CN111416325A - Transformer heavy gas protection external tripping circuit - Google Patents
Transformer heavy gas protection external tripping circuit Download PDFInfo
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- CN111416325A CN111416325A CN202010235850.5A CN202010235850A CN111416325A CN 111416325 A CN111416325 A CN 111416325A CN 202010235850 A CN202010235850 A CN 202010235850A CN 111416325 A CN111416325 A CN 111416325A
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- protection
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- relay
- heavy gas
- transformer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
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- Protection Of Transformers (AREA)
Abstract
The invention discloses a transformer heavy gas protection external tripping circuit, wherein in the circuit, one end of a normally open contact of a protection tripping outlet relay is connected with the positive electrode of a direct-current power supply, the other end of the normally open contact is connected with one end of a protection tripping pressing plate, the other end of the protection tripping pressing plate is connected with one end of an auxiliary normally open contact of a circuit breaker, the other end of the auxiliary normally open contact of the circuit breaker is connected with one end of a tripping coil, and the other end of the tripping coil is connected with the negative electrode of the direct-current power supply; the gas relay is arranged on the pipelines of the oil tank and the oil conservator of the transformer body, and when the transformer is in internal failure, the contact of the heavy gas relay is closed; one end of the heavy gas relay contact is connected with the positive electrode of the direct-current power supply, and the other end of the heavy gas relay contact is connected with the other end of the protection tripping pressing plate. According to the transformer heavy gas protection external tripping circuit, when the transformer at the user side has an internal fault, the circuit breaker of the upper-level power grid trips to cut off the power supply of the transformer, so that the accident range is prevented from being further expanded, and the safety and reliability of a power supply system are improved.
Description
Technical Field
The invention relates to the technical field of transformer protection control, in particular to a transformer heavy gas protection external tripping circuit.
Background
The transformer is used as important electrical equipment in an electric power system, and can convert alternating current electric energy of one voltage and current into alternating current electric energy of another voltage and current with the same frequency under normal conditions, so that electric energy with proper voltage grade is provided for power consumers. The gas protection is the main protection of the internal faults of the transformer and can effectively reflect the internal faults of the transformer. The gas protection includes light gas protection and heavy gas protection. The light gas protection acts on the signal and the heavy gas acts on the trip. In the prior art, a contact of a transformer gas relay enters a relay protection device through a direct-current power supply wiring, when a short circuit and other faults occur inside a transformer, a normally open contact of the transformer gas relay is switched on, a heavy gas protection circuit of the transformer is switched on, circuit breakers on the high side and the low side of the transformer trip out, and the power supply of the transformer is cut off, so that the accident range is prevented from being enlarged. The regulations stipulate that an oil-immersed transformer above 800kVA needs to be provided with gas protection, but a direct-current power supply or a protection device is not configured on the site of a transformer substation or a distribution room with a small scale, when a fault occurs in the transformer, the gas protection function of the transformer cannot be realized, and a breaker cannot cut off the power supply, so that the fault of the transformer is further aggravated, the accident range is enlarged, and the safety and reliability of a power supply system are influenced.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a transformer heavy gas protection external trip circuit. The specific technical scheme is as follows:
a transformer heavy gas protection external trip circuit comprising: the protection tripping device comprises a direct-current power supply, a protection tripping outlet relay normally-open contact, a protection tripping pressure plate, a breaker auxiliary normally-open contact, a tripping coil, a gas relay and a heavy gas relay contact; one end of the normally open contact of the trip protection outlet relay is connected with the positive electrode of the direct-current power supply, the other end of the normally open contact of the trip protection outlet relay is connected with one end of the trip protection pressing plate, the other end of the trip protection pressing plate is connected with one end of the auxiliary normally open contact of the circuit breaker, the other end of the auxiliary normally open contact of the circuit breaker is connected with one end of the opening coil, and the other end of the opening coil is connected with the negative electrode of the direct-current power supply; the gas relay is arranged on a body oil tank of the user side transformer and a pipeline of the oil conservator and used for closing the contact of the heavy gas relay when the transformer fails; one end of the heavy gas relay contact is connected with the positive electrode of the direct-current power supply, and the other end of the heavy gas relay contact is connected with the other end of the protection tripping pressing plate; the breaker auxiliary normally open contact is in a closed state when the breaker is switched on, and the normally open contact of the trip protection outlet relay is closed when an external line and equipment have short circuit faults.
In one possible design, the circuit further includes a trip hold relay coil and its self-holding contacts; the tripping holding relay coil is connected in series between the protection tripping pressing plate and the auxiliary normally open contact of the circuit breaker; one end of the trip holding relay self-holding contact is connected with the positive electrode of the direct-current power supply, and the other end of the trip holding relay self-holding contact is connected with the common ends of the trip protection pressing plate and the trip holding relay coil.
