CN217739312U - Multifunctional transformer parameter testing device - Google Patents
Multifunctional transformer parameter testing device Download PDFInfo
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- CN217739312U CN217739312U CN202221596090.1U CN202221596090U CN217739312U CN 217739312 U CN217739312 U CN 217739312U CN 202221596090 U CN202221596090 U CN 202221596090U CN 217739312 U CN217739312 U CN 217739312U
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Abstract
The utility model discloses a multi-functional transformer parameter testing arrangement, including integrated core control platform in an equipment cabinet body, power module, the relay switches the module, the wiring end module, communication interface module, and be used for detecting the direct current resistance measuring module of the different test data of transformer, insulation resistance measuring module, the transformation ratio measuring module, there is load switch test module, dielectric loss measuring module, short-circuit impedance measuring module and winding deformation test module, each function test module switches the module through the relay respectively and is connected with power module, the transformer that is surveyed passes through the wiring end module and is connected with each function test module respectively, core control platform passes through communication interface module and relay switching module and is connected. The utility model discloses can shorten the time of transformer test maintenance effectively, reduce maintenance work personnel intensity of labour, improve maintenance personnel work efficiency.
Description
Technical Field
The utility model relates to an electric power detects technical field, concretely relates to multi-functional transformer parameter testing device.
Background
In order to ensure the safe operation of the basic equipment of the power supply system, the electric power operation maintenance unit can carry out regular or irregular overhaul tests on important equipment such as a power transformer and the like according to actual conditions, so that faults or hidden dangers can be found and eliminated. The electrical overhaul test is to find the hidden trouble of the equipment in operation, prevent accidents or equipment damage, and inspect, test or monitor the equipment, is an important link in the operation and maintenance work of the electrical equipment, and is one of effective means for ensuring the safe operation of the electrical equipment.
At present, the apparatus used for overhauling the transformer and the switch mainly comprises a transformer direct resistance tester, a transformation ratio tester, an insulation resistance tester, a switch characteristic tester, a loop resistance tester, an action coil resistance tester and the like. The weight of each piece of equipment plus the test lead is about 10 kilograms, and the total weight is about 60-80 kilograms. Each time of overhaul test needs to carry various test equipment such as special test equipment of the test project, each kind of equipment only has a test function, each set of equipment all comprises a mainframe box and an accessory box, a plurality of test equipment need to be carried to the scene during each time of detection test, and in addition to other auxiliary appliances, the quantity of equipment that needs to be carried in each time of test work is a lot. Most of the current test equipment is operated by a key, and some operation processes are complex. In addition, the display screen of the existing equipment is small in size, and results are not easy to view. Moreover, each kind of equipment adopts a special test line, the sharing performance is poor, the test line needs to be reconnected when the test items are replaced each time, the workload of field operators is large, and the equipment is easy to be burnt out even due to wrong connection of the test data.
SUMMERY OF THE UTILITY MODEL
In order to solve the defect that above-mentioned technique exists, the utility model provides a multi-functional transformer parameter testing device.
The utility model discloses realize that the technical scheme that above-mentioned technological effect adopted is:
a multifunctional transformer parameter testing device comprises a core control platform, a power supply module, a relay switching module, a wiring terminal module, a communication interface module, a direct current resistance measuring module, an insulation resistance measuring module, a transformation ratio measuring module, an on-load switch testing module, a dielectric loss measuring module, a short-circuit impedance measuring module and a winding deformation testing module, wherein the direct current resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the on-load switch testing module, the dielectric loss measuring module and the winding deformation testing module are integrated in an equipment cabinet body, the direct current resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the on-load switch testing module, the dielectric loss measuring module and the winding deformation testing module are used for detecting different testing data of a transformer, the direct current resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the on-load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module and the winding deformation testing module are respectively connected with the power supply module through the relay switching module, a tested transformer is respectively connected with the direct current resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the on-load switch testing module, the dielectric loss measuring module, the short-circuit deformation testing module and the short-circuit testing module.
Preferably, in the above multifunctional transformer parameter testing apparatus, the relay switching module includes seven relays, and the relays are connected to the dc resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the on-load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module, and the winding deformation testing module in a one-to-one correspondence manner, an output end of the power supply module is connected to a moving point common end of the relay switching module by using a power line, and a normally open point of each relay is correspondingly connected to power ends of the dc resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the on-load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module, and the winding deformation testing module.
