CN112505421A - Measuring circuit for direct current resistance of dry-type air-core reactor - Google Patents
Measuring circuit for direct current resistance of dry-type air-core reactor Download PDFInfo
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- CN112505421A CN112505421A CN202011280024.9A CN202011280024A CN112505421A CN 112505421 A CN112505421 A CN 112505421A CN 202011280024 A CN202011280024 A CN 202011280024A CN 112505421 A CN112505421 A CN 112505421A
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- 238000005259 measurement Methods 0.000 claims abstract description 36
- 239000003990 capacitor Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 238000012360 testing method Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 230000008030 elimination Effects 0.000 description 4
- 238000003379 elimination reaction Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
- G01R17/10—AC or DC measuring bridges
- G01R17/105—AC or DC measuring bridges for measuring impedance or resistance
Abstract
The invention discloses a measuring circuit of direct current resistance of a dry-type air-core reactor, which comprises: the device comprises a measured reactor, an alternating current signal eliminating module and a resistance measuring circuit; the measured reactor comprises a first end and a second end; the alternating current signal eliminating module comprises an input end and an output end, the input end of the alternating current signal eliminating module is connected with the second end of the electric reactor to be detected, and the output end of the alternating current signal eliminating module is connected with the first end of the electric reactor to be detected and is used for eliminating alternating current signals passing through the electric reactor to be detected; and the resistance measuring circuit is connected with the first end and the second end of the measured reactor and is used for measuring the direct current resistance of the measured reactor. The invention reduces the influence of the space magnetic field on the measurement result of the direct current resistance of the dry-type air-core reactor, and achieves the effects of more accurate and convenient measurement and lower cost.
Description
Technical Field
The embodiment of the invention relates to the detection technology of an electric power system, in particular to a measuring circuit for direct current resistance of a dry type air reactor.
Background
In the use process of the dry-type air-core reactor, the direct-current resistance test of the winding needs to be carried out regularly. In the direct current resistance test process of the dry-type air reactor, the tested reactor is easily influenced by a surrounding alternating magnetic field to generate alternating induced potential, and alternating induced current is formed in a loop under the action of induced electromotive force to influence the direct current resistance measurement result.
At the present stage, in order to reduce the influence of the space magnetic field on the test result, the test current is often increased for testing, and the magnetic saturation is formed in the reactor which is stopped by increasing the test current, so that the induced current generated in the coil of the reactor is reduced, the influence of the alternating magnetic field generated around the reactor which is operated is inhibited, and the influence of the magnetic field on the test result is reduced. However, as the output current of the instrument increases, the higher the cost of the instrument, the higher the cost, and the inconvenience of field testing.
Disclosure of Invention
The embodiment of the invention provides a measuring circuit for the direct current resistance of a dry-type air-core reactor, which reduces the influence of a space magnetic field on the measuring result of the direct current resistance of the dry-type air-core reactor and achieves the effects of more accurate and convenient measurement and lower cost.
The embodiment of the invention provides a measuring circuit for direct current resistance of a dry-type air-core reactor, which comprises: the device comprises a measured reactor, an alternating current signal eliminating module and a resistance measuring circuit; the measured reactor comprises a first end and a second end; the alternating current signal eliminating module comprises an input end and an output end, the input end of the alternating current signal eliminating module is connected with the second end of the electric reactor to be detected, and the output end of the alternating current signal eliminating module is connected with the first end of the electric reactor to be detected and is used for eliminating alternating current signals passing through the electric reactor to be detected; and the resistance measuring circuit is connected with the first end and the second end of the measured reactor and is used for measuring the direct current resistance of the measured reactor.
Optionally, the difference between the phases of the ac signals at the input end and the output end of the ac signal cancellation module is 180 degrees.
Optionally, the ac signal cancellation module includes: the circuit comprises a capacitor, an amplifier, a first resistor and a second resistor; the inverting input end of the amplifier is connected with the first end of the first resistor through the capacitor, and the second end of the first resistor is used as the input end of the alternating-current signal eliminating module and is connected with the second end of the measured reactor; the positive input end of the amplifier is grounded; the output end of the amplifier is used as the output end of the alternating-current signal eliminating module and is connected with the first end of the reactor to be tested; and two ends of the second resistor are respectively connected with the positive input end and the output end of the amplifier.
