CN214503873U - Portable current transformer polarity calibrator - Google Patents
Portable current transformer polarity calibrator Download PDFInfo
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- CN214503873U CN214503873U CN202022609299.4U CN202022609299U CN214503873U CN 214503873 U CN214503873 U CN 214503873U CN 202022609299 U CN202022609299 U CN 202022609299U CN 214503873 U CN214503873 U CN 214503873U
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Abstract
The utility model discloses a portable current transformer polarity check gauge, include: a pressurizing end and a testing end; the pressurizing end is connected with one end of the line to be tested, the inspection end is connected with the other end of the line to be tested, and the pressurizing end is connected with the inspection end through wireless communication; the pressurizing end is used for inputting voltage waves to a line to be tested; the inspection end is used for receiving voltage waves in a line to be tested and displaying that the polarities of the current transformers are the same or opposite according to the fact that the polarities of the received voltage wave amplitudes are the same or opposite to the polarities of the input voltage wave amplitudes. The utility model discloses with detection device's pressurization end and checkout end independent setting, establish both data interaction through remote communication, can realize long distance line detection.
Description
Technical Field
The utility model relates to a polarity check-up technical field, concretely relates to portable current transformer polarity check-up appearance.
Background
In the relay protection devices of various devices of the power system, current is required to be used as a fault criterion, and some protection needs to determine the direction of the current to judge whether the fault is a positive direction fault or a negative direction fault. When the fault meets the positive direction fault, the protection action trips, and when the fault meets the negative direction fault, the protection does not act. If the polarity judgment and the resolution are wrong, the protection refuses to operate when the positive direction fails, and the accident is expanded. It is important to determine the accuracy of the current direction.
Most of the existing polarity check instruments of the current transformer are integrated in a current tester, the defect is that the equipment quality is too heavy, a primary loop and a secondary loop of the instrument and the polarity check instrument of the current transformer need to be connected through electric wires, the connection length of the circuits is limited, the polarity check instruments can only adapt to limited occasions, and the polarity check on the polarity correctness of a current terminal between an outdoor switch and a protection screen in a control room is impossible.
Another method is to use the method of applying the voltage to the primary side instantaneously by the battery and looking at the deflection direction of the secondary side voltmeter and the like, and such methods lack the equipment to give a definite result and require the skilled person to have the knowledge.
Disclosure of Invention
The utility model provides a portable current transformer polarity check gauge to solve among the prior art test distance short, test result judge difficult technical problem.
The utility model provides a portable current transformer polarity check gauge, include: a pressurizing end and a testing end; the pressurizing end is connected with one end of the line to be tested, the inspection end is connected with the other end of the line to be tested, and the pressurizing end is connected with the inspection end through wireless communication; the pressurizing end is used for inputting voltage waves to a line to be tested; the inspection end is used for receiving voltage waves in a line to be tested and displaying that the polarities of the current transformers are the same or opposite according to the fact that the polarities of the received voltage wave amplitudes are the same or opposite to the polarities of the input voltage wave amplitudes.
Further, the pressurizing end includes: the device comprises a power supply, a reference voltage wave generation circuit, a voltage limiting circuit, a first controller circuit, a forward addition circuit, a digital-to-analog conversion circuit, a multiplier circuit, a first wireless communication circuit and a first touch display circuit; the power supply supplies power to other circuits, and the output end of the reference voltage wave generating circuit and the output end of the voltage limiting circuit are connected to the input end of the forward addition circuit; the first controller circuit is respectively connected with the digital-to-analog conversion circuit, the first wireless communication circuit and the first touch display circuit; the output end of the digital-to-analog conversion circuit and the output end of the forward addition circuit are connected with the input end of the multiplier circuit; and the output end of the multiplier circuit is connected with a line to be tested.