Preferably, in the multifunctional transformer parameter testing device, the communication interface module includes an RS232 communication interface and a USB communication interface, and the core control platform is connected to the control end of the relay switching module through the RS232 communication interface and an RS232 communication line, and is configured to output a control instruction and control the corresponding relay to switch on the power supply.
Preferably, in the above multifunctional transformer parameter testing device, the wiring terminal module includes a wiring panel and a plurality of wiring terminals fixed on the wiring panel, the input ends of the dc resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the on-load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module, and the winding deformation testing module are respectively connected to corresponding wiring terminals, the corresponding wiring terminals and the tested transformer are connected by test wires, and the corresponding detection circuit is switched on.
Preferably, in the multifunctional transformer parameter testing device, the power module is externally connected with an AC220V power supply.
Preferably, in the multifunctional transformer parameter testing device, the core control platform is connected with a 12-inch touch display screen.
Preferably, in the multifunctional transformer parameter testing device, the core control platform is an industrial personal computer.
The utility model has the advantages that: the utility model discloses a multi-functional transformer parameter testing arrangement is integrated as an organic whole through with multiple different function test module for multinomial conventional test function melts to a system, and on-the-spot convenient to use need not carry the instrument of many different test projects, just can accomplish the high-efficient of transformer power failure test project and detect, has overcome a great deal of inconvenience that the use conventional instrument and equipment is experimental to bring, and the wiring is convenient, has reduced test wiring work load, has alleviateed equipment weight.
Drawings
Fig. 1 is a block diagram of the principle modules of the present invention;
fig. 2 is a circuit block diagram of the dc resistance measuring module according to the present invention;
fig. 3 is a circuit block diagram of the insulation resistance measuring module according to the present invention;
fig. 4 is a circuit block diagram of the transformation ratio measuring module of the present invention;
fig. 5 is a circuit block diagram of the dielectric loss measuring module according to the present invention.
Detailed Description
For a further understanding of the invention, reference is made to the following description taken in conjunction with the accompanying drawings and specific examples, in which:
in the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Please refer to fig. 1, as shown in the figure, the embodiment of the present invention provides a multifunctional transformer parameter testing apparatus, which comprises a core control platform integrated in an apparatus cabinet, a power module, a relay switching module, a wiring terminal module, a communication interface module, and a dc resistance measuring module, an insulation resistance measuring module, a transformation ratio measuring module, a load switch testing module, a dielectric loss measuring module, a short circuit impedance measuring module, and a winding deformation testing module for detecting different testing data of a transformer. The direct current resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module and the winding deformation testing module are connected with the power supply module through the relay switching module respectively. The tested transformer is respectively connected with the direct current resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module and the winding deformation testing module through the wiring terminal module. The core control platform is respectively connected with the direct current resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module and the winding deformation testing module through the communication interface module and is used for receiving the testing data output by the different function testing modules. The core control platform is connected with the relay switching module through the communication interface module, and circuit on-off control over the relay switching module can be achieved through the core control platform, so that the corresponding function testing module can be independently switched on to work. Through the inside exclusive formula power supply mode of multichannel equipment that adopts, only test function circuit work alone all the way at every moment promptly, each functional test module can realize keeping apart each other, and each other does not interfere with the flexibility, is favorable to the maintenance and the renewal of equipment.
Further, in the preferred embodiment of the utility model, this relay switching module includes seven relays, with direct current resistance measurement module, insulation resistance measurement module, transformation ratio measurement module, there is load switch test module, dielectric loss measurement module, short-circuit impedance measurement module, winding deformation test module one-to-one is connected, power module's output adopts the power cord to be connected to the moving point public end of relay switching module, the normal open point of each relay is corresponding to be connected to direct current resistance measurement module, insulation resistance measurement module, transformation ratio measurement module, there is load switch test module, dielectric loss measurement module, short-circuit impedance measurement module, winding deformation test module's power end. The communication interface module comprises an RS232 communication interface and a USB communication interface, and the core control platform is connected with the control end of the relay switching module through the RS232 communication interface and an RS232 communication line and used for outputting a control command and controlling the corresponding relay to be switched on. The relay switching module is connected to a control end of the relay switching module through an RS232 communication line, and the core control platform controls the on-off of the corresponding relay through outputting a control instruction, so that the power supply for only one functional measurement module at the same time can be controlled. The test data can be exported through the USB communication interface and the USB communication line, and the data report can output a printing format or an electronic document according to a template provided by a user, so that the comprehensive comparison and analysis of the data are facilitated.