Optionally, the resistance measurement circuit includes: the power supply, the first switch, the ammeter, the bridge circuit, the third resistor and the fourth resistor; the first switch and the ammeter are connected in series between the first end of the third resistor and the negative electrode of the power supply, the positive electrode of the power supply is connected with the first end of the measured reactor, and the connection point is a first connection point; the second end of the third resistor is connected with the second end of the fourth resistor, and the connection point is a fourth connection point; the first end of the fourth resistor is connected with the second end of the measured reactor, the connection point of the connecting line and the first end of the fourth resistor is a third connection point, and the connection point of the connecting line and the second end of the measured reactor is a second connection point; the first end of the bridge circuit is connected with the first end of the measured reactor, and the connection point is a fifth connection point; the second end of the bridge circuit is connected with the second end of the measured reactor, and the connection point is a sixth connection point; the third end of the bridge circuit is connected with the first end of the fourth resistor, and the connection point is a seventh connection point; and the fourth end of the bridge circuit is connected with the second end of the fourth resistor, and the connection point is an eighth connection point.
Optionally, the first and second connection points are at a greater distance from the measured reactor than the fifth and sixth connection points; the third connecting point and the fourth connecting point are farther from the fourth resistor than the seventh connecting point and the eighth connecting point are from the measured reactor.
Optionally, the third resistor is a variable resistor.
Optionally, the fourth resistor is a standard resistor.
Optionally, the bridge circuit comprises: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a galvanometer and a second switch; the fifth resistor, the sixth resistor, the seventh resistor and the eighth resistor are variable resistors, a first end of the fifth resistor is used as a first end of the bridge circuit, and a second end of the fifth resistor is connected with a first end of the galvanometer; a first end of the sixth resistor is used as a second end of the bridge circuit, and a second end of the sixth resistor is connected with a second end of the second switch; a first end of the seventh resistor is connected to a second end of the second switch, and a second end of the seventh resistor is used as a third end of the bridge circuit; a first end of the eighth resistor is connected with a first end of the galvanometer, and a second end of the eighth resistor is used as a fourth end of the bridge circuit; a second terminal of the galvanometer is connected to a first terminal of the second switch.
Optionally, the fifth resistor and the sixth resistor and the seventh resistor and the eighth resistor are coaxial adjusting resistors.
According to the embodiment of the invention, the alternating current signal eliminating modules are arranged at the two ends of the measured reactor, the amplitude of the alternating current signal output from the measured reactor is amplified, the phase +/-180 degrees is input into the measured reactor, and the alternating current signal in the measured reactor is offset, so that the interference of the alternating current signal in the process of measuring the resistance of the dry type air reactor can be eliminated by adopting simple measuring equipment, and the effects of more accuracy, convenience and lower cost in measuring the direct current resistance of the reactor are achieved.
Drawings
Fig. 1 is a schematic diagram of a measurement circuit for dc resistance of a dry air reactor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a measurement circuit of direct current resistance of another dry-type air-core reactor provided by the embodiment of the invention;
FIG. 3 is a schematic diagram of a measurement circuit of DC resistance of another dry-type air-core reactor provided by the embodiment of the invention;
fig. 4 is a circuit diagram of another measurement circuit for the direct current resistance of the dry air reactor according to the embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the present invention provides a measurement circuit for a direct current resistance of a dry-type air-core reactor, and fig. 1 is a schematic diagram of the measurement circuit for the direct current resistance of the dry-type air-core reactor provided by the embodiment of the present invention, and referring to fig. 1, the measurement circuit includes: the measured reactor 110, the alternating current signal eliminating module 120 and the resistance measuring circuit 130; a measured reactor 110 comprising a first end 111, a second end 112; the alternating current signal eliminating module 120 comprises an input end 121 and an output end 122, the input end 121 of the alternating current signal eliminating module 120 is connected with the second end 112 of the measured reactor 110, and the output end 122 of the alternating current signal eliminating module 120 is connected with the first end 111 of the measured reactor 110, and is used for eliminating alternating current signals passing through the measured reactor 110; and the resistance measuring circuit 130 is connected with the first end 111 and the second end 112 of the measured reactor 110 and is used for measuring the direct current resistance of the measured reactor 110.