Further, the reference voltage wave generating circuit includes: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a diode D1, a bidirectional voltage stabilizing diode Uz1, an operational amplifier U1 and an operational amplifier U2; the voltage limiting circuit includes: a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a bidirectional voltage stabilizing diode Uz, an operational amplifier U3 and an operational amplifier U4; the forward addition circuit includes: the circuit comprises a resistor R15, a resistor R16, a resistor R17, a resistor R18 and an operational amplifier U5; the multiplier circuit includes a multiplier U6; the digital-to-analog conversion circuit includes: the digital-to-analog converter U7, the resistor R19 and the resistor R20;
The positive input end of the operational amplifier U1 is respectively connected with one end of a resistor R1 and one end of a resistor R2, the negative input end of the operational amplifier U1 is connected with one end of a resistor R3, and the output end of the operational amplifier is connected with one end of a resistor R8; the other end of the resistor R3 is grounded; the other end of the resistor R2 is respectively connected with the other end of the resistor R8, one end of the resistor R10, one end of the resistor R9 and one end of a bidirectional voltage stabilizing diode Uz 1; the other end of the bidirectional voltage stabilizing diode Uz1 is grounded; the other end of the resistor R9 is connected with the anode of a diode D1; the cathode of the diode D1 is respectively connected with one end of the capacitor C1, one end of the resistor R10 and the cathode input end of the operational amplifier U2; the positive electrode input end of the operational amplifier U2 is connected with one end of the resistor R11; the other end of the resistor R11 is grounded; the other end of the resistor R1 is respectively connected with the other end of the capacitor C1 and one end of the resistor 15; the negative electrode input end of the operational amplifier U3 is respectively connected with one end of a resistor R9 and one end of a resistor R10, and the positive electrode input end of the operational amplifier U3 is connected with one end of a resistor R11; the other end of the resistor R9 is respectively connected with one end of the resistor R8 and one end of a bidirectional voltage stabilizing diode Uz 2; the other end of the resistor R8 is connected with a power supply Vcc; the other end of the bidirectional voltage stabilizing diode Uz2 is grounded; the other end of the resistor R11 is grounded; the positive electrode output end of the operational amplifier U3 is respectively connected with the other end of the resistor R10 and the other end of the resistor R12; the negative electrode input end of the operational amplifier U4 is respectively connected with the other end of the resistor R12 and one end of the resistor R13, and the positive electrode input end of the operational amplifier U4 is connected with one end of the resistor R14; the other end of the resistor R14 is grounded; the positive electrode output end of the operational amplifier U4 is respectively connected with the other end of the resistor R13 and one end of the resistor R16; the positive input end of the operational amplifier U5 is respectively connected with the other end of the resistor R15 and the other end of the resistor R16, and the negative input end of the operational amplifier U5 is respectively connected with one end of the resistor R17 and one end of the resistor R18; the other end of the resistor R17 is grounded, and the positive output end of the operational amplifier U5 is respectively connected with the other end of the resistor R18 and one input end of the multiplier U6; the output end of the first controller circuit is connected with the input end of the digital-to-analog converter U7; the Vcc end of the digital-to-analog converter U7 is respectively connected with a power supply Vcc and one end of a resistor R19, the VREF end of the digital-to-analog converter U7 is respectively connected with the other end of the resistor R19 and one end of the resistor R20, and the output end of the operational amplifier U7 is connected with the other input end of the multiplier U6; the other end of the resistor R20 is grounded; and the output end of the multiplier U6 is connected with a line to be tested.
Further, the inspection end includes: the wireless touch display device comprises a power supply, a voltage detection circuit, a second touch display circuit, a second controller circuit and a second wireless communication circuit; the power supply supplies power to other circuits respectively; the second controller circuit is respectively connected with the output end of the voltage detection circuit, the second touch display circuit and the second wireless communication circuit; and the input end of the voltage detection circuit is connected with a line to be detected.
Further, the voltage detection circuit includes: a resistor 21, a capacitor C2 and a digital voltmeter V1; the anode of the line to be tested is connected with one end of the resistor R21; the other end of the resistor R21 is respectively connected with one end of a capacitor C2 and the anode of a digital voltmeter V1; the negative electrode of the circuit to be tested is respectively connected with the other end of the capacitor C2 and the negative electrode of the digital voltmeter V1; the output end of the digital voltmeter V1 is connected with the second controller circuit.