Further, in the preferred embodiment of the present invention, the terminal module includes a terminal panel and a plurality of terminals fixed on the terminal panel, the input of the dc resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the load switch testing module, the dielectric loss measuring module, the short circuit impedance measuring module, and the winding deformation testing module is respectively connected to the corresponding terminal, the corresponding terminal and the tested transformer are connected through the testing wire, and the connection corresponds to the detection circuit. The utility model discloses in, the external AC220V power of power module, core control platform are connected with 12 cun touch display screens, and core control platform is the industrial computer. The measured data can return to the core control platform through the communication interface module for data storage, and can be displayed on the 12-inch touch display screen, and meanwhile, the 12-inch touch display screen can be used for inputting operation control instructions to the core control platform.
Further, in the embodiment of the present invention, as shown in fig. 2 to fig. 5, the circuit block diagram of the dc resistance measuring module, the circuit block diagram of the insulation resistance measuring module, the circuit block diagram of the transformation ratio measuring module, and the circuit block diagram of the dielectric loss measuring module are shown respectively. As shown in fig. 2, the direct current resistance measurement module includes a constant current output source, a discharge protection circuit, a resistor Rx, a signal processing circuit, a high speed a/D sampler, an ARM processor, a constant current output control circuit and a communication interface, the core control platform is connected with the ARM processor through the communication interface, the constant current output control circuit is connected with the ARM processor, the constant current output control circuit is connected with the constant current output source, the constant current output source is connected with the resistor Rx through the discharge protection circuit, the resistor Rx is connected with the high speed a/D sampler through the signal processing circuit, and the signal processing circuit and the high speed a/D sampler are respectively connected with the ARM processor. The direct current resistance measurement module loads constant current to the tested transformer through a constant current source generating direct current, the current generates corresponding voltage values at two ends of the tested transformer, the voltage values at two ends of the tested transformer are sampled, and then the resistance value is calculated by using ohm's law. The direct current resistance measuring module adopts a typical four-wire system measuring method so as to improve the accuracy of resistance measurement. The direct current resistance measurement module is composed of a constant current output source, a signal processing circuit and an A/D converter to form a main body of the measurement circuit, the ARM processor applies constant and high-precision current to an external tested transformer by controlling the constant current output source, then processes sampling data (including test voltage, current test current and the like), and obtains an actual resistance value through calculation.
As shown in fig. 3, the insulation resistance measuring module includes a voltage doubling rectifying circuit, a current-voltage converter, a high voltage sampling circuit, a high voltage output control circuit, an a/D converter, a communication interface, and an ARM processor. The specific connection relationship is as shown in fig. 3, the device outputs the direct-current high voltage generated by the direct-current power supply through the DC/DC conversion to the transformer to be tested, so as to generate a current from E to L pole, the current is converted into a voltage value through the current-voltage converter, then the voltage value is converted through the a/D converter and then transmitted to the ARM processor for calculation processing to obtain a resistance value, and then the resistance value is transmitted to the core control platform through the communication interface. As shown in fig. 4, the transformation ratio measuring module includes a signal sampling circuit, an a/D sampling circuit, a data processing circuit, an ARM processor, a control circuit, and a communication interface. The method comprises the steps of applying power supply voltage to a high-voltage end of a transformer, adopting a high-precision A/D sampling circuit to simultaneously obtain sampling voltages at the high-voltage end and a low-voltage end of the transformer, and then calculating the ratio of the voltages at the two sides to obtain the transformer transformation ratio. The on-load switch testing module is controlled by the RAM processor, and accurate measurement of parameters such as transition time, transition waveform, transition resistance, three-phase synchronism and the like of the on-load tap-changer is achieved through the internal measuring circuit. When the switch state changes, the processor changes the relative position on a time axis according to the state of each signal in the complete transition action data, and automatically calculates and displays each transition time parameter.
