CN215449414U

CN215449414U - Testing device based on multichannel synchronous diagnosis

Info

Publication number: CN215449414U
Application number: CN202121892472.4U
Authority: CN
Inventors: 张建; 尹娟; 张方荣; 高兴琼
Original assignee: Gauss Electronics Technology Co ltd
Current assignee: Gauss Electronics Technology Co ltd
Priority date: 2021-08-13
Filing date: 2021-08-13
Publication date: 2022-01-07
Anticipated expiration: 2031-08-13

Abstract

The utility model discloses a testing device based on multi-channel synchronous diagnosis, which comprises a signal source, an alternating current-direct current amplifier, a shunt, an adapter, an auxiliary power supply and a waveform display device, wherein the signal source is connected with the alternating current-direct current amplifier; the output end of the signal source is connected with the AC/DC amplifier, and the output end of the AC/DC amplifier is connected with the shunt; the output ends of the auxiliary power supply and the shunt are connected with the adapter, the output end of the adapter is connected with the equipment to be tested, and the monitoring end of the adapter is connected with the waveform display device. The utility model can be suitable for different application occasions, and can realize the simultaneous test of all phases of the tested equipment when the tested equipment is three-phase integrated or three-phase independent.

Description

Testing device based on multichannel synchronous diagnosis

Technical Field

The utility model relates to multi-channel synchronous diagnosis, in particular to a testing device based on multi-channel synchronous diagnosis.

Background

At present, the mainstream power equipment and power overhead line tests are single-phase tests, and if the tested equipment is three-phase integrated or three-phase independent, the tests are usually performed one by one, and the condition has several disadvantages:

(1) the repeatability of the test equipment is poor, the data of the three-phase test can drift, and if the three-phase data are required to be compared, the stability, the time synchronism and the environmental influence during the test need to be fully considered.

(2) For the environment that the problem can be found only by the contrast test with higher real-time performance, if the one-phase test is caused by the randomness of instrument or field interference, instrument temperature drift caused by test asynchronization or disturbed randomness of tested equipment, the abnormity of a certain phase in three phases is difficult to distinguish, so the independent phase gradual test method in the condition is useless.

(3) If the tested equipment is electrified, the signal source of the tested equipment can not be effectively isolated from the tested equipment, or the influence randomness of the electrified signal multi-channel equipment can not be generated, so that the test and the comparison can not be carried out;

(4) the test of the multi-channel equipment is realized by lacking a set of multifunctional device which has strong universality and wide application range and is compatible with controllable signal source output, time domain analysis, frequency domain analysis and reflection analysis.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art, provides a testing device based on multi-channel synchronous diagnosis, can be suitable for different application occasions, and can realize the simultaneous testing of all phases of tested equipment when the tested equipment is three-phase integrated or three-phase independent.

The purpose of the utility model is realized by the following technical scheme: a testing device based on multi-channel synchronous diagnosis comprises a signal source, an alternating current-direct current amplifier, a shunt, an adapter, an auxiliary power supply and a waveform display device;

the output end of the signal source is connected with the AC/DC amplifier, and the output end of the AC/DC amplifier is connected with the shunt; the output ends of the auxiliary power supply and the shunt are connected with the adapter, the output end of the adapter is connected with the equipment to be tested, and the monitoring end of the adapter is connected with the waveform display device.

Preferably, the testing device further comprises a signal acquisition module and a microcontroller, wherein at least one of the output end of the alternating current/direct current amplifier or the monitoring end of the adapter is connected with the signal acquisition module; the signal acquisition module is connected with the microcontroller. The testing device further comprises a communication module, a display and at least one digital temperature and humidity sensor, wherein the communication module, the display and the at least one digital temperature and humidity sensor are connected with the microcontroller. The testing device further comprises a control panel or an industrial personal computer connected with the microcontroller, and the microcontroller is further connected with the control input end of the signal source.

Preferably, the splitter is a shunt converter for switching a single-path BNC input end to a three-path BNC output end, the single-path BNC input end is connected to the ac/dc amplifier, and each path of BNC output end of the shunt converter is connected to the adapter;

and a step-up/step-down transformer is arranged between each path of BNC output end of the parallel converter and the adapter.

