3.6-24kv Medium Voltage Factory Switchgear

3.6-24kv medium voltage factory switchgear

What is a high-voltage switchgear

1、 Material of high-voltage switchgear cabinet body

1. Cold rolled steel plate or angle steel (used for welding cabinets);

2. Aluminum zinc coated steel plate or galvanized steel plate (used for assembling cabinets)

3. Stainless steel plate (non magnetic)

4. Aluminum plate (non magnetic)

2、 Functional units of high-voltage switchgear:

1. Main busbar room (generally arranged in two structures: "pin" or "1")

2. Circuit breaker room

3. Cable room

4. Relay and instrument room

5. Cabinet top small busbar room

6. Secondary terminal compartment

3、 Functions of the switchgear

The switchgear has functions such as overhead incoming and outgoing lines, cable incoming and outgoing lines, and busbar connection.

4、 Composition of switchgear

The switchgear should meet the relevant requirements of GB3906-1991 "3-35 kV AC Metal Enclosed Switchgear" standard, consisting of two parts: the cabinet body and circuit breaker. The cabinet body is composed of a shell, electrical components (including insulation parts), various mechanisms, secondary terminals, and wiring.

5、 Classification

According to the installation method of circuit breakers

According to the installation method of circuit breakers, they are divided into movable (handcart) and fixed types

1. Mobile or handcart (represented by Y): indicates that the main electrical components inside the cabinet (such as circuit breakers) are installed on withdrawable handcart. Due to the good interchangeability of handcart cabinets, it can greatly improve the reliability of power supply. Commonly used handcart types include isolation handcart, metering handcart, circuit breaker handcart, PT handcart, capacitor handcart, and used variable handcart.

2. Fixed type (represented by G): indicates that all electrical components inside the cabinet (such as circuit breakers or load switches) are installed in a fixed type, and fixed switch cabinets are relatively simple and economical.

By installation location

Divided into indoor and outdoor according to installation location

(1) For indoor use (represented by N): indicates that it can only be installed and used indoors;

(2) For outdoor use (indicated by W): indicates that it can be installed and used outdoors.

6、 According to the cabinet structure

According to the cabinet structure, it can be divided into four categories: metal enclosed armored switchgear, metal enclosed interval switchgear, metal enclosed box switchgear, and open switchgear

(1) The main components of metal enclosed armored switchgear (represented by the letter K), such as circuit breakers, transformers, busbars, etc., are respectively installed in grounded metal partitions separated by metal enclosed switchgear.

(2) Metal enclosed bay switchgear (represented by the letter J) is similar to armored metal enclosed switchgear in that its main electrical components are also installed in separate compartments, but have one or more non-metallic partitions that meet a certain level of protection.

(3) Metal enclosed box type switchgear (represented by the letter X) The switchgear enclosure is a metal enclosed switchgear.

(4) Open type switchgear without protection level requirements, with some parts of the casing being open switchgear

7、 Five prevention measures for high-voltage switchgear

1. After the vacuum circuit breaker car inside the high-voltage switchgear is closed in the test position, the car circuit breaker cannot enter the working position. (Prevent load closing)

2. When the grounding switch inside the high-voltage switchgear is in the closed position, the car circuit breaker cannot be closed. (Prevent closing with grounding wire)

3. When the vacuum circuit breaker inside the high-voltage switchgear is closed, the back door of the panel and cabinet is locked with a mechanical device on the grounding knife. (To prevent accidental entry into live compartments)

4. The vacuum circuit breaker inside the high-voltage switchgear is closed during operation, and the grounding switch cannot be put into operation. (Prevent live hanging of grounding wires)

5. The vacuum circuit breaker inside the high-voltage switchgear cannot exit the working position of the trolley circuit breaker when it is working and closing. (To prevent loaded knife brakes)

Features

1: STRICT protection step to ensure personal safety

2: The cable room can be installed as many as 9 single-core cables

3: Operation and testing positions will be established for the handcart, and both positions are equipped with safe and reliable positioning device and display device

4: The enclosure is completely assembled from aluminized and galvanized steel plate, which are machined and bent by machine tool and then bolted.

5: It has high mechanical strength and its neatness and beauty is ensured.

6: The switchboard door is sprayed with plastic, also has strong capacity of impact resistance and corrosion protection.

7: The primary switch may be provided with VD4 vacuum circuit breaker and C3 series of fixed type load switch from ABB, various domestic vacuum circuit breakers (such as VS1, VH1, VK, ZN28) may also be provided in lieu of the same foreign products.

8: Front door is installed with a observation window to check the operating state of the components inside the room

Service Conditions

◎ Ambient airtemperature: -15°C~+40°C;

◎ Relative humidity: Daily average 95%，and daily average of water vapor pressure < 2.2kPa;

◎ Monthly average «90%, and monthly verage of water vapor pressure < 1.8kPa;

© Altitude: ^1000m;

◎ Seismic intensity: not beyond Ms8.

◎ Ambient air should be free of pollution of corrosive or flammable gas or vapor;

◎ No obvious vibration;

Main technical parameters
Rated voltage	.....................................	kV	3.6、7.2、12
Rated frequency	.....................................	Hz	50
Rated current of circuit breaker	.....................................	A	630/4000
Rated current of switchgear	.....................................	A	630/4000
Rated short-time withstand current (4S)	.....................................	kA	20、25、31.5、40
Rated peak withstand current (peak)	.....................................	kA	50、63、80、100
Rated short-circuit breaking current	.....................................	kA	20、25、31.5、40
Rated insulation level 1min power frequency withstand voltage	Pole-to-pole, pole-to- ground	kV	24、32、42
	Between open contacts	kV	24、32、48
Lightning impulse withstand voltage (peak)	Pole-to-pole, pole-to- ground	kV	40、60、75
	Between open contacts	kV	46、70、85
The shell is IP4X, and it is IP2X when the compartment door and circuit breaker chamber door are opened

 

 

 

 

 

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 contact our sales personnel to obtain design drawings

Here are our customer examples for your reference

IF NEED MORE DETAILES,PLEASE FEEL FREE YO CONTACT US

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