CN105353335B - A kind of AC potentiometer automatic check device and method - Google Patents

Abstract

An automatic calibration device for an AC voltage divider, including an industrial computer system connected in sequence, a broadband high-stable power supply, an intermediate frequency step-up transformer, a standard broadband voltage divider, and the standard broadband voltage divider is used for parallel connection with the AC voltage divider to be tested . The industrial computer system is used to send control signals to control the frequency and amplitude of the output voltage of the broadband high-stable power supply according to the preset voltage detection point, to sample the voltage of the standard broadband voltage divider, and to use feedback automatic control to adjust the standard broadband voltage divider The error between the voltage at the high-voltage end and the target set voltage, when the voltage at the high-voltage end of the standard broadband voltage divider reaches the preset voltage detection point, the boost will automatically stop; the intermediate frequency step-up transformer is used to boost the output voltage of the broadband high-stable power supply Then output to the standard broadband voltage divider and the AC voltage divider to be tested. The invention has stable output voltage, small waveform distortion rate, and small frequency deviation, which can avoid reading changes of resistive-capacitive voltage dividers caused by voltage quality problems. The entire detection and calibration process is fully automatic, and manual or mechanical voltage regulation can be avoided. Process operation error.

Description

An automatic calibration device and method for an AC voltage divider

technical field

The invention relates to the technical field of automatic calibration of high-voltage metering equipment in a power system, in particular to an automatic calibration device and method for an AC voltage divider.

Background technique

AC voltage divider and other high-voltage metering equipment need to compare their readings with standard metering equipment during metering calibration. High voltage, the power capacity required at this time is very large, usually only the mains plus voltage regulator or inverter power supply can be used as the input power of the intermediate frequency step-up transformer to boost the voltage. The mains fluctuates greatly and the waveform distortion rate may be relatively high, and there is a certain fluctuation in frequency, which causes the readings of the standard metering equipment to jump all the time during calibration, and because of the influence of frequency and waveform distortion rate, There are also certain errors in the standard metering equipment used as a reference, and the mains plus voltage regulating transformer can only be calibrated against the 50Hz power frequency voltage divider; when the inverter power supply is used as the power supply of the intermediate frequency step-up transformer, the output The distortion rate of the waveform is high, and there are a large number of high-frequency interference components. The high-frequency interference will seriously affect the reading of the voltage divider, causing fluctuations and zero drift in the reading of the tested AC voltage divider.

Contents of the invention

Aiming at the above-mentioned deficiencies of the prior art, the present invention provides an automatic calibration device and method for an AC voltage divider, which can realize automatic step-up, step-down, and voltage stabilization during the calibration process, the calibration frequency is from 30Hz to 300Hz, and output during calibration The voltage is very stable and the harmonic content is extremely low. The frequency and waveform distortion rate are very small during the entire boosting process, so that the reading of the resistive-capacitive voltage divider caused by frequency changes can be avoided. The entire detection and calibration process is fully automatic, which can Avoid manual or mechanical pressure regulation operation errors.

An automatic calibration device for an AC voltage divider, including an industrial computer system connected in sequence, a broadband high-stable power supply, an intermediate frequency step-up transformer, a standard broadband voltage divider, and the standard broadband voltage divider is used for parallel connection with the AC voltage divider to be tested ;

The industrial computer system is used to send a control signal to control the frequency and amplitude of the output voltage of the broadband high-stable power supply according to the preset voltage detection point, to perform voltage sampling on the standard broadband voltage divider, and to adjust the standard broadband by using feedback automatic control. The error between the voltage at the high-voltage end of the voltage divider and the target set voltage, when the voltage at the high-voltage end of the standard broadband voltage divider reaches the preset voltage detection point, the boost will be automatically stopped;

