CN206820458U - Intermediate frequency furnace and its 24 arteries and veins transformer relay protecting devices - Google Patents
Intermediate frequency furnace and its 24 arteries and veins transformer relay protecting devices Download PDFInfo
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- CN206820458U CN206820458U CN201720587522.5U CN201720587522U CN206820458U CN 206820458 U CN206820458 U CN 206820458U CN 201720587522 U CN201720587522 U CN 201720587522U CN 206820458 U CN206820458 U CN 206820458U
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Abstract
The utility model discloses a kind of intermediate frequency furnace and its 24 arteries and veins transformer relay protecting devices; including 24 arteries and veins transformers; 24 arteries and veins step down sides are provided with four groups of vice-side windings; export four groups of pulse waves of three-phase 6; every group of each phase output terminal of vice-side winding is cased with current transformer, and current transformer output end is connected with the relay switch component of control high-voltage board vacuum circuit breaker sub-gate circuit break-make；24 each phase output terminals of arteries and veins step down side are provided with current transformer and electric current relay, accuracy of detection during single-phase short circuit can be improved, when reaching electric current relay conducting electric current, high-voltage board and high-pressure side open circuit, prevent high-pressure side from exceeding rated current after increasing because of the increase of low-pressure side electric current and burning out, reduce the probability that transformer is burned；Each current transformer after corresponding bleeder circuit with OR circuit by being connected, and when any one phase occurs short-circuit, the state that the output end of OR circuit can be exported in high level signal control auxiliary reclay changes, and reduces the probability that transformer is burned.
Description
Technical field
Metallurgical technology field is the utility model is related to, more specifically, it relates to which a kind of intermediate frequency furnace and its 24 arteries and veins become
Depressor protective relaying device.
Background technology
At present, with the raising that country is required using energy source, the electric power system of intermediate frequency furnace is by 6 original arteries and veins, 12
Arteries and veins rectification is improved to 24 arteries and veins rectifications at this stage.Configuration universal in industry at present is formed with two 12 arteries and veins rectifier transformers
24 arteries and veins commutation systems, by the high-pressure side to this two 12 arteries and veins rectifier transformers carry out respectively+7.5 degree and -7.5 degree phase shifts come
The phase shift of 15 degree of low-pressure side four group is obtained, to realize 24 arteries and veins rectifications.It is this combined by some rectifier transformers 24
Arteries and veins rectifier transformer system has following defect：One loss is big, because the open circuit loss of whole 24 arteries and veins commutation system and with load-loss
It is the loss sum of the rectifier transformer of composition；2nd, harmonic content is high, it is difficult to which meeting to network requires；3rd, investment is big, cost is high,
Not only rectifier transformer needs some, and every rectifier transformer is also individually equipped with a set of control device.
In the prior art, it is proposed that a kind of 24 arteries and veins rectifier transformers, the Authorization Notice No. as this department applies before are
CN204480861U Chinese utility model patent discloses a kind of 24 arteries and veins rectifier transformers and centreless Medium frequency induction system, directly
Connect and provided by a 24 arteries and veins rectifier transformers.The low-pressure side of 24 arteries and veins rectifier transformers directly exports 4 groups of pulse waves of three-phase 6, due to
The load of every group of 6 pulse waves is identical, so the electric current of every group of 6 pulse waves is identical, and on high-tension side electric current and the electric current of low-pressure side are into just
Than, because low-pressure side has 4 groups of pulse waves of three-phase 6, its on high-tension side setting current is determined according to the total current of low-pressure side, so
Once the output winding of low-pressure side becomes more, on high-tension side setting current and the number of windings are proportional, but in fact, on high-tension side specified
Electric current is likely less than setting current.
In actual mechanical process, high-pressure side is provided with protective relaying device, but works as the pulse wave output circuit of one of which 6
When generation is short-circuit, on high-tension side electric current is accordingly raised, and the electric current is likely located between rated current and setting current, i.e. high-pressure side
Electric current exceed and rated current but be unlikely to trigger on high-tension side protective relaying device, reduce the essence of high-pressure side relay protection
Degree, causes 24 arteries and veins transformers to be burned.
Utility model content
In view of the deficienciess of the prior art, the first purpose of the present utility model is to provide a kind of 24 arteries and veins transformer relays
Protection device, it is possible to increase the precision of relay protection, reduce the probability that transformer is burned.
