CN115343661B - Transformer winding detection device and detection method based on sweep frequency impedance method - Google Patents
Transformer winding detection device and detection method based on sweep frequency impedance method Download PDFInfo
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- CN115343661B CN115343661B CN202210773531.9A CN202210773531A CN115343661B CN 115343661 B CN115343661 B CN 115343661B CN 202210773531 A CN202210773531 A CN 202210773531A CN 115343661 B CN115343661 B CN 115343661B
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- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides a transformer winding detection device based on a sweep frequency impedance method and a detection method thereof, belonging to the technical field of power equipment overhaul, and comprising a device main body and an impedance detection component for movable disassembly and installation, wherein the impedance detection component is installed in a circuit access slot on one side of the device main body, a test wiring terminal and a low-voltage winding wiring terminal are also arranged on the device main body, the low-voltage winding wiring terminal is used for being connected to a low-voltage winding end of a transformer, the test wiring terminal is used for being connected to a winding end on the other side of the transformer, a power module of the device main body is connected with the test wiring terminal through the circuit access slot, the low-voltage winding wiring terminal is connected with the impedance detection component through the circuit access slot, the power module supplies power to the transformer through the test wiring terminal, and a reflux signal of the transformer winding is input to the impedance detection component from the low-voltage winding wiring terminal for analyzing the impedance value of the transformer winding.
Description
Technical Field
The invention relates to the technical field of power equipment overhaul, in particular to a transformer winding detection device and method based on a sweep frequency impedance method.
Background
The transformer is one of important electrical equipment in the power system, the safe operation of the transformer is significant for ensuring the safety of a power grid, and the transformer winding is poor in short-circuit resistance and is a main vulnerable part of the transformer, so that the transformer is extremely easy to damage during operation, and the sweep frequency impedance method is a novel transformer winding deformation detection method, combines the advantages of the frequency response method and the short-circuit impedance method, can effectively monitor the deformation of the transformer winding, reduces the false detection rate, effectively ensures the operation of the power grid, and has higher signal-to-noise ratio and better repeatability and reproducibility.
At present, when the sweep frequency impedance method is used for detecting the stress deformation of the transformer winding, field equipment assembly is needed, the use is complicated, and the working efficiency is poor.
Disclosure of Invention
In view of the above, the invention provides a device and a method for detecting a transformer winding based on a sweep frequency impedance method, which can be used for rapidly connecting with a transformer to obtain an impedance value of the transformer winding, and can effectively improve the working efficiency.
The technical scheme adopted by the embodiment of the invention for solving the technical problems is as follows:
the utility model provides a transformer winding detection device based on sweep frequency impedance method, includes device main part (1), circuit access groove (101) have been seted up to one side of device main part (1), be equipped with in circuit access groove (101) and supply movable dismantlement's impedance detection subassembly (2), be equipped with test wiring end (3) and low voltage winding wiring end (4) on device main part (1), low voltage winding wiring end (4) are used for inserting the low voltage winding end of transformer, test wiring end (3) are used for inserting the opposite side winding end of transformer, the inside power module that is equipped with of device main part (1), power module passes through circuit access groove (101) with test wiring end (3) are connected, low voltage winding wiring end (4) pass through circuit access groove (101) with impedance detection subassembly (2) are connected, power module is through test wiring end (3) to the transformer power supply, the backward flow signal of transformer's winding is followed low voltage winding terminal (4) input to impedance detection subassembly (2).