The broadband high-stable power supply includes a controller, a standard signal generator, a high-power switching power supply, a linear power amplification module, and an output filter. The controller is used to receive the control signal sent by the industrial computer system, and convert the control signal to Send it into a standard signal generator to generate a standard sine wave. The linear power amplification module includes 8 parallel power amplification modules and an isolation transformer connected in series with the output of each power amplification module. The standard sinusoidal voltage generated by the standard signal generator After being amplified by 8 power amplifier modules, it becomes 8 groups of linear power amplified AC voltage signals, and then cascades through the output of the isolation transformer to generate an AC voltage of 0-400V. After filtering by the output filter, the output voltage of the broadband high-stable power supply is obtained;

The intermediate frequency step-up transformer is used to boost the output voltage of the broadband high-stable power supply and output it to the standard broadband voltage divider and the AC voltage divider to be tested.

In the AC voltage divider automatic calibration device described above, the broadband high-stable power supply also includes a high-power switching power supply, which is used to connect to the mains through an AC contactor and a circuit breaker to generate 8 groups of positive and negative 70V DC voltages, respectively Supply power to 8 power amplifier modules of the linear power amplifier module.

In the automatic calibration device for the AC voltage divider described above, the broadband high-stable power supply also includes an overcurrent protection circuit, a temperature sensor installed on the linear power amplifier module, and the output filter is connected to the overcurrent protection circuit. The over-detection signal output terminal and temperature sensor in the circuit are connected to the controller. When the over-current protection circuit detects that the output current is overloaded or the temperature sensor detects that the temperature is over-limited, the controller sends a fault protection command to the remote industrial computer system to cut off the linear power Amplify the power supply of the module.

The automatic calibration device for the AC voltage divider as described above, the industrial computer system includes an industrial computer, a data acquisition and control circuit, and an AC contactor control coil provided on the AC contactor, and the data acquisition and control circuit is connected to the industrial computer , the AC contactor control coil is connected to the data acquisition and control circuit. After receiving the fault protection command from the broadband high-stable power supply, the industrial computer controls the AC contactor control coil through the data acquisition and control circuit to disconnect the AC contactor to cut off Mains power supply.

In the automatic calibration device for the AC voltage divider as described above, the industrial computer system also includes a display connected to the industrial computer, and the data acquisition and control circuit is also used to receive the voltage at the high voltage end of the standard broadband voltage divider and the broadband The output current and voltage signals of the high-stable power supply are displayed on the monitor.

An automatic calibration method for an AC voltage divider, which uses the above-mentioned automatic calibration device for an AC voltage divider to perform the following steps:

Step 1. Preset the voltage detection point in the industrial computer system, connect the AC voltage divider to be inspected in parallel with the standard broadband voltage divider, and connect the AC voltage divider to be inspected to the digital voltmeter at the same time;

Step 2. The industrial computer system sends a control signal to control the frequency and amplitude of the output voltage of the broadband high-stable power supply according to the preset voltage detection point. The standard broadband voltage divider collects the actual output high voltage value and sends it to the industrial computer system. After comparing the fixed target voltage, the industrial computer system uses the difference as a control signal to adjust the broadband regulated power supply, so that the error between the target voltage and the actual output voltage is the smallest. When the voltage at the high voltage end of the standard broadband voltage divider reaches the preset Automatically stop boosting when the voltage detection point is fixed;

Step 3. Record the standard voltage value displayed by the industrial computer system and the reading of the AC voltage divider to be inspected displayed by the digital voltmeter. After comparison, check and evaluate the voltage of the AC voltage divider to be inspected, and then return to step 2 until all Calibration of voltage points.

In the automatic verification method of the AC voltage divider described above, after the controller of the broadband high-stable power supply in step 2 receives the control signal sent by the industrial computer system, the control signal is sent to the standard signal generator to generate Standard sine wave, the standard sine voltage generated by the standard signal generator is amplified by 8 power amplification modules to become 8 groups of linear power amplified AC voltage signals, and then cascaded through the output of the isolation transformer to generate an AC voltage of 0-400V. After filtering by the filter, the output voltage of the broadband high-stable power supply is obtained.

