CN211577408U - Portable CT secondary side open circuit testing arrangement - Google Patents
Portable CT secondary side open circuit testing arrangement Download PDFInfo
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- CN211577408U CN211577408U CN201922152545.5U CN201922152545U CN211577408U CN 211577408 U CN211577408 U CN 211577408U CN 201922152545 U CN201922152545 U CN 201922152545U CN 211577408 U CN211577408 U CN 211577408U
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Abstract
The utility model relates to a CT tests technical field, especially relates to a portable CT secondary side testing arrangement that opens a way, which comprises a housin, the casing embeds there is control module, exchanges output module, voltage acquisition module, the surface of casing is equipped with human-computer interaction module and display screen, exchange output module, voltage acquisition module, human-computer interaction module, display screen all with the control module electricity is connected, the casing still is equipped with the terminal outward, the terminal all with exchange output module, voltage acquisition module and connect, this testing arrangement still is equipped with the test wire, the one end of test wire with terminal connection, the other end and CT secondary side loop connection. The testing device can carry out open circuit testing on the secondary side loop of the CT under the condition of not cutting out a current connecting sheet, and has the advantages of portability, easiness in operation, short testing time and the like.
Description
Technical Field
The utility model relates to a CT tests technical field, especially relates to a portable CT secondary side testing arrangement that opens a way.
Background
The CT (current transformer) is mainly used for converting large current in an alternating current circuit into corresponding small current according to a certain proportion for measurement and relay protection. In operation, if the secondary side loop is open-circuited, the primary side current becomes the exciting current, which makes the magnetic flux in the iron core sharp, the iron core heats seriously to burn the coil insulation, or the high-voltage side is short-circuited to the ground; the open circuit of the secondary coil can induce very high voltage, which can cause the burning of instruments and serious personal casualty accidents, therefore, the open circuit of the secondary side of the CT in operation is strictly forbidden.
In the actual engineering, when engineering construction such as CT replacement and protection technology improvement is performed, a CT secondary circuit usually needs to be modified, and a plurality of devices are often connected in series to the CT secondary circuit, so that the CT secondary circuit has a plurality of disconnection points. The method comprises the steps of cutting a source side current connecting sheet after operation is finished, measuring the direct resistance of a secondary circuit by using a universal meter, judging whether the secondary circuit is intact or not, cutting the current connecting sheet while judging whether a CT secondary circuit is open or not, artificially creating a new open circuit point, increasing the risk of opening the CT secondary circuit, and meanwhile, the method is complex in operation and time-consuming, and cannot carry out open circuit test again before power transmission, so that certain risk exists.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a portable CT secondary side testing arrangement that opens a way can open a way the test to CT secondary side return circuit under the condition of not drawing open current connection piece, has advantages such as portable, easy operation, test weak point consuming time.
The technical scheme of the utility model is that:
the utility model provides a portable CT secondary side testing arrangement that opens a way, includes the casing, the casing embeds there is control module, exchanges output module, voltage acquisition module, the surface of casing is equipped with human-computer interaction module and display screen, exchange output module, voltage acquisition module, human-computer interaction module, display screen all with the control module electricity is connected, the casing still is equipped with the terminal outward, the terminal all with exchange output module, voltage acquisition module and connect, this testing arrangement still is equipped with the test wire, the one end of test wire with terminal connection, the other end and CT secondary side loop connection.
Through man-machine interaction module output control instruction, exchange output module output alternating current by control module control, the alternating current flows through the test wire that the terminal was pegged graft, the other end of test wire is pegged graft and is exported the alternating current at the wiring port in CT secondary side return circuit, simultaneously through the voltage data that voltage acquisition module passes through the voltage of test wire acquisition CT secondary side return circuit and transmit control module, through the voltage data who gathers, control module judges whether there is the impedance in CT secondary side return circuit: if the CT secondary side loop is in a normal condition, the impedance is zero, and if the CT secondary side loop is in an open circuit condition, a larger impedance value exists; and finally, the control module outputs the judgment result to a display screen for displaying, so that an operator can intuitively and simply judge whether the secondary circuit is open or not, and the operation safety is improved.
Furthermore, the man-machine interaction module is provided with a plurality of keys, and the keys are used for outputting man-machine interaction commands.
Furthermore, a lithium battery is arranged in the testing device and serves as a power supply, and the lithium battery supplies power for a control module, an alternating current output module, a voltage acquisition module, a man-machine interaction module and a display screen in the testing device.
Furthermore, a power supply hole for charging the lithium battery is formed outside the shell.
Further, the power hole adopts a Type-C interface.
Further, the voltage for charging the lithium battery through the power supply hole is 5V-DC.
Further, the control module adopts an LPC1768 microcontroller.
Further, the alternating current output module adopts MOLEX connectors CFP 7551-1850F.