To achieve the above object, the utility model provides following technical scheme：
A kind of 24 arteries and veins transformer relay protecting devices, including the 24 arteries and veins transformers electrically connected with high-voltage board, 24 arteries and veins become
The low-pressure side of depressor is provided with four groups of vice-side windings, exports four groups of pulse waves of three-phase 6, and each phase output terminal of every group of vice-side winding covers
Provided with current transformer, the output end of the current transformer is connected with for controlling vacuum circuit breaker sub-gate circuit in high-voltage board
The relay switch component of break-make.
By using above-mentioned technical proposal, when there is a 6 pulse wave output short-circuit, connected single-phase output electric current increases
Greatly, by the magnetic flux quantitative change of iron core greatly so as to cause high voltage side current to increase, when it exceedes rated current, the transformer easily quilt
Burn out；When now being changed due to monophase current, changed by the magnetic flux of current transformer, current transformer output
Induced-current, the induced-current can control the break-make of relay switch component so as to control high-voltage board and 24 arteries and veins high voltage side of transformer
Break-make, to prevent transformer to be damaged.
Further, the relay switch component includes the electric current relay that coil is series at each current transformer output end
Device, it is coupled to for controlling vacuum circuit breaker sub-gate circuit break-make in high-voltage board after the contact shunt of each electric current relay
The coil side of auxiliary reclay, vacuum circuit breaker sub-gate circuit and input in the contact portion high-voltage board of the auxiliary reclay
Power supply.
By using above-mentioned technical proposal, electric current relay has specified conducting electric current, and when having, a 6 pulse waves output is short
Lu Shi, connected single-phase output electric current increase, the induced-current of current transformer output reach the specified of electric current relay
During electric current, the contact closure of electric current relay, so as to turn on the coil of auxiliary reclay, break after the coil electricity of auxiliary reclay
Its contact is opened so that the vacuum circuit breaker in high-voltage board is disconnected to prevent transformer damage.
Further, the relay switch component includes being coupled to the bleeder circuit of each current transformer output end, input
End is coupled to the OR circuit of each bleeder circuit output end and output end output short-circuit signal and is coupled to the OR circuit
The auxiliary reclay of output end, vacuum circuit breaker sub-gate circuit and input electricity in the contact portion high-voltage board of the auxiliary reclay
Source.
By using above-mentioned technical proposal, when there is a 6 pulse wave output short-circuit, connected single-phase output electric current increases
Greatly, after by bleeder circuit partial pressure, by the input of corresponding control source OR circuit, wherein, the effect of bleeder circuit is
In order to obtain the magnitude of voltage to match with the input voltage of OR circuit input, exported when a 6 pulse wave output short-circuits are corresponding
Magnitude of voltage can determine whether as high level signal；Also, if low-pressure side it is single-phase carry out small range current fluctuation when, Current Mutual Inductance
Induced-current caused by device will not be judged as high level signal after bleeder circuit, avoid when electric current small range fluctuates
Interference；The output end of OR circuit output high level signal, can be that auxiliary reclay is powered when having single-phase short circuit, it is middle after
Its contact is disconnected after the coil electricity of electrical equipment so that the vacuum circuit breaker in high-voltage board is disconnected to prevent transformer damage.
Further, the bleeder circuit includes two resistance of series connection, and the tie point of two resistance is coupled to OR gate
The input of circuit.
By using above-mentioned technical proposal, corresponding magnitude of voltage can be obtained by the ratio for adjusting two resistance.
Further, the high-pressure side of the 24 arteries and veins transformer has a Y types connection winding, low-pressure side have four groups of secondary around
Group, the vice-side winding is respectively Y types vice-side winding, just prolonging △ types vice-side winding, △ types vice-side winding and counter prolongs △ type secondary
Winding, the phase of the vice-side winding differ 15 degree successively, and the output end of the vice-side winding intermediate frequency with intermediate frequency furnace respectively
Power supply connects.
Second purpose of the present utility model is to provide a kind of intermediate frequency furnace, it is possible to increase part of appliance uses the longevity
Life, reduce replacement cost.To achieve the above object, the utility model provides following technical scheme：
A kind of intermediate frequency furnace, including the 24 arteries and veins transformer relay protecting device as described in purpose 1.
By using above-mentioned technical proposal, the service life of part of appliance can be improved, reduces replacement cost.
