CN219065722U - Checking circuit and device for medium-low voltage current transformer - Google Patents
Checking circuit and device for medium-low voltage current transformer Download PDFInfo
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- CN219065722U CN219065722U CN202223121780.4U CN202223121780U CN219065722U CN 219065722 U CN219065722 U CN 219065722U CN 202223121780 U CN202223121780 U CN 202223121780U CN 219065722 U CN219065722 U CN 219065722U
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Abstract
The utility model provides a checking circuit and a checking device for a medium-low voltage current transformer, wherein the on-off of the whole main loop is controlled through a switch control circuit, the input voltage is regulated by a voltage regulator, a standard high-current signal for a test is generated through the current rising circuit and is input to a transformer checking instrument through a checking transfer switch, meanwhile, a tested high-current signal is output to the transformer checking instrument through the tested current transformer under the action of the multi-winding transformer mutual inductance output voltage, the transformer checking instrument obtains a measuring error according to the standard high-current signal and the tested high-current signal, the whole circuit is simple in structure, only needs to be connected with a small number of binding posts, the use is convenient, the uncertainty caused by wiring between lines is reduced, and the accuracy of a checking result is improved.
Description
Technical Field
The utility model relates to the technical field of transformer inspection, in particular to a checking circuit and device for a medium-voltage current transformer.
Background
The current in the lines of power generation, transformation, power transmission, power distribution and electricity consumption is greatly different from a few amperes to tens of thousands of amperes, the voltage on the other lines is generally higher for being conveniently measured, protected and controlled to be converted into more uniform current, if direct measurement is very dangerous, the current transformer can play a role in current transformation and electric isolation, if errors exceed the limit or the metering is inaccurate in the use process of the current transformer, the situation that the metering of the terminal electric energy is inaccurate is difficult to find in time, and the metering misalignment of the terminal electric energy is easy to cause, so that the verification of the current transformer is very important.
In the prior art, the current transformer is usually inspected by regular power failure and an inspection circuit is built on site, but the method introduces high voltage during the inspection on one hand, brings potential safety hazard to site operators, and on the other hand, the inspection circuit has the advantages of a large number of parts, extremely scattered parts, inconvenient construction, low operation efficiency and various inconveniences to residents in power utilization.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides a checking circuit and a checking device for a medium-voltage current transformer.
The technical scheme of the utility model is as follows: the utility model provides a well low-voltage current transformer check-up circuit, includes switch control circuit, voltage regulator, current-rising circuit, censoring change over switch and transformer check gauge, wherein:
the input end of the switch control circuit is electrically connected with an external power supply, the output end of the switch control circuit is electrically connected with a voltage regulator, and the switch control circuit is used for controlling the on-off of the whole main loop and providing input voltage, wherein the voltage regulator is used for regulating the input voltage;
the input end of the current rising circuit is electrically connected with the voltage regulator, and the output end of the current rising circuit is electrically connected with the sending and detecting change-over switch and is used for outputting a standard heavy current signal and a tested heavy current signal;
the censor transfer switch is electrically connected with the transformer calibrator and is used for transmitting the standard heavy current signal and the tested heavy current signal to the transformer calibrator for testing to obtain a measurement error.
Preferably, the switch control circuit includes a knife switch QS1, an emergency stop button B1, a zero switch Sz, a zero lamp X1, a relay KA1 and a relay KA2, wherein:
the two input ends of the knife switch QS1 are respectively and electrically connected with a zero line and a fire wire of an external 220V power supply, and an emergency stop button B1, a zero position switch Sz and a zero position lamp X1 are sequentially connected in series between the positive output end and the negative output end of the knife switch; the positive output end of the disconnecting link switch QS1 passes through a normally open contact KA1 of a relay KA1 1 The negative output end is electrically connected with the negative input end of the voltage regulator;
one end of a coil of the relay KA1 is electrically connected with the negative output end of the disconnecting link switch QS1, and the other end of the coil passes through the normally open contact KA1 2 Is electrically connected with the emergency stop button B1;
the two ends of the coil of the relay KA2 are connected with the two ends of the zero lamp X1 in parallel, and the normally open contact KA2 1 Normally open contact KA1 with relay KA1 2 Parallel normally closed contact KA2 2 Is electrically connected with the positive input end of the up-current circuit.
