400V GCK Low Voltage drawable Switchgear air circuit breaker main power supply

Cabinet Structure

• Its basic structure is an assembly of C type profiles which made from plate bending with E=25 module installation hole. The whole cabinet and inner compartments are purification treatment of zinc plating. The door panels and side panels are electrostatic sprayed.The cabinet basic structure is as picture.1 and basic size as picture.2 (table 1 and 2)

Cabinet Type

• 1.Power Distribution Center switchgear (PC): can adopt Emax,MT,3WN,AH,ME series circuit breakers. 2.Motor control center switchgear (GCK、GCS、MNS) : it is the assembly of big & small drawer, every circuit main switch is high breaking moulded case circuit breaker or rotation type load break switch with fuse. Power factor automatic compensation cabinet is with manual or automatic and remote power factor compensation device.

• A Power distribution center (PC) cabinet

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  Height	Width	Depth			Remark
  H	B	T	T1	T2
  2200	400	1000	800	200	Main bus transfer
  2200	400	1000	800	200	F s-1250-2000 ME630-1605
  2200	600	1000	800	200	F s-2500
  2200	800	1000	800	200	F s-3200 ME2000-3200
  2200	1000	1000	800	200	F s-4000 ME3205
  2200	1200	1000	800	200	ME4005

   

• B Power distribution center (PC) cabinet

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  Height	Width			Depth			Remark
  H	B	B1	B2	T	T2	T2
  2200	1000	600	400	600	400	200	Single-side operation
  2200	1000	600	400	1000	400	200	Double-side operation

   

• C type composed frame structure (Figure 1)

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• Schematic diagram of cabinet (Fig 2)

Cabinet Compartment Design

• 1)Power distribution center (PC).

• (1)In the PC cabinet ,there has 3 compartments.
  The horizontal busbar compartment is at the back of the cabinet.
  Function unit compartment is at the front of cabinet or the left of cabinet.
  
  (2)The way of compartment: use steel plate between the horizontal busbar compartment and function unit compartment. Use flame retardant polyphenylene oxide plastic shell between the circuit controlling compartment and function unit compartment.
  
  (3)Inner installed air circuit breaker ,which can be operated by manual at outside cabinet when the door is closed. To determine whether the circuit breaker is in the test position or in the service position by observing circuit breaker ON-OFF state and the position between door and controlling systems.
  
  (4)Between the main circuit and auxiliary circuit ,designing the compartments structure to auxiliary electric units like instrument, signal lamps & push buttons etc ,which are fixed on the plastic plate . At the back of this plate, the shell made of flame retardant polyamine foam plastics ,which is separated from the main circuit.

• 2)Withdrawable type motor control center & small current power distribution center (GCK、GCS、MNS):

• Withdrawable GCK、GCS、MNS cabinet ,there also has 3 compartments, that is horizontal busbar compartment at the back of the cabinet, function unit compartment at the front left of the cabinet, cable compartment at the right of the cabinet. Separation of functional panel made of flame retardant foamed plastics between the horizontal busbar compartment and functional units compartment. Separation of steel panel between cable compartment, horizontal busbar compartment and functional unit compartment.

The GCK、GCS、MNS drawer has below 5 types:

8E/4: 200(H) x 150(W) x 400(D) mm	8E/2: 200(H) x 300(W) x 400(D)mm
8E :200(H) x 600(W) x 400(D) mm	16E: 400(H) x 600(W) x 400(D) mm
24E: 600(H) x 600(W) x 400(D) mm

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• 3)The rear structure of outgoing :

• This back outlet is designed for decreasing the arrangement width of the switchgear. Its main busbar is installed horizontally on the top of the cabinet, on the half of back is cable compartment. The incoming cables are all connected in this cable compartment. The front of the switchgear is a device small chamber to install functional units or parts. This system design will move the cable compartment at the side of the panel back ,which hardly decrease the arrangement width of cabinets to further satisfy the space requirements of power substation.
  The width of feeder panel is 600mm,depth 1000/1200 mm. On its top, it is independent of the main bus compartment separated from device small chamber. The height of front device chamber is 72E(E=25mm) which separated from the back cable compartment through the multi-functional panel, fully usage of installation space of the cabinet. Its structure is compact & flexible unit configuration. The back cable compartment is with the door for convenient installation & maintenance . The width of incoming is according to the frame-current of incoming units . Advised width is 400/600/800/1000mm,cabinet depth 1000mm.

