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■ overview
KYN61-40.5 armored metal-enclosed switchgear is a miniaturized armored metal-enclosed switchgear (switch cabinet for short) developed by our company. This product is suitable for three-phase AC 50Hz power systems, used to receive and distribute electric energy, and control, protect and detect circuits. The switch cabinet has two structural forms: armored cabinet and double busbar cabinet. It can be configured with SF6 circuit breaker, VD4-40.5 circuit breaker, and ZN72-40.5 fully insulated vacuum circuit breaker. The secondary circuit is equipped with advanced and reliable control and protection units. The product adopts APG epoxy casting and reliable solid fully insulated busbar technology for full insulation design. It has good electric field distribution measures. It is a miniaturized switchgear with advanced technology, stable performance, reasonable structure, easy use, safety and reliability.
According to the requirements of the State Grid, Provincial Grid and user feedback information, a new and improved armored product (1400mm cabinet width). Compared with the original structure product, it has been greatly improved in terms of structural technology, insulation performance and protective measures. Without using insulating partition materials, the air insulation distance can meet the requirements of the power system and solve the problem of 40.5kV armored type The problem of insulation performance degradation of metal-enclosed switchgear after long-term operation. This product has passed the internal arc test, and the internal arc level reaches AFLR 31.5kA, 0.5S, which meets the technical requirements of the State Grid and is suitable for substations of 220kV and above and substations with poor operating environments.
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■Conditions of Use
1) Ambient temperature: upper limit +40℃, lower limit -35℃ (storage and transportation allowed at -45℃);
2) Altitude: no more than 1000m (plateau type 3000m);
3) Relative humidity: the daily average value is not more than 65%, and the monthly average value is not more than 60% (where it exceeds the limit, dehumidification equipment needs to be added);
4) The earthquake intensity does not exceed level 8;
5) Install in a place with no risk of fire, explosion, serious pollution, chemical corrosive gas and severe vibration.
■ Technique parameter
No | Item | Unit | parameter | |
1 | Rated voltage | kV | 40.5 | |
2 | Rated frequency | Hz | 50 | |
3 | Rated insulation level | 1min power frequency withstand voltage (to ground, between phases/fracture) | kV | 95/118 |
Lightning impulse withstand voltage (to ground, between phases/fracture) | kV | 185/215 | ||
4 | Rated current | A | 630、1250、1600、2000、2500 | |
5 | Rated short circuit breaking current | kA | 25、31.5 | |
6 | Rated short-circuit breaking current (peak value) | kA | 63、80 | |
7 | Rated short circuit making current | kA | 25、31.5 | |
8 | Rated peak withstand current | kA | 63、80 | |
9 | Auxiliary control circuit rated voltage | V | AC or DC 110/220 | |
10 | Protection level | IP4X(IP2X with circuit breaker door open or inside the compartment) | ||
■ Technical key points
● The structure of the cabinet is optimized to ensure that the clear air distance between live parts and the ground is more than 300. Insulating partitions are no longer installed between phases and rely entirely on air insulation, which reduces the risk of condensation on the surface of the insulating partitions in bad weather. Insulation degradation problem.
● Use circuit breakers and grounding switches with large phase spacing, with the phase spacing reaching 360mm.
● When the distance between circuit breakers is 300mm, the switch cabinet adopts an oblique contact box to ensure an air clearance of more than 300mm.
● The switchgear inspection window adopts explosion-proof double-layer shielded tempered glass, which improves the explosion-proof level of the switch cabinet.
● The transformer installation adopts a withdrawable structure, which is convenient for installation, operation and maintenance.
● The busbar adopts vulcanization process to further enhance the insulation performance.
● Passed the internal arc test, the internal arc level reaches AFLR 31.5kA, 0.5S, and has the ability to resist arc faults.
● It can be equipped with an arc protection device to further enhance the safe operation of the switch cabinet.
■ Outline structure diagram
KYN口-40.5 Dimensional drawing of switch cabinet
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