Further, the voltage acquisition module adopts a DAM-6084 voltage acquisition module.
Furthermore, the shell is made of an insulating material, so that the safety of the shell is improved.
The utility model has the advantages that:
the utility model discloses a portable CT secondary side testing arrangement that opens a way mainly comprises device body and test wire, has set up human-computer interaction module, display screen and terminal on the device body for the output of parameter setting, state look over and experimental volume is pegged graft through the test wire and is tested on the wiring port in CT secondary side return circuit, and the test procedure need not carve out the current connection piece, reduces secondary CT return circuit risk of opening a way, and the test procedure is simple, convenient operation.
Drawings
FIG. 1 is a block diagram of the device control logic of the present invention;
fig. 2 is an overall schematic view of the present invention;
FIG. 3 is a schematic illustration of a test line;
FIG. 4 is a schematic diagram of a secondary side circuit of the CT;
FIG. 5 is an equivalent circuit diagram of FIG. 4;
in the figure: the device comprises a shell 1, a human-computer interaction module 2, a display screen 3 and a test line 4.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
Example 1:
as shown in fig. 1-3, a portable CT secondary side open circuit testing device comprises a casing 1, a control module, an alternating current output module and a voltage acquisition module are arranged in the casing 1, a human-computer interaction module 2 and a display screen 3 are arranged on the surface of the casing 1, the human-computer interaction module 2 is provided with a plurality of keys, the alternating current output module, the voltage acquisition module, the human-computer interaction module 2 and the display screen 3 are all electrically connected with the control module, a lithium battery is arranged in the testing device and used as a power supply, the lithium battery supplies power for the control module, the alternating current output module, the voltage acquisition module, the human-computer interaction module 2 and the display screen 3 in the device, a binding post is also arranged outside the casing 1, and the binding post is all connected, the testing device is also provided with a test wire 4, one end of the test wire 4 is connected with the wiring terminal, and the other end of the test wire 4 is connected with a secondary side loop of the CT.
In this embodiment, casing 1 is equipped with the power hole that is used for charging for the lithium cell outward, and the power hole adopts Type-C interface, and the voltage that charges to the lithium cell through the power hole is 5V-DC.
In this embodiment, the control module adopts an ARM LPC1768 microcontroller based on a 32-bit core, the operating frequency of which can reach 100MHZ, and adopts a 3-stage pipeline and a huff structure, and external components thereof include a Flash memory up to 512KB, a data storage of 64KB, rich communication short spaces, an ultra-low power consumption RTC with independent battery power supply, and up to 70 general I/O pins;
the alternating current output module adopts MOLEX connectors CFP7551-1850F, the output current is large (can reach 2-4A), alternating current and direct current loads can be carried, and the adaptability is strong;
the voltage acquisition module adopts DAM-6084, is a mixed data acquisition device integrating analog quantity input and digital quantity input, and can acquire 8 paths of single-end analog signals and 4 paths of digital quantity signals; the voltage acquisition module adopts a high-performance 12-bit AD chip, the acquisition and measurement precision is better than +/-0.2% through circuit processing and a special software algorithm, and the advanced magnetic isolation technology is adopted, so that the speed, reliability and safety of data acquisition are effectively guaranteed.
In this embodiment, the housing 1 is made of an insulating material, so that the safety of the housing is improved.
In this embodiment, the control module controls the ac output module to output ac power, processes data of the voltage acquisition module, displays the data through the display screen 3, and receives key commands of the human-computer interaction module 2, and the specific circuit connections are well known to those skilled in the art, and will not be described herein.
The utility model discloses a theory of operation does:
the CT is a special step-up transformer, the number of turns of a primary side winding is small, the number of turns of a secondary side winding is large, when the secondary side is connected in series with a protection and measurement device for use, the secondary load impedance is small, and under the normal use condition, a secondary loop of the CT is close to a short-circuit state. The schematic diagram of the secondary side circuit of the CT is shown in fig. 4, wherein the first, the second, the third and the fourth are wiring ports, the wiring ports comprise three-phase wiring ports, one grounding port, Z1 is secondary side impedance of the CT, mainly inductive reactance of a secondary winding of the CT, and is in direct proportion to the number of turns n of the secondary winding of the CT and the frequency f of alternating current flowing through the secondary winding of the CT; z2 is the load-side impedance of the CT secondary loop, which is almost zero. The circuit in fig. 4 is equivalent to the circuit in fig. 5, when the first and the second terminals are taken as input ports, the impedance is Z1// Z2, and a high-frequency alternating-current signal is input to the first and the second terminals, if a secondary side loop of the CT is in a normal condition, because Z1 is far greater than Z2, Z2 can be approximately equal to 0 at this time; if the secondary side loop of the CT is in an open circuit condition, there may be Z1, which has a larger impedance value; therefore, whether the secondary side loop of the CT is open can be judged by measuring the Z.
