CN209358237U - Main transformer body grave gas protects circuit - Google Patents
Main transformer body grave gas protects circuit Download PDFInfo
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- CN209358237U CN209358237U CN201920239154.4U CN201920239154U CN209358237U CN 209358237 U CN209358237 U CN 209358237U CN 201920239154 U CN201920239154 U CN 201920239154U CN 209358237 U CN209358237 U CN 209358237U
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- relay
- branch
- circuit breaker
- breaker trip
- grave gas
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Abstract
The utility model discloses a kind of main transformer body grave gas to protect circuit, and in the circuit, Buchholz relay electric contact includes concatenated two electric contacts.Buchholz relay electric contact and the series connection of grave gas relay coil are used as the first branch, grave gas relay normally open contact and the series connection of circuit breaker trip exit relay coil are used as second branch, first circuit breaker trip exit relay normal opened contact, first circuit breaker trip guard relay coil, first breaker assists normal opened contact and the series connection of the first breaking coil to be used as third branch, second circuit breaker trip exit relay normal opened contact, second circuit breaker trip guard relay coil, second breaker assists normal opened contact and the series connection of the second breaking coil to be used as the 4th branch, the first branch, second branch, third branch and the 4th branch are in parallel with DC power supply.The main transformer body grave gas of the utility model protects circuit, and two electric contacts are closed ability triggering following trip operation, and high reliablity avoids the occurrence of malfunction.
Description
Technical field
The utility model relates to tranformer protection technical fields more particularly to main transformer body grave gas to protect circuit.
Background technique
Main transformer, abbreviation main transformer (GSU) are the total downconverters for being mainly used for power transmission and transformation in a unit or substation
The core of device and substation.Protection is the main protection of main transformer, can effectively reflect power transformer interior fault.Gas
Protection includes that light gas protecting and grave gas are protected.Light gas protecting acts on signal, and grave gas acts on tripping.
The Buchholz relay in grave gas protection that the prior art provides uses two pairs of normal opened contacts used in parallel, or
A pair of of normal opened contact uses, and another pair normal opened contact is spare.When transformer breaks down, Transformer Heavy Gas relay it is normally opened
Contact, circuit breaker trip, disconnecting transformer power supply, to prevent safety accident.
The existing technology has at least the following problems for designer's discovery: when external short-circuit failure near region occurs for transformer, wearing
More property short circuit current is larger, winding temperature rapid increase, makes the volume expansion of oil, and the oil stream speed between oil clearance is accelerated, and works as oil clearance
When the pressure difference generated on the outside of interior and winding changes greatly, grave gas protects possible malfunction, causes breaker mistrip power loss, influences
Power supply reliability.
Utility model content
To solve above-mentioned the technical problems existing in the prior art, the utility model provides a kind of main transformer body grave gas
Protect circuit.Specific technical solution is as follows:
A kind of main transformer body grave gas protection circuit, comprising: DC power supply, Buchholz relay electric contact, Microcomputer Protection are surveyed
Control device, the first breaker auxiliary normal opened contact, the second breaker auxiliary normal opened contact, the first breaking coil and the second tripping line
Circle；The Buchholz relay electric contact includes concatenated two electric contacts；The microcomputer protecting controller include grave gas after
Electric apparatus coil, grave gas relay normally open contact, circuit breaker trip exit relay coil, the first circuit breaker trip export relay
Device normal opened contact, the second circuit breaker trip exit relay normal opened contact, the first circuit breaker trip guard relay coil and
Two circuit breaker trip guard relay coils, when the grave gas relay coil obtains electric, the grave gas relay normally open is connect
Point closure, when the circuit breaker trip exit relay coil obtains electric, the first circuit breaker trip exit relay is normally opened to be connect
Point and the second circuit breaker trip exit relay normal opened contact closure；The Buchholz relay electric contact and the grave gas
Relay coil series connection is used as the first branch, the grave gas relay normally open contact and the circuit breaker trip exit relay
Coil series connection is used as second branch, the first circuit breaker trip exit relay normal opened contact, first circuit breaker trip
Guard relay coil, first breaker auxiliary normal opened contact and first breaking coil series connection are used as third branch,
The second circuit breaker trip exit relay normal opened contact, the second circuit breaker trip guard relay coil, described
Two breakers assist normal opened contact and second breaking coil series connection to be used as the 4th branch, the first branch, described second
Branch, the third branch and the 4th branch are in parallel with the DC power supply.
In a kind of possible design, the first tripping is in series in the second branch in flakes.
In a kind of possible design, the third branch road is in series with the second tripping in flakes.
In a kind of possible design, the 4th road is in series with third tripping in flakes.
In a kind of possible design, the Buchholz relay electric contact is QYJ1-80 type Buchholz relay or QJ-80 type
The electric contact of Buchholz relay.