In one possible design, the heavy buchholz relay contact is wired to a control terminal block in a feeder-out switchgear of the upper-level substation.
In a possible design, protection tripping operation export relay normally open contact protection tripping operation clamp plate the supplementary normally open contact of circuit breaker the separating brake coil tripping operation holding relay self-sustaining contact all belongs to the inside components and parts of computer protection measurement and control device, heavy buchholz relay contact passes through control binding post arranges the wiring extremely in the computer protection measurement and control device internal circuit.
In a possible design, the microcomputer protection measurement and control device is connected with the background monitoring microcomputer through a communication cable and used for feeding back the action of the heavy gas relay contact to the background monitoring microcomputer.
In one possible design, the background monitoring microcomputer sends trip alarm information when the heavy gas relay contact is closed.
In one possible design, a dc circuit breaker is provided at the dc power source.
In one possible design, the voltage of the dc power supply is 220V.
The technical scheme of the invention has the following main advantages:
according to the heavy gas protection tripping circuit of the transformer, by arranging the gas relay and the heavy gas relay contact, when the transformer at the user side has internal faults (such as turn-to-turn and interlayer short circuits, iron core faults, internal faults of a sleeve, internal disconnection of a winding, insulation degradation, oil level reduction and other faults), the heavy gas relay contact is closed, a control circuit of a power grid circuit breaker of an upper-level transformer substation is switched on, a switching-off coil is electrified, the circuit breaker is tripped in a protection mode, the power supply of the transformer is cut off, the accident range is prevented from being further expanded, and the safety and reliability of a power supply system are improved. And the original protection circuit of the power grid circuit breaker of the upper-level transformer substation is utilized, the existing resources are fully utilized, the structure is simplified, and the integration degree is higher.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and 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 and not to limit the invention. In the drawings:
fig. 1 is a diagram illustrating a transformer heavy gas protection external trip circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is described in detail below with reference to the accompanying drawings.
The embodiment of the invention provides a transformer heavy gas protection external trip circuit which comprises a direct-current power supply KM, a protection trip outlet relay normally-open contact BTJ, a protection trip pressing plate L P1, a breaker auxiliary normally-open contact QF, a tripping coil TQ, a gas relay and a heavy gas relay contact WSJ, wherein one end of the protection trip outlet relay normally-open contact BTJ is connected with a positive electrode + KM of the direct-current power supply, the other end of the protection trip outlet relay normally-open contact BTJ is connected with one end of a protection trip pressing plate L P1, the other end of the protection trip pressing plate L P1 is connected with one end of the breaker auxiliary normally-open contact QF, the other end of the breaker auxiliary normally-open contact QF is connected with one end of the tripping coil TQ, the other end of the tripping coil TQ is connected with a negative electrode-KM of the direct-current power supply, the gas relay is arranged on a body oil tank of a user-side transformer and an oil conservator pipeline and used for closing the heavy gas relay contact WSJ when a transformer fault occurs, one end of the protection trip pressing plate L is connected with a short-open contact of the external trip relay, and the heavy gas relay is in a short-open circuit when a short-open fault occurs, and the.
The working principle of the transformer heavy gas protection external trip circuit provided by the embodiment of the invention is explained as follows:
in the circuit, a direct current power supply KM, a protection tripping outlet relay normally open contact BTJ, a protection tripping pressing plate L P1, a breaker auxiliary normally open contact QF and a tripping coil TQ form a breaker protection tripping loop, when the breaker is switched on, the breaker auxiliary normally open contact QF is in a closed state, when an external line or equipment is short-circuited, the protection tripping outlet relay normally open contact BTJ is closed, the protection tripping pressing plate L P1, a loop where the breaker auxiliary normally open contact QF and the tripping coil TQ are located is communicated with the direct current power supply KM, the tripping coil TQ is electrified, an operation mechanism is driven, breaker protection tripping is completed, on the basis of the protection tripping loop, a user side transformer heavy gas relay contact WSJ is connected with the breaker protection tripping loop through connecting the user side transformer heavy gas relay contact WSJ, the tripping coil TQ is connected, when the transformer has an internal fault, the heavy gas relay contact WSJ of the gas relay is closed, the heavy gas relay contact WSJ, the breaker auxiliary normally open contact QF and the breaker is connected with the direct current power supply loop KM, the protection tripping pressing plate 1 is closed, and the protection tripping pressing plate can be used for controlling the protection tripping under the protection circuit.
