阅读说明：本技术 变压器储油柜快速断流和排油装置、控制系统及方法 (Transformer oil conservator rapid cut-off and oil discharge device, control system and method ) 是由 谈翀 周斌 季炜 刘光辉 郭鹏鸿 王明胜 柴东新 贾志玲 李庭庭 杨帅 焉媛媛 于 2020-03-17 设计创作，主要内容包括：本发明涉及变压器储油柜快速断流和排油装置,包括：断流模块、排油模块,所述的断流模块设置在变压器储油柜与变压器本体瓦斯继电器之间的油路主联管上,在靠近变压器储油柜一端的油路主联管上设置三通管,所述的排油模块通过过渡联管与三通管的支路连接；所述的断流模块用于当变压器发生漏油或者火灾事故时及时切断事故变压器的补油回路,所述的排油模块用于当变压器发生漏油或者火灾事故时快速将变压器油排至事故油池中。本发明可以在变压器发生火灾事故时有效的切断事故变压器的补油回路,同时将变压器储油柜中的变压器油第一时间自动地排至事故油池中,极大地降低了火灾事故扩大的风险。(The invention relates to a quick current-breaking and oil-discharging device of a transformer oil conservator, which comprises: the oil-gas separator comprises a cutoff module and an oil discharge module, wherein the cutoff module is arranged on an oil path main connecting pipe between a transformer oil conservator and a transformer body gas relay, a three-way pipe is arranged on the oil path main connecting pipe close to one end of the transformer oil conservator, and the oil discharge module is connected with a branch of the three-way pipe through a transition connecting pipe; the oil discharge module is used for quickly discharging transformer oil to an accident oil pool when the transformer has oil leakage or fire accident. The invention can effectively cut off the oil supplementing loop of the transformer in the accident when the transformer has a fire accident, and simultaneously automatically discharges the transformer oil in the transformer oil storage cabinet to the accident oil pool at the first time, thereby greatly reducing the risk of fire accident expansion.)

1. Transformer stores up quick cutout of oil tank and oil extraction device, its characterized in that includes: the oil-gas relay oil-gas separator comprises a current-cut module (3) and an oil discharge module (4), wherein the current-cut module (3) is arranged on an oil-way main connecting pipe between a transformer oil conservator and a transformer body gas relay, a three-way pipe is arranged on the oil-way main connecting pipe close to one end of the transformer oil conservator, and the oil discharge module (4) is connected with a branch of the three-way pipe through a transition connecting pipe;

the cutoff module (3) is used for cutting off an oil supplementing loop of the accident transformer, and the oil discharging module (4) is used for discharging transformer oil to an accident oil pool.

2. The transformer conservator quick current-cut and oil-discharge device according to claim 1, wherein the current-cut module (3) is designed with a U-shaped structure, comprising: u type pipeline (6), the one end of U type pipeline (6) sets up first electronic ball valve (5), and the other end of U type pipeline (6) sets up stop valve (7), connects in parallel at the exit end of U type pipeline (6) and sets up DN8 bypass pipe (8).

3. The transformer conservator rapid cut-off and oil drain device as claimed in claim 2, wherein the first electric ball valve (5), the U-shaped pipeline (6), the cut-off valve (7), DN8 bypass pipe (8) are sealed in the cut-off module fireproof shell (9).

4. The quick cut-off and oil discharge device of the transformer conservator as claimed in claim 3, wherein the first electric ball valve (5) and the cut-off valve (7) are made of stainless steel, DN8 bypass pipe (8) is made of brass.

5. The quick cut-off and oil discharge device of the transformer conservator according to claim 1, characterized in that the oil discharge module (4) adopts a L-shaped structure design and comprises a L type pipeline (10), wherein a first leakage detector (11), a second electric ball valve (12), a second leakage detector (13), a third electric ball valve (14) and a DN80 connecting pipe (17) are sequentially arranged on a long pipeline of a L type pipeline (10), a DN25 stop valve (15) for vacuumizing is arranged at the upper part of the DN80 connecting pipe (17) at the same position of the DN80 connecting pipe (17), a DN25 stop valve (16) for injecting oil is arranged at the lower part of the DN80 connecting pipe (17) for injecting oil, a metal hose (19) is arranged at the outlet end part of a short pipeline of the L type pipeline (10), and the transformer oil is quickly discharged into an oil pool through the metal hose (19).

