CN109787194B - Method for realizing closing and locking after capacitor protection tripping - Google Patents

Abstract

The invention discloses a method for realizing closing and locking after capacitor protection trips, comprising the following steps: selecting a protection device, installing the protection device, configuring a reset button, and after encountering a fault protection action switch tripping, the closing holding relay HBJ is in conduction In the on state, after the coil is energized and transmitted to the iron core to absorb electricity, a magnetic force is generated, the spring opens, and the iron hook drives the traction rod to move at the same time. operation, and the circuit is in a self-holding state, and the electrical closing operation can never be performed without external manual reset. After the detection is completed, after the button is pressed, the iron hook moves down and the drawbar is engaged with each other, and the whole is in the reset state. , the closing coil HQ is in conduction, leading to the completion of the closing of the capacitor, which can ensure that the electrical closing circuit is always in a disconnected state before the reset button is pressed on site, which can effectively prevent the capacitor from being put into operation without inspection and testing after tripping.

Description

A method for realizing closing and blocking after capacitor protection trips

technical field

The invention relates to a method for capacitor protection tripping, in particular to a method for realizing closing and blocking after capacitor protection tripping.

Background technique

The capacitor bank in operation, after encountering the tripping of the fault protection action switch, cannot easily test the capacitor bank. It is necessary to transfer the capacitor bank to the maintenance state, and then test the capacitor switch and put the capacitor bank into operation. In actual operation, after the capacitor protection trips, the capacitor bank will be put into operation again without inspection and test due to poor communication between personnel or the closing command sent by the reactive power optimization system on the dispatcher side, which will bring about the safe and stable operation of the power grid and equipment. Due to uncertain factors, there are great security risks.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a method for realizing closing and locking after capacitor protection tripping, which has the advantages of effectively preventing capacitors from being put into operation without inspection and testing after tripping due to faults and ensuring safety, so as to solve the problems raised in the above background technology.

In order to achieve the above purpose, the present invention provides the following technical solutions: a method for realizing closing and blocking after capacitor protection trips, comprising the following steps:

S1: Select the protection device. The normally closed contact of the protection action in the protection device is in a closed state when the protection capacitor is in normal operation, which will not affect the flow of its current. After the protection action is in an open state, it still has the function of self-holding That is, the contact must be manually reset to return to the closed state after it is activated;

S2: Install the protection device, connect the normally closed contact of the protection action opened by the protection device to the electrical closing circuit of the capacitor, and find a suitable space between the reclosing and closing coil of the capacitor to connect in series, and the protection is closed during normal operation. The switch is turned on, and the switch can be electrically closed. After the protection action, the closing circuit is disconnected, and the switch cannot be electrically closed, and the circuit is in a self-holding state, which cannot be performed without external manual reset. Electrical closing operation;

S3: Configure a reset button. When the on-site inspection and test are correct, you need to manually operate the button connected to the normally closed contact of the protection action to unlock the capacitor to realize the closing operation of the capacitor. After manually pressing the reset button, the normally closed contact of the protection action When it is closed and conducted, the closing circuit is re-conducted, and the capacitor switch can be electrically closed at this time.

Further, the protection device is composed of a lock assembly and a traction rod connected to the capacitor. The lock assembly includes a coil, a lock frame and an iron core. The coil is placed inside the lock frame, the iron core is installed on the side of the lock frame, and the top of the iron core is installed. An iron hook that rotates around the lock frame is installed on the surface, and a spring is connected to the side of the iron hook.

Further, the coil and the wire connected to the recloser are energized, the drawbar is connected to the closing holding coil HBJ, the trip holding coil TBJ and the parallel terminal of the anti-jump relay TBJV, the iron hook and the drawbar are in a conducting state after contacting, The hook and the drawbar separate after the protective action.

Further, the top end of the iron hook is connected to the button, and after the button is pressed, the iron hook 3 is moved down and engaged with the iron hook.

