CN206270399U - A voltage loop test circuit - Google Patents

Abstract

The utility model discloses a voltage loop test circuit, which comprises a box body and a power loop, the power loop is arranged in the box body, and the power loop includes: a voltage loop output terminal for coupling with a voltage loop of an external secondary device connected; the input adjustment unit is used to couple with the external power supply, the control unit is coupled to the input adjustment unit; the control relay K1, the voltmeter, one end of the voltmeter is coupled to the output terminal of the voltage loop, and the other end is coupled to the Voltage measurement toggle switch. The voltage loop test circuit of the utility model can avoid the problem of overvoltage damage to the voltmeter when it is just turned on through the setting of the input adjustment unit, and can realize intelligent voltage measurement through the setting of the control relay K1 and the control unit, and through the voltage The setting of the measurement switch can realize the voltage measurement of different phase units by switching, so compared with the method of multimeter, the detection is more convenient and quicker.

Description

A voltage loop test circuit

technical field

The utility model relates to a test circuit, in particular to a voltage loop test circuit.

Background technique

During the operation and maintenance of the power grid, it is often necessary to detect the voltage and current of the middle circuit of the power grid. Therefore, when the existing power grid is running, some secondary equipment is used to monitor the voltage and current of the power grid. Perform inspections for maintenance and troubleshooting of the grid.

However, during the long-term operation of the power grid, some secondary equipment failures will occur, making it impossible for the secondary equipment to detect the voltage and current of the power grid well, so it is necessary to detect the failure of the secondary equipment Exclude, in the process of exclusion, first of all, it is necessary to detect the voltage and current inside the secondary equipment. In the prior art, the tool used to detect the voltage inside the secondary equipment is a multimeter, and it is more cumbersome to use a multimeter to detect , It needs to be continuously adjusted and re-wired for detection, which greatly reduces the detection efficiency of the secondary equipment voltage.

Utility model content

Aiming at the deficiencies in the prior art, the purpose of the utility model is to provide a voltage loop test circuit with high voltage detection efficiency.

In order to achieve the above purpose, the utility model provides the following technical solutions: a voltage loop test circuit, including a box and a power loop, the power loop is arranged in the box, and the power loop includes:

Voltage loop output terminal, used for coupling with the voltage loop of external secondary equipment;

The input adjustment unit is used for coupling with an external power supply to adjust the voltage difference between the two ends of the power circuit;

A control unit, coupled to the input adjustment unit, for interacting with people and outputting control signals;

Control relay K1, the control relay K1 includes a control coil and a plurality of switches, the control coil of the control relay K1 is coupled to the control unit, receives the control signal output by the control unit, and generates an action according to the control signal, the plurality of switches One end is coupled to the input adjustment unit, and the other end is respectively coupled to fuses FU1-FU4 and then coupled to the output terminal of the voltage loop;

A measuring unit, the measuring unit includes a voltmeter, one end of the voltmeter is coupled to the output terminal of the voltage loop, and the other end is coupled to a voltage measurement switch, and the voltage measurement switch has an input terminal and a plurality of output terminals, The input end is coupled to the other end of the voltmeter connected to the input adjustment unit, and the multiple output ends are respectively connected to the fuses FU1-FU4 in one-to-one correspondence, and a toggle lever is provided between the input end and the output end , when the toggle lever is toggled, connect the input end to one of the output ends.

As a further improvement of the utility model, the box body is provided with a box cover, the voltage loop output terminal and the voltmeter are both arranged on the box cover, and the voltage loop output terminal is set at a position close to the upper left of the box cover Above, the fuses FU1~FU4 are embedded on the box cover below the output terminals of the voltage loop, the voltmeter is set on the box cover below the fuses FU1~FU4, and the voltage The measurement switching switch is set on the lower position of the cover relative to the voltmeter, and is arranged in a straight line with the output terminals of the voltage loop, fuses FU1-FU4 and the voltmeter.