Preferably, the waveform display device is a multi-channel oscilloscope, a frequency spectrograph or a time domain pulse reflectometer, and the auxiliary power supply is a direct current bias power supply or an alternating current power supply.

Preferably, the adapter comprises a multipath adaptation channel; the adaptive channels are the same in number and correspond to the BNC output ends of the splitters one by one;

each path of the adaptive channel comprises a channel input end, a channel output end, a current sampling circuit, a voltage sampling circuit, a switch module and a monitoring end, wherein the channel input end of the adaptive channel is used for being connected with the BNC output end corresponding to the adaptive channel, and the channel output end of the adaptive channel is used for being connected with a tested device; a signal path of an adaptive channel is formed between the channel input end and the channel output end;

the monitoring end comprises a current monitoring port and a voltage monitoring port; the current sampling circuit is connected in series in a signal path between the channel output end and the channel output end, and the sampling output end of the current sampling circuit is connected with the current monitoring port; the first end of the voltage sampling circuit is connected between the channel input end and the current sampling circuit, and the second end of the voltage sampling circuit is grounded; and the sampling output end of the voltage sampling circuit is connected with the voltage monitoring port.

Preferably, the frequency range of the signal source is 0.00001Hz-60000MHz, and the AC/DC amplifier is an amplifier with adjustable amplification factor.

The utility model has the beneficial effects that: the utility model can realize the insulation diagnosis of three-phase electrical equipment in a wider field, such as a three-phase cable or a multi-core cable, a three-phase transformer, a three-phase mutual inductor, a three-phase electrical switch, a motor, a three-phase sleeve, a three-phase capacitor, an overhead line, an insulator, insulating oil, an oil paper insulating layer, a lightning arrester, independent ABC three-phase equipment, the synchronous test of various insulating or semi-insulating material samples, the pulse dust removal of multi-channel equipment, the test and repair of a battery, a middle and low voltage line of a building body or a locomotive, the combination equipment of the cable and the battery, the combination equipment of the cable and an inverter, the combination equipment of the GIS cable and the mutual inductor, the combination mutual inductor, power distribution or power transmission and distribution simulation equipment and the like.

Drawings

FIG. 1 is a functional block diagram of the present invention;

FIG. 2 is a schematic diagram of an embodiment of a splitter;

FIG. 3 is a diagram illustrating a single-channel adaptation channel in an embodiment;

FIG. 4 is a schematic diagram of a single-channel adaptive channel when current monitoring is required;

FIG. 5 is a schematic diagram of a single adaptation channel when no current is required to be monitored;

FIG. 6 is a schematic diagram of a voltage sampling module employing a directional coupler;

FIG. 7 is a schematic diagram of a voltage sampling module, which is a specific example of a type of directional coupler.

Detailed Description

The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.

As shown in fig. 1, a testing apparatus based on multi-channel synchronous diagnosis includes a signal source, an ac/dc amplifier, a splitter, an adapter, an auxiliary power supply, and a waveform display apparatus;

In an embodiment of the application, the testing device further comprises a signal acquisition module and a microcontroller, wherein at least one of the output end of the alternating current/direct current amplifier or the monitoring end of the adapter is connected with the signal acquisition module; the signal acquisition module is connected with the microcontroller. The signal acquisition module can adopt an analog-to-digital conversion module, an amplitude-phase measurement module or a phase discriminator module and the like.

The testing device further comprises a communication module, a display and at least one digital temperature and humidity sensor, wherein the communication module, the display and the at least one digital temperature and humidity sensor are connected with the microcontroller. The testing device further comprises a control panel or an industrial personal computer connected with the microcontroller, and the microcontroller is further connected with the control input end of the signal source. The shunt is a parallel converter for converting a single-path BNC input end into three-path BNC output ends, the single-path BNC input end is connected with an alternating current-direct current amplifier, and each path of BNC output end of the parallel converter is connected with the adapter; and a step-up/step-down transformer is arranged between each path of BNC output end of the parallel converter and the adapter. The shunt is a multi-channel passive shunt device including a resistor R, a resistor and capacitor RC composite branch, an inductor, and a resistor and inductor connected in series, for example, the shunt has a three-way parallel structure, and each way is formed by connecting a resistor and a capacitor in parallel, as shown in fig. 2.