In the AC voltage divider automatic calibration method described above, when the overcurrent protection circuit in the broadband high stability power supply detects that the output current is overloaded or the temperature sensor detects that the temperature exceeds the limit, the controller sends a fault protection command to the remote industrial computer system To cut off the power supply of the linear power amplifier module.

According to the automatic calibration method of the AC voltage divider described above, after the industrial computer system receives the fault protection command issued by the broadband high-stable power supply, the industrial computer controls the AC contactor control coil through the data acquisition and control circuit to switch the AC contactor Disconnect to cut off utility power.

The beneficial effects of the present invention are:

1. The traditional inspection method is based on the mains connected to the voltage regulator and the intermediate frequency step-up transformer for boosting. Since the frequency of the mains is 50Hz (frequency deviation ±0.2Hz), it affects the ratio of the resistance-capacitance divider and produces measurement errors, and can only be tested for power frequency transformers (50Hz), and cannot be tested for the different frequency characteristics of broadband voltage dividers; The frequency range of the output voltage is 30-300Hz, and the error of the output frequency is less than 0.01Hz, which can realize the inspection of different frequency characteristics of the broadband voltage divider.

2. The traditional inspection method is to use the mains as the power supply to connect the voltage regulator and the intermediate frequency step-up transformer to boost the voltage. The mains fluctuation is large (380/220V line rated voltage allowable deviation ±7%), and the waveform distortion rate is high (not greater than 5%), the standard AC voltage divider reading will jump accordingly. If the nominal accuracy of the tested AC voltage divider is high (1%, 0.5% or higher), accurate measurement cannot be performed; the test method of this device is based on the wide-band high-stable power supply connected to the intermediate frequency step-up transformer for boosting, and the wide-band high The output voltage of the stabilized power supply is amplified based on a linear power amplifier, and the waveform distortion rate and high-frequency component content of the output signal are extremely low, so that the AC voltage driving the intermediate frequency step-up transformer can be very stable, and the output sine wave waveform distortion rate is less than 1 %, the output sinusoidal voltage fluctuation and flicker are less than 0.1%.

3. The traditional inspection method is manual or mechanical voltage adjustment, the accuracy of voltage adjustment is not high, and there may be operational errors in manual voltage adjustment; this device realizes automatic boosting, stepping down and voltage stabilization during the inspection process, and realizes automatic reading and recording of standard AC points. Voltage indication, automatic generation of test reports, automatic detection of resonance and self-adaptive adjustment of the step size, to avoid manual or mechanical voltage regulation operation errors.

Description of drawings

Fig. 1 is the working principle diagram of the automatic calibration device of AC voltage divider of the present invention;

Fig. 2 is the schematic diagram of the circuit structure of the broadband high stability power supply in the present invention;

Fig. 3 is a schematic diagram of the circuit structure of the linear power amplification module in Fig. 2;

Fig. 4 is the internal functional block diagram of industrial computer system in the present invention;

Fig. 5 is a schematic flowchart of an automatic calibration method for an AC voltage divider according to the present invention.

In the figure: 1—industrial computer system, 2—broadband high-stable power supply, 3—medium frequency step-up transformer, 4—standard broadband voltage divider, 5—AC voltage divider to be checked, 6—digital voltmeter, 11—industrial computer , 12—data acquisition and control circuit, 13—display, 14—AC contactor control coil, 21—controller, 22—standard signal generator, 23—high power switching power supply, 24—linear power amplifier module, 25—output Filter, 26—overcurrent protection circuit, 27—temperature sensor, 241—power amplification module, 242—isolation transformer.

detailed description

The technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention.

