CN1270188C - Fictitious load source for in-situ checking electric energy meter - Google Patents

Fictitious load source for in-situ checking electric energy meter Download PDF

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Publication number
CN1270188C
CN1270188C CN 02113948 CN02113948A CN1270188C CN 1270188 C CN1270188 C CN 1270188C CN 02113948 CN02113948 CN 02113948 CN 02113948 A CN02113948 A CN 02113948A CN 1270188 C CN1270188 C CN 1270188C
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CN
China
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phase
current
circuit
voltage
signal
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CN 02113948
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Chinese (zh)
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CN1435697A (en
Inventor
罗志坤
徐植坚
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湖南省电力试验研究所
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Priority to CN 02113948 priority Critical patent/CN1270188C/en
Publication of CN1435697A publication Critical patent/CN1435697A/en
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Abstract

The present invention relates to an electric energy meter site checking analogue load source which is mainly composed of a zero passage voltage comparison circuit, an alarm unit, a power supply part, a single chip computer system, an amplifying circuit of electric current signal phase shifting, a power amplifier output circuit of electric current and a current protection circuit set. Under the condition that a meter is unsuitable to be checked on the spot, through an ac 220V working power supply, a three-phase analogue load testing current source is artificially provided, which solves the problem that errors of operated electric energy meters can be checked on the spot without loads or low current loads and low power factors. The present invention has the advantages of reasonable design, complete function, high intellectualized extent, portability and good performance.