The measured reactor 110 is a dry air-core reactor, and is a reactor measured by the measuring circuit, a signal is input into the measured reactor 110 through a first end 111 of the measured reactor 110, and is output to the measured reactor 110 through a second end 112 of the measured reactor 110; the phase difference between the ac signals at the input end 121 and the output end 122 of the ac signal cancellation module 120 is 180 degrees; the ac signal cancellation module 120 extracts an ac signal from the second end 112 of the reactor under test 110 through the input end 121, amplifies the ac signal to have an amplitude similar to that of the ac signal in the reactor under test 110, and retransmits the phase change of the ac signal by ± 180 degrees to the reactor under test 110 through the output end to cancel the ac signal in the reactor under test 110; the resistance measurement circuit 130 is a circuit that measures the direct current resistance of the measured reactor 110, and for example, the resistance measurement circuit 130 may measure the direct current resistance of the measured reactor 110 by using the double-arm bridge principle.
According to the embodiment of the invention, the alternating current signal eliminating modules 120 are arranged at the two ends of the measured reactor 110, the amplitude of the alternating current signal output from the measured reactor 110 is amplified, the phase +/-180 degrees is input into the measured reactor 110, and the alternating current signal in the phase is offset, so that the interference of the alternating current signal in the process of measuring the resistance of the dry type air reactor can be eliminated by adopting simple measuring equipment, and the effects of more accuracy, convenience and lower cost in measuring the direct current resistance of the reactor are achieved.
Fig. 2 is a schematic diagram of a measurement circuit for dc resistance of a dry air reactor according to an embodiment of the present invention, referring to fig. 2, optionally, the ac signal cancellation module 120 includes: the circuit comprises a capacitor 221, an amplifier 222, a first resistor R1 and a second resistor R2.
The amplifier 222 may be an inverting amplifier 222, the phase difference between the input ac signal and the output ac signal is 180 degrees, and an inverting input 223 of the amplifier 222 is used as the ac signal input; the second resistor R2 is the feedback resistor of the inverting amplifier 222; the capacitor 221 is used for isolating a direct current signal from signals input from the input end 121 of the alternating current signal elimination module and only allowing the alternating current signal to be input into the alternating current signal elimination module 120; the inverting input terminal 223 of the amplifier 222 is connected to the first terminal 225 of the first resistor R1 through the capacitor 221, and the second terminal of the first resistor R1 is connected to the second terminal 112 of the measured reactor 110 as the input terminal 121 of the ac signal cancellation module 120; the positive input 224 of amplifier 222 is connected to ground; the output end of the amplifier 222 is used as the output end 122 of the ac signal cancellation module 120, and is connected to the first end 111 of the measured reactor 110; the two ends of the second resistor R2 are connected to the positive input terminal 224 and the output terminal of the amplifier 222, respectively.
Illustratively, in the process of measuring the direct current reactance of the measured reactor 110, a voltage is applied to two ends of the measured reactor 110, the measured reactor 110 is influenced by the induced magnetic field of the adjacent operating reactor and can generate an alternating induced potential, a signal output from the second end 112 of the measured reactor 110 is input into the alternating signal elimination module 120 through the input end 121 of the alternating signal elimination module 120, the direct current signal is isolated through the capacitor 221, only the alternating signal is input to the reverse input end 223 of the amplifier 222, the amplifier 222 changes the phase of the alternating signal by 180 degrees, the amplitude is increased to be the same as the amplitude of the alternating signal in the measured reactor 110, and the alternating signal is output to the measured reactor 110 and is superposed and offset with the alternating signal in the measured reactor 110. The measuring circuit of the direct current resistance of the dry-type air reactor provided by the embodiment of the invention offsets the alternating current signal in the measured reactor 110, improves the measuring precision, reduces the measuring cost and realizes the effect of convenient and accurate measurement.
