CN209894958U - Device for judging fusing of primary side high-voltage fuse of voltage transformer - Google Patents
Device for judging fusing of primary side high-voltage fuse of voltage transformer Download PDFInfo
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- CN209894958U CN209894958U CN201920365958.9U CN201920365958U CN209894958U CN 209894958 U CN209894958 U CN 209894958U CN 201920365958 U CN201920365958 U CN 201920365958U CN 209894958 U CN209894958 U CN 209894958U
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- 230000008030 elimination Effects 0.000 claims abstract description 41
- 238000003379 elimination reaction Methods 0.000 claims abstract description 41
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 230000008859 change Effects 0.000 abstract description 3
- 230000006378 damage Effects 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 abstract description 3
- 208000027418 Wounds and injury Diseases 0.000 abstract description 2
- 208000014674 injury Diseases 0.000 abstract description 2
- 230000007774 longterm Effects 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000001012 protector Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of power equipment, in particular to a device for judging fusing of a primary side high-voltage fuse of a voltage transformer, which comprises a harmonic elimination branch circuit connected in parallel with an opening triangular output end of a three-phase voltage transformer, wherein the harmonic elimination branch circuit comprises a harmonic elimination resistor, a disconnection judging resistor input circuit and a current detection module, and the harmonic elimination resistor, the disconnection judging resistor input circuit and the current detection module are sequentially connected in series; and the current detection module and the secondary side three-phase output end of the three-phase voltage transformer are connected with the control unit. The utility model discloses an exempt from harmonious device at present and modify, add the broken string and judge that resistance drops into circuit and current detection module, make it can increase the resistance of harmonic elimination branch road when opening triangle current sudden change, judge through the amplitude decline condition of certain looks voltage transformer whether the high-voltage fuse of a certain looks of once inclining takes place the fusing to further assurance grid system's normal operating avoids not in time discovering the injury that the fusing accident caused to the personnel of patrolling and examining when.
Description
Technical Field
The utility model relates to a power equipment technical field is a device is judged in fusing of voltage transformer side high voltage fuse.
Background
A resonance-free device is added on the secondary side of the voltage transformer, so that the resonance of the voltage transformer is effectively eliminated, and the phenomenon of fusing of a fuse of a high-voltage fuse due to the resonance can not occur on the primary side of the voltage transformer. However, the fuse wire of the high-voltage fuse can be blown out due to other reasons, such as the fact that the leakage fuse wire of the high-voltage fuse is naturally blown out due to long-term oxidation, the product quality problem and the like.
Under the condition that a power grid system normally operates, the tuning-free device working at the three corners of the opening of the voltage transformer has small adjustable resistance, so that after the fuse wire of the primary side high-voltage fuse of the voltage transformer is fused, the three-phase voltage output change of the voltage transformer is extremely small, and the fuse wire of a certain phase high-voltage fuse on the primary side cannot be judged to be fused.
Disclosure of Invention
The utility model provides a voltage transformer once side high tension fuse fuses judgement device has overcome above-mentioned prior art not enough, and it can effectively solve the problem that can not judge that voltage transformer once side certain phase high tension fuse fuses that harmonic device exists of exempting from of current work in voltage transformer opening three angle departments exists.
The technical scheme of the utility model is realized through following measure: a device for judging the fusing of a primary side high-voltage fuse of a voltage transformer comprises a three-phase voltage transformer and a control unit; the harmonic elimination branch circuit is connected in parallel with the open triangle output end of the three-phase voltage transformer and comprises a harmonic elimination resistor, a disconnection judgment resistor input circuit and a current detection module, the open triangle first output end of the three-phase voltage transformer is connected with the harmonic elimination resistor, the disconnection judgment resistor input circuit and the current detection module are sequentially connected in series, and the current detection module is connected with the open triangle second output end of the three-phase voltage transformer; the current detection module and the secondary side three-phase output end of the three-phase voltage transformer are connected with the control unit, and the control unit is connected with the disconnection judging resistance input circuit.
