Automatic detection device for insulation early warning lamp of dry-type current transformer

Abstract

The invention provides an automatic detection device for an insulation early warning lamp of a dry-type current transformer. The automatic detection device comprises a direct-current signal source, a signal inverter, a single-pole double-throw relay, a signal conditioning module, a terminal detection module, a man-machine interaction module and a control processing module, the control processing module generates a corresponding test instruction according to user input information, sends the test instruction to the signal conditioning module, and converts the test instruction into a control instruction of the single-pole double-throw relay and a detection instruction of the terminal detection module. The single-pole double-throw relay realizes that the direct current signal source outputs a direct current signal or the signal inverter outputs an alternating current signal to the terminal detection module based on the control instruction, and further the terminal detection module detects the to-be-detected insulation early warning lamp and an early warning loop when the to-be-detected insulation early warning lamp is connected with the CT in combination with the detection instruction. And the signal conditioning module feeds back to the control processing module to realize automatic test result judgment. According to the invention, the insulation early warning lamp and the early warning loop when the insulation early warning lamp is connected with the CT can be accurately detected without dismounting any part.

Description

Technical Field

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

[0002] The insulation warning light is installed on the dry-type current transformer (CT) body and is used for real-time online monitoring of the main insulation of the CT.

[0003] like Figure 1 and Figure 2 As shown, three screw terminals X, Y, and E are provided in the CT secondary outlet terminal box. The lead wire of the CT voltage divider screen (end of the C1 screen) is connected to the inner part of the terminal Y box, and the lead wire of the CT end screen (end of the C2 screen) is connected to the inner part of the terminal E box. At the same time, one end of the input signal line of the insulation warning light is connected to the inner part of the X terminal box, and the other end of the input signal line is connected to the shell (ground). In addition, an L-shaped connecting piece is used to connect the outer part of the terminal X and Y box. Among them, the L-shaped connecting piece is provided with three screw-type terminals, which are crimped on the terminals X, Y, and E through nuts.

[0004] Until now, the traditional insulation warning detection device has been used to detect the insulation warning light. It is necessary to first remove the insulation warning light from the CT body and then plug it into the detection device. However, this method only detects the insulation warning light body and ignores the detection of the connection circuit between the CT and the insulation warning light. Therefore, there is a problem of incomplete detection of the insulation warning light circuit. In addition, the L-shaped connecting piece needs to be disassembled and installed during CT maintenance or testing. Once the L-shaped connecting piece is not installed or the connection is unreliable after the test, the insulation warning light installed again after the test will fail to warn (for example, the LED light will not flash).

[0005] Therefore, there is an urgent need for a new insulation warning detection device, which does not require the insulation warning light to be removed from the CT body, nor does it require the L-shaped connecting piece to be removed, so that the insulation warning light and the warning circuit when it is connected to the CT can be easily and accurately detected. 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-type current transformer, which can accurately detect the insulation warning light and the warning circuit when it is connected to the CT without disassembling any components.

[0007] In order to solve the above technical problems, an embodiment of the present invention provides an automatic detection device for an insulation warning light of 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-computer interaction module and a control processing module; wherein,

[0008] The voltage control end of the single-pole double-throw relay is connected to the first end of the signal conditioning module, the normally closed end is connected to the DC signal source, the normally open end is connected to the DC signal source via the signal inverter, and the common end is connected to the terminal detection module, and is used to connect the normally closed end with the common end according to the control instruction issued by the signal conditioning module, so that the DC signal source outputs a DC signal to the terminal detection module; or connect the normally open end with the common end, so that the DC signal source inverts and outputs an AC signal to the terminal detection module through the signal inverter;

[0009] The second end of the signal conditioning module is connected to the first end of the control processing module, and the third end is connected to the terminal detection module, and is used to convert the test instruction issued by the control processing module into a control instruction issued to the single-pole double-throw relay and a detection instruction issued to the terminal detection module; and feed back the signal detected by the terminal detection module based on the detection instruction 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 ground terminal and an LED terminal, wherein the voltage loading terminal is connected to the common terminal of the single-pole double-throw relay, the signal acquisition terminal is connected to the second terminal of the signal conditioning module, the E terminal, the Y terminal and the X terminal are respectively used to connect the terminal E, the terminal Y and the terminal X on the secondary junction box of the CT connected to the insulation warning light to be tested, the ground terminal is a terminal for connecting the ground wire of the insulation warning light to be tested, and the LED terminal is a terminal for connecting the insulation warning light to be tested; the terminal detection module is used to detect the insulation warning light to be tested and the warning circuit when it is connected to the CT according to the detection instruction forwarded by the signal conditioning module, combined with the connection status between the insulation warning light to be tested and the signal output by the single-pole double-throw relay controlled by the signal conditioning module, including the correctness detection of the insulation warning light to be tested, and the connectivity detection between the terminal E and the ground when the insulation warning light to be tested is connected to the CT, and the connectivity detection between the terminal Y and the terminal X;