Fig. 3 is a schematic diagram of a measurement circuit for dc resistance of a dry air reactor according to an embodiment of the present invention, referring to fig. 3, optionally, the resistance measurement circuit 130 includes: a power supply 301, a first switch 302, a current meter 303, a bridge circuit 304, a third resistor R3, and a fourth resistor R4.
The first switch 302 and the current meter 303 are connected in series between the first end 305 of the third resistor R3 and the negative electrode of the power supply 301, the positive electrode of the power supply 301 is connected to the first end 111 of the measured reactor 110, and the connection point is a first connection point C1; the third resistor R3 is a variable resistor; the second end 306 of the third resistor R3 is connected to the second end 307 of the fourth resistor R4, and the connection point is a fourth connection point C4; the first end 308 of the fourth resistor R4 is connected with the second end 112 of the measured reactor 110, the connection point of the connection line and the first end 308 of the fourth resistor R4 is a third connection point C3, and the connection point of the connection line and the second end 112 of the measured reactor 110 is a second connection point C2; the first end 309 of the bridge circuit 304 is connected to the first end 111 of the measured reactor 110, and the connection point is a fifth connection point P1; the second end 310 of the bridge circuit 304 is connected to the second end 112 of the measured reactor 110, and the connection point is a sixth connection point P2; the third terminal 311 of the bridge circuit 304 is connected to the first terminal 308 of the fourth resistor R4, and the connection point is a seventh connection point P3; the fourth terminal 312 of the bridge circuit 304 is connected to the second terminal 307 of the fourth resistor R4, and the connection point is an eighth connection point P4; the distance between the first connecting point C1 and the second connecting point C2 and the measured reactor 110 is larger than the distance between the fifth connecting point P1 and the sixth connecting point P2 and the measured reactor 110; the distance between the third connection point C3 and the fourth connection point C4 and the fourth resistor R4 is larger than the distance between the seventh connection point P3 and the eighth connection point P4 and the measured reactor 110; the third resistor R3 is a variable resistor; the fourth resistor R4 is a standard resistor.
For example, in the process of measuring the direct current resistance of the measured reactor 110, the measuring circuit may use a low resistance tester based on a double-arm bridge principle, such as a SB-82 type double-arm bridge, the first connection point C1 and the second connection point C2 of the measuring circuit are current connection points of the measured reactor 110, the distance between the first connection point C1 and the second connection point C2 of the measuring circuit and the current connection points of the measured reactor 110 is greater than the distance between the fifth connection point P1 and the sixth connection point P2 of the measured reactor 110, and the fifth connection point P1 and the sixth connection point P2 are voltage connection points of the measured reactor 110; the distance between the third connection point C3 and the fourth connection point C4 in the measuring circuit and the fourth resistor R4 is larger than the distance between the seventh connection point P3 and the eighth connection point P4 and the fourth resistor R4, and the influence of the connection resistance on the measuring result in the measuring process can be reduced by the reactor to be measured and the fourth resistor R4 which are in the four-terminal connection method. The measurement circuit of the direct current resistance of the dry-type air-core reactor provided by the embodiment of the invention offsets the alternating current signal in the measured reactor 110, reduces the influence of the wiring resistance on the measurement result by utilizing the bridge circuit 304 and the four-terminal connection method, improves the measurement precision, reduces the measurement cost and realizes the effect of convenient and accurate measurement.
Fig. 4 is a circuit diagram of another dry air reactor dc resistance measurement circuit according to an embodiment of the present invention, and referring to fig. 4, the bridge circuit 304 optionally includes: a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a galvanometer 401, and a second switch 402.
