HXGN-12 Ring Main Unit

Model  meaning

Normal  service  condition

◆The upper limit of ambient temperature is+40℃,and the lower limit is -25℃;

◆Altitude should not exceed 2000m;

◆The daily average relative humidity of the air should not exceed 95%,and the monthly average should not exceed 90%;The daily average value of water vapor shall not exceed 2.2×10-3Mpa,and the monthly average value shall not exceed 1.8×10-3Mpa;

◆The ambient air should not be significantly polluted by corrosive or flammable gas,water vapor,etc;

◆No frequent severe vibration.

Main technical parameters

Item name		Unit	Argument
Rated voltage/maximum operating voltage		kV	10/12
Rated current		A	630
Main busbar current	Incoming cabinet	A	630
	Outgoing cabinet		125
Rated short-time withstand current		kA	20
Rated short-circuit duration		s	4
Rated peak withstand current		kA	50
Rated short-circuit making current		kA	50
Rated active load breaking current		A	630
Closed-loop breaking current		A	630
Rated cable charging current		kA	20
Rated short-time withstand current of ground switch		kA	20
Rated short-circuit duration of ground switch		s	4(2)
Rated peak withstand current of ground switch		kA	50
Rated short-circuit making current of ground switch		kA	50
1min rated power frequency withstand voltage	Phase-phase,phase-ground, isolating distance of vacuum load switch	kV	42
	Isolating distance of isolation switch		48
Rated lightning impulse withstand voltage	Phase-phase,phase-ground, isolating distance of vacuum load switch	kV	75
	Isolating distance of isolation switch		85
Mechanical life	Vacuum load switch	Time	10000
	Ground switch(knife),isolation switch(knife)		2000
Take-over current		A	3150

Technical requirement

The ring main unit equipped with FZN □-12/630 vacuum load switch should be able to meet all the corresponding technical requirements of FZN-12/630

vacuum load switch.

This ring main unit is insulated with air and mainly equipped with FZN □-12/630 vacuum load switch.The main solutions include incoming and outgoing cabinets.

◆Incoming cabinet solution

The main circuit of the cabinet has one FZN□-12/630 vacuum load switch,which is equipped with isolation knife and ground knife if necessary.The above three are installed on one frame and interlocked with each other.Therefore,it can achieve the operation of connecting the busbar,isolating and grounding three workstations,and the cabinet can also be flexibly equipped with CT,PT and other components.

◆Outgoing cabinet solution

The main circuit inside the cabinet consists of a FZRN □-12/T200 vacuum load switch,a fuse with an striker(acting as an isolation switch)and a ground knife,which can also achieve three-station operation.The cabinet can also be flexibly equipped with components such as CT/PT and YH series lightning arrester,so sometimes the metering cabinet can be omitted.Both the incoming  and outgoing cabinets are equipped with insulation protective partitions interlocked with the  ground switch.The switches,partitions and cabinet doors inside the cabinet are mechanically  interlocked and meet the "five prevention"requirement.The protection level of the cabinet shell is IP2X.

Use of product

◆Usage

Please strictly follow the following steps,otherwise it may cause damage.

◆Operation sequence of load switch

◇Closing:When the load switch is in the open status,insert the operating handle into the operating hole of the load switch and turn it clockwise(about 180°)to  close  it.

◇When the load switch is in the closed status,it can be operated by manual trip button or trip electromagnet to switch off the load switch.For load switch equipped with fuse with striker,after the fuse is blown,the striker can also switch off the load switch.

◆Power outage operation sequence

◇Switch off the load switch to release the interlock between it and the isolation and ground switch.

◇Insert the operating handle into the isolation and ground switch operating hole,and turn it clockwise (about 90°)to open the isolation knife.

◇After rotating clockwise(about 90°)again,the ground switch quickly switches on.

◇Insert the insulation partition to release the door interlock.

◇ Open the door for maintenance.

◆Power transmission operation sequence

◇Close the cabinet door.

◇Remove the insulation partition and lock the cabinet door.

◇Insert the operating handle into the isolation and ground switch operating hole,rotate counterclockwise(about 90°)to disconnect the ground switch.

◇Rotate the operating handle counterclockwise (about 90°)to disconnect the ground switch.

◇Operate the load switch and switch it on to transmit power.

Fault handling

◆Fault handling

If the fasteners of the ring main unit become loose,the mechanical parts are poorly lubricated,and the vacuum degree of the vacuum extinguishing chamber decreases during operation,methods such as tightening,adding lubricant and applying pressure resistance should be used to check and eliminate the above faults after power outage.

Outline and installation dimension