6. The device for rapidly cutting off and draining oil from a transformer conservator as claimed in claim 5, wherein the L type pipeline (10), the first leakage detector (11), the second electric ball valve (12), the second leakage detector (13), the third electric ball valve (14) and the metal hose (19) are sealed in the fireproof shell (18) of the oil draining module.

7. The device for rapidly cutting off and draining oil from a transformer conservator as claimed in claim 6, wherein the second electric ball valve (12), the third electric ball valve (14) and the DN80 connecting pipe (17) are made of stainless steel.

8. The transformer conservator rapid flow-off and oil drain device according to any of claims 1-7, wherein the flow-off module (3) is connected to the transformer conservator through butterfly valve (1), connected to the oil main pipe through flange, horizontally arranged; the oil discharge module (4) is fixedly arranged at the bottom of the transformer and arranged on one side of the transformer; the three-way pipe is a DN80 three-way pipe (2).

9. Transformer stores up quick cutout of oil tank and oil extraction control system, its characterized in that includes: the transformer conservator rapid current-breaking and oil-discharging device and the remote background control system as claimed in claim 8, wherein the transformer conservator rapid current-breaking and oil-discharging device and the remote background control system adopt IEC61850 to realize data communication;

the remote background control system comprises a P L C control unit, a fire alarm module, a display screen, an electric ball valve control button and a power supply, wherein the P L C control unit is used for automatically and remotely controlling a cutoff module and an oil discharge module, the power supply supplies power to the remote background control system, the electric ball valve control button is used for manually and remotely controlling the cutoff module and the oil discharge module, and the display screen is used for displaying the running state of a transformer.

10. A control method for rapid cut-off and oil discharge of a transformer oil conservator is characterized by comprising the following steps:

step 1, building a transformer conservator rapid current-cut and oil-discharge control system comprising a transformer conservator rapid current-cut and oil-discharge device and a remote background control system according to claim 9;

step 2, starting self-checking by a P L C control unit of the remote background control system;

step 3, a P L C control unit of the remote background control system acquires and controls the quick current-breaking and oil-discharging devices of the 6 transformers corresponding to each pole;

and 4, monitoring the state quantity of the transformer body by the P L C control unit, carrying out AND logic judgment when the P L C control unit receives a transformer body weight gas two-out signal, an alternating current field switch position division node and a transformer fire alarm signal which are externally switched in, and sending out an alarm signal by the P L C control system and simultaneously sending out an instruction for closing the current-cutoff module and opening the oil discharge module when meeting AND logic conditions so as to realize rapid current cutoff and oil discharge.

Technical Field

The invention belongs to the technical field of transformer production and manufacturing, and particularly relates to a device, a control system and a method for quickly cutting off and discharging oil of an oil conservator of a transformer, which are particularly suitable for extra-high voltage alternating current and direct current transmission projects and are also suitable for conventional transformers.

Background

With the rapid development of the strong smart grid in China, the oil-immersed power transformer is the key for realizing the normal operation of the grid, and plays a heart function in a power system. Once major accidents such as fire disaster happen, the power grid in the whole area is broken down, and the loss is immeasurable.

Meanwhile, an oil conservator of the oil-immersed power transformer is positioned on the upper part of the transformer, the oil conservator internally contains about 10 tons of combustible transformer oil, the oil in the oil conservator continuously provides fuel when the body or the lifting seat is broken to explode, even under the continuous baking of a fire disaster, the oil conservator is likely to explode, so that the transformer oil is poured over and deflagration is caused, and the fire accident is likely to further expand to cause great loss.

Disclosure of Invention

In order to solve the technical problems, the invention provides a device, a control system and a method for quickly cutting off and discharging oil of an intelligent transformer oil conservator, and aims to quickly transfer transformer oil in the oil conservator to an in-situ oil pool when a transformer has a fire accident, so that loss in the fire accident is reduced to the maximum extent. The technical scheme adopted by the invention is as follows:

quick cutout of transformer oil conservator and oil extraction device includes: the oil-gas separator comprises a cutoff module and an oil discharge module, wherein the cutoff module is arranged on an oil path main connecting pipe between a transformer oil conservator and a transformer body gas relay, a three-way pipe is arranged on the oil path main connecting pipe close to one end of the transformer oil conservator, and the oil discharge module is connected with a branch of the three-way pipe through a transition connecting pipe;

the oil discharge module is used for quickly discharging transformer oil to an accident oil pool when the transformer has oil leakage or fire accident.

