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KYN28A-12 Metal-Clad Withdrawable Switchgear

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PRODUCT DETAILS

KYN28A-12 Type

Safe and Reliable Metal-Clad Medium-Voltage Withdrawable Switchgear

■Product Overview

The KYN28A-12 metal-clad medium-voltage withdrawable switchgear is suitable for 3-phase AC 50Hz / 7.2-12KV single-busbar and single-busbar section power systems. It is used for receiving and distributing electrical energy, as well as controlling, protecting, and monitoring circuits. This switchgear complies with domestic and international standards such as IEC-60298, GB3906, and DL404.

■Product Model and Its Interpretation

■Operating Environment

◎Ambient Temperature: Upper limit: +40℃; Lower limit: -10℃;

◎Altitude: Not exceeding 1000m;

◎Relative Humidity: Daily average ≤ 95%, Monthly average ≤ 90%;

◎Seismic Intensity: Not exceeding Grade 8;

◎Installed in places free from fire, explosion hazards, severe pollution, chemical corrosion, and violent vibration.

Note: If the above operating conditions are exceeded, please consult the manufacturer.

■Features

◎Fully metal-armored and enclosed, which can effectively prevent the spread of accidents;

◎Complete isolation between low-voltage parts and high-voltage parts;

◎After the door is opened, the protection level reaches IP4X, which can effectively prevent humans and external solids from approaching live parts and moving parts, ensuring personal safety and reliable operation of the equipment;

◎Simple and effective interlocking to prevent misoperation;

◎The cable compartment has sufficient space to connect multiple cables, facilitating installation and maintenance;

◎Good interchangeability of handcarts, making the replacement of circuit breakers very easy.

■Technical Parameters

Item	Unit	Data
Item	Unit	Circuit Breaker Cabinet	F-C Cabinet
Rated Voltage	kV	7.2, 12	7.2, 12
1min Power Frequency Withstand Voltage	kV	32, 42	32, 42
Lightning Impulse Withstand Voltage	kV	60, 75	60, 75
Rated Frequency	Hz	50	50
Rated Current of Main Busbar	A	…4000	…4000
Rated Current of Branch Busbar	A	…4000*	…400
Rated Short-Time Withstand Current (RMS) 4s**	kA	…40	4kA/4S
Rated Peak Withstand Current (Peak)**	kA	…100	10
Enclosure Protection Class		IP4X	IP4X

*: For circuit breakers with rated current of 3150A and above, forced air cooling is adopted for the breaker compartment.

**: The thermal stability and dynamic stability current of the current transformer are related to the transformation ratio, which should be confirmed in detail when placing an order.

■Overall Dimensions and Weight

Item	Specification
Height	2200mm
Width	Rated Current ≤ 1250A: 800 (650*) mm
	Rated Current ≤ 1600A: 1000mm
Depth	Front Maintenance: 1350mm
	Double-Side Maintenance: 1500/1560mm
F-C Cabinet (W × H × D)	650 × 2200 × 1560mm
Weight	800-1200kg

*: This dimension can be used when equipped with VD4 circuit breaker.

■Introduction to the Structure

This switchgear consists of two main parts: the cabinet body and the handcart.

The cabinet body is assembled with bolts, and its outer shell and internal partitions are made of anti-corrosion steel plates. The cabinet body is composed of four different functional units: handcart compartment, busbar compartment, cable compartment, and low-voltage compartment. There are two types of cabinet structures: front-maintenance structure and double-side maintenance structure.

Withdrawable units can be classified by purpose as follows:

• Circuit breaker handcart

• Voltage transformer handcart

• Isolation handcart

• Metering handcart

• Fuse handcart, etc.

Internal Structure Diagram of Front-Maintenance Type Cabinet (Equipped with Conventional Current Transformers)		A: Busbar Compartment
		B: Circuit Breaker Compartment
		C: Cable Terminal Compartment
		D: Low-Voltage Compartment
		1: Busbar
		2: Static Contact Box
		3: Circuit Breaker
		4: Earthing Switch
		5: Current Transformer
		6: Control and Protection Unit
		7: Pressure Relief Plate
		8: Secondary Plug
		9: Cable Terminal
Internal Structure Diagram of Front-Maintenance Type Cabinet (Equipped with Tubular Current Transformers)		A: Busbar Compartment
		B: Circuit Breaker Compartment
		C: Cable Terminal Compartment
		D: Low-Voltage Compartment
		1: Busbar
		2: Static Contact Box (integrated with transformer)
		3: Circuit Breaker
		4: Earthing Switch
		5: Adapter
		6: Control and Protection Unit
		7: Pressure Relief Plate
		8: Secondary Plug
		9: Cable Terminal
Internal Structure Diagram of Double-Side Maintenance Type Cabinet		A: Busbar Compartment
		B: Circuit Breaker Compartment
		C: Cable Terminal Compartment
		D: Low-Voltage Compartment
		1: Busbar
		2: Static Contact Box
		3: Circuit Breaker
		4: Earthing Switch
		5: Current Transformer
		6: Cable Terminal
		7: Control and Protection Unit
		8: Pressure Relief Plate
		9: Secondary Plug

■Handcart Compartment

• Guide rails are installed in the handcart compartment to ensure the stable and reliable movement of the handcart inside the cabinet.

• Metal shutters automatically open and close as the handcart enters or exits. The upper and lower shutters can be opened separately, facilitating operation and maintenance while ensuring personal safety.

• The handcart can be operated when the handcart compartment door is closed. Through the inspection window, the position of the handcart, the closing/opening indication of the circuit breaker, and the energy storage status indication can be observed.