Description

Fictitious load source for in-situ checking electric energy meter
Technical field
The present invention relates to the confession power distribution equipment of electric system, the current-source arrangement of the three-phase electric energy Watch Error on-the-spot test that is specifically related to move on the electrical network.
Background technology
Electric energy measurement technology and instrument play important effect in China's economic construction, its whether accurate direct relation the correct calculation of every electric industry technical indicators such as electric power enterprise generated energy, line loss, coal consumption, station service, delivery, power consumption, relate to country and user's economic benefit, the progressively in-depth of electricity market is simultaneously had higher requirement to electric energy measurement technology and instrument with reform, more and more payes attention to its integrality and accuracy.Each electric power enterprise has been strengthened the operating supervision detection of field electric energy measurement table meter, requirement by " the electric power meter technical management rules DL448-2000 " of electric power enterprise must be carried out 1-3 time on-the-spot test to all important electricity-measuring meters every year, but actual situation about finishing, most of unit is difficult to reach even does not reach at all regulation.Trace it to its cause, bypass some subjective factors artificial or management, single from objective angle analysis, " should not calibration number " proposed below be the key of problem.Stipulate by 4.2.2 article of e money of SD109-83 " electric power meter inspection procedure " that Electricity Department is issued:
On-the-spot bearing power should be actual frequent load.Demarcate 10% or power factor of electric current when being lower than 0.5 when load current is lower than tested electric energy meter, should not carry out the error calibrating.
So the notion of unsuitable calibration has just been arranged, and its number is in continuous increase, the reason of generation mainly contains following several aspect:
1. some enterprise has suspended operations for consolidation or production scale is sharply dwindled and caused power load minimum;
2. the electric energy meter of extension wire or bypass installation is zero load for a long time;
3. line load is for the moment too little can not satisfy the verification requirement;
4. Internet user such as small power station, off line table meter is zero load during online, and online table meter is zero load when off line.
Some is the area seriously, and it should not account for the 30-50% that answers the calibration sum by the calibration number.Therefore should not the calibration problem trouble the every index of each Utilities Electric Co. in varying degrees, thereby influence normally carrying out of electricity market commercialization operation, further have influence on the economic interests of electric power enterprise and power consumer.
Summary of the invention:
Technical matters to be solved by this invention should not the calibration problem provide technological means for effectively eliminating, develop a kind of Fictitious load source for in-situ checking electric energy meter, not restricted by the electricity consumption situation, scene operation electric energy meter is implemented verification termly, ensure normally carrying out and the electric power meter serviceability rate of electric detecting technology supervision work, in time eliminate and find metering hidden danger, improve the measuring apparatus reliability, guarantee to send out, for, electricity consumption three parts's economic interests and legitimate rights and interests.
The technical solution that the present invention adopts is: this Fictitious load source for in-situ checking electric energy meter is made up of voltage zero-cross comparator circuit, alarm unit, power unit, Single Chip Microcomputer (SCM) system, current signal phase shift amplifying circuit, electric current power amplifier output circuit, current protecting circuit.The external 220V working power of this load source, through power unit convert to ± 5V and ± the 30V direct current offers Single Chip Microcomputer (SCM) system, the working power of each electronic circuit and electric current power amplifier output circuit, electric energy metrical screen end case A phase voltage, the B phase voltage, any phase voltage or electric energy meter table meter voltage end in the C phase voltage, input to the voltage zero-cross comparator circuit, the voltage zero-cross comparator circuit becomes it into voltage pulse signal, voltage pulse signal inputs to Single Chip Microcomputer (SCM) system and detects, phase shift is provided with one road current square-wave signal of required angle to the B phase through the software control pulse signals, pass through phase-shift filtering again, single-chip microcomputer selects enlargement factor to amplify output, current signal phase shift amplifying circuit is except amplifying the B phase current signal, phase shift, outside the filtering, also export other two-phase A through hardware 120 degree phase-shift circuits, C, its phase differential 120 degree, and the negative feedback of process signal guarantees the degree of stability of output signal, three-phase current signal passes through the electric current power amplifier output circuit of same circuits respectively, carry out power amplifier output, three-phase current signal output is the current protecting circuit through being made of No. three comparator circuits also, export to Single Chip Microcomputer (SCM) system and monitor differentiation, the single-chip microcomputer output abnormality, overload, over-current signal is implemented to report to the police through alarm unit; This load source is exported the balanced balanced current load of three tunnel phase places, adjustable amplitude value.
