CN201984112U - Full-automatic load box tester - Google Patents
Full-automatic load box tester Download PDFInfo
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- CN201984112U CN201984112U CN 201120042879 CN201120042879U CN201984112U CN 201984112 U CN201984112 U CN 201984112U CN 201120042879 CN201120042879 CN 201120042879 CN 201120042879 U CN201120042879 U CN 201120042879U CN 201984112 U CN201984112 U CN 201984112U
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- load box
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- power supply
- automatic load
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Abstract
The utility model discloses a full-automatic load box tester, comprising a PC machine, wherein the utility model further comprises a DSP control module, an AD sampling module, a D/A switching module and a numerical control linear power supply; the PC machine is communicated with the DSP control module via a CAN bus; the DSP control module is connected with the D/A switching module; the D/A switching module is connected with the numerical control linear power supply; the numerical control linear power supply is connected with the load box to be tested to transmit stable voltage signal; the load box to be tested is connected with the AD sampling module; and the AD sampling module is connected with the DSP control module. The utility model solves the problem that the load box checking instrument has lower precision, insufficient displaying digit and slow testing speed in the prior art. The utility model provides a device for automatically testing the high precision of the load box, and has the functions of storing, issuing and printing the report.
Description
Technical field
The utility model relates to the relevant load box test automatic detection device of a kind of electric-power metering, and whether the error precision grade that can detect current loading case, voltage load box meets relevant standard, belongs to electric system Measuring and testing technical field.
Background technology
Efficiency ratio is lower in the tester of the calibrating of the load box use at present process, the wiring more complicated.The precision of original tester and figure place showing deficiency, the detection of original Burden box has two kinds of methods: a kind of is to adopt electrician's formula mutual inductor tester whole checking platform, this kind method measuring accuracy height, measurement range is also than broad, but test speed is slow, and the checking electronic type transformers platform does not generally have the function that the measurement Burden box is particularly measured the high capacity Burden box.Another kind method needs external pressure regulator current lifting device, isolated voltage transformer etc., and, cause measuring result error bigger because the precision of mutual-inductor tester itself is not high.Two kinds of methods all exist same problem, can not provide various forms or certificate, and data backup is safeguarded and all exist bigger problem with being connected of electric power mis system.For all the foregoing reasons, for require 1 year one the inspection Burden box, each DianKeYuan, power office, various places Administration of Quality and Technology Supervision all feel to examine and determine with the verification Burden box be a job of wasting time and energy.
The utility model content
In order to solve the problem that load box tester measuring accuracy is lower in the prior art, figure place showing is not enough, test speed is slow.The utility model provides a kind of and can realize load box high precision and the device that can test automatically, and has functions such as form stores, provides, printing.
The principle of work of the full-automatic load box tester of the utility model:
Estimated current, voltage load box all are to adopt electrician's formula principle, obtain the size of corresponding impedance and admittance by the series system of resistance and inductance.
In order accurately to measure the impedance of current loading case, export a stable current signal to the connection terminal of current loading case by control numerical control linear power supply, size by the voltage signal on the AD sampling module sampling connection terminal and with the differential seat angle of current signal, can calculate the size of corresponding resistance and reactance.
For the accurately admittance of measuring voltage load box, export a stable voltage signal to the connection terminal of voltage load box by control numerical control linear power supply, size by the current signal in the AD sampling module sampling circuit and with the differential seat angle of voltage signal, can calculate corresponding electricity and lead size with susceptance.
After using the AD sampling module to sample the size of voltage and current signal, can calculate the differential seat angle of two paths of signals, calculate the size that to obtain impedance and admittance by corresponding trigonometric function by the fast Flourier fft algorithm.
