CN107564746A - A kind of electronic earthing knife-switch interlock of Medium Voltage Switchgear and its method of work - Google Patents

Abstract

The invention relates to an electric ground knife interlocking device of a medium-voltage switchgear and its working method. The device is arranged on the switch cabinet and includes an electric ground knife controller and an interlocking circuit. switch, crank arm travel switch, circuit breaker handcart test position auxiliary switch, circuit breaker handcart opening position auxiliary switch and electrified indicator locking node switch, there is a movable The grounding switch baffle slides up and down. The grounding switch baffle is provided with a handle, which passes through the ground knife operation hole. The bottom of the grounding switch baffle forms a trigger part. The vertical plane of the trigger part is provided with a card slot. The contacts of the type travel switch snap into the slot. Compared with the prior art, the present invention ensures the safety of the closing and opening operation of the electric floor knife while satisfying the convenience of operation of the electric floor knife, and reduces the probability of accidents caused by the intelligent operation of the electric floor knife.

Description

A medium-voltage switchgear electric ground knife interlocking device and its working method

technical field

The invention relates to the technical field of electrical switches, in particular to an electric floor knife interlocking device for a medium-voltage switch cabinet and a working method thereof.

Background technique

With the development of the national grid and the improvement of domestic research switchgear technology, the electric ground knife of the switchgear has begun to be applied in the grid system station. The operation safety of the electric ground knife in the switch cabinet has become a problem that needs to be paid attention to and solved at present. If the electric floor knife is not interlocked, once the back door of the switch cabinet is opened, the switch cabinet is electrified or the handcart of the circuit breaker of the switch cabinet is not in the test opening position, other people operating the floor knife in front of the cabinet or by remote control will cause great safety hazards . If it cannot be discovered in time, it will not meet the requirements of the five-proof interlock of the switch cabinet, and it will easily lead to accidents of injury and electric shock.

Contents of the invention

The object of the present invention is to provide a medium-voltage switchgear electric floor knife interlocking device and its working method in order to overcome the above-mentioned defects in the prior art, which ensures that the electric floor knife is closed while satisfying the convenience of operation of the electric floor knife. The safety of the opening operation reduces the probability of accidents caused by the intelligent operation of the electric ground knife.

The purpose of the present invention can be achieved through the following technical solutions:

An electric ground knife interlocking device of a medium-voltage switchgear, which is set on the switch cabinet, and includes an electric ground knife controller and an interlock circuit, the interlock signal end of the electric ground knife controller is connected to one end of the interlock circuit, and the The other end of the interlocking circuit is grounded, and the interlocking circuit includes a series-connected rear door click-type travel switch, a crank-arm travel switch, an auxiliary switch for the test position of the circuit breaker handcart, an auxiliary switch for the opening position of the circuit breaker handcart and a live display lock Node switch, between the ground knife operation hole of the switch cabinet and the electric ground knife shaft, there is a grounding switch baffle that can slide up and down. The middle part of the grounding switch baffle is provided with a horizontally outwardly bent handle. part through the ground knife operation hole, the bottom of the grounding switch baffle is bent horizontally inward and then vertically downward to form a trigger part, the vertical plane of the trigger part is provided with a card slot, and the crank arm The trip switch is located below the rotating shaft of the electric floor knife, and the contact of the arm type travel switch is inserted into the card slot. The plate blocks the ground knife operation hole, the contact of the crank arm travel switch moves with the grounding switch baffle to close the crank arm travel switch, and the rear door hit travel switch, circuit breaker handcart test position auxiliary switch, circuit breaker hand The auxiliary switch of the vehicle opening position and the locking node switch of the electrified indicator are closed at the same time.

The vertical edge of the grounding switch baffle is provided with a limiting plate extending inward, the limiting plate is perpendicular to the grounding switch baffle, and the limiting plate is provided with a U-shaped limiting groove with an upward opening. When the ground switch baffle plate blocks the ground knife operating hole, the cam limit on the electric ground knife rotating shaft rotates in the U-shaped limit groove.