Compared with prior art, the utility model has the advantages that：
1st, current transformer and electric current relay have been arranged in each phase output terminal of 24 arteries and veins step down sides, can improved
Accuracy of detection during single-phase short circuit, when reaching the setting conducting electric current of electric current relay, high-voltage board and high-pressure side open circuit, prevent
High-pressure side exceedes rated current after increasing because of the increase of low-pressure side electric current and burnt out, and reduces the probability that transformer is burned；
2nd, each current transformer is after corresponding bleeder circuit with the input of OR circuit by being connected, when having wherein
When any one phase occurs short-circuit, the output end of OR circuit can export the state hair in high level signal control auxiliary reclay
It is raw to change, reduce the probability that transformer is burned.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of the driving current relay power of embodiment one of the present utility model；
Fig. 2 is the circuit theory diagrams that the arteries and veins transformer of control 24 of embodiment one of the present utility model powers off；
Fig. 3 is the circuit theory diagrams of embodiment two of the present utility model.
Reference：1st, 24 arteries and veins transformer；2nd, current transformer；3rd, bleeder circuit；4th, OR circuit；5th, high-voltage board.
Embodiment
With reference to the accompanying drawings and examples, the utility model is described in detail.
Embodiment one：A kind of 24 arteries and veins transformer relay protecting devices, reference picture 1, including 24 arteries and veins electrically connected with high-voltage board 5
Transformer 1, the high-pressure side of the 24 arteries and veins transformer 1 have a Y types connection winding, and low-pressure side has four groups of vice-side windings, secondary around
Group is respectively Y types vice-side winding, just prolonging △ types vice-side winding, △ types vice-side winding and counter prolongs △ type vice-side windings, vice-side winding
Phase differ 15 degree successively, and the output end of vice-side winding is connected with the intermediate frequency power supply of intermediate frequency furnace respectively.24 arteries and veins becomes
Depressor 1, which has, is lost the advantages of small, harmonic content is few, investment is small and cost is low.
Every group of vice-side winding can export four groups of pulse waves of three-phase 6, in order to improve the accuracy of detection of single-phase short circuit, at every group
Each phase output terminal of vice-side winding has been arranged current transformer 2, and when single-phase short circuit, the electric current for flowing through transformer becomes
Change, current transformer 2 produces induced-current accordingly, and the output end of current transformer 2 is connected with for controlling in high-voltage board 5 very
The relay switch component of empty brake division loop of circuit breaker break-make, the relay switch component receive and respond to induced-current.
In the present embodiment, relay switch component includes the electric current relay that coil is series at each output end of current transformer 2,
Conducting electric current can be set in electric current relay, and induced-current caused by the current transformer 2 only after single-phase short circuit can make electricity
Current relay works, and eliminates the interference that monophase current is stirred by a small margin.Reference picture 2, after the contact shunt of each electric current relay
It is coupled to the coil side for controlling the auxiliary reclay of vacuum circuit breaker sub-gate circuit break-make in high-voltage board 5, middle relay
Vacuum circuit breaker sub-gate circuit and input power in the contact portion high-voltage board of device.In the present embodiment, electric current relay is using normal
Open form relay, auxiliary reclay use closed type relay.
After short circuit occurs for any one phase, its corresponding electric current relay exports faradic in current transformer 2
Under driving, make contact closure corresponding to electric current relay, so as to turn on the coil of auxiliary reclay, so as to by middle relay
Contact corresponding to device is opened, and disconnects the vacuum circuit breaker in high-voltage board 5, the open circuit of 24 arteries and veins transformer 1, prevents 24 arteries and veins transformers 1
Burn out.
Embodiment two：
A kind of 24 arteries and veins transformer relay protecting devices, reference picture 3, the difference with embodiment one be, relay switch component
Bleeder circuit 3, input including being coupled to each output end of current transformer 2 are coupled to each output end of bleeder circuit 3 and output
Hold the OR circuit 4 of output short-circuit signal and be coupled to the auxiliary reclay of the output end of OR circuit 4, auxiliary reclay
Vacuum circuit breaker sub-gate circuit and input power in contact portion high-voltage board.
Wherein, bleeder circuit 3 includes two resistance of series connection, and the tie point of two resistance is coupled to OR circuit 4
Input.In another embodiment, the resistance of one of them is potentiometer, can adjust the ratio of two resistances.
When single-phase short circuit, connected single-phase output electric current increase, after the partial pressure of bleeder circuit 3, by corresponding to
The input of control source OR circuit 4, wherein, the effect of bleeder circuit 3 is defeated with the input of OR circuit 4 in order to obtain
Enter the magnitude of voltage that voltage matches, when the magnitude of voltage of the corresponding output of a 6 pulse wave output short-circuits can determine whether as high level signal；And
And if low-pressure side it is single-phase carry out small range current fluctuation when, induced-current caused by current transformer 2 passes through bleeder circuit
High level signal will not be judged as after 3, avoids the interference during fluctuation of electric current small range；When having single-phase short circuit, OR gate electricity
The output end output high level signal on road 4, it can be that auxiliary reclay is powered, disconnect its contact after the coil electricity of auxiliary reclay
So that the vacuum circuit breaker in high-voltage board 5 disconnects, the open circuit of 24 arteries and veins transformer 1, prevent 24 arteries and veins transformers 1 from burning out.
