KYN28A-12 12kV Metal-Clad Withdrawable Switchgear

Model Meaning

Product Overview

KYN28A-12 switchgear uses an assembled aluminum-zinc-coated sheet-steel enclosure formed by CNC processing. The circuit breaker, main busbar, cable terminations and relay/instrument equipment are arranged in separate compartments. The withdrawable breaker can be moved between service and test/disconnected positions under the designed interlock sequence, supporting inspection, testing and maintenance planning.

The platform can be configured for incoming feeders, outgoing feeders, transformer feeders, bus couplers, bus-section panels, metering or PT panels and other project-specific functions. Final panel construction and component selection follow the approved single-line diagram and technical schedule.

Working Environment

·Ambient temperature: −10°C to +40°C

·Relative humidity: daily average ≤95%; monthly average ≤90%

·Installation altitude: ≤1,000 m

·Indoor installation free from corrosive or flammable gases, excessive dust, severe pollution and abnormal vibration

·For installation above 1,000 m or under conditions involving condensation, salt contamination, corrosive atmospheres or unusual temperatures, please contact Fengyuan Power for technical evaluation.

Technical Parameters

Technical parameters of switching equipment

No.	Item		Unit	Parameter
1	Nominal Voltage		kV	3.6, 7.2, 12
2	Rated Frequency		Hz	50
3	Circuit Breaker Rated Current		A	630, 1250, 1600, 2000, 2500, 3150
4	Rated Current Of Switchgear		A	630, 1250, 1600, 2000, 2500, 3150
5	Rated Short-Time Withstand Current (4 s)		kA	16, 20, 25, 31.5, 40, 50
6	Rated Peak Withstand Current		kA	40, 50, 63, 80, 100, 125
7	Rated Short-Circuit Breaking Current		kA	16, 20, 25, 31.5, 40, 50
8	Rated Short-Circuit Making Current (Peak)		kA	40, 50, 63, 80, 100, 125
9	Rated Insulation Level	1 min Power-Frequency Withstand Voltage	kV	24	32	42
		Lightning Impulse Withstand Voltage	kV	40	60	75
10	Degree of Protection			The enclosure is IP4X; the doors of the isolation compartment and circuit breaker compartment are IP2X.

 

Technical parameters of VD4, VS1-12 vacuum circuit breaker

No.	Item		Unit	Parameter
1	Nominal Voltage		kV	3.6, 7.2, 12
2	Rated Frequency		Hz	50
3	Rated Current		A	630, 1250, 1600, 2000, 2500, 3150
4	Rated Short-Time Withstand Current (4 s)		kA	16, 20, 25, 31.5, 40, 50
5	Rated Peak Withstand Current		kA	40, 50, 63, 80, 100, 125
6	Rated Short-Circuit Breaking Current		kA	16, 20, 25, 31.5, 40, 50
7	Rated Short-Circuit Making Current (Peak)		kA	40, 50, 63, 80, 100, 125
8	Rated Insulation Level	1 min Power-Frequency Withstand Voltage	kV	42
		Lightning Impulse Withstand Voltage	kV	75
9	Rated Operating Sequence			O - 0.3 s - CO - 180 s - CO
10	Rated Number of Short-Circuit Breaking Operations		Times	50
11	Mechanical Life		Times	20000

 

Mechanical characteristics of VD4, VS1-12 vacuum circuit breaker

No.	Item		Unit	Parameter
1	Clearance Between Open Contacts		mm	11±1
2	Overtravel		mm	4±0.5
3	Phase Center Distance		mm	210±0.5,250±0.5,275±0.5
4	Closing Contact Bounce Time		ms	≤2
5	Three-Phase Opening/Closing Asynchronism		ms	≤2
6	Opening Time at Operating Voltage	Maximum	ms	≤50
		Rated		≤50
		Minimum		≤60
7	Closing Time		ms	≤100
8	Average Opening Speed		m/s	0.9～1.2
9	Average Closing Speed		m/s	0.6～0.8
10	Resistance Of Each Phase Conducting Loop		μΩ	≤40
11	Contact Pressure		N	3200±100

When the circuit breaker is used to control a 3-10 kV motor, if the starting current is less than 600 A, a zinc oxide surge arrester shall be installed. Specific requirements shall be agreed between the user and our company. When the circuit breaker is used for capacitor-bank switching, the rated current of the capacitor bank shall not exceed 80% of the circuit breaker rated current.