The switch cabinet is provided with an auxiliary locking assembly, and the auxiliary locking assembly includes a rotating seat, a rotating pin and a locking bar. One end of the handle is hinged with the rotating seat through a rotating pin, and the other end of the locking bar is provided with a locking hole. When the grounding switch baffle blocks the ground knife operating hole, the locking bar rotates so that the handle passes through the locking hole and is limited in the locking hole.

The handle part is provided with a lock hole.

The crank arm type travel switch is arranged below the rotating shaft of the electric ground knife through the travel switch mounting plate.

A working method of the above-mentioned electric ground knife interlocking device of a medium voltage switchgear, comprising the following steps:

When the electric ground knife controller operates the ground knife on the spot, use the handle part to press down the grounding switch baffle to expose the ground knife operation hole, and the handle is inserted into the ground knife operation hole to control the rotation of the electric ground knife shaft;

When the electric ground knife controller remotely operates the ground knife, take off the handle, and use the handle to lift the grounding switch baffle so that the grounding switch baffle blocks the floor knife operation hole, and the contact of the crank arm travel switch moves with the movement of the grounding switch baffle. Make the crank arm travel switch closed, and the rear door hit travel switch, the circuit breaker handcart test position auxiliary switch, the circuit breaker handcart opening position auxiliary switch and the live display lock node switch are closed at the same time, at this time the electric floor knife controller The interlock signal at the interlock signal end is valid.

Compared with the prior art, the present invention has the following advantages:

1. By setting the crank arm type travel switch, combined with the back door hit type travel switch, the circuit breaker handcart test position auxiliary switch, the circuit breaker handcart opening position auxiliary switch and the live display lock node switch, the operation of the electric floor knife is satisfied. In the case of convenience, the safety of the electric ground knife closing and opening operation is ensured, and the probability of accidents caused by the intelligent operation of the electric ground knife is reduced.

2. Before preparing the electric floor knife controller to remotely operate the ground knife, use the handle to lift the grounding switch baffle so that the grounding switch baffle blocks the floor knife operation hole, and then the ground knife can be remotely controlled to close/disengage the ground knife, effectively avoiding forgetting to pull it out When the handle is pulled out, the handle rebounds and accidentally injures people during remote control.

3. The baffle plate of the grounding switch is provided with a limit plate with a U-shaped limit groove. The cam limit on the electric floor knife rotating shaft rotates in the U-shaped limit groove, which can further ensure that the electric floor knife shaft does not rotate when remote control. It will be offset, and the work stability is better.

4. Set up auxiliary locking components to further fix the position of the handle and improve the safety of the equipment.

5. Easy installation, little change to the original structure, low production cost, and easy popularization and application.

Description of drawings

Figure 1 is the secondary principle diagram of the electric ground knife circuit interlock;

Figure 2 is the secondary principle diagram of the electric floor knife circuit interlocking device of the medium voltage switchgear electric floor knife interlocking device with a crank arm type travel switch;

Fig. 3 is a schematic diagram of the right side of the crank arm travel switch and the grounding switch baffle in the electric ground knife interlocking device of the medium voltage switchgear;

Fig. 4 is a schematic diagram on the left side of the crank arm travel switch and the grounding switch baffle in the electric ground knife interlocking device of the medium voltage switchgear;

Figure 5 is a schematic diagram of the structure of the grounding switch baffle in the electric floor knife interlocking device of the medium voltage switchgear;

Fig. 6 is a structural schematic diagram of the auxiliary locking component in the electric ground knife interlocking device of the medium voltage switchgear.

