CN219201803U - Ferromagnetic resonance detection circuit and device for medium-voltage power plant system - Google Patents
Ferromagnetic resonance detection circuit and device for medium-voltage power plant system Download PDFInfo
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- CN219201803U CN219201803U CN202320093942.3U CN202320093942U CN219201803U CN 219201803 U CN219201803 U CN 219201803U CN 202320093942 U CN202320093942 U CN 202320093942U CN 219201803 U CN219201803 U CN 219201803U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
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- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The utility model relates to a ferromagnetic resonance detection circuit and a ferromagnetic resonance detection device for a medium-voltage power system, wherein the circuit comprises a first voltage conversion unit for converting three-phase mains supply into medium-voltage, an equivalent capacitance unit for simulating the equivalent capacitance to the ground of the medium-voltage power system, an interface unit for connecting a voltage transformer of a medium-voltage switch cabinet, a fault unit for controlling the medium-voltage to generate a ground fault and a waveform acquisition unit for acquiring the voltage waveform of the medium-voltage; by implementing the utility model, a worker can judge the ferromagnetic resonance characteristic of the medium-voltage power system by observing the voltage waveform, so that the worker can correspondingly adjust the existing resonance elimination measures, and the reliability of the medium-voltage power system is improved.
Description
Technical Field
The utility model relates to the technical field of medium-voltage power plant systems, in particular to a ferromagnetic resonance detection circuit and device of a medium-voltage power plant system.
Background
The medium-voltage plant power system of the nuclear power plant not only needs to supply power for plant equipment and public equipment of 2 units, but also needs to supply power for the nuclear safety plant equipment, and plays an important role in keeping the normal and safe operation of the nuclear power plant.
In addition, the medium voltage power system can transmit electric energy to the equipment only through a long medium voltage cable, so that the capacitance to the ground caused by the medium voltage cable is very easy to match with the electromagnetic voltage transformer, and ferromagnetic resonance is generated under the excitation of ground faults and the like.
Meanwhile, along with the continuous transformation of a nuclear power plant, the lengths of equipment and medium-voltage cables of a medium-voltage power plant system to be powered also change, and the aging of various equipment also affects the resonance characteristics of the medium-voltage power plant system, so that the ferromagnetic resonance characteristics of the medium-voltage power plant system are finally changed and unexpected, the existing resonance elimination measures are difficult to achieve the expected effect, and the existing nuclear power plant lacks special ferromagnetic resonance detection equipment of the medium-voltage power plant system, so that workers are difficult to evaluate whether the resonance elimination measures are effective or not, and the effect of the resonance elimination measures can be realized only after the corresponding abnormality occurs.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a ferromagnetic resonance detection circuit and device for a medium-voltage station electric system.
The technical scheme adopted for solving the technical problems is as follows: constructing a ferromagnetic resonance detection circuit of a medium voltage industrial electrical system, the circuit comprising:
the first voltage conversion unit is used for converting three-phase mains supply into medium voltage, the input end of the first voltage conversion unit is used for being connected with the three-phase mains supply, and the output end of the first voltage conversion unit is connected with a three-phase bus;
the equivalent capacitance unit is connected with the three-phase bus and used for simulating the equivalent capacitance to the ground of the medium-voltage station power system;
the interface unit is connected with the three-phase bus and used for connecting a voltage transformer of the medium-voltage switch cabinet;
the fault unit is connected with the three-phase bus and used for controlling the medium-voltage to generate a ground fault;
and the waveform acquisition unit is connected with the three-phase bus and used for acquiring the voltage waveform of the medium voltage.
Preferably, the ferromagnetic resonance detection circuit of the medium voltage power plant system further comprises a protection unit for preventing the medium voltage output from overcurrent; the protection unit is connected with the output end of the first voltage conversion unit.
Preferably, the protection unit includes a first arrester F1, a second arrester F2, and a third arrester F3; the first lightning arrester F1 is connected with a first phase line in the three-phase bus, the second lightning arrester F2 is connected with a second phase line in the three-phase bus, and the third lightning arrester F3 is connected with a third phase line in the three-phase bus.
