CN107748320B - Inter-turn defect testing circuit and method for iron core reactor - Google Patents
Inter-turn defect testing circuit and method for iron core reactor Download PDFInfo
- Publication number
- CN107748320B CN107748320B CN201711146462.4A CN201711146462A CN107748320B CN 107748320 B CN107748320 B CN 107748320B CN 201711146462 A CN201711146462 A CN 201711146462A CN 107748320 B CN107748320 B CN 107748320B
- Authority
- CN
- China
- Prior art keywords
- test
- voltage
- reactor
- frequency
- turn
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 124
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 230000007547 defect Effects 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000003990 capacitor Substances 0.000 claims description 35
- 230000000737 periodic effect Effects 0.000 claims description 6
- 238000010998 test method Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 abstract description 15
- 238000004804 winding Methods 0.000 abstract description 14
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000009863 impact test Methods 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 230000001939 inductive effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1245—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of line insulators or spacers, e.g. ceramic overhead line cap insulators; of insulators in HV bushings
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Testing Relating To Insulation (AREA)
Abstract
The invention discloses a turn-to-turn defect testing circuit and method of an iron core reactor, which solve the technical problems that the turn-to-turn defect in the middle of the iron core reactor winding cannot be effectively tested in the lightning impulse test due to the fact that the lightning impulse test cannot be used for detecting the turn insulation of an air core reactor, the iron core reactor has the problems of fewer turns, iron core saturation and the like, and the turn insulation test cannot adopt a test mode of the air core reactor, so that the iron core saturation cannot be guaranteed under the rated voltage of 2 times of fundamental waves.
Description
Technical Field
The invention relates to the field of power detection, in particular to a turn-to-turn defect testing circuit and method for an iron core reactor.
Background
The iron core reactor is important primary equipment in a power grid, and has the functions of limiting short-circuit current, limiting closing inrush current of a capacitor bank, limiting low-current grounding current, reducing capacitance effect of an idle circuit and the like. Since reactors are often a kit for other power equipment, they are usually operated without any protection and are often discovered after burnout when a reactor fails. This not only can cause very big hidden danger to the safe operation of electric wire netting, also can cause the loss to power consumption enterprise. The accident of the iron core reactor is mostly caused by inter-turn defects, so that the inter-turn defects of the iron core reactor in the power grid are detected regularly.
The iron core reactor has a different structure from a transformer, and each iron core in the iron core reactor only has a single coil, so that the pressure cannot be exerted through a low-voltage winding like a transformer, a corresponding test voltage value is induced in a high-voltage winding, and a test voltage can only be directly exerted on a single winding.
The existing method for testing the inter-turn defects of the iron core reactor comprises a lightning impulse test, a pulse oscillation withstand voltage test and the like, wherein the result of the lightning impulse test is related to the turn insulation of the iron core reactor, but only the wave inlet end of a winding can be checked, and the test voltage is far higher than the power frequency withstand voltage peak value, so that the technical problem that the lightning impulse test cannot effectively test the inter-turn defects in the middle of the winding of the iron core reactor is caused.
Disclosure of Invention
The invention provides a test circuit and a test method for turn-to-turn defects of an iron core reactor, which are used for solving the technical problems that the conventional test method for the turn-to-turn defects of the iron core reactor comprises a lightning impulse test, a pulse oscillation withstand voltage test and the like, wherein the result of the lightning impulse test is related to turn insulation of the iron core reactor, but only the wave inlet end of a winding can be checked, and the test voltage is far higher than a power frequency withstand voltage peak value, so that the lightning impulse test cannot effectively test the turn-to-turn defects in the middle of the winding of the iron core reactor, the pulse oscillation withstand voltage test can be used for detecting the turn insulation of an air core reactor, however, the iron core reactor has the problems of fewer turns, iron core saturation and the like, and the turn insulation test cannot adopt a test mode of the air core reactor, so that the technical problem that the iron core saturation cannot be guaranteed under the rated voltage of 2 times of fundamental wave cannot occur.
