CN212723281U - Traction transformer fault diagnosis circuit, power supply circuit and rail transit vehicle - Google Patents
Traction transformer fault diagnosis circuit, power supply circuit and rail transit vehicle Download PDFInfo
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- CN212723281U CN212723281U CN202021642133.6U CN202021642133U CN212723281U CN 212723281 U CN212723281 U CN 212723281U CN 202021642133 U CN202021642133 U CN 202021642133U CN 212723281 U CN212723281 U CN 212723281U
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Abstract
The application discloses traction transformer fault diagnosis circuit, power supply circuit and rail transit vehicle, traction transformer fault diagnosis circuit includes: the oil level protection system comprises a vacuum circuit breaker, an oil level protection relay, an oil pressure protection relay, a temperature protection relay, a transformer fault relay, an oil level protection normally open switch, an oil pressure protection normally open switch and an oil temperature protection normally open switch; the oil level protection normally open switch, the oil pressure protection normally open switch and the oil temperature protection normally open switch are located inside the traction transformer. The traction transformer fault diagnosis circuit has the characteristics of simple structure and high reliability, and when a network fault occurs or the network cannot monitor the oil level, pressure and temperature information of the traction transformer in real time, the traction transformer fault diagnosis circuit is used as the last measure for monitoring the traction transformer, so that the traction transformer is protected, and the safety of rail transit vehicles is improved.
Description
Technical Field
The utility model belongs to the technical field of the rail transit technique and specifically relates to a traction transformer fault diagnosis circuit, supply circuit and rail transit vehicle are related to.
Background
The traction transformer transfers the electric energy of one circuit to another circuit by utilizing the principle of electromagnetic induction. For rail vehicles, a traction transformer is one of the most important devices, and is a core part of the whole electric traction system, and the stable operation of the rail vehicle can be ensured by using the traction transformer.
When the rail transit vehicle is used, the working state of the traction transformer has a large influence on the safe operation of the train as an energy conversion component. For example, when a high-power traction transformer works, a large amount of heat is generated, and if the heat cannot be conducted out in time, the internal temperature of the transformer is too high, so that serious consequences such as coil aging and insulation failure can be caused.
Therefore, in the prior art, network equipment is adopted to monitor the working state of the traction transformer in real time. However, when a network fails or a network device fails, the working state of the traction transformer cannot be monitored in real time, and once the traction transformer fails, a safety problem is caused.
SUMMERY OF THE UTILITY MODEL
In view of the above problem, the application provides a traction transformer fault diagnosis circuit, power supply circuit and rail transit vehicle, can improve rail transit vehicle's security.
The present application provides in a first aspect a traction transformer fault diagnosis circuit, including: the oil level protection system comprises a vacuum circuit breaker, an oil level protection relay, an oil pressure protection relay, a temperature protection relay, a transformer fault relay, an oil level protection normally open switch, an oil pressure protection normally open switch and an oil temperature protection normally open switch; the oil level protection normally open switch, the oil pressure protection normally open switch and the oil temperature protection normally open switch are positioned in the traction transformer;
a coil of the oil level protection relay is connected with the oil level protection normally-open switch in series to form a first branch circuit; a coil of the oil pressure protection relay is connected with the oil pressure protection normally open switch in series to form a second branch circuit; a coil of the temperature protection relay is connected with the oil temperature protection normally-open switch in series to form a third branch circuit; the normally open switch of the oil level protection relay, the normally open switch of the oil pressure protection relay and the normally open switch of the temperature protection relay are connected in parallel and then are connected in series with a coil of the transformer fault relay to form a fourth branch circuit;
the first branch circuit, the second branch circuit, the third branch circuit and the fourth branch circuit are all connected between the positive electrode and the negative electrode of a power supply;
the coil of the vacuum circuit breaker, the normally closed switch of the vacuum circuit breaker and the normally closed switch of the transformer fault relay are connected in series to form a fifth branch, the first end of the fifth branch is connected with the positive electrode of the power supply, and the second end of the fifth branch is grounded.
Optionally, the power supply further comprises at least one switch, and the switch is connected between the positive electrode and the negative electrode of the power supply.
According to a second aspect of the embodiments of the present application, there is provided a power supply circuit including the above-mentioned traction transformer fault diagnosis circuit.
The third aspect of the application provides a rail transit vehicle, which comprises the power supply circuit and a vehicle control unit;
and the vehicle control unit is used for monitoring the power supply circuit.