The fifth resistor R5, the sixth resistor R6, the seventh resistor R7 and the eighth resistor R8 are variable resistors, the minimum resistance values are all larger than 10 Ω, the first end of the fifth resistor R5 is used as the first end 309 of the bridge circuit 304, and the second end of the fifth resistor R5 is connected with the first end of the galvanometer 401; a first terminal of the sixth resistor R6 is used as the second terminal 310 of the bridge circuit 304, and a second terminal of the sixth resistor R6 is connected to the second terminal of the second switch 402; a first end of the seventh resistor R7 is connected to the second end of the second switch 402, and a second end of the seventh resistor R7 serves as the third end 311 of the bridge circuit 304; a first terminal of the eighth resistor R8 is connected to the first terminal of the galvanometer 401, and a second terminal of the eighth resistor R8 is used as the fourth terminal 312 of the bridge circuit 304; a second terminal of the galvanometer 401 is connected to a first terminal of a second switch 402; the fifth resistor R5 and the sixth resistor R6, and the seventh resistor R7 and the eighth resistor R8 are set as coaxial adjusting resistors, and in the measurement process, resistance values of the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 of each bridge arm resistor are adjusted to make the current of the galvanometer 401 be 0, and it is ensured that minimum resistance values of the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 are all greater than 10 Ω, and R5/R6 is R8/R7, so that the direct current resistance of the measured reactor 110 is (R5/R8) × R4.
Illustratively, the measuring circuit may employ a double-arm bridge circuit 304, wherein the fifth resistor R5 and the sixth resistor R6, and the seventh resistor R7 and the eighth resistor R8 are coaxially adjusted resistors, so that while the fifth resistor R5 and the eighth resistor R8 are changed, the sixth resistor R6 and the seventh resistor R7 are also changed, and R5/R6 is always kept equal to R8/R7, during the process of measuring the dc resistance of the reactor under test, the bridge is balanced by adjusting the resistances of the respective arms, and at this time, the current of the galvanometer 401 is 0, and the dc resistance of the measured reactor 110 is (R5/R8) R4.
The measuring circuit of the direct-current resistance of the dry-type air reactor provided by the embodiment of the invention offsets alternating-current signals in the measured reactor, reduces the influence of the wiring resistance on the measuring result by utilizing the double-arm bridge circuit and the four-terminal connection method, improves the measuring precision, reduces the measuring cost and realizes the effect of convenient and accurate measurement.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. A measurement circuit of direct current resistance of a dry type air-core reactor is characterized by comprising the following components:
the measured reactor comprises a first end and a second end;
the alternating current signal eliminating module comprises an input end and an output end, the input end of the alternating current signal eliminating module is connected with the second end of the electric reactor to be tested, and the output end of the alternating current signal eliminating module is connected with the first end of the electric reactor to be tested and is used for eliminating alternating current signals passing through the electric reactor to be tested;
and the resistance measuring circuit is connected with the first end and the second end of the measured reactor and is used for measuring the direct current resistance of the measured reactor.
2. A measurement circuit for dc resistance of a dry-type air-core reactor according to claim 1, wherein the difference between the phases of the ac signals at the input and output terminals of the ac signal cancellation module is 180 degrees.
3. A measurement circuit of dc resistance of a dry-type air-core reactor according to claim 1, wherein the ac signal removing module comprises: the circuit comprises a capacitor, an amplifier, a first resistor and a second resistor;
the inverting input end of the amplifier is connected with the first end of the first resistor through the capacitor, and the second end of the first resistor is used as the input end of the alternating-current signal eliminating module and is connected with the second end of the measured reactor; the positive input end of the amplifier is grounded; the output end of the amplifier is used as the output end of the alternating-current signal eliminating module and is connected with the first end of the reactor to be tested; and two ends of the second resistor are respectively connected with the positive input end and the output end of the amplifier.
4. A measurement circuit of direct current resistance of a dry-type air-core reactor according to claim 1, wherein the resistance measurement circuit comprises: the power supply, the first switch, the ammeter, the bridge circuit, the third resistor and the fourth resistor;
the first switch and the ammeter are connected in series between the first end of the third resistor and the negative electrode of the power supply, the positive electrode of the power supply is connected with the first end of the measured reactor, and the connection point is a first connection point; the second end of the third resistor is connected with the second end of the fourth resistor, and the connection point is a fourth connection point; the first end of the fourth resistor is connected with the second end of the measured reactor, the connection point of the connecting line and the first end of the fourth resistor is a third connection point, and the connection point of the connecting line and the second end of the measured reactor is a second connection point; the first end of the bridge circuit is connected with the first end of the measured reactor, and the connection point is a fifth connection point; the second end of the bridge circuit is connected with the second end of the measured reactor, and the connection point is a sixth connection point; the third end of the bridge circuit is connected with the first end of the fourth resistor, and the connection point is a seventh connection point; and the fourth end of the bridge circuit is connected with the second end of the fourth resistor, and the connection point is an eighth connection point.
