CN105490122A - Screen-top miniature bus bridging-connection cable - Google Patents

Abstract

The invention discloses a screen-top small busbar jumper connection cable, which solves the technical problems of time-consuming, laborious and dangerous operation methods in the prior art when replacing the protective screen. The screen-top small busbar jumper connection cable of the present invention The wire includes four wires, the two ends of the wires are respectively connected with conductive small bus clamps, and one of the small bus clamps connected to the two ends of the wires is provided with a voltage indicating mechanism for testing the voltage difference between the two ends of the wires.

Description

A screen-top small bus bar jumper connection cable

【Technical field】

The invention relates to a screen-top small busbar jumper connection device when a protective screen is replaced by a relay protection device in an electric power system, in particular to a screen-top small busbar jumper connection cable.

【Background technique】

At present, there are a large number of relay protection devices of 110kV and above in the power grid system that need to be replaced, and the replacement generally adopts the method of replacing the entire protective screen. Most of the AC power supply, DC power supply and secondary AC bus voltage of the relay protection device in the old substation adopt the power supply mode of the small bus on the screen top. At present, the process of replacing the protective screen is as follows: before removing the protective screen to be replaced, it is necessary to bridge the copper round small bus bar on the top of the screen. In order to ensure that other operating protective screens do not lose power, Must be done live. The current practice is to connect temporary cables across the protective screen to be replaced. The small busbar generally includes a protective power busbar, a control power busbar, and a secondary AC voltage busbar. The cable core needs to be connected to the small busbar terminal block on the top of the adjacent protective screen. , Remove the protective screen to be replaced after the temporary cable of the small busbar is connected. After replacing the protective screen with a new one, connect the small bus bar on top of the screen and remove the temporary cable. During the lap joint operation, two people are required to cooperate. One person first connects one side of a cable core to the small busbar. into the small bus terminal. Because the small busbars are charged during temporary cable lapping and removal operations, and the distance between the small busbars and the access terminals and between adjacent small busbars is relatively close, a little carelessness will cause AC and DC short circuits and grounding, resulting in secondary protection PT disconnection or DC power loss of the protection device will bring great safety risks to the power grid and equipment operation. Moreover, this work requires continuous operation at a high place, which takes a long time, and the personnel are prone to fatigue, which also brings risks to the safety of the site. Therefore, the existing operating method of lapping and removing temporary cables on the small busbar at the top of the protective screen has the characteristics of time-consuming, laborious and dangerous, and it is necessary to improve.

【Content of invention】

The problem to be solved by the present invention is to provide a screen-top small busbar jumper connection cable, which has the characteristics of convenient use and high safety.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A screen-top small bus bar jumper connection cable, including four wires, the two ends of the wires are respectively connected with conductive small bus clips, and one of the small bus clips connected to the two ends of the wires is provided with a test wire A voltage indicating mechanism for the voltage difference between the two ends.

The screen-top small bus bar jumper connection cable of the present invention includes four wires, the two ends of the wires are respectively connected with conductive small bus clips, and one of the small bus clips connected to the two ends of the wires is provided with a voltage indicating mechanism, and the voltage indicating mechanism It is used to test the voltage difference between the two ends of the wire, that is, the voltage difference between the wire to be connected and the small busbar to be connected. When the small busbar on the top of the protective screen is lapped, one side first uses the small busbar clamp without a voltage indicating mechanism. Clamp the small busbar on this side, and use the voltage indicating mechanism on the other side to verify the phase is correct, and then clamp the small busbar on the other side to complete the overlapping of the small busbars of this phase. Compared with the prior art, the screen-top small busbar jumper connection cable in the present invention has the following advantages: 1. It saves the need to lay temporary cables and the temporary cables need to be connected to the screen when replacing the protective screen and lapping the small busbars. The operation process of the top small busbar terminal block greatly improves the on-site work efficiency; 2. Install the voltage indicating mechanism on the small busbar clamp, and directly use the small busbar clamp for phase verification, without the need for a voltmeter for each phase lap The core phase basically eliminates the abnormal situation of the busbar power failure caused by the lap connection error, and the operation safety is improved. 3. It can be used repeatedly, saving the cost of temporary cables.

