Switchgear several common structure, and model selection

1. Refuse to switch models to identify
     Electrical and Mechanical Services Department in 1983, developed a model JB/DQ4085 Switchgear Department of the standard methodology. Since then, the development of new products provided for the preparation of this type, so that the model took to the scientific management.

     Switchgear There are two models: one is called Model, with letters to represent the product name, structure, the use of place, design, in the order (by the industry focal point for that award), rated voltage and improve the code, such as characterization. Another called the whole model, from product again after the model specifications, parameters, environmental characteristics such as the composition of the code. Model as follows:

     □ □ □ □ - □ □

     From left to right were used ① ② ③ ④ ⑤ ⑥ on behalf of the above 6 □, which on behalf of the □ 6 mean:

     ① name of the product; ② structure; ③ the use of premises; ④ Design Series serial number; ⑤ rated voltage KV; ⑥ to improve the code. If XGN2-12 (Z) on behalf of the meaning of: X-box high voltage switchboard, G-fixed, N-000, 2 - serial number design ,12-12KV, (Z) - Model circuit breaker ( Vacuum). And the symbol-① ② ③ significance in the following table:

     Product Name ① ② ③ the use of structural characteristics of the place fixed-away indoor users GYNW external box-type switchgear XXGXYXGN, XYN interval switch JJYJYN counter-sheathed Switchgear KKGKYKGN, KYN

     2. Switchgear structure profile

     Several common vacuum switch cabinet structure are:

     1) semi-fixed vacuum refuse GG-1A (F) Z-type.

     2) a fixed box-type vacuum Switchgear

     a. XGN-10 (Z)-counter switch. Yin Xiaxian bus from the room, after a separate spin-GN30 related to the vacuum circuit breakers on the terminal, through the terminal under the current transformer connected to the next switch revolving isolation GN30, cable into the room.

     Source: high voltage switching network

     The use of split-type circuit breaker, such as ZN28A (some manufacturers to switch to switch as a whole), which is the most widely used type of the counter.

     b. GGX2 - 10 (that is, XGN66-10)-refuse to switch. The main features of the cabinet is to adopt a "multi-rotating coaxial transmission intermittent" and a rotating shaft can be manipulated by 3 to 4 bar, in accordance with the procedures established and led the isolation switch grounding switch moves one after another, constitute a natural switch with the switch The relationship between the chain, the program will not be disturbed. The body switches from the cabinet accessories to insert the handle hole spin operation.

     3) refuse to switch between Handcart-JYN □ A 10

     Handcart interval-counter switch in the structure is divided into four small rooms: Room meters, circuit breakers Handcart rooms, rooms and bus cable room. Four small room between the plate packer, used most of the grounding metal partition boards, CD-Handcart circuit breaker plug casing in the vicinity of insulating material used on board and insulation to address the problem, precisely because of this interval was called switch resisting.

     4) Vacuum-sheathed Handcart counter-KYN □ -10

     Is sheathed by the interval-type development comes a similar structure, but all the partitions are grounded metal plates, a higher security. Actuator can be used electromagnetic (CD17), can also be used spring body (CT17 or CT19).

     5) Mid-sheathed counter Handcart

     This is also the removal of a cabinet-style vacuum is to improve the floor-Handcart counter some of the issues and evolution.

In the home is the starting point of the circuit breaker to reduce the high ground, the ground will be moved to the rail in the middle of the insulation layer, the isolation circuit breaker plug on the centerline of the problem less that the car was also greatly reduced weight, the car each circuit breaker Also for better. Handcart Mid-counter use of more expensive price of the overall insulation pieces of molding the entire closed-end vacuum-breaker as a whole (for example, ABB's type WX) or semi-closed vacuum circuit breakers (such as the Toshiba-VK), and Low Voltage Systems The complex process requiring high-precision, so the prices are very high.

     Source: www.hvsi.cn

     

     3. Vacuum switch cabinet selection

     And the power distribution substation, to be completed and acceptance of different users to the task of power distribution, there must be a main circuit system, which features different from the unit to achieve a combination of each functional unit is usually 1 or 2 by side constitute Switchgear. Here the attention of a number of issues for users to switch cabinet selection and design of reference.

     1) Main Line program

     Each switch cabinets, installation manuals have been a variety of connectivity once the main program and its number of forms. Users have to enter under the electric power transmission and the specific situation in the selected form a number of standard connectivity program, they will be together, constitute a line chart and a diagram of the system.