Preferably, the positive output end of the voltage regulator passes through a normally closed contact KA2 of a relay KA2 2 The negative output end is electrically connected with the negative input end of the current-rising circuit.
Preferably, the censoring transfer switch comprises two differential current signal input ends and two reference current signal input ends.
Preferably, the current up-converting circuit comprises a multi-winding transformer and a tested current transformer, wherein:
the multi-winding transformer comprises a first primary winding, a second primary winding and a secondary winding which are provided with two end binding posts, wherein the second primary winding and the secondary winding also comprise a plurality of center tap binding posts, and the tested current transformer comprises a primary winding and a secondary winding;
the positive input end of the first primary winding is in contact with a normally closed contact KA2 of a relay KA2 2 The negative input end is electrically connected with the negative output end of the voltage regulator;
the two ends of the primary winding of the tested current transformer are electrically connected with any one of two end binding posts and a plurality of center tap binding posts of the secondary winding of the multi-winding transformer; one end of a secondary winding of the tested current transformer is electrically connected with one end binding post of a second primary winding of the multi-winding transformer, and the other end of the secondary winding of the tested current transformer is electrically connected with one reference current signal end of the censor through a current load Ri;
one end of the second primary winding of the multi-winding transformer, which is electrically connected with the secondary winding of the tested current transformer, is also electrically connected with the differential current signal input end of the censor change-over switch, and the other end binding post and any binding post of the plurality of center tap binding posts are electrically connected with the censor change-over reference current signal end.
Preferably, the medium-voltage current transformer verification circuit further comprises a wiring panel, wherein a first differential current signal wiring terminal, a second differential current signal wiring terminal, a first reference current signal wiring terminal and a second reference current signal wiring terminal are arranged on the wiring panel, and the medium-voltage current transformer verification circuit comprises:
the first differential current signal binding post is used for connecting a second primary winding of the multi-winding transformer with one differential current signal input end of the censoring change-over switch;
the second differential current signal binding post is electrically connected with the other differential current signal input end of the censoring change-over switch;
the first reference current signal binding post is electrically connected with one reference current signal input end of the censoring change-over switch;
the second reference current signal binding post is electrically connected with the other reference current signal input end of the inspection transfer switch.
Preferably, the medium-low voltage current transformer verification circuit further comprises a display screen, and the display screen is electrically connected with the output end of the transformer verification instrument and used for displaying measurement errors.
The utility model also provides a checking device of the medium-low voltage current transformer, which is characterized in that a checking circuit of the medium-low voltage current transformer is arranged in the device, and a display screen of the checking circuit of the medium-low voltage current transformer is arranged on the outer wall of the device.
Compared with the prior art, the utility model has the beneficial effects that:
1. the utility model relates to a checking circuit of a medium-voltage current transformer, which is characterized in that a zero position switch Sz is arranged to control whether a current rising circuit outputs current or not, and the current rising circuit is displayed through a zero position lamp X1, so that an operator can know whether the current rising circuit outputs a standard large current signal of an experiment in real time;
2. the utility model relates to a checking circuit of a medium-voltage current transformer, which is provided with an emergency stop button B1, and can disconnect the power supply of a switch control circuit under abnormal or emergency conditions, so that the power supplies of a voltage regulator and a current rising circuit are disconnected, and the safety of operators is ensured;
3. the utility model relates to a checking circuit of a medium-voltage current transformer, which has a simple structure, is convenient to use and reduces the uncertainty caused by wiring of a circuit, and only needs to be connected with a small amount of wiring.