The first specific embodiment: the voltage indicating mechanism is arranged on the small bus clamp at the same end of the four wires. Such a design unifies the work content of the operators and avoids errors during cross-operation.

The second specific embodiment: the small bus clip includes two conductive clips, the clips include a gripping part and a clamping part, the rear ends of the two clips are fixedly connected and connected to the end of the wire Conducting electricity, the two clamping parts form a jaw, and a spring for opening and closing the jaw is arranged between the two gripping parts. So designed, the structure is simple.

Third specific embodiment: the rear end of the clip is connected to the end of the wire by a fixing bolt. It is convenient for later installation and disassembly.

Fourth specific embodiment: the voltage indicating mechanism is arranged outside the front end of the clip. Such design is convenient for the voltage indication mechanism to measure the voltage difference between the small busbar to be connected and the conductor.

The fifth specific embodiment: the voltage indicating mechanism includes a test head and a printed circuit board connected to each other, the printed circuit board is welded on the outside of the front end of the clip, the printed circuit board includes a current limiting resistor and a light-emitting display module, the The light-emitting display module is provided with two indicator lights. In this design, when the voltage difference between the two ends of the wire is zero, the two indicator lights are dark; when the DC voltage difference is generated between the two ends of the wire, one indicator light is on, and when the AC voltage difference is generated between the two ends of the wire, the two indicator lights are on.

Sixth specific embodiment: the clip is a copper clip. Conductive effect is better.

Embodiment 7: The four wires are yellow wires, green wires, red wires and black wires respectively. It is convenient to distinguish A, B, C, and N phases of the voltage loop to avoid wrong connection.

The eighth specific embodiment: the outer side of the small bus clamp is provided with a soft insulating protective cover. With such a design, the operator can press the insulating protective cover to press the spring to open the clamp and clamp the small busbar, so as to avoid the risk of electric shock and has high safety.

Ninth specific embodiment: the small bus bar clamp connected to the two ends of the wire is provided with a red insulating protective cover on one outer side of the voltage indicating mechanism, and a black insulating protective cover on the other outer side. This design is convenient for the staff to distinguish whether the small bus clamp has a voltage indicating mechanism.

These characteristics and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings.

【Description of drawings】

Below in conjunction with accompanying drawing, the present invention will be further described:

Fig. 1 is the structural representation of the screen-top small bus jumper connection cable in the preferred embodiment of the present invention;

Fig. 2 is the structural representation of lead in the preferred embodiment of the present invention;

Fig. 3 is a schematic structural view of a small bus clip with a voltage indicating mechanism in a preferred embodiment of the present invention;

Fig. 4 is a top view of the voltage indicating mechanism in the preferred embodiment of the present invention;

Fig. 5 is the circuit diagram of the voltage indicating mechanism in the preferred embodiment of the present invention;

Fig. 6 is a schematic diagram of the connection state of the wire and the small busbar in the preferred embodiment of the present invention.

【detailed description】

The technical solutions of the embodiments of the present invention will be explained and described below in conjunction with the accompanying drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, not all of them. Based on the examples in the implementation manners, other examples obtained by those skilled in the art without making creative efforts all belong to the protection scope of the present invention.

As shown in Figures 1 to 2, in the preferred embodiment of the present invention, the screen-top small busbar jumper connection cable includes four wires 11, the wires 11 are copper wires, and the cross-sectional area is 4mm ² , due to the existence of AC voltage A, B , C, and N four phase voltages, in order to facilitate the distinction and prevent the wires 11 from being connected incorrectly, the four wires 11 are respectively yellow wires, green wires, red wires and black wires, that is, the outer sides of the four wires 11 are respectively wrapped with yellow insulation layer, a green insulating layer, a red insulating layer and a black insulating layer, four wires 11 are wrapped in the large insulating layer 1, and the two ends of the wires 11 are respectively connected with conductive small busbar clips, and the small busbar clips include two conductive clips The clip 20, the clip 20 can be an iron, silver or copper clip, in order to ensure a good conductive effect and reduce production costs, the clip 20 of the present invention adopts a copper clip, and the clip 20 includes a gripping portion 21 And the clamping part 22, one end of the clip 20 connected to the wire 11 is the rear end, and the other end is the front end, the rear ends of the two clips 20 are fixedly connected, and are connected to the ends of the wire 11 to conduct electricity, in order to facilitate subsequent disassembly and Installation, the rear end of the clip 20 in the present invention is connected with the wire 11 by a fixing bolt 4, a spring 23 is arranged between the two holding parts 21, the spring 23 is a steel spring, and the two clamping parts 22 form a jaw 24. Press the two holding parts 21 to compress the spring 23 to open the clamping mouth 24. When the pressure of pressing the holding parts 21 disappears, the spring 23 resets and closes the clamping opening 24. One of the two small busbar clamps is still A voltage indicating mechanism 3 is provided, and the voltage indicating mechanism 3 is used to detect the voltage difference between the two ends of the wire 11 . The small bus clamp of the invention has the characteristics of simple structure and convenient operation.