The major advantage of technical solutions of the utility model is as follows:
When inside transformer generation catastrophe failure may be implemented in the main transformer body grave gas protection circuit of the utility model, break
The tripping of road device, disconnecting transformer power supply.And Buchholz relay electric contact includes concatenated two electric contacts, two electric contacts are simultaneously
Closure ability triggering following trip operation, stability and safety are higher, avoid the occurrence of nonaction.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the utility model embodiment, constitutes the utility model
A part, the exemplary embodiment of the utility model and the description thereof are used to explain the utility model, does not constitute to this is practical
Novel improper restriction.In the accompanying drawings:
Fig. 1 is the circuit diagram that the main transformer body grave gas that the utility model one embodiment provides protects circuit.
Specific embodiment
It is specific below in conjunction with the utility model to keep the purpose of this utility model, technical solution and advantage clearer
Technical solutions of the utility model are clearly and completely described in embodiment and corresponding attached drawing.Obviously, described embodiment
It is only a part of the embodiment of the utility model, instead of all the embodiments.Based on the embodiments of the present invention, this field
Those of ordinary skill's every other embodiment obtained without making creative work, belongs to the utility model
The range of protection.
Below in conjunction with attached drawing, technical solution provided by the embodiment of the utility model is described in detail.
The utility model embodiment provides a kind of main transformer body grave gas protection circuit, as shown in Fig. 1, protection electricity
Road include: DC power supply, Buchholz relay electric contact, microcomputer protecting controller, the first breaker auxiliary normal opened contact QF1,
Second breaker assists normal opened contact QF2, the first breaking coil TQ1 and the second breaking coil TQ2.Buchholz relay electric contact packet
Include concatenated two electric contacts.Microcomputer protecting controller includes grave gas relay coil J, grave gas relay normally open contact
J1, circuit breaker trip go out relay coil TJ, the normally opened point of interface TJ1 of the first circuit breaker trip exit relay, the second breaker
Trip exit relay normal opened contact TJ2, the first circuit breaker trip guard relay coil TBJ1 and the second circuit breaker trip guarantor
Relay coil TBJ2 is held, when grave gas relay coil J obtains electric, grave gas relay normally open contact J1 closure, breaker is jumped
When lock exit relay coil TJ obtains electric, the first circuit breaker trip exit relay normal opened contact TJ1 and the second circuit breaker trip
Exit relay normal opened contact TJ2 closure.Buchholz relay electric contact and grave gas relay coil J series connection are used as first
Road, grave gas relay normally open contact J1 and circuit breaker trip exit relay coil TJ series connection are used as second branch, and first is disconnected
Road device tripping exit relay normal opened contact TJ1, the first circuit breaker trip guard relay coil TBJ1, the first breaker auxiliary
Normal opened contact QF1 and the first breaking coil TQ1 series connection is used as third branch, the second circuit breaker trip exit relay normal opened contact
TJ2, the second circuit breaker trip guard relay coil TBJ2, the second breaker auxiliary normal opened contact QF2 and the second breaking coil
TQ2 series connection is used as the 4th branch, and the first branch, second branch, third branch and the 4th branch are in parallel with DC power supply.
The working principle of main transformer body grave gas provided by the embodiment of the utility model protection circuit is illustrated below:
First breaker assists normal opened contact QF1 and the second breaker auxiliary normal opened contact QF2 in transformer and high-voltage electricity
In closed state when source is connected to normal work with workload.When oil tank of transformer internal fault to predeterminable level, gas after
Two electric contacts of electric appliance electric contact are closed, and grave gas relay coil J obtains electric.Grave gas relay coil J obtain it is electric after, weight watt
This relay normally open contact J1 closure, circuit breaker trip exit relay coil TJ obtains electric.Circuit breaker trip exit relay line
Circle TJ obtain it is electric after, the first circuit breaker trip exit relay normal opened contact TJ1 closure, the first circuit breaker trip guard relay line
Circle TBJ1 and the first breaking coil TQ1 obtains electric, trip(ping) circuit connection, circuit breaker operation mechanism movement, main transformer high-pressure side breaker
Tripping.At the same time, circuit breaker trip exit relay coil TJ obtain it is electric after, the second circuit breaker trip exit relay is normally opened to be connect
Point TJ2 closure, the second circuit breaker trip guard relay coil TBJ2 and the second breaking coil TQ2 obtain electric, trip(ping) circuit connection,
Circuit breaker operation mechanism movement, main transformer low-pressure side circuit breaker trip.
As it can be seen that by the above process, main transformer body grave gas protection circuit provided by the embodiment of the utility model can be real
When catastrophe failure occurs for existing inside transformer, circuit breaker trip, disconnecting transformer power supply.And Buchholz relay electric contact includes two
A concatenated electric contact, two electric contacts are closed at ability triggering following trip operation, and stability and safety are higher, avoid
There is nonaction.
Wherein, DC power supply can be 220V voltage, convenient for obtaining.