For example:
Suppose that the voltage that samples is U, electric current is I, and phase differential is a (unit is degree);
The current loading case:
Resistance R=U/I*COSa;
Reactance X=U/I*SINa;
Voltage load box:
Electricity is led G=I/U*COSa;
Susceptance B=-I/U*SINa;
In order to achieve the above object, technical solution adopted in the utility model is:
A kind of full-automatic load box tester, comprise PC, it is characterized in that: also comprise DSP control module, AD sampling module, D/A modular converter, numerical control linear power supply, described PC is communicated by letter with the DSP control module by the CAN bus, described DSP control module is connected with the D/A modular converter, described D/A modular converter is connected with the numerical control linear power supply, described numerical control linear power supply is connected with load box to be measured carries stable voltage signal, described load box to be measured is connected with the AD sampling module, and the AD sampling module is connected with the DSP control module.
Aforesaid a kind of full-automatic load box tester, it is characterized in that: described PC comprises human-computer interaction interface, database module, communication module, MIS interface module.
Aforesaid a kind of full-automatic load box tester is characterized in that: described DSP control module adopts the LF2407A chip.
Aforesaid a kind of full-automatic load box tester is characterized in that: described AD sampling module adopts 14 MAX125 chip, has 8 passage synchronized sampling functions.
Aforesaid a kind of full-automatic load box tester is characterized in that: described D/A modular converter adopts 14 AD7538 chip, is used for the output voltage size of regulating and controlling numerical control linear power supply.
Aforesaid a kind of full-automatic load box tester is characterized in that: the numerical control linear power supply adopts monolithic processor controlled triode Class A amplification mode, is provided with 0-5V analog input interface, and output voltage is proportional to input voltage.
Aforesaid a kind of full-automatic load box tester, it is characterized in that: the USB interface of described PC is connected with the USB interface of USB-CAN change-over panel, and the CAN bus interface of described USB-CAN change-over panel is connected with the CAN interface of DSP control module.
The beneficial effects of the utility model are: full-automatic load box tester is to be man machine operation interface with the personal computer PC, is controller with the digital signal processor DSP, is the self-operated measuring unit of driving source with digital program controlled linear power supply.Full-automatic load box tester adopts brand-new design, and pressure regulator, current lifting device, isolated voltage transformer are combined together, has also enlarged range ability simultaneously.In the process of calibrating Burden box, do not need external any equipment, wiring is also very simple, and this instrument host computer is PC simultaneously, adopts big screen LCD, and intuitive display is easy to operate; Upper management software adopts Database Systems, and stores test results is provided form easily; Reserve the mis system interface, can with upper mis system seamless link.
Description of drawings
The system construction drawing of the full-automatic load box tester of Fig. 1 the utility model;
The software pie graph of the full-automatic load box tester of Fig. 2 the utility model;
Fig. 3 the utility model main circuit block diagram;
Fig. 4 the utility model calculation of parameter theory diagram;
Fig. 5 the utility model CAN bus communication circuit block diagram;
Fig. 6 the utility model DA partial circuit schematic diagram;
Fig. 7 the utility model AD partial circuit schematic diagram.
Embodiment
The utility model will be further described below in conjunction with accompanying drawing.
As shown in the figure, full-automatic load box tester comprises PC, DSP control module, AD sampling module, D/A modular converter, numerical control linear power supply.
Upper PC mainly comprises supervision test software, bitcom.Supervision test software comprises human-computer interaction interface, database module, communication module, MIS interface module of test etc. again.
Human-computer interaction interface adopts the VS development system, has the look ﹠ feel and the mode of operation of WINDOWS standard, corresponding any people that can use the WINDOWS system computer, the operation of grasp test that soon can be skilled.
Bitcom adopts the CAN bussing technique of industrial field bus, and CAN-bus (Controller Area Network) is a controller local area network, is one of most widely used open field bus in the world.As a kind of advanced technology, reliability height, perfect in shape and function, the rational telecommunication network Communication Control of cost mode, CAN-bus has been widely applied in each automation control system.For example, in each fields such as automotive electronics, automation, intelligent building, electric system, safety monitoring, boats and ships sea-freight, elevator control, security against fires, CAN-bus has incomparable superiority.
