CN105182117A - DC integrated test platform - Google Patents
DC integrated test platform Download PDFInfo
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- CN105182117A CN105182117A CN201510534023.5A CN201510534023A CN105182117A CN 105182117 A CN105182117 A CN 105182117A CN 201510534023 A CN201510534023 A CN 201510534023A CN 105182117 A CN105182117 A CN 105182117A
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Abstract
The invention relates to the technical field of power equipment reliability evaluation technology and more particularly to a DC integrated test platform, which comprises a first upper computer, a second upper computer, an integrated testing module, an insulation checking module, a grounding parameter checking module, a data communication interface and a power supply module. The first upper computer is used for controlling the integrated testing module, the insulation checking module and the grounding parameter checking module via the grounding parameter checking module and conducting the analysis treatment on acquired and returned data. The integrated testing module is used for testing input and output voltage and current, acquiring ripple factors, conducting the analysis treatment and uploading data to the first upper computer. According to the technical scheme of the invention, the modules can be integrated together to run or separately operated. By means of the test platform, grounding fault points can be quickly found out by utilizing the grounding fault leakage current, without the need of powering off a line, wiring or disassembling wires in the charged operating state of the line. Therefore, the down-time of the equipment of automation and electrification systems is greatly reduced, so that great economic benefits and social benefits are generated.
Description
Technical field
The invention belongs to power equipment reliability assessment technology field, particularly a kind of direct current comprehensive test platform.
Background technology
Domestic current tester for overall characteristic is all that load follows regulator to separate, and can not independently use, and uses also inconvenient, user is rely on artificial electric resistance array when insulation line monitoring device verification in addition, be all by artificial selection resistance manual connecting system when analogue ground, so can there is very large potential safety hazard and circuit unavoidably and cross multipair system and there is security threat, but along with the scale of transformer station is increasing, the distributed capacitance that we ignore also will increase thereupon, if now there is one point earth, charging and discharging state change can be there is in distributed capacitance, now will cause the generation of false protection, in distributed capacitance context of detection, all rely on the distributed capacitance of line apparatus to system to detect now, portable equipment is not had to detect system or branch road distributed capacitance, the software of current also neither one system is assessed distributed capacitance risk, therefore need that a comprehensive DC test platform is enough carries out performance Indexs measure to device therefor in straight-flow system, the positioning searching of the School Affairs earth fault of performance index, to ensure the safe operation of DC test platform.
Summary of the invention
Object of the present invention is solve the problems referred to above of prior art, and provide a kind of multiple functional, direct current comprehensive test platform that detection accuracy is high, to achieve these goals, the technical solution used in the present invention is as follows:
A kind of direct current comprehensive test platform, is characterized in that: comprise the first host computer, second host computer, integration test module, insulating check module, parametric test module over the ground, data communication interface and supply module, described first host computer by data communication interface to integration test module, insulating check module and over the ground parametric test module carry out controlling and to gather the data analysis process returned, described integration test module is used for test input output voltage, electric current, and ripple factor collection, and carry out analyzing and processing and be uploaded to the first host computer, described insulating check module is used for the electric current of external input device, voltage, impedance verifies, and by data upload to the first host computer of verification, the described module of parametric test is over the ground used for the ground capacitance distribution in test macro, Earth design is searched, insulation against ground decline degree, and the data upload to the first of test host computer is carried out analyzing and processing, and tested data upload to the second host computer is carried out risk assessment, described supply module is integration test module, insulating check module and over the ground parametric test module provide working power.
Preferably, described integration test module comprises integration test control module, three-phase voltage regulon, load regulation unit, ripple sampling unit and input and output voltage sampling unit, described integration test control module respectively with three-phase voltage regulon, load regulation unit, ripple sampling unit is connected with input and output voltage sampling unit, and described input and output voltage sampling unit is also connected with three-phase voltage regulon, and described insulating check module comprises insulating check control module, capacitance-resistance array element, DC voltage regulation unit and alternating voltage regulon, described insulating check control module respectively with capacitance-resistance array element, DC voltage regulation unit is connected with alternating voltage regulon, and the described module of parametric test over the ground comprises parametric test control module over the ground, distributed capacitance test cell over the ground, earthing detection and failure location unit and LCD display unit, the described control module of parametric test over the ground respectively with branch's capacity measurement unit over the ground, earthing detection and failure location unit are connected with LCD display unit.
Preferably, described input and output voltage sampling unit comprises the first voltage rectifier, first bleeder circuit and the first filtering circuit, described three-phase voltage regulon comprises the first contact transtat, first driving circuit, first photoisolator and the first protective circuit of voltage regulation, the identification voltage that the adjustable transformation of described first contact exports is by passing through the first voltage rectifier successively, first bleeder circuit and the first filtering circuit input integration test control module carry out identifying processing, the pwm signal that described integration test control module exports after identifying processing is successively by the first photoisolator, first driving circuit and the first protective circuit of voltage regulation feed back input to the first contact transtat.
Preferably; described load regulation unit comprises pure resistor load circuit, igbt transistor amplifying circuit, the second protective circuit of voltage regulation, the second photoisolator, the second filtering circuit summation current transformer; described pure resistor load circuit is connected with integration test control module with the second filtering circuit by current transformer successively, and the signal that described integration test control module exports is successively by the second photoisolator, the second protective circuit of voltage regulation and igbt transistor amplifying circuit feed back input extremely pure load circuit.
