CN211720258U - Transformer heavy gas protection external tripping circuit - Google Patents
Transformer heavy gas protection external tripping circuit Download PDFInfo
- Publication number
- CN211720258U CN211720258U CN202020438700.XU CN202020438700U CN211720258U CN 211720258 U CN211720258 U CN 211720258U CN 202020438700 U CN202020438700 U CN 202020438700U CN 211720258 U CN211720258 U CN 211720258U
- Authority
- CN
- China
- Prior art keywords
- protection
- relay
- trip
- transformer
- contact
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Protection Of Transformers (AREA)
Abstract
The utility model discloses a transformer heavy gas protection external tripping circuit, in the circuit, one end of the normally open contact of the protection tripping outlet relay is connected with the positive pole of the direct current power supply, the other end is connected with one end of the protection tripping pressing plate, the other end of the protection tripping pressing plate is connected with one end of the auxiliary normally open contact of the breaker, the other end of the auxiliary normally open contact of the breaker is connected with one end of the opening coil, and the other end of the opening coil is connected with the negative pole 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. The utility model discloses a transformer heavily gas protection outside trip circuit, when user side transformer takes place internal fault, higher level's electric wire netting circuit breaker tripping operation cuts off the transformer power supply, avoids the accident scope to enlarge, improves power supply system fail safe nature.
Description
Technical Field
The utility model relates to a transformer protection control technical field especially relates to a transformer heavily gas protects outside trip 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.
SUMMERY OF THE UTILITY MODEL
For the technical problem who exists among the above-mentioned prior art of solution, the utility model provides a transformer heavily gas protection outside 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 utility model discloses technical scheme's main advantage as follows:
the utility model discloses a transformer heavily gas protection tripping circuit, through setting up buchholz relay and heavy buchholz relay contact, when user's side transformer takes place internal failure (like interturn and interlaminar short circuit, the iron core trouble, the inside trouble of sleeve pipe, the inside broken string of winding and insulating degradation and oil level decline etc. trouble), heavy buchholz relay contact is closed, the control circuit of last one-level transformer substation electric wire netting circuit breaker has been put through, the separating brake coil is got electric, the tripping operation is protected to the circuit breaker, cut off the transformer power supply, avoid the accident scope further to enlarge, improve power supply system fail safe nature. 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 set forth herein, serve to provide a further understanding of the embodiments of the present invention and constitute a part of this specification, and the exemplary embodiments and descriptions thereof are illustrative of the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 is an external trip circuit for protecting heavy gas of a transformer according to an embodiment of the present invention.
Detailed Description
To make the purpose, technical solution and advantages of the present invention clearer, the following will combine the embodiments of the present invention and the corresponding drawings to clearly and completely describe the technical solution of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
The technical solution provided by the embodiments of the present invention is described in detail below with reference to the accompanying drawings.
The embodiment of the utility model provides a transformer heavy gas protection outside trip circuit, as shown in figure 1, include: the protection tripping device comprises a direct-current power supply KM, a protection tripping outlet relay normally-open contact BTJ, a protection tripping pressing plate LP1, a breaker auxiliary normally-open contact QF, a tripping coil TQ, a gas relay and a heavy gas relay contact WSJ; one end of a normally open contact BTJ of the protection tripping outlet relay is connected with the positive electrode + KM of the direct-current power supply, the other end of the normally open contact BTJ is connected with one end of a protection tripping pressing plate LP1, the other end of the protection tripping pressing plate LP1 is connected with one end of an auxiliary normally open contact QF of the breaker, the other end of the auxiliary normally open contact QF of the breaker is connected with one end of a tripping coil TQ, and the other end of the tripping coil TQ is connected with the negative electrode-KM of the direct-current power; 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 a heavy gas relay contact WSJ when the transformer fails; one end of a heavy gas relay contact WSJ is connected with the positive electrode + KM of a direct-current power supply, and the other end of the heavy gas relay contact WSJ is connected with the other end of the protection tripping pressure plate LP 1; the auxiliary normally open contact QF of the breaker is in a closed state when the breaker is switched on, and the normally open contact BTJ of the trip protection outlet relay is closed when an external circuit and equipment have short-circuit faults.