Embodiment three：A kind of intermediate frequency furnace, including the 24 arteries and veins transformer relays as described in embodiment one or embodiment two
Protection device.
Described above is only preferred embodiment of the present utility model, and the scope of protection of the utility model is not limited merely to
Above-described embodiment, all technical schemes belonged under the utility model thinking belong to the scope of protection of the utility model.It should refer to
Go out, for those skilled in the art, some improvement under the premise of the utility model principle is not departed from and
Retouching, these improvements and modifications also should be regarded as the scope of protection of the utility model.
Claims (6)
1. a kind of 24 arteries and veins transformer relay protecting devices, including the 24 arteries and veins transformers (1) electrically connected with high-voltage board (5), described 24
The low-pressure side of arteries and veins transformer (1) is provided with four groups of vice-side windings, exports four groups of pulse waves of three-phase 6, it is characterised in that every group of secondary around
Each phase output terminal of group is arranged with current transformer (2), and the output end of the current transformer (2) is connected with for controlling height
Press the relay switch component of vacuum circuit breaker sub-gate circuit break-make in cabinet (5).
2. 24 arteries and veins transformer relay protecting device according to claim 1, it is characterised in that the relay switch component bag
Include the electric current relay that coil is series at each current transformer (2) output end, coupling after the contact shunt of each electric current relay
It is connected to the coil side for controlling the auxiliary reclay of vacuum circuit breaker sub-gate circuit break-make in high-voltage board (5), the centre
Vacuum circuit breaker sub-gate circuit and input power in the contact portion high-voltage board (5) of relay.
3. 24 arteries and veins transformer relay protecting device according to claim 1, it is characterised in that the relay switch component bag
Include be coupled to each current transformer (2) output end bleeder circuit (3), input be coupled to each bleeder circuit (3) output end and
The OR circuit (4) of output end output short-circuit signal and the auxiliary reclay for being coupled to the OR circuit (4) output end,
Vacuum circuit breaker sub-gate circuit and input power in the contact portion high-voltage board (5) of the auxiliary reclay.
4. 24 arteries and veins transformer relay protecting device according to claim 3, it is characterised in that bleeder circuit (3) bag
Two resistance of series connection are included, and the tie point of two resistance is coupled to the input of OR circuit (4).
5. the 24 arteries and veins transformer relay protecting devices according to claim 2 or 4, it is characterised in that the 24 arteries and veins transformer
(1) high-pressure side has Y types connection winding, and low-pressure side has four groups of vice-side windings, and the vice-side winding is respectively Y type pairs
Side winding, just prolonging △ types vice-side winding, △ types vice-side winding and it is counter prolong △ type vice-side windings, the phase of the vice-side winding is successively
15 degree of difference, and the output end of vice-side winding is connected with the intermediate frequency power supply of intermediate frequency furnace respectively.
6. a kind of intermediate frequency furnace, it is characterised in that including the 24 arteries and veins transformer relay as described in any one in claim 1-5
Protection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720587522.5U CN206820458U (en) | 2017-05-24 | 2017-05-24 | Intermediate frequency furnace and its 24 arteries and veins transformer relay protecting devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720587522.5U CN206820458U (en) | 2017-05-24 | 2017-05-24 | Intermediate frequency furnace and its 24 arteries and veins transformer relay protecting devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206820458U true CN206820458U (en) | 2017-12-29 |
Family
ID=60757329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720587522.5U Active CN206820458U (en) | 2017-05-24 | 2017-05-24 | Intermediate frequency furnace and its 24 arteries and veins transformer relay protecting devices |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206820458U (en) |
-
2017
- 2017-05-24 CN CN201720587522.5U patent/CN206820458U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 201607 No. 555, Zhongmin Road, Maogang Town, Songjiang District, Shanghai Patentee after: Shanghai Zhaoli electric furnace equipment Co.,Ltd. Address before: 201607 No. 555, Zhongmin Road, Maogang Town, Songjiang District, Shanghai Patentee before: SHANGHAI ZHAOLI ELECTRICAL APPLIANCES MANUFACTURING Co.,Ltd. |