The present invention is under the unsuitable at the scene calibration situation, remove the current return that calibrated meter is connected with former CT, voltage circuit remains unchanged, make power supply by exchanging 220 couchers, a Fictitious load source for in-situ checking electric energy meter is provided artificially, its phase place triggers the AC signal setting by single-chip microcomputer, send into standard scale and calibrated meter simultaneously, read the gauging error of calibrated meter from standard scale, phase place and current capacity size by the keyboard setting device, thereby reach the field-checking electric energy meter, grasp the purpose of electric energy meter operation conditions comprehensively.
Device is made up of three parts such as power supply and single-chip microcomputer, signal Processing, power amplifiers; and have simultaneously that current phase, selection and adjustment, electric current are reported to the police, functions such as current amplitude selection and adjustment, overcurrent protection, power amplification, degree height reasonable in design, multiple functional, intelligent, function admirable.The simulation load source and the application system thereof of the development of this project of utilization, can the composition error test that electric energy meter carries out different load, different power rates be installed to the scene, no matter and whether it is in the little or uncharge situation of load, this device also can be used as the testing power supply that the electric meter field adjustable is used in transformer station or the power plant, double calibrating three-phase current source of doing indoor general usefulness.
The basic mechanical design feature index of device is as follows:
● output maximum current 3 * 6A/ phase (can expand)
● degree of distortion<2%; Power stability<0.1%
● peak power output: 20VA/ phase
● symmetry:<1 °
● but output current open circuit, unusual auto stop are reported to the police
● microcomputerized control, all electronic structure is operated program control fully
● various types of current output signals (different load, different power rate) can be provided
● weight, the general three phase sources of volume want light more than 1/2
More than comprehensive, the present invention is the innovative technology that solves knotty problem in the power production process, contrasts general supply unit, has following advantage and good effect:.
A. simple in structure, easy to carry.Its volume weight price all only has about 1/2 of general power supply, is not only applicable to on-the-spot electrical energy meter calibration, but also can be used as the check of other instrument and meters and indoor calibrating power supply.Device belongs to domestic initiation.
B. adopt micro-processor controlled Design of digital, modular design, simple for structure, function is strong.
C. unusual automatic protection such as output current open circuit, and can the automatic monitoring and protecting indication of power amplification fault.The security of system protective capability is strong.
D. creatively propose to utilize scm software control, trigger the working volts alternating current input signal and carry out the phase place setting, power rate adjustment and setting during dexterously to the little or zero load situation verification electric energy meter of scene load, thereby the his-and-hers watches meter carries out the test under different load, the different power rate, synthetically understand the operation conditions of electric energy meter comprehensively, guarantee the normal reliable ground long-time running of showing to count.
Description of drawings
Fig. 1 is a structural principle block diagram of the present invention
Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6 specifically implement circuit diagram for the present invention.Wherein Fig. 2 comprises power unit, Single Chip Microcomputer (SCM) system, voltage zero-cross comparator circuit, alarm unit circuit; Fig. 3 comprises current signal phase shift amplifying circuit, current protecting circuit; Fig. 4, Fig. 5, Fig. 6 are respectively A phase, B phase, C phase current power amplifier output circuit, and three circuit structures are identical.
Embodiment
Referring to Fig. 1, Fictitious load source for in-situ checking electric energy meter device of the present invention, its purport is to solve the on-the-spot electric energy meter field error check problem that not have to load or move when little current capacity and low power factor.Device mainly is made up of several sections such as voltage zero-cross comparison, alarm unit, power unit, Single Chip Microcomputer (SCM) system, the output of electric current power amplifier, current signal phase shift amplification, current protections.Device is provided by external working power 220V, through power unit convert to direct current ± 5V and ± 30V provides the working power of Single Chip Microcomputer (SCM) system, each electronic circuit and electric current output power amplifier; In addition electric energy metrical screen terminal box A, any phase voltage of B, C (size for 57.7V/100V/220V from the output of electric energy meter table meter voltage end also can) input to the voltage zero-cross comparing unit and become voltage pulse signal, input to Single Chip Microcomputer (SCM) system and detect, phase shift is provided with one road current square-wave signal of required angle to the B phase through the software control pulse signals; Pass through phase-shift filtering again, single-chip microcomputer selects enlargement factor to amplify output.Export other two-phase A, C through hardware 120 degree phase-shift circuits simultaneously, its phase differential 120 degree.Three-phase current signal guarantees the degree of stability of output signal respectively by identical amplifying circuit output through the two paths of signals negative feedback.Three-phase current output is exported to Single Chip Microcomputer (SCM) system through No. three comparator circuits and is differentiated the enforcement overcurrent protection.To prevent unusual output of current device or current return open circuit.Package unit is exported three tunnel phase places, the load of adjustable amplitude value balanced balanced current.Its degree of stability 0.1%, degree of distortion 2.0% satisfies the technical requirement of on-the-spot test electric energy meter and relevant verification rules.