The following is right the embodiment of the utility model provides a transformer heavy gas protection outside trip circuit's theory of operation explains:
in the circuit, a direct-current power supply KM, a protection tripping outlet relay normally-open contact BTJ, a protection tripping pressing plate LP1, a breaker auxiliary normally-open contact QF and a brake separating coil TQ form a breaker protection tripping loop. When the breaker is switched on, the auxiliary normally open contact QF of the breaker is in a closed state. When external line or equipment take place the short circuit, protection tripping outlet relay normally open contact BTJ is closed, makes protection tripping outlet relay normally open contact BTJ, protection tripping pressure plate LP1, the supplementary return circuit that normally open contact QF and separating brake coil TQ place of circuit breaker communicate with DC power supply KM, and separating brake coil TQ gets electric, drives operating device, accomplishes the circuit breaker protection tripping operation. On the basis of the protection tripping loop, a user side transformer heavy gas relay contact WSJ contact is wired into the breaker protection tripping loop. Like this, when transformer internal failure took place, buchholz relay's heavy buchholz relay contact WSJ is closed, and heavy buchholz relay contact WSJ, the supplementary normally open contact QF of circuit breaker and separating brake coil TQ and direct current power supply KM return circuit switch-on, separating brake coil TQ receive the electricity, and the circuit breaker protection tripping operation cuts off the transformer power supply. The protection trip pressure plate LP1 can be closed or opened under human control to facilitate control of whether the protection trip circuit is in use or not in the circuit.
It can be seen, the embodiment of the utility model provides a transformer heavily gas protection tripping circuit, through setting up buchholz relay and heavy buchholz relay contact WSJ, when user's side transformer takes place internal failure (like turn-to-turn and interlaminar short circuit, the iron core trouble, the internal fault of sleeve pipe, the inside broken string of winding and insulating degradation and oil level decline etc. trouble), heavy buchholz relay contact WSJ is closed, separating brake coil TQ is electrified, the tripping operation is protected to the circuit breaker, cut off the transformer power supply, avoid accident range further to expand, improve power supply system fail safe nature. 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.
Furthermore, the transformer heavy gas protection external trip circuit provided by the embodiment of the invention also comprises a trip holding relay coil TBJ and a self-holding contact thereof; the trip hold relay coil TBJ is connected in series between the protective trip pressure plate LP1 and the breaker auxiliary normally open contact QF; one end of the trip hold relay latching contact TBJ1 is connected to the positive terminal + KM of the dc power supply, and the other end is connected to the common terminal of the protective trip pressure plate LP1 and the trip hold relay coil TBJ. With such an arrangement, on the one hand, when the trip holding relay coil TBJ is powered on, the trip holding relay self-holding contact TBJ1 is closed, so that the situation that the tripping coil TQ is not correctly and reliably operated due to the fact that the tripping contact in normal tripping operation is short in turn-on time or returns too fast or the tripping operation is performed in a short-circuit accident, and the tripping outlet relay normally-open contact BTJ is shaken and closed insufficiently can be prevented. On the other hand, when the trip hold relay coil TBJ is energized after the heavy buchholz relay contact WSJ is closed, the trip hold relay self-hold contact TBJ1 is closed to ensure that the opening coil TQ is fully energized before the circuit breaker trips. The tripping coil TQ is connected with the direct-current power supply KM through the tripping holding relay self-holding contact TBJ1, so that the reliability of normal tripping and tripping protection of the circuit breaker is improved.