The utility model has the advantages that:
the utility model discloses with detection device's pressurization end and checkout end independent setting, establish both data interaction through remote communication, can realize long distance line detection. The utility model discloses a pressurization end produces the voltage wave, and the demodulation is carried out to the voltage wave through the inspection end again, also can realize long distance signal of telecommunication transmission, improves and detects the accuracy. The utility model discloses a pressurization end is at current transformer primary side applied voltage, acquires voltage at the current transformer secondary side through the check end, carries out the same with both sides voltage whether react current transformer both sides polarity relation, can be fast, the accurate current transformer both sides polarity relation of giving and show. The utility model discloses regard as mainly controlling the end with the check end, when pressurization end and check end establish remote communication and connect, adjust pressurization end output voltage and start the detection through the check end, can adjust output voltage value at any time according to the testing result of check end, improve detection security and accuracy. The utility model discloses be joining the circuit that awaits measuring with the pressurization end, the control pressurization end produces the high voltage with the output voltage zero clearing, avoids the check-up end when joining, improves and detects the security.
Drawings
The features and advantages of the invention will be more clearly understood by reference to the accompanying drawings, which are schematic and should not be understood as imposing any limitation on the invention, in which:
FIG. 1 is a circuit diagram of an embodiment of a pressurizing end of the present invention;
FIG. 2 is a circuit diagram of an embodiment of the calibration terminal of the present invention;
FIG. 3 is a schematic view of the pressurizing end device of the present invention;
FIG. 4 is a schematic view of the calibration end device of the present invention;
FIG. 5 is a voltage waveform diagram generated by the reference voltage waveform generating circuit of the voltage applying terminal according to the present invention;
FIG. 6 is a diagram of a voltage waveform generated by the forward adder circuit of the present invention;
fig. 7 is a graph of the voltage waveform generated by the multiplier circuit of the present invention;
FIG. 8 is a waveform diagram received by the calibration terminal and a voltage diagram after filtering when the current transformer is of a decreasing polarity type;
fig. 9 is a waveform diagram received by the calibration terminal and a voltage diagram after filtering when the current transformer is polarized.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
The embodiment of the utility model provides a portable current transformer polarity check gauge, include: a pressurizing end and a testing end; the pressurizing end is connected with one end of the line to be tested, the testing end is connected with the other end of the line to be tested, and the pressurizing end is connected with the testing end through wireless communication; the pressurizing end is used for inputting voltage waves to a line to be tested; the inspection end is used for receiving voltage waves in a line to be tested and displaying that the polarities of the current transformers are the same or opposite according to the fact that the polarities of the received voltage wave amplitudes are the same or opposite to the polarities of the input voltage wave amplitudes.
As shown in fig. 3, the device case is a device case with a pressurizing end, and the device case is provided with an antenna 1, a device switch 2, a positive terminal 31, a negative terminal 32, and a touch display 4; the touch display 4 is provided with a voltage amplitude display of the voltage wave output by the pressurizing end and an adjusting button for amplitude increase and decrease and a control button for starting and stopping verification.
The pressure end includes: the device comprises a power supply, a reference voltage wave generation circuit, a voltage limiting circuit, a first controller circuit, a forward addition circuit, a digital-to-analog conversion circuit, a multiplier circuit, a first wireless communication circuit and a first touch display circuit; the power supply supplies power to other circuits, and the output end of the reference voltage wave generating circuit and the output end of the voltage limiting circuit are connected to the input end of the forward adding circuit; the first controller circuit is respectively connected with the digital-to-analog conversion circuit, the first wireless communication circuit and the first touch display circuit; the output end of the digital-to-analog conversion circuit and the output end of the forward addition circuit are connected with the input end of the multiplier circuit; the output of the multiplier circuit is connected to the positive terminal 31; the first touch display circuit is connected with the touch display 4. The touch display 4 is used to control the start and stop of the operation of the pressurizing end and the adjustment of the voltage value.
