CN113823523A

CN113823523A - Automatic exhaust device for gas relay of rectifier transformer

Info

Publication number: CN113823523A
Application number: CN202111159741.0A
Authority: CN
Inventors: 段艳红; 赵建刚; 孙力; 岳鹏; 王旭东; 郝文杰
Original assignee: Shanxi Qinxin Energy Group Co Ltd
Current assignee: Shanxi Qinxin Energy Group Co Ltd
Priority date: 2021-09-30
Filing date: 2021-09-30
Publication date: 2021-12-21

Abstract

The invention discloses an automatic exhaust device for a gas relay of a rectifier transformer. The gas outlet of the gas relay is connected with the first exhaust pipe, the normally closed electromagnetic valve and the second exhaust pipe in sequence and then led into the gas collection container, a normally open electromagnetic valve is arranged at a gas outlet above the gas collection container, and the automatic exhaust control module controls the normally closed electromagnetic valve to be opened and closed to enable gas of the gas relay to be discharged through the normally open electromagnetic valve. This application does not change the basis of original light buchholz relay structure, adopts two solenoid valves to carry out dual protection to rectifier transformer buchholz relay emission gas for the first time, with whether have light buchholz action signal and whether solenoid valve normally closed switch to close the judgement and whether carry out follow-up corresponding action, reliable automatic exhaust gas when guaranteeing light buchholz action, and reduce the resource simultaneously and consume, personnel's risk of electrocuting, and the risk of equipment damage.

Description

Automatic exhaust device for gas relay of rectifier transformer

Technical Field

The invention relates to the exhaust technology of a transformer gas relay, in particular to an automatic exhaust device of a rectifier transformer gas relay.

Background

The traditional transformer gas relay mounting structure comprises a transformer body, an oil conservator connecting pipe and the like. The gas relay is an important main protection of the transformer and is arranged in an oil pipe below an oil conservator of the transformer. The transformer body, the oil conservator, the gas relay and the connecting pipes are all filled with insulating oil.

The special rectifier transformer is different from a common transformer in long-term stable operation and belongs to intermittent operation, each operation period from small load to full load is about 72 hours, the temperature of the transformer is changed rapidly, gas is generated in the transformer, light gas alarm action can occur after the operation is performed for several periods, and a maintainer frequently handles a first high-voltage work ticket and climbs the transformer to discharge the gas. Therefore, maintenance personnel must ascend, and meanwhile, a sealing element of the gas relay exhaust nozzle is easy to loosen and seep oil to cause misoperation of the gas relay.

In view of this, an automatic exhaust device for a gas relay of a rectifier transformer is particularly provided.

Disclosure of Invention

Compared with the prior art, the automatic exhaust device for the rectifier transformer gas relay provided by the invention has the advantages that the original gas relay structure is not changed, the gas emission of the rectifier transformer gas relay is protected doubly by adopting the two electromagnetic valves for the first time, and the gas is reliably and automatically exhausted when the rectifier transformer gas relay operates in a light gas mode. This application both has been applicable to the self-bleeding of general rectifier transformer buchholz relay, also is applicable to the self-bleeding of special type rectifier transformer buchholz relay.

Another object of the present invention is to provide a control method for an automatic exhaust device of a rectifier transformer buchholz relay, which can protect a transformer when an electromagnetic valve of the rectifier transformer buchholz relay fails.

In order to solve the above problems, the technical scheme adopted by the invention is as follows:

the utility model provides a rectifier transformer buchholz relay automatic exhaust apparatus, includes oil circuit, buchholz relay installs in the oil circuit, its characterized in that: the gas outlet of the gas relay is connected with the first exhaust pipe, the normally closed solenoid valve and the second exhaust pipe in sequence and then led into the gas collecting container, a normally open solenoid valve is arranged at a gas outlet above the gas collecting container, the automatic exhaust control module controls the normally closed solenoid valve to be opened and closed so that gas of the gas relay is discharged through the normally open solenoid valve, and the gas collecting container is provided with a normally open solenoid valve to control the gas collecting container to exhaust.

Furthermore, the automatic exhaust control module comprises an exhaust trigger module, a normally closed electromagnetic valve control circuit and a delay control circuit which are connected in parallel, and the exhaust trigger module triggers the normally closed electromagnetic valve control circuit and the delay control circuit to enable the normally closed electromagnetic valve to be opened for certain time to exhaust.