In an embodiment of the present application, the waveform display device is a multi-channel oscilloscope, a frequency spectrograph, or a time domain pulse reflectometer, and the auxiliary power supply is a dc bias power supply or an ac power supply.

As shown in fig. 3, the adapter includes multiple adaptation channels; the adaptive channels are the same in number and correspond to the BNC output ends of the splitters one by one;

the monitoring end comprises a current monitoring port and a voltage monitoring port; the current sampling circuit is connected in series in a signal path between the channel output end and the channel output end, and the sampling output end of the current sampling circuit (current sampling module) is connected with the current monitoring port; the first end of the voltage sampling circuit (voltage sampling module) is connected between the channel input end and the current sampling circuit, and the second end of the voltage sampling circuit is grounded; and the sampling output end of the voltage sampling circuit is connected with the voltage monitoring port.

In the embodiment of the application, the voltage sampling circuit adopts a divider resistor and a voltage transformer to monitor the output voltage, the current sampling circuit adopts a current transformer, a sampling resistor and a micro-current amplifier to detect the output current waveform, and the monitoring interface type includes but is not limited to SMA, BNC, TNC and aviation connector.

The frequency range of the signal source is 0.00001Hz-60000MHz, and the AC/DC amplifier is an amplifier with adjustable amplification factor; the alternating current-direct current amplifier comprises a plurality of stages of operational amplifiers, wherein the non-inverting input end of each stage of operational amplifier is grounded, and an adjustable feedback resistor is arranged between the output end and the inverting input end of each stage of operational amplifier and used for adjusting output voltage;

the inverting input end of the first-stage operational amplifier is connected with a signal source, and from the second-stage operational amplifier, the inverting input end of each stage of operational amplifier is connected with the output end of the last-stage operational amplifier;

the output end of the last stage operational amplifier is connected with a shunt.

As shown in fig. 4, in some embodiments, when current sampling is required, the one-way adaptation channel includes a voltage monitoring port J1 and a current monitoring port R1; j1 and R1 are BNC port or aviation socket or flat cable or pin; sampling is carried out through a voltage sampling module J and a current sampling module R; the voltage sampling module adopts a voltage transformer, a divider resistor or a divider capacitor, and the current sampling module adopts a current transformer, an active micro-current amplifier or an IV current-voltage converter.

In other embodiments, as shown in fig. 5, when monitoring of the current is not required, the current sampling module R is designed as an interface with a shorting pin connected in parallel to the interface switch, and the R is shorted by closing the parallel switch, or R is designed as a BNC input and a BNC output; therefore, the R current sampling module is convenient to be connected in series when needing to be connected, and can be directly removed when not needed.

As shown in fig. 6, in some other embodiments, the voltage sampling module may further employ a directional coupler, where the directional coupler generally includes an incident end and a coupling output end, and there may be a plurality of coupling ends similar to a transformer structure, and the output of the incident signal and the reflected signal is implemented by changing the polarity of a homonymous end or a heteronymous end of the coupling ends. The incident end is usually a short circuit line structure, so the directional coupler does not affect the signal transmission to the device under test end. When the impedance at the device under test end does not match the impedance of the source under test (or equivalent resistance understood to be a splitter and adapter), reflections are produced, which reflect signal strength in a substantially linear relationship to the match difference.

When the coupling output of the fixed coupler has only one port, which is usually called a reflected signal output, the polarity of the port is opposite to that of the incident signal, as shown in the directional coupler within the dashed box of fig. 7.

The adaptation channels shown in fig. 6-7 use a directional coupler structure to detect voltage signals, and when test signals pass through the directional coupler, test signals are applied to the device under test. Due to the impedance difference of the device to be tested or the impedance change of the device to be tested under different frequencies, an induced voltage signal, namely a reflected signal, is generated at the coupling output end of the directional coupler.

