MNS/GCK/GCS Indoor Electrical Switchgear/cabinet/electric Box/switchboard

MNS/GCK/GCS indoor electrical switchgear/cabinet/electric box/switchboard

 

summary

Low voltage switchgear, also known as low-voltage distribution cabinet, is a complete set of low-voltage switchgear and control equipment commonly known. It refers to a complete set of electrical devices with AC and DC voltages below 1000V. Low voltage switchgear is suitable for industries such as power plants, petroleum, chemical, metallurgical, textile, high-rise buildings, etc., and is used for transmission, distribution, and energy conversion. The low-voltage distribution cabinet market in China has maintained a rapid growth trend with the implementation of smart grids, infrastructure construction, investment in manufacturing, and the development of the new energy industry.

application

Low voltage switchgear is suitable for industries such as power plants, petroleum, chemical, metallurgical, textile, high-rise buildings, etc., and is used for transmission, distribution, and energy conversion.

classification

From the perspective of structural mode, it can be divided into fixed type and withdrawable type.

1. Fixed:

It can ensure that all electrical components are reliably fixed in the designated position in the cabinet. The appearance of the cabinet is generally cubic, such as screen type, box type, etc., and there are also prismatic platforms such as desktop. This type of cabinet has a single row and also an arrangement.

2. Withdrawal type:

The withdrawable type is composed of a fixed cabinet body and a movable device part equipped with main electrical components such as switches. The movable part should be light and reliable when moved in, and drawers of the same type and specification can be reliably interchanged. The processing method of the cabinet body in the withdrawable type is basically similar to that in the fixed type.

However, due to the requirements for interchangeability, the accuracy of the cabinet body must be improved, and the relevant parts of the structure must have sufficient adjustment. As for the movable device part, it must be able to be replaced while reliably supporting the main components. Therefore, it must have high mechanical strength and accuracy, and the relevant parts must also have sufficient adjustment.

From the connection method, it can be divided into welding type and fastener connection

1. Welding type:

Its advantages are convenient processing, sturdy and reliable; The disadvantages are large errors, easy deformation, difficulty in adjustment, and lack of aesthetics, and the workpiece generally cannot be pre plated.

2. Fastener connection:

Its advantages are suitable for pre plating of workpieces, easy to change and adjust, easy to beautify, standardized design of components, and pre production inventory. The overall size error of the structure is small. The disadvantage is that it is not as sturdy as welding, requiring high precision of components and relatively high processing costs. Fasteners are generally standard components, mainly including conventional screws, nuts and rivets, pull rivets, pre tensioned and adjustable clamp nuts and pre tensioned pull nuts, as well as self tapping screws. There are also special fastening screws (such as most low-voltage cabinets imported from abroad use special fastening screws).

Selection Guide

Technical parameters commonly used in the selection of distribution cabinets:

1. Maximum rated current of the main busbar: The rated value of the maximum current that the main busbar can carry.

2. Rated short time withstand current: The root mean square value of the short time withstand current that a circuit in the complete set of equipment can safely carry under the test conditions specified in 8.2.3 of the national standard GB7251.1-2005, as provided by the manufacturer.

3. Peak short-term withstand current: The peak current that a certain circuit in the complete set of equipment can withstand satisfactorily according to the manufacturer's regulations under the test conditions specified in 8.2.3 of the national standard GB7251.1-2005.

4. Shell protection level: The level provided by the complete equipment to prevent contact with live parts, as well as the invasion of foreign solids and the entry of liquids, according to the IEC60529 1989 standard. The specific level classification is detailed in the IEC60529 standard.

5. Internal separation method: According to the IEC60529 1989 standard, in order to protect personal safety, the switchgear is divided into several separate compartments in different ways.

6. Functional unit form: According to the national standard GB7251.1-2005, the installation method of components in the complete set of equipment.

When selecting the model of low-voltage switchgear, the following points should be achieved:

1. Choose the most suitable cabinet type based on the actual situation.

2. Try to use domestic cabinet types from well-known domestic manufacturers, and do not blindly choose imported distribution cabinets with high technical parameters, as this can easily cause resource waste.

3. Due to the consistency between the brand of the main components used in the imported distribution cabinet and the cabinet body. So when choosing an imported distribution cabinet, attention should be paid to the parameters of the main components, which must meet the needs.

Maintenance and upkeep

Daily maintenance of low-voltage switchgear:

1. Regularly inspect each cabinet for signs of insect and mouse activity, and regularly trap and kill them.

2. Check if the placement of warning and maintenance signs is correct.

3. Check if emergency tools and lighting fixtures are complete and functioning properly, and if the handle and fuse handle are complete.

4. Check the cable joints for heat and discoloration (usually silver), and the grounding wire for rust (whether the welding points are normal)

5. Check whether the capacitor shell inside the capacitor cabinet is in good condition, whether there is leakage or expansion, and whether the indicator light is in good condition.

6. Check the grounding wire contact of each capacitor shell.

7. Do a good job in cleaning and dust removal for each cabinet.

8. Check the operation of the fans in each cabinet.

matters needing attention

Precautions for operation and maintenance of low-voltage distribution cabinets

1. In principle, the maintenance and repair of electrical equipment should be carried out with a power outage and returned to the circuit for work.

2. The front and rear channels of the low-voltage distribution cabinet should be covered with insulated rubber carpets, and the channels should be free of debris for storage. The lighting should be bright, and leakage water from the house should be promptly treated. Measures should be taken to prevent small animals from entering and exiting buried cables.

3. During peak load current conditions, electrical connections should be checked for overheating and discoloration. If possible, infrared temperature measurement can be used for detection and records should be kept.