Further, the exhaust trigger module comprises a light gas protection action circuit and a protection control circuit which are connected in parallel, the protection action circuit comprises an intermediate relay KA1 and a light gas contact point WS which are connected in series, and the light gas protection control circuit comprises: the intermediate relay KA2 and the normally open contact KA11 of the intermediate relay KA1 which are connected in series, the normally closed contact KT1 of the time relay contact point and the normally open contact KA21 of the intermediate relay KA2 are connected in series and then connected with the two ends of the KA11 in parallel;

the normally closed electromagnetic valve control circuit comprises a normally closed electromagnetic valve YV1 and a normally open contact KA23 of an intermediate relay KA2 which are connected in series;

the time delay control circuit comprises a time relay KT and a normally open contact KA24 of an intermediate relay KA2 which are connected in series.

The exhaust trigger module is connected with the exhaust valve, the exhaust trigger module is connected with the exhaust trigger module, the exhaust trigger module and the exhaust trigger module, the exhaust trigger module is connected with the exhaust trigger module in parallel, the exhaust trigger module and the exhaust trigger module are connected with the exhaust trigger module, and the exhaust trigger module.

The first alarm circuit comprises a normally open contact KA22 of the sounder PAR1 and the intermediate relay KA2 connected in series.

Furthermore, the automatic exhaust control module also comprises a fault detection and control module which controls the normally open electromagnetic valve to be closed to close the gas collection container to exhaust when detecting that the normally closed electromagnetic valve YV1 has a fault.

Furthermore, a liquid level control switch is arranged in the gas collection container, the fault detection and control module comprises a liquid level control switch trigger circuit and a normally open solenoid valve control circuit which are connected with the exhaust trigger module in parallel, and when the liquid level control switch in the gas collection container detects that the normally closed solenoid valve cannot be closed to cause the oil level in the gas collection container to rise, the normally open solenoid valve control circuit in the fault detection and control module is triggered to close the normally open solenoid valve.

Further, the liquid level control switch trigger circuit comprises an intermediate relay KA3 and a liquid level switch contact SQ which are connected in series;

the normally open solenoid valve control circuit comprises a normally open solenoid valve YV2 and a normally open contact KA32 of an intermediate relay KA 3.

The liquid level control switch is a float switch or a liquid level display.

Furthermore, the fault detection and control module also comprises a second alarm circuit connected with the exhaust triggering module in parallel;

when a liquid level control switch in the gas collection container detects that the normally closed solenoid valve does not return to a closed state to cause the oil level in the gas collection container to rise, a second alarm circuit in the fault detection and control module is triggered to alarm and close the normally open solenoid valve;

the second alarm circuit includes the sounder PAR2 and the normally open contact KA31 of the intermediate relay KA 3.

According to a second aspect of the invention, the invention relates to a control method of an automatic exhaust device of a rectifier transformer gas relay, which comprises the following steps:

s31, judging whether the gas relay sends a light gas signal after the circuit is electrified;

if not, ending the flow;

s32, if the light gas protection action of the gas relay sends out a signal, the sounder gives out a voice prompt to discharge the light gas;

s33, opening the normally closed solenoid valve and keeping the normally closed solenoid valve in an opening state in a delay period;

s34, after a delay period, judging whether the normally closed electromagnetic valve 4 is closed or not;

and closing the valve to finish the exhaust.

Further, the method also comprises the following steps:

s35, if the normally closed solenoid valve 14 is not closed, an alarm signal is prompted by a sounder to prompt that the normally closed solenoid valve 14 has a fault;

s36, triggering action of a relay in the float switch 18;

s37, judging whether the normally open electromagnetic valve is closed or not;

and if the normally open electromagnetic valve is in a closed state, ending the process. If the normally open solenoid valve is not in the closed state, executing step S38;

and S38, manually closing the normally open solenoid valve by workers.

The beneficial effect of this application includes: two electromagnetic valves are adopted to carry out double protection on the gas discharge of the gas relay of the rectifying transformer. The first heavy protection is that after gas is generated, the light gas protection acts to send out a signal, and the automatic exhaust device is started until the action signal is not displayed after the exhaust is finished. The second protection can also detect the fault of the normally closed solenoid valve and close the normally open solenoid valve to exhaust in the exhaust process. The problem of produce gas in the transformer and lead to frequently appearing light gas warning has effectively been solved. The gas is reliably and automatically discharged when the light gas acts, and meanwhile, the resource consumption and the potential electric shock risk caused by close-distance operation of personnel are reduced, and the risk that equipment is damaged due to the fact that heavy gas protection is required to be stopped when manual exhaust is carried out is reduced.