Quick cutout of transformer oil conservator and oil extraction control system includes: the transformer oil conservator rapid cut-off and oil discharge device and the remote background control system are in data communication by adopting IEC 61850;

the remote background control system comprises a P L C control unit, a fire alarm module, a display screen, an electric ball valve control button and a power supply, wherein the P L C control unit is used for automatically and remotely controlling a cutoff module and an oil discharge module, the power supply supplies power to the remote background control system, the electric ball valve control button is used for manually and remotely controlling the cutoff module and the oil discharge module, and the display screen is used for displaying the running state of a transformer.

A control method for rapid cut-off and oil discharge of a transformer oil conservator comprises the following steps:

step 1, building a transformer oil conservator rapid cut-off and oil discharge control system comprising a transformer oil conservator rapid cut-off and oil discharge device and a remote background control system;

step 2, starting self-checking by a P L C control unit of the remote background control system;

step 3, a P L C control unit of the remote background control system acquires and controls the quick current-breaking and oil-discharging devices of the 6 transformers corresponding to each pole;

and 4, monitoring the state quantity of the transformer body by the P L C control unit, carrying out AND logic judgment after the P L C control unit receives a transformer body weight gas two-out signal, an alternating current field switch position division node and a transformer fire alarm signal which are input from the outside, and when the AND logic condition is met, sending out an alarm signal by the P L C control system, simultaneously sending out an instruction of closing the cutoff module and opening the oil discharge module, and starting the quick cutoff and oil discharge module to realize quick cutoff and oil discharge.

The invention has the beneficial effects that:

1) the invention provides a flow interruption and oil discharge device, a control system and a control method for an intelligent transformer oil conservator, which can effectively cut off an oil supply loop of an accident transformer when a fire accident occurs to the transformer, and simultaneously automatically discharge transformer oil in the transformer oil conservator to an accident oil pool at the first time, thereby greatly reducing the risk of fire accident expansion. Meanwhile, the device has the characteristics of simple structure and convenience in installation and transportation, can be applied to a conventional alternating current transformer, and has wide application prospect.

2) The invention can automatically judge the fire condition at the initial stage of the transformer fire, cut off the oil supply loop between the oil conservator and the transformer body, and simultaneously automatically start the oil conservator to discharge oil, thereby realizing the rapid transfer of the transformer oil in the oil conservator when the transformer is in the fire, and having very important significance for ensuring the safe and stable operation of the transformer substation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are specific embodiments of the invention, and that other drawings within the scope of the present application can be obtained by those skilled in the art without inventive effort.

Fig. 1 is a schematic view of the overall structure of a rapid flow shut-off and oil drain apparatus according to an embodiment of the present invention;

fig. 2 is an overall structural view of a current interruptive module of an embodiment of the present invention;

fig. 3 is a schematic view of the overall structure of the oil drainage module according to the embodiment of the invention;

FIG. 4 is a flow chart of a control method of an embodiment of the present invention;

in the figure, 1-butterfly valve, 2-DN 80 three-way pipe, 3-cutout module, 4-oil discharge module, 5-first electric ball valve, 6-U type pipeline, 7-cutout valve, 8-DN 8 bypass pipe, 9-cutout module fireproof shell, 10-L type pipeline, 11-first leakage detector, 12-second electric ball valve, 13-second leakage detector, 14-third electric ball valve, 15-DN 25 stop valve for vacuumizing, 16-DN 25 stop valve for oil injection, 17-DN 80 connecting pipe, 18-oil discharge module fireproof shell and 19-metal hose.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic view of the overall structure of the quick oil shut-off and drain device according to the embodiment of the present invention. A transformer conservator rapid flow-off and oil drainage device, comprising: the butterfly valve 1 is used for connecting an oil storage cabinet of the transformer, the cutoff module 3 is arranged on an oil path main connecting pipe between the butterfly valve 1 and a gas relay of a transformer body, connected through a flange and horizontally arranged, and the cutoff module 3 is used for timely cutting off an oil supplementing loop of an accident transformer when the transformer has oil leakage or a fire accident; the main oil way connecting pipe close to the butterfly valve 1 is provided with a DN80 three-way pipe 2, the oil discharge module 4 is connected with the DN80 three-way pipe 2 through a transition connecting pipe, and the oil discharge module 4 is used for rapidly discharging transformer oil to an accident oil pool when the transformer has oil leakage or fire accident. The oil discharge module 4 is fixedly arranged at the bottom of the transformer and arranged at one side of the transformer.

