An automatic detection device for insulation warning lights of dry-type current transformers

Abstract

This invention provides an automatic detection device for insulation warning lights of dry-type current transformers, including a DC signal source, a signal inverter, a single-pole double-throw relay, a signal conditioning module, a terminal detection module, a human-machine interface module, and a control processing module. The control processing module generates corresponding test commands based on user input information and sends them to the signal conditioning module, which then converts them into control commands for the single-pole double-throw relay and detection commands for the terminal detection module. The single-pole double-throw relay, based on the control commands, outputs a DC signal from the DC signal source or an AC signal via the signal inverter to the terminal detection module. The terminal detection module then combines the detection commands with the insulation warning light under test and its warning circuit when connected to the current transformer (CT). The signal conditioning module then feeds back the results to the control processing module for automatic test result determination. Implementing this invention allows for accurate detection of insulation warning lights and their warning circuits when connected to the CT without disassembling any components.

Description

Technical Field

[0001] This invention relates to the field of power detection technology, and in particular to an automatic detection device for an insulation warning light of a dry-type current transformer. Background Technology

[0002] The insulation warning light is installed on the dry-type current transformer (CT) body to monitor the main insulation of the CT in real time.

[0003] like Figure 1 and Figure 2 As shown, the CT secondary output terminal box has three bolt terminals X, Y, and E. The lead wire from the CT's voltage divider panel (end of panel C1) is connected to the inner part of terminal box Y, and the lead wire from the CT's final panel (end of panel C2) is connected to the inner part of terminal box E. Simultaneously, one end of the input signal line for the insulation warning light is connected to the inner part of terminal box X, and the other end is connected to the outer casing (ground). Furthermore, an L-shaped connecting piece connects the outer parts of terminal boxes X and Y. The L-shaped connecting piece has three screw-hole terminals, which are pressed onto terminals X, Y, and E by nuts.

[0004] Traditionally, insulation warning lights have been tested using conventional insulation warning detection devices. This requires detaching the light from the CT (Cyclist Tester) and then connecting it to the device. However, this method only tests the light itself, neglecting the connection circuit between the CT and the light, resulting in incomplete circuit detection. Furthermore, CT maintenance and testing require disassembling and reassembling the L-shaped connecting piece. If the L-shaped connecting piece is not installed or is unreliable after testing, the reinstalled insulation warning light will fail to provide warnings (e.g., the LED light will not flash).

[0005] Therefore, there is an urgent need for a new insulation warning detection device that can conveniently and accurately detect the insulation warning light and its warning circuit when connected to the CT without removing the insulation warning light from the CT body or disassembling the L-shaped connecting piece. Summary of the Invention

[0006] The technical problem to be solved by the embodiments of the present invention is to provide an automatic detection device for the insulation warning light of a dry current transformer, which can accurately detect the insulation warning light and its warning circuit when connected to the CT without disassembling any parts.

[0007] To address the aforementioned technical problems, this invention provides an automatic detection device for an insulation warning light on a dry-type current transformer, comprising a DC signal source, a signal inverter, a single-pole double-throw relay, a signal conditioning module, a terminal detection module, a human-machine interface module, and a control processing module; wherein...

[0008] The voltage control terminal of the single-pole double-throw relay is connected to the first terminal of the signal conditioning module. Its normally closed terminal is connected to the DC signal source, its normally open terminal is connected to the DC signal source via the signal inverter, and its common terminal is connected to the terminal detection module. This relay is used to, according to control commands issued by the signal conditioning module, connect the normally closed terminal to the common terminal, enabling the DC signal source to output a DC signal to the terminal detection module; or connect the normally open terminal to the common terminal, enabling the DC signal source to output an AC signal via the signal inverter to the terminal detection module.

[0009] The second terminal of the signal conditioning module is connected to the first terminal of the control processing module, and the third terminal is connected to the terminal detection module. It is used to convert the test command issued by the control processing module into a control command issued to the single-pole double-throw relay and a detection command issued to the terminal detection module; and to feed back the signal detected by the terminal detection module based on the detection command to the control processing module.