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1 is a schematic view of the piping connection of the present invention;

FIG. 2 is a schematic diagram of the automatic exhaust control circuit of the present invention;

FIG. 3 is an automatic exhaust flow diagram of the present invention;

in fig. 1: 1. an oil path; 2. a light gas relay; 3. a first section of exhaust pipe; 4. a normally closed solenoid valve; 5. a second section of exhaust pipe; 6. a gas collection container; 7. a normally open solenoid valve; 8. a liquid level switch.

In fig. 2: the device comprises a light gas contact WS, a normally closed electromagnetic valve YV1, a normally open electromagnetic valve YV2, an intermediate relay KA1, an intermediate relay KA2, an intermediate relay KA3, a time relay KT, a first sound generator PAR1, a second sound generator PAR2 and a liquid level switch SQ; the intermediate relay KA1 is provided with a normally open contact KA 11; the intermediate relay KA2 is provided with 4 normally open contacts KA21, KA22, KA23 and KA 24; the intermediate relay KA3 is provided with normally open contacts KA31 and KA 32; the time relay is provided with a normally closed contact KT 1.

It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The first embodiment is as follows: as shown in fig. 1 to 3, the present invention provides a technical solution of an automatic exhaust device for a gas relay of a rectifier transformer, wherein an automatic exhaust control module circuit controls the opening and closing of a normally closed electromagnetic valve to enable gas of the gas relay to be exhausted through a normally open electromagnetic valve, which specifically comprises the following steps:

referring to fig. 1, the pipeline connection of the automatic exhaust device of the rectifier transformer buchholz relay comprises a first exhaust pipe 3, a second exhaust pipe 5, a normally closed electromagnetic valve 4, a gas collecting container 6 and a normally open electromagnetic valve 7.

As shown in fig. 1, one end of the first exhaust pipe 3 is connected to an exhaust nozzle of the buchholz relay 2, the other end of the first exhaust pipe 3 is connected to the normally closed solenoid valve 4, one end of the second exhaust pipe 5 is connected to the normally closed solenoid valve 4, the other end of the second exhaust pipe 5 is connected to the gas collecting container 6, and the normally open solenoid valve 7 is arranged at an exhaust port of the gas collecting container 6.

After the gas is accumulated in the buchholz relay 2, the light buchholz contact WS of the buchholz relay 2 is closed, and the gas accumulated in the buchholz relay 2 is discharged from the exhaust nozzle into the first exhaust pipe 3. The light gas contact WS of the gas relay 2 is closed to trigger the normally closed electromagnetic valve 4 to be opened, and the gas in the first exhaust pipe 3 flows into the second exhaust pipe 5 from the normally closed electromagnetic valve 4 in an open state, and then enters the gas collection container 6 through the second exhaust pipe 5. When the normally open electromagnetic valve 7 of the exhaust port of the gas collection container 6 is in an open state, gas entering the gas collection container 6 can be automatically discharged from the exhaust port of the gas collection container through the normally open electromagnetic valve arranged on the gas collection container, the whole process does not need staff intervention, and the automatic exhaust function of a gas relay can be realized.

Fig. 2 is a schematic diagram of a control circuit of an automatic exhaust device of a rectifier transformer buchholz relay according to an embodiment of the present application.

As shown in fig. 2, the present application provides a control circuit for use in conjunction with the above tubing connector apparatus, the control circuit comprising: the light gas protection device comprises a light gas protection action circuit (10), a protection control circuit (20), a loop (30), a first alarm circuit (40), a normally closed solenoid valve control circuit (50), a time delay control circuit (60), a normally open control circuit and a normally open solenoid valve YV2 (namely a coil of a normally open solenoid valve 7 in figure 1) circuit (90). Any two of the above circuits (10), (20), (40), (50), (60), and (90) are parallel circuits. The light gas protection action circuit (10) and the protection control circuit (20) are connected in parallel to form an exhaust trigger module.

As shown in fig. 1 and 2:

the light gas protection operation circuit (10) includes an intermediate relay KA1 coil and a light gas contact WS of a gas relay (i.e., 2 in fig. 1) connected in series.

The protection control circuit (20) comprises an intermediate relay KA2 coil and a normally open contact KA11 of an intermediate relay KA1 which are connected in series.