■Cable Compartment

• Usable for connecting:

Single-core cables: Up to 6 cables per phase

Three-core cables: Up to 3 cables per phase

• The cable connection height is above 650mm.

• Optional components:

Current transformer, Voltage transformer, Quick earthing switch, Arrester, Zero-sequence current transformer, Live display device

■Busbar Compartment

• Depending on the rated current, 1 to 3 copper bars are used for the main busbar.

• Adjacent busbar compartments are isolated by bushings and metal partitions, which can effectively prevent the spread of accidents.

• The main busbar and branch busbars are all covered with heat-shrinkable insulating sleeves.

■Low-Voltage Compartment

• Various secondary equipment can be installed in the low-voltage compartment and on its door panel according to different requirements.

• The control busbar is installed on the top plate of the low-voltage compartment and covered with a rotatable partition, facilitating on-site installation.

■Interlocking

The KYN28A-12 switchgear is equipped with a series of interlocking devices, which fundamentally prevent dangerous situations and operations that may cause serious consequences, thus effectively ensuring the safety of operating personnel and the switchgear itself. The following operations of the switchgear can only be performed when the relevant interlocking conditions are met; otherwise, the operation will be blocked.

• Moving the handcart from the test position to the working position:

The circuit breaker or contactor is in the "open" position

The earthing switch is in the "open" position

• Pulling the handcart back from the working position to the test position:

The circuit breaker or contactor is in the "open" position

• Operating the circuit breaker or contactor:

The handcart is locked in the test position or working position

• Operating the earthing switch:

The handcart is locked in the test position

The cable compartment door is closed

Main Technical Parameters of VG1 (ZN63B-12) Type Vacuum Circuit Breaker

Rated Voltage	kV	12
Rated Current	A	630, 1250	630, 1250	1600, 2000	1250, 1600, 2000	2000, 3150, 4000
Rated Frequency	Hz	50
Rated Short-Circuit Breaking Current (RMS)	kA	20	25	31.5	40	50
Rated Short-Circuit Making Current (RMS)	kA	50	63	80	100	125
Rated Thermal Stability Current	kA	20	25	31.5	40	50
Rated Dynamic Stability Current	kA	50	63	80	100	125
Number of Rated Short-Circuit Breaking Operations	Times	50**
1min Power Frequency Withstand Voltage	kV	42
Lightning Impulse Withstand Voltage	kV	75
Rated Breaking Current of Single Capacitor Bank	A	630
Rated Breaking Current of Back-to-Back Capacitor Banks	A	400
Rated Making Inrush Current of Capacitor Bank	kA	12.5 (t < 1000Hz)
DC Component Percentage of Breaking Current	-	50%***
Rated Operating Sequence	-	O-0.3s-CO-180s-CO(≤31.5kA) O-180s-CO-180s-CO(≥40kA)

3150A, 4000A: Forced air cooling

** ≥40kA: 30 times

*** ≥40kA: 40%

Main Technical Parameters of VD4 Type Vacuum Circuit Breaker

Rated Voltage	kV	12
Rated Current	A	…4000*
Rated Frequency	Hz	50
Rated Short-Circuit Breaking Current	kA	…50
Rated Short-Circuit Making Current (Peak)	kA	..125
Rated Short-Time Withstand Current (Peak)	kA	….50
Rated Peak Withstand Current (Peak)	kA	.…125
1min Power Frequency Withstand Voltage	kV	42
Lightning Impulse Withstand Voltage	kV	75
Rated Operating Sequence	-	O-0.3s-CO-180s-CO (≤31.5kA); O-180s-CO-180s-CO (≥40kA)

Forced air cooling is adopted.

** 4 seconds at 31.5kA.

■Main Circuit Scheme

■ Overall Dimension Diagram of Switchgear

Switchgear Parameter	Width (mm)
Rated Current ≤ 1250A	800
1250A < Rated Current ≤ 4000A	1000
Station Transformer ≤ 30kVA	1000
F-C Cabinet	650/800

■ Single-Row Arrangement Diagram of Switchgear

■ Opposite-Row Arrangement and Busbar Bridge Diagram of Switchgear

■ Installation Foundation Diagram of KYN28A-12 (Depth: 1500mm)

■ Floor Opening and Fixing Points of KYN28A-12 (Depth: 1500mm)

■ Installation Foundation Diagram of KYN28A-12 (Depth: 1560mm)

■ Floor Opening and Fixing Points of KYN28A-12 (Depth: 1560mm)

■ Installation Foundation Diagram of KYN28A-12 (Depth: 1350mm)

■ Floor Opening and Fixing Points of KYN28A-12 (Depth: 1350mm)

■ Instructions for Product Ordering

The following technical documents shall be provided by the user when placing an order:

◎ Single-line system diagram of the primary main wiring scheme and the model/specification of the main busbar;

◎ Secondary schematic diagram and terminal arrangement diagram for each cabinet; if there is no terminal arrangement diagram, it shall be arranged by the manufacturer;

◎ Layout diagram of the secondary small busbar and the type of small busbar;

◎ Plan layout diagram and relevant cross-sectional diagrams of the power distribution room;

◎ If a busbar bridge (inter-cabinet busbar bridge or wall-cabinet busbar bridge, protection class: IP2X) is required, the span and height dimensions shall be provided;

◎ Summary table of electrical equipment;

◎ Regional special requirements and special operating environments shall be specified when placing the order;

◎ If other or additional accessories and spare parts are required, their types and quantities shall be specified.

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