In the figure, JC is the electric floor knife controller, JZ is the electric floor knife auxiliary switch, LX1 is the point impact travel switch, LX2 is the crank arm travel switch, S8 is the circuit breaker handcart test position auxiliary switch, DL is the circuit breaker Auxiliary switch for opening position of the handcart, K1 is the locking node switch of the live display, DK1 is the air switch, 1QK is the remote local transfer switch, and DXN is the live display device;

101 is the switch cabinet, 102 is the ground knife operation hole, 103 is the electric ground knife shaft, 104 is the grounding switch baffle, 105 is the handle part, 106 is the trigger part, 107 is the card slot, 108 is the contact, 109 is the limit Plate, 110 is a U-shaped limit groove, 111 is a cam, 112 is a rotating seat, 113 is a rotating pin, 114 is a locking bar, 115 is a locking hole, 116 is a locking hole, 117 is a travel switch mounting plate, and 118 is a remote control device , 119 is the background host computer.

detailed description

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

The working principle of the electric ground knife interlock circuit:

The electric ground knife interlocks the operation of the electric ground knife through the controller of the electric ground knife. When the back door of the switch cabinet 101 is closed, the circuit breaker handcart is in the test position and the opening position, and the primary busbar is not charged, the electric ground knife can be operated. ground knife.

The specific implementation is achieved by installing a point-impact travel switch LX1 on the back door of the switch cabinet 101. When the rear door is closed, the point-impact travel switch LX1 changes from the original normally open point to the normally closed point; then the handcart is shaken out to the test position, The circuit breaker handcart test position auxiliary switch S8 is closed and the circuit breaker handcart opening position auxiliary switch DL is closed, and the circuit breaker handcart is in the opening state; the locking node switch K1 is used to lock the live display. When the normally open point of the display lock node switch K1 changes to the normally closed point, the interlock signal is valid, and the electric ground knife can be operated remotely to perform operations such as closing and opening.

The secondary schematic diagram of the electric ground knife circuit interlock is shown in Figure 1. If only the above-mentioned interlocking is achieved, the safety of operating the electric floor knife can be basically guaranteed, but a phenomenon is ignored. When the on-site maintenance personnel operate the floor knife on the spot, the handle is inserted into the floor knife operation hole 102 and forgets to pull it out. When the ground knife is operated by remote control in the background, the handle rotates with the electric ground knife rotating shaft 103 so that it loses control and bounces out and easily injures people.

Therefore, in this case, the present invention proposes a medium-voltage switchgear electric floor knife interlocking device that uses the arm-type travel switch LX2 to be installed at the floor knife operation hole 102 to participate in the interlocking of the electric floor knife, as shown in Figure 2 - As shown in Figure 5, the electric ground knife interlocking device of the medium voltage switchgear is set on the switch cabinet 101, including the electric ground knife controller JC and an interlock circuit, and the interlock signal terminal of the electric ground knife controller JC is connected to the interlock One end of the circuit, the other end of the interlocking circuit is grounded, and the interlocking circuit includes the rear door hit type travel switch LX1 connected in series, the arm type travel switch LX2, the circuit breaker handcart test position auxiliary switch S8, and the circuit breaker handcart opening switch. Auxiliary position switch DL and live display lock node switch K1, grounding switch bezel 104 that can slide up and down is provided between ground knife operation hole 102 of switch cabinet 101 and electric ground knife rotating shaft 103, and the middle part of grounding switch bezel 104 is provided with The handle part 105 bent horizontally outwards, the handle part 105 passes through the ground knife operation hole 102, the bottom of the grounding switch baffle plate 104 is bent horizontally inwards and then bent vertically downwards to form a trigger part 106, the trigger part 106 There is a card slot 107 on the vertical plane, and the lever arm type travel switch LX2 is set under the electric ground knife rotating shaft 103 through the travel switch mounting plate 117, which is convenient to install and has little change to the original structure. The head 108 is snapped into the card slot 107. Before preparing the electric floor knife controller JC to remotely operate the ground knife, use the handle part 105 to lift the ground switch baffle 104 so that the ground switch baffle 104 blocks the ground knife operation hole 102, and the arm stroke The contact 108 of the switch LX2 moves with the grounding switch baffle plate 104 to close the crank arm type travel switch LX2, and the back door hit type travel switch LX1, the circuit breaker handcart test position auxiliary switch S8, and the circuit breaker handcart opening position auxiliary switch The switch DL and the live display lock node switch K1 are closed at the same time, and only then can the remote control close/disengage the ground knife, which can effectively avoid the situation that the handle rebounds and accidentally injures people when the remote control is performed due to forgetting to pull out the handle.