CAN-bus is with the low cost of its development and maintenance, high total line use ratio, far transmission range (can reach 10Km farthest), transfer rate (reaching as high as 1Mbps) at a high speed, the many main structures according to priority, reliable error-detecting and treatment mechanism, remedied the deficiency of low total line use ratio of traditional RS-485 network, single host-guest architecture, the detection of no hard error comprehensively, make the user can set up stable, field bus control system efficiently, thereby produce maximum actual value.
The utility model CAN fieldbus, interface chip are the PCA82C250 of Philip.The CAN bus adopts the mode transmission signals of two line difference, the speed of signal adopts nondestructive bus arbitration technology up to the 1Mbps.CAN bus, signal on the bus is arbitrated according to the priority that sends chip, the elder generation that priority is high is sent out, priority is low back, hardware mode is adopted in whole arbitration, and need not software intervention can finish.Adopt the mode of packet, every bag is the data of 8 bytes of transmission at most, both can satisfy the requirement of general data amount, also can not take too many bus time, meet the requirement of bus real-time.Change by USB interface of computer, so long as there is the computing machine of USB interface to use very easily.And the CAN bus has characteristics such as reliability height, data transmission is fast, agreement is open, is very suitable for the communication of electric system.
Database module adopts popular SQL system of Microsoft, has compatible good, high reliability features, can cooperate with the data-interface of the overwhelming majority.
The MIS interface adopts the general standard of electric system, and is easy to use.
The utility model DSP control module adopts the LF2407A of general 2000 series of TI company, and speed is 40M, has abundant peripheral unit, comprises interfaces such as CAN bus module, serial port module, IO interface, SPI.
The utility model AD sampling module: prime is used the voltage and current mutual inductor of 0.1% precision, modulate circuit adopts the resistance of high-operational amplifier TLC2652 and 0.05%, program control amplification and active filter circuit through ADG409, sent handling the signal that meets the amplitude requirement into 14 MAX125 chip, the MAX125 chip has 8 passage synchronized sampling functions, and sampling precision is greater than 0.05%.The phase-locked loop circuit that sample frequency control adopts CD4046 and CD4020 to form amplifies 64 times with signal frequency, and promptly sample frequency is 3.2KHZ.
The utility model D/A modular converter adopts the generation of AD9851 signal, OP285 amplifier and AD7538.AD9851 is the direct frequency synthesis of high-precision DDS() chip, can produce that frequency stabilization is adjustable, the sinusoidal signal of amplitude stability, control output amplitude by the reference signal size of adjusting AD7538,14 DA has 2^14 in theory, i.e. 1/16384 precision, can regulate the output voltage size of numerical control linear power supply accurately, the assurance of stability and accuracy is provided for measurement.
PLD programmable gate array device adopts the XC95144 of XILINX, makes things convenient for the expansion and the address decoding of bus and IO mouth.
The utility model numerical control linear power supply adopts monolithic processor controlled triode Class A amplification mode, adopts 0-5V analog input interface, and output voltage is proportional to input voltage.By monolithic processor controlled closed loop working method, can stablize, the precise output voltage signal, got rid of the voltage output instability problem that power-supply fluctuation, load and temperature variation are brought.
During work, the supervision test software on the PC carries out the exchange of data, instruction by communication module and DSP control module.Supervision test software has been selected after corresponding load box specification, range, the angle, and data down transmission is arrived control panel.DSP control module on the control panel receives after the data, size and frequency by control D/A arrive the numerical control linear power supply, the numerical control linear power supply plays the effect of a power amplifier, the AC signal of 0-5V is amplified to the AC signal of 0-120V, and the power output capacity about 200VA is arranged, can satisfy 5A, 1A, 100V, 100/3V, the load box power requirement of specifications such as 100/1.732V.
The verification course of work of the full-automatic load box tester of the utility model is as follows:
According to the accuracy class (being generally 3 grades) of load box, calculate the size of the data of each gear, tabulating.