Drawings
Fig. 1 is a schematic structural diagram of a checking circuit of a medium-low voltage current transformer according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
As shown in fig. 1, the embodiment provides a checking circuit of a medium-low voltage current transformer, which comprises a switch control circuit, a voltage regulator, an up-flow circuit, a checking transfer switch and a transformer checking instrument, wherein the on-off of the whole main loop is controlled by the switch control circuit, the voltage regulator regulates the input voltage, a standard high-current signal for testing is generated by the up-flow circuit and is input to the transformer checking instrument through the checking transfer switch, and meanwhile, the tested high-current signal is output to the transformer checking instrument by the tested current transformer under the action of the multi-winding transformer mutual inductance output voltage, the transformer checking instrument obtains a measuring error according to the standard high-current signal and the tested high-current signal, the whole circuit has a simple structure, only needs to be connected with a small number of binding posts, is convenient to use, reduces the uncertainty caused by wiring between lines, and improves the accuracy of checking results;
specifically, in the present embodiment:
t1 the input of switch control circuit is connected with external power supply electricity, and the output is connected with the voltage regulator electricity for control whole main loop break-make and provide input voltage, concretely, switch control circuit includes switch QS1, scram button B1, zero switch Sz, zero lamp X1, relay KA1 and relay KA2, wherein:
whether the current rising circuit outputs current or not can be controlled by setting the zero position switch Sz, and the output result is displayed by the zero position lamp X1, so that operators can conveniently know whether the current rising circuit has a standard large current signal of an output experiment or not in real time;
the coils of the relay KA1 and the relay KA2 are controlled to be on and off, so that the contact actions of the relay KA1 and the relay KA2 are controlled to further control the on-off of the voltage regulator and the current-rising circuit, and the output of the experiment standard large current signal output by the current-rising circuit is realized;
through setting up scram button B1, can break off under unusual or emergency the power of switch control circuit to make the power disconnection of voltage regulator and step-up circuit, guarantee operating personnel's safety:
in this embodiment, the specific connection manner of the switch control circuit is:
the two input ends of the knife switch QS1 are respectively and electrically connected with a zero line and a fire wire of an external 220V power supply, and an emergency stop button B1, a zero position switch Sz and a zero position lamp X1 are sequentially connected in series between the positive output end and the negative output end of the knife switch;
the positive output end of the disconnecting link switch QS1 passes through a normally open contact KA1 of a relay KA1 1 The negative output end is electrically connected with the negative input end of the voltage regulator;
one end of a coil of the relay KA1 is electrically connected with the negative output end of the disconnecting link switch QS1, and the other end of the coil passes through the normally open contact KA1 2 Is electrically connected with the emergency stop button B1;
the two ends of the coil of the relay KA2 are connected with the two ends of the zero lamp X1 in parallel, and the normally open contact KA2 1 Normally open contact KA1 with relay KA1 2 Parallel normally closed contact KA2 2 The positive input end of the current-up circuit is electrically connected with the positive input end of the current-up circuit;
the current-boosting circuit comprises a multi-winding transformer and a tested current transformer, the multi-winding transformer comprises a first primary winding, a second primary winding and a secondary winding which are provided with two end binding posts, the second primary winding and the secondary winding also comprise a plurality of center tap binding posts, and the tested current transformer comprises a primary winding and a secondary winding, and the input ends of the primary winding and the secondary winding are electrically connected with the voltage regulator; the current-rising circuit output end is electrically connected with the checking transfer switch and is used for outputting a standard heavy current signal and a tested heavy current signal, wherein:
the voltage regulator is used for adjusting a switch control circuitThe positive output end of the provided input voltage passes through the normally closed contact KA2 of the relay KA2 2 The negative output end is electrically connected with the negative input end of the current-rising circuit;
the detection transfer switch wiring terminals are electrically connected with wiring terminals of the transformer calibrator in a one-to-one correspondence manner, and comprise two differential current signal input ends and two reference current signal input ends, and are used for transmitting a standard heavy current signal and a tested heavy current signal to the transformer calibrator for testing to obtain a measurement error;
specifically, in this example, the connection manner of the up-current circuit is:
the positive input end of the first primary winding is in contact with a normally closed contact KA2 of a relay KA2 2 The negative input end is electrically connected with the negative output end of the voltage regulator;
the two ends of the primary winding of the tested current transformer are electrically connected with any one of two end binding posts and a plurality of center tap binding posts of the secondary winding of the multi-winding transformer; one end of a secondary winding of the tested current transformer is electrically connected with one end binding post of a second primary winding of the multi-winding transformer, and the other end of the secondary winding of the tested current transformer is electrically connected with one reference current signal end of the censor through a current load Ri;
one end of the second primary winding of the multi-winding transformer, which is electrically connected with the secondary winding of the tested current transformer, is also electrically connected with the differential current signal input end of the censor change-over switch, and the other end binding post and any binding post of the plurality of center tap binding posts are electrically connected with the censor change-over reference current signal end;
after a first primary winding of the multi-winding transformer is electrified, mutual inductance is formed between the first primary winding and the second primary winding and between the first primary winding and a secondary winding through an iron core, so that voltage is output at the output end of the secondary winding, a power supply is provided for a tested current transformer, the tested current transformer outputs a tested large current signal, the second primary winding is used as a standard transformer to output a standard large current signal, and a transformer calibrator obtains the standard large current signal and the tested large current signal through a sending and detecting change-over switch to test, so that a test error is obtained;
it should be noted that, in practice, the plurality of center tap binding posts included in the secondary winding correspond to a plurality of measuring ranges, for example, in this embodiment, L is a common end, and L1, L2, L3 and L4 correspond to measuring ranges of 10-25A, 30-75A, 100-250A and 300-600A, so as to select a suitable access measuring range according to practical needs.