As shown in fig. 5, the dielectric loss measurement module includes a variable frequency power supply, a step-up transformer, a forward/reverse current detection circuit of the measured loop, a measurement and a/D conversion circuit, a communication interface, and a RAM processor. As shown in the figure, the circuit comprises a standard loop (Cn) and a tested loop (Cx), wherein the standard loop consists of a built-in standard high-stability capacitor and a measuring line, the tested loop consists of a tested article and a measuring line, and the measuring line consists of a sampling resistor, a preamplifier and an A/D converter. The amplitude and the phase of the standard loop current and the tested loop current are respectively measured by the measuring circuit and are collected by the high-speed sampling circuit in real time, and the capacitance value and the dielectric loss tangent value of the test article can be obtained by the single chip microcomputer system through vector operation. After the measurement is started, the program control variable frequency power supply adjusts the output voltage to a set value slowly at a constant speed by adopting an algorithm, and the measuring circuit adjusts the output high voltage to accurate high voltage output. According to the setting of positive/negative connection lines, the measuring circuit automatically selects input and switches measuring range according to test current, the measuring circuit adopts Fourier transform to filter out interference, separates out signal fundamental wave, carries out vector operation on standard current and test current, calculates amplitude value capacitance, calculates angle difference tg delta, repeatedly carries out multiple measurements, and selects an intermediate result through sequencing.
The on-load switch testing module is controlled by the RAM processor, and accurate measurement of parameters such as transition time, transition waveform, transition resistance, three-phase synchronism and the like of the on-load tap-changer is achieved through the internal measuring circuit. During testing, a direct current voltage is applied to the on-load tap-changer, and the closed state inside the on-load tap-changer is measured. After the switch acts, the sampling circuit automatically samples signals, the duration time of single sampling data is set, the RAM processor analyzes and processes the sampled data, and whether the opening and closing state of the on-load tap-changer changes or not is judged. When the switch state changes, the RAM processor automatically calculates and displays each transition time parameter according to the complete transition action, namely the relative position of the state transition of each path of signal in the data on a time axis.
The short-circuit impedance measurement module adopts a voltammetry method, the outgoing line on one side of the transformer is in short circuit before testing, the conducting wire for short circuit has enough sectional area, and the good contact of all outgoing line terminals is kept. The output voltage of the tester is applied to the other side of the tested transformer to generate the current flowing through the impedance, and the current and the voltage applied to the impedance are measured, and the ratio of the voltage to the fundamental component of the current is the short-circuit impedance of the tested transformer. In a transformer short-circuit impedance test, a voltage is generally applied to the high-voltage winding side of a transformer under test, and a short circuit is generally performed on the low-voltage winding side. In order to ensure the testing precision, the voltage measuring loop is directly connected to the outgoing line terminal of the tested transformer so as to avoid introducing voltage drop on the current lead. The short-circuit impedance test of the transformer is the most direct method for detecting whether the winding of the transformer is deformed or not after the transformer is impacted by short-circuit current in operation or the transformer is impacted by mechanical force in transportation and installation, and has important significance for judging whether the transformer can be put into operation or not.
And the winding deformation testing module is used for judging the winding deformation possibly generated by the transformer according to the change degree of the amplitude-frequency response characteristic by detecting the amplitude-frequency response characteristic of each winding of the transformer and comparing the detection result longitudinally or transversely. The system adopts a developed and perfected internal fault frequency response analysis method in developed countries in the world at present according to the measurement of the characteristic parameters of the windings in the transformer, and the internal fault of the transformer is accurately judged. Under the action of voltage with higher frequency, each winding of the transformer can be regarded as a passive linear dual-port network formed by distributed parameters such as linear resistance, inductance (mutual inductance), capacitance and the like, and the internal characteristics of the passive linear dual-port network can be described through a transfer function. If the winding is deformed, parameters such as distributed inductance and capacitance inside the winding are inevitably changed, so that the zero point and the pole of the equivalent network transfer function are changed, and the frequency response characteristic of the network is changed.
It should be noted that, in the embodiment of the utility model, the aforesaid functional test module, direct current resistance measurement module, insulation resistance measurement module, transformation ratio measurement module, on-load switch test module, dielectric loss measurement module, short-circuit impedance measurement module and winding deformation test module all adopt the relevant test measurement module among the current corresponding tester, and it measures the test principle unchangeable, the utility model discloses peel off the built-up connection with relevant test measurement module alone, through integrated design, constitute one and possess the equipment that measures different test data whole. The direct current resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the load switch testing module, the dielectric loss measuring module, the short circuit impedance measuring module and the winding deformation testing module are not described in detail herein.
