CN209626164U - A kind of safety device for preventing from moving parallel device reverse charge again - Google Patents

Abstract

The utility model discloses a kind of safety devices for preventing from moving parallel device reverse charge again, including transformer, breaker, rectifier and relay, the transformer connection segment bus, the rectifier connects transformer, the control terminal of the relay connects rectifier, the actuating station connection segment bus of the relay and parallel device is moved again, the breaker is series in sectionalized busbar.After the utility model can prevent sectionalized busbar failure, parallel device is moved again and occurs the case where reverse charge, effective protection electric power networks and equipment at work, improves safety and reliability.

Description

A safety device for preventing reverse charging of heavy-duty parallel devices

technical field

The utility model relates to electric power equipment, in particular to a safety device for preventing reverse charging of heavy-moving parallel devices.

Background technique

In the actual operation process of the substation, after a voltage transformer on the subsection bus fails, it is necessary to go to the substation site to stop the faulty voltage transformer from running, and then reset the parallel device for parallel voltage to introduce the secondary voltage of the normal voltage transformer into the The secondary side of the faulty voltage transformer restores the secondary voltage of the sub-section bus where the faulty voltage transformer is located. If the fault voltage transformer does not exit the operation and the parallel device is directly paralleled with voltage, the secondary voltage of the normal voltage transformer will be reversely charged to the primary side of the fault voltage transformer, resulting in the expansion of the fault voltage transformer accident and impact on the normal voltage transformer. Therefore, a safety device capable of preventing reverse charging is needed, so as to improve the safety and reliability of electric equipment.

The utility model with the publication number CN204089166U discloses an intelligent PT voltage reset juxtaposition device, which has: a DSP processor; a communication interface module connected to the DSP processor; a man-machine interface module connected to the DSP processor; connected to the DSP processing The first and second voltage sampling modules of the device; connected to the digital input module of the DSP processor; the DSP processor is connected to the logic control module, which has an output logic control circuit connected to the DSP processor, and the output logic control The circuit is connected with a measurement voltage reset and parallel relay module, a protection voltage reset and parallel relay module, and a metering voltage reset and parallel relay module. The device is used to collect the voltage of the two-section busbar PT, and has the functions of two-section PT voltage reset and two-section PT voltage paralleling.

The voltage reset juxtaposition device in the above reference document has complex structure, high cost, low safety and reliability.

Utility model content

Aiming at the problems of complex structure, high cost, and low safety and reliability in the prior art, the utility model discloses a safety device for preventing reverse charging of heavy-moving parallel devices, which can prevent the voltage failure of the section bus Reverse charging occurs in parallel parallel devices, which effectively improves the safety and reliability of power equipment and networks.

Below is the technical scheme of the utility model.

A safety device for preventing reverse charging of a parallel parallel device, comprising a transformer, a circuit breaker, a rectifier and a relay, the transformer is connected to a segment bus, the rectifier is connected to a transformer, the control terminal of the relay is connected to a rectifier, and the The executive end of the relay is connected to the subsection busbar and the parallel reset device, and the circuit breaker is connected in series in the subsection busbar. A low-voltage alternating current is drawn from the segmental busbar through a transformer, and then the low-voltage alternating current is converted into direct current through a rectifier, and the direct current controls the relay. The large change causes the switch of the relay to change, thereby cutting off the connection between the segmental busbar and the resetting parallel device, preventing reverse charging after it is started, and improving safety.

Preferably, the circuit breaker includes a manual circuit breaker and a remote control circuit breaker.

Preferably, the relay includes an electromagnet, an armature and a clamp, the electromagnet is connected to the rectifier, the armature is detachably connected to the clamp, the armature is electrically connected to the section bus, and the clamp is electrically connected to the heavy parallel device. When the electromagnet is working normally, the force on the armature is uniform, and it is clamped by the fixture, and the circuit is turned on. When the current received by the electromagnet changes, the force on the armature is unbalanced, and it slides out of the fixture, and the circuit is cut off.