Preferably, described pure load circuit at least comprises 12 resistance be connected in parallel, and wherein at least comprises 4 40 Ω resistance, 6 80 Ω resistance, 1 160 Ω resistance, 1 320 resistance.
Preferably, described DC voltage regulation unit comprises and at least comprises two-way latch output unit, described latch output unit comprises direct current rearrangeable switch power supply I, first latch, first relay array, first electric resistance array, second latch, second relay array, second electric resistance array and the first toggle switch group, described insulating check control module is connected with the first latch and the second latch respectively, described first latch is successively by the first relay array, first electric resistance array is connected with the first toggle switch group, described second latch is successively by the second relay array, second electric resistance array is connected with the first toggle switch group, described insulating check control module is also connected with direct current rearrangeable switch power supply I by RS485 data bus, described direct current rearrangeable switch power supply I is also connected with the first toggle switch group.
Preferably, described alternating voltage regulon comprises direct current rearrangeable switch power supply II, direct current rearrangeable switch power supply III, 3rd photoisolator, 3rd driving circuit, 3rd protective circuit of voltage regulation, 3rd contact transtat and the second toggle switch group, described insulating check control module is successively by the 3rd photoisolator, 3rd driving circuit, 3rd protective circuit of voltage regulation, 3rd contact transtat connects, described 3rd contact transtat is connected with the second toggle switch group by balance resistance R3, described insulating check control module is connected with direct current rearrangeable switch power supply II and direct current rearrangeable switch power supply III respectively by RS485 data bus, described direct current rearrangeable switch power supply II and direct current rearrangeable switch power supply III are all distinguished the second toggle switch group and are connected.
In sum, the present invention has following beneficial effect:
(1) the present invention can carry out the verification of performance Indexs measure and performance index to device therefor in straight-flow system, and adopts the cooperation of host computer and slave computer to control, and more brief introduction is clear to make man-machine interactive interface, uses also convenient; The present invention both can use in integration, and independent module also can be divided into use, and overall characteristic test module and distributed capacitance test module can move forward into exercise and use;
(2) the present invention can not have a power failure under circuit live line work state, not fishing line, do not understand bundle of lines when utilize earth fault Leakage Current to search fast earth fault; considerably reduce the stop time of robotization and electrification systems equipment; produce great economic benefit and social benefit
(3) three-phase voltage of the present invention regulates and adopts classification to regulate, and makes the adjustment of voltage more quick and precisely; Insulating check module can all in analog DC system when insulation fault, comprise direct current and alter mutually and exchange the fault scurrying into direct current; Distributed capacitance test module can have several functions, both can the distributed capacitance of test macro or branch road, also can to the location of the insulation reduction existed in straight-flow system or earth fault, searching ground connection can the size of conditioning signal amplitude and frequency, avoid there is signal disturbing, the radio communication synchronous mode that earthing searching adopts, if signal synchronous once after when not shutting down, same system the distance that can detect do not limit;
(4) high-precision voltage divider is adopted to carry out dividing potential drop, be grounded or distributed capacitance test system voltage scope be: 24 ~ 240V, have employed voltage follower circuit and RC filtering circuit carries out double-smoothing to the voltage after voltage divider, improve the accuracy detected.
Accompanying drawing explanation
In order to be illustrated more clearly in example of the present invention or technical scheme of the prior art, introduce doing accompanying drawing required in embodiment or description of the prior art simply below, apparently, accompanying drawing in the following describes is only examples more of the present invention, to those skilled in the art, do not paying under creationary prerequisite, other accompanying drawing can also obtained according to these accompanying drawings.
Fig. 1 is the fundamental diagram of a kind of direct current comprehensive test platform of the present invention.
Fig. 2 is input and output voltage sampling unit fundamental diagram of the present invention.
Fig. 3 is load regulation unit bag fundamental diagram of the present invention.
Fig. 4 is the fundamental diagram of pure load circuit of the present invention.
Fig. 5 is the fundamental diagram of DC voltage regulation unit of the present invention.
Fig. 6 is electric resistance array of the present invention and relay array annexation figure.
Fig. 7 is capacitor array of the present invention and relay array annexation figure.
Fig. 8 is the fundamental diagram of alternating voltage regulon of the present invention.
Fig. 9 is the fundamental diagram of the test cell of distributed capacitance over the ground of the present invention.
Figure 10 is the fundamental diagram of earthing detection of the present invention and failure location unit.
Embodiment
Below in conjunction with the accompanying drawing in example of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Composition graphs 1, a kind of direct current comprehensive test platform, it is characterized in that: comprise the first host computer, the second host computer, integration test module, insulating check module, over the ground parametric test module, data communication interface and supply module, described first host computer by data communication interface to integration test module, insulating check module and over the ground parametric test module control and to gather the data analysis process returned, in invention, described data communication interface is RS485 data-interface.Described integration test module is used for test input output voltage, electric current, and ripple factor collection, and carry out analyzing and processing and be uploaded to the first host computer, described insulating check module is used for the electric current of external input device, voltage, impedance verifies, and by data upload to the first host computer of verification, the described module of parametric test is over the ground used for the ground capacitance distribution in test macro, Earth design is searched, insulation against ground decline degree, and the data upload to the first of test host computer is carried out analyzing and processing, and tested data upload to the second host computer is carried out risk assessment, described supply module is integration test module, insulating check module and over the ground parametric test module provide working power.