To sum up, the utility model discloses need carry the use that a large amount of different functions's test equipment exists inconvenient to current transformer maintenance test time, the long shortcoming of test time through integrated design, realizes a plurality of functions realization integrated design commonly used among the transformer test, can shorten the time that the transformer test overhauld effectively, reduces maintenance staff intensity of labour, improves maintainer work efficiency.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, but is described in the embodiments and the description only to illustrate the principles of the invention and that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed, and the scope of the invention is defined by the appended claims and their equivalents.
Claims (7)
1. The utility model provides a multi-functional transformer parameter testing arrangement, its characterized in that, including integrated core control platform, power module, relay switching module, wiring end module, the communication interface module in an equipment cabinet body to and be used for detecting the direct current resistance measurement module of different test data of transformer, insulation resistance measurement module, transformation ratio measurement module, on-load switch test module, dielectric loss measurement module, short-circuit impedance measurement module and winding deformation test module, direct current resistance measurement module, insulation resistance measurement module, transformation ratio measurement module, on-load switch test module, dielectric loss measurement module, winding deformation test module pass through respectively the relay switching module with power module connects, the transformer under test pass through the wiring end module respectively with direct current resistance measurement module, insulation resistance measurement module, transformation ratio measurement module, on-load switch test module, dielectric loss measurement module, short-circuit impedance measurement module, winding deformation test module connect, the core control platform pass through the communication interface module respectively with direct current resistance measurement module, insulation resistance measurement module, transformation ratio measurement module, on-load switch test module, dielectric loss measurement module, short-circuit impedance measurement module, winding deformation test module connect through the communication interface module with the relay switching module.
2. The multifunctional transformer parameter testing device according to claim 1, wherein the relay switching module comprises seven relays, and the relays are connected with the dc resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the on-load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module, and the winding deformation testing module in a one-to-one correspondence manner, an output end of the power supply module is connected to a moving point common end of the relay switching module by using a power line, and a normally open point of each relay is correspondingly connected to power supply ends of the dc resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the on-load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module, and the winding deformation testing module.
3. The multifunctional transformer parameter testing device of claim 1, wherein the communication interface module comprises an RS232 communication interface and a USB communication interface, and the core control platform is connected to the control end of the relay switching module through the RS232 communication interface and an RS232 communication line, and is configured to output a control command to control a corresponding relay to switch on a power supply.
4. The multifunctional transformer parameter testing device of claim 1, wherein the wiring terminal module comprises a wiring panel and a plurality of wiring terminals fixed on the wiring panel, and the input ends of the dc resistance measuring module, the insulation resistance measuring module, the transformation ratio measuring module, the load switch testing module, the dielectric loss measuring module, the short-circuit impedance measuring module and the winding deformation testing module are respectively connected to corresponding wiring terminals, and are connected to corresponding wiring terminals and a tested transformer through testing wires to connect corresponding detection circuits.
5. The multifunctional transformer parameter testing device of claim 1, wherein the power module is externally connected to an AC220V power supply.
6. The multifunctional transformer parameter testing device of claim 1, wherein the core control platform is connected with a 12-inch touch display screen.
7. The multifunctional transformer parameter testing device according to claim 1, wherein the core control platform is an industrial personal computer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221596090.1U CN217739312U (en) | 2022-06-24 | 2022-06-24 | Multifunctional transformer parameter testing device |
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| CN202221596090.1U CN217739312U (en) | 2022-06-24 | 2022-06-24 | Multifunctional transformer parameter testing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116990625A (en) * | 2023-09-27 | 2023-11-03 | 国网江苏省电力有限公司电力科学研究院 | Function switching system and method of intelligent quick-checking device of distribution transformer |
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2022
- 2022-06-24 CN CN202221596090.1U patent/CN217739312U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116990625A (en) * | 2023-09-27 | 2023-11-03 | 国网江苏省电力有限公司电力科学研究院 | Function switching system and method of intelligent quick-checking device of distribution transformer |
| CN116990625B (en) * | 2023-09-27 | 2023-12-08 | 国网江苏省电力有限公司电力科学研究院 | Function switching system and method of intelligent quick-checking device of distribution transformer |
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