CT polarity testing device

Abstract

The utility model relates to the technical field of power system testing, in particular to a CT polarity testing device which comprises a CT polarity testing module and a voice control module. The CT polarity test module comprises a direct-current power supply, a rotary switch, a manual control intermediate relay, a manual test button, a voice control intermediate relay, a current transformer and a microammeter; the voice control module comprises a microphone unit and a voice recognition unit; and the voice recognition unit is respectively in signal connection with the microphone unit, the manual control intermediate relay and the voice control intermediate relay, and is used for converting the voice electric signal into a voice control signal and controlling the manual control intermediate relay and the voice control intermediate relay. The relay is tested through voice control, errors caused by operation while testing in the testing process are avoided, and the measuring efficiency is improved. Meanwhile, multiple detection modes are provided, the most suitable control mode can be selected according to the actual situation, and the detection efficiency can be further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power system testing, in particular to a CT polarity testing device. Background Art

[0002] Currently, during substation relay commissioning, current transformer (CT) polarity testing is required. The polarity test results are a crucial factor in determining the successful commissioning of the substation and its associated equipment. Existing CT polarity testing requires at least two people, often using scattered potassium batteries and other test equipment, and employing the traditional method of manually touching the batteries to verify polarity.

[0003] Chinese patent CN204666764U discloses a "CT polarity detection device." This system offers both manual and remote control. Remote control improves testing efficiency when the current transformer is located far from the terminal box. However, at commissioning sites, CT polarity testing is a complex process requiring the cooperation of at least two people. Even with remote control, operating the remote device while testing can be inconvenient and prone to errors, impacting measurement efficiency and resulting in inaccurate results. Utility Model Content

[0004] In view of this, it is necessary to provide a CT polarity testing device to solve the problems in the prior art of easy errors and inaccurate measurement results in long-distance testing.

[0005] A CT polarity test device comprises: a CT polarity test module and a voice control module; the CT polarity test module comprises a DC power supply, a rotary switch, a manually controlled intermediate relay, a manual test button, a voice controlled intermediate relay, a current transformer and a microammeter; the primary positive terminal of the current transformer is electrically connected to the positive pole of the DC power supply, and the primary negative terminal of the current transformer is electrically connected to the positive input terminal of the rotary switch; the rotary switch comprises at least two switching gears, the output terminal of the first switching gear of the rotary switch is electrically connected to the negative pole of the DC power supply through the manually controlled intermediate relay and the manual test button; the output terminal of the second switching gear of the rotary switch is electrically connected to the negative pole of the DC power supply. The voice control intermediate relay is electrically connected to the negative pole of the DC power supply; the positive terminal of the microammeter is electrically connected to the positive terminal of the secondary side of the current transformer, and the negative terminal of the microammeter is electrically connected to the negative terminal of the secondary side of the current transformer, so as to test the polarity of the current transformer; the voice control module includes a microphone unit and a voice recognition unit; the microphone unit is used to convert the voice signal into a voice electrical signal; the voice recognition unit is respectively connected to the microphone unit, the manual control intermediate relay and the voice control intermediate relay signals, so as to convert the voice electrical signal into a voice control signal and control the manual control intermediate relay and the voice control intermediate relay.

[0006] Preferably, the voice control module further includes a speaker; the speaker is connected to the voice recognition unit signal, and is used to obtain the voice control signal and perform a sound reminder according to the voice control signal.

[0007] Preferably, the microphone unit is connected to the voice recognition unit signal in a wireless manner.

[0008] Preferably, the speech recognition unit includes a single chip microcomputer, an integrated circuit and a chip.

[0009] Preferably, it also includes a wireless control module; the wireless control module includes a wireless transmitting unit, a wireless receiving unit and a remote control output relay; the wireless transmitting unit is used to send electromagnetic signals to the wireless receiving unit via wireless means; the wireless receiving unit is signal-connected to the remote control output relay, and is used to control the remote control output relay according to the electromagnetic signal received from the wireless transmitting unit; the output end of the third switching gear of the rotary switch is electrically connected to the negative pole of the DC power supply through the remote control output relay.

[0010] Preferably, a second power supply is also included for supplying power to the voice control module and the wireless receiving unit.

