Unit AC Metal Closed Loop Switchgear XGN15-12 (SF6)

XGN15-12 (SF6) type unit AC metal-enclosed ring network switchgear (hereinafter referred to as ring network cabinet) is a new generation of high-voltage electrical products that we have successfully designed and developed by ourselves after introducing foreign advanced technology and in accordance with the requirements of domestic agricultural power and urban network transformation. All technical performance indicators are fully IEC62271-200:2003 and GB3906 standards.

The main switch, operating mechanism and components of the ring network cabinet are made of SFL-12/24 switchgear assembled and produced domestically by ABB company or imported parts, and can also be equipped with ABB company's original HAD/US type SF6 according to user needs. Circuit breaker or VD4-S vacuum circuit breaker. Its operation mode is divided into manual and electric.

The cabinet is riveted by numerical control machine tool processing, the protection level reaches IP3X, and has reliable mechanical interlocking and anti-misoperation functions. This product has the characteristics of small size, light weight, beautiful appearance, easy operation, long life, high parameters, no pollution, and less maintenance.

XGN15-12 (SF6) type unit AC metal closed ring network switchgear, suitable for AC 50Hz, 12kV power network, as the acceptance and distribution of electrical energy. The main switch in the cabinet is SF6 switch.

normal conditions of use

● Ambient temperature: upper limit + 40 ° C, lower limit -25 ° C;
Altitude: the altitude does not exceed 2000m;
● Relative temperature: the daily average is not more than 95??? The average is not more than 90%;
● Surrounding environment: The surrounding air is not obviously polluted by corrosive gases or flammable gases, water vapor, etc.
● No frequent violent vibrations.

structural features

Cabinet structure

● The ring network cabinet body is riveted with 2mm thick aluminum-zinc plate (or cold-rolled plate after spraying), and there are two pressure relief holes at the back of the cabinet, one for the cable room and the other for the load switch/busbar room. This structure can maximize the reliability of personal installation and operation of equipment.
● Each compartment
O busbar room:
The busbar chamber is located at the top of the cabinet and connects the adjacent switchgear.
The O-load switch is an independent unit that is internally charged with SF6 gas.
O cable room
Approximately 75 square meters are used for cable connections, fuses, ground switches, and CT and PT installations.
O mechanism chamber with interlock
The chamber contains the operating mechanism and mechanism interlock as well as position indication, auxiliary contacts, trip coils, live display and interlock.
○ Relay box
The relay box is located at the top of the cabinet and is optional. The compartment is used to install special devices such as meters, relays, and motor units.
O circuit breaker room
A circuit breaker (SF6 or vacuum) can be placed below the load switch.
A (
B (
● Pressure relief
Pressure relief above 0
The above is used to release the gas pressure generated in the event of an arc accident inside the busbar and load switch.
Pressure relief below O
The following is the gas pressure generated during an arc accident inside the cable compartment.

basic components
● SFL type load switch (ABB original)
○ The SFL type load switch is a double breakpoint, rotating movable contact, using SF6 gas as the arc extinguishing medium, and the dynamic and static contact is placed in the molded epoxy resin shell with a reinforced structure. At the lead end of the operating shaft is a transparent hot-pressed plastic end cover, through which the state can be observed.
○ Each switch is permanently sealed after being charged with SF6 gas at a pressure of 1.4 bar (SFL means "forever sealed"), and a nitrogen detector can be used to check for gas leakage. There is no limit to the vertical or horizontal installation of the switch. In the unit cabinet, the typical installation method is to place a steel baffle between the cable room and the busbar room and install it horizontally. This installation method encloses the switch shell in a grounded steel plate and isolates the busbar from the cable joint to meet the strictest safety requirements for operation and maintenance.
○ If an internal arc occurs, there is a structural weakness at the back of the shell, which will flush away, diverting the arc gas out of the switch, and then the arc discharge valve above the cabinet is flushed open and directing the overpressure gas outside the cabinet.
● Optional equipment with an auxiliary touchpoint 2 normally closed 2 normally open + extended 2 normally open 2 normally closed a shunt trip coil for SFL with A mechanism.
● Switch SFL12/17.5 IVDP575305RI for K-selector mechanism
SFL24K IVDP575304RI
● Switch of select A mechanism SFL12/17.5IVDP575303RI
SFL24A IVDP575302RI
● VD4-S vacuum circuit breaker (ABB original)
The VD4-S type vacuum circuit breaker is specially designed for unit switchgear, and its breaking capacity is sufficient to handle various conditions, including the operation of normal switching equipment or branch network, as well as the short circuit in special cases.
○ Vacuum circuit breakers are especially suitable for networks that operate frequently within the operating current range. The VD4-S vacuum circuit breaker is equipped with a spring-operated mechanism with a reclosing function (-0.3s-combined-180s-combined), and it operates reliably and has a long service life. The entire circuit breaker includes three vacuum switching bubbles, and the exterior is a simple, vertical structure with resin insulation.
○ Arc extinguishment is the result of the forced displacement of the arc due to the spiral groove of the arc extinguishing contact. Since the minimum static vacuum in the switch insulation is 10-4 to 10-8 bar, a high insulation strength can be obtained despite a relatively small gap between the switch contacts. The arc extinguishes at the first zero of the short circuit current.
Due to the small contact gap, the high conductivity of the metal gas plasma region at the arc voltage drop, and the short arc burning time, the arc energy is extremely low, which is beneficial to the extension of the contact and even the entire switch life.
○ Standard equipment - manual operation
- Electric operation
- Auxiliary touchpoint 2 normally open 2 normally closed
- Shunt trip with position contacts
- Shunt closing coil
Optional equipment - S5 or PR512 overcurrent relay
- Low voltage tripper
- Interlocking coil
Circuit breaker model
VD4 1206-20S
VD4 1706
VD4 2406
● HAD/US SF6 circuit breaker (ABB original)
○ The HAD/US type SF6 circuit breaker is specially designed for ring network switchgear, and its breaking capacity is sufficient to handle various conditions, including normal switching equipment or branch network operation and short circuit breaking under special circumstances. The new generation of HAD has the latest SF6 breaking technology, coupled with a simple structure, which requires very little operating energy. Such a simple energy storage operating mechanism has the characteristics of long mechanical life during use. The circuit breaker can be automatically reclosing operation by selecting a spring operating mechanism.
○ The special structure of the breaking part of the switch can prolong the electrical life. The switch is made of a split independent column structure and placed vertically. The switch adopts the principle of self-energy arc blowing, that is, the arc itself is used to extinguish the arc. When the circuit breaker is switched off, the dynamic and static contacts in the arc extinguishing room generate an arc. The high temperature and ionization effect generated by the arc make the SF6 gas pressure rise rapidly in the arc extinguishing room. With the increase of pressure and the gradual separation of the arc contacts, the gas is forcibly sprayed into the arc extinguishing room through the nozzle, so the arc becomes sparse, cooled, blocked, and prevented from reigniting. Therefore, the moving part of the switch requires very little energy, which further enhances the reliability of long-term operation.