As shown in fig. 1, the reference voltage wave generating circuit includes: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a diode D1, a bidirectional voltage stabilizing diode Uz1, an operational amplifier U1 and an operational amplifier U2; the voltage limiting circuit includes: a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a bidirectional voltage stabilizing diode Uz, an operational amplifier U3 and an operational amplifier U4; the forward addition circuit includes: the circuit comprises a resistor R15, a resistor R16, a resistor R17, a resistor R18 and an operational amplifier U5; the multiplier circuit includes a multiplier U6; the digital-to-analog conversion circuit includes: the digital-to-analog converter U7, the resistor R19 and the resistor R20, wherein the digital-to-analog converter U7 is preferably a CJMCU-5615 chip;
the positive input end of the operational amplifier U1 is respectively connected with one end of the resistor R1 and one end of the resistor R2, the negative input end of the operational amplifier U1 is connected with one end of the resistor R3, and the output end of the operational amplifier is connected with one end of the resistor R8; the other end of the resistor R3 is grounded; the other end of the resistor R2 is respectively connected with the other end of the resistor R8, one end of the resistor R10, one end of the resistor R9 and one end of the bidirectional voltage stabilizing diode Uz 1; the other end of the bidirectional voltage stabilizing diode Uz1 is grounded; the other end of the resistor R9 is connected with the anode of the diode D1; the cathode of the diode D1 is respectively connected with one end of the capacitor C1, one end of the resistor R10 and the cathode input end of the operational amplifier U2; the positive input end of the operational amplifier U2 is connected with one end of the resistor R11; the other end of the resistor R11 is grounded; the other end of the resistor R1 is connected with the other end of the capacitor C1 and one end of the resistor 15 respectively; the negative electrode input end of the operational amplifier U3 is respectively connected with one end of the resistor R9 and one end of the resistor R10, and the positive electrode input end of the operational amplifier U3 is connected with one end of the resistor R11; the other end of the resistor R9 is respectively connected with one end of a resistor R8 and one end of a bidirectional voltage stabilizing diode Uz 2; the other end of the resistor R8 is connected with a power supply Vcc; the other end of the bidirectional voltage stabilizing diode Uz2 is grounded; the other end of the resistor R11 is grounded; the positive electrode output end of the operational amplifier U3 is respectively connected with the other end of the resistor R10 and the other end of the resistor R12; the negative electrode input end of the operational amplifier U4 is respectively connected with the other end of the resistor R12 and one end of the resistor R13, and the positive electrode input end of the operational amplifier U4 is connected with one end of the resistor R14; the other end of the resistor R14 is grounded; the positive electrode output end of the operational amplifier U4 is respectively connected with the other end of the resistor R13 and one end of the resistor R16; the positive input end of the operational amplifier U5 is respectively connected with the other end of the resistor R15 and the other end of the resistor R16, and the negative input end of the operational amplifier U5 is respectively connected with one end of the resistor R17 and one end of the resistor R18; the other end of the resistor R17 is grounded, and the anode output end of the operational amplifier U5 is respectively connected with the other end of the resistor R18 and one input end of the multiplier U6; the output end of the first controller circuit is connected with the input end of the digital-to-analog converter U7; the Vcc end of the digital-to-analog converter U7 is respectively connected with a power supply Vcc and one end of a resistor R19, the VREF end of the digital-to-analog converter U7 is respectively connected with the other end of the resistor R19 and one end of the resistor R20, and the output end of the operational amplifier U7 is connected with the other input end of the multiplier U6; the other end of the resistor R20 is grounded; the output end of the multiplier U6 is connected with a line to be tested.
As shown in fig. 4, in order to verify the end device box, the device box is provided with an antenna 5, a device switch 6, a positive terminal 71, a negative terminal 72, a touch display 8 and an indicator light 9.