Composition graphs 1, described integration test module comprises integration test control module, three-phase voltage regulon, load regulation unit, ripple sampling unit and input and output voltage sampling unit, described integration test control module respectively with three-phase voltage regulon, load regulation unit, ripple sampling unit is connected with input and output voltage sampling unit, described input and output voltage sampling unit is also connected with three-phase voltage regulon, described insulating check module comprises insulating check control module, capacitance-resistance array element, DC voltage regulation unit and alternating voltage regulon, described insulating check control module respectively with capacitance-resistance array element, DC voltage regulation unit is connected with alternating voltage regulon, the described module of parametric test over the ground comprises parametric test control module over the ground, distributed capacitance test cell over the ground, earthing detection and failure location unit and LCD display unit, the described control module of parametric test over the ground respectively with branch's capacity measurement unit over the ground, earthing detection and failure location unit are connected with LCD display unit, in embodiments of the present invention, described integration test control module, insulating check control module and over the ground parametric test control module adopt the STM32F107 processor based on Cortex-M3 kernel.
As shown in Figure 2, described input and output voltage sampling unit comprises the first voltage rectifier, first bleeder circuit and the first filtering circuit, described three-phase voltage regulon comprises the first contact transtat, first driving circuit, first photoisolator and the first protective circuit of voltage regulation, the identification voltage that the adjustable transformation of described first contact exports is by passing through the first voltage rectifier successively, first bleeder circuit and the first filtering circuit input integration test control module carry out identifying processing, the pwm signal that described integration test control module exports after identifying processing is successively by the first photoisolator, first driving circuit and the first protective circuit of voltage regulation feed back input to the first contact transtat.Wherein, input/output voltage obtains by the first voltage rectifier and the first bleeder circuit the magnitude of voltage that voltage sample can identify, because input is all alternating voltage, Analog-digital Converter chip None-identified, therefore the magnitude of voltage obtained after dividing potential drop is carried out rectification, be by the second-order low-pass filter circuit (the first filtering circuit) be made up of RC circuit, filtering is carried out to DC voltage after direct current by the first voltage rectifier ac voltage rectifier, filtered voltage is directly sent into integration test control module and simulating signal is turned digital signal, then data processing is carried out, in order to the pin preventing extraneous electrostatic interference from burning out integration test control module, protective circuit of diode is added between input and output voltage sampling unit and integration test control module pin.
Composition graphs 1 and Fig. 2, in embodiments of the present invention, first host computer passes through the move instruction of RS485 data communication interface to integration test control module, integration test control module sends PWM regulable control signal after receiving voltage-regulation instruction, the first driving circuit (adopting L298N motor drive ic) and the first protective circuit of voltage regulation is controlled after the first photoelectrical coupler (adopting TLP512-4 opto-coupler chip) carries out Phototube Coupling, then control the embedded DC speed-reducing of the first contact transtat by L298N motor drive ic to rotate, send the signal command of PWM regulable control by integration test control module to control motor drive ic L298N and export different level and realize rotating and reverse of motor, the range of adjustment that can realize voltage is: (70% ~ 120%) * input voltage, the test of supply DC charging motor uses.In the present invention; described first protective circuit of voltage regulation comprises diode D1 and diode D2; the anode of described diode D1 is connected with the negative electrode of diode D2 and is connected with the output terminal of the first driving circuit afterwards, and the negative electrode of described diode D1 connects+5V supply voltage, the anode of diode D2 and grounding connection.
As shown in Figure 3, described load regulation unit comprises pure resistor load circuit, igbt transistor amplifying circuit, second protective circuit of voltage regulation, second photoisolator, second filtering circuit summation current transformer, described pure resistor load circuit is connected with integration test control module with the second filtering circuit by current transformer successively, the signal that described integration test control module exports is successively by the second photoisolator, second protective circuit of voltage regulation and igbt transistor amplifying circuit feed back input are to pure load circuit, in the present invention, described second protective circuit of voltage regulation comprises diode D3 and diode D4, anode and the negative electrode of diode D4 of described diode D3 are connected in parallel and are connected with the output terminal of the second photoisolator afterwards, the negative electrode of described diode D3 connects+5V supply voltage, the anode of diode D4 and grounding connection, as shown in Figure 4, described pure load circuit comprises 12 resistance be connected in parallel, comprising 4 40 Ω resistance, 6 80 Ω resistance, 1 160 Ω resistance, 1 320 resistance.Integration test control module is given an order, Phototube Coupling is carried out by the second photoelectrical coupler (adopting TLP250 opto-coupler chip), then the duty of igbt transistor amplifying circuit is controlled, thus control 12 road pure resistor loads, the output size of electric current is controlled through 12 pure resistor load combinations be connected in parallel, supply test charging set functional characteristic uses, the electric current that pure resistor load circuit exports carries out sample conversion through current transformer and becomes into corresponding magnitude of voltage, then after the second filtering circuit filtering exclusive PCR, deliver to integration test control module and carry out simulating signal conversion digital signal, carry out data processing again, its magnitude of voltage exported and current value is tested by the input state changing charging set, detecting the ripple factor of charging set by starting ripple sampling unit, being detected the precision of voltage regulation and the precision of steady current of charging set by load regulation unit and input and output voltage sampling unit, test terminates by upper computer software generating report forms, as shown in table 1, and assesses charging set performance index.