Referring to Fig. 2 is circuit theory diagrams: (power unit and Single Chip Microcomputer (SCM) system, voltage zero-cross comparator circuit, alarm unit) by transformer T1, rectifier bridge B1, capacitor C 1, C2, C3, C4, C5, C6, C7, C8 resistance R 1, R2, R3, light emitting diode L1,, three terminal regulator V1, V2, V3, V4 and fan are formed working power circuit; Form the voltage signal zero cross detection circuit by resistance R 4, R5, R6, diode D1 and operational amplifier U2A; The core control section of single-chip microcomputer U1, row's resistance R 10, crystal oscillator X1, capacitor C 10, C11 and ten button mutual group apparatus for converting is a Single Chip Microcomputer (SCM) system; Handle button (0 °, 30 °, 60 °, 300 °, 330 °) on the one hand and carry out corresponding power rate adjustment electric current output phase angle, export A, B, C three road signals to adjust current amplification factor according to button (0.1Ib, 0.2Ib, 0.5Ib, 1.0Ib) simultaneously; In case monitor current feedback signal on the other hand is abnormal alarm reset inhibit output simultaneously.The core devices of system is U1 single chip computer AT 89C2051,2,3,6 pin are the output of I/O mouth, connect A, B, C three road signals selection enlargement factor, 12,13,14,15,16,17,18,9 pin are the input of I/O mouth, the reception keyboard data inputs to the single-chip microcomputer CPU (central processing unit) and discerns aftertreatment, 7 pin then detect voltage zero-crossing signal, make the phase shift reference signal, the pulse signal Uin after handling through the single-chip microcomputer phase shift by 11 pin I/O output; 8 pin start buzzer warning for the output of I/O mouth; 19 pin I/O mouths inputs Ip detects whether three road current signals are unusual, fault such as overload.Whole Single Chip Microcomputer (SCM) system is transferred to collection, computing, processing and the output that single-chip microcomputer U1 carries out data.
Referring to Fig. 3 circuit theory diagrams (signal processing: current signal phase shift amplifying circuit, current protecting circuit)
Fixed resistance R11, R13, adjustable resistance R12 and amplifier U3A form signal sampling and follow the unit, and R12 is the amplitude semifixed resistor; Form signal amplification unit by resistance R 14, R15, R16 and amplifier U3B; Form the second-order filter unit by R17, R18, C12, C13, U3C; Form phase-shifting unit by R19, R20, R21, R22, R23, C14, U3D, R22 is the phase place semifixed resistor; Form current amplification factor by R25, R26, R27, R28, R29, U4, U5A the unit is set; Form the second-order filter unit by R30, R31, R32, C15, C16, U5B; Form follow circuit by R33, U5C; Form the B phase current by electrochemical capacitor C201, C202, resistance R 203, R205, R206, R207, R208 and capacitor C 203, C204, C205, U6C and amplify and the negative feedback unit, Ub is a B phase voltage feedback signal, and Ib partly amplifies output for power amplifier; R209, R210, R211, C207, C206, diode D201, D202 and U6D form B phase current signal square wave comparing unit, as the overcurrent protection of B phase; The counterclockwise phase shift 120 degree element circuits of U5D14 pin current output signal through forming by R100, R101, R102, C100 and U6A, the same amplification through the electric current as the B phase exported negative feedback unit and current signal square wave comparing unit, Ua is an A phase voltage feedback signal, and Ia partly amplifies output for power amplifier; The output of C phase current then is to spend element circuits through the counterclockwise phase shift of being made up of R300, R301, R302, C300 and U6B 120 again on A phase amplifier U6A1 pin basis, the same amplification through the electric current as the A phase exported negative feedback unit and current signal square wave comparing unit, Uc is a C phase voltage feedback signal, and Ic partly amplifies output for power amplifier.Signal Ip is faults such as whether three road current signals are unusual, overload for detecting, and input to Single Chip Microcomputer (SCM) system and monitor.
Referring to Fig. 4,5,6 is three-phase power amplifier output circuit schematic diagram (power amplifier part)
Ia signal process, the typical differential mode input amplifying circuit that triode Q101, Q102, Q103, Q104, Q105, Q106, Q107, resistance R 112, R113, R114, R115, R116, R117, R118, R119, R120, R121, R122, capacitor C 108, C109, C110, diode D103, D104, D106, D108,10V, stabilivolt D107, D109, light emitting diode D105 form; Form push-pull output circuit through field effect transistor Q108, Q109, diode D110, D111 again; Sampling is carried out voltage signal and is fed back to Ua through R126, C111 again; The R127 sampling is carried out current signal and is fed back to ia; At last through output transformer Ta output 5A, 1A, 0A third gear electric current.B phase, C phase current power amplification all similar (seeing 5,6 pages in accompanying drawing) with A, input is respectively Ib, Ic, electric current and Voltage Feedback then are respectively Ub, Uc, ib, ic, these signals link to each other with the corresponding label of accompanying drawing the 3rd page signal handling principle figure respectively, the first figure place word bit of each device label changes 2 (B phases), 3 (C phases) into by 1 respectively in B phase, the C phase current power amplification circuit simultaneously, to show difference, all the other zone bits are then constant.
Integrated circuit and relevant elements model are as follows:
U1 (single chip computer AT 89C2051) U2 (four high guaily unit MAX479EPD)
Q1 (triode 8050) X1 (crystal oscillator 11.0592MHz)
F1 (protective tube 1A) S1 (single-pole double-throw switch (SPDT))
V1 (three terminal regulator 7815) V2 (three terminal regulator 7805)
V3 (three terminal regulator 7915) V4 (three terminal regulator 7905)
B1 (rectifier bridge) T1 (transformer 220V:30V)
U3 (four high guaily unit MAX479EPD) U4 (analog switch CD4051)
U5 (four high guaily unit MAX479EPD) U6 (four high guaily unit MAX479EPD)
U7 (four high guaily unit MAX479EPD) Ta, Tb, Tc (output current transformer
1A:5A/1A/0A)
Dxx (diode) Rxx (resistance)
Cxx (electric capacity)