As a further improvement of the utility model, the input adjustment unit includes:

Power plug XS, the power plug XS is coupled with an external power supply;

A variable inductor TY, the variable inductor TY has a first end, a second end and an adjustment end, the first end is coupled with a fuse FU0, coupled with a power switch S1, and coupled with a power plug XS connected, the second end is coupled to the power switch S1 and then coupled to the power plug XS;

Transformer T1, the primary side of the transformer T1 is coupled with the relay KT and then coupled to the adjustment terminal of the variable inductor TY, the secondary side is coupled with multiple switches of the control relay K1, the control coil of the relay KT is connected to the control unit coupling;

Wherein, the power plug XS, the power switch S1 and the fuse FU0 are arranged side by side on the lower side of the case cover relative to the voltage measurement switch, and the variable inductance TY is arranged on the lower right side of the case cover. As a further improvement of the utility model, the control unit includes:

The AC/DC unit is coupled to the other end of the fuse FU0 relative to the power switch S1, so as to convert the alternating current transmitted through the fuse FU0 into direct current and then output it;

The MCU microcontroller, coupled to the AC/DC unit, receives the direct current output from the AC/DC unit, and is also coupled to an output switching unit, which is preset with a voltage loop detection mode and a current detection mode, and the output switching unit is used for When the input signal enters the MCU microcontroller, the MCU microcontroller outputs the driving signal; the relay drive unit is coupled to the control coil of the relay KT and the control relay K1, and is also coupled to the MCU microcontroller for receiving the MCU microcontroller. The controller outputs the driving signal, and drives the output current according to the driving signal, and drives the relay KT and the control relay K1 to act.

As a further improvement of the present utility model, the output switching unit includes an output button and a cut-off button, the output button is used for outputting a voltage output signal, and the cut-off button is used for outputting a cut-off signal, and both the output button and the cut-off button are connected with the MCU microcontroller Coupling, when the output button is pressed to output a voltage output signal, the MCU controller receives the signal, and sends a drive signal to the relay drive unit to control the relay KT and relay K1 to close, and turn on the power plug XS and the voltage loop output terminal, when When the cut-off button is pressed, the MCU controller receives the signal and sends a drive signal to the relay drive unit to control the relay KT and relay K1 to open, disconnect the power plug XS and the output terminal of the voltage loop, where the output button and the cut-off button are side by side Set to the left of the variable inductor TY.

The beneficial effect of the utility model is that through the setting of the box body, the power circuit can be effectively protected to ensure that the power circuit can work well during the measurement process, and through the setting of the output terminal of the voltage circuit, it can be effectively connected with the The voltage loop coupling of the external secondary equipment is convenient for wiring, and an intelligent measurement effect can be realized by controlling the relay K1 and the control unit. Compared with the way that the multimeter is not connected through the multimeter, it greatly facilitates the next measurement, and through the setting of the voltmeter, the measurement of the voltage circuit can be effectively completed, and through the setting of the voltage measurement switch, it can be aimed at secondary equipment. The voltage circuit of each phase in the multi-phase circuit is measured without rewiring, which is faster and faster than the multimeter method.

Description of drawings

Fig. 1 is the structural diagram of the box cover of the voltage loop test circuit of the present utility model;

FIG. 2 is a circuit diagram of the power loop of the voltage loop test circuit of the present invention.

detailed description

The utility model will be described in further detail below in conjunction with the embodiments provided by the accompanying drawings.

Referring to Figures 1 to 2, a voltage loop test circuit of this embodiment includes a box body and a power loop, the power loop is arranged in the box body, and the power loop includes:

Voltage loop output terminal 2, used for coupling with the voltage loop of external secondary equipment;

The input adjustment unit 4 is used for coupling with an external power supply to adjust the voltage difference between the two ends of the power circuit;

The control unit 3, coupled to the input adjustment unit 4, is used for interacting with people and outputting control signals;

Control relay K1, the control relay K1 includes a control coil and a plurality of switches, the control coil of the control relay K1 is coupled to the control unit 3, receives the control signal output by the control unit 3, and generates an action according to the control signal, the plurality of One end of the switch is coupled to the input adjustment unit 4, and the other end is respectively coupled to fuses FU1-FU4 and then coupled to the output terminal 2 of the voltage loop;