     Main Line in accordance with the functions of the program can be broadly divided into: cable into the round, overhead into the round, so contact measurement, protection, such as changing station modules.

     The switch-off counter, there is usually out of parts: Handcart circuit breakers, isolation Handcart, Handcart voltage transformer, the station changed with Handcart, Handcart arrester, Handcart measures, such as grounding Handcart, which features more than Embodied in the Handcart.

     2) used the main system bus

     Single-bus system is the simplest one. Investment in the province, easy to operate, clear, easy expansion, but when the bus or bus-side isolation switch maintenance, electricity to all; when a circuit breaker path and the failure of the circuit but also power, reliability lower .

     Single sub-bus, a slight improvement over the previous, retained a simple, economic, and the advantages of convenience, but also for a bus or switch faults busbar isolation, not full-time master to power; important for users in I , Ⅱ paragraph for a return to the round, to improve reliability. Source: http://www.hvsi.cn

     Single bus (or sub-sub) plus bypass bus, the structure of some of the more complicated it is usually necessary to increase after the cabinet (deep 600mm). To increase the reliability of power supply, but also a corresponding increase in more investment.

     3) an electrical component inside the same type and specifications

     A diagram of the program, usually marked every once in the body counter circuit components used in the same type and specifications for the procurement of the manufacturer to facilitate the work of preparation. However, the various types of electrical components, the installation of the entire structure of the cabinet's main circuit layout does not impact, almost no effect on the others (such as bus owners, cited under the bus, fuses, grounding switches, surge arresters and so on), some of the impact Large (such as circuit breakers, isolation switches from top to bottom), respectively, to be treated.

     The circuit breaker, which is a major component, users can select to understand. However, the election circuit breaker can not refuse to switch from the model because not all models have circuit breakers installed to any type of switch in the cabinet.

     The isolation switch inside it to have a great impact on the bus, and a lot of variety in itself - a paperback-wall, the guillotine-style version of the switch to different current specifications, to consider the direction of separation fracture, need to consider wearing Actuator installation location, with its interlocking circuit breakers, and so on.

  The main consideration of the current transformer 2:00: ① transformer terminal will sometimes change the direction of a more simple alignment; ② facilitate the procurement of goods, purchase of transport in order to save time.

     4) Switchgear small current, high current specifications

     Some of the more mature Switchgear, during the design specifications for small current (600A below) and the current specification (between 2000 and 3150A) at the same time, reflect the location of the installation of the main bus line with each other, with the series. Low current requirements are usually the main bus with a row of copper, and then use the current 2 to 3 copper bars, after consideration of the reunification of the main bus connections will not be trouble.

     Source: hvsi.cn

     5) the width of the Switchgear

     Current OEM specifications than the width of a small counter-current of a number of wide (width of about 100 ~ 200mm), the same depth. In addition, the product's instruction on the width of the OEM only the width of the angle steel frame, does not include the OEM side of the closure of the thickness of the board; but only with some OEM side of the dam, and some OEM has the right and left. Therefore, considering the size and horizontal cabinet, which must take into account the thickness.

     6) The location of the cable channel

     Some models Switchgear Low Voltage cable from the bottom only the latter part of the round, while some can only win in the first half; certain models of the first half of the existing OEM round, but also the latter part of the round.

     7) overhead into the round

     When overhead into the round program, the switchboard need to install after the cabinet by the cabinet after the top of the wall to wear out or the introduction of casing.

     8) and the installation of the cabinet layout

     Some models have a back door switch cabinet, do not require the installation of the wall; some no back door, only after the board closed with screw fastening, not to require the installation. But no matter what, priority would be no way to install the wall, which is the maintenance repair \ installation, testing both convenient and reduce the power of time to improve power supply reliability rate is good.

     When the switchboard number for a long time, the schedule can be divided into two, two back-to-back or face-to-face can be arranged. In order to better face-to-face manner, the wide field of vision, visits more convenient. 2 For Switchgear between high-Bridge Bus connection, it is important to give accurate installation plan in order to determine the manufacturer of the bus bridge to connect the length and sometimes need to measure the scene.

     9) chain between the counter

     Functional units, most of them in a cabinet to complete the body functions, and some units are required to function in two between the OEM. In this case, some of the misuse of anti-chain to be in the cabinet of the two joint in the body, it is often too much trouble. If the two closely adjacent cabinet, although the complexity of some of the large, there are likely to drive the mechanical interlocking manner; if the two counters separated far, only mechanical process or electromagnetic lock lock ways realization.