Since the small busbar clamp is conductive, in order to prevent the staff from getting an electric shock when using the small busbar clamp, a soft insulating protective cover, such as a silicone protective cover or a rubber protective cover, is provided on the outside of the small busbar clamp, which is convenient for the staff to press , in order to facilitate the staff to quickly distinguish whether the small bus clamp is equipped with a voltage indicating mechanism 3, the present invention sets a red soft insulating protective cover 5 on the outside of the small bus clamp with a voltage indicating mechanism 3, and does not set a voltage indicating mechanism 3 A black soft insulating protective cover 6 is set on the outside of the small bus clamp, and a small bus clamp with a voltage indicating mechanism 3 is connected to the same end of the wire 11, which is convenient for unifying the work content of the staff and avoiding crossing between two staff. Errors are generated while working, and the appearance is more beautiful.

As shown in Figures 3 to 6, in order to facilitate the voltage indicating mechanism 3 to measure the voltage difference between the small busbar 7 and the conductor 11 to be connected, the voltage indicating mechanism 3 of the present invention is arranged outside the front end of the clip 20, and the voltage indicating mechanism 3 Including a test head 31 and a printed circuit board 32, the test head 31 is connected to the printed circuit board 32, the printed circuit board 32 is connected to the outside of the front end of the clip 20 through a welding point 33, that is, on the clamping part 22, and the printed circuit board 32 is provided with The current-limiting resistor R1 and the light-emitting display module are provided with two indicator lights 320, and the two indicator lights 320 are provided with AC and DC general-purpose light-emitting diodes D1 and D2, and the dark and bright states of the two indicator lights 320 are used Whether a voltage difference is generated at both ends of the indicator wire 11 and whether the generated voltage difference is an AC voltage difference or a DC voltage difference.

When using on-site, the small bus bar clamp without voltage indicating mechanism 3 is first clamped on the small bus bar 7 on one side, the voltage on this side is transmitted to the opposite side circuit terminal through the wire 11, and the test head 31 on the opposite side is contacted with the small bus bar to be connected. The bus bar 7 and the printed circuit board 32 can display whether there is a voltage difference between the two ends of the wire 11, that is, whether there is a voltage difference between one end of the wire 11 to be connected and the other end. The specific detection method is as follows: the A end is a welding point 33, The B end is the test head 31. When there is no voltage difference between the test head 31 and the welding point 33, the light-emitting diodes D1 and D2 are all off, and the two indicator lights 320 are off; When the DC voltage is applied, one of the light emitting diodes D1 and D2 is lit, that is, one indicator light 320 is on; when an alternating voltage is generated between the test head 31 and the welding point 33, the light emitting diodes D1 and D2 are lighted simultaneously, and the two Indicator light 320 is on. When the small busbar clamp in the present invention clamps the small busbar 7, the contact resistance is less than 10mΩ, and after connecting four copper wires ¹¹ of 4mm2, a current of 20A is passed through, and the stable temperature rise is less than 30K, which is in line with Table 2 of GB14048.1-2012, Table 2 9 The temperature rise of copper terminals is less than the standard requirement of 65K. Voltage difference indication circuit indicators: DC voltage difference ≥ 15V, a single indicator light 320 is on, and AC voltage ≥ 47V, two indicator lights 320 are on. It meets the field application requirements of the secondary system of the substation. Of course, in other embodiments of the present invention, the cable may also include multiple wires, which will not be described here.

