CN206270398U - A comprehensive tester for voltage and current loops - Google Patents

Abstract

The utility model discloses a comprehensive tester for voltage and current loops, comprising: a voltage measurement loop coupled to an external secondary equipment voltage loop; a current measurement loop coupled to an external secondary equipment current loop to detect the external secondary equipment current The current value of the loop; the control circuit is coupled to the voltage measurement loop and the current measurement loop; the input adjustment circuit is used to couple with the external secondary equipment circuit, and the voltage measurement loop and the current measurement loop are connected to the external secondary equipment through the input circuit. Secondary equipment circuit coupling. The voltage and current loop comprehensive tester of the utility model can effectively detect the voltage in the voltage loop of the external secondary equipment and the current in the current loop through the setting of the voltage measurement loop and the current measurement loop. The setting of the control circuit and the input adjustment circuit can realize the effect of intelligent detection, making the detection result more accurate and more convenient to use.

Description

A comprehensive tester for voltage and current loops

technical field

The utility model relates to a detection device, in particular to a voltage and current loop comprehensive tester.

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 and current inside the secondary equipment is a multimeter. It is relatively cumbersome and needs to be continuously adjusted for detection, which greatly reduces the detection efficiency of the voltage and current of the secondary equipment.

Utility model content

Aiming at the deficiencies in the prior art, the purpose of the utility model is to provide a voltage and current loop comprehensive tester with high efficiency for voltage and current detection of secondary equipment.

In order to achieve the above purpose, the utility model provides the following technical solutions: a voltage and current loop comprehensive tester, including:

The voltage measurement circuit is coupled to the voltage circuit of the external secondary equipment to detect the voltage value of the voltage circuit of the external secondary equipment;

The current measurement loop is coupled to the current loop of the external secondary equipment to detect the current value of the current loop of the external secondary equipment;

The control circuit is coupled to the voltage measurement circuit and the current measurement circuit, so as to control the connection between the voltage measurement circuit and the current measurement circuit and the voltage circuit and the current circuit of the external secondary equipment;

The input adjustment circuit is used for coupling with an external power supply, and the voltage measurement loop and the current measurement loop are both coupled with the external power supply through the input circuit, and are used for adjusting the voltage difference between the two ends of the voltage measurement loop and the current measurement loop.

As a further improvement of the utility model, the input regulation circuit includes:

Power plug XS, the power plug XS is coupled with the external power circuit;

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 the voltage measurement circuit, and the control coil of the relay KT is coupled with the control circuit . As a further improvement of the utility model, the control circuit includes:

The AC/DC circuit 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 is coupled to the AC/DC circuit, receives the direct current output from the AC/DC circuit, and is also coupled to an output switching circuit, which is preset with a voltage loop detection mode and a current detection mode. The output switching circuit is used for Input the switching signal to the MCU microcontroller, change the internal detection mode of the MCU microcontroller, and at the same time, the MCU microcontroller outputs the driving signal;

The relay driving circuit is coupled to the control coil of the relay KT, and is also coupled to the MCU microcontroller, for receiving the driving signal output by the MCU microcontroller, and driving the output current according to the driving signal.

As a further improvement of the utility model, the voltage measurement circuit includes:

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 relay drive circuit, receives the current output by the relay drive circuit, and generates an action according to the current, the plurality of switches One end is coupled to the secondary side of the transformer T1, and the other end is respectively coupled to fuses FU1-FU4 and then coupled to an external secondary equipment voltage circuit.

A voltmeter, one end of the voltmeter is coupled to the secondary side of the transformer T1, and the other end is coupled to a voltage measurement switch, the voltage measurement switch has an input terminal and a plurality of output terminals, and the input terminal is connected to the The voltmeter is coupled to the other end connected to the transformer T1, and the multiple output ends are respectively connected to the fuses FU1-FU4 in one-to-one correspondence. There is a toggle lever between the input end and the output end. Once activated, connect the input to one of the outputs.