Table 1 charging set performance test data
As shown in Figure 5, described DC voltage regulation unit comprises and at least comprises two-way latch output unit, described latch output unit comprises direct current rearrangeable switch power supply I, first latch, first relay array, first electric resistance array, second latch, second relay array, second electric resistance array and the first toggle switch group, described insulating check control module is connected with the first latch and the second latch respectively, described first latch is successively by the first relay array, first electric resistance array is connected with the first toggle switch group, described second latch is successively by the second relay array, second electric resistance array is connected with the first toggle switch group, described insulating check control module is also connected with direct current rearrangeable switch power supply I by RS485 data communication interface, described direct current rearrangeable switch power supply I is also connected with the first toggle switch group.Given an order by insulating check control module, the adjustment that direct current rearrangeable switch power supply I carries out voltage is input to by RS485 data communication interface, can realize exporting DC voltage DC scope and be: 0 ~ 300V, supply straight-flow system insulated on-line monitoring equipment or portable earthing searching equipment equipment under test voltage tester direct current are altered mutually, control the access of the first and second electric resistance arrays by controlling the first switches set, supply verification equipment under test resistance test uses, composition graphs 1 and Fig. 5, in embodiments of the present invention, described DC voltage regulation unit sends control command by insulating check control module, first latch and the second latch receive order, control the disconnection of the first relay array and the second relay array and close, combination capacitance-resistance array, realize DC earthing by selecting the first toggle switch group to export, such as by selecting toggle switch S40, S41 realizes plus earth, select toggle switch S42, S43 realizes minus earth, by the disconnection of pilot relay array and closed thus to be grounded Standard resistance range be 0 ~ 999.9K Ω, ground capacitance scope is 0 ~ 999uF, by selecting the first toggle switch group to realize one pole single-point grounding, one pole multipoint earthing, the two poles of the earth with resistance ground connection or/and the different resistance ground connection in the two poles of the earth,
As shown in Figure 6 and Figure 7, described capacitance-resistance array element comprises 16 road electric resistance arrays, 16 road capacitor arrays, relay array, TLP512-4 opto-coupler chip, insulating check CPU gives an order, pilot relay array after TLP512-4 opto-coupler chip Phototube Coupling, control the closed and disconnected of each relay, thus the combination of controlling resistance array and capacitor array, realize the adjustment of a road resistance, range of adjustment: 0 ~ 999.9K Ω, the adjustment of a road electric capacity, range of adjustment: 0 ~ 999uF, supply analog DC system insulation reduces and ground connection uses, in figure 6, what electric resistance array adopted is that 16 road resistance of different resistance size are connected in series, one or several resistance of each route are connected with an adjustable resistance (RW1 ~ RW16) and are carried out combining and obtain, then by each road resistance switch (altogether 16 switch: K1 ~ K16) in parallel again, Fig. 6 breaker in middle is relay (K1 ~ K16), the size of each roadlock value is combined by resistance and is controlled by a relay, relay closes (one of them of relay K 1 ~ K16 closes) then represents corresponding resistance not to be had in connecting system, in the resistance connecting system of its correspondence after relay disconnects (one of them of relay K 1 ~ K16 disconnects), by the open combinations of relay, can realize resistance value size is that 0 ~ 999.9K Ω combines, be illustrated in figure 7 capacitor array, what capacitor array adopted is that 16 road electric capacity of different capacitance size are connected in parallel, one or several electric capacity of each route and combination and obtain, then to be connected again a switch (altogether 16 switch: S1 ~ S16) by each road electric capacity, Fig. 7 breaker in middle is relay (S1 ~ S16), the capacitor combination of each capacitance size and being controlled by a relay, relay disconnects then corresponding electric capacity not connecting system, in the electric capacity connecting system of relay closes then its correspondence, by the closed combination of relay, can realize capacitance size is 0 ~ 999uF combination.
