250-630A Neutral Point Grounding Switchgear/ Resistance Cabinet in Power Distribution System

• Customization: Available
• Certification: CCC, ISO9001
• Shell Material: Stainless Steel
• Model NO.: JCG
• Installation: Fixed
• Structure: Cabinet
• Current: AC
• Customization: Acceptable
• Currency: RMB or USD
• Language: Chinese, English, Russian
• Loading Port: It Depends
• Rated Voltage: 6-35kv
• Frequency: 50~60Hz
• Transport Package: Wooden Case or Others
• Specification: As required
• Trademark: HZEC
• Origin: China
• Production Capacity: 100000 Sets/Year

Product Description

Company Profile

Henan Energy Electric Equipment Co., Ltd. was established in 2011 and is an excellent and reliable power equipment manufacturer in China. The company mainly develops and produces oil-immersed transformers, dry-type transformers, box-type substations, high-voltage switches, and medium and low voltage complete sets of equipment. The equipment put into production and operation of the project advocates energy saving, intelligence, informatization, and mechanization. The company has established the Henan Triangle Energy-saving Transformer Engineering Technology Research Center, with 71 utility model patents and 15 invention patents. With years of accumulation in the transformer industry and strong technological innovation capabilities, HZEC products are sold to the Middle East, North America, South America, Europe, Southeast Asia, Africa, and other regions, covering more than 40 countries.

Product Description

 

The generator neutral grounding switchgear is a kind of electrical equipment which is developed for various big data center projects arising from the vigorous development of network communication industry at home and abroad and is matched with the generator set. At present, it has been widely used in important power user distribution networks such as power distribution of Unicom/mobile/telecom cloud computing data centers and power plant power systems.
Executive standards:
DL/T620-1997
GB/T16927.1-1997
GB14808-93
GB4208-93
IEEE32-1972

Working Principle

There are several generators running side by side in the system, and their neutral points can be connected to the neutral point resistor and grounded through a single phase high voltage vacuum contactor.

The basic control principle of the generator neutral grounding switchgear can be realized according to the needs of customers at a certain time in the system only 1 generator neutral grounding through the resistor; Or multiple grounding units corresponding to the running state of the generator. Contactor control mode includes automatic and manual, configure the transfer switch to achieve switching, manual control by our company through the button or knob to achieve the contactor closed and disconnected, automatic mode requires the customer to provide generator outlet circuit breaker passive normally open contact signal; Under the automatic control mode, the switching of multiple contactors can be automatically controlled by the customer, or by our company. Our company adopts Siemens PLC programmable logic controller to realize the automatic control of multiple contactors, and can also use relay contact chain to realize the control of contactors.

The generator neutral point grounding switch cabinet is equipped with a resistance cabinet to ground the generator neutral point through a resistor. The generator neutral point grounding switch cabinet and the resistance cabinet are connected with a single-core cable, which is provided by the user. If the number of contactors is small, it can also be considered that the contactor and the resistor are installed in a cabinet.

Contactor selected JCZ type, rated current 250A, 400A, 630A different grades, the control power supply is usually DC220V.

Service Environment

1. Altitude: not more than 3000m;
2. Ambient temperature: -30ºC ~ +50ºC;
3. Relative humidity: not more than 95% (25ºC);
4. Installation site: the air does not contain chemical corrosion gases and vapors, no dust;
5. Power grid frequency: 48 ~ 52Hz (50 Hz system), 58 ~ 62 Hz (60 Hz system);
6. Suitable for: indoor, outdoor;
7. Installation point: normal neutral displacement does not exceed 3% of the operating phase voltage.

Packaging & Shipping

When packing the product, place it on the base of the packing box and fasten it with bolts. The cabinet is covered with plastic film to prevent dust or water vapor immersion during transportation or storage; The delivery place, equipment name and transportation weight are clearly marked on the resistance cabinet packing box; After the goods arrive, use forklift or crane to unload; Inspection should be carried out before discharge to ensure that the goods are safe and undamaged during transport. It is recommended that the equipment be delivered to the installation site in its original packaging to prevent possible damage during transportation.

Installation

Before installation, the foundation, grounding system, cable trench, inlet and outlet cables and protection pipes should be prepared. During installation, the relevant standards and regulations should be met. The insulation distance between the devices should meet the requirements of the corresponding voltage level, and the requirements of ventilation, heat dissipation, installation and maintenance of the devices should be considered.
Use a forklift truck to transport the device to the installation site, remove bolts securing the base, and carefully unpack the device to prevent damage to the shell, top or side sleeve (if any). When using a forklift truck, align the forklift truck with the Angle steel of the bottom shell to avoid damaging the base plate of the device.
This product can be installed on a special foundation or concrete platform, and placed horizontally. Secure the cabinet to the base with ground bolts through the bolt holes at the bottom of the cabinet. If the cabinet is installed on a concrete foundation, you are advised to use expansion bolts.

Order Instruction

1. Rated voltage of the system: (kV);
2. The number of contactors: according to the number of generators;
3. Whether to install the current transformer (CT) : CT ratio and capacity, compound error;
4. Input and output cable mode: upward down out, down in down out, optional;
5. Material, (IP) protection level, color code and installation location of the cabinet.

Certifications