Measuring unit 1, the measuring unit 1 includes a voltmeter 11, one end of the voltmeter 11 is coupled to the voltage loop output terminal 2, and the other end is coupled to a voltage measurement switch 12, and the voltage measurement switch 12 has an input terminal and a plurality of output terminals, the input terminal is coupled to the other end of the voltmeter 11 relative to the input adjustment unit 4, and the multiple output terminals are respectively connected to the fuses FU1-FU4 in one-to-one correspondence, and the input terminal is connected to the There is a toggle lever between the output terminals. When the toggle lever is toggled, the input terminal is connected to one of the output terminals. In the process of measuring the voltage, first connect the output terminal 2 of the voltage loop to each The voltage loops of the phases are connected one by one, and then the input adjustment unit 4 is adjusted to the position where the voltage difference is the largest, and then the control unit 3 is operated, and the control unit 3 drives the control relay K1 to close, and the voltmeter 11, the input adjustment loop 4 and The voltage loop output terminal 2 is turned on, and the voltmeter 11 can effectively measure the voltage loop at this time. When it is necessary to change the phase of the detected voltage loop, you only need to move the toggle lever, and the conduction will be changed. The input terminal and the output terminal, that is to say, the output terminal after switching is connected to the circuit corresponding to the voltage circuit of a phase, so that the voltmeter can detect the voltage of the voltage circuit of the phase, so that the voltage circuit of the external secondary equipment can be effectively completed. The comprehensive detection process is simple and fast, and compared with the method of using a multimeter in the prior art, the efficiency is higher.

As an improved specific implementation, the box body is provided with a box cover 5, the voltage loop output terminal 2 and the voltmeter 11 are both arranged on the box cover 5, and the voltage loop output terminal 2 is set on the box cover 5 Near the upper left position, the fuses FU1 to FU4 are embedded on the box cover 5 below the output terminal 2 of the voltage loop, and the voltmeter 11 is set on the box cover 5 relative to the fuses At the lower position of FU1-FU4, the voltage measurement switching switch 12 is arranged on the lower position of the case cover 5 relative to the voltmeter 11, and is arranged in a straight line with the output terminal 2 of the voltage circuit, the fuses FU1-FU4, and the voltmeter 11. Since the output terminal 2 of the voltage loop, the voltmeter 11, the fuses FU1~FU4, and the voltage measurement switch 12 are all connected to each other, arranging them in a straight line can facilitate the connection of the wires and avoid excessive crossover of the connecting wires. It is a complicated problem, and the output terminal 2 of the voltage loop is set at the side of the box cover, which can facilitate people's wiring, and the fuses FU1~FU4 are embedded to facilitate the replacement of the fuses in the later stage.

As an improved specific implementation, the input adjustment unit 4 includes:

Power plug XS, the power plug XS is coupled with an external power supply;

A variable inductor TY, the variable inductor TY has a first end, a second end and an adjustment end, the first end is coupled with a fuse FU0, coupled with a power switch S1, and coupled with a power plug XS connected, the second end is coupled to the power switch S1 and then coupled to the power plug XS;

Transformer T1, the primary side of the transformer T1 is coupled with the relay KT and then coupled to the adjustment terminal of the variable inductor TY, the secondary side is coupled with multiple switches of the control relay K1, the control coil of the relay KT is connected to the The control unit 3 is coupled;

Wherein, the power plug XS, the power switch S1 and the fuse FU0 are arranged side by side on the lower position of the case cover 5 relative to the voltage measurement switch 12, and the variable inductance TY is arranged at the lower right position of the case cover 5 On, the power plug XS can be well connected to the external power supply, so that the external power supply can input a stable voltage to the comprehensive tester, and then through the function of the variable inductor TY and the transformer T1, the voltage measurement circuit 1 and the current measurement circuit 2 Output a reference voltage, since the input of the external power supply is AC, so the setting of the variable inductor TY can effectively adjust the voltage input to the primary side of the transformer T1, then the voltage of the primary side of the transformer T1 changes , naturally the voltage on the secondary side will also change, so the effect of changing the voltage difference between the voltage measurement circuit 1 and the current measurement circuit 2 can be effectively realized, and it is very good to avoid the excessive input voltage at the beginning As a result of the burning problem of the voltmeter 11, the power plug XS and the power switch S1 are arranged side by side to facilitate the connection between the two, and the power plug XS and the power switch S1 are set at the lower position of the voltage measurement switch 12 On, and then facilitate the connection between the variable inductor TY.