The impedance value of the load end can be calculated by measuring the intensity of the reflected signal or the ratio of the reflected signal to the incident signal, and the algorithm belongs to a known theory and is not deeply explained.

It should be noted that the above is merely an introduction of a directional coupler, which provides an output of reflected voltage and a monitoring interface. Some directional couplers have a bidirectional positive and negative coupling structure, namely, the incident end and the reflection end of the directional coupler are connected in series with a positive polarity loop and a negative polarity loop of the test output end, the positive polarity loop is provided with a coupling output end, and the negative polarity loop is also provided with a coupling output end, so that the directional coupler has a positive and negative reflection output function. Some directional couplers also increase the coupling output port of the incident signal (the design principle is similar to the same-name end of the transformer winding), so that the S value can be calculated conveniently (S11, S21, S22, S12 and the like).

The access of the directional coupler does not influence the application of a test signal to a tested device end and the current sampling, and the access of the directional coupler does not influence the current sampling, and the access of the directional coupler and the voltage sampling end of the resistance voltage division are characterized in that: the directional coupler can distinguish the incidence and reflection of the signal, and the resistance voltage division does not have the function. Obviously, when the adapter is multi-channel, an equivalent number of multiple directional couplers are required, and the number of output monitoring ports may also include multiple ports such as a reflected voltage output and an incident voltage output according to different structures of the directional couplers.

The working principle of the utility model is as follows: for three-phase testing equipment, under the instruction of a control panel/an industrial personal computer, a microcontroller controls a signal source A to send out signals (sine, cosine, square wave, triangular wave and shock wave) with corresponding frequency, the signals output by the output end of the signal source can be directly transmitted to a signal acquisition module after passing through an AC/DC amplifier, the signals output by the AC/DC amplifier are output through a shunt (default to 3 paths, actually any path larger than 1 path), each path of the shunt is connected with a corresponding adaptive channel in an adapter, the output end of each adaptive channel is connected with a certain phase of tested equipment, test information can be output through a monitoring end (a current monitoring port and a voltage monitoring port) in the adaptive channel, the test information can be transmitted to waveform display equipment for displaying, so that a test result can be observed, on the other hand, the test information can also be transmitted to the signal acquisition module, the signal acquisition module acquires the test information output by the adaptive channel or the signal output by the AC/DC amplifier and transmits the acquisition result to the microcontroller; because the temperature and humidity sensor is arranged, temperature and humidity information of a test site can be collected and transmitted to the display through the microcontroller to be displayed, so that field workers can know the temperature and humidity environment information conveniently. The output end of the auxiliary power supply is respectively connected with the channel input end of each adaptive channel and is mainly used for providing extra current or voltage so as to conveniently adjust the test parameters.

The utility model can provide test modes such as high-voltage excitation, frequency sweep, single-frequency pulse output, high-voltage bias output and the like aiming at different application occasions, and can obtain characteristic parameters such as waveform, frequency spectrum, phase, impedance, time domain reflection quantity, frequency domain reflection quantity, temperature and the like according to different analysis purposes.

The system supports various test application occasions, so that the system can realize the insulation diagnosis of three-phase electrical equipment in a wider field, such as a three-phase cable or a multi-core cable, a three-phase transformer, a three-phase mutual inductor, a three-phase electrical switch, a motor, a three-phase sleeve, a three-phase capacitor, an overhead line, an insulator, insulating oil, an oil paper insulating layer, a lightning arrester, independent ABC three-phase equipment, synchronous testing of various insulating or semi-insulating material samples, multi-channel equipment pulse dust removal, battery testing and repairing, a middle and low voltage line of a building body or a locomotive, cable and battery combination equipment, cable and inverter combination equipment, GIS cable and mutual inductor combination equipment, a combination mutual inductor, power distribution or transmission simulation equipment and the like.

The following further illustrates aspects of the utility model with reference to examples of the utility model:

example 1:

the equipment to be tested is a three-phase high-voltage transformer.

The signal source is an AD9854 DDS module.