Preferably, the circuit access slot (101) is a concave slot, wherein the concave slot is provided with two slot walls which are oppositely arranged, two slot bottoms which are symmetrically arranged and have the same depth, and a U-shaped clamping assembly (104) which is connected with the two slot bottoms and is positioned between the two slot walls, the two slot bottoms are respectively provided with a power-on assembly (102), and the opening of one slot wall is provided with a through slot (103); the two power-on assemblies (102) are connected with the positive electrode of the test terminal (3), the second power-on assembly is connected with the positive electrode of the power module, and the negative electrode of the test terminal (3) is connected with the negative electrode of the power module;
the impedance detection assembly (2) comprises a detection main body shell (201), a detection circuit board (202) and a detection sliding cover (203), wherein the detection main body shell (201) is matched with the circuit access groove (101) in shape, the detection main body shell (201) is provided with a detection groove formed in the side edge and a U-shaped groove formed in the middle of the bottom edge, the detection circuit board (202) is installed in the detection groove, the input end of the detection circuit board (202) is connected with the positive electrode and the negative electrode of the low-voltage winding terminal (4), sliding grooves (204) are formed in the two side edges of the detection groove, the two side edges of the sliding cover (203) are in sliding connection with the sliding grooves (204), an upper fixing plate (2031) is arranged on the upper portion of the sliding cover (203), a clamping groove is formed below the opening of the detection groove, a limiting assembly (206) is arranged in the clamping groove, the sliding groove (204) is inserted into the detection groove, the upper fixing plate (2031) and the side edge of the sliding cover (203) is in sliding connection with the sliding groove (204), and the upper fixing plate (203) is in sliding connection with the sliding groove (203), and the limiting assembly (206) is in contact with the upper fixing plate (203) in depth, and the length of the sliding cover (203) is matched with the limiting assembly (103); the inner wall surface of the U-shaped groove is provided with a conductive copper sheet component, the U-shaped groove is matched with the clamping component (104) of the circuit access groove (101), two sides of the middle part of the bottom edge of the detection main body shell (201) are respectively provided with a detection switch-on piece (2011), and the detection switch-on pieces (2011) are electrically connected with the detection circuit board (202);
the impedance detection assembly (2) is inserted into the circuit access slot (101), two detection connection pieces (2011) of the impedance detection assembly (2) are reliably contacted with and electrically connected with two power connection assemblies (102) of the circuit access slot (101), a conductive copper sheet assembly of the impedance detection assembly (2) is reliably contacted with and electrically connected with a clamping assembly (104) of the circuit access slot (101), and a limit assembly (206) of the impedance detection assembly (2) enters into a through slot (103) of the circuit access slot (101) and contacts with the bottom of the through slot (103).
Preferably, the power supply connection assembly (102) comprises a copper main block (1021), a pair of metal columns (1022) and a spring (1024), a spring expansion groove (1025) for placing the spring (1024) and a pair of connection grooves (1023) for placing the metal columns (1022) are formed in the bottom of the circuit connection groove (101), the two connection grooves (1023) are symmetrically arranged on two sides of the spring expansion groove (1025), a limiting ring (1026) is placed in the connection grooves (1023), the outer surface of the limiting ring (1026) is in tight contact with the connection grooves, and the inner circle of the limiting ring (1026) is matched with the diameter of the metal columns (1022); the two ends of the spring (1024) are fixedly connected with the bottom of the spring expansion groove (1025) and the center of the lower surface of the copper main block (1021) respectively, the head of the metal column (1022) is fixedly connected with the lower surface of the copper main block (1021), the metal column (1022) stretches into the connecting groove (1023) and is movably sleeved with the limiting ring (1026), the tail end of the metal column (1022) is provided with an annular bulge structure, and the outer diameter of the annular bulge structure is larger than the inner diameter of the limiting ring (1026).
Preferably, in the detection main body shell (201) of the impedance detection component (2), a pair of arc-shaped grooves (205) are symmetrically formed on the left and right side walls of the U-shaped groove, the conductive copper sheet component comprises a pair of conductive copper sheets, and the two conductive copper sheets are respectively fixed on the inner surfaces of the two arc-shaped grooves (205);
the clamping assembly (104) of the circuit access groove (101) comprises a U-shaped clamping column (1041), a pair of clamping passage grooves (1042) are symmetrically formed in the two left and right side walls of the clamping column (1041), an opening of the clamping passage groove (1042) is formed in the long edge of the clamping passage groove (1042), and the width of the opening of the clamping passage groove (1042) is smaller than the length of the long edge; the inner side wall surface of the clamping passage groove (1042) is made of copper, and the inner side wall of the clamping passage groove (1042) is connected with a ground wire; the clamping passage groove (1042) is internally and movably connected with a copper spring sheet (1043), the length of the copper spring sheet (1043) is longer than that of the long side of the clamping passage groove (1042), the middle part of the copper spring sheet (1043) extends out of the clamping passage groove (1042) from the opening of the clamping passage groove (1042), the clamping passage copper spring sheet (1043) is electrically grounded with the low-voltage winding terminal (4), and the clamping passage copper spring sheet (1043) is grounded;
the impedance detection assembly (2) is inserted into the circuit access groove (101), and the middle part of the copper spring sheet (1043) is embedded into the arc-shaped groove of the U-shaped groove in the impedance detection assembly (2), reliably contacts with the conductive copper sheet and establishes electrical connection.
