20kV Medium Voltage Switchgear/KYN28-24 Withdrawable Type MV Panel Air Insulated Switchgear Power Distribution Cabinet
08-26 2025 | By:
KYN28-24 Withdrawable Type MV Panel Air Insulated Switchgear Power Distribution Cabinet
The 20kV Medium Voltage Switchgear features air insulation, IP4X protection level, and compliance with IEC62271 standards, ensuring reliable performance for indoor power distribution. It supports a rated current of 630-4000A and breaking capacity of 25-50kA, suitable for 50/60Hz applications.
KYN28-24 Withdrawable Type MV Panel Air Insulated Switchgear Power Distribution Cabinet
The switchgear and main apparatus contained in it comply with the latest IEC Standards:
• IEC 62271-1 for general purposes
• IEC 62271-200 for the switchgear
• IEC 62271-102 for the earthing switch
• IEC 62271-100 for the circuit-breakers
• IEC 60071-2 for the insulation coordination
• IEC 62271-106 for the contactors
• IEC 60265-1 for the switch-disconnectors
• IEC 60529 for degree of protections
KYN28-24 Withdrawable Type MV Panel Air Insulated Switchgear Power Distribution Cabinet
a) Air temperature:Maximum temperature: +40℃; Minimum temperature:-25℃
b) Humidity:Monthly average humidity 95%; Daily average humidity 90% .
c) Altitude above sea level:Maximum installation altitude: 2500m
d) Ambient air not apparently polluted by corrosive and flammable gas, vapor etc.
e) No frequent violent shake
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Technical data
|
Rated voltage |
kV |
20 |
|
Rated insulation voltage |
kV |
24 |
|
Rated power frequency withstand voltage |
kV 1min |
50 |
|
Rated lightning impulse withstand voltage |
kV |
125 |
|
Rated frequency |
Hz |
50/60 |
|
Rated short time withstand current |
kA 3 s |
up to 50 |
|
Peak current |
kA |
up to 125 |
|
Internal arc withstand current |
kA 1s |
up to 50 |
|
Main busbar rated current |
A |
up to 4000 |
|
Circuit-breaker rated current |
A |
630 1250 1600 2000 2500 3150 |
|
Circuit-breaker rated current with forced ventilation |
A |
3600 4000 |
Vaccum Circuit Breaker
| Description | Unit | Value | |||||||
| Rated voltage | kV | 20 | |||||||
| Rated short-time power frequency withstand voltage (1min)(1min) | 50 | ||||||||
| Rated lightning impulse withstand voltage (peak) | 125 | ||||||||
| Rated freq | Hz | 50,60 | |||||||
| Rated current | A | 630 | 630 | 1250 | 1600 | 1250 | 1600 | 1600 | 2000 |
| 1250 | 1250 | 2000 | 2500 | 2000 | 2500 | 2500 | 3150 | ||
| 3150 | 3150 | 4000* | 4000* | ||||||
| Rated short-circuit drop-out current | kA | 20 | 25 | 31.5 | 40 | 50 | |||
| Rated short time withstand current | 20 | 25 | 31.5 | 40 | 50 | ||||
| Rated short time continual time | s | 4 | |||||||
| Rated peak withstand current | kA | 50 | 63 | 80 | 100 | 125 | |||
| Rated short-circuit closing current | 50 | 63 | 80 | 100 | 125 | ||||
| Rated single/ back-to-back capacitor bank drop-out current | A | 630/400(40kA is 800/400) | |||||||
| Rated capacitor bank closing inrush current | kA | 12.5(frequency no more than 1000Hz) | |||||||
| Opening time (rated volt.) | ms | 20~50 | |||||||
| Closing time (rated volt.) | 35~70 | ||||||||
| Mechanical life | Times | 30,000 | |||||||
| Rated break times for rated short drop out current | 50 | ||||||||
| Rated operation voltage | V | AC110/220 DC110/220 | |||||||
| Rated current of power storing motor | W | 70 | |||||||
| Average opening speed | m/s | 0.9~1.3 | |||||||
| Average closing speed | 0.4~0.8 | ||||||||
| Rated operation procedure | opening-0.3s-closing opening-180s-closing opening | ||||||||
Fully type-tested
The switchgear has undergone all the tests required by the international (IEC) Standards. Each switchgear unit is subjected to routine tests in the factory before delivery. These tests are intended to provide a functional check of the switchgear based on the specific characteristics of each installation.
IEC type tests
• Short-time and peak withstand current
• Temperature rise
• Internal arc capability
• Dielectric test
• Making and breaking capacity of circuit-breaker
• Earthing switch making capacity (top application)
• Mechanical operations of circuit-breaker and line
disconnector
• IP degree and impact test
IEC routine factory tests
• Visual inspection and check
• Mechanical sequence operations
• Cabling check
• Electrical sequence operations
• Power frequency withstand voltage
• Measurement of the resistance of the main circuits
• Secondary insulation test
Vacuum Circuit Breaker & Protection relay:
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