And assuming that the splitter is a 3-path parallel branch loop, the input end or any output end of the splitter is synchronously connected to the acquisition module, three signals output by the splitter are respectively connected with corresponding and independent directional couplers, and the output of the directional couplers is connected with the ABC three phases of the tested equipment.

The acquisition module adopts an analog-to-digital conversion module, the typical model is AD7606, 4 channels of the analog-to-digital converter work synchronously, signal source output signals are acquired, 3 paths of signals from the independent directional coupler are transmitted to the microcontroller after analog-to-digital conversion, the typical model of the controller is STM 32F 104 series 32-bit processor, and the signals are displayed on an LCD display screen after related calculation in the microprocessor. The difference is visually judged by comparing the multi-channel data. If other operations are needed, the microprocessor can be connected with an external industrial personal computer or a mobile PC through the communication module, or transmitted to background monitoring equipment through the communication module for calculation and observation.

In order to more accurately evaluate the stability and reference significance of test data, a digital temperature and humidity sensor is connected to a microprocessor terminal, so that environment temperature and humidity information can be synchronously obtained, and the measurement of certain parameters which are easily influenced by environment humidity has better practical value.

The embodiment is also suitable for three-phase coils, three-phase reactors, three-phase motors and the like.

Example 2:

and the tested equipment is a three-phase high-voltage cable line.

The microcontroller is internally provided with an ADC with at least 6 channels.

And assuming that the splitter is a 3-path parallel branch loop, the input end or any output end of the splitter is synchronously connected to the AD, three signals output by the splitter are respectively connected with corresponding and independent directional couplers, and the output of the directional couplers is connected with the ABC three phases of the tested equipment.

The acquisition module is a three-way phase detector module, and each phase detector module has two input terminals of A1 and A2. The two terminals of the output end are respectively: the ratio or log of the ratio of a1/a2 and the phase difference of a1 and a 2.

A typical block of the phase detector is AD 8302.

The input end of A1 of the phase detector is from the terminal of the three-way parallel branch of the output end of the signal source, and the three-way parallel terminal is also connected with the input end of the directional coupler, so the three input ends A1 of the three-way phase detector and the input end of the three-way directional coupler are in parallel connection. Of course, since the input terminals of the three-way directional coupler are substantially in parallel connection, the input terminals of the three-way phase detector can also be connected in parallel, and then the parallel terminals are connected with the output of the signal source.

The output of the three-way phase discriminator is an analog signal which is connected with the microprocessor, and 6-way signals of the three-way phase discriminator are obtained through an ADC (analog to digital converter) integrated in the microprocessor. (each path of phase discriminator output has two analog terminals, one path is the ratio of two paths of input signals, the other path is the phase difference of two paths of input signals).

In this mode, the microprocessor obtains the ratio of the incident voltage and the reflected voltage of the three-phase high-voltage cable and the phase difference between the incident voltage and the reflected voltage. Here the incident voltage designates the signal to the input of the coupler and the reflected voltage designates the signal to be output to the reflected end of the coupler. Of course, the impedance of the cable may also be measured by the incident cable and the reflected voltage, and under the condition of frequency sweep, the impedance spectrum or the reflected spectrum may also be obtained, which is not described in detail herein.

The embodiment is also suitable for testing or continuously monitoring the cable terminal, the charging direct-current cable and the cable intermediate joint.

Example 3:

the tested equipment is a three-phase cable and an overhead composite line.

The low-current grounding potential hazard observation device is used for observing the low-current grounding potential hazard of the distribution line.

The frequency conversion signal source is composed of a DDS signal generator and a high-voltage broadband amplifier. The broadband amplifier is a product HA820 amplifier, a TREK 2100F amplifier or a TEGAM 2340 amplifier, and the three-channel output voltage is positive and negative 150V.

The bias voltage is set to 110V direct current, so that the actual output three-channel voltage range is-40V to 260V.