Preferably, the waveform acquisition unit includes a second voltage conversion unit and a recorder LBY;
the input end of the second voltage conversion unit is connected with the three-phase bus, and the output end of the second voltage conversion unit is connected with the recorder LBY.
Preferably, the first voltage conversion unit includes a first transformer T and a first circuit breaker QF1; the primary side of the first transformer T is connected with the output end of the first breaker QF1, the input end of the first breaker QF1 is the input end of the first voltage conversion unit, and the secondary side of the first transformer T is the output end of the first voltage conversion unit.
Preferably, the equivalent capacitance unit comprises a plurality of capacitance setting units for setting the equivalent capacitance to ground of the medium-voltage power system; and each capacitance setting unit is connected with the three-phase bus.
Preferably, the equivalent capacitance value set by each capacitance setting unit is different.
Preferably, each of the capacitance setting units includes three capacitance setting loops; the input ends of the three capacitance setting loops are sequentially connected with a first phase line, a second phase line and a third phase line in the three-phase bus;
wherein each of said capacitive value-setting loops comprises a first capacitance C5 and a second circuit breaker QS5; after the first capacitor C5 and the second circuit breaker QS5 are connected in series, a series circuit is formed, a first end of the series circuit is an input end of the capacitor setting circuit, and a second end of the series circuit is grounded.
Preferably, the number of the capacitance setting units is seven.
The utility model also constructs a ferromagnetic resonance detection device of the medium voltage power plant system, which comprises the ferromagnetic resonance detection circuit of the medium voltage power plant system provided by the embodiment of the utility model.
The beneficial effects of the utility model are as follows: providing a ferromagnetic resonance detection circuit of a medium-voltage station power system; a first voltage conversion unit for converting the three-phase mains supply into medium voltage through the first voltage conversion unit and outputting the medium voltage; then, simulating the equivalent capacitance to the ground of the medium voltage station power system through an equivalent capacitance unit, and connecting a voltage transformer for connecting the medium voltage switch cabinet through an interface unit;
then the fault unit is used for controlling the medium voltage to generate a ground fault so as to excite the medium voltage station service electric system to generate ferromagnetic resonance; and finally, the voltage waveform of the medium voltage is acquired by the waveform acquisition unit, so that a worker can judge the ferromagnetic resonance characteristic of the medium voltage power plant system by observing the voltage waveform, the worker can correspondingly adjust the existing resonance elimination measures, the reliability of the medium voltage power plant system is improved, and the stability and the safety of the nuclear power plant are further improved.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of a ferromagnetic resonance detection circuit of a medium voltage power plant system according to some embodiments of the present utility model;
FIG. 2 is a circuit diagram of a ferromagnetic resonance detection circuit of a medium voltage electrical system in some embodiments of the present utility model.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present utility model, a detailed description of embodiments of the present utility model will be made with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a ferromagnetic resonance detection circuit for a medium voltage power plant system for checking ferromagnetic resonance characteristics of the medium voltage power plant system in some embodiments of the present utility model. The ferromagnetic resonance detection circuit of the medium-voltage station power system comprises:
the three-phase power supply device comprises a first voltage conversion unit 1 for converting three-phase mains supply into medium voltage, wherein the input end of the first voltage conversion unit 1 is used for being connected with the three-phase mains supply, and the output end of the first voltage conversion unit 1 is connected with a three-phase bus;
the equivalent capacitance unit 2 is connected with the three-phase bus and used for simulating the equivalent capacitance to the ground of the medium-voltage station power system;
an interface unit 3 connected with the three-phase bus for connecting a voltage transformer of the medium-voltage switch cabinet;
the fault unit 4 is connected with the three-phase bus and used for controlling the medium-voltage to generate a ground fault;
the waveform acquisition unit 5 is connected with the three-phase bus and used for acquiring a voltage waveform of the medium voltage;
and a protection unit 6 for preventing the medium voltage output from flowing through the three-phase bus.