As an improved specific implementation, the control unit 3 includes:

The AC/DC unit 31 is coupled to the other end of the fuse FU0 relative to the power switch S1, so as to convert the alternating current transmitted through the fuse FU0 into direct current and then output it;

The MCU microcontroller 32 is coupled to the AC/DC unit 31, receives the direct current output by the AC/DC unit 31, and is also coupled to the output switching unit 321, which is preset with a voltage loop detection mode and a current detection mode. The output switching unit 321 is used to input signals into the MCU microcontroller 32 to change the internal detection mode of the MCU microcontroller 32, and the MCU microcontroller 32 outputs the driving signal;

The relay driving unit 33 is coupled to the control coil of the relay KT and the control relay K1, and is also coupled to the MCU microcontroller 32, for receiving the drive signal output by the MCU microcontroller 32, and driving the output current according to the drive signal, driving The relay KT and the control relay K1 act, and through the setting of the AC/DC circuit 31, the alternating current input by the external power supply can be converted into direct current to supply power to the MCU for the controller 32, and through the setting of the output switching circuit 321, people can give The MCU micro-controller 32 inputs the operation signal, utilizes the MCU micro-controller 32 output signals to control the test of the voltage loop test circuit, so the output switching circuit 321 of the present embodiment can be a switch, a button, etc., and through the relay drive circuit 33 setting, the signal output by the MCU microcontroller 32 can be converted into a current to control the relay, so that the control function of the control circuit 3 can be effectively realized.

As an improved specific implementation, the output switching unit 321 includes an output button 3212 and a cut button 3213. The output button 3212 is used to output a voltage output signal, and the cut button 3213 is used to output a cut signal. The output button 3212 and cut button The buttons 3213 are all coupled to the MCU microcontroller 32. When the output button 3212 is pressed to output a voltage output signal, the MCU controller 32 receives the signal and sends a drive signal to the relay drive unit 33 to control the relay KT and the relay K1 to be closed. Turn on the power plug XS and the voltage loop output terminal 2. When the cut-off button 3213 is pressed, the MCU controller 32 receives the signal and sends a drive signal to the relay drive unit 33 to control the relay KT and relay K1 to open, and disconnect the power plug XS With the voltage loop output terminal 2, wherein the output button 3212 and the cut-off button 3213 are arranged side by side on the left side of the variable inductor TY, the output switching unit 321 is set as the output button 3212 and the cut-off button 3213, through the output button 3212 The setting of the power circuit can detect whether the power circuit can work normally, and through the setting of the cut button 3213, the power circuit can be disconnected from the external voltage circuit when it is inconvenient to measure the external voltage circuit, and then the output can be used when it is convenient to measure. The button 3212 conducts the two to realize the measurement of the current.

To sum up, the voltage loop measurement circuit of this embodiment can be effectively connected to the voltage loop of the external secondary equipment through the voltage loop output terminal 2, and through the setting of the input adjustment unit 4, it is possible to avoid excessive voltage during conduction. The voltmeter 11 is damaged, and through the setting of the voltage measurement switch 12, the effect of separately measuring the multi-phase voltage circuit can be realized, and a comprehensive detection can be realized. Compared with the existing multimeter method, the test process is more intelligent. , more convenient and quick.

The above descriptions are only preferred implementations of the present utility model, and the protection scope of the present utility model is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present utility model all belong to the protection scope of the present utility model. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims (5)