Busbar System

• It can be equipped with 2 groups busbar which installed at the back busbar compartment of the switchgear. They are installed upper and lower back of cabinet. According to the needs of the incoming , up and down two sets of busbar can be adopted the materials with same or different cross-section. They can supply power separately ,also can supply power in parallel connection or as backup power source.

The distribution busbar (vertical busbar) assembly in flame retardant plastic functional panel, connected with main busbar through special connection parts to prevent arcing and person contact. The cabinet designs independent PE grounding system & N neutral conductor which installed on the bottom & right of the cabinet. The earthing of each circuit or the connection can be connected at the nearest place. The whole busbar system installation is as Picture. 3. The cabinet frame and structure adopts automatic self-tapping screws which has higher grounding reliability.
The neutral busbar & neutral protective busbar is installed horizontally at the lower place of the functional unit compartment and installed vertically in the cable compartment. If N line and PE line are separated by insulators, N line & PE line should be used separately . If short connection by conductor between them, it will be PE/N line.
 

  

Protect Grounding System

• The protection circuit is made from electrically conductive structural devices & PE lines( or PE/N lines) that are individually mounted and run through the entire length of the array . For the metal structural devices or parts, except the exterior door and seal plates, others are treated by zinc-coated.At the place of structural parts connection , do the carefully design to pass a certain short-circuit current.

Auxiliary Circuit And Cable Tray

• The auxiliary circuit cable tray is installed at the top of the compartment of the functional unit, and the connection line and the common power line can be put in the tray.

Cable And Control Wire Connection

• At the side of withdrawable parts ,in the cable small chamber installed cable connection devices and terminals for connecting outlet cable and controlling line and devices. The wiring device is arranged in the chamber on the right side of the rail cable; Main circuit terminal is at the back; Control terminal is at the front 45°direction.Use screws to connect wires for control terminal or use copper lugs or plug-in type cable lugs. The main circuit terminal of the transfer parts is less than 63A , also with PE terminal blocks.

Safety Protection System

 
Each cabinet has a piece or a set of flame retardant plastic functional board which installed between electrical compartment & main busbar compartment. Its function is preventing arcing caused by fault of switch devices and avoiding the accident caused by a short circuit between the lines. Between the upper & lower drawer, there has metal zinc-coated board with air vent to separate them. Around the smaller 8E/4 、8E/2 drawer is flame retardant type plastic parts. So there is strong insulation isolation between adjacent circuits. A variety of plastic components are used in the cabinet to support the live part . These components are halogen free and it has the anti leakage performance above CT1300 level .
  

Drawer Type

• There has 5 standard sizes based on height of 8E (200mm)
  8E/2: assembly 2PCS drawer type units in 8E space.
  8E/4: assembly 4PCS drawer type units in 8E space.
  8E: assembly 1PC drawer type unit in 8E space
  16E: assemble 1PC drawer type unit in 16E (400mm) space
  24E: assembly 1PC drawer type unit in 24E (600mm) space
  5 types of drawer unit can be assembled in a single cabinet ,can be mixed assembled too. If assembled in a single cabinet, the max drawer No. is as parameter 3.

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  Drawer type	8E/4	8E/2	8E	16E	24E
  Maximum number of units accepted	36	18	9	4	3

   

Electrical And Mechanical Interlocking Of Drawers

The drawer unit has a reliable mechanical interlocking position. It has obvious accuracy in closing, testing, drawing out and isolating position through the operation handle control. The function of the operating mechanism is shown in Figure 4 and figure 5.
To strengthen security , when the handle is positioned, the padlock can be added. Max 3 padlocks can be added. See the left figure. After the drawer unit is positioned , it should be strictly operated as figure 4 & 5 which listed the switch functional operation. Otherwise it is easy to damage the structural device and parts, so please user pay attention to this.
 

  

Schematic - Operation Switch Function

• Figure 4 8E/4 and 8E operating switch function

Figure 5 16E/24E operating switch function

Basic Technical Parameters

1.Electric performance
 

Rated insulation voltage	690V(1000)V
Rated working voltage	380V,400V,690V
Maximum working current of main bus	6300A
Rated withstand current of main busbar	100kA/1s
Main busbar rated peak withstand current	220kA/0.1s
Maximum operating current of branch distribution bus (vertical bus)	2000A
Peak current of distribution bus (vertical busbar):
Standard type	105kA(Max)/0.1s
Reinforced type	176kA(Max)/0.1s
Protection level	IP41