As shown in Figure 8, described alternating voltage regulon comprises direct current rearrangeable switch power supply II, direct current rearrangeable switch power supply III, 3rd photoisolator, 3rd driving circuit, 3rd protective circuit of voltage regulation, 3rd contact transtat and the second toggle switch group, described insulating check control module is successively by the 3rd photoisolator, 3rd driving circuit, 3rd protective circuit of voltage regulation, 3rd contact transtat connects, described 3rd contact transtat is connected with the second toggle switch group by balance resistance R3, described insulating check control module is connected with direct current rearrangeable switch power supply II and direct current rearrangeable switch power supply III respectively by RS485 data bus, described direct current rearrangeable switch power supply II and direct current rearrangeable switch power supply III are all distinguished the second toggle switch group and are connected, in the present invention, described 3rd protective circuit of voltage regulation comprises diode D5 and diode D6, the anode of described diode D6 is connected with the negative electrode of diode D5 and is connected with the output terminal of the 3rd driving circuit afterwards, and the negative electrode of described diode D6 connects+5V supply voltage, the anode of diode D5 and grounding connection.In the present invention, control command is sent by insulating check control module, export pwm control signal on the one hand to the 3rd photoisolator (adopting TLP512-4 opto-coupler chip), export to the 3rd driving circuit (adopting L298N motor drive ic) again, then control the embedded DC speed-reducing of the 3rd contact transtat by L298N motor drive ic to rotate, send the signal command of PWM regulable control by insulating check control module to control motor drive ic L298N and export different level and realize rotating and reverse of motor, thus the range of adjustment realizing voltage is: the output of 0 ~ 300V alternating voltage, supply analog AC is scurried into DC voltage and is used.Output AC voltage is through protective resistance R3; the second toggle switch group is selected to carry out selecting the voltage realizing exporting with direct current rearrangeable switch power supply II and direct current rearrangeable switch power supply III to go here and there mutually again; realize direct current by selecting the second toggle switch group and alter output mutually; such as by selecting waved switch S50, S52, S55 to realize going here and there mutually between positive voltage, waved switch S51, S53, S54 is selected to realize going here and there mutually between negative voltage.In embodiments of the present invention, the model that direct current rearrangeable switch power supply I, direct current rearrangeable switch power supply II and direct current rearrangeable switch power supply III adopt is HSPY-300-01, can realize exporting DC voltage DC scope and be: 0 ~ 300V, supply equipment under test voltage tester and looped network test use.In inventive embodiments, utilize insulating check module calibration voltage Threshold Crossing Alert functional test: user selects to need the pattern (plus earth or minus earth or the two poles of the earth ground connection) of verification on the first host computer, then the size of the grounding resistance of needs is inputted: 0-999.9K Ω, high out-of-limit low out-of-limit with voltage by the voltage of the first host computer setting equipment under test, then test is started, insulating check control module is given an order, control direct current rearrangeable switch power supply I, direct current rearrangeable switch power supply II and direct current rearrangeable switch power supply III carry out voltage-regulation output, and check equipment under test whether acousto-optic report to the police (whether equipment under test and insulation line monitoring device or portable earthing searching equipment have audible alarm and LED lamplight alarm indication), according to the size of the magnitude of voltage of prompting typing equipment under test direct bearing display, verification terminates, first host computer generates verification form, as shown in table 2,
Table 2 voltage out-of-limit detects data
In inventive embodiments, utilize insulating check module to verify insulation to decline or earthing wire-selecting functional test, user selects the pattern (plus earth or minus earth or the two poles of the earth ground connection) needing verification on the first host computer, then inputs the size of the grounding resistance of needs: 0-999.9K Ω, insulating check control module controls direct current rearrangeable switch power supply I according to the magnitude of voltage that user inputs, direct current rearrangeable switch power supply II and direct current rearrangeable switch power supply III carry out voltage-regulation output, insulating check control module carries out the switching of pattern and the output of resistance according to the closed of grounding resistance size pilot relay of user-selected checking mode and input, on current output line, produce leakage current simultaneously, after starting test, check that whether the route selection function of equipment under test is normal, whether resistance display precision is qualified, after insulating check terminates, the test parameter generating report forms that first host computer inputs according to user exports, as shown in table 3,
Table 3 ground connection and route selection function check data
User selects the pattern (plus earth or minus earth or the two poles of the earth ground connection) needing verification on the first host computer, then inputs the size of the grounding resistance of needs: 0 ~ 999.9K Ω, insulating check control module controls direct current rearrangeable switch power supply I according to the magnitude of voltage that user inputs, direct current rearrangeable switch power supply II and direct current rearrangeable switch power supply III carry out voltage-regulation output, insulating check control module carries out the switching of pattern and the output of resistance according to the closed of grounding resistance size pilot relay of user-selected checking mode and input, on current output line, produce leakage current simultaneously, after starting test, check that whether the route selection function of equipment under test is normal, whether resistance display precision is qualified, after insulating check terminates, the test parameter generating report forms that first host computer inputs according to user exports.
In inventive embodiments, utilize insulating check module to carry out interchange and alter electricity verification, the first host computer is selected interchange scurry into direct current verifying function, the polarity of direct current and the size of alternating voltage are scurried in input; Insulating check control module is given an order, control L298N motor drive ic drive motor action, regulates alternating voltage magnitude range to be 0-300V; User by selecting first toggle switch group and the second toggle switch group, realize positive pole or negative pole that alternating voltage scurries into direct current, by display and the warning of equipment under test, according to the display voltage swing of the prompting typing equipment under test of the first host computer, first host computer automatic report generation after detection completes, Electricity Functional and precision size are altered in the interchange of display equipment under test, and it is as shown in table 4 that direct current checking data is scurried in interchange.