In the embodiment, the binding posts comprise three-phase binding posts A, B, C and a grounding post N, when a single-phase circuit test is carried out, one test wire 4 is plugged on one of the three-phase binding posts, the other end of the test wire is plugged on a same-phase wiring port of a CT secondary side loop, meanwhile, the other test wire 4 is plugged on the grounding post N, and the other end of the test wire is plugged on a grounding port of the CT secondary side loop, so that the test can be carried out; similarly, when the three-phase circuit test is carried out, the three-phase wiring terminals are respectively inserted with the test wires 4, and the other ends of the three test wires 4 are respectively inserted on the corresponding three-phase wiring ports of the secondary side loop of the CT.
The utility model discloses a 2 output control instructions of human-computer interaction module, exchange output module output alternating current by control module control, the alternating current flows out through test line 4 that the terminal was pegged graft, the other end of test line 4 is pegged graft and is exported the alternating current at the wiring port in CT secondary side return circuit, pass through the voltage acquisition module simultaneously and gather the voltage in CT secondary side return circuit and transmit control module through test line 4, through the voltage data who gathers, control module judges whether there is the impedance in CT secondary side return circuit: if the CT secondary side loop is in a normal condition, the impedance is zero, and if the CT secondary side loop is in an open circuit condition, a larger impedance value exists; and finally, the control module outputs the judgment result to the display screen 3 for displaying, so that an operator can intuitively and simply judge whether the secondary circuit is open or not, and the operation safety is improved.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not limitations to the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a portable CT secondary side testing arrangement that opens a way, a serial communication port, which comprises a housin, the casing embeds there is control module, exchanges output module, voltage acquisition module, the surface of casing is equipped with human-computer interaction module and display screen, exchange output module, voltage acquisition module, human-computer interaction module, display screen all with the control module electricity is connected, the casing still is equipped with the terminal outward, the terminal all with exchange output module, voltage acquisition module and connect, this testing arrangement still is equipped with the test wire, the one end of test wire with terminal connection, the other end and CT secondary side return circuit connection.
2. The portable CT secondary side open circuit testing device as recited in claim 1, wherein the human-computer interaction module is provided with a plurality of keys.
3. The portable CT secondary side open circuit testing device as recited in claim 1, wherein a lithium battery is configured inside the testing device as a power supply, and the lithium battery supplies power to a control module, an alternating current output module, a voltage acquisition module, a human-computer interaction module and a display screen in the device.
4. The portable CT secondary side open circuit testing device as recited in claim 3, wherein the housing is provided with a power hole for charging the lithium battery.
5. The portable CT secondary side open circuit testing device of claim 4, wherein the power hole adopts a Type-C interface.
6. The portable CT secondary side open circuit testing device as recited in claim 4, wherein the voltage for charging the lithium battery through the power hole is 5V-DC.
7. The portable CT secondary side open circuit testing device of claim 1 wherein the control module employs an LPC1768 microcontroller.
8. The portable CT secondary side open circuit testing device as claimed in claim 1, wherein the AC output module employs MOLEX connectors CFP 7551-1850F.
9. The device of claim 1, wherein the voltage acquisition module is a DAM-6084 voltage acquisition module.
10. The portable CT secondary side open circuit testing device of claim 1, wherein the housing is made of an insulating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922152545.5U CN211577408U (en) | 2019-12-04 | 2019-12-04 | Portable CT secondary side open circuit testing arrangement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922152545.5U CN211577408U (en) | 2019-12-04 | 2019-12-04 | Portable CT secondary side open circuit testing arrangement |
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| CN211577408U true CN211577408U (en) | 2020-09-25 |
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| CN201922152545.5U Active CN211577408U (en) | 2019-12-04 | 2019-12-04 | Portable CT secondary side open circuit testing arrangement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112462303A (en) * | 2021-01-28 | 2021-03-09 | 浙江艾罗网络能源技术股份有限公司 | Connection identification detection method of power grid current sensor |
| CN113325338A (en) * | 2021-04-07 | 2021-08-31 | 国网浙江省电力有限公司金华供电公司 | Portable transformer substation CT secondary load test device |
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2019
- 2019-12-04 CN CN201922152545.5U patent/CN211577408U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112462303A (en) * | 2021-01-28 | 2021-03-09 | 浙江艾罗网络能源技术股份有限公司 | Connection identification detection method of power grid current sensor |
| CN112462303B (en) * | 2021-01-28 | 2021-05-04 | 浙江艾罗网络能源技术股份有限公司 | Connection identification detection method of power grid current sensor |
| CN113325338A (en) * | 2021-04-07 | 2021-08-31 | 国网浙江省电力有限公司金华供电公司 | Portable transformer substation CT secondary load test device |
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