A CT polarity testing method for preventing height risks

Abstract

The present invention relates to the technical field of substation maintenance, specifically a method for testing CT polarity to prevent height hazards. The method includes a CT polarity tester, wherein a PCB control board within the CT polarity tester includes a touch display module, a controller, a charging circuit, a switch, a discharge circuit, an energy storage capacitor, a polarity detection circuit, and a mutual inductor. A P1 terminal, a P2 terminal, an S1 terminal, and an S2 terminal are sequentially provided on one side of the CT polarity tester from top to bottom. The CT polarity tester developed by the present invention can significantly reduce the volume and weight of the tester, facilitating on-site use and improving work efficiency. The method employs a current pulse signal less than 1A to test CY polarity. A pulse current signal is input to the P1 terminal of the CT, and S1 and S2 will generate a pulse current signal output with millisecond-level speed characteristics. The CT polarity is determined by analyzing these tandem current pulse signals.

Description

Technical Field

[0001] The present invention relates to the technical field of transformer substation maintenance, and in particular to a CT polarity testing method for preventing height-risk. Background Art

[0002] During substation CT maintenance, polarity testing requires connecting test lines to the P1 and P2 terminals and applying current signals. The height of the CT is generally 3-4 meters, and climbing is required to connect the P1 and P2 terminals for testing. Secondly, applying large current signals to the P1 and P2 terminals increases equipment cost and is inconvenient for rapid detection. Only a small current signal needs to be applied to the P1 and P2 terminals. A dozen milliamperes of current can be collected at the S1 and S2 terminals for calculation to determine the working condition of the CT polarity. When testing the CT polarity in the substation, it is necessary to climb up to the 4-meter-high CT and connect the P1 and P2 test lines. After the test is completed, it is necessary to climb up and remove the test lines. The test operation carries the risk of climbing. Secondly, traditional CT polarity testers mostly use large current generators, which are large in size and inconvenient for online use. At the same time, a small current is induced at the S1 and S2 terminals, and there is also the risk of live work during the test operation. Summary of the Invention

[0003] The purpose of the present invention is to provide a CT polarity testing method for preventing the risk of climbing high, so as to solve the problem in the above background technology that most CT polarity testers adopt large current generators, which are large in size and inconvenient for online use.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A method for testing CT polarity to prevent height risks includes a CT polarity tester. A PCB control board in the CT polarity tester includes a touch display module, a controller, a charging circuit, a switch, a discharge circuit, an energy storage capacitor, a polarity detection circuit, and a mutual inductor. A P1 terminal, a P2 terminal, an S1 terminal, and an S2 terminal are sequentially provided on one side of the CT polarity tester from top to bottom.

[0006] The specific test method is: by manipulating the touch display module, in terms of the test principle, the large current signal test method is changed to a small current pulse signal test method. The current signal generating circuit produces a group of small current pulse signals to the P1 and P2 terminals of the CT polarity tester. The S1 and S2 terminals of the CT polarity tester will sense a group of small current pulses. The pulse signals sensed by the S1 and S2 terminals are sent to the MCU. There will be a millisecond time difference. The pulse signals sensed by the S1 and S2 terminals are orthogonally encoded and input to the P1 terminal. When the pulse signal at the S1 terminal is fast, it is judged as polarity. When the pulse signal at the S2 terminal is fast, it can be judged as reverse polarity.

[0007] Preferably, the CT polarity tester includes an upper cover plate, a bottom plate and a power supply fixing plate.

[0008] Preferably, the controller is connected to the contact display module for receiving test instructions and outputting test results; the controller is connected to the charging part for controlling the charging circuit for charging; the controller is connected to the switching switch for controlling the switching switch to realize the switching of the charging and discharging circuits; the controller is connected to the polarity detection for receiving the polarity detection signal.

[0009] Preferably, the charging circuit is connected to the controller and the switch to charge the energy storage capacitor.

[0010] Preferably, the switching switch is connected to the controller, the charging circuit, the discharging circuit, and the energy storage capacitor to achieve switching of the charging and discharging circuits.

[0011] Preferably, the discharge circuit is connected to the switch and the transformer to discharge the energy storage capacitor and inject a pulse signal into the P1 and P2 terminals on one side of the transformer.

[0012] Preferably, the energy storage capacitor part is connected to the switching switch to realize energy storage and discharge functions.

[0013] Preferably, the transformer part under test (CT) is connected to the discharge circuit terminals P1 and P2 and the polarity detection circuit terminals S1 and S2.

[0014] Preferably, the touch display module realizes visual operation, is connected to the controller, issues test instructions, receives and displays test results on the touch display screen, and the touch display module adopts a 7-inch color LCD screen.