As a further improvement of the utility model, the current measurement loop includes:

Relay K2, one end of the switch part of the relay K2 is coupled to the secondary side of the transformer T1, the other end is coupled to the current loop of the external secondary equipment, and the control coil of the relay K2 is coupled to the relay driving circuit;

A current voltage impedance meter, the current voltage impedance meter has a detection input terminal and a power supply terminal, the detection input terminal is coupled with the current loop of the external secondary equipment, the power supply terminal is coupled with a transformer CT, and the transformer CT Mutual inductance with the connection line between the switch part of the relay K2 and the current loop of the external secondary equipment to supply power to the current voltage impedance meter.

The beneficial effect of the utility model is that through the setting of the voltage measurement circuit, the method of connecting the voltage measurement circuit with the voltage circuit of the external secondary equipment can be used to detect the voltage value of the voltage circuit of the external secondary equipment. The secondary equipment voltage loop is used for detection, and through the setting of the current measurement loop, the current measurement loop can be connected with the external secondary equipment current loop to detect the current value of the external secondary current loop, so that It can realize the function of detecting the current circuit of the secondary equipment, and through the setting of the input adjustment circuit, the voltage difference between the two ends of the voltage measurement circuit and the current measurement circuit can be adjusted at the beginning, so as to avoid the voltage measurement circuit and the voltage measurement circuit caused by the excessive voltage difference. The problem of device damage in the current measurement loop, and through the setting of the control circuit, can effectively control the effect of the tester at this time whether to detect the voltage loop or the current loop, and can achieve an intelligent measurement effect, and the entire measurement process is operated It is convenient and does not require multiple gear adjustments and wiring, thus greatly improving the detection efficiency.

Description of drawings

Fig. 1 is the circuit diagram of the voltage and current loop comprehensive tester 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 Fig. 1, a kind of voltage and current loop comprehensive tester of the present embodiment is characterized in that: comprising:

Voltage measurement loop 1, coupled to the external secondary equipment voltage loop, detects the voltage value of the external secondary equipment voltage loop;

Current measurement loop 2, coupled to the current loop of the external secondary equipment, detects the current value of the current loop of the external secondary equipment;

The control circuit 3 is coupled to the voltage measurement circuit 1 and the current measurement circuit 2, so as to control the on-off between the voltage measurement circuit 1 and the current measurement circuit 2 and the voltage circuit and the current circuit of the external secondary equipment;

The input adjustment circuit 4 is used for coupling with an external power supply, and both the voltage measurement circuit 1 and the current measurement circuit 2 are coupled with the external power supply through the input circuit 4, so as to adjust the voltage input to the voltage measurement circuit 1 and the current measurement circuit 2 When using a comprehensive tester, first connect the voltage measurement circuit 1 to the voltage circuit of the external secondary equipment, connect the current measurement circuit 2 to the current circuit of the external secondary equipment, and then connect the operation control circuit 3 Through the voltage measurement circuit 1 or the current measurement circuit 2, for example, when measuring the voltage circuit, the operation control circuit 3 connects the voltage circuit between the voltage measurement circuit 1 and the external secondary equipment, and adjusts the input adjustment circuit 4 first to input The adjustment circuit 4 is adjusted to the gear of the minimum voltage difference, so that the voltage measurement circuit 1 can effectively measure the voltage circuit of the secondary equipment. When measuring the current circuit, it is the same as above, the difference is that the control circuit 3 Connect the current measurement loop and the current loop of the external secondary equipment, so as to complete the detection of the current loop, through the above settings, the comprehensive tester can simply and conveniently detect the voltage loop and current loop, compared with the way of using a multimeter in the prior art , which is more efficient and faster to detect.