Compared with the prior art, the beneficial effects of the present invention are:

The method of realizing closing and locking after the capacitor protection trips, after encountering the tripping of the fault protection action switch, the closing and keeping relay HBJ is in the conducting state, and the coil is energized and transmitted to the iron core to absorb electricity, and a magnetic force is generated, the spring is opened, The iron hook drives the drawbar to move at the same time, and the closing circuit of the tripping switch is disconnected after the protection action. The switch cannot be electrically closed, and the circuit is in a self-holding state, and electrical closing cannot be performed without external manual reset. Switching operation, after the detection is completed, after the button is pressed, the iron hook moves down and the drawbar is engaged with each other, the whole is in the reset state, the closing coil HQ is turned on, causing the capacitor to complete closing, which can ensure that the reset is pressed on site. Before the button is pressed, the electrical closing circuit is always in a disconnected state, which can effectively prevent the capacitor from being put into operation without inspection and test after the fault tripping.

Description of drawings

Fig. 1 is the existing closing circuit diagram of the present invention;

Fig. 2 is the closed state diagram of the protection action of the closing circuit diagram of the present invention;

Fig. 3 is the closed circuit diagram protection action disconnection state diagram of the present invention;

FIG. 4 is a structural diagram of the protection device of the present invention.

In the figure: 1, lock assembly; 11, coil; 12, lock frame; 13, iron core; 2, drawbar; 3, iron hook; 31, spring.

Detailed ways

The technical solutions in the embodiments of the present invention will be clarified below with reference to the accompanying drawings in the embodiments of the present invention; a complete description will be made. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The embodiments of the present invention, and all other embodiments obtained by those of ordinary skill in the art without creative work, fall within the protection scope of the present invention.

Please refer to Figure 1, the existing capacitor bank, after encountering the tripping of the fault protection action switch, the capacitor bank cannot be easily tested. It is necessary to transfer the capacitor bank to the maintenance state. Put into operation, after the capacitor protection trips, after completing the opening, the reclosing closes the circuit breaker in a short time, the remote closing using the trip circuit is in the closed state, the closing holding relay HBJ and the anti-jumping relay TBJV are closed, and the closing coil is closed. HQ is in conduction, which causes the capacitor to complete closing, resulting in the operation accident of the switch being closed by mistake.

Please refer to Figure 2-3, a method for realizing closing and blocking after capacitor protection trips, including the following steps:

Step 1: Select a protection device. The normally closed contact of the protection action in the protection device is in a closed state during the normal operation of the protection capacitor, which will not affect the flow of its current. After the protection action, it is in an open state and still has a self-holding function , that is, the contact must be manually reset before returning to the closed state;

Step 2: Install the protection device, connect the normally closed contact of the protection action opened by the protection device to the electrical closing circuit of the capacitor, and find a suitable space between the reclosing and closing coil of the capacitor in series to protect the normal operation. The closing circuit is turned on, and the switch can be electrically closed. After the protection action, the closing circuit is disconnected, and the switch cannot be electrically closed, and the circuit is in a self-holding state, which cannot be done without external manual reset. Carry out electrical closing operation;

Step 3: Configure a reset button. When the on-site inspection and test are correct, it is necessary to manually operate the button connected to the normally closed contact of the protection action to unlock the capacitor to realize the closing operation of the capacitor. After manually pressing the reset button, the protection action is normally closed. The contact is closed and turned on, and the closing circuit is turned on again. At this time, the capacitor switch can be electrically closed.

A normally closed auxiliary contact is connected in series at the neutral point between the recloser and the closing coil, and the purpose of closing can be achieved only by operation.

Please refer to FIG. 4 , the protection device is composed of a lock assembly 1 and a traction rod 2 connected to the capacitor. The lock assembly 1 includes a coil 11, a lock frame 12 and an iron core 13. The coil 11 is placed inside the lock frame 12. The coil 11 and The wires connected to the recloser are energized, and the drawbar 2 is connected to the closing holding coil HBJ, the trip holding coil TBJ and the parallel terminal of the anti-jump relay TBJV. After the action, the iron hook 3 and the drawbar 2 are separated, the iron core 13 is installed on the side of the lock frame 12, the iron hook 3 that rotates around the lock frame 12 is installed on the top surface of the iron core 13, and the side of the iron hook 3 is connected with a spring 31 , the iron hook 3 is connected to the lock frame 12 through the spring 31, the iron hook 3 and the port of the drawbar 2 are engaged with each other, the top of the iron hook 3 is connected to the button, and the button is pressed to drive the iron hook 3 to move down, And engage with the iron hook 3.