1. A voltage loop test circuit, characterized in that: comprise a casing and a power loop, the power loop is arranged in the casing, and the power loop includes: Voltage loop output terminal (2), used for coupling with the voltage loop of external secondary equipment; The input adjustment unit (4) is used for coupling with an external power supply to adjust the voltage difference between the two ends of the power circuit; The control unit (3), coupled to the input adjustment unit (4), is used for interacting with people and outputting control signals; Control relay K1, the control relay K1 includes a control coil and a plurality of switches, the control coil of the control relay K1 is coupled to the control unit (3), receives the control signal output by the control unit (3), and generates an action according to the control signal, One end of the plurality of switches is coupled to the input adjustment unit (4), and the other end is respectively coupled to fuses FU1-FU4 and then coupled to the voltage loop output terminal (2); A measuring unit (1), the measuring unit (1) comprising a voltmeter (11), one end of the voltmeter (11) is coupled to the voltage loop output terminal (2), and the other end is coupled to a voltage measurement switch (12 ), the voltage measurement changeover switch (12) has an input terminal and a plurality of output terminals, and the input terminal is coupled with the voltmeter (11) relative to the other end connected with the input adjustment unit (4), and the multiple output terminals The terminals are respectively connected to the fuses FU1-FU4 in one-to-one correspondence. A toggle lever is provided between the input terminal and the output terminal. When the toggle lever is toggled, the input terminal is connected to one of the output terminals. 2. The voltage loop test circuit according to claim 1, characterized in that: the box body is provided with a box cover (5), and the voltage loop output terminal (2) and the voltmeter (11) are all arranged in the box On the cover (5), the voltage loop output terminal (2) is set on the upper left position of the box cover (5), and the fuses FU1-FU4 are embedded in the box cover (5) relative to the voltage loop At the lower position of the output terminal (2), the voltmeter (11) is arranged on the lower position of the case cover (5) relative to the fuses FU1-FU4, and the voltage measurement switching switch (12) is arranged on the case cover (5) On the lower position relative to the voltmeter (11), it is arranged in a straight line with the voltage loop output terminal (2), fuses FU1-FU4, and the voltmeter (11). 3. The voltage loop test circuit according to claim 2, characterized in that: the input adjustment unit (4) comprises: Power plug XS, the power plug XS is coupled with an external power supply; A variable inductor TY, the variable inductor TY has a first end, a second end and an adjustment end, the first end is coupled with a fuse FU0, coupled with a power switch S1, and coupled with a power plug XS connected, the second end is coupled to the power switch S1 and then coupled to the power plug XS; Transformer T1, the primary side of the transformer T1 is coupled with the relay KT and then coupled to the adjustment terminal of the variable inductor TY, the secondary side is coupled with multiple switches of the control relay K1, the control coil of the relay KT is connected to the The control unit (3) is coupled; Wherein, the power plug XS, the power switch S1 and the fuse FU0 are side by side arranged on the lower position of the case cover (5) relative to the voltage measurement switch (12), and the variable inductance TY is arranged on the case cover ( 5) On the lower right position. 4. The voltage loop test circuit according to claim 3, characterized in that: the control unit (3) comprises: AC/DC unit (31), coupled to the other end of the fuse FU0 relative to the power switch S1, to convert the alternating current transmitted through the fuse FU0 into direct current and output it; The MCU microcontroller (32), coupled to the AC/DC unit (31), receives the direct current output by the AC/DC unit (31), and is also coupled to the output switching unit (321), which is preset with a voltage loop detection mode and current detection mode, the output switching unit (321) is used to input signals into the MCU microcontroller (32), so that the MCU microcontroller (32) outputs the drive signal; Relay drive unit (33), is coupled to the control coil of relay KT and control relay K1, is also coupled to MCU microcontroller (32), is used to receive the drive signal that MCU microcontroller (32) outputs, and according to drive The signal drives the output current, drives the relay KT and controls the action of the relay K1. 5. The voltage loop test circuit according to claim 4, characterized in that: the output switching unit (321) includes an output button (3212) and a cut button (3213), and the output button (3212) is used to output the voltage output signal , the cut-off button (3213) is used to output the cut-off signal, and both the output button (3212) and the cut-off button (3213) are coupled with the MCU microcontroller (32), when the output button (3212) is pressed to output the voltage output signal , the MCU controller (32) receives the signal, and sends a driving signal to the relay drive unit (33) to control the relay KT and the relay K1 to close, and to conduct the power plug XS and the voltage loop output terminal (2), when the cut-off button is pressed (3213), the MCU controller (32) receives the signal, and sends a driving signal to the relay drive unit (33) to control the relay KT and the relay K1 to open, disconnect the power plug XS and the voltage loop output terminal (2), wherein, The output button (3212) and the cut button (3213) are arranged side by side on the left side of the variable inductor TY.