The invention provides an inter-turn defect testing circuit of an iron core reactor, which comprises the following components:
The device comprises a variable frequency power supply module, a high-frequency high-voltage transformer, a reactor to be tested, a data acquisition module, a high-voltage divider, a compensation capacitor, a first current sensor and a second current sensor;
The input end of the variable frequency power supply module is electrically connected with a mains supply inlet wire, and the output end of the variable frequency power supply module is electrically connected with one side of the high-frequency high-voltage transformer and is used for outputting variable frequency test voltage with preset frequency to the high-frequency high-voltage transformer;
The other side of the high-frequency high-voltage transformer is electrically connected with the first end of the reactor to be tested respectively and is used for applying a preset test voltage value to the reactor to be tested, wherein the connecting node is a first node, and the second end of the reactor to be tested is connected with the ground potential of the circuit;
one end of the compensation capacitor is connected with the first node, and the other end of the compensation capacitor is connected with the ground potential of the circuit;
The input end of the high-voltage divider is connected to the first node;
The first current sensor and the second current sensor are respectively arranged at the first end and the second end of the reactor to be tested;
The data acquisition module is electrically connected with the output end of the high-voltage divider and is used for acquiring the output voltage value of the high-frequency high-voltage transformer;
the data acquisition module is electrically connected with the first current sensor and the second current sensor respectively and is used for acquiring a test current waveform on the reactor to be tested.
Preferably, the three-phase switch is connected between the mains supply line and the input of the variable frequency power supply module.
Preferably, the high voltage divider comprises:
The first resistor, the second resistor, the first capacitor and the second capacitor;
the first resistor and the first capacitor are connected in parallel to form a first voltage dividing circuit;
The second resistor is connected with the second capacitor in parallel to form a second voltage dividing circuit;
one end of the first voltage dividing circuit is connected with one end of the second voltage dividing circuit, wherein the connecting node is a second node;
The other end of the first voltage dividing circuit is an input end of the high-voltage divider, the second node is an output end of the high-voltage divider, and the other end of the second voltage dividing circuit is connected with the ground potential of the circuit.
Preferably, the method further comprises: a first delay impedance and a second delay impedance;
The first delay impedance is connected between the first current sensor and the data acquisition module, and the second delay impedance is connected between the second current sensor and the data acquisition module.
Preferably, the method further comprises:
A third delay impedance;
the third delay impedance is connected between the output end of the high-voltage divider and the data acquisition module.
The invention provides a method for testing turn-to-turn defects of an iron core reactor, which comprises the following steps:
The variable-frequency power supply module outputs variable-frequency test voltage with a first preset frequency to the high-frequency high-voltage transformer;
The high-frequency high-voltage transformer outputs a first preset test voltage to the reactor to be tested;
the data acquisition module acquires a first test current waveform on the reactor to be tested;
Judging whether the first test current waveform has a periodic discharge signal or not, if so, the iron core reactor has an inter-turn defect, and if not, the iron core reactor does not have the inter-turn defect.
Preferably, before the variable frequency power supply module outputs the variable frequency test voltage with the first preset frequency to the high-frequency high-voltage transformer, the variable frequency power supply module further includes:
calculating a first preset frequency according to a first preset formula, wherein the first preset formula is as follows:
Wherein f x is a first preset frequency, L x is a reactance value of a reactor to be measured, and C 1 is a capacitance value of a compensation capacitor.
Preferably, judging whether the first test current waveform has a periodic discharge signal, if yes, the iron core reactor further includes:
the high-frequency high-voltage transformer outputs a second preset test voltage to the reactor to be tested, wherein a time difference delta t exists between the second preset test voltage and the first preset test voltage;
The data acquisition module acquires a second test current waveform on the reactor to be tested;
Calculating to obtain a discharge distance difference according to a second preset formula, wherein the second preset formula is as follows:
lx＝v×Δt；
Wherein, l x is the discharge distance difference, and v is the discharge speed.
Preferably, the determining whether the first test current waveform has a periodic discharge signal specifically includes:
And obtaining a denoising test current waveform through a denoising algorithm according to the first test current waveform, and judging whether a mode maximum value exists in the denoising test current waveform.