And setting a signal generator to output sweep frequency signals with the frequency of 0.001Hz-3.5GHz to obtain reflection frequency spectrums of the three channels in the frequency domain range, and comparing and observing according to frequency domain curves of the three channels to quickly and simply find abnormal channels (abnormal phases in three phases of A, B and C). When positioning analysis is needed, the frequency domain data is transformed to a time domain through FFT Fourier, the wave speed of electromagnetic waves is set, and the time domain coordinate can be transformed to a position coordinate, so that the judgment of the abnormal position is realized. This is very practical in the case of a three-phase cable with a faulty point and a central joint, where the strength location information of the central joint is usually very consistent, and the faulty point is usually one of the phases and has a significant difference in amplitude.

The embodiment can be used for testing the three-phase main insulation and also can be used for testing the outer sheath insulation of the cable and positioning analysis.

When the three-phase cable is affected with damp and damaged by media, the impedance angle of a plurality of frequency points can be measured, and the temperature and humidity sensor configured in the patent can be used for accurately correcting related parameters.

The embodiment is also suitable for testing or continuously monitoring the power distribution or transmission line analog simulation device.

Example 4:

and the four-channel oscilloscope is connected with the adapter with the monitoring interface. The signal generator generates 1200Hz pulse signals, 1600V voltage is generated after the signals are amplified by the amplifier, and the voltage is applied to the A, B and C three-phase bushings and the zero sequence phase bushing of the three-phase transformer.

And observing the four-channel real-time waveform through an oscilloscope, comparing the phases with the most serious waveform attenuation or multiple abnormal reflections of waveform characteristics, and regarding the phases as abnormal phases. The method can be used for judging the insulation discharge, oil leakage, moisture containing and the like of the sleeve.

Abnormal phases can also be found by observing the spectrum waveform with an oscilloscope, and the phase with the most disordered spectrum is usually the abnormal phase.

Obviously, the embodiment is also applicable to the discharge or damp of main insulation of a transformer, a three-phase cable, a motor winding, a mutual inductor, a GIS complete set component, a three-phase switch and insulating oil.

When the device is used for a three-phase switch, whether the contact resistance of the three-phase switch is abnormal or not can be detected, and when the hidden danger caused by high temperature, oxidation and poor contact of the contact resistance exists, abnormal reflection can be generated on time domain waveform due to the inductance effect or the non-pure resistance effect of a contact point, so that the fault phase can be clearly observed and screened out on an oscilloscope.

Example 5:

and setting the number of the channels to be 8, and testing and repairing 8 groups of vanadium-titanium battery packs or lead-acid battery packs.

The signal source alternately injects 10kHz-500kHz pulse signals, and the output of the amplifier is 100V.

The temperature and humidity sensor is 8 channels and is respectively connected with the battery pack shell.

And the oscilloscope with 8 channels is accessed to observe real-time waveforms, and the data of the temperature and humidity sensor with 8 channels read in by the MCU is displayed on the PC in real time.

During the pulse voltage application process, the waveform change of the oscilloscope is observed, the performance of the battery pack with less noise is stable, and the internal abnormal impurities are less. In the high-frequency pulse injection process, part of impurities can vibrate and peel off in the electrolyte, so that the electrolyte structure is more stable, the waveform finally reflected on an oscilloscope is purer, and the temperature on the surface of the battery gradually tends to be stable or reduced along with the pulse application process.

Therefore, the embodiment can be used for performance screening of the battery or the container containing the electrolyte and multi-channel battery repair.

Finally, the capacity, the temperature rise and the service life of the battery repaired by the pulse are improved to a certain extent.

When the repair and charging processes need to be observed, bias voltage can be superposed on the pulse, so that the measured voltage has a charging process so as to be captured by the oscilloscope conveniently.

Obviously, through multi-channel reflection or incident waveform observation or combined waveform and temperature combined observation under the application of pulse signals, potential safety hazards such as damp, local short circuit, cracking, aging, deterioration and the like of the battery pack with abnormal chemical impedance can be found, and the screening of the safety battery pack is realized.

The embodiment is also suitable for testing the composite device with the output cable and the battery integrated.

Example 6:

the tested device is a voltage transformer.

The device is used for testing the resonant frequency and the transient characteristic of the voltage transformer.