Preferably, the limiting component (206) comprises a limiting main block (2061) and a torsion spring (2062), the limiting main block (2061) is composed of a cylindrical main body, a fixed shaft and a clamping block, the fixed shaft is fixedly arranged on the lower surface of the cylindrical main body, the clamping block is fixedly arranged on the side wall of the cylindrical main body, the torsion spring is sleeved on the fixed shaft, a first torsion spring jack is formed in the side wall of the fixed shaft, a second torsion spring jack is formed in the inner side wall of the clamping groove, and two fixed ends of the torsion spring (2062) are respectively inserted into the first torsion spring jack and the second torsion spring jack, so that rotary connection is formed between the fixed shaft and the clamping groove;
the clamping block rotates to the position where the sliding cover (203) is located and is in close contact with the upper fixing plate (2031), the sliding cover (203) is in a blocking state, the clamping block rotates to the position where the clamping block is not in contact with the upper fixing plate (2031), and the sliding cover is in a dismounting state;
the impedance detection assembly (2) is inserted into the circuit access groove (101), the sliding cover is in the blocking state, and the fixing shaft and the clamping block are located in the through groove (103).
Preferably, a display screen is mounted on the top outer surface of the detection main body shell (201) of the impedance detection component (2), and is electrically connected with the detection circuit board (202), and the display screen displays the impedance of the transformer to be detected;
the display screen is used for displaying the frequency of the sine sweep signal and the impedance value of the transformer, an output frequency control button used for adjusting the output frequency of the signal is arranged on the display screen, the frequency interval of the sine sweep signal output by the detection circuit board (202) to the first power-on component is 10Hz-1MHz, and the impedance value of the transformer is obtained according to signal analysis input by the low-voltage winding terminal (4).
The invention also provides a detection method of the transformer winding detection device based on the sweep frequency impedance method, the implementation main body is the transformer winding detection device based on the sweep frequency impedance method, and the method comprises the following steps:
connecting wires, namely connecting a low-voltage winding terminal of a transformer winding detection device to a low-voltage winding end of a transformer, and connecting a test terminal of the transformer winding detection device to the winding end at the other side of the transformer;
starting the transformer winding detection device, adjusting the signal output frequency, and inputting a sine sweep frequency signal to the winding of the transformer through the test terminal, wherein the frequency interval of the sine sweep frequency signal is 10Hz to 1MHzd;
receiving a reflux signal output by the winding end at the other side of the transformer through the low-voltage winding terminal;
obtaining a corresponding impedance value according to the sine sweep frequency signal and the reflux signal;
and displaying the impedance value through a display screen.
Preferably, a detection circuit board of the transformer winding detection device is used for adjusting the sine sweep frequency signal, and the detection circuit board is used for analyzing the reflux signal based on a test circuit part therein to obtain the impedance value.
According to the technical scheme, the transformer winding detection device based on the sweep frequency impedance method comprises a device main body and an impedance detection assembly which is movably detached and installed, wherein the impedance detection assembly is installed in a circuit access groove on one side of the device main body, a test wiring terminal and a low-voltage winding wiring terminal are further arranged on the device main body, the low-voltage winding wiring terminal is used for being connected to a low-voltage winding end of a transformer, the test wiring terminal is used for being connected to a winding end on the other side of the transformer, a power module of the device main body is connected with the test wiring terminal through the circuit access groove, the low-voltage winding wiring terminal is connected with the impedance detection assembly through the circuit access groove, the power module supplies power to the transformer through the test wiring terminal, and a backflow signal of a transformer winding is input to the impedance detection assembly from the low-voltage winding wiring terminal so as to analyze the impedance value of the transformer winding.
Drawings
Fig. 1 is a schematic diagram of the overall structure of a transformer winding detection device based on a swept-frequency impedance method according to the present invention.
Fig. 2 is a schematic diagram illustrating the disassembly of the power-on components.
Fig. 3 is a schematic view of a circuit access slot structure of a device body section.
Fig. 4 is an enlarged schematic view of the structure of the clamping assembly at a.
Fig. 5 is an enlarged schematic view of the power-on assembly at B.
Fig. 6 is a block diagram showing the constitution of the impedance detecting unit.
Fig. 7 is a structural diagram of the limiting component structure.
In the figure: the device body 1, the impedance detecting unit 2, the test terminal 3, the low-voltage winding terminal 4, the circuit access slot 101, the power-on unit 102, the copper master 1021, the metal posts 1022, the access slot 1023, the springs 1024, the spring expansion slots 1025, the stopper ring 1026, the through slot 103, the chucking unit 104, the chucking post 1041, the chucking passage slot 1042, the copper spring sheet 1043, the detecting body case 201, the detecting switch-on sheet 2011, the detecting circuit board 202, the detecting slide cover 203, the upper fixing plate 2031, the slide groove 204, the arc slot 205, the stopper unit 206, the stopper master 2061, the torsion spring 2062, the cylindrical body 2063, the fixing shaft 2064, the fixture block 2065, and the conductive copper sheet 207.