T3, optionally, in one or more embodiments of the present utility model, the checking circuit of the medium-low voltage current transformer further includes a wiring panel, on which a first differential current signal terminal, a second differential current signal terminal, a first reference current signal terminal, and a second reference current signal terminal are disposed, wherein:
the first differential current signal binding post is used for connecting a second primary winding of the multi-winding transformer with one differential current signal input end of the censoring change-over switch; the second differential current signal binding post is electrically connected with the other differential current signal input end of the censoring change-over switch; the first reference current signal binding post is electrically connected with one reference current signal input end of the censoring change-over switch; the second reference current signal binding post is electrically connected with the other reference current signal input end of the censorship change-over switch;
the wiring terminals of the second primary winding are conveniently connected with the wiring terminals of the inspection transfer switch by arranging the first differential current signal wiring terminal, the second differential current signal wiring terminal, the first reference current signal wiring terminal and the second reference current signal wiring terminal on the wiring board, so that the operation efficiency is improved, and the personal safety of operators is also improved;
in the embodiment, in T2, the electrical connection between the other end terminal and any one of the plurality of center tap terminals and the censored converting reference current signal terminal is actually that the other end terminal and the plurality of center tap terminals of the second primary winding are electrically connected to the first reference current signal terminal on the wiring panel through the corresponding switches Ki (K, K1, K2 … Kn), and the first reference current signal terminal is electrically connected to one reference current signal input terminal of the censored converting switch;
t4, optionally, in one or more embodiments of the present utility model, the checking circuit of the medium-low voltage transformer further includes a display screen, where the display screen is electrically connected with an output end of the transformer checking instrument and displays a measurement error, and the measurement error result can be intuitively and conveniently displayed directly through the display screen;
in summary, the utility model provides a checking circuit of a medium-low voltage current transformer, which has the following working principle: closing a knife switch QS1, obtaining an adjusted input voltage by a current rising circuit through a voltage regulator, and outputting current, and lighting a zero lamp X1, wherein:
in a natural state, the emergency stop button B1 and the zero position switch Sz are in a closed state, and the normally open contact KA2 of the relay KA2 1 Closed, normally closed contact KA2 2 The coil of the relay KA2 is electrified after being disconnected; normally open contact KA2 of relay KA2 1 After closing, at this time, as long as the knife switch QS1 and the emergency stop button B1 are not opened, the normally open contact of the relay KA1 is in a closed state, and the coil of the relay KA1 is electrified;
when the voltage regulator is not in the zero position, the zero position switch Sz is turned off, the coil of the relay KA2 is in power failure, the zero position lamp X1 is extinguished, and the normally open contact KA2 of the relay KA2 1 Open, normally closed contact KA2 2 Closing, at this time, a knife switch QS1 in the switch control circuit, two normally open contacts of a relay KA1 and a normally closed contact KA2 of a relay KA2 2 The voltage regulator can output voltage to the current-rising circuit, the multi-winding transformer and the tested current transformer of the current-rising circuit can output tested large current signals and standard large current signals to the transformer calibrator through the wiring panel and the inspection transfer switch, the transformer calibrator can perform testing, and the testing result is output to the display screen for displaying.