Fig. 2 is a schematic view of an overall structure of a current interruptive module according to an embodiment of the present invention. The current interrupt module 3 adopts a U-shaped structural design and comprises: a first electric ball valve 5 is arranged at one end of the U-shaped pipeline 6, a stop valve 7 is arranged at the other end of the U-shaped pipeline 6, and a DN8 bypass pipe 8 is arranged at the outlet end of the U-shaped pipeline 6 in parallel; the first electric ball valve 5, the U-shaped pipeline 6, the stop valve 7 and the DN8 bypass pipe 8 are all hermetically arranged in the fireproof shell 9 of the stop module, so that the fireproof performance of the stop module 3 is further improved. When the stop valve 7 is closed by misoperation, the DN8 bypass pipe 8 is used for ensuring that the converter transformer body can breathe normally. When oil leakage or fire accident occurs to the transformer body, the blocking valve 7 in the blocking module 3 is automatically closed by the oil flow impact. Meanwhile, the first electric ball valve 5 in the cutoff module 3 receives a closing instruction sent by a remote control person, and the first electric ball valve 5 is closed.

As shown in FIG. 3, the oil discharge module 4 adopts an L-shaped structure design and comprises a L-shaped pipeline 10, wherein a long pipeline of the L-shaped pipeline 10 is sequentially provided with a first leakage detector 11, a second electric ball valve 12, a second leakage detector 13, a third electric ball valve 14 and a DN80 connecting pipe 17, a DN25 stop valve 15 for vacuumizing is arranged at the upper part of the DN80 connecting pipe 17 at the same position of the DN80 connecting pipe 17, a DN25 stop valve 16 for injecting oil is arranged at the lower part of the DN80 connecting pipe 17 for injecting oil to avoid the transformer in a transformer body from descending, a metal hose 19 is arranged at the outlet end part of a short pipeline of the L-shaped pipeline 10, the transformer oil is quickly discharged into an oil pool through the metal hose 19, the L-shaped pipeline 10 of the oil discharge module 4, the first leakage detector 11, the second electric ball valve 12, the second leakage detector 13, the third electric ball valve 14 and the metal hose 19 are arranged in a fireproof sealing oil discharge shell 18, and the fireproof oil discharge module is further improved in fireproof oil discharge performance.

In the embodiment of the invention, the two electric ball valves 12 and 14 are arranged in the oil discharge module 4 for preventing the false oil discharge of the oil conservator of the converter transformer caused by the false operation of the system in the automatic operation mode, and the maintenance can be arranged immediately after the false operation of one electric ball valve. Two leakage detectors 11 and 13 are provided to more conveniently monitor which electric ball valve generates oil leakage phenomenon, and the electric ball valve is directionally overhauled.

The first electric ball valve 5, the stop valve 7, the second electric ball valve 12, the third electric ball valve 14 and the DN80 connecting pipe 17 are all made of stainless steel, and the DN8 bypass pipe 8 is made of brass.

The electric ball valve consists of two parts: valve + electric actuator. The metal hose 19 is arranged to take the problem of assembly error into consideration, and is adjustable and convenient to install.