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

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

[0013] The first detection instruction is used to instruct the connectivity detection between the terminal E and the ground when the insulation warning lamp to be tested is connected to the CT;

[0014] The second detection instruction is used to instruct the connectivity detection between terminal Y and terminal X when the insulation warning lamp to be tested is connected to the CT;

[0015] The third detection instruction is used to instruct the correctness detection of the insulation warning light to be tested.

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

[0017] Among them, the E end of the terminal detection module is connected to the terminal E on the secondary junction box of the CT connected to the insulation warning light to be tested, and the grounding end is connected to the grounding wire of the insulation warning light to be tested.

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

[0019] Among them, the Y end of the terminal detection module is connected to the terminal Y on the secondary junction box of the CT connected to the insulation warning light to be tested, and the X end is connected to the terminal X on the secondary junction box of the CT connected to the insulation warning light to be tested.

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

[0021] Among them, the X end of the terminal detection module is connected to the terminal X on the secondary junction box of the CT connected to the insulation warning light to be tested, and its LED end collects the state of the insulation warning light to be tested through a preset color sensor.

[0022] The signal conditioning module includes a signal conditioning chip and a relay driving circuit, a signal filtering and amplifying circuit connected thereto.

[0023] Wherein, the terminal detection module includes a chip selection chip and its connected peripheral circuits.

[0024] Wherein, the human-computer interaction module includes buttons and a liquid crystal screen with a display function.

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

[0026] The present invention receives information input by the user on the human-computer interaction module through the control processing module, generates corresponding test instructions to the signal conditioning module, and converts them into control instructions of the single-pole double-throw relay and detection instructions of the terminal detection module, so that the single-pole double-throw relay realizes the output of a DC signal source or outputs an AC signal to the terminal detection module through the signal inverter based on the control instructions, and further allows the terminal detection module to detect the insulation warning lamp to be tested and the warning circuit when it is connected to the CT in combination with the detection instructions, and then the signal conditioning module feeds back to the control processing module to realize automatic test result judgment, so that the insulation warning lamp and the warning circuit when it is connected to the CT can be accurately detected without disassembling any components. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0028] Figure 1 A simplified diagram of the logic connection between a dry-type current transformer and an insulation warning light in the prior art;

[0029] Figure 2 It is a partial bottom view of the secondary outlet terminal box of the current transformer in the prior art when the L-shaped connecting piece is installed;

[0030] Figure 3 The present invention is a schematic structural diagram 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 DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clear, 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 insulation warning light of dry-type current transformer is proposed in an embodiment of the present invention, comprising 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-computer 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, the normally closed terminal NC is connected to the DC signal source 1, the normally open terminal NO is connected to the DC signal source 1 via the signal inverter 2, and the common terminal COM is connected to the terminal detection module 5, and is used to connect the normally closed terminal NC with the common terminal COM according to the control instruction 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 connect the normally open terminal NO with the common terminal COM, so that the DC signal source 1 inverts and outputs an AC signal to the terminal detection module 5 through the signal inverter 2;

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

[0035] The 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. The 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, and the E terminal c3, the Y terminal c4 and the X terminal c5 are respectively used to connect the terminals E, Y and X on the secondary junction box of the CT connected to the insulation warning lamp to be tested (see Figure 2 As shown), the ground terminal c6 is a terminal for connecting the ground wire of the insulation warning light to be tested, and the LED terminal c7 is a terminal for connecting the insulation warning light to be tested; the terminal detection module 5 is used to detect the insulation warning light to be tested and the warning circuit when it is connected to the CT according to the detection instruction forwarded by the signal conditioning module 4, combined with the connection between the insulation warning light to be tested 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 light to be tested, and the connectivity detection between the terminal E and the ground when the insulation warning light to be tested is connected to the CT, and the connectivity detection between the terminal Y and the terminal X; wherein the terminal detection module 5 includes a chip selection chip and its connected peripheral circuit;