Preferably, the armature includes a rotating rod and a contact arranged at one end of the rotating rod. A spring is provided on the side of the rotating rod close to the electromagnet. When the armature and the clamp are closed and conducting, the spring is in a compressed state, and the contact Connect the section bus. When the armature is working normally, it is subjected to the elastic force of the spring and the attractive force of the electromagnet in the opposite direction. The numerical difference between the two forces is small. When it is clamped by the fixture, it is relatively stable and will not slip. When the attraction of the electromagnet increases and the attraction is obviously greater than the elastic force, the armature moves closer to the electromagnet, slides out of the fixture, and cuts off the execution end circuit; when the attraction of the electromagnet decreases and the attraction is obviously smaller than the elastic force, the armature slides away from the electromagnet. cut the power. Therefore, as long as the voltage of the section bus fails, the connection between the armature and the clamp will be disconnected. The clamp includes a pair of clamp rods and a contact piece symmetrically arranged, the contact piece is rotatably connected to one end of the clamp rod, the contact piece abuts against the contact, the other end of the clamp rod is fixed, and the two clamps A spring is arranged in the middle of the rod, and the spring works in a stretched state. The contact piece is used to increase the contact area with the contact to ensure sufficient contact during normal operation. When the contact slides out, the rotatable contact piece reduces the resistance on the contact and improves reliability.

Preferably, the contact is triangular, and the abutment between the contact and the contact piece is an inclined plane. Here it is designed based on the trajectory of the contact.

Preferably, a backup relay is also included, the control end of the backup relay is connected to the rectifier, and the execution end of the backup relay is connected in series with the execution end of the main relay. In case the main relay fails, the backup relay can effectively improve the reliability.

Preferably, an insulating layer is provided on the outside of the contact piece and the clamping rod. After the armature is disconnected from the fixture, it will not be connected again without active operation, which prevents danger during maintenance and improves safety.

The utility model has the beneficial effects of preventing reverse charging of the heavy-duty juxtaposition device during operation, protecting the power network and equipment, and improving safety and reliability.

Description of drawings

Fig. 1 is the embodiment schematic diagram of the present utility model;

Fig. 2 is a partial enlarged view of an embodiment of the utility model;

Fig. 3 is the connection diagram of the embodiment of the present invention in the power grid;

In the figure: 1-transformer, 2-rectifier, 3-armature, 4-fixture, 5-electromagnet, 6-contact piece.

Detailed ways

The technical solution will be further elaborated below in conjunction with the accompanying drawings of the description.

Embodiment: As shown in Figure 1, it is a safety device for preventing reverse charging of a parallel parallel device, including a transformer 1, a circuit breaker, a rectifier 2 and a relay, the transformer 1 is connected to a segmented bus, and the rectifier 2 is connected to Transformer 1, the control end of the relay is connected to the rectifier 2, the execution end of the relay is connected to the section bus and the parallel reset device, and the circuit breaker is connected in series to the section bus. A low-voltage alternating current is drawn from the segmental bus through the transformer 1, and then the low-voltage alternating current is converted into direct current through the rectifier 2. The direct current controls the relay. When the voltage of the segmental bus fails, the alternating current output by the transformer 1 and the direct current output by the rectifier 2 All of them will change greatly, which will cause the switch of the relay to change, thereby cutting off the connection between the segmental busbar and the resetting parallel device, preventing reverse charging after it is started, and improving safety.

In this embodiment, the circuit breaker includes a manual circuit breaker and a remote control circuit breaker.

In this embodiment, the relay includes an electromagnet 5, an armature 3 and a clamp 4, the electromagnet 5 is connected to the rectifier 2, the armature 3 is detachably connected to the clamp 4, the armature 3 is electrically connected to the segmented busbar, and the The clamp 4 is electrically connected with the heavy parallel device. When the electromagnet 5 works normally, the armature 3 is evenly stressed and clamped by the clamp 4, and the circuit is turned on. When the current received by the electromagnet 5 changes, the force on the armature 3 is unbalanced, and the armature 3 slides out of the clamp 4, and the circuit is cut off.