[0010] The terminal detection module includes a voltage loading terminal, a signal acquisition terminal, an E terminal, a Y terminal, an X terminal, a grounding terminal, and an LED terminal. The voltage loading terminal is connected to the common terminal of the single-pole double-throw relay, and the signal acquisition terminal is connected to the second terminal of the signal conditioning module. The E, Y, and X terminals are respectively used to connect to terminals E, Y, and X on the secondary junction box of the CT connected to the insulation warning lamp under test. The grounding terminal is used to connect to the grounding wire of the insulation warning lamp under test, and the LED terminal is used to connect to the insulation warning lamp under test. The terminal detection module is used to detect the insulation warning lamp under test and its warning circuit when connected to the CT, based on the detection instructions forwarded by the signal conditioning module and in conjunction with the connection status with the insulation warning lamp under test and the signal output by the single-pole double-throw relay controlled by the signal conditioning module. This includes detecting the correctness of the insulation warning lamp under test, and detecting the connectivity between terminal E and ground, and the connectivity between terminal Y and terminal X when the insulation warning lamp under test is connected to the CT.

[0011] The second end of the control processing module is connected to the human-machine interaction module, and is used to generate corresponding test instructions based on the information input by the user; and to determine the validity of the test results of the insulation warning lamp under test and its warning circuit when connected to the CT according to the feedback signal forwarded by the signal conditioning module from the terminal detection module.

[0012] The detection instructions include a first detection instruction, a second detection instruction, and a third detection instruction; wherein,

[0013] The first detection command is used to indicate the continuity detection between terminal E and ground when the insulation warning lamp under test is connected to the CT;

[0014] The second detection command is used to indicate the connectivity detection between terminal Y and terminal X when the insulation warning lamp under test is connected to the CT;

[0015] The third detection command is used to indicate the correctness of the insulation warning light under test.

[0016] Wherein, if the detection command is the first detection command, the normally closed terminal of the single-pole double-throw relay is connected to the common terminal, so that the DC signal source outputs a DC signal to the terminal detection module; or, the normally open terminal of the single-pole double-throw relay is connected to the common terminal, so that the DC signal source inverts and outputs an AC signal to the terminal detection module.

[0017] The terminal E of the terminal detection module is connected to terminal E on the secondary junction box of the CT to which the insulation warning lamp under test is connected, and the grounding terminal is connected to the grounding wire of the insulation warning lamp under test.

[0018] Wherein, if the detection command is the second detection command, the normally closed terminal of the single-pole double-throw relay is connected to the common terminal, so that the DC signal source outputs a DC signal to the terminal detection module;

[0019] The Y terminal of the terminal detection module is connected to the secondary junction box of the CT connected to the insulation warning lamp under test, and the X terminal is connected to the secondary junction box of the CT connected to the insulation warning lamp under test.

[0020] Wherein, if the detection command is the third detection command, the normally open terminal of the single-pole double-throw relay is connected to the common terminal, so that the DC signal source inverter outputs an AC signal to the terminal detection module;

[0021] The X terminal of the terminal detection module is connected to the secondary junction box of the CT to which the insulation warning lamp under test is connected, and its LED terminal collects the status of the insulation warning lamp under test through a preset color sensor.

[0022] The signal conditioning module includes a signal conditioning chip and its connected relay drive circuit, signal filtering and amplification circuit.

[0023] The terminal detection module includes a chip select chip and its connected peripheral circuitry.

[0024] The human-computer interaction module includes buttons and an LCD screen with display function.

[0025] Implementing the embodiments of the present invention has the following beneficial effects:

[0026] This invention receives information input by the user on the human-machine interface module through a control processing module, generates corresponding test commands for the signal conditioning module, and converts them into control commands for a single-pole double-throw relay and detection commands for the terminal detection module. The single-pole double-throw relay, based on the control commands, outputs a DC signal from a DC signal source or an AC signal via a signal inverter to the terminal detection module. The terminal detection module then combines the detection commands with the test commands to detect the insulation warning lamp and its warning circuit connected to the CT. The signal conditioning module then feeds back the results to the control processing module for automatic test result judgment. Therefore, without disassembling any components, accurate detection of the insulation warning lamp and its warning circuit connected to the CT can be achieved. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0028] Figure 1 This is a simplified logic connection diagram between a dry-type current transformer and an insulation warning lamp in the prior art.