Fig. 1 shows the working principle diagram of the AC voltage divider automatic calibration device of the present invention, which is used to verify the AC voltage divider 5 to be checked, and the AC voltage divider automatic calibration device includes industrial computers connected in sequence System 1, broadband high-stable power supply 2, intermediate frequency step-up transformer 3, standard broadband voltage divider 4, digital voltmeter 6, standard broadband voltage divider 4 and AC voltage divider 5 to be tested are connected in parallel, standard broadband voltage divider 4 The low-voltage arm of the low-voltage arm is connected with the industrial computer system 1, and is used to feed back the voltage of the high-voltage end of the standard broadband voltage divider 4 to the industrial computer system 1, and the digital voltmeter 6 is connected with the AC voltage divider 5 to be tested, and the digital voltmeter 6 is used for display The tester records the voltage value of the AC voltage divider 5 to be checked, and records the standard voltage value displayed by the industrial computer system 1 at the same time, and then checks and evaluates the voltage of the AC voltage divider 5 to be checked.

The industrial computer system 1 is used to send a control signal through the RS232 communication port to control the frequency and amplitude of the output voltage of the broadband high-stable power supply 2, and the standard broadband voltage divider 4 collects the actual output high voltage value and sends it to the industrial computer system 1, and After comparing the set target voltages, the difference is used as a control signal to adjust the broadband regulated power supply 2, so that the error between the target voltage and the actual output voltage is minimized. When the voltage at the high-voltage end of the standard broadband voltage divider 4 reaches a preset detection point, the step-up is automatically stopped (that is, the sending of control signals to the broadband high-stable power supply 2 is stopped).

Please further refer to FIG. 2 , the broadband high-stable power supply 2 includes a controller 21, a standard signal generator 22, a high-power switching power supply 23, a linear power amplification module 24, an output filter 25, an overcurrent protection circuit 26, and a temperature sensor 27. .

One of the signal input terminals of the controller 21 (such as high-speed single-chip microcomputer C8051F020) is connected with the industrial computer system 1 through the RS232 communication port, and is used to receive the control signal sent by the industrial computer system 1. The control signal terminal of the controller 21 is connected with the industrial computer system 1. The standard signal generator 22 is connected to send the control signal into the standard signal generator 22 (for example, DCS chip AD9851) to generate a standard sine wave.

The high-power switching power supply 23 is used to connect to the mains through an AC contactor and a circuit breaker (that is, a three-phase power frequency AC power supply supplies power to it), and generates 8 groups of positive and negative DC voltages of 70V to supply power to the linear power amplifier module 24. The output end of described linear power amplifying module 24 is connected with output filter 25, overcurrent protection circuit 26 successively, and the overdetection signal output end in overcurrent protection circuit 26 and temperature sensor 27 are connected with controller 21, and temperature sensor 27 is installed On the linear power amplification module 24, wherein the over-detection signal output terminal is used to transmit the detected output current signal to the controller 21, the temperature sensor 27 is placed near the linear power amplification module 24 for real-time monitoring of the linear power amplification module 24 temperature, and sent to the controller 21.

The standard signal generator 22 generates a standard sinusoidal voltage under the control of the controller 21, and then enters the linear power amplification module 24 for amplification. Please further refer to Fig. 3, described linear power amplifying module 24 comprises 8 parallel power amplifying modules 241 and the isolation transformer 242 connected in series with each power amplifying module 241 output ends, the standard sinusoidal voltage that described standard signal generator 22 produces After being amplified by 8 power amplification modules 241, it becomes 8 groups of linear power amplified AC voltage signals, and then cascaded through the output of the isolation transformer 242 to generate an AC voltage of 0-400V to realize superposition amplification of power and superposition output of voltage, and then output filtering The output voltage of the broadband high-stable power supply 2 is obtained after filtering by the filter 25. Since the output voltage of the isolation transformer 242 comes from the linear power amplifier, the waveform distortion rate of the output voltage is extremely low, and the high frequency component content of the output voltage signal is extremely low. Therefore, the AC voltage of the driving-intermediate frequency step-up transformer is very stable, and the high voltage value generated by the entire calibration device is very stable.