Example two
The utility model provides a checking device for a medium-low voltage current transformer, which is a box body, wherein a medium-low voltage current transformer checking circuit is arranged in the box body, a display screen of the medium-low voltage current transformer checking circuit is arranged on the outer wall of the box body, wherein the outer wall of the box body is also provided with a control panel module, the control panel module is electrically connected with the medium-low voltage current transformer checking circuit and comprises five primary binding posts, two secondary binding posts, a gear button and a power supply adjusting handle, wherein the five primary binding posts are L, 10-25A, 30-75A, 100-250A and 300-600A respectively, and L is a public end L1 (or P1); the two secondary connection posts S1, S2; the gear button comprises a secondary load gear, a gear with current ratio and a checking gear of the checking instrument;
the test operation flow of the checking device of the medium-low voltage current transformer is as follows:
1. before the power-on use, the equipment grounding terminal is reliably grounded; in order to cut off the high voltage and ensure the safe insulation distance between the sample and the high voltage, the tested current transformer is ensured to be in a power-off state; removing the original primary and secondary wiring of the tested current transformer;
2. selecting a proper primary binding post on the control panel according to rated primary current of the tested current transformer, and selecting L and 300-600A binding posts if the tested current transformer is a 400A/5A current transformer;
3. connecting a public end on a control panel of the device with a primary end P1 of a tested current transformer, connecting a corresponding current terminal on the control panel of the device with a primary end P2 of the tested current transformer, and connecting a 300-600A terminal with the tested P2 if the tested current transformer is a 400A/5A current transformer;
4. connecting an S1 terminal on the control panel with a secondary terminal S1 of the tested current transformer, and connecting an S2 wiring terminal with a secondary terminal S2 of the tested current transformer;
5. selecting a corresponding secondary load gear on the control panel according to the rated load of the tested current transformer, wherein OVA indicates secondary short connection without load;
6. according to rated primary and secondary currents of the tested current transformer, selecting a current ratio gear on the control panel, wherein the checking gear of the checking instrument is only used for checking by the checking instrument and is not used for normal testing;
7. after the wire is connected according to the steps, selecting the load and current ratio, confirming whether the emergency stop switch is in a closed state, and if so, releasing clockwise rotation; connecting to 220V power supply and closing switch; closing a switch knife switch, confirming that a power supply adjusting handle is in a zero position, turning on a zero position indicator lamp, turning on a screen, entering a welcome page, automatically entering a setting interface after waiting for a few seconds, and finishing setting;
8. clicking a current transformer icon, entering a wiring diagram schematic interface, clicking a determining icon, and entering a test interface;
9. starting to rotate a power supply adjusting handle, monitoring the percentage change of 'I/In (%)' In a screen, and measuring errors at 1%, 5%, 20%, 100% and 120% rated current points respectively, wherein a mutual inductance calibrator can automatically record error data of a plurality of points; after testing the 120% in error, the handle rotates anticlockwise to return to zero, so that after the zero lamp is lightened, the secondary load is switched to be the light load, and the operation is repeated to perform error check in the light load state;
10. after the light load error measurement is completed, the power supply returns to zero, at the moment, the tested data are replaced on the screen, a save button on a page is clicked, and the tested data are saved in the internal storage space of the mutual inductance calibrator, so that the data are conveniently retrieved and exported;
11. after the whole test is finished, the power supply handle returns to zero, the knife switch is turned off, the power switch is turned off, and the power plug is pulled out; and sequentially removing the primary current lead and the secondary current lead, recovering the tested current transformer to an initial state, and completing the test.
Claims (8)
1. The utility model provides a well low-voltage current transformer check-up circuit, its characterized in that, well low-voltage current transformer check-up circuit includes switch control circuit, voltage regulator, current-rising circuit, censor transfer switch and mutual-inductor check gauge, wherein:
the input end of the switch control circuit is electrically connected with an external power supply, the output end of the switch control circuit is electrically connected with a voltage regulator, and the switch control circuit is used for controlling the on-off of the whole main loop and providing input voltage, wherein the voltage regulator is used for regulating the input voltage;
the input end of the current rising circuit is electrically connected with the voltage regulator, and the output end of the current rising circuit is electrically connected with the sending and detecting change-over switch and is used for outputting a standard heavy current signal and a tested heavy current signal;
the censor transfer switch is electrically connected with the transformer calibrator and is used for transmitting the standard heavy current signal and the tested heavy current signal to the transformer calibrator for testing to obtain a measurement error.