As shown in Figure 2, the armature 3 includes a rotating rod and a contact arranged at one end of the rotating rod. A spring is provided on the side of the rotating rod near the electromagnet 5. When the armature 3 and the clamp 4 are closed and conducting, the spring is In the compressed state, the contact is connected to the segmental busbar, and the contact is detachably connected to the fixture 4 . When the armature 3 is working normally, it is subjected to the elastic force of the spring and the attractive force of the electromagnet 5 in the opposite direction. When the attraction force of the electromagnet 5 increases and the attraction force is obviously greater than the elastic force, the armature 3 moves closer to the electromagnet 5, slides out of the clamp 4, and cuts off the execution end circuit; when the attraction force of the electromagnet 5 decreases and the attraction force is obviously smaller than the elastic force, the armature 3 moves toward Slide away from the electromagnet 5 to cut off the power supply. Therefore, as long as the voltage of the section bus fails, the connection between the armature 3 and the clamp 4 will be disconnected. The clamp 4 includes a pair of clamp rods and a contact piece 6 symmetrically arranged, the contact piece 6 is rotatably connected to one end of the clamp rod, the contact piece 6 is in contact with the contact, and the other end of the clamp rod is fixed , There is a spring between the two clamping rods, and the spring works in a stretched state. The contact piece 6 is used to increase the contact area with the contact to ensure sufficient contact during normal operation. When the contact slides out, the rotatable contact piece 6 reduces the resistance suffered by the contact and improves reliability.

In this embodiment, the contact is triangular, and the contact point between the contact and the contact piece 6 is an inclined surface. Here it is designed based on the trajectory of the contact.

In this embodiment, a backup relay is also included, the control end of the backup relay is connected to the rectifier 2 , and the execution end of the backup relay is connected in series with the execution end of the above-mentioned main relay. In case the main relay fails, the backup relay can effectively improve the reliability.

In this embodiment, an insulating layer is provided on the outside of the contact piece and the clamping rod. After the armature is disconnected from the fixture, it will not be connected again without active operation, which prevents danger during maintenance and improves safety.

For ease of understanding, the connection diagram of the embodiment is provided, as shown in Figure 3, the relay (1-CDJ) and the relay (2-CDJ) are connected in series at 1-1QD7 of section I bus, and the relay is connected in series at 1-1QD9 of section II bus (3-CDJ) and relay (4-CDJ). When the voltage transformer PT1 of section I bus fails, the relay 1-CDJ (or 2-CDJ) will act to disconnect the normally closed contact, thereby disconnecting the line, and the bus section II is the same.

The beneficial effect of this embodiment is to prevent reverse charging of the heavy-duty parallel device during operation, protect the power network and equipment, and improve safety and reliability.

It should be noted that this specific embodiment is only used to further elucidate the technical solution, and is not used to limit the scope of the technical solution. Any modification, equivalent replacement and improvement based on this technical solution should be considered as part of the present invention within the scope of protection.

Claims (7)

1. a kind of safety device for preventing from moving parallel device reverse charge again, which is characterized in that including transformer, breaker, Rectifier and main relay, the transformer connection segment bus, the rectifier connect transformer, the control of the main relay End processed connects rectifier, the actuating station connection segment bus of the main relay and again dynamic parallel device, the breaker series connection In sectionalized busbar.

2. a kind of safety device for preventing from moving parallel device reverse charge again according to claim 1, which is characterized in that The breaker includes hands off device and remote control of circuit breaker.

3. a kind of safety device for preventing from moving parallel device reverse charge again according to claim 1 or 2, feature exist In the main relay includes electromagnet, armature and fixture, and the electromagnet connects rectifier, and the armature and fixture are removable Connection is unloaded, armature is electrically connected with sectionalized busbar, and the fixture is electrically connected with dynamic parallel device again.

4. a kind of safety device for preventing from moving parallel device reverse charge again according to claim 3, which is characterized in that The armature includes bull stick and the contact that bull stick one end is arranged in, and the bull stick is equipped with spring close to electromagnet side, armature with The spring is compressive state when fixture closure conducting, and the contact connection segment bus, the fixture includes symmetrically arranged One end of a pair of of clamping bar and contact chip, the contact chip and clamping bar is rotatably connected, and contact chip is abutted with the contact, the folder The other end of bar is fixed, and spring is equipped among two clamping bars, the spring works are in tensional state.

5. a kind of safety device for preventing from moving parallel device reverse charge again according to claim 4, which is characterized in that The contact is triangle, and contact is inclined-plane with the contact chip place of abutting.

6. a kind of safety device for preventing from moving parallel device reverse charge again according to claim 2, which is characterized in that It further include duplicate relay, the control terminal of the duplicate relay connects rectifier, the actuating station of duplicate relay and above-mentioned master The actuating station of relay is connected.

7. a kind of safety device for preventing from moving parallel device reverse charge again according to claim 4 or 5, feature exist In the outside of the contact chip and clamping bar is equipped with insulating layer.