From the above technical scheme, the invention has the following advantages:
The invention provides an inter-turn defect testing circuit of an iron core reactor, which comprises the following components: the device comprises a variable frequency power supply module, a high-frequency high-voltage transformer, a reactor to be tested, a data acquisition module, a high-voltage divider, a compensation capacitor, a first current sensor and a second current sensor; the input end of the variable frequency power supply module is electrically connected with a mains supply inlet wire, and the output end of the variable frequency power supply module is electrically connected with one side of the high-frequency high-voltage transformer and is used for outputting variable frequency test voltage with preset frequency to the high-frequency high-voltage transformer; the other side of the high-frequency high-voltage transformer is electrically connected with the first end of the reactor to be tested respectively and is used for applying a preset test voltage value to the reactor to be tested, wherein the connecting node is a first node, and the second end of the reactor to be tested is connected with the ground potential of the circuit; one end of the compensation capacitor is connected with the first node, and the other end of the compensation capacitor is connected with the ground potential of the circuit; the input end of the high-voltage divider is connected to the first node; the first current sensor and the second current sensor are respectively arranged at the first end and the second end of the reactor to be tested; the data acquisition module is electrically connected with the output end of the high-voltage divider and is used for acquiring the output voltage value of the high-frequency high-voltage transformer; the data acquisition module is electrically connected with the first current sensor and the second current sensor respectively and is used for acquiring a test current waveform on the reactor to be tested.
The invention provides an inter-turn defect testing circuit of an iron core reactor, which adopts the power electronic frequency conversion and power conversion technology, a frequency conversion power supply module is utilized to output a frequency conversion test voltage with preset frequency to a high-frequency high-voltage transformer, the frequency conversion power supply module outputs the frequency conversion test voltage with preset frequency to be boosted to a test voltage value through the high-frequency high-voltage transformer, and a compensating capacitor connected in parallel with the iron core reactor to be tested is arranged on the high-voltage side of the high-frequency high-voltage transformer to compensate inductive current, the iron core of the iron core reactor to be tested is not saturated in a frequency-increasing mode, the problem that the result of the current lightning impact test is related to the turn insulation of the iron core reactor, but only the wave inlet end of a winding is checked, and the test voltage is far higher than a power frequency withstand voltage peak value, so that the lightning impact test cannot effectively test the inter-turn defect in the middle of the iron core reactor winding, and the pulse oscillation test can be used for detecting the turn insulation of the air core reactor, however, the turn insulation test of the iron core reactor cannot be used in a mode of the air core reactor to ensure that the iron core reactor cannot be saturated under the rated voltage by 2 times due to the existence of the problems of fewer turns.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic diagram of an embodiment of an inter-turn defect testing circuit for an iron core reactor according to the present invention;
Fig. 2 is a schematic flow chart of an embodiment of a method for testing inter-turn defects of an iron core reactor according to the present invention;
wherein, the reference numerals are as follows:
K1, three-phase switch; m1, a variable frequency power supply module; t1, a high-frequency high-voltage transformer; lx, reactor to be measured; m2, a data acquisition module; m3, a high-voltage divider; c1, a compensation capacitor; TA1, a first current sensor; TA2, a second current sensor; z1, a first delay impedance; z2, a second delay impedance; z3, third delay impedance.
Detailed Description
The embodiment of the invention provides an inter-turn defect testing circuit of an iron core reactor, which solves the technical problems that the inter-turn defect in the middle of the iron core reactor winding cannot be effectively tested in the lightning impulse test due to the fact that the lightning impulse test cannot be used for detecting the inter-turn defect in the middle of the iron core reactor winding, the iron core reactor cannot adopt the test mode of the air core reactor due to the fact that the number of turns is small, the iron core saturation and the like in the iron core reactor, and the technical problem that the iron core saturation cannot be guaranteed under the 2 times of fundamental wave rated voltage is caused by the fact that the result of the lightning impulse test is related to the turn insulation of the iron core reactor.