One end of a contact KT1 of the time relay KT and a normally open contact KA21(30) of the intermediate relay KA2 which are connected in series is positioned between the intermediate relay KA2 and a normally open contact KA11 point of the intermediate relay KA1, and is connected with the normally open contact KA11 of the intermediate relay KA1 in parallel.

The first alarm circuit (40) comprises a sounder PAR1 and a normally open contact KA22 of an intermediate relay KA2 connected in series.

The normally closed solenoid valve control circuit (50) includes a normally closed solenoid valve YV1 (i.e., the coil of 4 in fig. 1) and a normally open contact KA23 of an intermediate relay KA2 connected in series.

The time delay control circuit (60) comprises a time relay contact KT and a normally open contact KA24 of an intermediate relay KA2 which are connected in series. The time of the contact of the time relay KT is a preset time, that is, after delaying the preset time, the contact KT1 of the time relay KT is turned off.

The following description will be made with reference to fig. 1 and 2 as an example, regarding a schematic diagram of a control circuit of an automatic exhaust device of a rectifier transformer buchholz relay.

When the light gas protection action of the gas relay sends a signal, the contact WS of the gas relay is closed, the light gas protection action circuit (10) is connected, the coil of the intermediate relay KA1 is electrified, the normally open contact KA11 of the intermediate relay KA1 is closed, the protection control circuit (20) is connected, the coil of the intermediate relay KA2 is electrified, and then the normally open contacts KA21, KA22, KA23 and KA24 of the intermediate relays KA2 of the circuits (30), (40), (50) and (60) are closed. The loop (40) is switched on, and the first sound emitter PAR1 voice prompts that light gas emission is about to be carried out; when the loop (50) is switched on, the YV1 coil is electrified to enable the normally closed electromagnetic valve 4 to be opened gradually, the air starts to be exhausted to the air collecting container, and finally the gas is exhausted through the normally open electromagnetic valve 7. The circuit (60) is switched on, the time relay KT is electrified, the time delay period of the normally closed contact KT11 of the time relay KT1 can be fixed to be a preset number of seconds and then switched off, and the time is started after the time delay period is electrified.

When the circuit (50) is connected and the normally closed electromagnetic valve 4 is opened, the gas in the first exhaust pipe 3 flows from the normally closed electromagnetic valve 4 in an open state to enter the second exhaust pipe 5 to start exhausting, the contact WS of the gas relay is disconnected, the coil of the intermediate relay KA1 is powered off, the normally open contact KA11 of the intermediate relay KA1 is opened, and the circuit (10) and the circuit (20) are powered off simultaneously. The normally closed contact KT1 of the time relay KT is disconnected after the delay preset time is up, the loop (30) is powered off, the coil of the intermediate relay KA2 is powered off, and meanwhile, the loop (40), the loop (50) and the loop (60) are powered off, and the sound generator PAR1 does not perform voice prompt any more. The time relay KT loses power, and a normally closed contact KT1 of the time relay KT of the loop (30) returns to a normally closed state; the normally closed solenoid valve 4 returns to the normally closed state, and the exhaust is finished. If the light gas action still has a signal after the primary exhaust is finished, the operation is carried out again until the light gas relay does not display the action signal any more.

After having the above structural features, the present application can be implemented as the following process:

as shown in fig. 1, fig. 2 and fig. 3, the automatic exhaust flow of the automatic exhaust device for the rectifier transformer buchholz relay provided in this embodiment includes the following steps:

and S31, after the circuit is electrified, judging whether the gas relay 2 sends out a light gas signal or not.

If not, the flow ends.

S32, if the light gas protection action of the gas relay 2 sends out signal, the sounder voice prompts the light gas discharge.

S33, the normally closed solenoid valve 4 is opened and remains open for a delay period.

S34, after a delay period, it is determined whether the normally closed solenoid valve 4 is closed.

And ending the process if the normally closed electromagnetic valve 4 is closed. If the light gas action still has a signal after one-time exhaust is finished, the operation can be repeated until the light gas relay does not display the action signal any more.

In the above process, the normally open solenoid valve 7 is in a normally open state, gas is discharged from the gas collecting container 6, and the gas collecting container 6 is an oil conservator (not shown) connected with an oil circuit.

Example two: in the pipeline connecting device and the automatic exhaust control circuit, if the normally closed electromagnetic valve YV1 fails to close due to a fault, the invention also provides a technical scheme of the device fault detection and control module.

