KYN28-12

Metal-clad withdrawable switchgear

Indoor metal-clad switchgear with withdrawable vacuum circuit breakers for three-phase 3.6–12 kV, 50 Hz systems. Used for receiving and distributing power and for control, protection and monitoring of circuits, with full mechanical and electrical interlocking.

Key parameters

Rated voltage: 3.6; 7.2; 12 kV
Rated current: 630 … 3150 A
Rated short-circuit breaking current: 20; 25; 31.5; 40 kA
Enclosure degree of protection: IP4X

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General information

KYN28-12(Z) (GZS1) is an armoured AC metal-clad switchgear with withdrawable units (hereinafter — switchgear). It is intended for three-phase 50 Hz AC systems: receiving and distributing electrical power, as well as control, protection and monitoring of electrical circuits.

The product complies with IEC 60298 "AC metal-enclosed switchgear and controlgear for rated voltages above 1 kV".

Type designation

KYN28-12-Z

K	Metal-clad (armoured)
Y	With withdrawable units
N	Indoor
28	Design serial number
12	Rated voltage, kV
Z	Vacuum circuit breaker

Service conditions

Ambient air temperature: maximum +40 °C, minimum −15 °C.
Relative humidity: daily average ≤ 95 %, daily average water vapour pressure not more than 2.2 kPa; monthly average ≤ 90 %, monthly average water vapour pressure not more than 1.8 kPa.
Altitude: ≤ 1000 m.
Seismic intensity: not more than 8 degrees.
Ambient air free of noticeable pollution by corrosive or flammable gases, water vapour, etc.
Installation site free of severe vibration.
Operation under conditions beyond the normal conditions — by agreement when ordering.

Design features

Fully metal, modular, assembled construction. The cabinet enclosure is made of aluminium-zinc coated sheet with high corrosion resistance that requires no additional coating; processed on high-precision CNC equipment using advanced multiple-bending technology, joined with rivet nuts and high-strength bolts — high precision, light weight, good strength.

The switchgear can be equipped with VS1, VD4, ZN65 and other series vacuum circuit breakers — wide compatibility and good interchangeability. The withdrawable truck has a service position and a test position; each position is latched and indicated — safe and reliable.

Up to 9 single-core cables can be connected in the cable compartment. The device is equipped with reliable mechanical and electrical interlocks that fully meet the "five interlocks" requirements. Each compartment has a pressure relief channel for personnel safety.

Main technical parameters

Parameter		Unit	Value
Rated voltage		kV	3.6; 7.2; 12
Rated frequency		Hz	50
Rated current of circuit breaker		A	630; 1250; 1600; 2000; 2500; 3150
Rated current of switchgear		A	630; 1250; 1600; 2000; 2500; 3150
Rated short-time withstand current (4 s)		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 short-circuit making current (peak)		kA	50; 63; 80; 100
Rated insulation level: power-frequency withstand voltage, 1 min	Phase-to-phase, phase-to-earth	kV	24; 32; 42
	Across open gap	kV	24; 32; 42
Lightning impulse withstand voltage (peak)	Phase-to-phase, phase-to-earth	kV	40; 60; 75
Lightning impulse withstand voltage (peak)	Across open gap	kV	46; 70; 85
Degree of protection			Enclosure — IP4X; between compartments and with the circuit breaker compartment door open — IP2X

Operating mechanism technical parameters

Parameter		Unit	Value
Rated operating voltage	Closing coil	V	AC/DC 220; 110
Rated operating voltage	Opening coil	V	AC/DC 220; 110
Coil power	Closing coil	W	245
Coil power	Opening coil	W	245
Spring charging motor power		W	50
Rated voltage of spring charging motor		V	AC/DC 220; 110
Spring charging time		s	≤ 10

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