The signal source generates sweep frequency signals under the control of the microprocessor, after the sweep frequency signals are output by the amplifier, the shunt and the monitoring adapter, the acquisition device synchronously acquires the reflection voltage and the phase of each sweep frequency signal, finally, the reflection voltage and the phase are stored and drawn in the MCU to form a reflection voltage spectrum curve, and a lowest reflection frequency point f is searched on the curve and recorded as a resonant frequency. The stability of the resonance frequency can be used as a basis for evaluating whether the equipment has parameter change.

And applying voltage pulses of 400Vp-p and 35kHz to the voltage transformer to be detected, and accessing an oscilloscope through a monitoring interface to observe the waveforms of the positive half cycle and the negative half cycle of the voltage. And comparing the transient waveform difference of the positive half cycle and the negative half cycle, or observing the waveform stability and the spectrum stability of the voltage transformer under the pulse of the frequency and the voltage amplitude through the spectrum display function of the oscilloscope. When unstable defects such as oil leakage, dampness, poor damping resistance characteristics and the like exist in the voltage transformer, single resonance or multiple resonance can be generated under voltage pulse, and unstable frequency increment and amplitude increment are formed.

The embodiment is also suitable for testing the current transformer and the combined voltage and current transformer.

Example 7:

the device is used for simulating the impact characteristics of lightning waves and poor grounding resistance.

The ground loop is designed to cause the ground impedance to be too high due to the inductance effect or corrosion, and the potential formed by the ground loop is higher than the normal value under the operating environment.

When a pulse test is simply performed, only one overall impedance may be obtained, and the negative effects caused by the abnormal ground circuit cannot be simulated.

And the tested equipment is set as a reactive power compensation and transformer grounding loop of the distribution line.

Firstly, alternating current pulse is applied between the transformer insulation and the ground, and the oscillograph or the acquisition device observes and records the waveform or the frequency spectrum of the alternating current pulse.

Then an auxiliary power supply is applied to an output loop, the voltage is gradually increased from 0.1V to 20V, and the waveform and the frequency spectrum change under the action of the alternating current pulse and the auxiliary power supply are observed.

Then an auxiliary power supply of negative voltage is applied, the voltage is gradually adjusted from-0.1V to-20V, and the waveform or spectrum change is observed.

Comparing the waveforms or frequency spectrums under the condition that the auxiliary power supply is a positive value and a negative value, the method can be used for analyzing whether the grounding loop has the influence of abnormality on the insulation tolerance of the tested equipment; or the method can be used for analyzing whether the tested equipment and the grounding loop have potential safety hazards under the environments of lightning strike voltage and operation overvoltage.

The embodiment is also suitable for testing single-phase or three-phase grounding knife switches (switches) and disconnecting switches with poor contact or incomplete switching-on.

Example 8:

the cable line damping device is used for damping of cable lines of buildings, potential failure hazards and the like.

The inside of the multi-path shunt is in a capacitor series connection mode, so that direct current can be isolated, and reverse invasion of low-frequency alternating current can be reduced.

The method is characterized in that uncertain live and power-off lines exist in a plurality of users in a tested building.

The power supply socket is directly connected to a power strip or a wall socket through an adapter, 20kHz pulse voltage is applied to the socket, and the reflected waveform of the socket is observed through an oscilloscope. When the line accessed by the electrified socket has nonlinear load, linear load and damp points, the reflected waveforms have obvious difference, so that the fault can be judged. If the wet spot is due to the socket location or the socket itself, a discharge signal or severe attenuation of the 20kHz pulse can be observed on the oscilloscope. When the wall body has a plurality of parallel sockets, the sockets can be accessed in a plurality of ways for comparative analysis.

