KYN28 Series Withdrawable Metal Clad Switchgear - Reliable China Suppliers and Factory for 2.5-34.5kV Solutions
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.
General
The switchgear meets IEC298, GB3906-91. In addition to be used with domestic VSI 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
Air temperature: Maximum temperature: +40℃; Minimum temperature: -15℃.
Humidity: Monthly average humidity 95%, Daily average humidity 90%.
Altitude: Maximum installation altitude: 1000M above sea level.
Air Quality: Ambient air not apparently polluted by corrosive and flammable gas, vapor etc.
Stability: No frequent violent shake.
Structure & Basic Components
Overall Size and Weight
| Item | With VS1, VD4 inside | With VS1, VD4 inside | With 3AH5, ZN65A |
| W×D×H (mm) | 650×1400×2200 | 800(1000)×1500×2200 | 800(1000)×1700×2200 |
| Weight (kg) | 700 | 800 | 900 |
Notice:
When the rated current is more than 1600A, cubicle width shall be 1000 mm, and cubicle height will be 1660mm for schema of rear overhead line in.
1) Width of cabinet: 650mm (compound insulation) or 800mm (air insulation) at current 2) Width of cabinet: 1000mm at current > 1250A;
3) Depth of cabinet: 1400mm at 650mm width (compound insulation) for incoming/outgoing cables;
4) Depth of cabinet: 1500mm at 800mm width (air insulation) for incoming/outgoing cables;
5) Depth of cabinet: 1600mm for rear overhead incoming and outgoing cables.
When the rated current is more than 1600A, cubicle width shall be 1000 mm, and cubicle height will be 1660mm for schema of rear overhead line in.
1) Width of cabinet: 650mm (compound insulation) or 800mm (air insulation) at current 2) Width of cabinet: 1000mm at current > 1250A;
3) Depth of cabinet: 1400mm at 650mm width (compound insulation) for incoming/outgoing cables;
4) Depth of cabinet: 1500mm at 800mm width (air insulation) for incoming/outgoing cables;
5) Depth of cabinet: 1600mm for rear overhead incoming and outgoing cables.
| A | B | L1 | B1 | Reference Weight (Kg) |
| 650 | 1400 | 380 | 315 | 700 |
| 800 | 1500 | 530 | 315 | 800 |
| 1600 overhead | - | 900 | ||
| 1000 | 1500 | 730 | 490 | 1100 |
| 1600 overhead | - | 1200 | ||
| 900 | 1700(with 3AH5) | 600 | 415 | 1000 |
Structure Features
1) Compartments: Busbar compartment, circuit breaker compartment, cable compartment; low-voltage compartment.
1 - Main device: VCB/Contactor
2 - Current transformers
3 - Earthing switch
4 - Voltage transformers
5 - Support-bushing insulators
6 - Bushing insulators
7 - Surge arresters
8 - Support insulators
9 - Main busbars
10 - Connecting busbars
11 - Earth-fault transformer
12 - Earthing conductor
13 - Metal movable partitions
14 - Cable ducts (optional)
15 - Vent flaps
2 - Current transformers
3 - Earthing switch
4 - Voltage transformers
5 - Support-bushing insulators
6 - Bushing insulators
7 - Surge arresters
8 - Support insulators
9 - Main busbars
10 - Connecting busbars
11 - Earth-fault transformer
12 - Earthing conductor
13 - Metal movable partitions
14 - Cable ducts (optional)
15 - Vent flaps
Schematics of Dimensions
* Dimension in brackets means dimension of heavy-current cubicle.
Main Components Characteristics
 |
VS1-12 Indoor Drawable VCB Rated voltage 12kV-24kV; Rated current 630A-4000A; Rated short circuit breaking 20kA-40kA; Mechanical life 10,000 times. |
 |
VD4 Embedded Pole Indoor VCB Rated voltage 12kV-24kV; Rated current 630A-4000A; Rated short circuit breaking 20kA-40kA; Mechanical life 10,000 times. |
 |
VSM Magnetic Actuator Indoor VCB Rated voltage 12kV-24kV; Rated current 630A-4000A; Rated short circuit breaking 20kA-40kA; Mechanical life 100,000 times. |
Transportation, Maintenance and Order
Transportation and Storage: The cabinet should be transported vertically. Long-term storage should be in a dry and ventilated indoor warehouse. Outer package validity is normally 1 year.
Maintenance: Free of maintenance for 3 years under normal conditions. Maintenance periodicity is normally once per year, including fastening connectors, cleaning parts with dust collectors, and checking switching operations.
Order Requirements
Complete-set Product Documents: Qualification Certificate, Installation Instruction, Packing List, Engineering Design Documents.
Order Information Needed: Wiring diagram of Main circuit Loop, Installation Arrangement Plan, Specification of internal components, and schematic diagrams for auxiliary/control loops.
Frequently Asked Questions (FAQ)
Q1: What is the primary application of KYN28 switchgear?
A: It is mainly used for power transmission in power plants, substations, and industrial power systems (factories/mines) for control, protection, and monitoring of 3.6~24kV systems.
Q2: Which vacuum circuit breakers are compatible with this switchgear?
A: It is compatible with VS1, ABB’s VD4, Siemens’ 3AH5, domestic ZN65A, and GE’s VB2 vacuum circuit breakers.
Q3: What are the environmental operating limits?
A: It operates within a temperature range of -15℃ to +40℃, at altitudes up to 1000M, and in environments with monthly average humidity up to 95%.
Q4: Does the KYN28 switchgear require frequent maintenance?
A: No, it is designed to be maintenance-free for 3 years under normal conditions. Standard inspections are recommended once per year.
Q5: Is front-end maintenance possible with this design?
A: Yes, the switchgear is equipped with special current transformers allowing operators to maintain and inspect the unit from the front of the cubicle.
Q6: What documents are provided upon delivery?
A: Each unit comes with a Qualification Certificate, Installation and Operation Instruction, Packing List, and Engineering Design Documents.