When the protective screen is replaced, the lapping steps of using the screen top small busbar jumper connection cable of the present invention are as follows: (1) the staff on one side use the small busbar clamp without the voltage indicating mechanism 3 to clamp the small busbar clamp on the side first. The busbar 7, the voltage on this side is transmitted to the opposite side circuit terminal through the wire 11, that is, the welding point 33; (2) the staff on the opposite side touches the test head 31 on the small busbar clamp to the small busbar 7 on the opposite side, and the light-emitting diodes D1 and D2 It can display whether there is a voltage difference on both sides. When the voltage difference on both sides is zero, the two indicator lights 320 are not on, and the small bus bar 7 on the opposite side can be clamped immediately with the small bus bar clamp; when there is a voltage difference on both sides, the indicator The light 320 is on, and the small busbar 7 of this side cannot be clamped, otherwise a short circuit will be caused; (3) repeat the above operation to complete the temporary cable bonding of all the small busbars. Using the screen-top small busbar jumper connection cable of the present invention to overlap the screen-top small busbar 7 has the following advantages: 1. It saves the need to lay temporary cables and temporary cables to be connected to the screen when replacing the protective screen to overlap the small busbar 7 The operation process of the top small bus bar terminal block reduces the working intensity of the staff and increases the working efficiency by 3 times; 2. Install the voltage indicating mechanism 3 on the small bus bar clamp, and directly use the small bus bar clamp for phase verification without A voltmeter is required to verify the phases of each overlapping connection, which basically eliminates the abnormal situation of the busbar power failure caused by the overlapping connection error, and improves the operation safety. 3. It can be used repeatedly, saving the cost of temporary cables.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and those skilled in the art should understand that the present invention includes but is not limited to the accompanying drawings and the description in the above specific embodiments content. Any modifications that do not depart from the functional and structural principles of the present invention will be included in the scope of the claims.

Claims (10)

1. the little bus bar bridging connecting cable in screen top, it is characterized in that: comprise four wires, the two ends of described wire are connected to the small bus-bar clamp of conduction, the small bus-bar clamp that described wire two ends connect one of them be provided with voltage indicating mechanism for test lead both end voltage difference.

2. the little bus bar bridging connecting cable in screen top according to claim 1, is characterized in that: described voltage indicating mechanism is arranged on four wires with on the small bus-bar clamp of one end.

3. the little bus bar bridging connecting cable in screen top according to claim 1, it is characterized in that: described small bus-bar clamp comprises the intermediate plate of two conductions, described intermediate plate comprises grip part and clamping section, the rear end of described two intermediate plates is fixedly connected with, and be connected with wire termination and conduct electricity, two clamping sections form jaws, are provided with the spring for jaws described in opening and closing between two grip parts.

4. the little bus bar bridging connecting cable in screen top according to claim 3, is characterized in that: the rear end of described intermediate plate is connected by set bolt with wire termination.

5. the little bus bar bridging connecting cable in screen top according to claim 3, is characterized in that: described voltage indicating mechanism is arranged on the front end outer side of intermediate plate.

6. the little bus bar bridging connecting cable in screen top according to claim 5, it is characterized in that: described voltage indicating mechanism comprises interconnective measuring head and printed circuit board (PCB), described printed circuit board (PCB) is welded on the front end outer side of intermediate plate, described printed circuit board (PCB) comprises current-limiting resistance and light emitting display module, and described light emitting display module is provided with two indicator lights.

7. push up little bus bar bridging connecting cable according to the screen one of claim 3 to 6 Suo Shu, it is characterized in that: described intermediate plate is copper intermediate plate.

8. push up little bus bar bridging connecting cable according to the screen one of claim 1 to 6 Suo Shu, it is characterized in that: described four wires are respectively yellow wire, green wire, red wire and black wire.

9. push up little bus bar bridging connecting cable according to the screen one of claim 1 to 6 Suo Shu, it is characterized in that: outside described small bus-bar clamp, be provided with soft insulation protective jacket.

10. the little bus bar bridging connecting cable in screen top according to claim 9; it is characterized in that: the outside being provided with voltage indicating mechanism in the small bus-bar clamp that described wire two ends connect is provided with red insulation protective jacket, is provided with black insulation protective jacket outside another.