CN110988751A - Circuit and method for detecting turn-to-turn short circuit fault of reactor - Google Patents
Circuit and method for detecting turn-to-turn short circuit fault of reactor Download PDFInfo
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- CN110988751A CN110988751A CN201911247194.4A CN201911247194A CN110988751A CN 110988751 A CN110988751 A CN 110988751A CN 201911247194 A CN201911247194 A CN 201911247194A CN 110988751 A CN110988751 A CN 110988751A
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Abstract
The invention discloses a circuit and a method for detecting turn-to-turn short circuit faults of a reactor, wherein the circuit comprises a power supply, a switch, a voltage transformer, a current transformer, the reactor, a capacitor and a power factor measuring module, the power factor measuring module comprises a high-resolution power factor measuring device and a server, the high-resolution power factor measuring device and the server are communicated through a network cable, a primary winding of the voltage transformer is connected to two ends of the power supply and is connected with the reactor in parallel, and a secondary winding is connected to the high-resolution power factor measuring device; a primary winding of the current transformer is connected to two ends of the power supply and is connected with the reactor in series, and a secondary winding of the current transformer is connected to the high-resolution power factor measuring device; the reactor is connected with the capacitor in parallel; the method is implemented by a circuit. The invention is sensitive and accurate, can ensure the operation safety, enables the reactor to operate under the rated voltage and avoids the negative influence caused by the deviation of the integral measuring circuit.
Description
Technical Field
The invention belongs to the field of reactors, and particularly relates to a circuit and a method for detecting turn-to-turn short circuit faults of a reactor.
Background
The turn-to-turn short circuit fault is a fatal fault of the reactor, and the reactor with the turn-to-turn short circuit fault can be burnt or even open fire. At present, a common method for detecting a reactor and judging whether the reactor has a turn-to-turn short circuit fault by a power company is as follows: and measuring the direct current resistance or inductance value, comparing the measured value with the name plate value of the reactor, and judging that the reactor has a fault if the deviation exceeds the range specified by the standard. However, since the number of turns of the reactor coil is large, if a short-circuit fault occurs in only a very small number of turns (for example, only 1 turn), the dc resistance value and the inductance value variation of the reactor are extremely small, and the fault is hardly found.
Disclosure of Invention
In order to solve the above problems, the present invention provides a circuit and a method for detecting turn-to-turn short circuit fault of a reactor, which can ensure the safety of operators and instruments, and simultaneously, the reactor can operate under a rated voltage, and can accurately measure a rated power factor of the reactor, and determine whether the turn-to-turn short circuit fault occurs in the reactor, in order to achieve the above purpose, the technical scheme adopted by the present invention is as follows:
a circuit for detecting turn-to-turn short circuit faults of a reactor comprises a power supply, a switch, a voltage transformer, a current transformer, the reactor, a capacitor and a power factor measuring module, wherein the power factor measuring module comprises a high-resolution power factor measuring device and a server, the high-resolution power factor measuring device and the server are communicated through a network cable, a primary winding of the voltage transformer is connected to two ends of the power supply and connected with the reactor in parallel, and a secondary winding of the voltage transformer is connected to the high-resolution power factor measuring device; a primary winding of the current transformer is connected to two ends of the power supply and is connected with the reactor in series, and a secondary winding of the current transformer is connected to the high-resolution power factor measuring device; the reactor is connected in parallel with the capacitor.
Preferably, the high-resolution power factor measuring device is configured to collect a secondary winding side voltage of the voltage transformer and a secondary winding side current of the current transformer in the circuit, calculate a power factor of the reactor, and transmit a calculation result to the server through a network cable, where the server is connected to a display.
The optimization effect that this preferred scheme brought is that current transformer plays current transformation and electrical isolation effect, and the measurement of being convenient for, protection and control need be converted into more unified electric current.
Preferably, the rated voltage and rated capacity of the capacitor and the reactor are both equal.
Preferably, the high-resolution power factor measuring device is connected with a ground protection device.
A method for detecting turn-to-turn short circuit fault of a reactor adopts the circuit, and comprises the following steps:
calculating a rated power factor value, namely a calculated value, of the to-be-measured reactor according to the direct current resistance value, the inductance value, the rated voltage and the rated frequency on the nameplate of the to-be-measured reactor;
connecting the reactor to be tested into a circuit, applying rated voltage, and obtaining a power factor value, namely a measured value, of the reactor to be tested under the rated voltage;
and judging the numerical values of the calculated value and the measured value, and if the measured value is larger than the calculated value, judging that the reactor to be tested has turn-to-turn short circuit fault.