 

Operating Mechanism Technical Parameters

No.	Item		Unit	Parameter
1	Rated Operational Voltage	Closing Coil	V	DC220, 110
		Opening Coil	V	AC220, 110
2	Coil Power	Closing Coil	W	245
		Opening Coil	W	245
3	Energy Storage Motor Power		W	50
4	Rated Voltage of Energy Storage Motor		V	DC220, 110
5	Energy Storage Time		s	≤10

 

Main Technical Parameters of ZM-12 (VH1) Main Technical Parameters of Vacuum Circuit Breaker

No.	Item	Unit	Parameter
1	Nominal Voltage	kV	12
2	Rated Frequency	Hz	50
3	Rated Current	A	1250
4	Rated Short-Circuit Breaking Current	kA	31.5
5	Rated Short-Circuit Making Current (Peak)	kA	80
6	Rated Peak Withstand Current	kA	80
7	Rated Short-Time Withstand Current	kA	31.5
8	Rated Short-Circuit Duration	s	4
9	Rated Breaking Current for a Single Capacitor Bank	A	630
10	Rated Back-to-Back Capacitor Bank Breaking Current	A	400
11	Power-Frequency Withstand Voltage	kV	42
12	Lightning Impulse Withstand Voltage	kV	75
13	Rated Number of Short-Circuit Breaking Operations	Times	50
14	Mechanical Life	Times	1000
15	Rated Operating Sequence		O - 0.3 s - CO - 180 s - CO
16	Opening Time	ms	≤60
17	Closing Time	ms	≤75

Typical Panel Functions

Panel function	Typical role
Incoming feeder	Receives power from a transformer, generator, utility source or upstream switchgear.
Outgoing feeder	Distributes power to downstream substations, transformers, motors or process loads.
Transformer feeder	Controls and protects a transformer circuit according to its rating and protection scheme.
Bus coupler / bus section	Connects or sections busbar groups according to the approved operating sequence.
PT / metering panel	Provides voltage measurement, metering or bus-voltage functions where required.
Motor feeder	Supports medium-voltage motor circuits after switching duty and protection requirements are reviewed.
Auxiliary / special panel	Accommodates project-defined isolation, capacitor, earthing or other functions.

Configuration and Protection Options

KYN28A-12 panels can be engineered with a project-approved withdrawable vacuum circuit breaker, current and voltage transformers, earthing switches, surge arresters, protection relays, meters, control switches, live-voltage indication, anti-condensation heaters and communication interfaces. VS1/ZN63 and VD4 vacuum circuit breaker are optional. Exact model, rating, control voltage and compatibility are confirmed for the actual project.

·Circuit breaker: exact manufacturer, model, rating, mechanism and electrical life.

·CT/VT: ratio, accuracy class, burden, core quantity, insulation and mounting arrangement.

·Protection and metering: relay functions, meter type, IEC protocol, SCADA points and time synchronization.

·Auxiliary supply: AC/DC control voltage, trip/close supply, heater supply and UPS interface.

·Cable and busbar interfaces: cable type, number and size; bottom or top entry; bus duct or bus bridge requirements.

Standards, Testing and Documentation

The offered switchgear is reviewed against the customer specification and the applicable IEC, GB/T or other agreed standards. Relevant international references may include IEC 62271-200 for AC metal-enclosed switchgear, IEC 62271-100 for the circuit breaker, IEC 62271-1 for common specifications and IEC 60529 for enclosure protection. The exact standard, edition and evidence scope must be confirmed in the quotation and contract documents.

Project documentation can include an approved single-line diagram, general arrangement, foundation plan, secondary schematics, terminal plans, component schedule, instruction manual, routine-test records, packing list and other agreed deliverables.