[0029] Figure 2 This is a partial bottom view of a current transformer secondary output terminal box with an L-shaped connecting piece installed in the prior art.

[0030] Figure 3 This is a schematic diagram of the structure of an automatic detection device for an insulation warning light of a dry-type current transformer provided in an embodiment of the present invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] like Figure 3 As shown in the figure, an automatic detection device for an insulation warning light of a dry-type current transformer, as proposed in an embodiment of the present invention, includes a DC signal source 1, a signal inverter 2, a single-pole double-throw relay 3, a signal conditioning module 4, a terminal detection module 5, a human-machine interaction module 6, and a control processing module 7 integrated on the same PCB circuit board; wherein,

[0033] The voltage control terminal K of the single-pole double-throw relay 3 is connected to the first terminal a1 of the signal conditioning module 4. Its normally closed terminal NC is connected to the DC signal source 1, and its normally open terminal NO is connected to the DC signal source 1 via the signal inverter 2. Its common terminal COM is connected to the terminal detection module 5. It is used to connect the normally closed terminal NC and the common terminal COM according to the control command issued by the signal conditioning module 4, so that the DC signal source 1 outputs a DC signal to the terminal detection module 5; or, to connect the normally open terminal NO and the common terminal COM, so that the DC signal source 1 outputs an AC signal via the signal inverter 2 to the terminal detection module 5.

[0034] The second terminal a2 of the signal conditioning module 4 is connected to the first terminal b1 of the control processing module 7, and the third terminal a3 is connected to the terminal detection module 5. It is used to convert the test command issued by the control processing module 7 into a control command to be issued to the single-pole double-throw relay 3 and a detection command to be issued to the terminal detection module 5; and to feed back the signal detected by the terminal detection module 5 based on the aforementioned detection command to the control processing module 7. The signal conditioning module 4 includes a signal conditioning chip and its connected relay driving circuit, signal filtering and amplification circuit.

[0035] Terminal detection module 5 includes a voltage loading terminal c1, a signal acquisition terminal c2, an E terminal c3, a Y terminal c4, an X terminal c5, a ground terminal c6, and an LED terminal c7. Its voltage loading terminal c1 is connected to the common terminal COM of the single-pole double-throw relay 3. The signal acquisition terminal c2 is connected to the second terminal a2 of the signal conditioning module 4. The E terminal c3, Y terminal c4, and X terminal c5 are the terminals E, Y, and X on the secondary junction box of the CT connected to the insulation warning lamp under test, respectively (see [link to relevant documentation]). Figure 2 As shown), grounding terminal c6 is the terminal used to connect the grounding wire of the insulation warning lamp under test, and LED terminal c7 is the terminal used to connect the insulation warning lamp under test; terminal detection module 5 is used to detect the insulation warning lamp under test and its warning circuit when connected to CT according to the detection command forwarded by signal conditioning module 4, combined with the connection status between the insulation warning lamp under test and the signal output by the single-pole double-throw relay 3 controlled by the signal conditioning module, including the correctness detection of the insulation warning lamp under test, and the connectivity detection between terminal E and ground, and the connectivity detection between terminal Y and terminal X when the insulation warning lamp under test is connected to CT; wherein, terminal detection module 5 includes a chip select chip and its connected peripheral circuit;

[0036] The human-computer interaction module 6 includes buttons and an LCD screen with display function, thus it has button control and display functions;

[0037] The second terminal b2 of the control processing module 7 is connected to the human-machine interaction module 6, and is used to generate corresponding test commands based on user input information; and to determine the validity of the test results of the insulation warning lamp under test and its warning circuit when connected to the CT, based on the feedback signal forwarded by the signal conditioning module 4 from the terminal detection module 5. The test commands include a first test command, a second test command, and a third test command; the first test command is used to indicate the continuity test between terminal E and ground when the insulation warning lamp under test is connected to the CT; the second test command is used to indicate the continuity test between terminal Y and terminal X when the insulation warning lamp under test is connected to the CT; and the third test command is used to indicate the correctness test of the insulation warning lamp under test.

