■Product overview

The 8DJ20-12/24KV gas-insulated compact metal-enclosed switchgear (hereinafter referred to as the inflatable cabinet) is a type of gas-insulated compact metal-enclosed switchgear introduced by Daya Electric Group Co., Ltd., which adopts a modular design and is perfectly unified with fixed style and flexible expansion to suit The requirements of end users or network nodes can also meet the needs of various power distribution switching stations, box-type substations, and cable branch boxes. The switch cabinet has the characteristics of fully enclosed, maintenance-free, small size, excellent performance, safe and reliable, long life, and free of charge. Maintenance features are very popular among users.

■Product features

(1) Modular design, each unit module can be combined and expanded arbitrarily without the need for inflation and deflation, which facilitates solution combination and high-pressure metering design, and has a wide range of adaptability. SF6 fully insulated circuit breaker incoming and outgoing line cabinets (vacuum or SF6 arc extinguishing), load switch incoming and outgoing line cabinets, bus tie cabinets, metering cabinets, load switch-fuse combination electrical cabinets, and TV cabinets (with or without switches), The combination scheme can be a single unit, two units, three units, four units and other compact combinations, providing broad application prospects for SF6 fully insulated ring network cabinets or multi-circuit distribution cabinets.

(2) The cabinet adopts an armored structure. There are metal partitions between the busbar room and the switch room, and between the switch room and the cable room. The protection level of the primary part of the fully insulated structure can reach IP67.

(3) The load switch with three positions is welded in a sealed stainless steel shell filled with SF6 gas. It has very good air tightness and consumes less gas. It can guarantee no air leakage for 30 years and meets the requirements of environmental protection. It is suitable for both indoor and outdoor use. It can be used outdoors with a metal or non-metal casing, or placed in underground or semi-underground substations.

(4) The operating mechanism is made of corrosion-resistant metal, and the bearings in the rotating parts are self-lubricating. The product is not affected by the environment, eliminates the need for regular maintenance, and is conveniently connected to the outside world. This results in low operating power, high reliability, and longer life. .

(5) The extension bus uses plug-in silicone rubber connectors, which are fully insulated and shielded to ensure conductive reliability and are not affected by the surrounding environment. The combination connection and expansion are convenient, which facilitates future capacity expansion and transformation of users or substations.

(6) The use of prefabricated silicone rubber insulated cable terminals is plugged in at the front, eliminating the disadvantages of inconvenient cable installation due to the small size and narrow space of the load switch cabinet. It is removable, quick to restore, and easy to install during maintenance; the outer surface uses new semiconductor materials as a shielding layer, and the outer surface is grounded during operation and is not affected by moisture, condensation, dust, dirt, etc., making it safer; maintenance-free; appearance Diverse, novel and beautiful, it can be branched or connected in parallel; it has flood-proof function and can operate under 4.5m of water for short periods of time.

(7) In order to adapt to the requirements of distribution network automation and improve distribution reliability, new multi-circuit distribution cabinets can be equipped with electric mechanisms, TVs and distribution network control terminal units as needed, and have three remote functions. It can realize remote monitoring of main component operating status and faults, remote meter reading, remote operation, etc.

(8) The miniaturized design of the cabinet uses a three-position rotary load switch, which effectively reduces the number of parts and realizes mechanical five-proof interlocking. Vacuum circuit breakers are filled with SF6 gas insulation, taking advantage of the respective advantages of vacuum arc extinguishing and SF6 gas insulation to make the overall structure more compact; current-limiting fuses are also developing in the direction of miniaturization, large capacity, high breaking capacity, and fast fusing. Combined, the cabinets become smaller and smaller.

(9) Friendly operation interface ensures the safety of operators and maintenance personnel. The primary line simulation single-line diagram and analog display can display the internal status of the switch, making the operation simple, correct and safe.

(10) It is completely feasible for the SF6 load switch-fuse combination appliance to replace the circuit breaker to protect transformers of 1250kVA and below. It can not only provide comprehensive and reasonable protection for the transformer, but also has reasonable cost and simple protection. Under the same conditions, users have the ability to purchase maintenance-free products with higher performance levels. Therefore, the technical characteristics of SF6 fully insulated ring network cabinet or multi-circuit distribution cabinet are very obvious, and the load switch factory fuse combination appliance is an ideal product for protecting distribution transformers.