[0011] Compared with existing technologies, the present invention offers the following advantages: By controlling the relay through voice control, errors caused by operating the relay while testing are avoided, thereby improving measurement efficiency. Furthermore, multiple detection modes, including manual control, wireless control, and voice control, are provided, allowing users to select the most appropriate control mode based on their actual needs, further improving detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a circuit connection diagram of the utility model.

[0013] Figure 2 Another circuit connection diagram of the present invention.

[0014] In the figure: second power supply DY, power switch S of second power supply, voice control module AI, wireless transmitting unit WF, wireless receiving unit WS, microphones MK1, MK2, manual control intermediate relay ZJ1, remote control intermediate relay ZJ2, voice control intermediate relays ZJ3, ZJ4, speaker BL, remote control output relay ZJ5, DC power supply DC, banana plug terminals P1, P2, S1, S2, current transformer TA, microammeter μA, manual test button AN, rotary switch SA. DETAILED DESCRIPTION

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, a brief introduction will be given below to the drawings required for use in the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] See Figure 1-2 , Figure 1 This is a circuit connection diagram of the voice control module of the present utility model; Figure 2 Schematic diagram of circuit connection of the CT polarity test module of the present invention. The CT polarity test device comprises: a CT polarity test module and a voice control module.

[0017] The CT polarity test module includes a DC power supply, a rotary switch, a manual control relay, a manual test button, a voice control relay, a current transformer, and a microammeter. The DC power supply can be a 12V lithium battery pack.

[0018] The positive primary terminal of the current transformer is electrically connected to the positive terminal of the DC power supply, and the negative primary terminal of the current transformer is electrically connected to the positive input terminal of the rotary switch. Specifically, the current transformer TA can be connected to the DC power supply DC, the microammeter μA, and the rotary switch SA via preset banana plug terminals P1, P2, S1, and S2. For example, the positive terminal of the microammeter μA is electrically connected to the positive secondary terminal S1 of the current transformer, and the negative terminal of the microammeter is electrically connected to the negative secondary terminal S2 of the current transformer.

[0019] The rotary switch SA can include a knob-type switching handle, a knob-type switch, a dial switch, and an encoder switch. In this embodiment, the rotary switch SA has at least two switching positions. The output of the first switching position is electrically connected to the negative terminal of the DC power supply via a manually controlled intermediate relay ZJ1 and a manual test button AN. The output of the second switching position is electrically connected to the negative terminal of the DC power supply via voice-controlled intermediate relays ZJ3 and ZJ4. The rotary switch enables rapid switching between multiple control modes, simplifying the operation process and improving work efficiency. The manual test button provides direct control in emergency situations, increasing device reliability and availability.

[0020] Furthermore, the voice-controlled intermediate relay includes a primary relay ZJ3 and a secondary relay ZJ4. When the circuit is closed, the normally open terminal of primary relay ZJ3 is electrically connected to the normally closed terminal of secondary relay ZJ4. By configuring primary relay ZJ3 and secondary relay ZJ4, during polarity testing, a known current pulse is generated on the primary side by briefly turning on the power supply. This avoids potential safety issues that could arise from prolonged current application, such as overheating or damage to the CT. During testing, the secondary relay prevents the secondary side from opening, which could pose a risk to personnel and equipment.

[0021] The voice control module includes a microphone unit MK and a voice recognition unit; the microphone unit is used to convert voice signals into voice electrical signals; the voice recognition unit is respectively connected to the microphone unit, the manual control intermediate relay and the voice control intermediate relay signals, and is used to convert voice electrical signals into voice control signals and control the manual control intermediate relay and the voice control intermediate relay.

[0022] Furthermore, the voice control module also includes a speaker BL; the speaker is connected to the voice recognition unit signal, and is used to receive the voice control signal and issue a voice reminder based on the voice control signal. The feedback mechanism of the speaker enhances the human-computer interaction experience and improves the intuitiveness and accuracy of operation.

[0023] Furthermore, the microphone unit is connected to the voice recognition unit signal in a wireless manner. The microphone unit can also be a dual microphone MK1, MK2 with a noise reduction function.