As an improved specific implementation, the input regulation circuit 4 includes:

Power plug XS, the power plug XS is coupled with the external power circuit;

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 the voltage measurement circuit, the control coil of the relay KT is coupled with the control circuit 3 It can be well connected to the external power supply through the power plug XS, 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 The problem that the internal devices of the voltage measurement circuit 1 and the current measurement circuit 2 are burned out.

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

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

The relay driving circuit 33 is coupled to the control coil of the relay KT, and is also coupled to the MCU microcontroller 32, for receiving the driving signal output by the MCU microcontroller 32, and driving the output current according to the driving signal, through the AC/DC circuit 31, the AC power input by the external power supply can be converted into DC power for the MCU to supply power to the controller 32, and through the setting of the output switching circuit 321, people can input operation signals to the MCU microcontroller 32, and use the MCU micro-controller The output signal of the device 32 is used to control the test of the comprehensive tester, so the output switching circuit 321 of this embodiment can be a switch, a button, etc., and the detection mode of the MCU microcontroller 32 can be effectively realized in the voltage mode by using the switch in the switching function. And the current mode can be freely switched, and through the setting of the relay driving circuit 33, 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 voltage measurement circuit 1 includes:

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 with the relay drive circuit 33, receives the current output by the relay drive circuit 33, and generates an action according to the current. One end of the switch is coupled to the secondary side of the transformer T1, and the other end is respectively coupled to the fuses FU1-FU4 and then coupled to the external secondary equipment voltage circuit.

A voltmeter 11, one end of the voltmeter 11 is coupled to the secondary side of the transformer T1, and the other end is coupled to a voltage measurement switch 12, the voltage measurement switch 12 has an input terminal and a plurality of output terminals, so The input end is coupled to the other end of the voltmeter 11 that is connected to the transformer T1, 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, and through the setting of the voltmeter 11, the effect of detecting the voltage circuit of the external secondary equipment can be realized, and through the setting of the relay K1 and the voltage measurement switch 12 , the voltages of different circuits can be connected to the voltmeter, and the detection effect of multi-phase circuit voltage is realized. In this embodiment, the voltages of four-phase circuits can be detected, which are A phase, B phase, C phase and L phase respectively, realizing A voltmeter 11 detects the effect of the voltage in the multi-phase circuit, and the voltmeter 11 can be further protected by setting the fuses FU1-FU4.

As an improved specific implementation, the current measurement loop 2 includes:

Relay K2, one end of the switch part of the relay K2 is coupled to the secondary side of the transformer T1, and the other end is coupled to the current loop of the external secondary equipment, and the control coil of the relay K2 is coupled to the relay drive circuit 33;

A current voltage impedance meter 21, the current voltage impedance meter 21 has a detection input terminal and a power supply terminal, the detection input terminal is coupled with the current loop of the external secondary equipment, the power supply terminal is coupled with a transformer CT, and the mutual inductance The mutual inductance of the connection line between the switch part of the transformer CT and the relay K2 and the current loop of the external secondary equipment is used to supply power to the current voltage impedance meter 21. Through the setting of the relay K2, the effect of controlling whether the current passes through the current voltage impedance meter can be realized. In this way, the effect of the control circuit 3 controlling whether the tester detects the current loop of the secondary equipment is realized.

In summary, the voltage and current loop comprehensive tester of this embodiment can measure the voltage loop of the secondary equipment through the setting of the voltage measurement loop 1, and can measure the current loop of the secondary equipment through the setting of the current measurement loop 2. The setting of the input regulation circuit 4 can avoid the problem of internal device damage caused by the voltage difference between the two ends of the voltage measurement circuit 1 and the current measurement circuit 2 being too high, and through the setting of the control circuit 3, intelligent detection can be realized, making the comprehensive tester It is more efficient and more convenient to use.