Table 4 exchanges and scurries into direct current checking data table
Composition graphs 9, in embodiments of the present invention, detect that voltage both positive and negative polarity resistance value over the ground determines the size of distributed capacitance over the ground by loop method, the described test cell of distributed capacitance over the ground comprises the second bleeder circuit, 3rd filtering circuit, 3rd protective circuit of voltage regulation, first voltage amplifier circuit, one A/D digital to analog converter, 3rd bleeder circuit, 4th filtering circuit, 4th protective circuit of voltage regulation, second voltage amplifier circuit, 2nd A/D digital to analog converter, detecting bridge and current compensation circuit, one end of described second bleeder circuit is connected with the positive pole of straight-flow system bus output voltage, and the other end of the second bleeder circuit is successively by the 3rd filtering circuit, 3rd protective circuit of voltage regulation, first voltage amplifier circuit and an A/D digital to analog converter are connected with parametric test control module over the ground, and one end of described 3rd bleeder circuit is connected with the negative pole of straight-flow system bus output voltage, and the other end of the 3rd bleeder circuit is successively by the 3rd bleeder circuit, 4th filtering circuit, 4th protective circuit of voltage regulation, second voltage amplifier circuit, 2nd A/D digital to analog converter is connected with parametric test control module over the ground, the input end of described detecting bridge is connected with the negative pole of straight-flow system bus output voltage and positive pole respectively, and the output terminal of described detecting bridge is connected with parametric test control module over the ground.A described A/D digital to analog converter and the 2nd A/D digital to analog converter adopt ADS1232 modulus conversion chip, and described D/A analog to digital conversion adopts DAC7513 chip.Described second bleeder circuit comprises resistance R4 and resistance R5, 3rd filtering circuit comprises resistance R6 and electric capacity C1, 3rd protective circuit of voltage regulation comprises diode D7 and diode D8, described first voltage amplifier circuit comprises operational amplifier A 1, one end of described resistance R4 is connected with the positive pole of straight-flow system bus output voltage, be connected in series with the other end of resistance R4 again after one end of described resistance R5 and one end of resistance R6 are connected in parallel, the described resistance R6 other end is connected with the positive input terminal of operational amplifier A 1, one end of described electric capacity C1 and the anode of diode D7, be connected with the other end of resistance R6 again after the negative electrode connection of diode D8, the other end of described resistance R5 and the other end of electric capacity C1 are connected to ground respectively, the negative electrode of diode D7 is connected with+3.3V power supply, the anode of described diode D8 and the negative input of operational amplifier A 1 are connected to ground respectively, the output terminal of described operational amplifier A 1 is connected with parametric test control module over the ground, described 3rd bleeder circuit comprises resistance R7 and resistance R8, 3rd filtering circuit comprises resistance R9 and electric capacity C2, 4th protective circuit of voltage regulation comprises diode D9 and diode D10, described second voltage amplifier circuit comprises operational amplifier A 2 and operational amplifier A 3, one end of described resistance R7 is connected with the negative pole of straight-flow system bus output voltage, be connected with resistance R7 again after one end of described resistance R8 is connected with one end of resistance R9, the other end of described resistance R9 is connected with the positive input terminal of operational amplifier A 2, one end of described electric capacity C2 and the anode of diode D9, be connected with the other end of resistance R9 again after the negative electrode connection of diode D10, the negative electrode of described diode D9 is connected with 3.3V power supply, the other end of described resistance R8, the other end of electric capacity C2, the anode of diode D10 is connected to ground respectively, the output terminal of described operational amplifier A 2 is connected with the electrode input end of operational amplifier A 3 negative input and operational amplifier A 2 respectively, the output terminal of described operational amplifier A 3 is connected with parametric test control module over the ground by the second A/D converter, the negative input of described operational amplifier A 2 and the electrode input end of operational amplifier A 3 are connected to ground all respectively.
Composition graphs 9, in embodiments of the present invention, described current compensation circuit comprises D/A analog to digital converter, resistance R10, electric capacity C3, resistance R11 and electric capacity C4, operational amplifier A 4, operational amplifier A 5, positive-negative-positive triode SA1009 and NPN type triode C2333, parametric test control module output detections signal is changed by D/A analog to digital converter over the ground, one end of described resistance R10 is connected with one end of electric capacity C3 and is connected with D/A analog to digital converter afterwards, the other end of described resistance R10 is connected with the electrode input end of operational amplifier A 4, the output terminal of operational amplifier A 4 is connected with the base stage of positive-negative-positive triode SA1009, the collector of positive-negative-positive triode SA1009 is connected with the negative pole of straight-flow system bus output voltage by balance resistance R13, one end of described resistance R11 is connected with one end of electric capacity C4 and is connected with D/A analog to digital converter afterwards, the other end of described resistance R11 is connected with the electrode input end of operational amplifier A 5, the output terminal of operational amplifier A 5 is connected with the base stage of NPN type triode C2333, the collector of NPN type triode C2333 is connected with the positive pole of straight-flow system bus output voltage by balance resistance R12, the other end of described electric capacity C3, the other end of electric capacity C4, the negative input of operational amplifier A 4, the negative input of operational amplifier A 5, the emitter of positive-negative-positive triode SA1009 and the emitter of NPN type triode C2333 are connected to ground all respectively.
Composition graphs 9, described detecting bridge comprises relay K M1, relay K M2, resistance R14 and resistance R15, original state resistance R14 and resistance R15 is in ground state, relay K M1, relay K M2 is in off-state, CPU control module is only connected with relay K M1 and relay K M2 respectively, because relay K M1 and relay K M2 is made up of coil and switch, the coil of relay K M1 and relay K M2 links together with CPU control module respectively, switch one end of relay K M1 is connected with the positive pole of straight-flow system bus output voltage, the switch other end of relay K M1 is connected with one end of resistance R14, the other end ground connection of resistance R14, switch one end of relay K M2 is connected with the negative pole of straight-flow system bus output voltage, the switch other end of relay K M2 is connected with one end of resistance R15, the other end ground connection of resistance R15, after parametric test control module exports out high level over the ground, the coil of relay K M1 and relay K M2 produces magnetic force, switch is closed, over the ground after parametric test control module output low level, the coil magnetic force of relay K M1 and relay K M2 disappears, switch disconnects, one-time detection bridge is started during each start, latter two relay detected just disconnects, when Bus Voltage deviation can detect by start detection bridge again more than equipment during 15V.