The inspection end includes: the wireless touch display device comprises a power supply, a voltage detection circuit, a second touch display circuit, a second controller circuit and a second wireless communication circuit; the power supply supplies power to other circuits respectively; the second controller circuit is respectively connected with the output end of the voltage detection circuit, the second touch display circuit and the second wireless communication circuit; the input end of the voltage detection circuit is connected with a line to be detected; the second touch display circuit is connected to the touch display 8.
As shown in fig. 2, the voltage detection circuit includes: a resistor 21, a capacitor C2 and a digital voltmeter V1; the anode of the line to be tested is connected with one end of a resistor R21; the other end of the resistor R21 is respectively connected with one end of a capacitor C2 and the anode of a digital voltmeter V1; the negative electrode of the circuit to be tested is respectively connected with the other end of the capacitor C2 and the negative electrode of the digital voltmeter V1; the output terminal of the digital voltmeter V1 is connected with the second controller circuit.
The first controller circuit and the second controller circuit can be composed of an STC15W4K32S4 chip and peripheral circuits thereof; the first remote communication circuit and the second remote communication circuit can be formed by HC-12 Bluetooth chips and peripheral circuits thereof.
The utility model discloses application method and theory of operation as follows:
step 1: connecting the pressurizing end to one end of the line to be tested, resetting the voltage amplitude value of the pressurizing end, and connecting the inspection end to the other end of the line to be tested;
step 2: the pressurizing end and the testing end establish a telecommunication connection,
when the remote communication connection is established between the pressurizing end and the inspection end, the voltage amplitude is adjusted at the inspection end through the touch display 8, and the second controller circuit sends the set voltage amplitude to the first controller circuit through the second remote communication circuit to adjust the output voltage amplitude of the pressurizing end;
when the remote communication connection is not established between the pressurizing end and the testing end, the voltage amplitude is adjusted at the pressurizing end through the touch display 4;
when the remote communication connection is established between the pressurizing end and the checking end, the checking end starts the pressurizing end to generate voltage waves; when the remote communication connection between the pressurizing end and the verifying end is not established, the pressurizing end is started by itself to generate voltage waves;
after the pressurizing end is started: the reference voltage wave generating circuit generates a sawtooth-shaped voltage wave as shown in fig. 5, the circuit provides a reference voltage through a bidirectional voltage stabilizing diode Uz1, the voltage amplitude UL of the output sawtooth-shaped voltage wave is UL-Uz 1 xR 1/R2, and the voltage amplitude UL of the sawtooth-shaped voltage wave can be 0.5V by adjusting the ratio of R1 and R2 and the cooperation of Uz 1. The voltage limiting circuit outputs a direct-current voltage with the voltage Uz2 multiplied by R1/R2 through two inverse proportion operation circuits. The sawtooth voltage wave generated by the reference voltage wave generating circuit and the direct current voltage generated by the voltage limiting circuit are added through the forward adding circuit to obtain the sawtooth voltage wave with the voltage amplitude of 0 to +2UL, and when UL is 0.5V, the voltage amplitude of the sawtooth voltage wave is 0 to 1V. Because the voltage amplitude of the sawtooth voltage wave output by the forward addition circuit is small, loss or interference exists in the transmission of a line to be tested, and the receiving accuracy of the verification end is reduced, the sawtooth voltage wave needs to be boosted, and the boosted amplitude can be adjusted to be 0.01V through a voltage adjusting button on the touch display. The first controller circuit sends the received voltage amplitude adjusting amplitude sent by the second controller circuit or the adjusting amplitude provided by the touch display 4 to the digital-to-analog conversion circuit for digital-to-analog conversion, converts a digital signal representing the voltage amplitude into an analog signal of the voltage amplitude, the analog voltage output range of the CJMCU-5615 chip is 0-2 VREF, and VREF can be obtained by resistance voltage division to be 2.5V. The voltage amplitude analog signal output by the digital-to-analog conversion circuit and the output sawtooth voltage wave of the forward addition circuit are connected to a multiplier circuit together for multiplication, and the multiplier circuit outputs the sawtooth voltage wave with the voltage amplitude of 0-U0 at the upper and lower limits as shown in FIG. 7.