Optionally, the first tripping LP1 in flakes is in series in second branch, third branch road is in series with the second tripping in flakes
LP2, the 4th road are in series with third tripping LP3 in flakes.When main transformer body grave gas protects circuit normal operation, the first tripping
LP3 is in closed communicating state in flakes for LP2 and third tripping in flakes for LP1, the second tripping in flakes.It puts into operation in new main transformer, modify greatly
When making power transmission when putting into operation, protective plug-in unit replacement, refueling, by the first tripping piece in flakes, the second tripping LP2 and third in flakes
LP3 is opened in flakes for tripping, and main transformer body grave gas protection circuit enters off working state, improves security performance, and be avoided that not
The generation of necessary tripping fault.
In the utility model embodiment, Buchholz relay electric contact is QYJ1-80 type Buchholz relay or QJ-80 type gas
The electric contact of relay.The Buchholz relay of two kinds of models is double jump lock, dual signal Buchholz relay, and can satisfy to use needs
It asks.The connection relationship of Buchholz relay the first electric contact WSJ1 and the second electric contact of Buchholz relay WSJ2 may refer to attached drawing 1.
It should be noted that, in this document, the relational terms of such as " first " and " second " or the like are used merely to one
A entity or operation with another entity or operate distinguish, without necessarily requiring or implying these entities or operation it
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to
Cover non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or setting
Standby intrinsic element.In addition, placement shape of "front", "rear", "left", "right", "upper", the "lower" herein to be indicated in attached drawing
State is reference.
Finally, it should be noted that above embodiments are merely to illustrate the technical solution of the utility model, rather than its limitations；
Although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that:
It is still possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is carried out etc.
With replacement；And these are modified or replaceed, various embodiments of the utility model technology that it does not separate the essence of the corresponding technical solution
The spirit and scope of scheme.
Claims (5)
1. a kind of main transformer body grave gas protects circuit characterized by comprising DC power supply, Buchholz relay electric contact, micro-
Machine protection supervisory equipment, the first breaker auxiliary normal opened contact, the second breaker auxiliary normal opened contact, the first breaking coil and the
Two breaking coils；
The Buchholz relay electric contact includes concatenated two electric contacts；
The microcomputer protecting controller includes grave gas relay coil, grave gas relay normally open contact, circuit breaker trip
Exit relay coil, the first circuit breaker trip exit relay normal opened contact, the second circuit breaker trip exit relay are normally opened
Contact, the first circuit breaker trip guard relay coil and the second circuit breaker trip guard relay coil, the grave gas after
When electric apparatus coil obtains electric, the grave gas relay normally open contact closure, the circuit breaker trip exit relay coil obtains electric
When, the first circuit breaker trip exit relay normal opened contact and the second circuit breaker trip exit relay normal opened contact
Closure；
The Buchholz relay electric contact and grave gas relay coil series connection are used as the first branch, the grave gas relay
Device normal opened contact and circuit breaker trip exit relay coil series connection are used as second branch, and first circuit breaker trip goes out
Mouth relay normally open contact, the first circuit breaker trip guard relay coil, first breaker assist normal opened contact
It is used as third branch with first breaking coil series connection, it is the second circuit breaker trip exit relay normal opened contact, described
Second circuit breaker trip guard relay coil, second breaker auxiliary normal opened contact and second breaking coil series connection
As the 4th branch, the first branch, the second branch, the third branch and the 4th branch and the direct current
Source is in parallel.
2. main transformer body grave gas according to claim 1 protects circuit, which is characterized in that connect in the second branch
There is the first tripping in flakes.
3. main transformer body grave gas according to claim 1 protects circuit, which is characterized in that connect the third branch road
There is the second tripping in flakes.
4. main transformer body grave gas according to claim 1 protects circuit, which is characterized in that connect the 4th road
There is third tripping in flakes.
5. main transformer body grave gas according to claim 1 protects circuit, which is characterized in that the Buchholz relay electricity connects
Point is the electric contact of QYJ1-80 type Buchholz relay or QJ-80 type Buchholz relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920239154.4U CN209358237U (en) | 2019-02-25 | 2019-02-25 | Main transformer body grave gas protects circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920239154.4U CN209358237U (en) | 2019-02-25 | 2019-02-25 | Main transformer body grave gas protects circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209358237U true CN209358237U (en) | 2019-09-06 |
Family
ID=67803800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920239154.4U Active CN209358237U (en) | 2019-02-25 | 2019-02-25 | Main transformer body grave gas protects circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209358237U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109830938A (en) * | 2019-02-25 | 2019-05-31 | 山东钢铁股份有限公司 | Main transformer body grave gas protects circuit and method |
-
2019
- 2019-02-25 CN CN201920239154.4U patent/CN209358237U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109830938A (en) * | 2019-02-25 | 2019-05-31 | 山东钢铁股份有限公司 | Main transformer body grave gas protects circuit and method |
| CN109830938B (en) * | 2019-02-25 | 2024-04-02 | 山东钢铁股份有限公司 | Main transformer body heavy gas protection circuit and method |
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