Reference Dimensions and Installation Interfaces

Dimension	Value reference
Width	800 or 1000 mm; the catalogue notes 1000 mm for 1600 A and above
Depth	1500 or 1660 mm, depending on the selected arrangement
Height	2300 mm

Cabinet size can still vary with rated current, short-circuit level, breaker selection, busbar arrangement, cable or overhead entry, CT/VT configuration and panel function. Do not finalize civil works from a competitor drawing or a generic online dimension.

Typical Schemes and Ordering Information

The Fengyuan Power catalogue shows scheme families for incoming and outgoing feeders, cable or overhead entry, PT and metering, surge-arrester arrangements, bus coupling, bus sectioning and isolation. The final scheme number and component schedule are selected from the approved SLD.

For an accurate quotation, provide:

·Single-line diagram, panel functions, quantities and lineup arrangement.

·System voltage and frequency, busbar and feeder currents, short-circuit current and duration.

·Control, protection, metering, communication and interlocking requirements.

·Preferred breaker and component brands, CT/VT data and auxiliary supply.

·Cable or overhead entry, cable quantity and size, bus-duct interfaces and switchroom constraints.

·Site conditions, destination-country standards and required drawings, reports and certificates.

Applications

Utility and industrial substations

Power plants and generator auxiliary systems

Mining, metals, cement, petrochemical and process plants

Water, transportation, data-center and large-building power systems

Renewable-energy collection and grid-connection substations

10kV or 11kV nominal systems where 12kV-class equipment is specified

Why Fengyuan Power

Henan Fengyuan Power Technology Co., Ltd. was founded in 2010 and manufactures high- and low-voltage switchgear, compact substations, distribution transformers and vacuum circuit breakers in Henan, China. For KYN28A-12 switchgear projects, the team can review the SLD, prepare a panel-by-panel proposal and coordinate general-arrangement and secondary drawings for approval.

Company certificates and manufacturing credentials are available separately. Product conformity, type-test applicability and component approval remain configuration- and contract-specific.

FAQ

1. What is KYN28A-12 switchgear?

KYN28A-12 is an indoor, air-insulated, metal-clad withdrawable switchgear platform for medium-voltage distribution up to the 12kV equipment class. It combines switching, protection, measurement and control functions in a compartmentalized assembly.

2. Is KYN28A-12 suitable for an 11kV system?

A 12kV-rated assembly is commonly considered for nominal 10kV or 11kV networks, but final selection depends on the system's highest voltage, insulation coordination, earthing method and utility or project specification.

3. What rated current is available?

The supplied Fengyuan Power catalogue lists breaker and switchgear rated currents from 630A to 3150A. The matched rating for each panel and the main busbar is confirmed in the approved lineup.

4. What short-circuit ratings are listed?

The Fengyuan Power catalogue lists 16, 20, 25, 31.5, 40 and 50kA short-circuit breaking and short-time withstand levels, with a 4s duration and corresponding peak values. Availability depends on the selected breaker and cabinet design.

5. Which circuit breaker can be installed?

A project-approved withdrawable vacuum circuit breaker can be selected. The exact model, manufacturer, rating, mechanism, control voltage and spare-parts requirement must be stated or agreed during technical clarification.

6. Can the switchgear be supplied for 60Hz?

The current website baseline is 50Hz. A 60Hz requirement must be reviewed and confirmed in the technical offer before it is advertised or ordered.

7. Is KYN28-12 arc-resistant or LSC2B?

Those classifications are not implied by the model name. Any IAC, LSC or partition-class claim must match the offered construction and applicable type-test documentation.

8. Are the cabinet dimensions fixed?

No. Dimensions depend on current, short-circuit level, breaker, cable entry, CT/VT arrangement and panel function. Use the approved project general arrangement for civil design.

9. What information is needed for a quotation?

Provide the SLD, panel quantities and functions, rated voltage, frequency, currents, short-circuit level and duration, CT/VT data, protection requirements, auxiliary voltage, cable details, site conditions, standards, destination country and delivery requirements.

10. Request a Technical Proposal

Send your single-line diagram and project parameters to receive a panel-by-panel technical and commercial proposal. Complete input data helps Fengyuan Power confirm the lineup, component schedule, ratings, dimensions and drawing scope more quickly.

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