CN105093162A - Method and device for calibrating measurement error of electric energy meter under pulse train interference condition - Google Patents
Method and device for calibrating measurement error of electric energy meter under pulse train interference condition Download PDFInfo
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- CN105093162A CN105093162A CN201510484645.1A CN201510484645A CN105093162A CN 105093162 A CN105093162 A CN 105093162A CN 201510484645 A CN201510484645 A CN 201510484645A CN 105093162 A CN105093162 A CN 105093162A
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Abstract
The invention relates to a method and a device for calibrating a measurement error of an electric energy meter under a pulse train interference condition. The calibration device comprises a high-precision power supply, a filter, a pulse train generator, a load device and a pulse counting error display controller, and is characterized in that a pulse counting terminal is connected to the pulse counting error display controller, the pulse counting error display controller comprises a pulse acquisition unit, a main control unit and a display unit; the pulse acquisition unit is used for acquiring pulses of an electric energy meter to be tested; the main control unit is used for pulse time interval calculation and measurement error calculation; and the display unit is used for displaying an error test result. According to the invention, pulse interval calculation is adopted, and the calculation efficiency and the calculation speed are high.
Description
Technical field
The present invention relates to electric energy meter error in dipping calibration method and device under a kind of pulse train disturbed condition.
Background technology
Normal voltage adopts electronic regulation, voltage regulating mode, normalized current adopts electronic constant current source side formula to produce, but due to standard source employing electron device generation normal voltage and electric current, when pulse train disturbs, there is the phenomenon such as Voltage Drop, electric current misalignment in standard source, gauging error consistance is poor.In test process, tester observes instrument and stares at and looks, and has (voltage, electric current fall) without exception test case according to standard source, and analyze the accuracy of judged result, error determine result has human factor.
Summary of the invention
The object of this invention is to provide electric energy meter error in dipping calibration method and device under a kind of pulse train disturbed condition, in order to solve the problem of prior art manual testing poor accuracy.
For achieving the above object, the solution of the present invention comprises:
Electric energy meter error in dipping calibration method under pulse train disturbed condition, step is as follows: (1) is to electric energy meter to be tested, the pulse interval of detection record under no pulse group disturbed condition in the unit interval, compare with given pulse interval under no pulse group disturbed condition, do not applied the measuring error Er1 under pulse train disturbed condition; Its pulse interval under the pulse train disturbed condition of setting power in the unit interval of detection record, with have pulse train disturbed condition under given pulse interval compare, obtain applying the measuring error Er2 under pulse train disturbed condition; (2) judge the variable Δ Er of Er1 and Er2, compare with given threshold value, if be less than given threshold value, meet the requirements, if be greater than threshold value, undesirable.
Further,
The present invention also provides a kind of calibrating installation, comprise high-precision power, wave filter, group pulse generator, load device, step-by-step counting error display controller and for install electric energy meter to be tested input calibrating terminal, for connect electric energy meter to be tested export lead-out terminal and for be connected electric energy meter pulse to be tested export step-by-step counting terminal; Described high-precision power connects described calibrating terminal by described wave filter; Group pulse generator connects described calibrating terminal by capacitance coupling circuit; Described load device connects described lead-out terminal; Described step-by-step counting terminal connects step-by-step counting error display controller, and step-by-step counting error display controller comprises pulse collection unit, main control unit and display unit; Pulse collection unit is for gathering electric energy meter pulse to be measured; Main control unit is used for pulse interval and calculates and measuring error calculating; Display unit is used for display error test result.
Further, described high-precision power is three-phase high-precision power, and described wave filter is Three-phase electric-wave filter; Described three-phase high-precision power comprises the three-phase high-precision voltage stabilizing device, first order three-phase decoupling network, three-phase isolation transformer and the second level three-phase decoupling network that connect successively.
Further, described wave filter is π type LC filter network, and filter inductance two ends are respectively equipped with high-frequency filter capacitor and the low frequency filtering electric capacity of ground connection.
Further, described load device comprises three groups of resistance circuits of corresponding three-phase respectively, often organizes resistance circuit and is made up of some branch roads, and the resistant series that every bar props up routing relay and setting size forms.
First, by being recorded in the pulse interval in the no pulse group disturbed condition lower unit interval, and there being the pulse interval under pulse train disturbed condition in the unit interval, record is completed by corresponding equipment, due under the certain power condition of input, electric energy meter can export the pulse of corresponding frequencies, and the umber of pulse in certain hour is corresponding with power.Just can counter circuit power by test pulse number, in the effective unit time, pulse number compares with the pulse number in the corresponding time under given power, can calculate electric energy metering error.The present invention utilizes equivalence principle, recurrent interval umber of pulse being converted into certain pulses width calculates, and judge whether electric energy meter meets the requirements by comparing with given standard error (threshold value), not only calculate the impact accurately avoiding human factor, and adopting the recurrent interval to calculate, counting yield is high, speed is fast.
Device of the present invention, stores standard error etc. in the controller, conveniently compares judgement.And structure is simple, cost is lower.
Accompanying drawing explanation
Fig. 1 is calibrating installation schematic diagram of the present invention;
Fig. 2 is calibration method schematic diagram;
Fig. 3 is three-phase high-precision power schematic diagram;
Fig. 4 is Three-phase electric-wave filter circuit theory diagrams;
Fig. 5 is load device circuit theory diagrams.