[0038] It should be noted that if the detection command is the first detection command, the normally closed terminal NC of the single-pole double-throw relay 3 is connected to the common terminal COM, realizing the DC signal source 1 outputting a DC signal to the terminal detection module 5; or, the normally open terminal NO of the single-pole double-throw relay 3 is connected to the common terminal COM, realizing the DC signal source 1 inverter outputting an AC signal to the terminal detection module 5; at this time, the E terminal c3 of the terminal detection module 5 is connected to the secondary junction box terminal E of the CT connected to the insulation warning lamp under test, and the grounding terminal c6 is connected to the grounding wire of the insulation warning lamp under test.

[0039] If the detection command is the second detection command, the normally closed terminal NC of the single-pole double-throw relay 3 is connected to the common terminal COM, so that the DC signal source 1 outputs a DC signal to the terminal detection module 5. At this time, the Y terminal c4 of the terminal detection module 5 is connected to the terminal Y of the secondary junction box of the CT connected to the insulation warning lamp under test, and the X terminal c5 is connected to the terminal X of the secondary junction box of the CT connected to the insulation warning lamp under test.

[0040] If the detection command is the third detection command, the normally open terminal NO of the single-pole double-throw relay 3 is connected to the common terminal COM, realizing the inverter output of the DC signal source 1 to the terminal detection module 5; at this time, the X terminal c5 of the terminal detection module 5 is connected to the terminal X on the secondary junction box of the CT connected to the insulation warning lamp under test, and its LED terminal c7 collects the status of the insulation warning lamp under test by being close to the insulation warning lamp under test through a preset color sensor.

[0041] The working principle of the automatic detection device for the insulation warning lamp of a dry-type current transformer in this embodiment of the invention is as follows: First, the E, Y, and X terminals of the terminal detection module 5 of this device are connected to the terminals E, Y, and X terminals of the secondary junction box of the CT connected to the insulation warning lamp under test, respectively. At the same time, the LED terminal is connected to the end cover of the insulation warning lamp under test through a color sensor, and the grounding terminal is connected to the grounding wire of the insulation warning lamp under test or the secondary junction box of the CT connected to it. Second, the device is started, which enters the fully automatic measurement state. Then, the user inputs relevant information on the human-machine interaction module 6 of this device, so that the control processing module 7 of this device can detect the following through the signal conditioning circuit 4 and the terminal detection module 5: 1. Whether E and G (i.e., grounding terminals) are connected; 2. A DC signal is injected into the X terminal to detect whether terminals X and Y are connected; 3. An AC signal is injected into the X terminal to detect the lighting status of the insulation warning lamp under test.

[0042] Implementing the embodiments of the present invention has the following beneficial effects:

[0043] This invention receives information input by the user on the human-machine interface module through a control processing module, generates corresponding test commands for the signal conditioning module, and converts them into control commands for a single-pole double-throw relay and detection commands for the terminal detection module. The single-pole double-throw relay, based on the control commands, outputs a DC signal from a DC signal source or an AC signal via a signal inverter to the terminal detection module. The terminal detection module then combines the detection commands with the test commands to detect the insulation warning lamp and its warning circuit connected to the CT. The signal conditioning module then feeds back the results to the control processing module for automatic test result judgment. Therefore, without disassembling any components, accurate detection of the insulation warning lamp and its warning circuit connected to the CT can be achieved.