Detailed Description
The technical scheme and technical effects of the present invention are further elaborated below in conjunction with the drawings of the present invention.
As shown in fig. 1-7, the present invention provides a transformer winding detection device based on a swept frequency impedance method, which is used for detecting an impedance value of a transformer winding. The device specifically comprises a device body 1, a circuit access slot 101 is formed in one side of the device body 1, an impedance detection component 2 for movable disassembly and installation is arranged in the circuit access slot 101, a test terminal 3 and a low-voltage winding terminal 4 are arranged on the device body 1, the low-voltage winding terminal 4) is used for being connected to a low-voltage winding terminal of a transformer, the test terminal 3) is used for being connected to the winding terminal on the other side of the transformer, a power module is arranged in the device body 1), the power module is connected with the test terminal (3) through the circuit access slot 101), the low-voltage winding terminal 4) is connected with the impedance detection component 2 through the circuit access slot 101), the power module supplies power to the transformer through the test terminal (3), and a reflux signal of the transformer winding is input to the impedance detection component 2 from the low-voltage winding terminal 4.
As shown in fig. 3, the circuit access slot 101 is a concave slot, wherein the concave slot is provided with two slot walls which are oppositely arranged, two slot bottoms which are symmetrically arranged and have the same depth, and a U-shaped clamping component 104 which is connected with the two slot bottoms and is positioned between the two slot walls, the two slot bottoms are provided with power-on components 102, the opening of one slot wall is provided with a through slot 103, in the two power-on components 102, a first power-on component is connected to the positive electrode of the test terminal (3), a second power-on component is connected to the positive electrode of the power module, and the negative electrode of the test terminal (3) is connected with the negative electrode of the power module;
as shown in fig. 4 and 5, the power-on assembly 102 comprises a copper main block 1021, a pair of metal columns 1022 and springs 1024, the bottom of the circuit access slot 101 is provided with a spring expansion slot 1025 for placing the springs 1024 and a pair of power-on slots 1023 for placing the metal columns 1022, and the two power-on slots 1023 are symmetrically arranged at two sides of the spring expansion slot 1025; a limiting ring 1026 is placed in the connecting groove 1023, the outer surface of the limiting ring 1026 is tightly contacted with the connecting groove, the inner circle of the limiting ring 1026 is matched with the diameter of the metal column 1022 in size, so that the metal column 1022 can move up and down in the limiting ring, in order to reduce friction force, the diameter of the metal column can be slightly smaller than the diameter of the inner circle of the limiting ring, and a surface structure for reducing friction force is additionally arranged on the inner surface of the limiting ring; the two ends of the spring 1024 are respectively and fixedly connected with the bottom of the spring expansion groove 1025 and the center of the lower surface of the copper main block 1021, the head of the metal column 1022 is fixedly connected with the lower surface of the copper main block 1021, the metal column 1022 stretches into the connecting groove 1023 and is movably sleeved with the limit ring 1026, the tail end of the metal column 1022 is provided with an annular protruding structure, and the outer diameter of the annular protruding structure is larger than the inner diameter of the limit ring 1026 so as to prevent the metal column 1022 from being separated from the limit ring 1026; specifically, the metal posts 1022 in the first power-on assembly are electrically connected to the test terminals 3, and the metal posts 1022 in the second power-on assembly are electrically connected to the power module;
the clamping assembly 104 of the circuit access slot 101 comprises a U-shaped clamping column 1041, a pair of clamping passage slots 1042 are symmetrically formed on the two left and right side walls of the clamping column 1041, the openings of the clamping passage slots 1042 are arranged on the long sides of the clamping passage slots 1042, and the opening width of the clamping passage slots 1042 is smaller than the length of the long sides; the inner side wall surface of the clamping passage groove 1042 is made of copper, and the inner side wall of the clamping passage groove 1042 is connected with a ground wire; the copper spring sheet 1043 is movably connected in the clamping passage slot 1042, the length of the copper spring sheet 1043 is longer than the length of the long side of the clamping passage slot 1042, and the middle part of the copper spring sheet 1043 extends out of the clamping passage slot 1042 from the opening of the clamping passage slot 1042 to the outside of the clamping passage slot 1042 to be arc-shaped, so that the copper spring sheet 1043 has the clamping function. The clamping path copper spring 1043 is electrically grounded to the low voltage winding terminal 4, and the clamping path copper spring 1043 is grounded. Specifically, the tip of the clamping column 1041 is grounded to the bottom end of the detection body case 201 in the groove through electrical connection.
As shown in fig. 6 and 7, the impedance detection assembly 2 includes a detection main body case 201, a detection circuit board 202, and a detection slider 203, where the detection circuit board 202 is used to adjust a sinusoidal sweep signal, and is also used to analyze a return signal of a transformer based on a test circuit part therein to obtain an impedance value of a transformer winding. The detection main body shell 201 is matched with the circuit access groove 101 in shape, the detection main body shell 201 is provided with a detection groove formed in the side edge and a U-shaped groove formed in the middle of the bottom edge, the detection circuit board 202 is installed in the detection groove, the input end of the detection circuit board 202 is connected with the positive electrode and the negative electrode of the low-voltage winding wiring terminal 4, sliding grooves 204 are formed in the two side edges of the detection groove, the two side edges of the sliding cover 203 are in sliding connection with the sliding grooves 204, an upper fixing plate 2031 is arranged at the upper part of the sliding cover 203, a clamping groove is formed below the opening of the detection groove on the detection main body shell 201, a limiting component 206 is arranged in the clamping groove, the sliding cover 203 is inserted into the sliding groove 204 to enter the detection groove, the upper fixing plate 2031 is contacted with the side edge of the detection circuit board 202, the limiting component 206 acts on the outer surface of the upper fixing plate 2031 to fix the sliding cover 203, the length of the limiting component 206 is matched with the depth of the through groove 103, and the limiting component 206 can not block the insertion of the impedance detection component 2 due to the existence of the groove 103; the inner wall surface of the U-shaped groove is provided with a conductive copper sheet component, the U-shaped groove is matched with the clamping component 104 of the circuit access groove 101 in shape, two sides of the middle part of the bottom edge of the detection main body shell 201 are respectively provided with a detection switch-on piece 2011, and the detection switch-on piece 2011 is electrically connected with the detection circuit board 202;
in the detection main body shell 201 of the impedance detection assembly 2, a pair of arc-shaped grooves 205 are symmetrically formed on the left side wall and the right side wall of the U-shaped groove, the conductive copper sheet assembly comprises a pair of conductive copper sheets 207, and the two conductive copper sheets 207 are respectively fixed on the inner surfaces of the two arc-shaped grooves 205;
the limiting component 206 comprises a limiting main block 2061 and a torsion spring 2062, the limiting main block 2061 consists of a cylindrical main body 2063, a fixed shaft 2064 and a clamping block 2065, the fixed shaft 2064 is fixedly arranged on the lower surface of the cylindrical main body 2063, the clamping block 2065 is fixedly arranged on the side wall of the cylindrical main body 2063, the torsion spring 2062 is sleeved on the fixed shaft 2064, a first torsion spring jack is arranged on the side wall of the fixed shaft, a second torsion spring jack is arranged on the inner side wall of a clamping groove, and two fixed ends of the torsion spring 2062 are respectively inserted into the first torsion spring jack and the second torsion spring jack, so that the fixed shaft and the clamping groove form rotary connection; the fixture block 2065 is rotated to a position where the slide cover 203 is located and is in close contact with the upper fixing plate 2031, the slide cover 203 is in a blocking state, and when the fixture block 2065 is rotated to a position where it is no longer in contact with the upper fixing plate 2031, the slide cover 203 is in a detachable state.
When the impedance detection assembly 2 is ready to be inserted into the circuit access slot 101, the impedance detection assembly 2 is inserted into the circuit access slot 101, and the sliding cover is in a blocking state; when the impedance detecting assembly 2 is inserted into the circuit access slot 101, the fixing shaft and the clamping block are located in the through slot 103, the middle part of the copper spring sheet 1043 is embedded into the arc-shaped slot of the U-shaped slot in the impedance detecting assembly 2 and is reliably contacted with the conductive copper sheet 207 and electrically connected with the conductive copper sheet 207, specifically, the two detection connection pieces 2011 of the impedance detecting assembly 2 are reliably contacted with the two power connection assemblies 102 of the circuit access slot 101 and are electrically connected with the conductive copper sheet assemblies of the impedance detecting assembly 2 and the clamping assembly 104 of the circuit access slot 101, and the limit assembly 206 of the impedance detecting assembly 2 enters the through slot 103 of the circuit access slot 101 and contacts the bottom of the through slot 103, so that in the device, the impedance detecting assembly 2, the test terminal 3, the transformer and the low-voltage winding terminal 4 can form a closed loop.
Further, a display screen is mounted on the top outer surface of the detection main body case 201 of the impedance detection assembly 2, that is, the outer surface of the upper fixing plate 2031, and is electrically connected to the detection circuit board 202, and the display screen displays the impedance of the transformer to be detected. The display screen is used for displaying the frequency of the sine sweep frequency signal and the impedance value of the transformer, the display screen is provided with an output frequency control button for adjusting the output frequency of the signal, the frequency interval of the sine sweep frequency signal output by the detection circuit board (202) to the first power-on component is 10Hz-1MHz, and the impedance value of the transformer is obtained according to signal analysis input by the low-voltage winding terminal (4).
Further, the invention also provides a detection method of the transformer winding detection device based on the frequency sweep impedance method, the implementation main body is the transformer winding detection device based on the frequency sweep impedance method described in fig. 1-7, and the steps comprise:
a detection method of a transformer winding detection device based on a sweep frequency impedance method comprises the following steps:
s1, when the device is installed, firstly, the impedance detection assembly 2 is aligned to the circuit access slot 101 of the device main body 1, the impedance detection assembly 2 is pushed into the circuit access slot 101, at the moment, the arc-shaped slot 205 of the impedance detection assembly 2 is firstly contacted with the clamping assembly 104 of the device main body 1, when the arc-shaped slot 205 is contacted with the copper spring sheet 1043 of the clamping assembly 104, the copper spring sheet 1043 is firstly compressed and pushed continuously, when the conductive copper sheet on the inner surface of the arc-shaped slot 205 is contacted with the copper spring sheet 1043 of the clamping assembly 104, the compressed copper spring sheet 1043 starts to reset, and finally, the copper spring sheet 1043 is reliably contacted with the conductive copper sheet and is electrically connected, so that the current can flow;
s2, in the process of pushing the impedance detection assembly 2 into the circuit access slot 101, a detection connection piece 2011 of the impedance detection assembly 2 is firstly attached to the power supply connection assembly 102, and the spring 1024 is compressed to deform, so that elasticity is generated to act on the copper main block 1021, so that the copper main block 1021 is tightly contacted with the detection connection piece 2011, and after equipment is installed, detection test work of a transformer winding can be performed;
s3, when detection is carried out, firstly, the low-voltage winding end of the transformer is connected into the low-voltage winding terminal 4, and then the winding on the other side of the transformer is connected with the test terminal 3; the power supply module in the device main body 1 adjusts the signal output frequency under the control of the detection circuit board 202, and outputs a sine sweep frequency signal with the frequency of 10Hz to 1MHz to the test terminal 3, the sine sweep frequency signal flows through the transformer, and then outputs a reflux signal from the low-voltage winding end to the low-voltage winding terminal 4, the reflux signal is analyzed through a sweep frequency impedance method through the corresponding test circuit part arranged in the detection circuit board 202, so as to obtain a corresponding impedance value, and the value of the reflux signal can be displayed through the display screen of the impedance detection assembly 2;
s4, when the detection circuit board 202 fails, the device current is disconnected, the impedance detection assembly 2 is extracted, the limit main block 2061 of the limit assembly 206 is rotated, so that the torsion spring 2062 is twisted, the limit assembly 206 is unlocked to the sliding cover 203, the sliding cover 203 is extracted, the detection circuit board 202 is exposed, and the detection circuit board 202 can be overhauled.
The detection device and the detection method for the transformer winding based on the sweep frequency impedance method can be used for rapidly connecting with a transformer and obtaining the impedance value of the transformer winding, and can effectively improve the working efficiency.
The last points to be described are: first, in the description of the present application, it should be noted that, unless otherwise specified and defined, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be mechanical or electrical, or may be a direct connection between two elements, and "upper," "lower," "left," "right," etc. are merely used to indicate relative positional relationships, which may be changed when the absolute position of the object being described is changed;
secondly: in the drawings of the disclosed embodiments, only the structures related to the embodiments of the present disclosure are referred to, and other structures can refer to the common design, so that the same embodiment and different embodiments of the present disclosure can be combined with each other under the condition of no conflict;
finally: the foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
The foregoing disclosure is illustrative of the preferred embodiments of the present invention, and is not to be construed as limiting the scope of the invention, as it is understood by those skilled in the art that all or part of the above-described embodiments may be practiced with equivalents thereof, which fall within the scope of the invention as defined by the appended claims.
Claims (6)
1. The utility model provides a transformer winding detection device based on sweep frequency impedance method, includes device main part (1), its characterized in that: a circuit access groove (101) is formed in one side of the device main body (1), an impedance detection component (2) for movable disassembly and installation is arranged in the circuit access groove (101), a test wiring terminal (3) and a low-voltage winding wiring terminal (4) are arranged on the device main body (1), the low-voltage winding wiring terminal (4) is used for being connected to a low-voltage winding end of a transformer, the test wiring terminal (3) is used for being connected to the winding end on the other side of the transformer, a power module is arranged in the device main body (1), the power module is connected with the test wiring terminal (3) through the circuit access groove (101), the low-voltage winding wiring terminal (4) is connected with the impedance detection component (2) through the circuit access groove (101), the power module supplies power to the transformer through the test wiring terminal (3), and a reflux signal of a winding of the transformer is input to the impedance detection component (2) from the low-voltage winding wiring terminal (4);
the circuit access groove (101) is a concave groove, wherein the concave groove is provided with two groove walls which are oppositely arranged, two groove bottoms which are symmetrically arranged and have the same depth, and a U-shaped clamping component (104) which is connected with the two groove bottoms and is positioned between the two groove walls, the two groove bottoms are respectively provided with a power-on component (102), and the opening of one groove wall is provided with a through groove (103); of the two power-on assemblies (102), a first power-on assembly is connected to the positive electrode of the test terminal (3), a second power-on assembly is connected to the positive electrode of the power module, and the negative electrode of the test terminal (3) is connected with the negative electrode of the power module;
the impedance detection assembly (2) comprises a detection main body shell (201), a detection circuit board (202) and a detection sliding cover (203), wherein the detection main body shell (201) is matched with the circuit access groove (101) in shape, the detection main body shell (201) is provided with a detection groove formed in the side edge and a U-shaped groove formed in the middle of the bottom edge, the detection circuit board (202) is installed in the detection groove, the input end of the detection circuit board (202) is connected with the positive electrode and the negative electrode of the low-voltage winding terminal (4), sliding grooves (204) are formed in the two side edges of the detection groove, the two side edges of the sliding cover (203) are in sliding connection with the sliding grooves (204), an upper fixing plate (2031) is arranged on the upper portion of the sliding cover (203), a clamping groove is formed below the opening of the detection groove, a limiting assembly (206) is arranged in the clamping groove, the sliding groove (204) is inserted into the detection groove, the upper fixing plate (2031) and the side edge of the sliding cover (203) is in sliding connection with the sliding groove (204), and the upper fixing plate (203) is in sliding connection with the sliding groove (203), and the limiting assembly (206) is in contact with the upper fixing plate (203) in depth, and the length of the sliding cover (203) is matched with the limiting assembly (103); the inner wall surface of the U-shaped groove is provided with a conductive copper sheet component, the U-shaped groove is matched with the clamping component (104) of the circuit access groove (101), two sides of the middle part of the bottom edge of the detection main body shell (201) are respectively provided with a detection switch-on piece (2011), and the detection switch-on pieces (2011) are electrically connected with the detection circuit board (202);
the impedance detection component (2) is inserted into the circuit access slot (101), two detection connection pieces (2011) of the impedance detection component (2) are reliably contacted and electrically connected with two power connection components (102) of the circuit access slot (101), the conductive copper sheet component of the impedance detection component (2) is reliably contacted and electrically connected with a clamping component (104) of the circuit access slot (101), and the limit component (206) of the impedance detection component (2) enters the through slot (103) of the circuit access slot (101) and contacts the bottom of the through slot (103);
a display screen is arranged on the top outer surface of the detection main body shell (201) of the impedance detection component (2), the display screen is electrically connected with the detection circuit board (202), and the display screen displays the impedance of the transformer to be detected;
the display screen is used for displaying the frequency of the sine sweep signal and the impedance value of the transformer, an output frequency control button used for adjusting the output frequency of the signal is arranged on the display screen, the frequency interval of the sine sweep signal output by the detection circuit board (202) to the first power-on component is 10Hz-1MHz, and the impedance value of the transformer is obtained according to signal analysis input by the low-voltage winding terminal (4).
2. The transformer winding detection device based on the sweep impedance method according to claim 1, wherein:
the power-on assembly (102) comprises a copper main block (1021), a pair of metal columns (1022) and springs (1024), a spring expansion groove (1025) for placing the springs (1024) and a pair of connection grooves (1023) for placing the metal columns (1022) are formed in the bottom of the circuit access groove (101), the two connection grooves (1023) are symmetrically arranged on two sides of the spring expansion groove (1025), limiting rings (1026) are placed in the connection grooves (1023), the outer surfaces of the limiting rings (1026) are in tight contact with the connection grooves, and the inner circle of each limiting ring (1026) is matched with the diameter of each metal column (1022); the two ends of the spring (1024) are fixedly connected with the bottom of the spring expansion groove (1025) and the center of the lower surface of the copper main block (1021) respectively, the head of the metal column (1022) is fixedly connected with the lower surface of the copper main block (1021), the metal column (1022) stretches into the connecting groove (1023) and is movably sleeved with the limiting ring (1026), the tail end of the metal column (1022) is provided with an annular bulge structure, and the outer diameter of the annular bulge structure is larger than the inner diameter of the limiting ring (1026).
3. The transformer winding detection device based on the sweep impedance method according to claim 2, wherein:
in the detection main body shell (201) of the impedance detection component (2), a pair of arc-shaped grooves (205) are symmetrically formed on the left side wall and the right side wall of the U-shaped groove, the conductive copper sheet component comprises a pair of conductive copper sheets, and the two conductive copper sheets are respectively fixed on the inner surfaces of the two arc-shaped grooves (205);
the clamping assembly (104) of the circuit access groove (101) comprises a U-shaped clamping column (1041), a pair of clamping passage grooves (1042) are symmetrically formed in the two left and right side walls of the clamping column (1041), an opening of the clamping passage groove (1042) is formed in the long edge of the clamping passage groove (1042), and the width of the opening of the clamping passage groove (1042) is smaller than the length of the long edge; the inner side wall surface of the clamping passage groove (1042) is made of copper, and the inner side wall of the clamping passage groove (1042) is connected with a ground wire; the clamping passage groove (1042) is internally and movably connected with a copper spring sheet (1043), the length of the copper spring sheet (1043) is longer than that of the long side of the clamping passage groove (1042), the middle part of the copper spring sheet (1043) extends out of the clamping passage groove (1042) from the opening of the clamping passage groove (1042), the clamping passage copper spring sheet (1043) is electrically grounded with the low-voltage winding terminal (4), and the clamping passage copper spring sheet (1043) is grounded;
the impedance detection assembly (2) is inserted into the circuit access groove (101), and the middle part of the copper spring sheet (1043) is embedded into the arc-shaped groove of the U-shaped groove in the impedance detection assembly (2), reliably contacts with the conductive copper sheet and establishes electrical connection.
4. A transformer winding detection apparatus based on a swept impedance method as claimed in claim 3, wherein:
the limiting assembly (206) comprises a limiting main block (2061) and a torsion spring (2062), the limiting main block (2061) is composed of a cylindrical main body, a fixed shaft and a clamping block, the fixed shaft is fixedly arranged on the lower surface of the cylindrical main body, the clamping block is fixedly arranged on the side wall of the cylindrical main body, the torsion spring is sleeved on the fixed shaft, a first torsion spring jack is formed in the side wall of the fixed shaft, a second torsion spring jack is formed in the inner wall of the clamping groove, and two fixed ends of the torsion spring (2062) are respectively inserted into the first torsion spring jack and the second torsion spring jack, so that rotary connection is formed between the fixed shaft and the clamping groove;
the clamping block rotates to the position where the sliding cover (203) is located and is in close contact with the upper fixing plate (2031), the sliding cover (203) is in a blocking state, the clamping block rotates to the position where the clamping block is not in contact with the upper fixing plate (2031), and the sliding cover is in a dismounting state;
the impedance detection assembly (2) is inserted into the circuit access groove (101), the sliding cover is in the blocking state, and the fixing shaft and the clamping block are located in the through groove (103).
5. A detection method of a transformer winding detection device based on a sweep impedance method, characterized in that the following steps are performed by the transformer winding detection device based on a sweep impedance method as defined in any one of claims 1 to 4, comprising:
connecting wires, namely connecting a low-voltage winding terminal of a transformer winding detection device to a low-voltage winding end of a transformer, and connecting a test terminal of the transformer winding detection device to the winding end at the other side of the transformer;
starting the transformer winding detection device, adjusting the signal output frequency, and inputting a sine sweep frequency signal to the winding of the transformer through the test terminal, wherein the frequency interval of the sine sweep frequency signal is 10Hz to 1MHzd;
receiving a reflux signal output by the winding end at the other side of the transformer through the low-voltage winding terminal;
obtaining a corresponding impedance value according to the sine sweep frequency signal and the reflux signal;
and displaying the impedance value through a display screen.
6. The method of claim 5, wherein a detection circuit board of the transformer winding detection device is used for adjusting the sinusoidal sweep signal, and the detection circuit board is used for analyzing the return signal based on a test circuit component therein to obtain the impedance value.
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| CN202210773531.9A CN115343661B (en) | 2022-07-01 | 2022-07-01 | Transformer winding detection device and detection method based on sweep frequency impedance method |
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