The first pin and the second pin of the electric ground knife controller JC in Fig. The pin and the sixth pin are connected to the background host computer 119 for transmitting the fault alarm signal to the background, and the ninth-fifteen pins are the 0V common terminal, the remote local terminal, the interlock signal terminal, and the remote ground knife Remote local switch 1QK is connected between the 0V common terminal, the remote local terminal, the remote control ground closing knife end, the remote ground closing knife end, and the remote ground dividing knife. The ends are connected to the remote control device 118 respectively, and the on-the-spot closing knife end and the on-the-spot splitting knife end are respectively connected to the electric ground knife auxiliary switch JZ.

The vertical side of the grounding switch baffle plate 104 is provided with a limiting plate 109 extending inward, the limiting plate 109 is perpendicular to the grounding switch baffle plate 104, and the limiting plate 109 is provided with a U-shaped limiting groove 110 with an upward opening When the ground switch baffle plate 104 blocks the ground knife operating hole 102, the cam 111 on the electric ground knife rotating shaft 103 is limited to rotate in the U-shaped limit groove 110, which can further ensure that the electric ground knife rotating shaft 103 does not rotate It will be offset, and the work stability is better.

As shown in Figure 6, an auxiliary locking assembly is provided on the switch cabinet 101. The auxiliary locking assembly includes a rotating base 112, a rotating pin 113 and a locking bar 114. 102 one side, one end of locking bar 114 is hinged with rotating seat 112 by rotating pin 113, and the other end of locking bar 114 is provided with locking hole 115, when earthing switch baffle plate 104 blocks ground knife operating hole 102, locking bar 114 rotates to make The handle part 105 passes through the locking hole 115 and is limited in the locking hole 115. The handle part 105 is provided with a locking hole 116, which can be further locked at the locking hole 116 to improve safety.

A working method of the above-mentioned electric ground knife interlocking device of a medium voltage switchgear, comprising the following steps:

When the electric ground knife controller JC operates the ground knife on the spot, use the handle part 105 to press down the grounding switch baffle 104 to expose the ground knife operation hole 102, insert the handle into the ground knife operation hole 102, control the rotation of the electric ground knife rotating shaft 103, and then operate earthing switch;

When the electric ground knife controller JC remotely operates the ground knife, take off the handle, use the handle part 105 to lift the grounding switch baffle 104 so that the grounding switch baffle 104 blocks the floor knife operation hole 102, and the contact 108 of the lever-type travel switch LX2 With the movement of the grounding switch baffle plate 104, the crank arm type travel switch LX2 is closed, and the rear door hit type travel switch LX1, the circuit breaker handcart test position auxiliary switch S8, the circuit breaker handcart opening position auxiliary switch DL and the live display are locked The node switch K1 is closed at the same time, and the interlock signal at the interlock signal terminal of the electric ground knife controller JC is valid at this time. The crank arm travel switch LX2 cooperates with the rear door point impact travel switch LX1, the circuit breaker handcart test position auxiliary switch S8, the circuit breaker handcart opening position auxiliary switch DL and the live indicator locking node switch K1 to achieve live locking and rear door interlocking. Purpose.