The controller 21 of the broadband high-stable power supply 2 receives the control signal sent by the industrial computer system 1 via RS232, and sends it to the standard signal generator 22 to generate a standard sine wave to control the linear power amplification module 24, thereby changing the output voltage frequency of the broadband high-stable power supply 2 and magnitude. The output voltage of the broadband high-stable power supply 2 is only determined by the control signal sent by the industrial computer system 1, and is not affected by the fluctuation of the grid voltage. During the entire measurement process, the controller 21 continuously detects the amplitude of the output current and the temperature of the linear power amplifier module 24. When the output current is overloaded or the temperature is over-limited, the controller 21 immediately activates the overcurrent protection or temperature detection protection, and sends a fault protection command to the remote industrial computer system 1 to cut off the power supply of the linear power amplifier module 24 . The output power of the entire broadband high-stable power supply 2 is not lower than 20KVA, and the output voltage amplitude is in two gears of 0-200V and 0-400V.

The intermediate frequency step-up transformer 3 is connected with the standard broadband voltage divider 4, and the voltage on the high voltage side of the standard broadband voltage divider 4 is added to the tested equipment (i.e. the AC voltage divider 5 to be tested), and passed through the standard broadband voltage divider 4 Record the waveform and value of the output voltage in real time. After the user enters the reading of the tested equipment, the device automatically boosts the voltage to the next testing point again. The output voltage range of the device is 0-200kV, the waveform distortion rate is less than 1%, and the output sinusoidal voltage fluctuation value is less than 0.1% of reading + 0.01kV, and the frequency error is less than 0.01Hz.

The intermediate frequency step-up transformer 3 is an electromagnetic transformer, the frequency range of the input and output voltages is 30-300 Hz, the input voltage is 0-440 V, and the output voltage is 0-200 kV. In order to ensure that the intermediate frequency step-up transformer 3 reaches the highest output voltage at 30Hz without saturation (normal operation), the rated output power of the intermediate frequency step-up transformer 3 at a power frequency of 50Hz is twice the maximum output power of the broadband high-stable power supply 2. The power capacity of the iron core used in the voltage transformer 3 is more than 1.67 times higher than that of the power frequency transformer under the same conditions. Considering the high output voltage and large capacity of the intermediate frequency step-up transformer 3, SF6 gas is selected as its internal insulating material. The intermediate frequency step-up transformer 3 also has a set of measuring coils wound on the same iron core as the low-voltage input winding of the intermediate frequency step-up transformer 3 to be used as a measuring voltage transformer, and its rated output voltage is 100V, which is used in the intermediate frequency step-up transformer 3 Monitor high voltage output during operation.

Please further refer to FIG. 4 , the industrial computer system 1 includes an industrial computer 11 , a data acquisition and control circuit 12 , a display 13 , and an AC contactor control coil 14 . The data acquisition and control circuit 12 and the display 13 are connected with the industrial computer 11 , and the AC contactor control coil 14 is connected with the data acquisition and control circuit 12 . The industrial computer 11 includes an operation console and an operation computer connected to the operation console. The operation computer is used to receive the input voltage value to be checked. The operation console is provided with 4 digital panel meters, a power button, a power switch Button, emergency stop button, among which the power button is used to control the broadband high-stable power supply 2 at the beginning of the test, the power button is used to control the broadband high-stable power supply for 2 minutes at the end of the test, and the emergency stop button is used to temporarily cut off the broadband high-stable power supply 2 during the operation. The data acquisition and control circuit 12 is used to receive the voltage at the high voltage end of the standard broadband voltage divider 4 and the input voltage and input current signal of the intermediate frequency step-up transformer 3 (the input current and voltage signal of the intermediate frequency step-up transformer 3 is the broadband high-stable power supply 2) is displayed on the display 13. During the whole test process, the industrial computer system 1 monitors the output voltage of the standard broadband voltage divider 4, the output voltage and the amplitude of the current of the broadband high-stable power supply 2, and realizes monitoring The running state of the entire automatic calibration system, once abnormal, immediately cut off the high-voltage power supply system of the entire device, for example, after receiving the fault protection command issued by the broadband high-stable power supply 2, the industrial computer 11 controls the AC contactor through the data acquisition and control circuit 12 The control coil 14 disconnects the AC contactor to cut off the mains power supply to protect the broadband high-stable power supply 2 .