[0015] Preferably, the polarity detection circuit is connected to the secondary side S1 and S2 terminals of the transformer and the controller, and detects the transformer pulse signal and outputs it to the controller.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In this anti-height risk CT polarity test method, a current pulse signal less than 1A is used to test the CY polarity. A pulse current signal is input at the P1 terminal of the CT. S1 and S2 will obtain a pulse current signal output with millisecond-level speed characteristics. The CT polarity is determined by the front and back current pulse signals. In terms of test principle, the large current signal test method is changed to a small current pulse signal test method. The current signal generating circuit produces a group of small current pulse signals to the P1 and P2 terminals of the CT. The S1 and S2 terminals of the CT will sense a group of small current pulses. The pulse signals sensed by the S1 and S2 terminals are sent to the MCU with a millisecond-level time difference. The pulse signals sensed by the S1 and S2 terminals are orthogonally encoded and input to the P1 terminal. When the pulse signal at the S1 terminal is fast, the polarity can be determined. When the pulse signal at the S2 terminal is fast, it can be determined as reverse polarity.

[0018] 2. In this anti-height risk CT polarity test method, the volume and weight of the CT polarity tester developed by this method can be greatly reduced, making it convenient for on-site use and improving work efficiency. The P1 and P2 test rods are designed as four-section telescopic self-locking wooden rods with an insulation level of 10-750kV. They use a wide range of double-tongue spring locks or hanging wire heads, which can quickly connect the P1 and P2 output wires of φ2-4mm CTs. The CT polarity tester is small in size and easy to carry and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they provide further detailed explanations but do not constitute a limitation of the present invention.

[0020] Figure 1 It is a schematic diagram of the component modules of the present invention;

[0021] Figure 2 It is a schematic flow chart of the working principle of the present invention;

[0022] Figure 3 It is a structural schematic diagram of the CT polarity tester of the present invention;

[0023] Figure 4 It is a schematic diagram of the circuit principle of the present invention.

[0024] The meaning of the symbols in the figure:

[0025] 10. CT polarity tester body;

[0026] 20. Upper cover;

[0027] 30. Bottom plate;

[0028] 40. Power supply fixing plate. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention and the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] A CT polarity test method to prevent the risk of climbing Figure 1-Figure 4 As shown, it includes a CT polarity tester 10. The PCB control board in the CT polarity tester 10 includes a touch display module, a controller, a charging circuit, a switch, a discharge circuit, an energy storage capacitor, a polarity detection circuit and a mutual inductor. One side of the CT polarity tester 10 is provided with P1 terminal, P2 terminal, S1 terminal and S2 terminal from top to bottom. After the device is turned on, it enters the start waiting interface. When the user clicks the enable button on the interface, the device controller sends a switch switching signal, and the charging control signal charges the energy storage capacitor. When charging is completed, the controller sends a switch switching signal to switch to the discharge circuit. The polarity detection circuit performs detection. By sensing the pulse signal sent by the S1 terminal and the S2 terminal, when the pulse signal of the S1 terminal is fast, the polarity can be determined. When the pulse signal of the S2 terminal is fast, it can be determined as reverse polarity, and the result is output to the touch display module of the interface.

[0031] The specific test method is: by manipulating the touch display module, in terms of the test principle, the large current signal test method is changed to a small current pulse signal test method. The current signal generating circuit produces a group of small current pulse signals to the P1 and P2 terminals of the CT polarity tester 10. The S1 and S2 terminals of the CT polarity tester 10 will sense a group of small current pulses. The pulse signals sensed by the S1 and S2 terminals are sent to the MCU, and there will be a millisecond time difference. The pulse signals sensed by the S1 and S2 terminals are orthogonally encoded and input to the P1 terminal. When the pulse signal at the S1 terminal is fast, it is judged as polarity. When the pulse signal at the S2 terminal is fast, it can be judged as reverse polarity.

[0032] Furthermore, the CT polarity tester 10 includes an upper cover plate 20 , a bottom plate 30 and a power supply fixing plate 40 .

[0033] Specifically, the controller is connected to the contact display module to receive test instructions and output test results; the controller is connected to the charging part to control the charging circuit to charge; the controller is connected to the switching switch to control the switching switch to realize the switching of the charging and discharging circuits; the controller is connected to the polarity detection to receive the polarity detection signal, the charging circuit is connected to the controller and the switching switch to charge the energy storage capacitor, and the switching switch is connected to the controller, the charging circuit, the discharge circuit, and the energy storage capacitor to realize the switching of the charging and discharging circuits.

[0034] In addition, the discharge circuit is connected to the switching switch and the transformer to discharge the energy storage capacitor, and a pulse signal is injected into the P1 and P2 terminals on one side of the transformer. The energy storage capacitor part is connected to the switching switch to realize the energy storage and discharge functions.

[0035] Among them, the transformer part is tested CT, which is connected to the discharge circuit P1 and P2 ends and the polarity detection circuit S1 and S2 ends. The touch display module realizes visual operation, is connected to the controller, issues test instructions, receives and displays test results on the touch display screen. The touch display module uses a 7-inch color LCD screen. The polarity detection circuit part is connected to the transformer secondary side S1 and S2 ends and the controller to detect the transformer pulse signal output to the controller.