As shown in fig. 2, the fault detection and control module includes: a liquid level control switch trigger circuit (70), a second alarm circuit (80) and a normally open solenoid valve control circuit (90). Any two of the loops (70), (80), (90) are parallel circuits, and any two of the loops (10), (20), (40), (50), (60) are parallel circuits.

The liquid level control switch trigger circuit (70) comprises a coil of a relay KA3 and a contact SQ of a float switch (namely 8 in figure 1) which are connected in series.

The second alarm circuit (80) comprises a second acoustical generator PAR2 and a normally open contact KA31 of an intermediate relay KA3 connected in series.

Further, the normally open solenoid valve control circuit (90) may further include a normally open contact KA32 of the relay KA3 connected in series with the normally open solenoid valve YV2 (i.e., the coil of 7 in fig. 1).

On the basis of the first embodiment (no longer described herein), if the normally closed solenoid valve 4 fails to close due to a fault, the oil level in the relay rises to the position of the float switch, the contact point SQ of the float switch acts, the coil of the intermediate relay KA3 is electrified, and the loop (70) is electrified; normally open contacts KA31 and KA32 of the intermediate relay KA3 are closed, a loop (80) and a loop (90) are electrified, a second sound generator PAR2 prompts a fault in a voice mode, and meanwhile the electromagnetic valve 7 is closed. If the electromagnetic valve 7 fails to close due to a fault, the electromagnetic valve should be manually closed.

The complete technical scheme of the dual-protection exhaust control circuit provided by the embodiment is as follows:

the utility model provides a rectifier transformer buchholz relay automatic exhaust apparatus, its tube coupling includes first blast pipe 3, second blast pipe 5, normally closed solenoid valve 4, gas collection container 6 and normally open solenoid valve 7. As shown in fig. 1, one end of the first exhaust pipe 3 is connected to an exhaust nozzle of the buchholz relay 2, and the other end of the first exhaust pipe 3 is connected to the normally closed solenoid valve 4. One end of the second exhaust pipe 5 is connected to the normally closed solenoid valve 4, and the other end of the second exhaust pipe 5 is connected to the gas collection container 6. Normally open solenoid valve 7 sets up in the gas vent of gas collection container 6, and after the amasss in buchholz relay 2 has gas, buchholz relay 2's light gas contact closed, and the gas that accumulates in buchholz relay 2 is discharged into first blast pipe 3 from the exhaust nozzle. The light gas contact of the gas relay 2 is closed to trigger the normally closed electromagnetic valve 4 to be opened, and the gas in the first exhaust pipe 3 flows into the second exhaust pipe 5 from the normally closed electromagnetic valve 4 in an open state, and then enters the gas collection container 6 through the second exhaust pipe 5. When the normally open electromagnetic valve 7 of the exhaust port of the gas collection container 6 is in an open state, gas entering the gas collection container 6 can be automatically discharged from the exhaust port, the whole process does not need staff intervention, and the automatic exhaust function of the gas relay can be realized.

Optionally, as shown in fig. 1, the rectifier transformer buchholz relay exhaust device may further include a float switch 8 disposed on the sidewall of the gas collecting pipe. When the normally closed electromagnetic valve 4 breaks down, the normally closed electromagnetic valve cannot be in a closed state, because the pipelines are communicated, oil flows into the gas collection container to cause the oil level to rise to the position of the float switch, and then the contact of the float switch 8 acts to trigger the normally open electromagnetic valve 7 to be in a closed state. In other embodiments, the float switch 8 may be replaced by a liquid level display which triggers the normally open solenoid valve 7 to be in a closed state after the normally closed solenoid valve 4 fails to be in a closed state.

A control circuit based on foretell rectifier transformer buchholz relay exhaust apparatus, this control circuit includes: circuits (10) (20) (30) (40) (50) (60) (70) (80) (90). Wherein any two of the circuits (10), (20), (40), (50), (60), (70), (80), (90) are parallel circuits.

As shown in fig. 1 and 2, the circuit (10) comprises an intermediate relay KA1 and a light gas contact WS of a buchholz relay (i.e. 2 in fig. 1) connected in series.

The circuit (20) comprises an intermediate relay KA2 and a normally open contact KA11 of an intermediate relay KA1 which are connected in series.