The AC contactor control coil 14 is used to control the input power of the broadband high-stable power supply 2. Once the control software detects that the system is abnormal, the industrial computer 11 disconnects the AC contactor control coil 14 through the data acquisition and control circuit 12, thereby cutting off the three-phase power supply Power supply to protect broadband high stability power supply 2. The industrial computer operating the console controls the output voltage value of the broadband high-stable power supply 2 through the RS232 port, and continuously collects and monitors the output voltage and output current of the broadband high-stable power supply 2 and the voltage of the intermediate frequency step-up transformer through the data acquisition and control circuit 12 Output high voltage value.

The standard broadband voltage divider 4 is a purely capacitive voltage divider. The capacitance of the high-voltage arm is 100pF, and the dielectric loss is less than 0.00001. In order to ensure the stability of its capacitance, the internal insulation material of the high-voltage capacitor is SF6 gas. The low-voltage arm is composed of 4×1μF broadband and high-stability mica capacitors, and a 1MΩ precision resistor is connected in parallel at both ends of the 4 mica capacitors. The function is to release the residual energy on the mica capacitors when the voltage divider is not working, ensuring that At the beginning of the measurement, the 4μF capacitor of the low-voltage arm is always boosted from zero potential, and there is no DC component deviation. The influence of the ratio error of the voltage divider caused by the parallel 1MΩ resistance can introduce a frequency ratio calibration factor K _f , which is corrected by the acquisition system to ensure the measurement accuracy. K _f is related to the frequency of the signal on the current standard broadband voltage divider. The frequency and amplitude of the signal are controlled by the control module and collected and processed. The verification of the frequency is very easy to implement.

The following is the working principle that the device provided by the present invention realizes automatic pressure regulation process control:

The industrial computer system 1 is equipped with control software, and its flow chart is shown in FIG. 5 . Taking the detection of 200kV power frequency divider as an example, set the voltage points to be detected during the rising and falling process: 20kV, 40kV, 60kV...160kV, 180kV, 200kV, set the voltage frequency to 50Hz. The device boosts the voltage from zero and maintains the output voltage when it reaches 20kV. At this time, the operator records the reading of the AC voltage divider 5 to be tested displayed on the digital voltmeter 6, and then the device continues to automatically boost the voltage to the next voltage point, and so on. Calibration of all voltage points.

Before the test, the voltage rise and fall points to be verified are set in the industrial computer system 1 . The standard broadband voltage divider 4 collects the difference between the actual output high voltage value and the set target voltage as a feedback signal, and the industrial computer system 1 controls the output voltage change of the broadband high-stable power supply 2 . When the difference is less than 0.1kV, the output voltage remains stable. During the entire verification process, the industrial computer system 1 continuously monitors the output voltage and output current of the broadband high-stable power supply 2 through the data acquisition and control circuit 12 . When it is detected that the peak value of the input current of the intermediate frequency step-up transformer 3 is suddenly greater than 1.414 times the maximum output current of the broadband high-stable power supply 2, it is considered that the test product has a breakdown short circuit at this time, and the device immediately cuts off the three-phase power supply circuit of the broadband high-stable power supply 2 ; When it is detected that the ratio of the high-voltage end voltage of the standard broadband voltage divider 4 to the output voltage of the broadband high-stable power supply 2 is less than 95% of the rated transformation ratio of the intermediate frequency step-up transformer 3, it is considered that the circuit is overloaded at this time, and the device immediately cuts off the broadband high-stable power supply. The three-phase power supply circuit of the power supply 2; when it is detected that the ratio of the high-voltage terminal voltage of the standard broadband voltage divider 4 to the output voltage of the broadband high-stable power supply 2 is greater than 110% of the rated transformation ratio of the intermediate frequency step-up transformer 3, it is considered that resonance has occurred in the system, At this time, the industrial computer system 1 adjusts the adjustment range of the output voltage of the broadband high-stable power supply 2 , such as the step size of the voltage change, so as to prevent overvoltage from being generated too quickly during the voltage regulation process. Specifically, the rated change step size is multiplied by Ns as the new broadband high-stable power supply output voltage step size, and the calculation formula of Ns is shown in the following formula:

Where Vs is the actual output voltage of the broadband high-stable power supply 2 , Vp is the actual output voltage of the intermediate frequency step-up transformer 3 , and Kp is the rated transformation ratio of the intermediate frequency step-up transformer 3 .

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any changes or substitutions that can be easily imagined by those skilled in the art within the technical scope disclosed in the present invention, All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the protection scope of the claims.

Claims (9)

1. A kind of 1. AC potentiometer automatic check device, it is characterised in that：Including industrial computer system (1), the wideband being sequentially connected High voltage-stabilizing power supply (2), intermediate frequency step-up transformer (3), standard wideband divider (4), standard wideband divider (4) are used for and friendship to be checked Flow point depressor (5) is connected in parallel；

   The industrial computer system (1), for according to voltage detecting point set in advance, sending control signal control wideband Gao Wen electricity The frequency and amplitude of source (2) output voltage, voltage sample is carried out to standard wideband divider (4), tune is automatically controlled using feedback The voltage of quasi- wideband divider (4) high-pressure side of feast-brand mark and the error of goal-setting voltage, when standard wideband divider (4) high-pressure side Voltage be automatically stopped boosting when reaching voltage detecting point set in advance；

   The high voltage-stabilizing power supply of wideband (2) include controller (21), reference signal generator (22), high power switching power supply (23), Linear prower amplifier module (24), output filter (25), the controller (21) are used to receive the industrial computer system (1) hair The control signal gone out, the control signal is sent into reference signal generator (22) and produces standard sine wave, the linear power Amplification module (24) includes 8 power amplifier modules (241) in parallel and connected with each power amplifier module (241) output end Isolating transformer (242), standard sine voltage caused by the reference signal generator (22) passes through 8 power amplifier modules (241) 8 groups of linear prower amplifier ac voltage signals are turned into after amplifying, then by isolating transformer (242) output stage coproduction Raw 0~400V alternating voltage, the output voltage of the high voltage-stabilizing power supply of wideband (2) is obtained after output filter (25) filtering；