A transformer oil conservator rapid cut-off and oil discharge control system comprises the transformer oil conservator rapid cut-off and oil discharge device and a remote background control system, wherein the rapid cut-off and oil discharge device and the remote background control system are in data communication by adopting IEC61850, the remote background control system comprises a P L C control unit, a fire alarm module, a display screen, an electric ball valve control button, a power supply and the like, the power supply supplies power for the remote background control system, the electric ball valve control button is used for manually and remotely controlling the first electric ball valve 5 in the cut-off module 3 to be closed, the second electric ball valve 12 and the third electric ball valve 14 in the oil discharge module 4 to be opened, and the display screen is used for displaying the running state of a transformer and comprises but is not limited to the weight gas signal of the transformer, the power-off signal, the fire alarm signal, the valve state, pipeline leakage, the working environment temperature and humidity of the rapid cut-off and oil discharge device and the like.

The P L C control unit is used for automatically and remotely controlling the cutoff module 3 and the oil discharge module 4. the remote background control system receives a three-out-of-two signal of the transformer body heavy gas which is opened from the outside (the transformer body heavy gas contains three tripping signal nodes, when two or more signal contacts act, the action of the heavy gas is considered to occur, the signal is a redundant means for ensuring the reliability), an AC field switch branch node (which means that an AC field breaker is disconnected, namely, current conversion and power loss is performed), and a transformer fire alarm signal, when the logic condition is met after the internal AND logic judgment is performed (the AND logic judgment means that the three must occur and none of the three occurs, the logic condition is not met), the automatic cutoff and oil discharge control is performed on the oil conservator, at the moment, the first electric ball valve 5 in the cutoff module 3 is automatically closed, meanwhile, the second electric ball valve 12 and the third electric ball valve 14 in the oil discharge module 4 are opened, the cutoff valve 7 is purely mechanically controlled, namely, when the oil flow on two sides of the cutoff valve 7 reaches the specified closing flow, the uncontrolled closing system is controlled, the vacuum stop valve for vacuum pumping, the DN 6315 and the oil discharge valve is used for controlling the vacuum oil pumping system, and the pure manual oil pipe system is.

Furthermore, in the embodiment of the invention, the oil cutoff and oil discharge control system of the transformer oil conservator adopts a dual configuration, and two sets of P L C control units are adopted to operate independently and are mutually standby.

At present, a converter station generally comprises 14 converter transformers, 6 converters per pole, 12 converters in total, and 2 standby converters, wherein each pole comprises 3Y/Y connection converter transformers and 3Y/D connection converter transformers. The automatic oil drainage method of the embodiment of the invention is explained by taking the converter station configured as an example.

Fig. 4 is a flowchart of a control method according to an embodiment of the present invention. A control method for rapid cut-off and oil discharge of a transformer oil conservator comprises the following steps:

the method comprises the following steps that 1, a transformer oil conservator rapid flow-off and oil drainage control system comprising a transformer oil conservator rapid flow-off and oil drainage device and a remote background control system is built, the rapid flow-off and oil drainage device and the remote background control system realize data communication by adopting IEC61850, and a P L C control unit of the remote background control system adopts two sets of P L C control units to independently operate and mutually stand by;

step 2, starting self-checking of a P L C control unit of the remote background control system, such as self-checking of a power supply, equipment failure, control state selection and the like;

step 3, a P L C control unit of the remote background control system acquires and controls the quick current-breaking and oil-discharging devices of the 6 transformers corresponding to each pole;

step 4, the P L C control unit monitors state quantities such as a transformer body weight gas signal, a power-off signal, a fire alarm signal, a valve state, pipeline leakage, a rapid flow-off and working environment temperature and humidity of an oil discharge device, when the P L C control unit receives a transformer body weight gas two-out signal, an alternating current field switch division node and a transformer fire alarm signal which are input from the outside, after AND logic judgment is carried out in the P L C control unit, when AND logic conditions are met, the P L C control system can send out the alarm signal and send out an instruction for closing the first electric ball valve 5 in the flow-off module 3, and simultaneously open the second electric ball valve 12 and the third electric ball valve 14 in the oil discharge module 4, and start the rapid flow-off and oil discharge modules to realize rapid flow-off and oil discharge, the electric ball valve in the flow-off module 3 is changed from an open state to a closed state, and the electric ball valve in the oil discharge module 4 is changed from a closed state to an open state, and the electric ball valves.

Finally, it is to be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, and the scope of the present invention is not limited thereto. Those skilled in the art will understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.