The circuit (30) comprises a normally closed contact KT1 of a time relay KT and a normally open contact KA21 of an intermediate relay KA2 connected in series. One end of the loop (30) is positioned between the intermediate relay KA2 and the normally open contact KA11 of the intermediate relay KA1 and is connected with the normally open contact KA11 of the intermediate relay KA1 in parallel. The time of the normally closed contact of the time relay KT is a preset time, that is, after delaying the preset time, the contact KT1 of the time relay KT is opened.

The circuit (40) comprises a first sound emitter PAR1 and a normally open contact KA22 of an intermediate relay KA2 which are connected in series.

The circuit (50) includes a normally closed solenoid valve YV1 (i.e., a coil of the normally closed solenoid valve 4 in fig. 1) and a normally open contact KA23 of an intermediate relay KA2 connected in series.

The circuit (60) comprises a time relay KT and a normally open contact KA24 of an intermediate relay KA2 connected in series.

The circuit (70) includes relay KA3 and contact SQ of a float switch (i.e., 8 in fig. 1) connected in series.

The circuit (80) includes a second sounder PAR2 and a normally open contact KA31 of an intermediate relay KA3 in series.

The circuit (90) includes a normally open solenoid valve YV2 (i.e., the coil of the normally open solenoid valve 7 in fig. 1) and a normally open contact KA32 of the intermediate relay KA 3.

After the circuit is installed on a transformer gas relay, the working process is as shown in fig. 2: WS is a light gas contact point of the gas relay, after the circuit is electrified and starts to work, when the light gas protection action of the gas relay sends a signal, WS is closed, the loop (10) is connected, the KA1 coil is electrified, the normally open contact KA11 is closed, the loop (20) is connected, the KA2 coil is electrified, and then the normally open contacts KA21, KA22, KA23 and KA24 of the loops (30), 40, 50 and 60) are closed. The loop (40) is switched on, and the first sound emitter PAR1 voice prompts that light gas emission is about to be carried out; when the loop (50) is switched on, the YV1 coil is electrified to enable the normally closed electromagnetic valve 4 to be opened gradually, the air starts to be exhausted to the air collecting container, and finally the gas is exhausted through the normally open electromagnetic valve 7. The circuit (60) is switched on, the time relay KT is electrified, the time delay period of the normally closed contact KT11 of the time relay KT1 can be fixed to be a preset number of seconds and then switched off, and the time is started after the time delay period is electrified.

Because the loop (50) is connected, the normally closed electromagnetic valve 4 is opened, the gas in the first exhaust pipe 3 flows into the second exhaust pipe 5 from the normally closed electromagnetic valve 4 in an open state, when the exhaust is started, the contact WS of the gas relay is disconnected, the coil of the intermediate relay KA1 is powered off, meanwhile, the normally open contact KA11 of the intermediate relay KA1 is opened, and the loop (10) and the loop (20) are powered off simultaneously. The normally closed contact KT1 of the time relay KT is disconnected after the delay preset time is up, the loop (30) is powered off, the coil of the intermediate relay KA2 is powered off, and meanwhile, the loop (40), the loop (50) and the loop (60) are powered off, and the sound generator PAR1 does not perform voice prompt any more. The time relay KT loses power, and a normally closed contact KT1 of the time relay KT of the loop (30) returns to a normally closed state; the normally closed solenoid valve 4 returns to the normally closed state, and the exhaust is finished. If the light gas action still has a signal after the primary exhaust is finished, the operation is carried out again until the light gas relay does not display the action signal any more.

If the normally closed electromagnetic valve 4 fails to close, the oil level in the gas collection container rises, the contact SQ of the float switch (8) is triggered to act, the coil of the KA3 intermediate relay is electrified, and the loop (70) is electrified; normally open contacts KA31 and KA32 are closed, circuits (80) and (90) are electrified, a sound generator PAR2 prompts a fault, and a normally open solenoid valve is closed. If the normally open electromagnetic valve 7 fails to close, the electromagnetic valve is manually closed.

as shown in fig. 1, fig. 2, and fig. 3, an automatic exhaust flow of an automatic exhaust device for a gas relay of a rectifier transformer according to an embodiment of the present application includes the following steps:

If not, the flow ends.

And S35, after the steps, if the normally closed electromagnetic valve 4 is not closed, an alarm signal is sent by a sounder to prompt the normally closed electromagnetic valve 4 to have a fault. And S36, triggering the action of a relay in the float switch 18.

And S37, judging whether the normally open electromagnetic valve 7 is closed or not.