The following are further optimization or/and improvement of the technical scheme of the utility model:
the disconnection judging resistance input circuit can comprise a disconnection judging resistance and a relay, the control unit is connected with a relay coil, a normally closed contact of the relay is connected with the disconnection judging resistance in parallel, and two ends of the disconnection judging resistance are respectively connected with the resonance elimination resistance and the current detection module.
The resistance value of the resonance elimination resistor can be not more than 12 ohms; the disconnection determination resistance may be not less than 15 ohms.
The resonance elimination resistor can be an adjustable resistor.
The current detection module can be a current transformer.
The utility model has the advantages of simple structure, high durability and convenient use, modify through exempting from harmonious device at present, add the broken string and judge that resistance drops into circuit and current detection module, perfect its function, make it can increase the resistance of harmonic elimination branch road when opening triangle current sudden change, make the certain looks voltage amplitude that takes place to open circuit descend, and judge through the amplitude decline condition of certain looks voltage transformer whether take place the fusing once a certain looks high-voltage fuse of three-phase voltage transformer, thereby in time discover by the long-term oxidation nature fusing of high-voltage fuse gas leakage fuse, factor such as product quality problem happens the fuse fusing accident, further assurance electric wire netting system's normal operating, the injury that causes the patrolling and examining personnel when avoiding not in time discovering the fusing accident.
Drawings
Fig. 1 is a schematic circuit diagram of the preferred embodiment of the present invention.
Fig. 2 is a control block diagram of the preferred embodiment of the present invention.
Fig. 3 is a flow chart of the preferred embodiment of the present invention.
The codes in the figures are respectively: rXFor harmonic elimination of resistance, RPDetermination of resistance for wire breakage, JPIs a relay, IPThe current detection module comprises PT (potential transformer), A, B, C (primary side three-phase input end), a, b and c (secondary side three-phase output end), a ', b' and c 'as three-phase voltage transformers, and a, b and c' as three-phase voltage transformersThree-phase, F, of secondary side open delta windingA、FB、FCIs a three-phase high-voltage fuse, U△Is an open delta voltage, daIs a first output end of an open triangle, dnIs an open triangular second output end.
Detailed Description
The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.
The invention will be further described with reference to the following examples and drawings:
as shown in the attached drawings 1 and 2, the device for judging the fusing of the primary side high-voltage fuse of the voltage transformer comprises a three-phase voltage transformer PT and a control unit; the open triangular output end of the three-phase voltage transformer PT is connected in parallel with a harmonic elimination branch circuit which comprises a harmonic elimination resistor RXDisconnection judging resistance input circuit and current detection module IPFirst output end d of open triangle of three-phase voltage transformer PTaHarmonic elimination resistor RXConnecting and resonance eliminating resistor RXDisconnection judging resistance input circuit and current detection module IPSequentially connected in series, current detection module IPAnd a second output end d of an opening triangle of a three-phase voltage transformer PTnConnecting; current detection module IPAnd the three-phase output ends a, b and c of the secondary side of the three-phase voltage transformer are all connected with a control unit, and the control unit is connected with a disconnection judging resistance input circuit.
The control unit is a known technology in the prior art and can be an upper computer or an industrial personal computer. The control unit passes through a current detection module IPCollecting open triangular current of a three-phase voltage transformer PT, and simultaneously collecting three-phase voltages of three-phase output ends a, b and c of a secondary side of the three-phase voltage transformer by a control unit; judging whether the acquired data meet the condition that the resistance input circuit inputs resistance to the harmonic elimination branch or not, if so, judging that the resistance input circuit inputs resistance to the harmonic elimination branch, increasing the resistance of the harmonic elimination branch, and reflecting the voltage passing through the harmonic elimination branch by an opening triangle of the three-phase voltage transformer; then the control unit collectsAnd if the voltage amplitude of a certain phase of the three-phase voltages of the three-phase output ends a, b and c on the secondary side of the three-phase voltage transformer is reduced to be larger than N, the high-voltage fuse of the phase is judged to be fused.
The resonance elimination resistor RXThe resistance value of the three-phase voltage transformer PT is according to the open triangular voltage U of the three-phase voltage transformer PT△The setting is performed.