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 kind of voltage x current loop comprehensive tester, it is characterised in that：Including：

Voltage measurement circuit (1), is coupled to external secondary equipment voltage circuit, detects the voltage of external secondary equipment voltage circuit Value；

Current measurement circuit (2), is coupled to external secondary device current loop, the electric current in detection external secondary device current loop Value；

Control circuit (3), is coupled to voltage measurement circuit (1) and current measurement circuit (2), with control voltage measuring loop (1) And the break-make between current measurement circuit (2) and the voltage circuit and current loop of external secondary equipment；

Input conditioning circuit (4), for being coupled with external power source, the voltage measurement circuit (1) and current measurement circuit (2) are Coupled by input circuit (4) and external power source, be used to adjust and be input to voltage measurement circuit (1) and current measurement circuit (2) Both end voltage it is poor.

2. voltage x current loop according to claim 1 comprehensive tester, it is characterised in that：The input conditioning circuit (4) include：

Attaching plug XS, attaching plug XS are coupled with external power source loop；

Variometer TY, variometer TY has first end, the second end and adjustable side, and the first end is coupled with fusing Coupled with attaching plug XS after power switch S1 is coupled with after device FU0, second end is coupled to after being coupled to power switch S1 Attaching plug XS；

The primary side of transformer T1, transformer T1 is coupled with after relay KT the adjustable side for being coupled to variometer TY, two Secondary side couples with voltage measurement circuit, control coil and control circuit (3) coupling of the relay KT.

3. voltage x current loop according to claim 2 comprehensive tester, it is characterised in that：Control circuit (3) bag Include：

AC/DC circuits (31), are coupled to the other ends of the fuse FU0 relative to power switch S1, will be passed through overcurrent fuse FU0 The defeated alternating current for coming is exported after being converted into direct current；

MCU microcontrollers (32), are coupled to AC/DC circuits (31), receive the direct current of AC/DC circuits (31) outputs, are also coupled to There is output switching circuit (321), voltage circuit detection pattern and amperometric detection mode, the output switching circuit are preset with it (321) for being input into, switching signal is interior to MCU microcontrollers (32), changes the detection pattern of the inside of MCU microcontrollers (32), While MCU microcontrollers (32) output drive signal；

Relay drive circuit (33), is coupled to the control coil of relay KT, is further coupled to MCU microcontrollers (32), is used for The drive signal of MCU microcontrollers (32) outputs is received, and output current is driven according to drive signal.

4. voltage x current loop according to claim 3 comprehensive tester, it is characterised in that：The voltage measurement circuit (1) include：

Control relay K1, control relay K1 include control coil and multiple switch, the control of the control relay K1 Coil is coupled with relay drive circuit (33), the electric current of receiving relay drive circuit (33) output, is produced according to electric current dynamic Make, one end of the multiple switch is coupled to the secondary side of transformer T1, and the other end has been respectively coupled to fuse FU1~FU4 After be coupled to external secondary equipment voltage circuit;

Voltmeter (11), one end of the voltmeter (11) is coupled to the secondary side of transformer T1, and the other end is coupled with voltage survey Amount switching switch (12), voltage measurement switching switch (12) is with an input and multiple output ends, the input With voltmeter (11) relative to be connected with transformer T1 the other end coupling, multiple output ends respectively with fuse FU1~FU4 mono- One correspondence connection, is provided with a poke rod, after poke rod is stirred, by input and wherein between the input and output end Individual output end connection.

5. the voltage x current loop comprehensive tester according to claim 3 or 4, it is characterised in that：The current measurement is returned Road (2) includes：

The secondary side coupling of switch sections one end and transformer T1 of relay K2, relay K2, the other end and external secondary Device current loop is coupled, and control coil and the relay drive circuit (33) of the relay K2 are coupled；

Current Voltage impedance meter (21), the Current Voltage impedance meter (21) is with detection input and power end, and the detection is defeated Enter end to be coupled with the current loop of external secondary equipment, the power end is coupled with transformer CT, the transformer CT and relay Connection line mutual inductance between device K2 switch sections and external secondary device current loop, supplies with to Current Voltage impedance meter (21) Electricity.