Claims (1)

1, a kind of Fictitious load source for in-situ checking electric energy meter, it is characterized in that this load source is by the voltage zero-cross comparator circuit, alarm unit, power unit, Single Chip Microcomputer (SCM) system, current signal phase shift amplifying circuit, electric current power amplifier output circuit, current protecting circuit is formed, the external 220V working power of this load source, through power unit convert to direct current ± 5V and ± 30V offers monolithic system, the working power of each electronic circuit and electric current power amplifier output circuit, electric energy metrical screen end case A phase voltage, the B phase voltage, any phase voltage or electric energy meter table meter voltage end voltage in the C phase voltage, input to the voltage zero-cross comparator circuit, the voltage zero-cross comparator circuit becomes it into voltage pulse signal, voltage pulse signal inputs to Single Chip Microcomputer (SCM) system and detects, phase shift is provided with one road current square-wave signal of required angle to the B phase through the software control pulse signals, pass through phase-shift filtering again, single-chip microcomputer selects enlargement factor to amplify output, current signal phase shift amplifying circuit is except amplifying the B phase current signal, phase shift, outside the filtering, also export other two-phase A through the counterclockwise phase-shift circuit of hardware 120 degree, C, its phase differential 120 degree, and the negative feedback of process signal guarantees the degree of stability of output signal, three-phase current signal passes through the electric current power amplifier output circuit of same circuits respectively, carry out power amplifier output, three-phase current signal output is the current protecting circuit through being made of No. three comparator circuits also, export to Single Chip Microcomputer (SCM) system and monitor differentiation, the single-chip microcomputer output abnormality, overload, over-current signal is implemented to report to the police through alarm unit; This load source is exported the balanced balanced current load of three tunnel phase places, adjustable amplitude value.
CN 02113948 2002-01-30 2002-01-30 Fictitious load source for in-situ checking electric energy meter CN1270188C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 02113948 CN1270188C (en) 2002-01-30 2002-01-30 Fictitious load source for in-situ checking electric energy meter

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Application Number Priority Date Filing Date Title
CN 02113948 CN1270188C (en) 2002-01-30 2002-01-30 Fictitious load source for in-situ checking electric energy meter

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CN1435697A CN1435697A (en) 2003-08-13
CN1270188C true CN1270188C (en) 2006-08-16

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* Cited by examiner, † Cited by third party
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CN101231333B (en) * 2008-01-11 2012-01-18 莱芜供电公司 Portable metrology charge instrument
CN101493479B (en) * 2009-02-18 2012-12-12 珠海市科荟电器有限公司 Electric current generating circuit, method and electric energy meter check meter
CN102944865A (en) * 2012-11-23 2013-02-27 深圳市航天泰瑞捷电子有限公司 Method and system for automatic calibration of single-phase meter
CN104635195B (en) * 2013-11-13 2017-09-08 中国石油化工股份有限公司 Beam pumping unit applied load electric energy meter error on-spot tester
CN103592507B (en) * 2013-11-29 2017-08-08 国网安徽省电力公司淮南供电公司 Transformer station's metering device voltage circuit alarm
CN103983942B (en) * 2014-05-26 2016-01-20 国家电网公司 A kind of switchable Intelligent energy meter verifying device of actual situation load and method thereof
CN104502883B (en) * 2014-12-30 2017-07-07 宁波三星医疗电气股份有限公司 The abnormality detection and solution of computation chip
CN105652077A (en) * 2015-12-30 2016-06-08 天津诚电科技有限公司 Current testing instrument
CN108492658B (en) * 2018-03-30 2019-09-17 国网四川省电力公司德阳供电公司 Portable electric meter wiring emulating instrument

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