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, an inter-turn defect testing circuit for an iron core reactor according to an embodiment of the present invention includes:
the device comprises a variable frequency power supply module M1, a high-frequency high-voltage transformer T1, a reactor Lx to be tested, a data acquisition module M2, a high-voltage divider M3, a compensation capacitor C1, a first current sensor TA1 and a second current sensor TA2;
the input end of the variable frequency power supply module M1 is electrically connected with a mains supply inlet wire, and the output end of the variable frequency power supply module M1 is electrically connected with one side of the high-frequency high-voltage transformer T1 and is used for outputting variable frequency test voltage with preset frequency to the high-frequency high-voltage transformer T1;
In the actual implementation process, the variable-frequency power supply module M1 can output variable-frequency test voltage with specific frequency according to the requirement;
The other side of the high-frequency high-voltage transformer T1 is electrically connected with a first end of a reactor Lx to be tested, and is used for applying a preset test voltage value to the reactor Lx to be tested, wherein a connecting node is a first node, and a second end of the reactor Lx to be tested is connected with the ground potential of the circuit;
The variable frequency power supply module M1 is connected with the high-frequency high-voltage transformer T1, and the variable frequency power supply module M1 outputs variable frequency voltage with specific frequency and is boosted to a test voltage value through the high-frequency high-voltage transformer T1;
One end of the compensation capacitor C1 is connected with the first node, and the other end of the compensation capacitor is connected with the ground potential of the circuit;
the compensation capacitor C1 is used for reducing the output current and capacity of the high-frequency high-voltage transformer T1 by the inductive current required by the reactor Lx to be tested;
the input end of the high-voltage divider M3 is connected to the first node;
the first current sensor TA1 and the second current sensor TA2 are respectively arranged at a first end and a second end of the reactor Lx to be tested;
the data acquisition module M2 is electrically connected with the output end of the high-voltage divider M3 and is used for acquiring the output voltage value of the high-frequency high-voltage transformer T1;
The data acquisition module M2 is electrically connected with the first current sensor TA1 and the second current sensor TA2 respectively and is used for acquiring a test current waveform on the reactor Lx to be tested.
According to the iron core reactor turn-to-turn defect testing circuit adopting the power electronic frequency conversion and power conversion technology, the variable frequency power supply module M1 is utilized to output variable frequency test voltage with preset frequency to the high-frequency high-voltage transformer T1, the variable frequency power supply module M1 outputs variable frequency test voltage with preset frequency to be boosted to a test voltage value through the high-frequency high-voltage transformer T1, the compensating capacitor C1 connected in parallel with the reactor Lx to be tested is arranged to compensate inductive current, the reactor Lx to be tested is arranged on the high-voltage side of the high-frequency high-voltage transformer T1, the iron core of the reactor Lx to be tested is enabled not to be saturated in a frequency increasing mode, the problem that the current result of lightning impact test is related to turn insulation of the reactor, but only the wave inlet end of a winding can be checked, the test voltage is far higher than a power frequency peak value, the problem that the turn-to-turn defect in the middle of the winding of the iron core cannot be effectively tested in the lightning impact test is solved, the pulse vibration test can be used for detecting turn insulation of the air core reactor, however, the iron core reactor has fewer turns and the problem that the iron core is not saturated in the voltage insulation test mode, and the voltage cannot be guaranteed under the voltage insulation test of the iron core insulation test 2.
The above is a description of one embodiment of an inter-turn defect test circuit for an iron core reactor, and another embodiment of an inter-turn defect test circuit for an iron core reactor will be described in detail.
Referring to fig. 1, an inter-turn defect testing circuit for an iron core reactor according to an embodiment of the present invention includes:
the device comprises a variable frequency power supply module M1, a high-frequency high-voltage transformer T1, a reactor Lx to be tested, a data acquisition module M2, a high-voltage divider M3, a compensation capacitor C1, a first current sensor TA1 and a second current sensor TA2;
the input end of the variable frequency power supply module M1 is electrically connected with a mains supply inlet wire, and the output end of the variable frequency power supply module M1 is electrically connected with one side of the high-frequency high-voltage transformer T1 and is used for outputting variable frequency test voltage with preset frequency to the high-frequency high-voltage transformer T1;
The other side of the high-frequency high-voltage transformer T1 is electrically connected with a first end of a reactor Lx to be tested, and is used for applying a preset test voltage value to the reactor Lx to be tested, wherein a connecting node is a first node, and a second end of the reactor Lx to be tested is connected with the ground potential of the circuit;
One end of the compensation capacitor C1 is connected with the first node, and the other end of the compensation capacitor is connected with the ground potential of the circuit;
the input end of the high-voltage divider M3 is connected to the first node;
the first current sensor TA1 and the second current sensor TA2 are respectively arranged at a first end and a second end of the reactor Lx to be tested;
the data acquisition module M2 is electrically connected with the output end of the high-voltage divider M3 and is used for acquiring the output voltage value of the high-frequency high-voltage transformer T1;
The data acquisition module M2 is electrically connected with the first current sensor TA1 and the second current sensor TA2 respectively and is used for acquiring a test current waveform on the reactor Lx to be tested.