If the normally open electromagnetic valve 7 is in the closed state, the process is ended. If the normally open electromagnetic valve 7 is not in the closed state, step S38 is executed.

And S38, the worker is required to manually close the normally open solenoid valve 7.

The present embodiment provides a set of all preferred ways, which is convenient to implement as an optimal set way on site.

The above embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention in any way, and although the present invention has been disclosed by the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make various changes and modifications to the equivalent embodiments by using the technical contents disclosed above without departing from the technical scope of the present invention, and the embodiments in the above embodiments can be further combined or replaced, but any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the technical scope of the present invention.

Claims

1. The utility model provides a rectifier transformer buchholz relay automatic exhaust apparatus, includes oil circuit, buchholz relay installs in the oil circuit, its characterized in that: the gas outlet of the gas relay is connected with the first exhaust pipe, the normally closed electromagnetic valve and the second exhaust pipe in sequence and then led into the gas collecting container, a normally open electromagnetic valve is arranged at a gas outlet above the gas collecting container, the automatic exhaust control module controls the normally closed electromagnetic valve to be opened and closed, so that gas of the gas relay is discharged from the gas outlet above the gas collecting container, and the gas collecting container is provided with a normally open electromagnetic valve for controlling the gas collecting container to exhaust.

2. The automatic exhaust device for a rectifier transformer gas relay according to claim 1, wherein: the automatic exhaust control module comprises an exhaust trigger module, a normally closed electromagnetic valve control circuit and a delay control circuit which are connected in parallel, wherein the exhaust trigger module triggers the normally closed electromagnetic valve control circuit and the delay control circuit to enable the normally closed electromagnetic valve to be opened for certain time to exhaust.

3. The automatic exhaust device for a rectifier transformer gas relay according to claim 2, wherein:

the exhaust trigger module comprises a light gas protection action circuit and a protection control circuit which are connected in parallel, the light gas protection action circuit comprises an intermediate relay KA1 and a light gas contact point WS which are connected in series, the protection control circuit comprises an intermediate relay KA2 and a normally open contact KA11 of the intermediate relay KA1 which are connected in series, and the normally open contact KT1 of the time relay contact point and the normally open contact KA21 of the intermediate relay KA2 are connected in series and then connected to two ends of the KA11 in parallel;

4. The automatic exhaust device for a rectifier transformer gas relay according to claim 3, wherein: the exhaust trigger module is connected with the exhaust valve and is used for triggering the first alarm circuit to alarm, and the alarm is finished after the power is off in a delay period;

5. The automatic exhaust device for a rectifier transformer gas relay according to claim 1, wherein: the automatic exhaust control module also comprises a fault detection and control module which controls the normally open electromagnetic valve to be closed to close the gas collection container to exhaust when detecting that the normally closed electromagnetic valve YV1 has a fault.

6. The automatic exhaust device for a rectifier transformer gas relay according to claim 5, wherein: the gas collection container is internally provided with a liquid level control switch, the fault detection and control module comprises a liquid level control switch trigger circuit and a normally open solenoid valve control circuit which are connected with the exhaust trigger module in parallel, and when the liquid level control switch in the gas collection container detects that the normally closed solenoid valve cannot be closed and the oil level in the gas collection container rises, the normally open solenoid valve control circuit in the fault detection and control module is triggered to close the normally open solenoid valve.

7. The automatic exhaust device for a rectifier transformer gas relay according to claim 6, wherein: the liquid level control switch trigger circuit comprises an intermediate relay KA3 and a liquid level switch contact SQ which are connected in series;

the normally open electromagnetic valve control circuit comprises a normally open electromagnetic valve YV2 and a normally open contact KA32 of an intermediate relay KA 3;

the liquid level control switch is a float switch or a liquid level display.

8. The automatic exhaust device for a rectifier transformer gas relay according to claim 6, wherein: the fault detection and control module further comprises a second alarm circuit connected with the exhaust trigger module in parallel;

9. The control method of the automatic exhaust device of the rectifier transformer buchholz relay of claims 1 to 8, comprising the steps of:

if not, ending the flow;

and closing the valve to finish the exhaust.

10. The control method of the automatic exhaust device of the rectifier transformer buchholz relay according to claim 9, further comprising the steps of:

s36, triggering action of a relay in the float switch 18;

s37, judging whether the normally open electromagnetic valve is closed or not;

and S38, manually closing the normally open solenoid valve by workers.