After the fault protection action switch trips, the closing relay is in the conducting state, the coil 11 is energized and transmitted to the iron core 13 to absorb electricity, and a magnetic force is generated, the spring 31 opens, and the iron hook 3 drives the drawbar 2 to move at the same time, and the release After the protection action, the closing circuit is disconnected, and the switch cannot be electrically closed, and the circuit is in a self-holding state, and the electrical closing operation cannot be performed without external manual reset. After the detection is completed, press the button. After going down, the iron hook 3 moves down and the traction rod 2 is engaged with each other, and the whole is in a reset state, and the closing coil HQ is in conduction, resulting in the completion of the closing of the capacitor.

To sum up, the method of realizing closing and locking after the capacitor protection trips, after encountering the tripping of the fault protection action switch, the closing holding relay HBJ is in the conducting state, and the coil 11 is energized and transmitted to the iron core 13 after the power is absorbed, resulting in The magnetic force is applied, the spring 31 opens, the iron hook 3 drives the drawbar 2 to move at the same time, the tripping and opening circuit is disconnected after the protection action, and the switch cannot be electrically closed, and the circuit is in a self-holding state, without In the case of external manual reset, the electrical closing operation cannot be performed. After the detection is completed, after the button is pressed, the iron hook 3 moves down and the drawbar 2 is engaged with each other, and the whole is in the reset state, and the closing coil HQ is turned on. The closing of the capacitor can ensure that the electrical closing circuit is always in a disconnected state before the reset button is pressed on the spot, which can effectively prevent the capacitor from being put into operation without inspection and test after tripping due to fault.

The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. The equivalent replacement or change of the inventive concept thereof shall be included within the protection scope of the present invention.

Claims (3)

1. a method for realizing closing and blocking after a capacitor protection tripping, is characterized in that, comprises the following steps: S1: Select the protection device. The normally closed contact of the protection action in the protection device is in a closed state when the protection capacitor is in normal operation, which will not affect the flow of its current. After the protection action is in an open state, it still has the function of self-holding That is, the contact must be manually reset to return to the closed state after it is activated; S2: Install the protection device, connect the normally closed contact of the protection action opened by the protection device to the electrical closing circuit of the capacitor, and find a suitable space between the reclosing and closing coil of the capacitor to connect in series, and the protection is closed during normal operation. The switch is turned on, and the switch can be electrically closed. After the protection action, the closing circuit is disconnected, and the switch cannot be electrically closed, and the circuit is in a self-holding state, which cannot be performed without external manual reset. Electrical closing operation; S3: Configure a reset button. When the on-site inspection and test are correct, it is necessary to manually operate the button connected to the normally closed contact of the protection action to unlock the capacitor to realize the closing operation of the capacitor. After manually pressing the reset button, the normally closed contact of the protection action The closing circuit is turned on, the closing circuit is turned on again, and the capacitor switch can be electrically closed at this time; The protection device consists of a lock assembly (1) and a traction rod (2) connected to the capacitor. The lock assembly (1) includes a coil (11), a lock frame (12) and an iron core (13), and the coil (11) is placed on the Inside the lock frame (12), the iron core (13) is installed on the side of the lock frame (12), and the iron hook (3) that rotates around the lock frame (12) is installed on the top surface of the iron core (13). A spring (31) is connected to the side of (3), the iron hook (3) is connected to the lock frame (12) through the spring (31), and the iron hook (3) and the port of the drawbar (2) are engaged with each other. 2. A method for realizing closing and locking after capacitor protection tripping according to claim 1, characterized in that: the coil (11) is connected to the wire connected to the reclosing, and the traction rod (2) is connected to the closing holding coil. The parallel terminals of HBJ, trip holding coil TBJ and anti-jump relay TBJV are connected to each other. The iron hook (3) and the drawbar (2) are in a conducting state after contacting. After the protection action, the iron hook (3) and the drawbar (2) are in a conducting state. separation. 3. A method for realizing closing and locking after a capacitor protection tripping according to claim 1, characterized in that: the top of the iron hook (3) is connected to the button, and the button is pressed to drive the iron hook (3) to move down , and engage with the iron hook (3).

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