Further, the method further comprises the following steps:
the three-phase switch K1 is connected between the mains supply inlet wire and the input end of the variable frequency power supply module M1.
The mains supply inlet wire links to each other with three-phase switch K1, and three-phase switch K1 separates detection test circuit and power inlet wire end, is used for making the test circuit break off power.
Further, the high voltage divider M3 includes:
The first resistor, the second resistor, the first capacitor and the second capacitor;
the first resistor and the first capacitor are connected in parallel to form a first voltage dividing circuit;
the second resistor and the second capacitor are connected in parallel to form a second voltage dividing circuit;
one end of the first voltage dividing circuit is connected with one end of the second voltage dividing circuit, wherein the connecting node is a second node;
The other end of the first voltage dividing circuit is an input end of the high-voltage divider M3, the second node is an output end of the high-voltage divider M3, and the other end of the second voltage dividing circuit is connected with the ground potential of the circuit.
Further, the method further comprises the following steps: a first delay impedance Z1 and a second delay impedance Z2;
the first delay impedance Z1 is connected between the first current sensor TA1 and the data acquisition module M2, and the second delay impedance Z2 is connected between the second current sensor TA2 and the data acquisition module M2.
Further, the method further comprises the following steps:
A third delay impedance Z3;
the third delay impedance Z3 is connected between the output of the high voltage divider M3 and the data acquisition module M2.
The above is a description of another embodiment of an inter-turn defect test circuit of an iron core reactor, and an embodiment of an inter-turn defect test method of an iron core reactor will be described in detail.
Referring to fig. 2, a method for testing turn-to-turn defects of an iron core reactor according to an embodiment of the present invention includes:
201: calculating according to a first preset formula to obtain a first preset frequency, wherein the first preset formula is as follows:
Wherein f x is a first preset frequency, L x is a reactance value of the reactor Lx to be measured, and C 1 is a capacitance value of the compensation capacitor C1.
202: The variable frequency power supply module M1 outputs variable frequency test voltage with a first preset frequency to the high-frequency high-voltage transformer T1;
203: the high-frequency high-voltage transformer T1 outputs a first preset test voltage to the reactor Lx to be tested;
204: the data acquisition module M2 acquires a first test current waveform on the reactor Lx to be tested;
205: obtaining a denoising test current waveform through a denoising algorithm according to the first test current waveform;
206: judging whether a mode maximum value exists in the denoising test current waveform;
207: if yes, the iron core reactor has turn-to-turn defects, and the high-frequency high-voltage transformer T1 outputs a second preset test voltage to the reactor Lx to be tested, wherein the second preset test voltage and the first preset test voltage have a time difference delta T;
208: the data acquisition module M2 acquires a second test current waveform on the reactor Lx to be tested;
209: calculating to obtain a discharge distance difference according to a second preset formula, wherein the second preset formula is as follows:
lx＝v×Δt；
Wherein, l x is the discharge distance difference, v is the discharge speed;
210: if not, the inter-turn defect of the iron core reactor does not exist.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. The utility model provides a magnetic core reactor turn-to-turn defect test circuit which characterized in that includes:
The device comprises a variable frequency power supply module, a high-frequency high-voltage transformer, a reactor to be tested, a data acquisition module, a high-voltage divider, a compensation capacitor, a first current sensor and a second current sensor;
The input end of the variable frequency power supply module is electrically connected with a mains supply inlet wire, and the output end of the variable frequency power supply module is electrically connected with one side of the high-frequency high-voltage transformer and is used for outputting variable frequency test voltage with preset frequency to the high-frequency high-voltage transformer;
The other side of the high-frequency high-voltage transformer is electrically connected with the first end of the reactor to be tested respectively and is used for applying a preset test voltage value to the reactor to be tested, wherein the connecting node is a first node, and the second end of the reactor to be tested is connected with the ground potential of the circuit;
one end of the compensation capacitor is connected with the first node, and the other end of the compensation capacitor is connected with the ground potential of the circuit;
The input end of the high-voltage divider is connected to the first node;
The first current sensor and the second current sensor are respectively arranged at the first end and the second end of the reactor to be tested;
The data acquisition module is electrically connected with the output end of the high-voltage divider and is used for acquiring the output voltage value of the high-frequency high-voltage transformer;
The data acquisition module is respectively and electrically connected with the first current sensor and the second current sensor and is used for acquiring a test current waveform on the reactor to be tested;
The test circuit further comprises: a first delay impedance and a second delay impedance;
the first delay impedance is connected between the first current sensor and the data acquisition module, and the second delay impedance is connected between the second current sensor and the data acquisition module;
The test circuit further comprises:
A third delay impedance;
the third delay impedance is connected between the output end of the high-voltage divider and the data acquisition module.