This switch has many advantages:
O arc duration is short, and the insulation strength in the arc extinguishing chamber recovers rapidly.
O Guaranteed safety and reliability even in the most demanding environments.
O can break low inductive and capacitive currents.
O simple operating mechanism, can be quickly split, long mechanical life.
O reduces the wear and tear of contacts and interrupters, and also extends the electrical life.
O allows for a large number of operations, but the maintenance effort is minimal.
O Lightweight construction, compact and stable.

Standard equipment

- Electric operation
- Manual operation
- Auxiliary contacts (2 normally open and 2 normally closed)
- Divided trip, with position contacts
- Shunt coil
- Gas pressure control of signal contacts
Optional equipment - S5 solid overcurrent relay
-PR511-PR512 overcurrent relay
- Low voltage tripper
monobismuth
HAD120625
HAD120520
HAD170620
HAD170616


basic components


● Type K and A operating structures (ABB original)
This mechanism is used to operate load switches and load switches with fuses
○ K-type mechanism: The K-type mechanism is a single spring mechanism used for the splitting operation of the load switch. The splitting of the switch is realized through the spring energy storage through this point. The K-type mechanism can choose a motor for electric operation.
OA type mechanism: A type mechanism double spring mechanism, one of which is used for switch closing and the other is used for switch opening. Before the switch is closed with the closing spring, it should be placed in the energy storage state, and the opening should be made after the closing operation.
Automatically put into the energy storage state. So you can use manual, shunt trip coil or fuse striker to trip.
Mechanism model
- For load switches
-K mechanism 1VDP586042R1
A load-free switch with fuse
Optional equipment
- Operated by motor on the K mechanism
-A mechanism 1VDP575013R1

● SFL-12/24 type switchgear
The main components of OSFL12/24 type switchgear are imported original parts. The switchgear is a double-fracture, three-station, rotating movable contact with SF6 gas as the arc extinguishing medium. The movable contact is placed in the die-casting epoxy resin shell with reinforced structure.
O Each switch is permanently sealed after being charged with 0.4bars air pressure SF6 gas, and can be checked for gas leakage with a nitrogen detector. The switch is vertical and can be installed horizontally. The typical installation method in the ring network cabinet is to place a steel plate between the cable room and the busbar room and install it horizontally. This installation method isolates the busbar from the cable joint to meet the strictest safety requirements for operation and maintenance.
O If an internal arc occurs, there is a structural weakness at the rear of the enclosure, which will be flushed away. Then the arc relief valve above the cabinet opens and directs the overpressure airflow outside the cabinet. Optional equipment 1, auxiliary touchpoint 2 normally closed 2 normally open + extended 2 normally open 2 normally closed - shunt trip coil for SFL with A mechanism.


operation

For the switch equipment with load switch, a special operating handle is used to operate on the front of the switch equipment. The front of the operating mechanism has upper and lower operating holes, the upper part is the ground switch operating hole, and the lower part is the load switch operating hole.

When operating, the handle rotates clockwise to the switch closing direction, and counterclockwise to the switch opening direction. Electric opening and closing devices can also be installed for remote control operation. (Note: Sometimes the load switch does not have a ground switch, and the ground switch operation hole is used as the cabinet door unlocking).

For switching equipment with combined electrical appliances, except for the manual opening button for the opening operation of the load switch, the operation sequence is the same as above. The lower ground switch separately provided in the combined electrical appliance cabinet is divided and connected with the upper ground switch through the connecting rod. Release the residual small current on the lower fuse seat when closing to improve the safety of replacing the fuse.

Outline and installation dimensions (mm)

Order Instructions

●The following information must be provided when ordering:
● Main circuit scheme number, main junction system diagram, arrangement diagram, and floor plan diagram;
●The type, specification and quantity of the electrical components in the switchgear.
●The name and quantity of spare parts and accessories;
If you have any special requirements, please consult with our company.

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