The embodiment of the utility model provides an in, heavy buchholz relay contact WSJ wiring is arranged to the control binding post in the switch cabinet of being presented of transformer substation. Specifically, a normally open contact BTJ of the trip protection outlet relay, a trip protection pressing plate LP1, an auxiliary normally open contact QF of the breaker, a tripping coil TQ, a trip holding relay coil TBJ and a trip holding relay self-holding contact TBJ1 all belong to internal components of the microcomputer protection measurement and control device, and a heavy gas relay contact WSJ is connected into an internal circuit of the microcomputer protection measurement and control device through a control terminal row. As shown in the attached figure 1, the control wiring terminal rows in the feed-out switch cabinet have the terminal numbers of I/93 and I/94, and are respectively connected to the wiring terminals 1nB4 and 1nB5 of the microcomputer protection measurement and control device of the cabinet through wires. 1nB4 and 1nB5 are a pair of passive idle output contacts of the protection action of the microcomputer protection measurement and control device. And 1nB4 and 1nC3, 1nB5 and 1nC8 are electrically connected in the microcomputer protection measurement and control device respectively.
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, the embodiment of the utility model provides an among the transformer heavy gas protection outside tripping circuit, direct current power supply KM department is provided with direct current circuit breaker 1DK, is convenient for control direct current power supply KM and normally supplies power.
Alternatively, the voltage of the dc power supply KM may be 220V.
To sum up, the embodiment of the utility model provides a transformer heavily gas protection outside trip circuit, through with user side transformer heavily gas relay contact WSJ connection wiring to the last level transformer station present the control binding post row in the cubical switchboard of being qualified for the next round of competitions, wiring to this cabinet computer protection measurement and control device internal circuit at last. 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 embodiments are only used for illustrating the technical solution 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 should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
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 external 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 |
|---|---|---|---|
| CN202020438700.XU CN211720258U (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 |
|---|---|---|---|
| CN202020438700.XU CN211720258U (en) | 2020-03-30 | 2020-03-30 | Transformer heavy gas protection external tripping circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211720258U true CN211720258U (en) | 2020-10-20 |
Family
ID=72834948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020438700.XU Active CN211720258U (en) | 2020-03-30 | 2020-03-30 | Transformer heavy gas protection external tripping circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211720258U (en) |
-
2020
- 2020-03-30 CN CN202020438700.XU patent/CN211720258U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102439811B (en) | A protection system for an it electrical distribution system having a floating reference conductor | |
| CN108183462A (en) | For the electric protective device and electrical equipment of electrical equipment | |
| CN203242926U (en) | Low-voltage power distribution cabinet with residual current protection function | |
| CN211720258U (en) | Transformer heavy gas protection external tripping circuit | |
| CN202817567U (en) | Intelligent box-type wind power substation | |
| CN1350352A (en) | Leakage protection plug | |
| CN209946326U (en) | Breaker opening electric loop fault monitoring system | |
| CN209561923U (en) | Intelligent railway weak electric system power lightning protection distribution device | |
| CN111416325A (en) | Transformer heavy gas protection external tripping circuit | |
| CN205646810U (en) | Well high voltage electric network arc extinction protection device | |
| CN101179169A (en) | Refrigerator with creepage protection function | |
| KR840001584B1 (en) | Wireless emergency power interrupting system for multibranch circuits | |
| CN107026424A (en) | A kind of distribution low-voltage master switch automatic time delay closing device | |
| CN109802377A (en) | A kind of transfevent ground connection arc-extinction device | |
| CN217563306U (en) | Overcurrent protection device of electromagnetic voltage transformer | |
| CN100442617C (en) | Human body electrification protecting method and apparatus for small current system | |
| CN201130851Y (en) | Automatic safety device for low-voltage drawer switch cabinet | |
| CN110504756A (en) | A kind of ring network cabinet protective device control system | |
| CN213364928U (en) | Alarm device for monitoring earth fault and accident trip of transformer substation | |
| CN217159267U (en) | 10KV PT cabinet breakdown safety state feedback circuit | |
| CN218648573U (en) | Intelligent switch system of power distribution network | |
| CN214478574U (en) | Anti-islanding device | |
| CN202455299U (en) | Motor control device of high pressure oil delivery pump | |
| CN211629854U (en) | Circuit breaker protection trip circuit | |
| CN215185178U (en) | Wire inlet cabinet of distribution room |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |