CN111596132A - DC resistance tester - Google Patents
DC resistance tester Download PDFInfo
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- CN111596132A CN111596132A CN202010451430.0A CN202010451430A CN111596132A CN 111596132 A CN111596132 A CN 111596132A CN 202010451430 A CN202010451430 A CN 202010451430A CN 111596132 A CN111596132 A CN 111596132A
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- 238000012360 testing method Methods 0.000 claims abstract description 173
- 238000001514 detection method Methods 0.000 claims abstract description 46
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- 230000007246 mechanism Effects 0.000 claims description 11
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
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Abstract
The embodiment of the invention discloses a direct current resistance tester, which comprises a test host, wherein the test host comprises: the temperature acquisition module is used for acquiring the temperature of the device to be measured; the resistance testing module is connected with the device to be tested and used for inputting a testing signal to the device to be tested and detecting a response signal of the device to be tested to the testing signal; and the main control module is respectively connected with the temperature acquisition module and the resistance test module, and is used for determining a direct current resistance initial value of the device to be tested according to the response signal and the test signal and converting the direct current resistance initial value according to the temperature to obtain a direct current resistance target value. The embodiment of the invention provides that the temperature of the device to be tested is obtained by arranging the temperature obtaining module in the test host, and then the main control module directly calculates the direct current resistance target value corresponding to the temperature according to the temperature information and the output signal of the resistance test module, so that the temperature conversion of the direct current resistance is automatically completed, and the detection efficiency and the accuracy of the detection data are improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of power equipment, in particular to a direct current resistance tester.
Background
The detection of the direct current resistance of the transformer is a necessary measurement item of transformer delivery test, installation and handover test and power department preventive test, and can effectively find out manufacturing defects of transformer coil selection, welding, loose connection parts, strand missing, wire breakage and the like and hidden troubles existing after operation. The on-load tap changer that uses at present generally has 17 gears at the side that becomes high, when testing direct current resistance, need measure the data of every gear.
The direct current resistance tester used at present can only complete the test of direct current resistance, lacks the temperature conversion function, needs to carry out the resistance value under the different temperatures of manual calculation, carries out the temperature conversion, and calculation work load is great, appears the mistake easily moreover, causes work efficiency lower, and has the condition that the test result misjudged.
Disclosure of Invention
The embodiment of the invention provides a direct current resistance tester, which aims to improve the detection efficiency of the direct current resistance of a transformer.
The embodiment of the invention provides a direct current resistance tester, which comprises a test host, wherein the test host comprises:
the temperature acquisition module is used for acquiring the temperature of the device to be measured;
the resistance testing module is connected with the device to be tested and used for inputting a testing signal to the device to be tested and detecting a response signal of the device to be tested to the testing signal;
and the main control module is respectively connected with the temperature acquisition module and the resistance test module, and is used for determining a direct current resistance initial value of the device to be tested according to the response signal and the test signal and converting the direct current resistance initial value according to the temperature to obtain a direct current resistance target value.
Optionally, the test host further includes a gear adjusting module, the gear adjusting module is connected to the main control module, and the gear adjusting module is configured to respond to the main control module to output a gear shifting command;
the tester also comprises a gear shifting assistant, the gear shifting assistant is connected with a gear shifting switch of the device to be tested, the gear shifting assistant is in communication connection with the gear adjusting module, and the gear shifting assistant is used for responding to the gear shifting command to adjust the gear of the device to be tested.
Optionally, the gear shifting assistant includes:
the communication module is used for communicating with the gear adjusting module and receiving the gear shifting command;
the controller is connected with the communication module and used for analyzing the gear shifting command and outputting a gear shifting signal based on an analysis result;
the driving module is connected with the controller and used for responding to the gear shifting signal to generate a driving signal;
the motor, the signal input part of motor connects drive module, the output of motor is connected with rotatory handle, rotatory handle be used for with the gear shifting switch of the device to be measured is connected, the motor is used for responding drive signal adjusts the gear shifting switch, it is right to carry out the gear adjustment to the device to be measured.
Optionally, a groove is formed at a connection end of the rotating handle and the gear shifting switch, the size of the groove is matched with the width of the gear shifting switch, and the rotating handle of the gear shifting assistant is connected with the gear shifting switch of the device to be tested through the groove;
the body of the gear shifting assistant is connected with a fixing device, and when the gear shifting assistant is in a test state, the body of the gear shifting assistant is fixed on a shell of the gear shifting switch through the fixing device.
Optionally, the fixing device includes a first adjusting rod and a second adjusting rod, and the first adjusting rod and the second adjusting rod are connected to two ends of the body of the gear shifting assistant;
the first adjusting rod and the second adjusting rod both comprise a supporting rod and a movable rod, and the movable rod is movably connected with the supporting rod and can rotate relative to the supporting rod; one end of the supporting rod is connected with the body of the gear shifting assistant, the other end of the supporting rod is movably connected with one end of the movable rod, the other end of the movable rod is provided with a fixing clamp, and the movable rod is fixed with the shell of the gear shifting switch through the fixing clamp.
Optionally, a tightening mechanism is arranged at the connecting end of the movable rod and the support rod;
when the tightening mechanism is in a loosening state, the movable rod can rotate relative to the supporting rod;
when the tightening mechanism is in a tensioning state, the movable rod is fixed relative to the support rod.
Optionally, the gear shifting assistant further includes a power module, the power module is connected to the controller, and the controller is further configured to detect electric quantity information of the power module and send the electric quantity information to the test host through the communication module.
Optionally, the resistance testing module includes a current output module and an electric quantity collecting module;
the current output module is used for outputting a current test signal;
the electric quantity acquisition module is used for acquiring the voltage of the output end of the device to be tested as a voltage response signal;
the main control module is used for determining the initial value of the direct current resistance according to the current test signal and the voltage response signal.
Optionally, the test host further includes a temperature setting module and a temperature and humidity detection module, and the temperature setting module and the temperature and humidity detection module are respectively connected to the temperature acquisition module;
the temperature setting module is used for inputting a temperature setting value;
the temperature and humidity detection module is used for detecting the ambient temperature and the ambient humidity and outputting a temperature detection value and a humidity detection value;
the temperature acquisition module is used for determining the temperature set value or the temperature detection value as the temperature of the device to be detected.
Optionally, the test host further includes a display module and a printing module;
the display module is connected with the main control module and is used for displaying the direct current resistance target value, the temperature detection value, the humidity detection value, the current gear information of the gear shifting assistant and the electric quantity information of the gear shifting assistant;
the printing module is connected with the main control module and is used for responding to the main control module to print test data at least comprising the direct current resistance target value.
According to the direct current resistance tester provided by the embodiment of the invention, the temperature of the device to be tested is obtained by arranging the temperature obtaining module in the test host, and then the main control module can directly convert the direct current resistance initial value determined by the test signal and the response signal output by the resistance test module into the direct current resistance target value according to the temperature information to output, so that the problems of large calculated amount, low working efficiency and error caused by easy error caused by manual conversion of the direct current resistance test value in the prior art are solved, the automatic conversion of the direct current resistance is realized, the detection efficiency of the device to be tested is improved, and the accuracy of the detection data is improved.
Drawings
Fig. 1 is a schematic structural diagram of a dc resistance tester according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another DC resistance tester according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another DC resistance tester according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another DC resistance tester according to an embodiment of the present invention;
FIG. 5 is a side view of a shift assistant provided in accordance with an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a shift assistant connection fixture according to an embodiment of the present invention;
FIG. 7 is a flow chart of temperature conversion performed by the DC resistance tester according to the embodiment of the present invention;
FIG. 8 is a flow chart of a shift of a DC resistance tester according to an embodiment of the present invention;
fig. 9 is a flow chart of resistance testing performed by the dc resistance tester according to the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a dc resistance tester according to an embodiment of the present invention, where the dc resistance tester may be used to measure a dc resistance of a transformer, and referring to fig. 1, the dc resistance tester includes a test host 10, and the test host 10 includes:
the temperature acquisition module 110 is configured to acquire a temperature of the device under test;
the resistance testing module 120 is connected to the device to be tested, and is configured to input a test signal to the device to be tested and detect a response signal of the device to be tested to the test signal;
the main control module 130 is connected to the temperature obtaining module 110 and the resistance testing module 120, respectively, and the main control module 130 is configured to determine a dc resistance initial value of the device to be tested according to the response signal and the test signal, and convert the dc resistance initial value according to the temperature to obtain a dc resistance target value.
Specifically, the device under test may be, for example, a transformer, and accordingly, the temperature of the device under test is the temperature of the coil winding of the transformer. By setting the temperature obtaining module 110, the test host 10 can automatically obtain the current temperature of the device to be tested, so that the test host 10 can perform temperature conversion on the tested dc resistance value according to the temperature, and convert the tested dc resistance value into a dc resistance value at a standard temperature, and the dc resistance tester provided by this embodiment can automatically complete temperature conversion on the dc resistance and output the converted dc resistance value.
The resistance testing module 120 is configured to send a test signal and a detection feedback signal to the device under test in response to the test command of the main control module 130, and output the test signal and the response signal to the main control module 130.
The main control module 130 may be a computing unit with data processing capability, such as a single chip microcomputer. The initial value of the dc resistance is a resistance value calculated by the main control module 130 according to the response signal and the test signal output by the resistance test module 120. The dc resistance target value is a resistance value obtained by the main control module 130 performing temperature conversion on the dc resistance initial value.
In one embodiment, the resistance testing module 120 includes a current output module 121 and a power harvesting module 122, wherein,
the current output module 121 is configured to output a current test signal;
the electric quantity collecting module 122 is configured to collect an output terminal voltage of the device under test as a voltage response signal.
The main control module 130 calculates an initial value of the dc resistance from the current test signal and the voltage response signal according to ohm's law.
Further, the main control module 130 calculates a dc resistance target value from the dc resistance initial value and the temperature value output by the temperature obtaining module 110 according to the following formula,
where T1 is the current temperature, T2 is the target temperature, R1 is the resistance value at T1 temperature, R2 is the resistance value at T2 temperature, and T is the resistance temperature constant.
Optionally, the target temperature in this embodiment may be adjusted by software, or may be manually input by a detector through an input module of the tester, and the setting manner of the target temperature is not limited in this embodiment.
The testing principle of the direct current resistance tester is as follows: the main control module 130 in the test host 10 calculates the initial value of the dc resistance according to the response signal and the test signal output by the resistance test module 120, performs temperature conversion on the initial value of the dc resistance according to the obtained temperature value to obtain a target value of the dc resistance, and directly outputs the target value of the dc resistance.
According to the direct current resistance tester provided by the embodiment of the invention, the temperature of the device to be tested is obtained by arranging the temperature obtaining module 110 in the test host 10, and then the main control module 130 can directly convert the direct current resistance initial value determined by the test signal and the response signal output by the resistance test module 120 into the direct current resistance target value according to the temperature information to output, so that manual conversion of the direct current resistance detection value is not needed, the problems of large calculation amount, low working efficiency and error prone caused by manual conversion of the direct current resistance test value in the prior art are solved, automatic conversion of the direct current resistance is realized, the detection efficiency of the device to be tested is improved, and the accuracy of the detection data is improved.
Optionally, fig. 2 is a schematic structural diagram of another dc resistance tester provided in an embodiment of the present invention. On the basis of the above embodiment, as shown in fig. 2, the test host 10 further includes a temperature setting module 140 and a temperature and humidity detecting module 150, wherein the temperature setting module 140 and the temperature and humidity detecting module 150 are respectively connected to the temperature obtaining module 110;
the temperature setting module 140 is used for inputting a temperature setting value;
the temperature and humidity detection module 150 is used for detecting the ambient temperature and the ambient humidity and outputting a temperature detection value and a humidity detection value;
the temperature obtaining module 110 is configured to determine a temperature set value or a temperature detection value as a temperature of the dut.
Specifically, the temperature setting module 140 is used for the tester operator to manually input a temperature setting value, which is suitable for the case where the temperature of the coil winding of the transformer is not matched with the ambient temperature. For example, when the transformer to be tested just exits from operation, the temperature of the coil winding is significantly higher than the current ambient temperature, and at this time, if the initial value of the direct current resistance of the transformer is subjected to temperature conversion according to the ambient temperature, the obtained detection result is inevitably inaccurate. At this time, the tester operator may read the temperature of the thermometer in the transformer, and input the temperature to the temperature setting module 140, and the temperature obtaining module 110 determines the temperature setting value input by the temperature setting module 140 as the temperature of the transformer, so that the main control module 130 performs temperature conversion on the initial value of the dc resistance of the transformer according to the temperature setting value input by the tester operator, so that the initial value of the dc resistance of the transformer can correspond to the current actual temperature, and the result of the target value of the dc resistance calculated by the main control module 130 is more accurate. Further, the temperature setting module 140 may be further configured to input a target temperature, so as to perform temperature conversion on the resistance detection value of the device under test of the main control module 130, and directly output the dc resistance value after the temperature conversion.
Temperature and humidity detection module 150 is used for detecting the temperature and humidity of current environment, through configuration temperature and humidity detection module 150 in test host 10, on the one hand, tester operating personnel can directly perceivedly confirm current ambient temperature and humidity information to judge whether current temperature and humidity information accords with the test requirement, thereby need not additionally to carry the hygrothermograph and detect ambient temperature, reduced the quantity of the instrument that needs to carry. On the other hand, when the test result of the dc resistance is compared with the reference data, the test temperature should be the same, and the test result needs to be converted to the reference temperature according to the formula. By configuring the temperature and humidity detection module 150, the temperature value detected by the temperature and humidity detection module 150 is directly sent to the temperature acquisition module 110, so that the main control module 130 can perform temperature conversion on the direct current resistance according to the detected temperature value, and the requirement that the calculated test result of the direct current resistance and the reference data have the same test temperature is met.
Optionally, a temperature isolation material is disposed between the temperature and humidity detection module 150 and the main control module 130 in this embodiment, and by setting the temperature isolation material, the problem that the temperature and humidity cannot truly reflect the ambient temperature and the ambient humidity due to the influence of heat generated by the main control module 130 can be solved.
Generally, the following 3 situations are generally required to shift gears in the process of performing the winding direct current resistance test of the power system: (1) in the stage of the test preparation process, because the on-load switch does not act for a long time, the surface of the on-load switch possibly has an oxide film, so that the test result is inaccurate, the on-load switch needs to be switched back and forth, and the oxide film on the surface is removed; (2) the on-load tap changer that uses at present generally has 17 gears at the side that becomes high, when testing direct current resistance, need measure the data of every gear. In the normal test process, switching from 1 gear to 17 gears step by step according to the test progress; (3) and when the test result of the individual gear is larger, the gear is shifted back and forth, and the oxide film of the larger gear is eliminated.
The traditional direct current resistance tester needs to arrange a specially-assigned person to perform manual gear shifting at the position of the on-load switch and perform voice communication with the operator of the tester, and generally needs loud conversation, so that the problems of waste of human resources and low communication efficiency exist.
In order to solve the above problem, the dc resistance tester provided in the embodiment of the present invention is further provided with a gear shifting assistant 20, which is further described below with reference to the accompanying drawings.
Optionally, fig. 3 is a schematic structural diagram of another dc resistance tester provided in an embodiment of the present invention. On the basis of the above embodiment, as shown in fig. 3, the test master 10 further includes a gear adjusting module 160, the gear adjusting module 160 is connected to the main control module 130, and the gear adjusting module 160 is configured to respond to the main control module 130 outputting a gear shifting command;
the tester further comprises a gear shifting assistant 20, the gear shifting assistant 20 is connected with a gear shifting switch of the device under test, the gear shifting assistant 20 is in communication connection with a gear adjusting module 160, and the gear shifting assistant 20 is used for responding to a gear shifting command to adjust the gear of the device under test.
Specifically, the test master 10 is provided with gear adjustment buttons, such as an upshift button and a downshift button, an operator of the tester issues an upshift or downshift command to the main control module 130 by triggering the upshift button or the downshift button during the test, and the main control module 130 outputs a corresponding shift command through the gear adjustment module 160 after a logic determination.
The gear shifting assistant 20 communicates with the test host 10 in a wireless manner to receive a gear shifting command of the test host 10 to adjust the gear of the gear shifting switch of the device to be tested, and after the gear shifting is completed, a feedback signal indicating that the gear shifting is completed is fed back to the test host 10, so that the test host 10 can perform a resistance test. When the device to be tested is a transformer, the gear shifting switch is an on-load switch of the transformer.
This embodiment carries out the gear adjustment through providing gear shifting assistant 20 to the gear shifting switch of device under test, and gear shifting assistant 20 communicates with test host 10 through wireless mode, and tester operating personnel can carry out the gear adjustment to the gear shifting switch through gear shifting assistant 20 in test host 10 side to need arrange the special messenger to adjust the gear shifting switch and cause the extravagant problem that manpower resources and detection efficiency are low among the prior art to solved.
Optionally, fig. 4 is a schematic structural diagram of another dc resistance tester provided in the embodiment of the present invention. On the basis of the above embodiment, as shown in fig. 4, the gear shifting assistant 20 includes:
a communication module 210, configured to communicate with the gear adjustment module 160, and receive a gear shifting command;
the controller 220 is connected with the communication module 210 and used for analyzing the gear shifting command and outputting a gear shifting signal based on the analysis result;
a driving module 230 connected to the controller 220 for generating a driving signal in response to the shift signal;
the signal input end of the motor 240 is connected with the driving module 230, the output end of the motor 240 is connected with a rotating handle, the rotating handle is used for being connected with a gear shifting switch of the device to be tested, and the motor 240 is used for responding to a driving signal to adjust the gear shifting switch so as to adjust the gear of the device to be tested.
Specifically, the communication module 210 may be, for example, a bluetooth communication module 210, and the shift assistant 20 implements wireless communication with the test host 10 through the communication module 210, so that by fixing the shift assistant 20 at the shift switch of the device under test, the tester operator can control the shift assistant 20 to perform shift adjustment on the shift switch of the device under test on the test host 10 side.
The controller 220 may be, for example, a single chip, and after the controller 220 analyzes the received shift command, the controller outputs a shift signal to the driving module 230, and the driving module 230 outputs a corresponding driving signal to the motor 240.
The power output end of the motor 240 is provided with a rotating handle, and the rotating handle is connected with the gear shifting switch of the device to be tested, so that the motor 240 can output power to the gear shifting switch, drive the gear shifting switch to rotate clockwise or anticlockwise, and complete gear adjustment of the gear shifting switch.
When the gear shift switch is adjusted, the gear shift assistant 20 needs to be fixed to prevent the gear shift assistant body 22 from following rotation when the gear is shifted. The structure of the shift assistant 20 in the present embodiment will be further described with reference to the drawings.
Optionally, fig. 5 is a side view of a gear shifting assistant according to an embodiment of the present invention. On the basis of the above embodiment, as shown in fig. 5, a groove 211 is provided at a connection end of the turning handle 21 of the gearshift assistant 20 and the gearshift switch, a size of the groove 211 matches a width of the gearshift switch, and the turning handle 21 of the gearshift assistant 20 is connected to the gearshift switch of the device under test through the groove 211;
the shift assistant body 22 has a fixing device attached thereto, and when the shift assistant 20 is in the test state, the shift assistant body 22 is fixed to the housing of the shift switch by the fixing device.
Specifically, the turning handle 21 of the gear shifting assistant 20 is clamped with the gear shifting switch through the groove 211, so that when the power output end of the motor 240 rotates, the turning handle 21 is driven to axially rotate, the turning action of the human hand is simulated, and the gear shifting is realized.
The fixing device is used for fixing the gear shifting assistant body 22 and the shell of the gear shifting switch, so that when the power output end of the motor 240 rotates, the gear shifting assistant body 22 is locked by the fixing device, and the gear shifting assistant body 22 is prevented from rotating along with the gear shifting assistant body.
Optionally, fig. 6 is a schematic structural diagram of a gear shifting assistant connection fixing device according to an embodiment of the present invention. On the basis of the above embodiments, as shown in fig. 6, in one embodiment, the fixing device includes a first adjusting lever 23 and a second adjusting lever 24, the first adjusting lever 23 and the second adjusting lever 24 are connected to both ends of the gear shifting assistant body 22;
the first adjusting rod 23 and the second adjusting rod 24 both comprise a supporting rod 231 and a movable rod 232, and the movable rod 232 is movably connected with the supporting rod 231 and can rotate relative to the supporting rod 231; one end of the supporting rod 231 is connected with the gear shifting assistant machine body 22, the other end of the supporting rod 231 is movably connected with one end of the movable rod 232, the other end of the movable rod 232 is provided with a fixing clamp 233, and the movable rod 232 is fixed with a shell of the gear shifting switch through the fixing clamp 233.
Specifically, the first adjustment lever 23 and the second adjustment lever 24 may be symmetrically disposed at upper and lower ends of the shift assistant body 22. The connection between the support rod 231 and the shift assistant body 22 may be provided with a tightening mechanism 234 such as a disk bolt, so that the support rods 231 at the upper and lower ends can rotate relative to the shift assistant body 22.
The fixing clip 233 may be, for example, an alligator clamp, the first adjusting lever 23 is fixed to an upper edge of the shift switch housing by the alligator clamp provided at an upper end portion thereof, and the second adjusting lever 24 is fixed to a lower edge of the shift switch housing by the alligator clamp provided at a lower end portion thereof.
Optionally, a tightening mechanism 234 is arranged at the connection end of the movable rod 232 and the support rod 231;
when the tightening mechanism 234 is in a loosened state, the movable rod 232 can rotate relative to the support rod 231;
when the tightening mechanism 234 is in a tightened state, the movable rod 232 is fixed in position relative to the support rod 231.
Specifically, the tightening mechanism 234 may be, for example, a disk bolt. Before gear shifting is carried out, the movable rod 232 can rotate relative to the supporting rod 231 by adjusting the disc-shaped bolt, so that the rotary handle 21 of the gear shifting assistant 20 correspondingly clamps the gear shifting switch, after the gear shifting assistant 20 is placed, the movable rod 232 and/or the supporting rod 231 are/is rotated to a proper angle, and then the disc-shaped bolt is in a tensioning state by adjusting the disc-shaped bolt, so that the position of the movable rod 232 relative to the supporting rod 231 is controlled to be fixed, and the gear shifting assistant body 22 and the gear shifting switch shell are fixed.
In another optional implementation manner of this embodiment, each of the first adjustment lever 23 and the second adjustment lever 24 includes a support rod 231 and a movable rod 232, and the movable rod 232 is sleeved outside the support rod 231 and can move relative to the support rod 231; one end of the support rod 231 is connected with the gear shifting assistant body 22, one end of the movable rod 232, which is far away from the gear shifting assistant 20, is provided with a fixed clamp 233, and the movable rod 232 is fixed with a shell of the gear shifting switch through the fixed clamp 233. Therefore, the first adjusting rod 23 and the second adjusting rod 24 are adjusted in length in a telescopic manner, and the gear shifting assistant 20 is fixed with the shell of the gear shifting switch.
Optionally, with continued reference to fig. 4, the gear shifting assistant 20 further includes a power module 250, the power module 250 is connected to the controller 220, and the controller 220 is further configured to detect the power information of the power module 250 and send the power information to the test host 10 through the communication module 210.
Specifically, the shift assistant 20 provides power to the various components through a configured power module 250, enabling the shift assistant 20 to operate independently.
The controller 220 in the gear shifting assistant 20 collects the electric quantity information of the power supply module 250 and sends the electric quantity information to the test host 10, so that the tester operator can monitor the residual electric quantity of the gear shifting assistant 20 in real time, and the tester operator can conveniently confirm whether the gear shifting assistant 20 needs to be charged.
Optionally, with continued reference to fig. 4, the test host 10 further includes a display module 170 and a print module 180;
the display module 170 is connected to the main control module 130, and the display module 170 is configured to display a dc resistance target value, a temperature detection value, a humidity detection value, current gear information of the gear shifting assistant, and electric quantity information of the gear shifting assistant 20;
the printing module 180 is connected to the main control module 130, and the printing module 180 is configured to print test data including at least a dc resistance target value in response to the main control module 130.
Specifically, the display module 170 may be, for example, a display screen, and by configuring the display module 170, the data acquired by the temperature and humidity detection module may be displayed on the display screen at the same time for the tester operator to refer to, so as to determine whether the current temperature and humidity satisfy the test conditions. Meanwhile, the operator of the tester can check the test result and the test data in time so as to find out possible problems in the test process in time.
The printing module 180 prints the test data according to the set printing mode and the set printing parameters. The print content may include, for example, header information, test data information, and the like.
Optionally, with continued reference to fig. 4, the test host 10 further includes a storage module 190 and a voice module 191, where the storage module 190 is used for storing test data, and the voice module 191 is used for performing voice prompt on an operator of the tester during the test process. For example, when the test host 10 receives a feedback signal of completion of gear shifting sent by the gear shifting assistant 20, the voice module 191 may send a voice prompt message of "please test for completion of gear shifting"; or when the test is finished, the voice module 191 can send out a voice prompt message of 'please discharge the test is finished'; or directly carrying out voice broadcast on the test result, and the like.
Optionally, with continued reference to fig. 4, the resistance testing module 120 in the testing host 10 further includes a magnetic assisting module 123, a self-discharging module 124, and a leakage protection module 125; wherein the content of the first and second substances,
the magnetism assisting module 123 is used for eliminating the induced electromagnetic signal after the test is completed, and preventing interference on subsequent test results.
The self-discharge module 124 is used to eliminate the charge generated during power-up, preventing charge accumulation.
The leakage protection module 125 may be, for example, an air switch, and may perform overload protection on the test host 10 to prevent the current in the circuit from damaging the test host 10 when the current exceeds the rated current due to the circuit fault.
Optionally, fig. 7 is a flowchart of temperature conversion performed by the dc resistance tester according to the embodiment of the present invention, and referring to fig. 7, a process of performing temperature conversion by the test host specifically includes:
and S710, starting.
S720, a temperature acquisition module in the test host machine selects the temperature.
S721, detecting the ambient temperature by a temperature and humidity detection module to obtain a temperature detection value;
s722, the temperature acquisition module acquires corresponding temperature information by calling detection data of the temperature and humidity module;
when the winding temperature of the transformer is inconsistent with the ambient temperature, the following steps are carried out:
s723, reading the temperature of the transformer winding by a tester operator through a thermometer in the transformer winding;
and S724, manually inputting the temperature through a temperature setting module by a tester operator, so that the temperature acquisition module can acquire the temperature value of the transformer winding.
And S730, finishing the setting.
After the setting is finished, the main control module can send a trigger instruction to the voice module so as to instruct the voice module to carry out voice broadcasting.
And S740, gear determination.
And S750, measuring the resistance.
The main control module in the test host instructs the resistance test module to input a test signal to the transformer, and the main control module further calculates according to the test signal and the response signal output by the resistance test module to obtain an initial value of the direct current resistance.
And S760, temperature conversion.
The main control module in the test host converts the direct current resistance initial value according to the following formula to obtain the direct current resistance target value.
Where T1 is the current temperature, T2 is the target temperature, R1 is the resistance value at T1 temperature, R2 is the resistance value at T2 temperature, and T is the resistance temperature constant.
And S770, displaying and storing the data at the two temperatures.
The main control module in the test host correspondingly displays the direct current resistance initial value, the direct current resistance target value and the corresponding temperature through the display module and stores the direct current resistance initial value, the direct current resistance target value and the corresponding temperature through the storage module.
Optionally, fig. 8 is a gear shifting flowchart of the dc resistance tester provided in the embodiment of the present invention, and referring to fig. 8, the gear shifting process specifically includes:
and S810, starting.
And S820, determining the current gear.
The main control module in the test host determines the current gear of an on-load switch of the transformer and judges whether upshifting or downshifting is needed or not based on the current gear. In particular, the amount of the solvent to be used,
s821, if necessary, upshifting;
s822, the main control module further judges whether the current gear reaches the highest gear; for example, whether the 17 th gear of the on-load switch of the transformer is reached or not is judged, when the highest gear is reached, the main control module prompts that the current gear is the highest gear, and corresponding prompt information is displayed through the display module or voice broadcasting is carried out through the voice module; when the highest gear is not reached, the process proceeds to step S830.
S823, if downshifting is needed;
s824, the main control module further judges whether the current gear of the on-load switch reaches the lowest gear, if the on-load switch is at the lowest gear, the main control module prompts that the current gear is the lowest gear, and the prompt information is correspondingly displayed through the display module or voice broadcast is carried out; if the on-load switch is not currently in the lowest gear, the process proceeds to step S830.
And S830, the gear adjusting module sends a gear shifting command.
S840, the gear shifting assistant receives the gear shifting command.
And S850, determining the rotation direction by the gear shifting assistant.
The controller in the gear shifting assistant analyzes the gear shifting command to determine whether the gear shifting command is an upshift command or a downshift command, and further determines the rotating direction of the rotating handle of the gear shifting rotating handle. Alternatively, the upshift command may be a clockwise rotation and the downshift command may be a counterclockwise rotation.
And S860, finishing gear shifting.
S870, the gear shifting assistant sends a completion instruction.
And S880, the gear shifting module receives the instruction.
The main control module in the test host machine processes information and prepares for testing.
And S890, displaying the latest gear and prompting to start measurement.
The main control module in the test host correspondingly displays the current gear information through the display module and generates prompt information to indicate that a tester operator can test.
Optionally, fig. 9 is a flowchart of resistance testing performed by the dc resistance tester according to the embodiment of the present invention, and referring to fig. 9, the resistance testing process specifically includes:
s910, start.
And S920, setting the temperature.
The tester operator can manually input the winding temperature of the transformer according to the current running condition of the transformer, and the winding temperature of the transformer can be directly read through a thermometer in the transformer. Or when the winding temperature of the transformer is consistent with the ambient temperature, the temperature detection value output by the temperature and humidity detection module can be directly used as the current temperature without manual input.
And S930, gear adjustment.
The main control module in the test host sends a corresponding gear shifting command to the gear shifting assistant through the gear adjusting module, and the gear shifting assistant responds to the gear shifting command to adjust the gear of the on-load switch of the transformer.
And S940, resistance testing.
The main control module in the test host instructs the resistance test module to input a test signal to the transformer, and the main control module further calculates according to the test signal and the response signal output by the resistance test module to obtain an initial value of the direct current resistance.
And S950, data conversion.
The main control module in the test host performs temperature conversion on the direct current resistance initial value according to the temperature information output by the temperature acquisition module to obtain a direct current resistance target value.
And S960, displaying the result.
And S970, judging whether the test is finished.
If the test is completed, step S980 is entered, and if the test is not completed, step S930 is returned to for gear adjustment, and the dc resistance test is continued for the new gear until the test is completed.
And S980, printing the data.
And S990, voice prompt.
The main control module in the test host broadcasts prompt information such as 'please discharge after the test' to the tester operator through the voice module.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A DC resistance tester, comprising a test host, wherein the test host comprises:
the temperature acquisition module is used for acquiring the temperature of the device to be measured;
the resistance testing module is connected with the device to be tested and used for inputting a testing signal to the device to be tested and detecting a response signal of the device to be tested to the testing signal;
and the main control module is respectively connected with the temperature acquisition module and the resistance test module, and is used for determining a direct current resistance initial value of the device to be tested according to the response signal and the test signal and converting the direct current resistance initial value according to the temperature to obtain a direct current resistance target value.
2. The direct current resistance tester of claim 1, wherein the test host further comprises a gear adjusting module, the gear adjusting module is connected with the main control module, and the gear adjusting module is used for responding to the main control module to output a gear shifting command;
the tester also comprises a gear shifting assistant, the gear shifting assistant is connected with a gear shifting switch of the device to be tested, the gear shifting assistant is in communication connection with the gear adjusting module, and the gear shifting assistant is used for responding to the gear shifting command to adjust the gear of the device to be tested.
3. The dc resistance tester of claim 2, wherein the shift assistant comprises:
the communication module is used for communicating with the gear adjusting module and receiving the gear shifting command;
the controller is connected with the communication module and used for analyzing the gear shifting command and outputting a gear shifting signal based on an analysis result;
the driving module is connected with the controller and used for responding to the gear shifting signal to generate a driving signal;
the motor, the signal input part of motor connects drive module, the output of motor is connected with rotatory handle, rotatory handle be used for with the gear shifting switch of the device to be measured is connected, the motor is used for responding drive signal adjusts the gear shifting switch, it is right to carry out the gear adjustment to the device to be measured.
4. The direct current resistance tester of claim 3, wherein a groove is arranged at the connection end of the rotating handle and the gear shifting switch, the size of the groove is matched with the width of the gear shifting switch, and the rotating handle of the gear shifting assistant is connected with the gear shifting switch of the device to be tested through the groove;
the body of the gear shifting assistant is connected with a fixing device, and when the gear shifting assistant is in a test state, the body of the gear shifting assistant is fixed on a shell of the gear shifting switch through the fixing device.
5. The direct current resistance tester of claim 4, wherein the fixing device comprises a first adjusting rod and a second adjusting rod, and the first adjusting rod and the second adjusting rod are connected to two ends of the body of the gear shifting assistant;
the first adjusting rod and the second adjusting rod both comprise a supporting rod and a movable rod, and the movable rod is movably connected with the supporting rod and can rotate relative to the supporting rod; one end of the supporting rod is connected with the body of the gear shifting assistant, the other end of the supporting rod is movably connected with one end of the movable rod, the other end of the movable rod is provided with a fixing clamp, and the movable rod is fixed with the shell of the gear shifting switch through the fixing clamp.
6. The direct current resistance tester of claim 5, wherein the connection end of the movable rod and the support rod is provided with a tightening mechanism;
when the tightening mechanism is in a loosening state, the movable rod can rotate relative to the supporting rod;
when the tightening mechanism is in a tensioning state, the movable rod is fixed relative to the support rod.
7. The DC resistance tester of claim 3, wherein the gear shifting assistant further comprises a power module, the power module is connected to the controller, and the controller is further configured to detect power information of the power module and send the power information to the test host through the communication module.
8. The direct current resistance tester of claim 1, wherein the resistance testing module comprises a current output module and a power acquisition module;
the current output module is used for outputting a current test signal;
the electric quantity acquisition module is used for acquiring the voltage of the output end of the device to be tested as a voltage response signal;
the main control module is used for determining the initial value of the direct current resistance according to the current test signal and the voltage response signal.
9. The direct current resistance tester of claim 1, wherein the test host further comprises a temperature setting module and a temperature and humidity detection module, and the temperature setting module and the temperature and humidity detection module are respectively connected to the temperature acquisition module;
the temperature setting module is used for inputting a temperature setting value;
the temperature and humidity detection module is used for detecting the ambient temperature and the ambient humidity and outputting a temperature detection value and a humidity detection value;
the temperature acquisition module is used for determining the temperature set value or the temperature detection value as the temperature of the device to be detected.
10. The direct current resistance tester of claim 9, wherein the test host further comprises a display module and a printing module;
the display module is connected with the main control module and is used for displaying the direct current resistance target value, the temperature detection value, the humidity detection value, the current gear information of the gear shifting assistant and the electric quantity information of the gear shifting assistant;
the printing module is connected with the main control module and is used for responding to the main control module to print test data at least comprising the direct current resistance target value.
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| CN202010451430.0A CN111596132A (en) | 2020-05-25 | 2020-05-25 | DC resistance tester |
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| CN202010451430.0A CN111596132A (en) | 2020-05-25 | 2020-05-25 | DC resistance tester |
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Application publication date: 20200828 |