Therefore, according to the heavy gas protection tripping circuit of the transformer, which is provided by the embodiment of the invention, by arranging the gas relay and the heavy gas relay contact WSJ, when the transformer at a user side has internal faults (such as turn-to-turn and interlayer short circuits, iron core faults, sleeve internal faults, winding internal disconnection, insulation degradation, oil level reduction and other faults), the heavy gas relay contact WSJ is closed, the opening coil TQ is electrified, the breaker is used for protecting tripping, the power supply of the transformer is cut off, the accident range is further expanded, and the safety and reliability of a power supply system are improved. And the original protection circuit of the circuit breaker is utilized, the existing resources are fully utilized, the structure is simplified, and the integration degree is higher.
Further, the transformer heavy gas protection external trip circuit provided by the embodiment of the invention further comprises a trip keeping relay coil TBJ and a self-keeping contact thereof, wherein the trip keeping relay coil TBJ is connected between the protection trip pressing plate L P1 and the breaker auxiliary normally open contact QF in series, one end of the trip keeping relay self-keeping contact TBJ1 is connected with the positive electrode + KM of the direct current power supply, and the other end is connected with the common end of the protection trip pressing plate L P1 and the trip keeping relay coil TBJ.
In the embodiment of the invention, a heavy gas relay contact WSJ is connected to a control terminal block in a feed-out switch cabinet of a transformer substation, specifically, a normally open contact BTJ of a protection trip outlet relay, a protection trip pressing plate L P1, an auxiliary normally open contact QF of a breaker, a separating coil TQ, a trip keeping relay coil TBJ and a self-keeping contact TBJ1 of a trip keeping relay belong to internal components of a microcomputer protection measurement and control device, the heavy gas relay contact WSJ is connected to an internal circuit of the microcomputer protection measurement and control device through the control terminal block, as shown in the attached figure 1, the control terminal block in the feed-out switch cabinet has the terminal numbers of I/93 and I/94, and is respectively connected to a pair of protection action passive idle output contacts of the microcomputer protection measurement and control device through leads, namely a terminal 1nB4, a terminal 1nB 5.1nB 4 and a terminal 5 of the microcomputer protection measurement and control device, and a terminal block 4, a terminal block 3, a terminal block 5 and a terminal block 8 are respectively electrically connected in the microcomputer protection measurement and control device.
Generally, the distance between the user-side transformer and the upper-level substation power grid is not too far. And a control cable between the heavy gas relay contact WSJ and the upper-stage substation power grid feed-out switch cabinet can be laid in the cable trench. For example, it can be laid in the same cable trench as the high-voltage power supply cable and effectively isolated.
Further, in order to facilitate monitoring of the heavy gas protection action condition of the transformer, the microcomputer protection measurement and control device is connected with the background monitoring microcomputer through a communication cable and used for feeding back action information of the heavy gas relay contact WSJ to the background monitoring microcomputer, and the background monitoring microcomputer sends alarm information when the heavy gas relay contact WSJ is closed. The name and the number of the protection information of the heavy gas protection action are respectively defined in a background monitoring microcomputer. The alarm signal on the background monitoring microcomputer can be set to be light alarm, sound alarm or acousto-optic alarm. In order to facilitate reminding of background personnel, the displayed subtitles may appear in a blinking manner.
Furthermore, the microcomputer protection measurement and control device and the background monitoring microcomputer are connected with a communication management machine, and information collected by each microcomputer protection measurement and control device can be gathered and processed through the communication management machine and then is transmitted to the background monitoring microcomputer through communication. The on-line display and alarm of the alarm information of the transformer heavy gas protection fault on a background monitoring microcomputer are realized.
Further, in the transformer heavy gas protection external trip circuit provided by the embodiment of the invention, the direct current breaker 1DK is arranged at the direct current power supply KM, so that whether the direct current power supply KM supplies power normally or not is conveniently controlled.
Alternatively, the voltage of the dc power supply KM may be 220V.
In summary, in the external trip circuit for heavy gas protection of the transformer provided by the embodiment of the present invention, the WSJ contact of the heavy gas relay contact of the transformer on the user side is connected to the control terminal row in the outgoing feeder switch cabinet of the upper-level transformer substation, and finally connected to the internal circuit of the microcomputer protection measurement and control device of the cabinet. Like this, when transformer emergence internal fault, buchholz relay's heavy buchholz relay contact WSJ is closed, and heavy buchholz relay contact WSJ, tripping operation keep relay coil TBJ, the supplementary normally open contact QF of circuit breaker and separating brake coil TQ and DC power supply KM return circuit switch-on, separating brake coil TQ gets electric, and the circuit breaker protection tripping operation cuts off the transformer power supply, avoids the accident scope further to enlarge, improves power supply system fail safe nature. The original protection circuit of the power grid circuit breaker of the upper-level transformer substation is utilized, the existing resources are fully utilized, the structure is simplified, and the integration degree is high. And fault information can be acquired in time through the background monitoring microcomputer.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. In addition, "front", "rear", "left", "right", "upper" and "lower" in this document are referred to the placement states shown in the drawings.