And step 3: the verification end receives the sawtooth voltage wave in the step 2, when the voltage transformer is of a polarity reduction type, the two sides of the voltage transformer are in the same phase, the sawtooth voltage wave cannot be changed on the secondary side, and the sawtooth voltage wave received by the verification end is a sawtooth voltage wave with a voltage amplitude of 0-U0 as shown in a figure 8 (a); when the voltage transformer is polarized, the two sides of the voltage transformer are inverted, the secondary side changes the sawtooth voltage wave, and the sawtooth voltage wave received by the verification end is the sawtooth voltage wave with the voltage amplitude of 0 to-U0 as shown in fig. 9 (a). The verifying terminal rectifies the sawtooth-shaped voltage wave through the RC rectifying circuit to obtain a voltage value of the received sawtooth-shaped voltage wave, as shown in fig. 8(b) and 9(b), at this time, the voltage value is U0 or-U0;
and 4, step 4: the verifying terminal judges whether the polarity of the voltage value obtained in the step 3 is the same as the polarity of the voltage value output by the pressurizing terminal within 2 seconds continuously, and when the polarities are the same, namely the verifying terminal receives a U0 voltage value, the polarities of the current transformers are the same; when the two current transformers are different, namely the verifying end receives a voltage value of-U0, the polarities of the current transformers are opposite.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (5)
1. The utility model provides a portable current transformer polarity check gauge which characterized in that includes: a pressurizing end and a testing end; the pressurizing end is connected with one end of the line to be tested, the inspection end is connected with the other end of the line to be tested, and the pressurizing end is connected with the inspection end through wireless communication; the pressurizing end is used for inputting voltage waves to a line to be tested; the inspection end is used for receiving voltage waves in a line to be tested and displaying that the polarities of the current transformers are the same or opposite according to the fact that the polarities of the received voltage wave amplitudes are the same or opposite to the polarities of the input voltage wave amplitudes.
2. The portable current transformer polarity verifier of claim 1, wherein the pressurizing end comprises: the device comprises a power supply, a reference voltage wave generation circuit, a voltage limiting circuit, a first controller circuit, a forward addition circuit, a digital-to-analog conversion circuit, a multiplier circuit, a first wireless communication circuit and a first touch display circuit; the power supply supplies power to other circuits, and the output end of the reference voltage wave generating circuit and the output end of the voltage limiting circuit are connected to the input end of the forward addition circuit; the first controller circuit is respectively connected with the digital-to-analog conversion circuit, the first wireless communication circuit and the first touch display circuit; the output end of the digital-to-analog conversion circuit and the output end of the forward addition circuit are connected with the input end of the multiplier circuit; and the output end of the multiplier circuit is connected with a line to be tested.