In this embodiment, first, the first voltage converting unit 1 converts three-phase commercial power into medium voltage and outputs the medium voltage at the output terminal of the first voltage converting unit 1; then, the size of the grounding capacitance of the real medium-voltage power plant system is simulated through the equivalent capacitance unit 2, so that the detection work can be performed without connecting a medium-voltage cable in the real medium-voltage power plant system, and the detection accuracy is improved by connecting the voltage transformer of the medium-voltage switch cabinet in the medium-voltage power plant system through the interface unit 3, so that the real working condition of the medium-voltage power plant system is restored as much as possible; then, the fault unit 4 is used for controlling the medium voltage to generate a ground fault so as to excite the medium voltage station service electric system to generate ferromagnetic resonance; finally, the waveform collecting unit 5 collects the voltage waveform of the medium voltage, so that a worker can judge the ferromagnetic resonance characteristic of the medium voltage power system by observing the voltage waveform.
In a preferred embodiment, as shown in fig. 2, the ferromagnetic resonance detection circuit of the electric system for medium voltage factories further comprises a protection unit 6 for preventing the output of medium voltage from flowing. The protection unit 6 is connected to the output of the first voltage converting unit 1.
Further, in one specific embodiment, as shown in fig. 2, the protection unit 6 includes a first arrester F1, a second arrester F2, and a third arrester F3; the first lightning arrester F1 is connected with a first phase line in the three-phase bus, the second lightning arrester F2 is connected with a second phase line in the three-phase bus, and the third lightning arrester F3 is connected with a third phase line in the three-phase bus.
In the embodiment, by arranging the lightning arresters to the ground on the first phase line, the second phase line and the third phase line respectively, the overcurrent of any phase line output of the medium voltage can be prevented, and therefore the equipment connected with the phase lines is effectively prevented from being damaged due to the overcurrent.
In some embodiments, as shown in fig. 2, the fault unit 4 comprises a switch KM; the first end of the switch KM is connected with one phase line of the three-phase bus, and the second end of the switch KM is grounded.
In this embodiment, a worker may conduct one of the phase lines of the three-phase bus through the switch KM to ground, so that the medium voltage power system may have a ground fault or an intermittent ground fault, and the voltage waveform of the medium voltage output may generate a certain amount of harmonics, and some of the harmonics may be multiplied or amplified due to matching with the resonance characteristic of the medium voltage power system, that is, generate ferromagnetic resonance.
Optionally, the switch KM is a circuit breaker or a contactor.
In some embodiments, as shown in fig. 2, the waveform acquisition unit 5 includes a second voltage conversion unit 51 and a recorder LBY. An input end of the second voltage conversion unit 51 is connected to the three-phase bus, and an output end of the second voltage conversion unit 51 is connected to the recorder LBY.
In this embodiment, since the medium voltage is generally up to 6.6KV, the existing recorder will be damaged by overvoltage if directly collecting, so the voltage of the three-phase bus needs to be reduced to a predetermined ac voltage by the second voltage conversion unit 51, so that the recorder LBY can be coupled with the three-phase bus through the second voltage conversion unit 51, and thus collect the voltage waveform of the three-phase bus.
In some embodiments, as shown in fig. 2, the second voltage converting unit 51 includes a second transformer TV0. The primary side of the second transformer TV0 is connected to the three-phase bus, and the secondary side of the second transformer TV0 is connected to the recorder LBY.
In some embodiments, as shown in fig. 2, the first voltage converting unit 1 includes a first transformer T and a first circuit breaker QF1. The primary side of the first transformer T is connected with the output end of the first breaker QF1, the input end of the first breaker QF1 is the input end of the first voltage conversion unit 1, and the secondary side of the first transformer T is the output end of the first voltage conversion unit 1.
In this embodiment, the first circuit breaker QF1 is used to control whether three-phase utility power is input to the primary side of the first transformer T, and when three-phase utility power is input to the primary side of the first transformer T, the first transformer T boosts the three-phase utility power to a medium voltage and outputs the medium voltage through the secondary side of the first transformer T to the outside.