[0036] The human-computer interaction module 6 includes buttons and a liquid crystal screen with display function, so it has button control and display functions;

[0037] The second end b2 of the control processing module 7 is connected to the human-computer interaction module 6, and is used to generate corresponding test instructions based on the information input by the user; and, according to the feedback signal of the terminal detection module 5 forwarded by the signal conditioning module 4, the validity of the test results of the insulation warning lamp to be tested and the warning circuit when it is connected to the CT is judged. Among them, the detection instruction includes a first detection instruction, a second detection instruction and a third detection instruction; the first detection instruction is used to indicate the connectivity detection between the terminal E and the ground when the insulation warning lamp to be tested is connected to the CT; the second detection instruction is used to indicate the connectivity detection between the terminal Y and the terminal X when the insulation warning lamp to be tested is connected to the CT; the third detection instruction is used to indicate the correctness detection of the insulation warning lamp to be tested.

[0038] It should be noted that if the detection instruction is the first detection instruction, 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; or, the normally open terminal NO of the single-pole double-throw relay 3 is connected to the common terminal COM, so that the DC signal source 1 inverter outputs 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 terminal E on the secondary junction box of the CT connected to the insulation warning light to be tested, and the ground terminal c6 is connected to the ground wire of the insulation warning light to be tested.

[0039] If the detection instruction is the second detection instruction, 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 on the secondary junction box of the CT connected to the insulation warning light to be tested, and the X terminal c5 is connected to the terminal X on the secondary junction box of the CT connected to the insulation warning light to be tested.

[0040] If the detection instruction is the third detection instruction, the normally open terminal NO of the single-pole double-throw relay 3 is connected to the common terminal COM, so that the DC signal source 1 can invert and output an AC signal 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 light to be tested, and its LED terminal c7 is set close to the insulation warning light to be tested through a preset color sensor to collect the status of the insulation warning light to be tested.

[0041] The working principle of an automatic detection device for an insulation warning light of a dry current transformer in an embodiment of the present invention is as follows: first, the E end, Y end and X end of the terminal detection module 5 on the device are respectively connected to the terminal E, terminal Y and terminal X end on the secondary junction box of the CT to which the insulation warning light to be tested is connected, and at the same time, the LED end is connected to the end cover of the insulation warning light to be tested through a color sensor, and the ground end is connected to the ground wire of the secondary junction box of the insulation warning light to be tested or the CT to which it is connected; secondly, the device is started to enter a fully automatic measurement state; then, the user inputs relevant information on the human-computer interaction module 6 of the device, and the control processing module 7 of the device detects through the signal conditioning circuit 4 and the terminal detection module 5: 1. Whether E and G (i.e., the grounding end) are connected; 2. A DC signal is injected into the X end to detect whether the terminal X and the terminal Y are connected; 3. An AC signal is injected into the X end to detect the lighting state of the insulation warning light to be tested.

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

[0043] The present invention receives information input by the user on the human-computer interaction module through the control processing module, generates corresponding test instructions to the signal conditioning module, and converts them into control instructions of the single-pole double-throw relay and detection instructions of the terminal detection module, so that the single-pole double-throw relay realizes the output of a DC signal source or outputs an AC signal to the terminal detection module through the signal inverter based on the control instructions, and further allows the terminal detection module to detect the insulation warning lamp to be tested and the warning circuit when it is connected to the CT in combination with the detection instructions, and then the signal conditioning module feeds back to the control processing module to realize automatic test result judgment, so that the insulation warning lamp and the warning circuit when it is connected to the CT can be accurately detected without disassembling any components.