[0024] Furthermore, voice recognition units include microcontrollers, integrated circuits, and chips. Many off-the-shelf chips or integrated circuits can be used for voice recognition control. These chips typically have some voice recognition capabilities, capable of recognizing preset command words or phrases. Alternatively, microcontrollers can support simple voice recognition functionality through software libraries or development boards.

[0025] For example, the voice recognition unit is a single-chip microcomputer, and the voice control of the relay opening and closing through the single-chip microcomputer may include: selecting a single-chip microcomputer that supports the voice recognition function, such as Arduino Uno / Nano.

[0026] The microphone is electrically connected to an analog input pin of the microcontroller for receiving sound. The relay module is electrically connected to a digital output pin of the microcontroller. The speaker is electrically connected to a PWM output pin of the microcontroller for playing a prompt tone.

[0027] Configure the MCU's GPIO pins for input or output mode, set up the MCU's ADC (analog-to-digital converter) to read the microphone input, and set up PWM output for the speaker.

[0028] The system continuously monitors microphone input and triggers the voice recognition process when a valid voice signal is detected. For example, if a voice control command "Polarity test" is issued, the speaker will respond with a voice message saying, "Please take safety precautions, confirm wiring is correct, switch the rotary switch to voice control mode, and turn on the test power to begin the test." The system can then control the opening and closing of the relay based on the recognition result, and a confirmation message will be played through the speaker.

[0029] Furthermore, the device also includes a wireless control module; the wireless control module includes a wireless transmitting unit WF, a wireless receiving unit WS, and a remote control output relay ZJ5. The wireless transmitting unit WF is used to wirelessly transmit electromagnetic signals to the wireless receiving unit; the wireless receiving unit WS is connected to the remote control output relay and controls the remote control output relay based on the electromagnetic signals received from the wireless transmitting unit. The output terminal of the third switching position of the rotary switch is electrically connected to the negative terminal of the DC power supply through the remote control output relay. The remote control function allows the tester to be operated away from the test site, making it suitable for long-distance, noisy, or inaccessible environments. The appropriate detection method can be selected according to the situation, which can improve detection efficiency.

[0030] Furthermore, the system further includes a second power supply electrically connected to the voice control module and the wireless receiving unit for supplying power. The second power supply may be a 5V DC power supply that can be connected in parallel to the voice control module and the wireless receiving unit, effectively simplifying circuitry and wiring connections.

[0031] The utility model has been applied and fully verified in practice in current transformer polarity tests in multiple substations. The tester uses three modes of voice control, wireless control, and manual button control to completely replace manual touch control equipment and simple wireless control equipment. The CT polarity test can be completed by one person operating and one person monitoring, which effectively improves work efficiency, solves the polarity test problem when the current transformer and the terminal box are not in the same location, and replaces the original test equipment.

[0032] The following is an introduction to the usage and working principle of the device of the utility model in combination with specific embodiments: Implementation of voice control:

[0033] Correctly connect the ends of the current transformer (TA) under test and the probes of the μA microammeter to the banana terminals P1, P2, S1, and S2. Turn on the switch S of the second power supply, connect the wireless dual-microphones MK1 and MK2, and issue the voice control command "Polarity Test." The speaker BL will respond with the voice message "Please take safety precautions, confirm the wiring is correct, and turn on the test power to begin the test." Switch the rotary switch SA to voice control mode and issue the voice control command "Polarity Test." The voice control module receives the command and momentarily closes the voice control relays ZJ3 and ZJ4. The speaker BL will respond with the voice message "Positive-Negative." Observe the deflection direction of the μA microammeter: clockwise deflection indicates positive polarity, and counterclockwise deflection indicates negative polarity. After the test, issue the voice control command "Test End." The speaker BL will respond with the voice message "OK, please switch the handle to the middle position, turn off the power, and clean up the site."

