avoids to trip immediately when the phase is grounded not necessary, reduce the probability of burnout when the electrical equipment is running when fuses are used as protective appliances.
After a neutral point grounding resistance cabinet installed, when non-metallic grounding occurs, the current flowing through the grounding point and the neutral point is significantly reduced by the influence of the grounding point resistance, and the non-fault phase voltage rise is also significantly reduced. Zero sequence voltage value is about half that of a single-phase metallic grounding.
Transformer neutral point intermittent earth fault protection complete set
Transformer neutral point intermittent earth fault protection complete set adopts zinc oxide arrester and intermittent parallel operation protection mode, which is suitable for the neutral point of 110KV, 220KV, 330KV power transformers, it not only can protect the transformer neutral point insulation from damaging by lightning overvoltage and power frequency transient overvoltage, but also realize the free switching of two different operation modes of transformer neutral grounding operation or un-grounding operation.
Transformer neutral point intermittent earth fault protection complete set (main transformer neutral point grounding combined equipment) is widely used in power plants and power stations such as thermal power, hydropower and wind power, substations of the state grid corporation, coal mining, steel metallurgy, petrochemical and other large industrial and mining enterprises.
Model description
EN-JXB-1/D(S)
EN: Company code
JXB: Transformer neutral point intermittent earth fault protection complete set
1: System voltage
D:Electric mechanism
S:Manual mechanism
EN-JXB-110
EN-JXB-220
EN-JXB-330
For more details, please kindly contact with us.
Address:
16FL, No.6 Building,No.1 Minyue Road, Jiangbei District, Chongqing, China
Business Type:
Manufacturer/Factory, Trading Company, Other
Business Range:
Electrical & Electronics, Industrial Equipment & Components, Instruments & Meters, Manufacturing & Processing Machinery, Metallurgy, Mineral & Energy
Management System Certification:
ISO 9001, ISO 14001
Company Introduction:
Professional provider of hydropower plant equipments, overhaul, upgrade and spare parts.
Leading supplier of electric power and relative equipments.
Get what you need, we are more closer to you.
Chongqing Enrich Engineering and Technology Co., Ltd(CEETC) is the professional provider of hydropower plant equipments, overhaul, upgrade and spare parts, the leading supplier of electric power and relative equipments in which we have more than 10 years experiences.
Our products are widely used in hydroelectric power plant, power station, power grid, power transmission and distribution...And other relative industries. We are in Jiangbei District, Chongqing, China, which is known as the mountain city and we have the right to engage in import and export, our products have been exported to many countries including Asia, Europe, Central and South America, Africa...., and have been praised by our customers and users.
We adhere to the concept of the source for our development relies on the needs of our customers, our long-term operation aim is taking the concerns of our customers as our priorities, serving our customers with high-quality products and services and occupying more markets with our integrity.
We always adhere to the business philosophy of responsible for our products, responsible for our users and responsible for ourselves, insist on innovation, striving for excellence, and win the customers′ trust with excellent product quality and dedicated after-sales service. We sincerely look forward to working together with more and more new and old customers at home and abroad to bring broader prospects for both of us.
High quality products and focus on our specialty is the true nature of our business.
Quick responses to be more competitive.
Joint development can make our roads further.
Enterprise philosophy: Unity, Realistic, Strive, Innovation.
Quality and objectives: Supply the products with good applicability, satisfied quality, reasonable price and first-rate services to domestic and overseas users.
Sincere Enrich, Serves Customers, Smiles to the future.
Youthful vigor, enables us to have faith and spirit to chase after dreams.
Boundless vitality, helps us accumulate character and courage on the way to explore.
High aspirations, lead us steadfastly to our goals.
To create a bright future, is our responsibility and mission which we are very proud of.
Enrich will make progress together with customers all around the world...
Do what we specialize, Love what we do.
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