2. The medium-low voltage current transformer verification circuit of claim 1, wherein the switch control circuit comprises a knife switch QS1, an emergency stop button B1, a zero switch Sz, a zero lamp X1, a relay KA1 and a relay KA2, wherein:
the two input ends of the knife switch QS1 are respectively and electrically connected with a zero line and a fire wire of an external 220V power supply, and an emergency stop button B1, a zero position switch Sz and a zero position lamp X1 are sequentially connected in series between the positive output end and the negative output end of the knife switch; the positive output end of the disconnecting link switch QS1 passes through a normally open contact KA1 of a relay KA1 1 The negative output end is electrically connected with the negative input end of the voltage regulator;
one end of a coil of the relay KA1 is electrically connected with the negative output end of the disconnecting link switch QS1, and the other end of the coil passes through the normally open contact KA1 2 Is electrically connected with the emergency stop button B1;
the two ends of the coil of the relay KA2 are connected with the two ends of the zero lamp X1 in parallel, and the normally open contact KA2 1 Normally open contact KA1 with relay KA1 2 Parallel normally closed contact KA2 2 Is electrically connected with the positive input end of the up-current circuit.
3. The checking circuit of a medium-low voltage current transformer according to claim 2, wherein the positive output end of the voltage regulator passes through a normally closed contact KA2 of a relay KA2 2 The negative output end is electrically connected with the negative input end of the current-rising circuit.
4. The medium-low voltage current transformer verification circuit of claim 1, wherein the censoring transfer switch comprises two differential current signal inputs and two reference current signal inputs.
5. The medium-low voltage current transformer verification circuit of claim 2, wherein the current boost circuit comprises a multi-winding transformer and a current transformer under test, wherein:
the multi-winding transformer comprises a first primary winding, a second primary winding and a secondary winding which are provided with two end binding posts, wherein the second primary winding and the secondary winding also comprise a plurality of center tap binding posts, and the tested current transformer comprises a primary winding and a secondary winding;
the positive input end of the first primary winding is in contact with a normally closed contact KA2 of a relay KA2 2 The negative input end is electrically connected with the negative output end of the voltage regulator;
the two ends of the primary winding of the tested current transformer are electrically connected with any one of two end binding posts and a plurality of center tap binding posts of the secondary winding of the multi-winding transformer; one end of a secondary winding of the tested current transformer is electrically connected with one end binding post of a second primary winding of the multi-winding transformer, and the other end of the secondary winding of the tested current transformer is electrically connected with one reference current signal end of the censor through a current load Ri;
one end of the second primary winding of the multi-winding transformer, which is electrically connected with the secondary winding of the tested current transformer, is also electrically connected with the differential current signal input end of the censor change-over switch, and the other end binding post and any binding post of the plurality of center tap binding posts are electrically connected with the censor change-over reference current signal end.
6. The medium-low voltage current transformer verification circuit of claim 5, further comprising a wiring panel having first differential current signal terminals, second differential current signal terminals, first reference current signal terminals, and second reference current signal terminals disposed thereon, wherein:
the first differential current signal binding post is used for connecting a second primary winding of the multi-winding transformer with one differential current signal input end of the censoring change-over switch;
the second differential current signal binding post is electrically connected with the other differential current signal input end of the censoring change-over switch;
the first reference current signal binding post is electrically connected with one reference current signal input end of the censoring change-over switch;
the second reference current signal binding post is electrically connected with the other reference current signal input end of the inspection transfer switch.
7. The medium-low voltage current transformer verification circuit of claim 1, further comprising a display screen electrically connected to an output of the transformer verification instrument for displaying measurement errors.
8. The device is characterized in that a middle-low voltage current transformer verification circuit is arranged in the device, and a display screen of the middle-low voltage current transformer verification circuit is arranged on the outer wall of the device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223121780.4U CN219065722U (en) | 2022-11-23 | 2022-11-23 | Checking circuit and device for medium-low voltage current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223121780.4U CN219065722U (en) | 2022-11-23 | 2022-11-23 | Checking circuit and device for medium-low voltage current transformer |
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| Publication Number | Publication Date |
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| CN219065722U true CN219065722U (en) | 2023-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223121780.4U Active CN219065722U (en) | 2022-11-23 | 2022-11-23 | Checking circuit and device for medium-low voltage current transformer |
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| Country | Link |
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| CN (1) | CN219065722U (en) |
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