[0034] Wireless control implementation:

[0035] Correctly connect the two ends of the current transformer (TA) under test and the μA probes to the banana terminals P1, P2, S1, and S2. Turn on the device's power switch S, connect the wireless dual-microphones MK1 and MK2, and issue the voice control command "Polarity test." The speaker BL responds with the voice message "Please take safety measures, confirm the wiring is correct, turn on the test power, and prepare to begin the test." Continue issuing the voice command "Remote control mode." The voice control module receives the command and closes the remote control intermediate relay ZJ2. The speaker BL responds with the voice message "Switch the handle to remote control mode and begin the test." Now switch the rotary switch SA to wireless control mode. Use the wireless transmitting unit WF to send a control signal, which the wireless receiving unit WS receives and controls the remote control output relay ZJ5 to jog and close. Observe the deflection direction of the μA pointer: clockwise deflection indicates positive polarity, and counterclockwise deflection indicates reverse polarity. After the test, issue the voice control command "Test ended." The speaker BL responds with the voice message "OK, please switch the handle to the middle position, turn off the power, and clean up the site."

[0036] Manual control implementation:

[0037] Correctly connect the two ends of the current transformer TA under test and the pointer microammeter μA probe to the banana plug terminals P1, P2, S1, and S2, turn on the power switch S of the equipment, connect the wireless dual-microphones MK1 and MK2, and issue the voice control command "Polarity test". The speaker BL responds with a voice message "Please take safety measures, confirm that the wiring is correct, turn on the test power and prepare to start the test". Continue to issue the voice command "Manual mode". After receiving the voice command, the voice control module controls the manual control intermediate relay ZJ1 to close. The speaker BL responds with a voice message "Switch the handle to manual mode and start the test". At this time, switch the knob-type switching handle SA to manual control mode and turn on the manual test button AN. At this time, observe the deflection direction of the pointer microammeter μA. Clockwise deflection indicates positive polarity, and counterclockwise deflection indicates reverse polarity. After the test, issue the voice control command "Test end". The speaker BL responds with a voice message "OK, please switch the handle to the middle position, turn off the power, and clean up the site".

Claims

1. A CT polarity test device, characterized in that: include: CT polarity test module and voice control module; The CT polarity test module includes a DC power supply, a rotary switch, a manual control intermediate relay, a manual test button, a voice control intermediate relay, a current transformer and a microammeter; The primary positive terminal of the current transformer is electrically connected to the positive electrode of the DC power supply, and the primary negative terminal of the current transformer is electrically connected to the positive input terminal of the rotary switch; The rotary switch includes at least two switching gears, the output end of the first switching gear of the rotary switch is electrically connected to the negative electrode of the DC power supply through the manual control intermediate relay and the manual test button; the output end of the second switching gear of the rotary switch is electrically connected to the negative electrode of the DC power supply through the voice control intermediate relay; The positive terminal of the microammeter is electrically connected to the positive terminal of the secondary side of the current transformer, and the negative terminal of the microammeter is electrically connected to the negative terminal of the secondary side of the current transformer, for testing the polarity of the current transformer; The voice control module includes a microphone unit and a voice recognition unit; the microphone unit is used to convert a voice signal into a voice electrical signal; the voice recognition unit is respectively connected to the microphone unit, the manual control intermediate relay and the voice control intermediate relay signals, and is used to convert the voice electrical signal into a voice control signal and control the manual control intermediate relay and the voice control intermediate relay.

2. The device according to claim 1, characterized in that The voice control module also includes a speaker; the speaker is connected to the voice recognition unit signal, and is used to obtain the voice control signal and make a sound reminder according to the voice control signal.

3. The device according to claim 1, characterized in that The microphone unit is connected to the voice recognition unit signal in a wireless manner.

4. The device according to any one of claims 1 to 3, characterized in that The speech recognition unit includes a single chip microcomputer, an integrated circuit and a chip.

5. The device according to claim 1, characterized in that Also includes a wireless control module; The wireless control module includes a wireless transmitting unit, a wireless receiving unit and a remote control output relay; the wireless transmitting unit is used to send an electromagnetic signal to the wireless receiving unit via wireless means; the wireless receiving unit is connected to the remote control output relay for signal control according to the electromagnetic signal received from the wireless transmitting unit. The output end of the third switching gear of the rotary switch is electrically connected to the negative electrode of the DC power supply through the remote control output relay.

6. The device according to claim 5, characterized in that Also included is a second power source; The second power supply is used to supply power to the voice control module and the wireless receiving unit.

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