5. A measurement circuit of direct current resistance of a dry-type air-core reactor according to claim 4, characterized in that the distance between the first connection point and the second connection point from the measured reactor is larger than the distance between the fifth connection point and the sixth connection point from the measured reactor; the third connecting point and the fourth connecting point are farther from the fourth resistor than the seventh connecting point and the eighth connecting point are from the measured reactor.
6. A measurement circuit for DC resistance of a dry-type air-core reactor according to claim 4, characterized in that the third resistance is a variable resistance.
7. A measurement circuit for DC resistance of a dry-type air-core reactor as claimed in claim 4, characterized in that the fourth resistance is a standard resistance.
8. A measurement circuit for DC resistance of a dry-type air-core reactor according to claim 4, wherein the bridge circuit comprises: a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a galvanometer and a second switch;
the fifth resistor, the sixth resistor, the seventh resistor and the eighth resistor are variable resistors, a first end of the fifth resistor is used as a first end of the bridge circuit, and a second end of the fifth resistor is connected with a first end of the galvanometer; a first end of the sixth resistor is used as a second end of the bridge circuit, and a second end of the sixth resistor is connected with a second end of the second switch; a first end of the seventh resistor is connected to a second end of the second switch, and a second end of the seventh resistor is used as a third end of the bridge circuit; a first end of the eighth resistor is connected with a first end of the galvanometer, and a second end of the eighth resistor is used as a fourth end of the bridge circuit; a second terminal of the galvanometer is connected to a first terminal of the second switch.
9. A measurement circuit for DC resistance of a dry-type air-core reactor according to claim 8, characterized in that the fifth and sixth resistances and the seventh and eighth resistances are coaxial adjusting resistances.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011280024.9A CN112505421A (en) | 2020-11-16 | 2020-11-16 | Measuring circuit for direct current resistance of dry-type air-core reactor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011280024.9A CN112505421A (en) | 2020-11-16 | 2020-11-16 | Measuring circuit for direct current resistance of dry-type air-core reactor |
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| CN112505421A true CN112505421A (en) | 2021-03-16 |
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| CN202011280024.9A Pending CN112505421A (en) | 2020-11-16 | 2020-11-16 | Measuring circuit for direct current resistance of dry-type air-core reactor |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204065240U (en) * | 2014-05-07 | 2014-12-31 | 国家电网公司 | A kind of dry reactor performance test circuit and device |
| CN109142876A (en) * | 2018-10-31 | 2019-01-04 | 于创宇 | Resistance measuring circuit and resistivity-measuring devices |
| CN109946506A (en) * | 2019-04-16 | 2019-06-28 | 深圳市闿思科技有限公司 | Zero-crossing detection system |
| CN110031677A (en) * | 2019-01-25 | 2019-07-19 | 哈尔滨理工大学 | Dry-type air-core reactor scene impedance measuring circuit and detection method |
-
2020
- 2020-11-16 CN CN202011280024.9A patent/CN112505421A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204065240U (en) * | 2014-05-07 | 2014-12-31 | 国家电网公司 | A kind of dry reactor performance test circuit and device |
| CN109142876A (en) * | 2018-10-31 | 2019-01-04 | 于创宇 | Resistance measuring circuit and resistivity-measuring devices |
| CN110031677A (en) * | 2019-01-25 | 2019-07-19 | 哈尔滨理工大学 | Dry-type air-core reactor scene impedance measuring circuit and detection method |
| CN109946506A (en) * | 2019-04-16 | 2019-06-28 | 深圳市闿思科技有限公司 | Zero-crossing detection system |
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