When the wall has multiple lines which are not parallel, multiple injection pulse signals can be adopted, then the reflected waveform is observed, and the lines with serious short circuit and damp or the reference line layout diagram is identified for analysis. There are several methods for analyzing the load characteristics and position of the reflected pulses, which are not illustrated here. The single-pulse frequency-sweeping type pulse signal acquisition device not only can realize the injection and reflection waveform observation of a single pulse, but also can realize the analysis of parameters such as impedance and phase during frequency sweeping measurement, and only needs to control the frequency range to avoid the operating power frequency signal frequency existing in the circuit during frequency sweeping. Obviously, the special point of this patent lies in not knowing whether the wall body circuit is electrified, or even there is the electric leakage phenomenon and lead to some circuit still electrified circumstances all can test even power switch disconnection, and it has the function of self-defining injection frequency, can provide very convenient means for on-the-spot troubleshooting, maintenance and repair, and certainly also can be used for long-term monitoring with the change trend of better observation data. The embodiment is not only suitable for buildings, but also suitable for testing and evaluating complex lines such as production workshops, test places, industrial and mining bases, locomotive tunnels, airplanes, automobiles, electric vehicles, motors, steamships, wiring terminal blocks and the like.

In summary, the present invention provides a multi-channel test, which can be used for amplitude phase testing, or amplitude phase spectrum testing, or impedance testing, impedance spectrum testing, time domain reflection testing, reflection spectrum testing, Smith chart (Smith) mapping and analysis, fault defect localization, dielectric loss testing, moisture content testing, etc. of three-phase or more-channel devices. In the occasion with obvious environmental interference, the three-phase synchronous test can not only improve the working efficiency, but also obtain better signal to noise ratio, and when the fault phase in the three phases needs to be distinguished, the data of the three-phase synchronous test can provide real differentiation and abnormal phase screening.

The innovation of the patent is not only in multichannel synchronous test and excitation test for broadband scanning or single-frequency pulse, but also in that the utility model provides a wider high-frequency test voltage range, and can be flexibly applied to different test objects by adjusting the amplifier or the bias voltage.

Obviously, when the device to be tested is single-phase equipment, because the three output loops and the corresponding connection of the acquisition module are independent, the single-phase equipment can be detected by only one channel.

The above embodiments are only for illustrating the partial implementation of the patent, and any person skilled in the art can make equivalent substitutions and rearrangements based on the patent after understanding the patent information.

Claims

1. A testing device based on multi-channel synchronous diagnosis is characterized in that: the device comprises a signal source, an alternating current-direct current amplifier, a shunt, an adapter, an auxiliary power supply and a waveform display device;

2. The testing device based on multi-channel synchronous diagnosis as claimed in claim 1, wherein: the testing device also comprises a signal acquisition module and a microcontroller, wherein at least one of the output end of the alternating current-direct current amplifier or the monitoring end of the adapter is connected with the signal acquisition module; the signal acquisition module is connected with the microcontroller; the signal acquisition module adopts one of an analog-to-digital conversion module, an amplitude-phase measurement module or a phase discriminator module.

3. The testing device based on multi-channel synchronous diagnosis as claimed in claim 2, wherein: the testing device further comprises a communication module, a display and at least one digital temperature and humidity sensor, wherein the communication module, the display and the at least one digital temperature and humidity sensor are connected with the microcontroller.

4. The testing device based on multi-channel synchronous diagnosis as claimed in claim 2, wherein: the testing device further comprises a control panel or an industrial personal computer connected with the microcontroller, and the microcontroller is further connected with the control input end of the signal source.

5. The testing device based on multi-channel synchronous diagnosis as claimed in claim 1, wherein: the shunt is a parallel converter for converting a single-path BNC input end into three-path BNC output ends, the single-path BNC input end is connected with an alternating current-direct current amplifier, and each path of BNC output end of the parallel converter is connected with the adapter;

6. The testing device based on multi-channel synchronous diagnosis as claimed in claim 1, wherein: the waveform display device is a multi-channel oscilloscope, a frequency spectrograph or a time domain pulse reflectometer, and the auxiliary power supply is a direct current bias power supply or an alternating current power supply.

7. The testing device based on multi-channel synchronous diagnosis as claimed in claim 1, wherein: the adapter comprises a plurality of adaptation channels; the adaptive channels are the same in number and correspond to the BNC output ends of the splitters one by one;

8. The testing device based on multi-channel synchronous diagnosis as claimed in claim 1, wherein: the frequency range of the signal source is 0.00001Hz-60000MHz, and the AC/DC amplifier is an amplifier with adjustable amplification factor.