Composition graphs 9, in embodiments of the present invention, when start to carry out over the ground branch's capacitance detecting time, parametric test control module exports by start detection bridge over the ground, positive-negative-positive triode SA1009, NPN type triode C2333 enters duty, and small-signal current is injected in straight-flow system bus, the positive voltage of straight-flow system and negative voltage is caused to change over the ground, in change moment, straight-flow system over the ground branch's electric capacity has slight change in voltage, straight-flow system voltage-to-ground is respectively by after the second bleeder circuit and the 3rd bleeder circuit, through respective RC second-order low-pass filter circuit, signal is given to an A/D digital to analog converter and the 2nd A/D digital to analog converter respectively again to carry out simulating signal and be converted to digital signal, input parametric test control module over the ground and carry out data processing, when parametric test control module exports the electrical voltage point gathered over the ground, start start detection bridge and start timing detect time, timing is to the time after change in voltage is stablized always, then according to the size of formula τ=RC computing system distributed capacitance over the ground, meanwhile, the parametric test control module data of being sent back to by computation and analysis the one A/D digital to analog converter and the 2nd A/D digital to analog converter over the ground, and the calculating of system resistance to earth and system distributed capacitance is carried out according to the size of detecting bridge, by LCD display unit, the relevant information of system is shown after having calculated, and outputting alarm signal, now, according to the pattern of work, parametric test control module exports the fixing compensating current signal of a frequency to straight-flow system bus over the ground, this current signal is through parametric test control module output digit signals over the ground, filtering is carried out respectively through the RC low-pass filter circuit be made up of resistance R10 and electric capacity C3 and R11 and C4 after digital signal being converted to simulating signal by D/A analog to digital converter again, then through voltage amplifier circuit, simulating signal is carried out amplification process, in straight-flow system, this compensating current signal is provided finally by positive-negative-positive triode SA1009 and NPN type triode C2333, now system failure point can produce the leakage current signal of a fixed frequency, parametric test control module sends data to the first wireless communication module over the ground, by the first wireless module data are sent to above detection instrument and receive, the size of straight-flow system bus distributed capacitance detected value is over the ground provided.
The electrical voltage point high-speed sampling unit of distributed capacitance module, by start detection bridge, the positive and negative voltage-to-ground of straight-flow system bus has the process of a change, in the process of this change in voltage, adopt the high-speed sampling of electrical voltage point, sample frequency is 100ms, sampling required time is voltage-to-ground and stablizes rear institute's sample voltage value and the time needed for voltage stabilization, then off resistance R14 and resistance R15, straight-flow system Bus Voltage can change, use the same method sampling, obtain the another one time, then data are delivered to parametric test control module over the ground and carry out data analysis, by the distributed capacitance of this system of discharge time constant formulae discovery of electric capacity, and carry out risk assessment to the second host computer according to these data, finally provide a Risk Assessment Report by the second host computer.
In conjunction with Figure 10, in embodiments of the present invention, described earthing detection and failure location unit comprise the 5th filtering circuit, current amplification circuit, the 3rd A/D converter, the second wireless communication module and electric current split-core type meter, the cathode output end of described electric current split-core type meter is connected with parametric test control module over the ground by the 5th filtering circuit, current amplification circuit, the 3rd A/D converter successively, the model employing NRF24L01 wireless communication module of described second wireless communication mould, in embodiments of the present invention, described filtering circuit comprises resistance R16, electric capacity C5, current amplification circuit comprises resistance R17, electric capacity C6 and computing comparer A6, one end of described resistance R16 is connected with the cathode output end of electric current split-core type meter, be connected with the other end of resistance R16 after described electric capacity C1 one end is connected with one end of resistance R17, one end of described electric capacity C6 is connected with the resistance R17 other end and is connected with the electrode input end of computing comparer A6 afterwards, the output terminal of described computing comparer A6 is connected by the 3rd A/D converter and is connected with parametric test control module over the ground, the negative input of described computing comparer A1, the other end of the electric capacity C5 other end and electric capacity C6 is connected to ground all respectively, described computing comparer A1 adopts OP07 chip, in embodiments of the present invention, the leakage current in DC feeder bus is gathered by electric current split-core type meter, through the filtering circuit filtering interfering be made up of resistance R16 and electric capacity C5, after an OP07 computing comparer carries out current following amplification, give parametric test control module over the ground after analog signal converter being carried out converting digital signal to by the 3rd A/D converter and carry out data processing, parametric test control module is by giving an order over the ground, by the 3rd A/D converter ADS1232 analog to digital converter, analog current signal being converted to digital signal signal sends to parametric test control module over the ground to carry out data processing and contrast, fault ground resistance size is finally drawn by calculating, and carry out showing and the relative direction showing earth fault and the waveform change curve shown in DC feeder bus at LCD display unit, after the same method each root feeder line is carried out to the detection of leakage current, know and navigate to trouble spot, if the interference that this circuit exists is larger, can avoid interference by regulating electric current split-core type meter signal amplitude and frequency, simultaneously can also send control command by parametric test control module over the ground, by the second wireless module NRF24L01 Received signal strength, supply positioning both ground trouble spot uses, can realize the location of out of order detection and fault.