4. The secondary circuit wiring is neat, and the wire end numbers are correct and consistent with the drawings.

5. Are the names, signs, and numbers on the low-voltage distribution cabinet clear and correct during operation, and are the positions of operating handles, buttons, etc. consistent with the actual situation on site. Are the signal lights and mechanical indicators correct.

6. The instrument indications are correct and consistent with the changes in the transformer.

7. Does the current and rated current of the low-voltage circuit breaker meet the design requirements. Whether the specifications of the melt core meet the design requirements.

8. Measure the insulation resistance value with a 1000V megohmmeter to be no less than 1 megohm.

9. The drawer type distribution cabinet should be flexible, lightweight, and free from jamming and collision. Mechanical or electrical interlocking devices should operate correctly, and both locking and unlocking should be reliable. The same unit can be interchanged at will.

10. Check whether the insulation of the secondary circuit wires is damaged, aged, or melted.

11. Whether the connection between the busbar and the main electrical appliances, or the contact connection, is reliable, and whether the fastening bolts are loose.

12. Whether the operating mechanism of electrical components is flexible and free from overheating or excessive operating force.

13. Before installation and operation of the distribution cabinet, the surface coating of the cabinet should be checked for damage, the inside of the cabinet should be dry and clean, the arrangement should be neat, the cabinet should be firmly fixed to the foundation, the grounding should be good, and the cabinet door should be properly closed and locked.

Troubleshooting

Common faults and handling methods of low-voltage switchgear

1. The frame circuit breaker cannot be closed

Reason:

(1) Control circuit failure;

(2) After the intelligent release operates, the red button on the panel does not reset;

(3) The energy storage mechanism is not storing energy or the energy storage circuit is malfunctioning;

(4) Check if the withdrawable switch is in place;

(5) Electrical interlock failure.

(6) The closing coil is faulty.

Exclusion method:

(1) Check the open circuit point with a multimeter;

(2) Identify the cause of the trip, eliminate the fault, and then press the reset button;

(3) Manual or electric energy storage. If energy storage is not possible, use a multimeter to check the motor or open circuit point step by step;

(4) Shake the withdrawable switch in place;

(5) Check if the interlocking line is connected;

(6) Check with a visual inspection and a multimeter.

 

 

 

 

 

 

Q5 : Is OEM/ODM available?

A: Yes, it is! Our products can be Customized. We have design and engineer teams,we can customize products according to customers' drawing or requirements.

 

Q6 : You are manufacturer or trading company?
A: We are factory, As a 100% professional manufacturer with 20 year's manufacturer experience, we could produce products according to customers' requirements and we could also control the quality of products 100%.

 

Q7 : Can the price be negotiated?

A: Yes, the price is negotiable. It can be changed according to your quantity or package

 

Q8 : How about inspection?

A: We have the whole inspection system from raw material to end products include temperature rise test,salt spraying test conductor type test,mechanical life test.

 

Q9 : What is payment terms?

A: T.T, Paypal,Western Union,Alibaba trade assurance and L/C is acceptable. 30% T/T in advance ,70% balance before shipment.

 

Q10 : What is the service offered by company?

A: We have the professional engineer team which can design and develop the mold to arrive different customer requirement.

We also have the sales team to offer good service from pre-sale to after-sale.

 

This product is usually customized.
We are a manufacturer and have a professional technical department that can design and provide solutions according to customer needs.
Please click on the button below to send us the information, and our sales personnel will contact you to provide you with the design drawings

 

Here are our customer examples for your reference

Nepalese clients

	GCS LV Withdrawable Switchgear
S.N.	Specifications	Yes/No/If any
	Electrical Panel (Low-voltage withdrawable switchgear cabinet)
	Manufacturer
	Brand
	Type/Model	GCS
	Country of Origin
1	Description of Function
1.1	It is group of low voltage switchgear withdrawable cabinet that can be operated easily and safely.
2	Operational Requirements
2.1	Electrical supply can be disconnected manually and automatically during overload and short-circuit.
3	System configuration
3.1	Low voltage switchgear withdrawable cabinet with all the essential components and copper busbar
4	Technical Specifications	Ratings
4.1	Main circuit rated voltage	400V
4.2	Rated frequency	50Hz
4.3	Rated insultation voltage	690V (1000V)
4.4	Maximum working current of main busbar (copper)	1000A
4.5	Rated withstand current of main busbar	100KA/1s
4.6	Protection Level	IP40
4.7	Operating Mode	Manual and Automatic
4.8	Metal drawer type	8E or 16E or Equivalent
4.8.1	400A Drawer	1 No.
4.8.2	300A Drawer	1 No.
4.8.3	250A Drawer	1 No.
4.8.4	200A Drawer	2 No.
4.8.5	150A Drawer	2 No.
4.8.6	100A Drawer	2 No.
4.9	Outer Dimension	Approx. (80cm X 105cm X 220cm)
4.10	Each drawer must have 3-digital or analog ammeter to measure 3-phase (R-Y-B) current individually
4.11	Busbar must be of copper three phase four wire with protective Earthing (R,Y,B,N,PE).
4.12	The MCCB should be of high quality & sensitive
4.13	The operating mechanism of the drawers must be easy and smooth.
4.14	Drawer Handle must be highly insulated and strong
4.15	The outer dimension should approx match to (80cm X 105cm X 220cm)
4.16	The outer design and color should match as per the design as shown in picture
5	Busbar Tray
5.1	The busbar tray must be installed at the top of the compartment of the functional unit, and the connection line and the common power lne can be put in the tray
5.2	The required number of Busbar should be connected from existing system to installed cabinet by nut-bolt/ Busbar trunking system as per requirement
6	Accessories, spares and consumables

 

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