2. The iron core reactor turn-to-turn defect test circuit of claim 1, further comprising:
the three-phase switch is connected between the mains supply inlet wire and the input end of the variable-frequency power supply module.
3. The iron core reactor turn-to-turn defect test circuit of claim 2, wherein the high voltage divider comprises:
The first resistor, the second resistor, the first capacitor and the second capacitor;
the first resistor and the first capacitor are connected in parallel to form a first voltage dividing circuit;
The second resistor is connected with the second capacitor in parallel to form a second voltage dividing circuit;
one end of the first voltage dividing circuit is connected with one end of the second voltage dividing circuit, wherein the connecting node is a second node;
The other end of the first voltage dividing circuit is an input end of the high-voltage divider, the second node is an output end of the high-voltage divider, and the other end of the second voltage dividing circuit is connected with the ground potential of the circuit.
4. A test method for inter-turn defects of an iron core reactor, applied to the inter-turn defect test circuit of an iron core reactor according to any one of claims 1 to 3, the test method comprising:
The variable-frequency power supply module outputs variable-frequency test voltage with a first preset frequency to the high-frequency high-voltage transformer;
The high-frequency high-voltage transformer outputs a first preset test voltage to the reactor to be tested;
the data acquisition module acquires a first test current waveform on the reactor to be tested;
Judging whether the first test current waveform has a periodic discharge signal or not, if so, the iron core reactor has an inter-turn defect, and if not, the iron core reactor does not have the inter-turn defect.
5. The method for testing turn-to-turn defects of an iron core reactor according to claim 4, wherein the variable frequency power supply module outputs a variable frequency test voltage of a first preset frequency to the high frequency high voltage transformer, further comprising:
calculating a first preset frequency according to a first preset formula, wherein the first preset formula is as follows:
；
Wherein, For the first preset frequency,/>For the reactance value of the reactor to be measured,/>To compensate for the capacitance of the capacitor.
6. The method of claim 5, wherein determining whether the first test current waveform has a periodic discharge signal, if so, further comprises:
The high-frequency high-voltage transformer outputs a second preset test voltage to the reactor to be tested, wherein the second preset test voltage and the first preset test voltage have a time difference ；
The data acquisition module acquires a second test current waveform on the reactor to be tested;
Calculating to obtain a discharge distance difference according to a second preset formula, wherein the second preset formula is as follows:
；
Wherein, For discharge distance difference,/>Is the discharge rate.