Compared with the prior art, the technical scheme of the application has the advantages that:
through the oil level to the transformer inside, oil pressure and temperature are monitored, when taking place the oil level and be less than the oil level threshold value, when the oil pressure is higher than pressure threshold value and temperature and be higher than one or more trouble in the temperature threshold value trouble, the oil level protection that corresponds normally opens the switch, oil pressure protection normally opens the switch and the oil temperature protection normally opens the switch closure, and then the coil of the relay that corresponds is electrified, under electromagnetic effect's effect, the switch closure of the relay that corresponds, thereby transformer fault relay's coil is electrified, transformer fault relay's normally closed switch disconnection, thereby vacuum circuit breaker's coil loses electricity, vacuum circuit breaker's normally closed switch disconnection, thereby vacuum circuit breaker's normally closed switch place high-voltage circuit is broken off, rail vehicle's security has been improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a fault diagnosis circuit for a traction transformer according to the present invention;
fig. 2 is a schematic diagram of another traction transformer fault diagnosis circuit provided by the present invention;
fig. 3 is a schematic diagram of a fault diagnosis circuit for a traction transformer according to the present invention;
fig. 4 is a schematic structural diagram of a rail transit vehicle according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, the drawing is a schematic diagram of a traction transformer fault diagnosis circuit provided by the present invention.
The oil level protection normally open switch S1, the oil pressure protection normally open switch S2 and the oil temperature protection normally open switch S3 are located inside the traction transformer T.
The traction transformer T determines its own state through the oil level protection normally open switch S1, the oil pressure protection normally open switch S2, and the oil temperature protection normally open switch S3. When the oil level in the traction transformer T is lower than an oil level threshold value, triggering an oil level protection normally-open switch S1 to be closed; when the oil pressure in the traction transformer T is higher than an oil pressure threshold value, triggering an oil pressure protection normally-open switch S2 to be closed; when the temperature inside the traction transformer T is higher than the oil pressure threshold value, the trigger temperature protection normally-open switch S3 is closed.
A coil K1 of the oil level protection relay is connected in series with an oil level protection normally-open switch S1 to form a first branch circuit which is connected between the positive pole of the power supply and the negative pole of the power supply.
A coil K2 of the oil pressure protection relay is connected with an oil pressure protection normally open switch S2 in series to form a second branch circuit which is connected between the positive pole of the power supply and the negative pole of the power supply.
A coil K3 of the temperature protection relay is connected with an oil temperature protection normally-open switch S3 in series to form a third branch circuit which is connected between the positive pole of the power supply and the negative pole of the power supply.
The normally open switch K1-1 of the oil level protection relay, the normally open switch K2-1 of the oil pressure protection relay and the normally open switch K3-1 of the temperature protection relay are connected in parallel and then connected in series with a coil K4 of the transformer fault relay to form a fourth branch circuit, and the fourth branch circuit is connected between the positive pole of the power supply and the negative pole of the power supply.
The first branch circuit, the second branch circuit, the third branch circuit and the fourth branch circuit are connected in parallel.
A coil K5 of the vacuum circuit breaker, a normally closed switch K5-1 of the vacuum circuit breaker and a normally closed switch K4-1 of the transformer fault relay are connected in series to form a fifth branch, the first end of the fifth branch is connected with the positive electrode of a power supply, and the second end of the fifth branch is grounded.
The embodiment of the present application does not specifically limit the connection relationship in the fifth branch, that is, the series relationship between the coil K5 of the vacuum circuit breaker, the normally closed switch K5-1 of the vacuum circuit breaker, and the normally closed switch K4-1 of the transformer fault relay.
For example, as shown in fig. 1, a first end of a normally closed switch K5-1 of the vacuum circuit breaker is connected with a positive electrode of a power supply, and a second end of a normally closed switch K5-1 of the vacuum circuit breaker is connected with a normally closed switch K4-1 of a transformer fault relay and a coil K5 of the vacuum circuit breaker in sequence and finally grounded.
For another example, the first end of the normally closed switch K5-1 of the vacuum circuit breaker is connected to the positive electrode of the power supply, and the second end of the normally closed switch K5-1 of the vacuum circuit breaker is sequentially connected to the coil K5 of the vacuum circuit breaker and the switch K4-1 of the fault relay, and finally grounded.
The voltage of the power supply may be 110V, which is not specifically limited in this application, and it is understood that different voltage levels may be selected according to different types of electric devices.
The working principle of the fault diagnosis circuit for the traction transformer provided by the utility model is explained below.
When the oil level inside the traction transformer T is lower than the oil level threshold value, the oil level protection normally-open switch S1 is triggered to close, so that the coil K1 of the oil level protection relay is powered. And current flows through the coil to generate an electromagnetic effect, under the action of the electromagnetic effect, the armature closes the iron core, the moving contact and the static contact are closed, namely a normally open switch K1-1 of the oil level protection relay is closed, so that the coil K4 of the transformer fault relay is electrified. Similarly, current flows through the coil, so that an electromagnetic effect is generated, under the action of the electromagnetic effect, the armature closes the iron core, the moving contact and the static contact are closed, namely the normally closed switch K4-1 of the transformer fault relay is opened, and the coil K5 of the vacuum circuit breaker is powered off. After the coil is powered off, the electromagnetic attraction force disappears, and the normally closed switch K5-1 of the vacuum circuit breaker is switched off, so that high voltage is switched off, and the safety problem of the railway vehicle caused by the failure of the traction transformer is protected.