[0044] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. An automatic detection device for an insulation warning light of a dry-type current transformer, characterized in that, It includes a DC signal source, a signal inverter, a single-pole double-throw relay, a signal conditioning module, a terminal detection module, a human-machine interface module, and a control processing module; among which, The voltage control terminal of the single-pole double-throw relay is connected to the first terminal of the signal conditioning module. Its normally closed terminal is connected to the DC signal source, its normally open terminal is connected to the DC signal source via the signal inverter, and its common terminal is connected to the terminal detection module. This relay is used to, according to control commands issued by the signal conditioning module, connect the normally closed terminal to the common terminal, enabling the DC signal source to output a DC signal to the terminal detection module; or connect the normally open terminal to the common terminal, enabling the DC signal source to output an AC signal via the signal inverter to the terminal detection module. The second terminal of the signal conditioning module is connected to the first terminal of the control processing module, and the third terminal is connected to the terminal detection module. It is used to convert the test command issued by the control processing module into a control command issued to the single-pole double-throw relay and a detection command issued to the terminal detection module; and to feed back the signal detected by the terminal detection module based on the detection command to the control processing module. The terminal detection module includes a voltage loading terminal, a signal acquisition terminal, an E terminal, a Y terminal, an X terminal, a grounding terminal, and an LED terminal. The voltage loading terminal is connected to the common terminal of the single-pole double-throw relay, and the signal acquisition terminal is connected to the second terminal of the signal conditioning module. The E, Y, and X terminals are respectively used to connect to terminals E, Y, and X on the secondary junction box of the CT connected to the insulation warning lamp under test. The grounding terminal is used to connect to the grounding wire of the insulation warning lamp under test, and the LED terminal is used to connect to the insulation warning lamp under test. The terminal detection module is used to detect the insulation warning lamp under test and its warning circuit when connected to the CT, based on the detection command forwarded by the signal conditioning module, the connection status with the insulation warning lamp under test, and the signal output by the single-pole double-throw relay controlled by the signal conditioning module. This includes detecting the correctness of the insulation warning lamp under test, and detecting the connectivity between terminal E and ground, and the connectivity between terminal Y and terminal X when the insulation warning lamp under test is connected to the CT. The second end of the control processing module is connected to the human-machine interaction module, and is used to generate corresponding test instructions based on the information input by the user; and to determine the validity of the test results of the insulation warning lamp under test and its warning circuit when connected to the CT according to the feedback signal forwarded by the signal conditioning module from the terminal detection module.

2. The automatic detection device for the insulation warning light of the dry-type current transformer as described in claim 1, characterized in that, The detection instructions include a first detection instruction, a second detection instruction, and a third detection instruction; wherein, The first detection command is used to indicate the continuity detection between terminal E and ground when the insulation warning lamp under test is connected to the CT; The second detection command is used to indicate the connectivity detection between terminal Y and terminal X when the insulation warning lamp under test is connected to the CT; The third detection command is used to indicate the correctness of the insulation warning light under test.

3. The automatic detection device for the insulation warning light of the dry-type current transformer as described in claim 2, characterized in that, If the detection command is the first detection command, then the normally closed terminal of the single-pole double-throw relay is connected to the common terminal, so that the DC signal source outputs a DC signal to the terminal detection module; or, the normally open terminal of the single-pole double-throw relay is connected to the common terminal, so that the DC signal source inverts and outputs an AC signal to the terminal detection module. The terminal E of the terminal detection module is connected to terminal E on the secondary junction box of the CT to which the insulation warning lamp under test is connected, and the grounding terminal is connected to the grounding wire of the insulation warning lamp under test.

4. The automatic detection device for the insulation warning light of the dry-type current transformer as described in claim 2, characterized in that, If the detection command is the second detection command, then the normally closed terminal of the single-pole double-throw relay is connected to the common terminal, so that the DC signal source outputs a DC signal to the terminal detection module; The Y terminal of the terminal detection module is connected to the secondary junction box of the CT connected to the insulation warning lamp under test, and the X terminal is connected to the secondary junction box of the CT connected to the insulation warning lamp under test.

5. The automatic detection device for the insulation warning light of the dry-type current transformer as described in claim 3, characterized in that, If the detection command is the third detection command, then the normally open terminal of the single-pole double-throw relay is connected to the common terminal, so that the DC signal source inverter outputs an AC signal to the terminal detection module; The X terminal of the terminal detection module is connected to the secondary junction box of the CT to which the insulation warning lamp under test is connected, and its LED terminal collects the status of the insulation warning lamp under test through a preset color sensor.

6. The automatic detection device for the insulation warning light of a dry-type current transformer as described in claim 1, characterized in that, The signal conditioning module includes a signal conditioning chip and its connected relay drive circuit, signal filtering and amplification circuit.

7. The automatic detection device for the insulation warning light of a dry-type current transformer as described in claim 1, characterized in that, The terminal detection module includes a chip select chip and its connected peripheral circuitry.

8. The automatic detection device for the insulation warning light of a dry-type current transformer as described in claim 1, characterized in that, The human-computer interaction module includes buttons and an LCD screen with display function.

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