Claims (6)

1. An electric ground knife interlocking device for a medium-voltage switchgear, set on the switch cabinet (101), characterized in that it includes an electric ground knife controller (JC) and an interlocking circuit, and the electric ground knife controller ( The interlocking signal end of JC) is connected to one end of the interlocking circuit, and the other end of the interlocking circuit is grounded. The interlocking circuit includes a rear door click-type travel switch (LX1), a crank-arm travel switch (LX2), The circuit breaker handcart test position auxiliary switch (S8), the circuit breaker handcart opening position auxiliary switch (DL) and the live display lock node switch (K1), the ground knife operation hole (102) of the switch cabinet (101) and the electric ground A grounding switch baffle (104) that can slide up and down is provided between the knife shafts (103), and a handle (105) that is bent horizontally outwards is provided in the middle of the grounding switch baffle (104). (105) passes through the ground knife operation hole (102), the bottom of the grounding switch baffle (104) is bent horizontally inward and then vertically downward to form a trigger part (106), the trigger part (106) There is a card slot (107) on the vertical plane of the arm type travel switch (LX2), which is located under the electric ground knife shaft (103), and the contact (108) of the arm type travel switch (LX2) snaps into the In the card slot (107), before preparing the electric ground knife controller (JC) to remotely operate the ground knife, use the handle part (105) to lift the grounding switch baffle (104) so that the grounding switch baffle (104) blocks the floor knife operation hole (102), the contact (108) of the crank arm type travel switch (LX2) moves with the grounding switch baffle (104) to close the crank arm type travel switch (LX2), and the rear door click type travel switch (LX1), The circuit breaker handcart test position auxiliary switch (S8), the circuit breaker handcart opening position auxiliary switch (DL) and the live indicator locking node switch (K1) are closed simultaneously. 2. The electric ground knife interlocking device of a medium-voltage switchgear according to claim 1, wherein a limit plate ( 109), the limit plate (109) is perpendicular to the grounding switch bezel (104), and the limit plate (109) is provided with a U-shaped limit groove (110) with an upward opening, when the grounding switch bezel (104 ) blocks the ground knife operating hole (102), the cam (111) on the electric ground knife rotating shaft (103) is limited to rotate in the U-shaped limit groove (110). 3. The electric ground knife interlocking device for medium-voltage switchgear according to claim 1, characterized in that, the switchgear (101) is provided with an auxiliary locking assembly, and the auxiliary locking assembly includes a rotating seat (112 ), a rotating pin (113) and a locking bar (114), the rotating seat (112) is set on the outer wall of the switch cabinet (101), and is located on the side of the floor knife operation hole (102), and the locking bar (114 ) is hinged with the rotating seat (112) through the rotating pin (113), and the other end of the locking bar (114) is provided with a locking hole (115). , the locking bar (114) is rotated so that the handle part (105) passes through the locking hole (115) and is limited in the locking hole (115). 4. The electric ground knife interlocking device of a medium-voltage switchgear according to claim 3, characterized in that a lock hole (116) is provided on the handle part (105). 5. An interlocking device for electric ground knife of medium voltage switchgear according to claim 1, characterized in that, the crank arm type travel switch (LX2) is set on the rotating shaft of electric ground knife through the travel switch mounting plate (117) (103) below. 6. A working method of the electric ground knife interlocking device of the medium-voltage switchgear as claimed in claim 1, characterized in that it comprises the following steps: When the electric ground knife controller (JC) operates the ground knife on the spot, use the handle part (105) to press down the grounding switch baffle (104) to expose the ground knife operation hole (102), and insert the handle into the ground knife operation hole (102) Control the rotation of the electric ground knife rotating shaft (103); When the electric ground knife controller (JC) remotely operates the ground knife, remove the handle, use the handle part (105) to lift the grounding switch baffle (104) so that the grounding switch baffle (104) blocks the ground knife operation hole (102), The contact (108) of the crank arm travel switch (LX2) moves with the grounding switch baffle (104) to close the crank arm travel switch (LX2), and the rear door click travel switch (LX1), circuit breaker handcart The test position auxiliary switch (S8), the circuit breaker handcart opening position auxiliary switch (DL) and the live indicator lock node switch (K1) are closed at the same time, at this time the interlock signal of the interlock signal terminal of the electric ground knife controller (JC) efficient.