Similarly, when the oil pressure in the traction transformer T is higher than the oil pressure threshold value, the oil pressure protection normally-open switch S2 is triggered to be closed, so that the coil K2 of the oil pressure protection relay is electrified. The current flows through the coil, so that an electromagnetic effect is generated, under the action of the electromagnetic effect, the armature closes the iron core, the moving contact and the static contact are closed, namely a normally open switch K2-1 of the oil pressure protection relay is closed, so that the coil K4 of the transformer fault relay is electrified. Similarly, current flows through the coil, so that an electromagnetic effect is generated, under the action of the electromagnetic effect, the armature closes the iron core, the moving contact and the static contact are closed, namely the normally closed switch K4-1 of the transformer fault relay is opened, and the coil K5 of the vacuum circuit breaker is powered off. After the coil is powered off, the electromagnetic attraction force disappears, and the normally closed switch K5-1 of the vacuum circuit breaker is switched off, so that high voltage is switched off, and the safety problem of the railway vehicle caused by the failure of the traction transformer is protected.
When the temperature in the traction transformer T is higher than the temperature threshold value, the oil temperature protection normally-open switch S3 is triggered to be closed, so that the coil K3 of the temperature protection relay is electrified. The current flows through the coil, so that an electromagnetic effect is generated, under the action of the electromagnetic effect, the armature closes the iron core, the moving contact and the static contact are closed, namely a normally open switch K3-1 of the temperature protection relay is closed, so that the coil K4 of the transformer fault relay is electrified. Similarly, current flows through the coil, so that an electromagnetic effect is generated, under the action of the electromagnetic effect, the armature closes the iron core, the moving contact and the static contact are closed, namely the normally closed switch K4-1 of the transformer fault relay is opened, and the coil K5 of the vacuum circuit breaker is powered off. After the coil is powered off, the electromagnetic attraction force disappears, and the normally closed switch K5-1 of the vacuum circuit breaker is disconnected, so that a high-voltage circuit where the normally closed switch of the vacuum circuit breaker is located is disconnected, and the safety of the railway vehicle is improved.
The oil level threshold, the oil pressure threshold and the temperature threshold are not particularly limited in the embodiment of the application, and can be set by a person skilled in the art according to actual needs.
In one possible embodiment, at least one switch may be provided in the traction transformer fault diagnosis circuit, and one switch and two switches may be provided in the traction transformer fault diagnosis circuit described below with reference to fig. 2 and 3, respectively.
Referring to fig. 2, the drawing is a schematic diagram of another traction transformer fault diagnosis circuit provided by the present invention.
The embodiment includes a switch S4, the switch S4 is connected between the positive and negative poles of the power supply, and the traction transformer fault diagnosis circuit functions to protect the traction transformer T when the switch S4 is open.
Referring to fig. 3, the drawing is a schematic diagram of still another traction transformer fault diagnosis circuit provided by the present invention.
The embodiment comprises two switches S4 and S5, wherein the switch S4 is arranged in the branch of the positive pole of the power supply, the switch S5 is arranged in the branch of the negative pole of the switch, and the switch S4 and the switch S5 are connected in series between the positive pole of the power supply and the negative pole of the power supply. The switch S4 and the switch S5 are a pair of switches, and when S4 and S5 are closed at the same time, the traction transformer fault diagnosis circuit functions to protect the traction transformer T.
Through the oil level to the transformer inside, oil pressure and temperature are monitored, when taking place the oil level and be less than the oil level threshold value, when the oil pressure is higher than pressure threshold value and temperature and be higher than one or more trouble in the temperature threshold value trouble, the oil level protection that corresponds normally opens the switch, oil pressure protection normally opens the switch and the oil temperature protection normally opens the switch closure, and then the coil of the relay that corresponds is electrified, under electromagnetic effect's effect, the switch closure of the relay that corresponds, thereby transformer fault relay's coil is electrified, transformer fault relay's normally closed switch disconnection, thereby vacuum circuit breaker's coil loses electricity, vacuum circuit breaker's normally closed switch disconnection, thereby vacuum circuit breaker's normally closed switch place high-voltage circuit is broken off, rail vehicle's security has been improved.
Before any one of the faults is not eliminated, the normally closed switch of the vacuum circuit breaker cannot be closed, a high-voltage circuit where the normally closed switch of the vacuum circuit breaker is located is protected, and the safety of the railway vehicle is improved.