By this full-automatic load box tester load box is measured, PC is inserted form with data automatically, and the demonstration (red expression is defective, and black is represented qualified) by different colours, and it is open-and-shut whether satisfying corresponding accuracy requirement.
Can directly provide form for the load box that satisfies error requirements, print or store.
More than show and described ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the instructions just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (7)
1. full-automatic load box tester, comprise PC, it is characterized in that: also comprise DSP control module, AD sampling module, D/A modular converter, numerical control linear power supply, described PC is communicated by letter with the DSP control module by the CAN bus, described DSP control module is connected with the D/A modular converter, described D/A modular converter is connected with the numerical control linear power supply, described numerical control linear power supply is connected with load box to be measured carries stable voltage signal, described load box to be measured is connected with the AD sampling module, and the AD sampling module is connected with the DSP control module.
2. a kind of full-automatic load box tester according to claim 1, it is characterized in that: described PC comprises human-computer interaction interface, database module, communication module, MIS interface module.
3. a kind of full-automatic load box tester according to claim 2 is characterized in that: described DSP control module adopts the LF2407A chip.
4. a kind of full-automatic load box tester according to claim 3 is characterized in that: described AD sampling module adopts 14 MAX125 chip, has 8 passage synchronized sampling functions.
5. a kind of full-automatic load box tester according to claim 4 is characterized in that: described D/A modular converter adopts 14 AD7538 chip, is used for the output voltage size of regulating and controlling numerical control linear power supply.
6. a kind of full-automatic load box tester according to claim 5 is characterized in that: the numerical control linear power supply adopts monolithic processor controlled triode Class A amplification mode, is provided with 0-5V analog input interface, and output voltage is proportional to input voltage.
7. a kind of full-automatic load box tester according to claim 6, it is characterized in that: the USB interface of described PC is connected with the USB interface of USB-CAN change-over panel, and the CAN bus interface of described USB-CAN change-over panel is connected with the CAN interface of DSP control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120042879 CN201984112U (en) | 2011-02-21 | 2011-02-21 | Full-automatic load box tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120042879 CN201984112U (en) | 2011-02-21 | 2011-02-21 | Full-automatic load box tester |
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| Publication Number | Publication Date |
|---|---|
| CN201984112U true CN201984112U (en) | 2011-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120042879 Expired - Lifetime CN201984112U (en) | 2011-02-21 | 2011-02-21 | Full-automatic load box tester |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141585A (en) * | 2011-02-21 | 2011-08-03 | 江苏方天电力技术有限公司 | Full-automatic tester for load box |
| CN103778830A (en) * | 2014-01-09 | 2014-05-07 | 广西电网公司电力科学研究院 | Current load box simulator |
| CN108680804A (en) * | 2018-02-01 | 2018-10-19 | 哈尔滨理工大学 | AC and DC resistance load system based on bus marco and control method |
-
2011
- 2011-02-21 CN CN 201120042879 patent/CN201984112U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141585A (en) * | 2011-02-21 | 2011-08-03 | 江苏方天电力技术有限公司 | Full-automatic tester for load box |
| CN103778830A (en) * | 2014-01-09 | 2014-05-07 | 广西电网公司电力科学研究院 | Current load box simulator |
| CN108680804A (en) * | 2018-02-01 | 2018-10-19 | 哈尔滨理工大学 | AC and DC resistance load system based on bus marco and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: JIANGSU ELECTRIC POWER COMPANY STATE GRID CORPORAT Effective date: 20121128 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20121128 Address after: 211102 Su mansion, No. 58 Su Fang Avenue, Jiangning District, Jiangsu, Nanjing Patentee after: Jiangsu Fangtian Power Technology Co., Ltd. Patentee after: Jiangsu Electric Power Company Patentee after: State Grid Corporation of China Address before: 211102 Su mansion, No. 58 Su Fang Avenue, Jiangning District, Jiangsu, Nanjing Patentee before: Jiangsu Fangtian Power Technology Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110921 |