The utility model discloses simple structure, convenient to use through exempting from harmonious device at present and amending, add the broken string and judge that resistance drops into circuit and current detection module IPThe function of the high-voltage fuse protector is improved, the resistance of a harmonic elimination branch can be increased when the open delta current suddenly changes, the amplitude of a certain phase voltage with an open circuit is reduced, whether the high-voltage fuse protector of a certain phase on the primary side of the three-phase voltage transformer is fused or not is judged according to the amplitude reduction condition of the certain phase voltage, and therefore the fuse fusing accident happens by the factors such as long-term oxidation natural fusing of a leakage fuse of the high-voltage fuse protector, product quality problems and the like can be found in time, the normal operation of a power grid system is further guaranteed, and the damage to inspection personnel caused by the fact that the fusing accident.
The device for judging the fusing of the primary side high-voltage fuse of the voltage transformer can be further optimized or/and improved according to actual needs:
as shown in FIGS. 1 and 2, the disconnection judging resistance inputting circuit includes a disconnection judging resistance RPAnd relay JPThe control unit is connected with a relay coil, and a normally closed contact of the relay and a disconnection judging resistor RPParallel connection and disconnection judging resistor RPAre respectively connected with the resonance elimination resistor RXCurrent detecting module IPAnd (4) connecting.
The control unit controls the normally closed contact of the relay to open and close through the relay coil, thereby controlling the disconnection judging resistor RPWhether a harmonic elimination branch is connected or not, namely if the normally closed contact of the relay is closed, the normally closed contact of the relay breaks the line to judge the resistance RPShort circuit and broken wire judging resistor RPThe harmonic elimination branch circuit is not put into, if the normally closed contact of the relay is disconnected, the disconnection judgment resistor RPAnd putting a harmonic elimination branch.
As shown in fig. 1, the resonance elimination resistor RXIs not more than 12 ohms; the disconnection judging resistor RPNot less than 15 ohms.
Three-phase voltage transformer opening triangular voltage U specified by national standard△Less than 15V, when U△Harmonic elimination resistor R at 15VXIs 12 ohms, so that the resonance elimination resistor RXIs not more than 12 ohms; disconnection judging resistor RPThe judgment is carried out according to the condition that whether the fuse wire of the high-voltage fuse of a certain phase is blown or not, namely whether the voltage amplitude is reduced to be larger than N of N.
According to the need, the resonance elimination resistor RXIs an adjustable resistor.
According to the requirement, the current detection module IPIs a current transformer.
As shown in fig. 3, the determining method of the present invention comprises the following steps:
s1, the power grid system runs normally, and the disconnection judgment resistance input circuit does not input resistance to the harmonic elimination branch circuit;
s2, the control unit passes through the current detection module IPCollecting open triangular current of a three-phase voltage transformer, and simultaneously collecting three-phase voltages of three-phase output ends a, b and c of a secondary side of the three-phase voltage transformer by a control unit;
s3, the control unit judges whether the collected data meets the condition that the disconnection judging resistance input circuit inputs resistance to the resonance elimination branch or not, and responds to all the conditions, the disconnection judging resistance input circuit inputs resistance to the resonance elimination branch;
and S4, after the circuit input resistance is judged to be disconnected, the control unit acquires three-phase voltages of three-phase output ends a, b and c on the secondary side of the three-phase voltage transformer, judges whether the voltage amplitude of a certain phase in the three-phase voltages is reduced to be larger than N (the specific value of N is set according to actual conditions), and judges that the fuse wire of the high-voltage fuse of the certain phase is fused in response to the fact that the voltage amplitude of the certain phase is reduced to be larger than N.
The judgment of whether the voltage amplitude of a certain phase in the three-phase voltage is reduced by more than N is carried out compared with the normal three-phase voltage.
In S3, the condition for the disconnection determination resistance input circuit to input the resistance to the resonance elimination branch is:
a. the opening triangular current at the current moment is suddenly changed to exceed M compared with the normal opening triangular current (the specific numerical value of M is set under the actual condition);
b. the opening triangular current is power frequency current;
c. the three-phase voltage instantaneous value does not generate mutation.
