KYN28 metal clad switchgear


KYN28 indoor metal-clad withdrawable switchgear(hereinafter short as switchgear)is a complete power distribution device for 3.6~24kV,3-phase AC 50Hz,single-bus and single-bus sectionalized system. It is mainly used for power transmission of middle/small generators in power plants; power receiving, transmission for substations in power distribution and power system of factories, mines and enterprises, and starting of large high-voltage motor, etc.,so as to control, protect and monitor the system. The switchgear meets IEC298,GB3906-91.In addition to be used with domestic VS1 vacuum circuit breaker, it can also be used with VD4 from ABB,3AH5 from Siemens domestic ZN65A,and VB2 from GE, etc.,it is truly a power distribution device with good performance.

In order to meet the requirement for wall mounting and front-end maintenance, the switchgear is equipped with a special current transformer, so that the operator can maintain and inspect it in front of the cubicle.

Service environment

a) Air temperature: Maximum temperature: +40℃; Minimum temperature:-15℃
b) Humidity: Monthly average humidity 95%; Daily average humidity 90% .
c) Altitude above sea level: Maximum installation altitude: 1000M.
d) Ambient air not apparently polluted by corrosive and flammable gas, vapor etc.
e) No frequent violent shake

Operating Characteristics

1Rated voltagekV7.2kV, 12 kV,17.5kV,24kV
2Rated frequencyHz50/60
3Rated currentA630,1250,1600,2000,2500,3150,4000
4Branch busbar Rated currentA630,1250,1600,2000,2500,3150,4000
5Main busbar Rated currentA630,1250,1600,2000,2500,3150,4000
61min Power frequency

withstand voltage

7Lightning impulse withstand voltagekV7595/125
8Rated short circuit breaking current (peak)kA40/50/63/80/100
9Short time withstand current(4s)kA20/25/31.5/40
10Protection typeIP4X for housing

Note:*The short circuit capacity should be considered alone.


Overall size and weight

ItemWith VS1,VD4 insideWith VS1,VD4 insideWith 3AH5, ZN65A
Weight (kg)700800900


when the rated current is more than 1600A, cubicle width shall de 1000 mm, and cubicle height will be 1660mm and for schema of rear overhead line in.

1)Width of cabinet:650mm(compound insulation)or 800mm(air insulation) at current<1250A;

2)Width of cabinet:1000mm at current>1250A;

3)Depth of cabinet:1400mm,at cabinet width of 650mm(compoud insulation)when employing the configuration of incoming and outgoing cables;

4)Depth of cabinet:1500mm,at cabinet width of 6800mm(air insulation)when employing the configuration of incoming and outgoing cables;

5)Depth of cabinet:1600mm,when employing the configuration of rear overhead incoming and outgoing cables.

ABL1B1Reference weight Kg
1600 overhead900
1600 overhead1200
9001700(with 3AH5)6004151000



busbar compartment; circuit breaker compartment; cable compartment; low-voltage compartment.
2 – current transformers,
3 – earthing switch,
4 – voltage transformers,
5 – support-bushing insulators,
6 – bushing insulators
7 – surge arresters,
8 – support insulators (reactance),
9 – main busbars.
10 – connecting (distribution) busbars,

11 – earth-fault current transformer,

12 – earthing conductor,

13 – metal movable particions,

14 – cable ducts (optionally),

15 – vent flaps,

Schematics of dimenstons of switchgear


 I1VS1-12 indoor drawable vacuum circuit breaker.

Rated voltage 12kV up to 24kV

Rated current 630A up to 4000A

Rated short circuit breaking current 20kA up to 40kA

Mechanical life 10,000 times

 i2VD4 embeded pole indoor vacuum circuit breaker.

Rated voltage 12kV up to 24kV

Rated current 630A up to 4000A

Rated short circuit breaking current 20kA up to 40kA

Mechanical life 10,000 times

 i3VSM magnetic actuator  indoor VCB

Rated voltage 12kV up to 24kV

Rated current 630A up to 4000A

Rated short circuit breaking current 20kA up to 40kA

Mechanical life 100,000 times

Transportation and Storage

The switch cabinet can be transported by fork truck if guaranteed to be fixed on the bottom plate, and by handling or removing the entire entity if not fixed on bottom plate, but any case it should be transported vertically, no allowance for inversion in order not to damage the internal components.

The switch cabinet(even for that with outer package) should not be exposed outside for storage for a long time. The switch cabinet that needs the long-term storage should be put in the dry and ventilate indoor warehouse. The period of validity of outer package of switch cabinet is normally no more than 1 year.


Free of maintenance for 3 years under the normal conditions.

There is no need of maintenance and any lubrication for the single-spring and dual-spring operation mechanism of load switch.

The relay protection device should be checked by the requirement of the manufacturer before put into the running.

The maintenance periodicity for ring main unit is normally one time every year.

Maintenance by the below requirement:

Fasten all the electrical connectors(main bus bar, switch, cable, measuring meter)required by Installation and Operation Instruction.

Clean all the parts by dust collector(main switch, auxiliary switch, tripping mechanism, motor etc.) and check the appearance.

Have a switching on/off operation for all switches including earth switch.

Turn on auxiliary control electric source not giving the remote control signal to have a electrical order operation.

Clean the busbar cubicle and cable cubicle.


Complete-set Product:

The below documents are attached with the switch panel when out of factory;

Qualification Certificate of Product;

Installation and Operation Instruction;

Packing List;

Engineering Design Document of Product;

Accessory of switch panel :

one operating handle of load switch attached with each complete set;

The customer should offer the following information for order:

Wiring diagram of Main circuit Loop and Special Technical Requirement;

Installation Arrangement Plan of switch panel;

Specification of component inside switch panel and the schematic diagram of auxiliary loop and control loop diagram.

Other written documents specially required..