The foregoing is only the preferred embodiment of invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a direct current comprehensive test platform, is characterized in that: comprise the first host computer, second host computer, integration test module, insulating check module, parametric test module over the ground, data communication interface and supply module, described first host computer by data communication interface to integration test module, insulating check module and over the ground parametric test module carry out controlling and to gather the data analysis process returned, described integration test module is used for test input output voltage, electric current, and ripple factor collection, and carry out analyzing and processing and be uploaded to the first host computer, described insulating check module is used for the electric current of external input device, voltage, impedance verifies, and by data upload to the first host computer of verification, the described module of parametric test is over the ground used for the ground capacitance distribution in test macro, Earth design is searched, insulation against ground decline degree, and the data upload to the first of test host computer is carried out analyzing and processing, and tested data upload to the second host computer is carried out risk assessment, described supply module is integration test module, insulating check module and over the ground parametric test module provide working power.
2. a kind of direct current comprehensive test platform according to claim 1, it is characterized in that: described integration test module comprises integration test control module, three-phase voltage regulon, load regulation unit, ripple sampling unit and input and output voltage sampling unit, described integration test control module respectively with three-phase voltage regulon, load regulation unit, ripple sampling unit is connected with input and output voltage sampling unit, described input and output voltage sampling unit is also connected with three-phase voltage regulon, described insulating check module comprises insulating check control module, capacitance-resistance array element, DC voltage regulation unit and alternating voltage regulon, described insulating check control module respectively with capacitance-resistance array element, DC voltage regulation unit is connected with alternating voltage regulon, the described module of parametric test over the ground comprises parametric test control module over the ground, distributed capacitance test cell over the ground, earthing detection and failure location unit and LCD display unit, the described control module of parametric test over the ground respectively with branch's capacity measurement unit over the ground, earthing detection and failure location unit are connected with LCD display unit.
3. a kind of direct current comprehensive test platform according to claim 2, it is characterized in that: described input and output voltage sampling unit comprises the first voltage rectifier, first bleeder circuit and the first filtering circuit, described three-phase voltage regulon comprises the first contact transtat, first driving circuit, first photoisolator and the first protective circuit of voltage regulation, the identification voltage that the adjustable transformation of described first contact exports is by passing through the first voltage rectifier successively, first bleeder circuit and the first filtering circuit input integration test control module carry out identifying processing, the pwm signal that described integration test control module exports after identifying processing is successively by the first photoisolator, first driving circuit and the first protective circuit of voltage regulation feed back input to the first contact transtat.
4. a kind of direct current comprehensive test platform according to claim 2, it is characterized in that: described load regulation unit comprises pure resistor load circuit, igbt transistor amplifying circuit, second protective circuit of voltage regulation, second photoisolator, second filtering circuit summation current transformer, described pure resistor load circuit is connected with integration test control module with the second filtering circuit by current transformer successively, the signal that described integration test control module exports is successively by the second photoisolator, second protective circuit of voltage regulation and igbt transistor amplifying circuit feed back input are to pure load circuit.
5. a kind of direct current comprehensive test platform according to claim 4, is characterized in that: described pure load circuit at least comprises 12 resistance be connected in parallel, and wherein at least comprises 4 40 Ω resistance, 6 80 Ω resistance, 1 160 Ω resistance, 1 320 resistance.
6. a kind of direct current comprehensive test platform according to claim 2, it is characterized in that: described DC voltage regulation unit comprises and at least comprises two-way latch output unit, described latch output unit comprises direct current rearrangeable switch power supply I, first latch, first relay array, first electric resistance array, second latch, second relay array, second electric resistance array and the first toggle switch group, described insulating check control module is connected with the first latch and the second latch respectively, described first latch is successively by the first relay array, first electric resistance array is connected with the first toggle switch group, described second latch is successively by the second relay array, second electric resistance array is connected with the first toggle switch group, described insulating check control module is also connected with direct current rearrangeable switch power supply I by RS485 data bus, described direct current rearrangeable switch power supply I is also connected with the first toggle switch group.
7. a kind of direct current comprehensive test platform according to claim 2, it is characterized in that: described alternating voltage regulon comprises direct current rearrangeable switch power supply II, direct current rearrangeable switch power supply III, 3rd photoisolator, 3rd driving circuit, 3rd protective circuit of voltage regulation, 3rd contact transtat and the second toggle switch group, described insulating check control module is successively by the 3rd photoisolator, 3rd driving circuit, 3rd protective circuit of voltage regulation, 3rd contact transtat connects, described 3rd contact transtat is connected with the second toggle switch group by balance resistance R3, described insulating check control module is connected with direct current rearrangeable switch power supply II and direct current rearrangeable switch power supply III respectively by RS485 data bus, described direct current rearrangeable switch power supply II and direct current rearrangeable switch power supply III are all distinguished the second toggle switch group and are connected.
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| CN107677901A (en) * | 2017-08-28 | 2018-02-09 | 国网上海市电力公司 | Transforming plant DC power-supply system electric energy quality assessment device and appraisal procedure |
| CN107728025A (en) * | 2017-10-27 | 2018-02-23 | 无锡七百二十度科技有限公司 | A kind of system for monitoring high-tension switch cabinet shelf depreciation on-line |
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