The above N may be set to 30% and M may be set to 5%.
The method also comprises setting a harmonic elimination resistor R before the fusing judgment of the primary side high-voltage fuse of the voltage transformer is startedXJudging the resistance value which can be input by the resistor input circuit according to the resistance value and the broken line;
resonance elimination resistor RXThe resistance value of the three-phase voltage transformer PT is according to the open triangular voltage U of the three-phase voltage transformer PT△The specific formula is as follows:
wherein, U△The open delta voltage of the three-phase voltage transformer PT; k is the saturation multiple of the voltage transformer design, and S is the rated power of each phase of the voltage transformer
The resistance value which can be input by the disconnection judging resistance input circuit is determined by judging whether a fuse wire fusing condition occurs in a certain phase of high-voltage fuse, namely whether the voltage amplitude is reduced to be larger than N in N.
Above technical feature constitutes the utility model discloses a best embodiment, it has stronger adaptability and best implementation effect, can increase and decrease unnecessary technical feature according to actual need, satisfies the demand of different situation.
Claims (6)
1. A device for judging the fusing of a high-voltage fuse on the primary side of a voltage transformer is characterized by comprising a three-phase voltage transformer and a control unit; the harmonic elimination branch circuit is connected in parallel with the open triangle output end of the three-phase voltage transformer and comprises a harmonic elimination resistor, a disconnection judgment resistor input circuit and a current detection module, the open triangle first output end of the three-phase voltage transformer is connected with the harmonic elimination resistor, the disconnection judgment resistor input circuit and the current detection module are sequentially connected in series, and the current detection module is connected with the open triangle second output end of the three-phase voltage transformer; the current detection module and the secondary side three-phase output end of the three-phase voltage transformer are connected with the control unit, and the control unit is connected with the disconnection judging resistance input circuit.
2. The device for determining fusing of a primary-side high-voltage fuse of a voltage transformer according to claim 1, wherein the circuit for inputting the disconnection determining resistor comprises a disconnection determining resistor and a relay, the control unit is connected to a coil of the relay, a normally closed contact of the relay is connected in parallel to the disconnection determining resistor, and two ends of the disconnection determining resistor are connected to the resonance elimination resistor and the current detection module, respectively.
3. The device for determining the fusing of a primary-side high-voltage fuse of a voltage transformer according to claim 2, wherein the resonance elimination resistor has a resistance value of not more than 12 ohms; and the disconnection judging resistance is not less than 15 ohms.
4. The device for determining the blowout of a primary-side high-voltage fuse of a voltage transformer according to claim 1, 2 or 3, wherein the detuning resistor is an adjustable resistor.
5. The device for determining fusing of a primary-side high-voltage fuse of a voltage transformer according to claim 1, 2 or 3, wherein the current detection module is a current transformer.
6. The device for determining fusing of a primary-side high-voltage fuse of a voltage transformer according to claim 4, wherein the current detecting module is a current transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920365958.9U CN209894958U (en) | 2019-03-14 | 2019-03-14 | Device for judging fusing of primary side high-voltage fuse of voltage transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920365958.9U CN209894958U (en) | 2019-03-14 | 2019-03-14 | Device for judging fusing of primary side high-voltage fuse of voltage transformer |
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| CN209894958U true CN209894958U (en) | 2020-01-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007261A (en) * | 2019-03-14 | 2019-07-12 | 国网新疆电力有限公司昌吉供电公司 | Voltage transformer primary side High-voltage Fuse Blow judgment means and its judgment method |
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2019
- 2019-03-14 CN CN201920365958.9U patent/CN209894958U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110007261A (en) * | 2019-03-14 | 2019-07-12 | 国网新疆电力有限公司昌吉供电公司 | Voltage transformer primary side High-voltage Fuse Blow judgment means and its judgment method |
| CN110007261B (en) * | 2019-03-14 | 2024-03-19 | 国网新疆电力有限公司昌吉供电公司 | Device and method for judging fusing of primary side high-voltage fuse of voltage transformer |
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