Preferably, the step of obtaining the measurement value comprises:
selecting a standard reactor which has the same parameter with the reactor to be measured and has no fault, connecting the standard reactor into a circuit, applying rated voltage, and measuring the power factor of the standard reactor through the power factor measuring module;
the difference between the power factor of the standard reactor and the calculated value is the total deviation of the whole measuring circuit, namely the total deviation is the power factor-calculated value of the standard reactor;
connecting the reactor to be measured into a circuit, applying rated voltage, and measuring a power factor value of the reactor to be measured under the rated voltage as a primary measurement value;
subtracting the total deviation from the preliminary measurement value to obtain the measurement value, namely, measuring value-preliminary measurement value-total deviation.
Compared with the prior art, the invention has the beneficial effects that:
1. the circuit and the method for detecting the turn-to-turn short circuit fault of the reactor adopt a power factor comparison method to judge whether the reactor has the fault, the theoretical basis is an energy conservation principle, namely the loss value of the fault reactor is inevitably and greatly increased, the loss value has a definite mathematical relation with a power factor value, the power factor value is almost increased in equal proportion, the power factor value of the reactor to be detected is measured, and the reactor can be judged to have the turn-to-turn short circuit fault as long as the measured value is far larger than the power factor calculated value (rated power factor value) of the reactor, so that the method is more sensitive than the traditional method for judging whether the reactor has the turn-to-turn short circuit fault in the background technology.
2. The traditional method for measuring the power factor value of the reactor off line comprises the following steps: and directly measuring the power factor value of the reactor by using a power factor meter. However, considering the safety of the tester, the test voltage is very low (lower than 36V safety voltage), that is, the test voltage is far lower than the rated operation voltage of the reactor, and at such low voltage, even if the inter-turn short circuit fault occurs when the reactor operates at the rated voltage, the short circuit point is no longer short-circuited at the test voltage, and a normal insulation state is presented. The circuit for detecting the turn-to-turn short circuit fault of the reactor adopts a voltage transformer and a current transformer which are both provided with two windings, wherein the primary winding is connected on a circuit in parallel, and the secondary winding is connected with an instrument in parallel. When measuring the voltage on the high-voltage line, the secondary voltage is low despite the high primary voltage, so that the safety of the operator and the instrument can be ensured, and the reactor can be operated at the rated voltage.
3. According to the method for detecting the turn-to-turn short circuit fault of the reactor, the power factor measuring module is subjected to zero calibration through the standard reactor, the reactor is low-power factor equipment, a small power factor value can be accurately measured, and negative effects caused by phase angle difference of a voltage transformer and a current transformer and deviation of an overall measuring circuit are avoided.
Drawings
Fig. 1 is a schematic circuit diagram of a reactor for detecting turn-to-turn short circuit fault according to the present invention.
Wherein, 1, a power supply; 2. a switch; 3. a voltage transformer; 4. a current transformer; 5. a reactor; 6. a capacitor; 7. a high resolution power factor measurement device; 8. a server; 9. a display; 10. a network cable; 11. a ground protection device.
Detailed Description
For a better understanding of the present invention, the contents of the present invention will be further explained below with reference to the drawings and examples, but the present invention is not limited to the following examples.
Examples
Taking the detection of whether the reactor to be detected has turn-to-turn short circuit fault as an example:
(1) firstly, calculating a rated power factor value, namely a calculated value, of the reactor to be tested according to a direct current resistance value, an inductance value, a rated voltage and a rated frequency on a nameplate of the reactor to be tested;
(2) selecting a standard reactor which has the same parameter with the reactor to be measured and has no fault, connecting the standard reactor into a measuring circuit, applying rated voltage, and measuring the power factor of the standard reactor through a power factor measuring module;
the difference between the power factor of the standard reactor and the calculated value is the total deviation of the whole measuring circuit, namely the total deviation is the power factor-calculated value of the standard reactor.