Finally, it should be noted that: the above examples are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A transformer heavy gas protection external trip circuit, characterized by, includes: the protection tripping device comprises a direct-current power supply, a protection tripping outlet relay normally-open contact, a protection tripping pressure plate, a breaker auxiliary normally-open contact, a tripping coil, a gas relay and a heavy gas relay contact;
one end of the normally open contact of the trip protection outlet relay is connected with the positive electrode of the direct-current power supply, the other end of the normally open contact of the trip protection outlet relay is connected with one end of the trip protection pressing plate, the other end of the trip protection pressing plate is connected with one end of the auxiliary normally open contact of the circuit breaker, the other end of the auxiliary normally open contact of the circuit breaker is connected with one end of the opening coil, and the other end of the opening coil is connected with the negative electrode of the direct-current power supply;
the gas relay is arranged on a body oil tank of the user side transformer and a pipeline of the oil conservator and used for closing the contact of the heavy gas relay when the transformer fails;
one end of the heavy gas relay contact is connected with the positive electrode of the direct-current power supply, and the other end of the heavy gas relay contact is connected with the other end of the protection tripping pressing plate;
the breaker auxiliary normally open contact is in a closed state under the working state of the breaker, and the normally open contact of the trip protection outlet relay is closed when an external line and equipment have short circuit faults.
2. The transformer reshuffling protection external trip circuit according to claim 1, characterized in that it further comprises a trip hold relay coil and its self-holding contacts;
the tripping holding relay coil is connected in series between the protection tripping pressing plate and the auxiliary normally open contact of the circuit breaker;
one end of the trip holding relay self-holding contact is connected with the positive electrode of the direct-current power supply, and the other end of the trip holding relay self-holding contact is connected with the common ends of the trip protection pressing plate and the trip holding relay coil.
3. The transformer heavy gas protection external trip circuit of claim 2, wherein the heavy gas relay contacts are wired to a control terminal bank within a feeder-out switchgear of a substation.
4. The transformer heavy gas protection external trip circuit according to claim 3, wherein the protection trip outlet relay normally open contact, the protection trip pressing plate, the breaker auxiliary normally open contact, the opening coil, the trip holding relay coil and the trip holding relay self-holding contact all belong to microcomputer protection measurement and control device internal components, and the heavy gas relay contact is wired into the microcomputer protection measurement and control device internal circuit through the control wiring terminal row.
5. The transformer heavy gas protection external trip circuit according to claim 4, wherein the microcomputer protection measurement and control device is connected with a background monitoring microcomputer through a communication cable, and is used for feeding back the action of the heavy gas relay contact to the background monitoring microcomputer.
6. The transformer heavy gas protection external trip circuit of claim 5, wherein the background monitoring microcomputer sends a trip alarm message when the heavy gas relay contact is closed.
7. The transformer heavy gas protection external trip circuit of claim 1, wherein a dc breaker is provided at the dc power source.
8. The transformer heavy gas protection trip circuit of claim 1, wherein the voltage of the direct current power supply is 220V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010235850.5A CN111416325A (en) | 2020-03-30 | 2020-03-30 | Transformer heavy gas protection external tripping circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010235850.5A CN111416325A (en) | 2020-03-30 | 2020-03-30 | Transformer heavy gas protection external tripping circuit |
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| Publication Number | Publication Date |
|---|---|
| CN111416325A true CN111416325A (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010235850.5A Pending CN111416325A (en) | 2020-03-30 | 2020-03-30 | Transformer heavy gas protection external tripping circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112967904A (en) * | 2021-01-18 | 2021-06-15 | 国网宁夏电力有限公司检修公司 | Wiring structure of gas relay for converter transformer and signal output method |
-
2020
- 2020-03-30 CN CN202010235850.5A patent/CN111416325A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112967904A (en) * | 2021-01-18 | 2021-06-15 | 国网宁夏电力有限公司检修公司 | Wiring structure of gas relay for converter transformer and signal output method |
| CN112967904B (en) * | 2021-01-18 | 2024-09-24 | 国网宁夏电力有限公司检修公司 | Wiring structure and signal output method of gas relay for converter transformer |
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