In some embodiments, as shown in fig. 2, the equivalent capacitance unit 2 comprises several capacitance setting units 21 for setting the equivalent capacitance to ground of the medium voltage utility system. Each capacitance setting unit 21 is connected to a three-phase bus.
In this embodiment, the staff can set each capacitance setting unit 21 according to the size of the capacitance to ground of the real medium voltage power system to simulate the grounding equivalent capacitance of the medium voltage power system, so that the circuit of the utility model can simulate the real working scene of the medium voltage power system as much as possible to improve the reliability of the detection result.
In some embodiments, as shown in fig. 2, the equivalent capacitance values set by the capacitance setting units 21 are different, so as to provide diversified capacitance setting selections for the staff member, thereby simplifying the operation of setting the equivalent capacitance value by the staff member.
In some embodiments, as shown in fig. 2, each capacitive value cell 21 includes three capacitive value loops 211. The input ends of the three capacitance setting value loops 211 are sequentially connected with a first phase line, a second phase line and a third phase line in the three-phase bus; wherein each capacitive setting loop 211 comprises a first capacitance C5 and a second circuit breaker QS5; after the first capacitor C5 and the second circuit breaker QS5 are connected in series, a series circuit is formed, a first end of the series circuit is an input end of the capacitor setting circuit 211, and a second end of the series circuit is grounded.
In this embodiment, when a certain second circuit breaker QS5 is closed, a first capacitor C5 connected to the second circuit breaker QS5 and a phase line form a path, that is, a capacitance to ground is added to the phase line (the added value is equal to the capacitance of the first capacitor C5), otherwise, when the second circuit breaker QS5 is closed, a capacitance to ground is not added to the phase line; therefore, a tester can realize the setting of the equivalent capacitance to the ground of the medium-voltage power plant system by controlling each second breaker QS 5.
In some embodiments, as shown in fig. 2, the number of capacitive setting cells 21 is seven.
Because of the wide power supply range of the medium voltage power plant system, the total length of the medium voltage cable of the medium voltage power plant system is very long, so that the capacitance to ground of the medium voltage power plant system is large (up to 9 μf in some nuclear power plants), in some embodiments, the capacitance value of the first capacitor C5 in the seven capacitance setting units 21 is 0.1 μf, 0.2 μf, 0.5 μf, 1 μf, 2 μf, and 4 μf, respectively. Note that, in this embodiment, the capacitance value of the first capacitor C5 in the same capacitance setting unit 21 is equal.
In some embodiments, the interface unit 3 comprises several cable joints. The three-phase input end of each cable connector is connected with a three-phase bus, and the three-phase output end of each cable connector is used for being connected with a voltage transformer of the medium-voltage switch cabinet.
The utility model also provides a ferromagnetic resonance detection device of the medium-voltage power system for the plant, which comprises the ferromagnetic resonance detection circuit of the medium-voltage power system for the plant provided by the embodiment of the utility model.
The beneficial effects of the utility model are as follows: providing a ferromagnetic resonance detection circuit of a medium-voltage station power system; a first voltage conversion unit for converting the three-phase mains supply into medium voltage through the first voltage conversion unit and outputting the medium voltage; then, simulating the equivalent capacitance to the ground of the medium voltage station power system through an equivalent capacitance unit, and connecting a voltage transformer for connecting the medium voltage switch cabinet through an interface unit; then the fault unit is used for controlling the medium voltage to generate a ground fault so as to excite the medium voltage station service electric system to generate ferromagnetic resonance; and finally, the voltage waveform of the medium voltage is acquired by the waveform acquisition unit, so that a worker can judge the ferromagnetic resonance characteristic of the medium voltage power plant system by observing the voltage waveform, the worker can correspondingly adjust the existing resonance elimination measures, the reliability of the medium voltage power plant system is improved, and the stability and the safety of the nuclear power plant are further improved.