The measuring circuit is shown in fig. 1 and comprises a power supply 1, a switch 2, a voltage transformer 3, a current transformer 4, a reactor 5, a capacitor 5 and a power factor measuring module, wherein the power factor measuring module comprises a high-resolution power factor measuring device 7 and a server 8, the high-resolution power factor measuring device 7 is communicated with the server 8 through a network cable 10, a primary winding of the voltage transformer 3 is connected to two ends of the power supply 1 and is connected with the reactor 5 in parallel, and a secondary winding is connected to the high-resolution power factor measuring device 7; a primary winding of a current transformer 4 is connected to two ends of a power supply 1 and is connected with a reactor 5 in series, and a secondary winding is connected to a high-resolution power factor measuring device 7; the reactor 5 is connected in parallel with the capacitor 6, and the rated voltage and the rated capacity of the capacitor 6 and the reactor 5 are equal. The high-resolution power factor measuring device 7 is used for collecting the secondary winding side voltage of the voltage transformer 3 and the secondary winding side current of the current transformer 4 in the circuit, calculating the power factor of the reactor 5, and transmitting the calculation result to the server 8 through the network cable 10, wherein the server 8 is connected with the display 9. The high-resolution power factor measuring device 7 is also connected with a ground protection device 11.
(3) Connecting a reactor to be measured into a measuring circuit, applying rated voltage, and obtaining a power factor value under the rated voltage of the reactor to be measured as a primary measured value;
the total deviation is subtracted from the preliminary measured value to obtain the measured value, i.e. the measured value is the preliminary measured value — the total deviation.
(4) And judging the numerical values of the calculated value and the measured value, and if the measured value is larger than the calculated value, judging that the reactor to be tested has turn-to-turn short circuit fault.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (6)
1. A circuit for detecting turn-to-turn short circuit faults of a reactor is characterized by comprising a power supply, a switch, a voltage transformer, a current transformer, the reactor, a capacitor and a power factor measuring module, wherein the power factor measuring module comprises a high-resolution power factor measuring device and a server, the high-resolution power factor measuring device and the server are communicated through a network cable, a primary winding of the voltage transformer is connected to two ends of the power supply and connected with the reactor in parallel, and a secondary winding is connected to the high-resolution power factor measuring device; a primary winding of the current transformer is connected to two ends of the power supply and is connected with the reactor in series, and a secondary winding of the current transformer is connected to the high-resolution power factor measuring device; the reactor is connected in parallel with the capacitor.
2. The circuit for detecting the turn-to-turn short circuit fault of the reactor as claimed in claim 1, wherein the high resolution power factor measuring device is configured to collect a secondary winding side voltage of the voltage transformer and a secondary winding side current of the current transformer in the circuit, calculate the power factor of the reactor, and transmit the calculation result to the server through a network cable, and the server is connected with a display.
3. The circuit for detecting a reactor turn-to-turn short circuit fault as claimed in claim 1, wherein the rated voltage and the rated capacity of the capacitor and the reactor are equal.
4. The circuit for detecting the turn-to-turn short circuit fault of the reactor as claimed in claim 1, wherein the high-resolution power factor measuring device is connected with a grounding protection device.
5. A method for detecting turn-to-turn short circuit fault of a reactor, which is characterized by using the circuit of any one of claims 1-4, and comprising the following steps:
calculating a rated power factor value, namely a calculated value, of the to-be-measured reactor according to the direct current resistance value, the inductance value, the rated voltage and the rated frequency on the nameplate of the to-be-measured reactor;
connecting the reactor to be tested into a circuit, applying rated voltage, and obtaining a power factor value, namely a measured value, of the reactor to be tested under the rated voltage;
and judging the numerical values of the calculated value and the measured value, and if the measured value is larger than the calculated value, judging that the reactor to be tested has turn-to-turn short circuit fault.
6. The method for detecting the turn-to-turn short circuit fault of the reactor according to claim 5, wherein the step of obtaining the measured value comprises:
selecting a standard reactor which has the same parameter with the reactor to be measured and has no fault, connecting the standard reactor into a circuit, applying rated voltage, and measuring the power factor of the standard reactor through the power factor measuring module;
the difference between the power factor of the standard reactor and the calculated value is the total deviation of the whole measuring circuit, namely the total deviation is the power factor-calculated value of the standard reactor;
connecting the reactor to be measured into a circuit, applying rated voltage, and measuring a power factor value of the reactor to be measured under the rated voltage as a primary measurement value;
subtracting the total deviation from the preliminary measurement value to obtain the measurement value, namely, measuring value-preliminary measurement value-total deviation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911247194.4A CN110988751A (en) | 2019-12-09 | 2019-12-09 | Circuit and method for detecting turn-to-turn short circuit fault of reactor |
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| CN201911247194.4A CN110988751A (en) | 2019-12-09 | 2019-12-09 | Circuit and method for detecting turn-to-turn short circuit fault of reactor |
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Application publication date: 20200410 |
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