7. The method of claim 6, wherein determining whether the periodic discharge signal exists in the first test current waveform comprises:
And obtaining a denoising test current waveform through a denoising algorithm according to the first test current waveform, and judging whether a mode maximum value exists in the denoising test current waveform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711146462.4A CN107748320B (en) | 2017-11-17 | 2017-11-17 | Inter-turn defect testing circuit and method for iron core reactor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711146462.4A CN107748320B (en) | 2017-11-17 | 2017-11-17 | Inter-turn defect testing circuit and method for iron core reactor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107748320A CN107748320A (en) | 2018-03-02 |
| CN107748320B true CN107748320B (en) | 2024-06-14 |
Family
ID=61251254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711146462.4A Active CN107748320B (en) | 2017-11-17 | 2017-11-17 | Inter-turn defect testing circuit and method for iron core reactor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107748320B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110389271A (en) * | 2019-08-14 | 2019-10-29 | 青岛云路特变智能科技有限公司 | Testing System of Transformer and method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105974290A (en) * | 2016-07-22 | 2016-09-28 | 国网河南省电力公司电力科学研究院 | Dry type air reactor turn-to-turn insulation performance detection system and method |
| CN206193166U (en) * | 2016-11-25 | 2017-05-24 | 国家电网公司 | Dry -type iron -core reactor turn to turn partial discharge's detecting system |
| CN207380190U (en) * | 2017-11-17 | 2018-05-18 | 广东电网有限责任公司电力科学研究院 | A kind of iron core reactor turn-to-turn defect tests circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106546893A (en) * | 2016-12-08 | 2017-03-29 | 温英权 | Detection method to inter-turn insulation defect |
| CN107045097A (en) * | 2017-04-26 | 2017-08-15 | 哈尔滨理工大学 | A kind of test of iron-core reactor turn-to-turn insulation batch (-type) induced over voltage withstand test device and test method |
-
2017
- 2017-11-17 CN CN201711146462.4A patent/CN107748320B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105974290A (en) * | 2016-07-22 | 2016-09-28 | 国网河南省电力公司电力科学研究院 | Dry type air reactor turn-to-turn insulation performance detection system and method |
| CN206193166U (en) * | 2016-11-25 | 2017-05-24 | 国家电网公司 | Dry -type iron -core reactor turn to turn partial discharge's detecting system |
| CN207380190U (en) * | 2017-11-17 | 2018-05-18 | 广东电网有限责任公司电力科学研究院 | A kind of iron core reactor turn-to-turn defect tests circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107748320A (en) | 2018-03-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105974290B (en) | A kind of dry-type air-core reactor turn-to-turn insulation performance detecting system and method | |
| CN103969527B (en) | A kind of discharge and recharge life detecting device of high voltage ceramic capacitor | |
| Lavrinovich et al. | Development of pulsed method for diagnostics of transformer windings based on short probe impulse | |
| WO2011000134A1 (en) | Method for detecting transformer winding state utilizing vibration waveform | |
| CN103278756A (en) | Method for assessing transformer oil-paper insulation aging state | |
| CN204330857U (en) | A kind of isolated neutral system capacitance current proving installation | |
| Yao et al. | Improved online monitoring method for transformer winding deformations based on the Lissajous graphical analysis of voltage and current | |
| CN103033695A (en) | Detection method of transformer direct current bias magnetic tolerance ability | |
| CN205355803U (en) | Full overvoltage suppressing device of antiresonance 4PT | |
| CN107748320B (en) | Inter-turn defect testing circuit and method for iron core reactor | |
| CN108490379B (en) | Self-excited oscillation wave-based transformer winding wave process calibration method | |
| CN207067321U (en) | High altitude localities 750kV shunt reactor Partial Discharge Testing on Site devices | |
| CN206258539U (en) | Voltage transformer turn-to-turn short circuit detection means | |
| CN207380190U (en) | A kind of iron core reactor turn-to-turn defect tests circuit | |
| CN107436399A (en) | High altitude localities 750kV shunt reactor local discharge test devices | |
| CN202585083U (en) | Instrument transformer and iron resonance suppression circuit | |
| CN110161381B (en) | Transformer bushing insulation damp state evaluation method based on oscillation waves | |
| CN108735488B (en) | Transformer design method based on self-excited oscillation wave | |
| Tang et al. | Faulty feeder detection based on the composite factors in resonant grounding distribution system | |
| CN107037333B (en) | Wiring structure for partial discharge test of low-voltage side double-winding transformer | |
| CN203164353U (en) | Head dismantling-free transformer medium spectrum testing structure | |
| CN206920546U (en) | A kind of wiring construction of low-pressure side two-winding transformer partial discharge test | |
| CN109342798A (en) | A kind of acquisition methods of insulation of electrical installation polarization depolarization current | |
| CN205609341U (en) | Harmonic elimination formula voltage transformer | |
| CN208937675U (en) | A kind of direct current cables local discharge detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |