Product introduction

Model meaning

Use and working conditions

GCB-40.5 switch cabinet to implement GB3906-91<3~35KV AC metal enclosed switchgear > national standard, the standard reference to the IEC-298 number of publications.

The components of high voltage switch cabinet assembly includes less oil circuit breaker (or vacuum circuit breaker and hexafluoride sulphur circuit breaker device), operating mechanism, current transformer, voltage transformer, fuse, arrester, power transformers and other. In the device condition, still meet the technical performance of the product.

Structure description

The switch cabinet is a hand car type structure, which is mainly used for air insulation. The insulation distance between each phase of the charged body and the phase is not less than 300mm, and only the individual sector of the individual scheme is provided with a polar barrier.

Switchgear busbar with rectangular aluminium bus level of overhead is arranged on the top of the cabinet, can be observed. Contact bus generally use layout triangular aluminum 50X5 star in the lower part of the cabinet, under special circumstances, when the cable and wire and contact), the restructuring of cross-linked polyethylene cable of solid insulation contact bus.

In addition to the cabinet can be used after the steel mesh screen outside, in order to observe the outside, cabinets and cabinets on both sides, are using the plate door or seal to be protected.

The basic structure of the switch cabinet following the cabinet body and hand trolley and interlocking device:

1, the cabinet

Cabinet body frame is composed of angle steel plate bending and welding, separated into a watch room, room contact isolation, cable head room, room relay, the terminal room and panels, see Figure 2 - 6.

Above the second relay and sign in the middle part of the cabinet handcart room, open two fan portal, hand car can access, second door is provided with an observation window. The second plug fixed in the right portal, the portal is marked with the hand car test position. On the left side of the door is provided with a nameplate and instructions in the cabinet a scheme of line symbol. The door is generally set chamber but not installed accessories, only the change cabinet (101 cabinet) installed for control the electrical low pressure air switch. On the right side of the door, specifically for the Install button control switch and the need to manually re door, the door is the terminal room, the device terminal group, the terminal group is provided in the cabinet lighting lamps and lanterns, is arranged below the ground bolt.

Cabinet of the upper two door steel door, door can be installed instrumentation, indicator, the installation area 2x (800X450mm), inside the door for installing relay chamber, the installation of effective volume is 1600 x 350 * 260mm; small cabinet bus laid along the upper chamber, the left side of the small bus terminal group is arranged in the chamber up laying busbar a total of 15, including two for closing.

The cabinet after lower isolation static contact chamber, when the in and out cable, cable head also installed the in the room below, with contact bus switch cabinet contact bus is through from the chamber and the adjacent cabinet liaison. Cabinet after the upper for isolation static contact chamber. Under a static contact chamber can according to need, installed in the pillar insulator contact seat or current transformer Liuhe, the lower part of the most loaded three sets.

To ensure the safety of local repair, and a static contact between, handcart chamber and the top of the cabinet main busbar between, all equipped with metal separator, for the circuit breaker cabinet, in hand car indoor side at the top of the additional insulation baffle, to prevent interphase flashover caused by circuit breaker jet. Under the isolation contact with handcart room nor between the insulated clapboards. Switch cabinet is provided with a recognition device, the method is: on the side of the portal frame mechanical angle straight column below is provided with a column pin 2 and make it and is arranged on the handcart file blocks are matched and to ensure that similar hand cars are interchangeable, different types of hand car cannot be quasi into.

2, hand car

Hand car skeleton by the angle steel and steel plate bending welded together, see Figure 1. According to the scheme of a line is divided into for the circuit breaker, three-phase and single-phase voltage transformer, arrester, two kinds of isolation and transformer seven hand car. All kinds of hand car operation have metal sealing board protected, upper part and the lower part of the protection plate is arranged on the observation car inspection window, is the central board operation, for installation of the operating handle, the interlocking mechanism and secondary socket.

A ground contact and wheel is arranged at the bottom of the handcart. Car front wheel is fixed; rear wheel is movably. In military vehicles in and out of the line should be will pin bushing for rear wheel shaft is plugged in, allowing the wheels fixed in one direction, the motion outside the cabinet, will pull out the pin wheel now can be with the truck for 360 degree turn and turning is flexible and convenient.

The different truck noninterchangeable identification block installed on the left side of the vehicle is used in conjunction with the identification of pin cabinet.

For transformer hand trolley, the car is equipped with a CJ10-100/3 type AC contactor, as cut off the transformer secondary side load with. On the left side of the truck with the power supply of the secondary side of the transformer is the introduction of air inside the cabinet switch room, a movable contact piece.

3, interlocking device

According to different requirements, the switch cabinet is equipped with mechanical or electrical interlocking device:

(1) the mechanical interlocking device of the circuit breaker, the electromagnetic actuator and the positioning mechanism (CS6) are equipped with mechanical interlock, which can ensure that the breaker is in the state of switch when pulling the circuit breaker.

(2) the breaker handcart and installed in ark not isolated handcart electrical interlocking device. In order to ensure the operation procedure of circuit breaker handcart and isolated handcart, in isolation and the switch cabinet body are respectively provided with an electromagnetic lock (DS) and a travel switch (LX) for dual electrical interlock. The interlocking device ensure separation trolley when fixed in work or testing position, and interlock circuit breaker to closing. Between the two position don't switch on. When two handcart once are connected, and a circuit breaker in the closing state. At this time, the isolation truck don't is pulled.

The interlocking of the hand trolley and the circuit breaker is different according to the main line of the circuit breaker, which can be a single circuit breaker interlocking of a circuit breaker, and can also be a separate hand car interlocking of two circuit breakers.

(3) used in transformer hand trolley equipped with interlocking device. In order to ensure the transformer hand trolley cannot load is pulled, in transformer hand trolley CS6 operating mechanism is provided with a travel switch (LX), CS6 operating mechanism of operating handle control by the contact, when the transformer hand trolley in the closing state, if the pull handle, at this time, LX in primary isolating contact not out before the first disconnect. The assembly in truck as a cutoff for transformer secondary load AC contactor broken, thus ensuring the chat in the belt load Rola hands-on car transformer secondary load is automatically cut.

All the electrical interlock cable and requirements, using the unit should be reflected in the two principle diagram.

To facilitate the construction of ground foundation of distribution room, hand car import and cabinet adopts mobile type rail device, when the need to operate the truck, outer track is arranged in the cabinet can be; when not in use can be remove.

The installation of ground foundation channel steel distribution room must with ground, not prominent.

Schematic diagram of the circuit breaker

Primary circuit scheme

Please provide the following information when ordering:

A. a line scheme number, or a system diagram, and indicates its rated current;

B. two circuit diagram, such as the application of GG-1A type high voltage cabinet of the 129 DC operating standard solution (Z1-Z129) should be marked with the program number and control circuit voltage value;

C. high pressure cabinet plane arrangement chart;

D. when the cable is used in the cable, the long-term operating current and thermal stability current is allowed to be restricted by the section of the cable.