[0044] The above disclosure is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. An automatic detection device for insulation warning lights of dry-type current transformers, 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-computer interaction module and a control processing module; among which, The voltage control end of the single-pole double-throw relay is connected to the first end of the signal conditioning module, the normally closed end is connected to the DC signal source, the normally open end is connected to the DC signal source via the signal inverter, and the common end is connected to the terminal detection module, and is used to connect the normally closed end with the common end according to the control instruction issued by the signal conditioning module, so that the DC signal source outputs a DC signal to the terminal detection module; or connect the normally open end with the common end, so that the DC signal source inverts and outputs an AC signal to the terminal detection module through the signal inverter; The second end of the signal conditioning module is connected to the first end of the control processing module, and the third end is connected to the terminal detection module, and is used to convert the test instruction issued by the control processing module into a control instruction issued to the single-pole double-throw relay and a detection instruction issued to the terminal detection module; and feed back the signal detected by the terminal detection module based on the detection instruction 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 ground terminal and an LED terminal, wherein the voltage loading terminal is connected to the common terminal of the single-pole double-throw relay, the signal acquisition terminal is connected to the second terminal of the signal conditioning module, the E terminal, the Y terminal and the X terminal are respectively used to connect the terminal E, the terminal Y and the terminal X on the secondary junction box of the CT connected to the insulation warning light to be tested, the ground terminal is a terminal for connecting the ground wire of the insulation warning light to be tested, and the LED terminal is a terminal for connecting the insulation warning light to be tested; the terminal detection module is used to detect the insulation warning light to be tested and the warning circuit when it is connected to the CT according to the detection instruction forwarded by the signal conditioning module, combined with the connection between the insulation warning light to be tested and the signal output by the single-pole double-throw relay controlled by the signal conditioning module, including the correctness detection of the insulation warning light to be tested, and the connectivity detection between the terminal E and the ground when the insulation warning light to be tested is connected to the CT, and the connectivity detection between the terminal Y and the terminal X; The second end of the control processing module is connected to the human-computer interaction module, and is used to generate corresponding test instructions based on the information input by the user; and, according to the feedback signal of the terminal detection module forwarded by the signal conditioning module, the validity of the test results of the insulation warning lamp to be tested and the warning circuit when it is connected to the CT is judged.

2. The automatic detection device for the insulation warning light of a dry-type current transformer according to 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 instruction is used to instruct the connectivity detection between the terminal E and the ground when the insulation warning lamp to be tested is connected to the CT; The second detection instruction is used to instruct the connectivity detection between terminal Y and terminal X when the insulation warning lamp to be tested is connected to the CT; The third detection instruction is used to instruct the correctness detection of the insulation warning light to be tested.

3. The automatic detection device for the insulation warning light of a dry-type current transformer according to claim 2, characterized in that: If the detection instruction is the first detection instruction, the normally closed end of the single-pole double-throw relay is connected to the common end, so that the DC signal source outputs a DC signal to the terminal detection module; or, the normally open end of the single-pole double-throw relay is connected to the common end, so that the DC signal source inverts and outputs an AC signal to the terminal detection module; Among them, the E end of the terminal detection module is connected to the terminal E on the secondary junction box of the CT connected to the insulation warning light to be tested, and the grounding end is connected to the grounding wire of the insulation warning light to be tested.

4. The automatic detection device for the insulation warning light of a dry-type current transformer according to claim 2, characterized in that: If the detection instruction is the second detection instruction, the normally closed end of the single-pole double-throw relay is connected to the common end, so that the DC signal source outputs a DC signal to the terminal detection module; Among them, the Y end of the terminal detection module is connected to the terminal Y on the secondary junction box of the CT connected to the insulation warning light to be tested, and the X end is connected to the terminal X on the secondary junction box of the CT connected to the insulation warning light to be tested.

5. The automatic detection device for the insulation warning light of a dry-type current transformer according to claim 3, characterized in that: If the detection instruction is the third detection instruction, the normally open end of the single-pole double-throw relay is connected to the common end, so that the DC signal source is inverted to output an AC signal to the terminal detection module; Among them, the X end of the terminal detection module is connected to the terminal X on the secondary junction box of the CT connected to the insulation warning light to be tested, and its LED end collects the state of the insulation warning light to be tested through a preset color sensor.

6. The automatic detection device for the insulation warning light of a dry-type current transformer according to claim 1, characterized in that: The signal conditioning module includes a signal conditioning chip and a relay driving circuit connected thereto, and a signal filtering and amplifying circuit.

7. The automatic detection device for the insulation warning light of a dry-type current transformer according to claim 1, characterized in that: The terminal detection module includes a chip selection chip and a peripheral circuit connected thereto.

8. The automatic detection device for the insulation warning light of a dry-type current transformer according to claim 1, characterized in that: The human-computer interaction module includes buttons and a liquid crystal screen with a display function.

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