   The intermediate frequency step-up transformer (3) is exported to standard wideband after being used for the output voltage boosting to the high voltage-stabilizing power supply of wideband (2) Divider (4) and AC potentiometer to be checked (5).
2. 2. AC potentiometer automatic check device as claimed in claim 1, it is characterised in that：The high voltage-stabilizing power supply of wideband (2) Also include high power switching power supply (23), for accessing civil power by A.C. contactor, breaker, 8 groups of positive and negative 70V's of generation is straight Stream voltage is respectively 8 power amplifier modules (241) power supply of linear prower amplifier module (24).
3. 3. AC potentiometer automatic check device as claimed in claim 1 or 2, it is characterised in that：The high voltage-stabilizing power supply of wideband (2) current foldback circuit (26), the temperature sensor (27) in linear prower amplifier module (24), output filter are also included Ripple device (25) is connected with current foldback circuit (26), mistake detection signal output end and TEMP in current foldback circuit (26) Device (27) is connected with controller (21), when current foldback circuit (26) detects output current overload or temperature sensor (27) inspection Measure temperature to cross in limited time, controller (21) sends error protection order and put to cut off linear power to long-range industrial computer system (1) The power supply of big module (24).
4. 4. AC potentiometer automatic check device as claimed in claim 2, it is characterised in that：Industrial computer system (1) bag Industrial computer (11), data acquisition and control circuit (12), the A.C. contactor control coil (14) being located on A.C. contactor are included, Data acquisition is connected with control circuit (12) with industrial computer (11), A.C. contactor control coil (14) and data acquisition and control Circuit (12) connects, and after the error protection order that the high voltage-stabilizing power supply of wideband (2) is sent is received, industrial computer (11) passes through data acquisition A.C. contactor is disconnected to cut off mains-supplied with control circuit (12) control A.C. contactor control coil (14).
5. 5. AC potentiometer automatic check device as claimed in claim 4, it is characterised in that：The industrial computer system (1) is also Including the display (13) being connected with industrial computer (11), the data acquisition is additionally operable to the standard of reception with control circuit (12) The voltage of wideband divider (4) high-pressure side and the output current voltage signal of the high voltage-stabilizing power supply of wideband (2), and in display (13) On shown.
6. A kind of 6. AC potentiometer automatic Verification method, it is characterised in that application exchange point as described in any in claim 1-5 Depressor automatic check device carries out following steps：

   Step 1: voltage detecting point is preset in industrial computer system (1), by AC potentiometer to be checked (5) and standard wideband Divider (4) is connected in parallel, while AC potentiometer to be checked (5) is connected with digital voltmeter (6)；

   Step 2: industrial computer system (1) sends the control signal control high voltage-stabilizing power supply of wideband according to voltage detecting point set in advance (2) frequency and amplitude of output voltage, standard wideband divider (4) collection reality output high-voltage value are sent into industrial computer system (1), after compared with the target voltage of setting, industrial computer system (1) is realized difference as control signal to wideband voltage stabilizing The regulation of power supply so that the error of target voltage and the voltage of reality output is minimum, when standard wideband divider (4) high-pressure side Voltage is automatically stopped boosting when reaching voltage detecting point set in advance；

   Step 3: the standard voltage value of record industrial computer system (1) display and the exchange to be checked point of digital voltmeter (6) display The reading of depressor (5), relatively the voltage check for being detected AC potentiometer (5) is evaluated afterwards, is then back to step 2, until complete Into the calibration of all electrical voltage points.
7. 7. AC potentiometer automatic Verification method as claimed in claim 6, it is characterised in that：The high voltage-stabilizing power supply of wideband in step 2 (2) after controller (21) receives the control signal that industrial computer system (1) is sent, the control signal is sent into standard signal Generator (22) produces standard sine wave, and standard sine voltage caused by the reference signal generator (22) passes through 8 power Turn into 8 groups of linear prower amplifier ac voltage signals after amplification module (241) amplification, it is then defeated by isolating transformer (242) Go out the alternating voltage that cascade produces 0~400V, the output of the high voltage-stabilizing power supply of wideband (2) is obtained after output filter (25) filtering Voltage.
8. 8. AC potentiometer automatic Verification method as claimed in claim 6, it is characterised in that：The high voltage-stabilizing power supply of wideband (2) In current foldback circuit (26) detect output current overload or temperature sensor (27) detect that temperature is crossed in limited time, controller (21) error protection order is sent to long-range industrial computer system (1) to cut off the power supply of linear power amplifier module (24).
9. 9. AC potentiometer automatic Verification method as claimed in claim 8, it is characterised in that：The industrial computer system (1) exists After receiving the error protection order that the high voltage-stabilizing power supply of wideband (2) is sent, industrial computer (11) passes through data acquisition and control circuit (12) Control A.C. contactor control coil (14) disconnects A.C. contactor to cut off mains-supplied.