It is to be understood that the above examples only represent preferred embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the utility model; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the utility model; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (10)
1. The utility model provides a medium voltage power consumption system ferromagnetic resonance detection circuit which characterized in that includes:
the first voltage conversion unit (1) is used for converting three-phase mains supply into medium voltage, the input end of the first voltage conversion unit is used for being connected with the three-phase mains supply, and the output end of the first voltage conversion unit is connected with a three-phase bus;
the equivalent capacitance unit (2) is connected with the three-phase bus and used for simulating the equivalent capacitance to the ground of the medium-voltage station power system;
an interface unit (3) connected with the three-phase bus for connecting a voltage transformer of a medium-voltage switch cabinet;
the fault unit (4) is connected with the three-phase bus and used for controlling the medium-voltage to generate a ground fault;
and the waveform acquisition unit (5) is connected with the three-phase bus and used for acquiring the voltage waveform of the medium voltage.
2. A medium voltage electrical system ferroresonance detection circuit according to claim 1, further comprising a protection unit (6) for preventing the medium voltage output from flowing through; the protection unit (6) is connected with the output end of the first voltage conversion unit (1).
3. A medium voltage electrical service system ferromagnetic resonance detection circuit according to claim 2, characterized in that the protection unit (6) comprises a first arrester F1, a second arrester F2 and a third arrester F3; the first lightning arrester F1 is connected with a first phase line in the three-phase bus, the second lightning arrester F2 is connected with a second phase line in the three-phase bus, and the third lightning arrester F3 is connected with a third phase line in the three-phase bus.
4. A medium voltage power plant system ferromagnetic resonance detection circuit according to claim 1, characterized in that the waveform acquisition unit (5) comprises a second voltage conversion unit (51) and a recorder LBY;
the input end of the second voltage conversion unit (51) is connected with the three-phase bus, and the output end of the second voltage conversion unit (51) is connected with the recorder LBY.
5. A medium voltage utility power system ferroresonance detection circuit according to claim 1, characterized in that the first voltage conversion unit (1) comprises a first transformer T and a first circuit breaker QF1; the primary side of the first transformer T is connected with the output end of the first breaker QF1, the input end of the first breaker QF1 is the input end of the first voltage conversion unit (1), and the secondary side of the first transformer T is the output end of the first voltage conversion unit (1).
6. A medium voltage electric system ferromagnetic resonance detection circuit according to any of claims 1-5, characterized in that the equivalent capacitance unit (2) comprises several capacitance setting units (21) for setting the magnitude of the equivalent capacitance to ground of the medium voltage electric system; each capacitance setting unit (21) is connected with the three-phase bus.
7. A ferromagnetic resonance detection circuit for a medium voltage electric system according to claim 6, characterized in that the equivalent capacitance value set by each of the capacitance setting units (21) is different.
8. A medium voltage electrical service system ferromagnetic resonance detection circuit according to claim 6, characterized in that each of said capacitive value-setting units (21) comprises three capacitive value-setting loops (211); the input ends of the three capacitance setting loops (211) are sequentially connected with a first phase line, a second phase line and a third phase line in the three-phase bus;
wherein each of said capacitive value-setting loops (211) comprises a first capacitance C5 and a second circuit breaker QS5; after the first capacitor C5 and the second breaker QS5 are connected in series, a series circuit is formed, a first end of the series circuit is an input end of the capacitor setting circuit (211), and a second end of the series circuit is grounded.
9. A medium voltage electrical system ferroresonance detection circuit according to claim 8, wherein the number of capacitive value units (21) is seven.
10. A device for detecting ferroresonance of a medium voltage power plant system, comprising the ferroresonance detection circuit of the medium voltage power plant system according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320093942.3U CN219201803U (en) | 2023-01-31 | 2023-01-31 | Ferromagnetic resonance detection circuit and device for medium-voltage power plant system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320093942.3U CN219201803U (en) | 2023-01-31 | 2023-01-31 | Ferromagnetic resonance detection circuit and device for medium-voltage power plant system |
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| CN219201803U true CN219201803U (en) | 2023-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320093942.3U Active CN219201803U (en) | 2023-01-31 | 2023-01-31 | Ferromagnetic resonance detection circuit and device for medium-voltage power plant system |
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| CN (1) | CN219201803U (en) |
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2023
- 2023-01-31 CN CN202320093942.3U patent/CN219201803U/en active Active
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