3. The portable current transformer polarity verifier of claim 2, wherein the reference voltage wave generation circuit comprises: the circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a capacitor C1, a diode D1, a bidirectional voltage stabilizing diode Uz1, an operational amplifier U1 and an operational amplifier U2; the voltage limiting circuit includes: a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a bidirectional voltage stabilizing diode Uz, an operational amplifier U3 and an operational amplifier U4; the forward addition circuit includes: the circuit comprises a resistor R15, a resistor R16, a resistor R17, a resistor R18 and an operational amplifier U5; the multiplier circuit includes a multiplier U6; the digital-to-analog conversion circuit includes: the digital-to-analog converter U7, the resistor R19 and the resistor R20;
the positive input end of the operational amplifier U1 is respectively connected with one end of a resistor R1 and one end of a resistor R2, the negative input end of the operational amplifier U1 is connected with one end of a resistor R3, and the output end of the operational amplifier is connected with one end of a resistor R8; the other end of the resistor R3 is grounded; the other end of the resistor R2 is respectively connected with the other end of the resistor R8, one end of the resistor R10, one end of the resistor R9 and one end of a bidirectional voltage stabilizing diode Uz 1; the other end of the bidirectional voltage stabilizing diode Uz1 is grounded; the other end of the resistor R9 is connected with the anode of a diode D1; the cathode of the diode D1 is respectively connected with one end of the capacitor C1, one end of the resistor R10 and the cathode input end of the operational amplifier U2; the positive electrode input end of the operational amplifier U2 is connected with one end of the resistor R11; the other end of the resistor R11 is grounded; the other end of the resistor R1 is respectively connected with the other end of the capacitor C1 and one end of the resistor 15; the negative electrode input end of the operational amplifier U3 is respectively connected with one end of a resistor R9 and one end of a resistor R10, and the positive electrode input end of the operational amplifier U3 is connected with one end of a resistor R11; the other end of the resistor R9 is respectively connected with one end of the resistor R8 and one end of a bidirectional voltage stabilizing diode Uz 2; the other end of the resistor R8 is connected with a power supply Vcc; the other end of the bidirectional voltage stabilizing diode Uz2 is grounded; the other end of the resistor R11 is grounded; the positive electrode output end of the operational amplifier U3 is respectively connected with the other end of the resistor R10 and the other end of the resistor R12; the negative electrode input end of the operational amplifier U4 is respectively connected with the other end of the resistor R12 and one end of the resistor R13, and the positive electrode input end of the operational amplifier U4 is connected with one end of the resistor R14; the other end of the resistor R14 is grounded; the positive electrode output end of the operational amplifier U4 is respectively connected with the other end of the resistor R13 and one end of the resistor R16; the positive input end of the operational amplifier U5 is respectively connected with the other end of the resistor R15 and the other end of the resistor R16, and the negative input end of the operational amplifier U5 is respectively connected with one end of the resistor R17 and one end of the resistor R18; the other end of the resistor R17 is grounded, and the positive output end of the operational amplifier U5 is respectively connected with the other end of the resistor R18 and one input end of the multiplier U6; the output end of the first controller circuit is connected with the input end of the digital-to-analog converter U7; the Vcc end of the digital-to-analog converter U7 is respectively connected with a power supply Vcc and one end of a resistor R19, the VREF end of the digital-to-analog converter U7 is respectively connected with the other end of the resistor R19 and one end of the resistor R20, and the output end of the operational amplifier U7 is connected with the other input end of the multiplier U6; the other end of the resistor R20 is grounded; and the output end of the multiplier U6 is connected with a line to be tested.
4. The portable current transformer polarity verifier of claim 1, wherein the verification terminal comprises: the wireless touch display device comprises a power supply, a voltage detection circuit, a second touch display circuit, a second controller circuit and a second wireless communication circuit; the power supply supplies power to other circuits respectively; the second controller circuit is respectively connected with the output end of the voltage detection circuit, the second touch display circuit and the second wireless communication circuit; and the input end of the voltage detection circuit is connected with a line to be detected.
5. The portable current transformer polarity verifier of claim 4, wherein the voltage detection circuit comprises: a resistor 21, a capacitor C2 and a digital voltmeter V1; the anode of the line to be tested is connected with one end of the resistor R21; the other end of the resistor R21 is respectively connected with one end of a capacitor C2 and the anode of a digital voltmeter V1; the negative electrode of the circuit to be tested is respectively connected with the other end of the capacitor C2 and the negative electrode of the digital voltmeter V1; the output end of the digital voltmeter V1 is connected with the second controller circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022609299.4U CN214503873U (en) | 2020-11-12 | 2020-11-12 | Portable current transformer polarity calibrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022609299.4U CN214503873U (en) | 2020-11-12 | 2020-11-12 | Portable current transformer polarity calibrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214503873U true CN214503873U (en) | 2021-10-26 |
Family
ID=78205711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022609299.4U Active CN214503873U (en) | 2020-11-12 | 2020-11-12 | Portable current transformer polarity calibrator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214503873U (en) |
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2020
- 2020-11-12 CN CN202022609299.4U patent/CN214503873U/en active Active
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