[0036] The present invention provides a method for testing the polarity of CT to prevent the risk of climbing. The method adopts a current pulse signal less than 1A to test the polarity of CY. A pulse current signal is input to the P1 terminal of the CT. S1 and S2 will obtain a pulse current signal output with a millisecond-level speed characteristic. The polarity of the CT is determined by the front and back current pulse signals. In terms of the test principle, the large current signal test method is changed to a small current pulse signal test method. The current signal generating circuit generates a group of small current pulse signals to the P1 and P2 terminals of the CT. The S1 and S2 terminals of the CT will sense a group of small current pulses. The pulse signals sensed by the S1 and S2 terminals are sent There will be a millisecond time difference between the time it takes to reach the MCU. By performing orthogonal encoding on the pulse signals induced by the S1 and S2 terminals, the pulse signals are input to the P1 terminal. When the pulse signal at the S1 terminal is fast, the polarity can be determined. When the pulse signal at the S2 terminal is fast, it can be determined as reverse polarity. The volume and weight of the CT polarity test developed by this method can be greatly reduced, which is convenient for on-site use and improves work efficiency. The test rods at the P1 and P2 terminals are designed as four-section telescopic self-locking wooden rods with an insulation grade of 10-750kV. They use a wide range of double-tongue spring locks or hanging wire heads, which can quickly connect the P1 and P2 terminals of φ2-4mm CTs.

[0037] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A CT polarity testing method for preventing height risks, characterized by: The invention comprises a CT polarity tester (10), wherein a PCB control board in the CT polarity tester (10) comprises a touch display module, a controller, a charging circuit, a switch, a discharge circuit, an energy storage capacitor, a polarity detection circuit, and a mutual inductor, and a P1 terminal, a P2 terminal, an S1 terminal, and an S2 terminal are sequentially provided on one side of the CT polarity tester (10) from top to bottom; The specific test method is as follows: by manipulating the touch display module, in terms of the test principle, the large current signal test method is changed to a small current pulse signal test method, the current signal generating circuit generates a group of small current pulse signals to the P1 terminal and the P2 terminal of the CT polarity tester (10), the S1 terminal and the S2 terminal of the CT polarity tester (10) will sense a group of small current pulses, the pulse signals sensed by the S1 terminal and the S2 terminal are sent to the MCU, there will be a millisecond time difference, by performing orthogonal coding on the pulse signals sensed by the S1 terminal and the S2 terminal, the pulse signal is input to the P1 terminal, when the pulse signal at the S1 terminal is fast, it is judged as polarity, and when the pulse signal at the S2 terminal is fast, it can be judged as reverse polarity.

2. The CT polarity testing method for preventing height risks according to claim 1, characterized in that: The CT polarity tester (10) comprises an upper cover plate (20), a bottom plate (30) and a power supply fixing plate (40).

3. The CT polarity testing method for preventing height-risk climbing according to claim 1, characterized in that: The controller is connected to the contact display module for receiving test instructions and outputting test results; the controller is connected to the charging part for controlling the charging circuit to charge; the controller is connected to the switching switch for controlling the switching switch to switch the charging and discharging circuits; the controller is connected to the polarity detection for receiving the polarity detection signal.

4. The CT polarity testing method for preventing height-risk climbing according to claim 1, characterized in that: The charging circuit is connected to the controller and the switch to charge the energy storage capacitor.

5. The CT polarity testing method for preventing height risks according to claim 1, characterized in that: The switching switch is connected to the controller, the charging circuit, the discharging circuit, and the energy storage capacitor to achieve switching of the charging and discharging circuits.

6. The CT polarity testing method for preventing height-risk climbing according to claim 1, characterized in that: The discharge circuit is connected to the switch and the mutual inductor to discharge the energy storage capacitor and inject a pulse signal into the P1 and P2 terminals on one side of the mutual inductor.

7. The CT polarity testing method for preventing height risks according to claim 1, characterized in that: The energy storage capacitor part is connected to the switching switch to realize energy storage and discharge functions.

8. The CT polarity testing method for preventing height risks according to claim 1, characterized in that: The transformer part under test, CT, is connected to the discharge circuit terminals P1 and P2 and the polarity detection circuit terminals S1 and S2.

9. The CT polarity testing method for preventing height risks according to claim 1, characterized in that: The touch display module realizes visual operation, is connected to the controller, issues test instructions, receives and displays test results on the touch display screen, and the touch display module adopts a 7-inch color LCD screen.

10. The CT polarity testing method for preventing height risks according to claim 1, characterized in that: The polarity detection circuit is connected to the secondary side S1 and S2 of the transformer and the controller, and detects the transformer pulse signal and outputs it to the controller.

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