Based on the fault diagnosis circuit for the traction transformer provided by the above embodiment, the embodiment of the present application further provides a power supply circuit, which includes the fault diagnosis circuit for the traction transformer introduced by the above embodiment.
It is understood that the power supply circuit may include a power conversion circuit, that is, an ac power source is converted into a dc power source, that is, a rectification function, in addition to the traction transformer fault diagnosis circuit.
The power supply circuit can be embedded in electric equipment, for example, the electric equipment is a rail transit vehicle, and the electric equipment is embedded in the rail transit vehicle.
The embodiment of the utility model provides a track transportation vehicles is still provided, follows and combines the attached drawing to carry out detailed description.
It should be noted that the rail transit vehicle may be a motor car or a subway.
Referring to fig. 4, this figure is a schematic structural diagram of a rail transit vehicle provided by the embodiment of the present invention.
This rail transit vehicle includes: a vehicle control unit 420, and the aforementioned power supply circuit 410; the vehicle control unit 420 is used for monitoring the power system;
and the power supply circuit 410 is used for detecting the fault of the traction transformer by using the traction transformer fault diagnosis circuit and improving the safety of the rail transit vehicle. The specific implementation manner of the traction transformer fault diagnosis circuit may refer to the description in the above embodiments, and is not described herein again.
The embodiment of the utility model provides a rail transit vehicle car, because including traction transformer fault diagnosis circuit among the supply circuit, traction transformer fault diagnosis circuit has simple structure, characteristics that the reliability is high, when network fault or the unable real time monitoring traction transformer's of network oil level, pressure, temperature information, traction transformer fault diagnosis circuit plays the effect of protection traction transformer as the last measure of traction transformer control to improve rail transit vehicle's security.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention. The invention is not limited to the embodiments described herein, but is capable of other embodiments according to the invention, and may be used in various other applications, including, but not limited to, industrial. Therefore, any simple modification, equivalent change and modification made to the above embodiments by the technical entity of the present invention all still fall within the protection scope of the technical solution of the present invention, where the technical entity does not depart from the content of the technical solution of the present invention.
Claims (4)
1. A traction transformer fault diagnostic circuit, comprising: the oil level protection system comprises a vacuum circuit breaker, an oil level protection relay, an oil pressure protection relay, a temperature protection relay, a transformer fault relay, an oil level protection normally open switch, an oil pressure protection normally open switch and an oil temperature protection normally open switch; the oil level protection normally open switch, the oil pressure protection normally open switch and the oil temperature protection normally open switch are positioned in the traction transformer;
a coil of the oil level protection relay is connected with the oil level protection normally-open switch in series to form a first branch circuit; a coil of the oil pressure protection relay is connected with the oil pressure protection normally open switch in series to form a second branch circuit; a coil of the temperature protection relay is connected with the oil temperature protection normally-open switch in series to form a third branch circuit; the normally open switch of the oil level protection relay, the normally open switch of the oil pressure protection relay and the normally open switch of the temperature protection relay are connected in parallel and then are connected in series with a coil of the transformer fault relay to form a fourth branch circuit;
the first branch circuit, the second branch circuit, the third branch circuit and the fourth branch circuit are all connected between the positive electrode and the negative electrode of a power supply;
the coil of the vacuum circuit breaker, the normally closed switch of the vacuum circuit breaker and the normally closed switch of the transformer fault relay are connected in series to form a fifth branch, the first end of the fifth branch is connected with the positive electrode of the power supply, and the second end of the fifth branch is grounded.
2. The traction transformer fault diagnosis circuit according to claim 1, characterized in that it further comprises at least one switch connected between the positive and negative poles of the power supply.
3. A power supply circuit comprising the traction transformer fault diagnosis circuit according to claim 1 or 2.
4. A rail transit vehicle comprising the power supply circuit of claim 3, and further comprising a vehicle control unit;
and the vehicle control unit is used for monitoring the power supply circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021642133.6U CN212723281U (en) | 2020-08-07 | 2020-08-07 | Traction transformer fault diagnosis circuit, power supply circuit and rail transit vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021642133.6U CN212723281U (en) | 2020-08-07 | 2020-08-07 | Traction transformer fault diagnosis circuit, power supply circuit and rail transit vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN212723281U true CN212723281U (en) | 2021-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021642133.6U Active CN212723281U (en) | 2020-08-07 | 2020-08-07 | Traction transformer fault diagnosis circuit, power supply circuit and rail transit vehicle |
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| Country | Link |
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| CN (1) | CN212723281U (en) |
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- 2020-08-07 CN CN202021642133.6U patent/CN212723281U/en active Active
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