Embodiment
This device realizes principle and utilizes electric energy power measurement and electric energy measurement principle and design.Under the certain power condition of input, electric energy meter can export the pulse of corresponding frequencies, and the umber of pulse in certain hour is corresponding with power.Just can counter circuit power by test pulse number, in the effective unit time, pulse number compares with the pulse number in the corresponding time under given power, can calculate electric energy metering error, and computing formula is:
Er: electric energy metering error.
M0: actual pulse number.
M: given full sized pules number.
Utilize equivalence principle, then umber of pulse be converted into the recurrent interval of certain pulses width, above-mentioned error calculation formula is converted into:
T0: the actual pulse time interval.
T: given pulse interval.
Test applies the error under pulse train disturbed condition and does not apply the error of disturbed condition respectively, then will the two application condition, and can obtain under pulse train disturbs and change the impact of electric energy meter error in dipping, error change amount computing formula is:
Δ Er: electric energy metering error variable quantity;
Er1: do not apply the measuring error under pulse train disturbed condition;
Er2: apply the measuring error under pulse train disturbed condition.
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Electric energy meter error in dipping calibration method embodiment under pulse train disturbed condition
Electric energy meter error in dipping calibration method under pulse train disturbed condition, as shown in Figure 1, to electric energy meter to be tested, the pulse interval of detection record under no pulse group disturbed condition in the unit interval, compare with given pulse interval under no pulse group disturbed condition, do not applied the measuring error Er1 under pulse train disturbed condition; Its pulse interval under the pulse train disturbed condition of setting power in the unit interval of detection record, with have pulse train disturbed condition under given pulse interval compare, obtain applying the measuring error Er2 under pulse train disturbed condition; Judge the variable Δ Er of Er1 and Er2, compare with given threshold value, if be less than given threshold value, meet the requirements, if be greater than threshold value, undesirable.
Concrete, the algorithm of Δ Er can adopt:
certainly, also additive method can be adopted.Above-mentioned given pulse interval knows in advance and stores in the controller, is specifically described below to the calibrating installation related to.
Electric energy meter error in dipping calibrating installation embodiment under pulse train disturbed condition
This contrive equipment composition is made up of five major parts, and comprise three-phase high-precision power, Three-phase electric-wave filter, load device, group pulse generator, step-by-step counting error display controller, device composition frame chart is shown in Fig. 2.Lower mask body is described.
Step-by-step counting error display controller, is the core of whole proving installation, is made up of pulse collection unit, main control unit, display unit.Pulse collection unit is mainly used to gather electric energy meter pulse, provides hardware supported loop, for ensureing the reliable accurate acquisition of pulse, adopts Shielded Twisted Pair and the earthing of casing; Main control unit completes the functions such as pulse interval, error calculation (the main computing function namely in said method embodiment) and statistical conversion; Display unit is alternating interface between man and computer, is used for display error test result.
Controller adopts the intelligent chips such as microprocessor.
In the present embodiment, three-phase high-precision power provides general supply for whole device, more than 4 times of this power requirement load-bearing capacity at least test loop peak power, with the impact of proof load on power supply voltage; This power acquisition precision three-phase voltage-stabilizing power supply within 0.2%, ensures that output voltage meets measuring accuracy requirement simultaneously, and voltage regulating mode adopts automatic voltage regulation mode.In addition, for harmonic carcellation, clutter are on the impact of general supply, increase the isolating transformer that triangle/star connects, realize isolated from power again simultaneously.
As Fig. 3, civil power three-phase four-wire power directly accesses the input end of three-phase high-precision voltage stabilizing device, the output of adjustment voltage stabilizer is required according to testing power supply, then through first order three-phase decoupling network, realize the one-level filtering of impulse disturbances, then will export the triangle link being linked into three-phase isolation transformer again, star terminals access on the three-phase decoupling network of the second level again, and the turn ratio of the former secondary of transformer is 1:1; Through two-stage three-phase decoupling network and isolated from power, the interference that pulse train produces is almost very little on high-precision power impact.
Three-phase electric-wave filter, in whole device, design parameter ensures the pulse train of group pulse generator generation on power supply almost without impact, for reaching this object, the measure of employing two stage filter.Circuit theory is as Fig. 4, and be π type LC filter network, filter inductance two ends are respectively equipped with high-frequency filter capacitor and the low frequency filtering electric capacity of ground connection.L1-L5 is filter inductance, and C1-C4 is high-frequency filter capacitor, and C5-C8 is low frequency filtering electric capacity; For the impact of effective filtering pulse train interference on power supply, in corresponding phase line, the neutral line, PE line loop, increase ferrite device.Above-mentioned first, second grade of three-phase decoupling network also can adopt above-mentioned filter form.
As Fig. 4, in three-phase decoupling network, for ensureing decoupling effect, C1-C4 adopts the decoupling capacitor of 33nf, inductance L 1-L5 adopts the inductance of 1000uH, and C5-C8 adopts the decoupling capacitor of 10uF, and ferrite is selected according to source impedance, loaded impedance and actual filter effect, ferrite impedance is made up of two parts, induction reactance Xls, equivalent resistance Rs, both are all relevant with frequency, in conjunction with actual loop, suitably adjust parameter, the impedance computation under high frequency is as follows: Z=(Xls
2+ Rs
2) 1/2; Z: ferrite impedance; Xls: ferrite induction reactance; Rs: ferrite equivalent resistance.
Group pulse generator is pulse train generating means, produces difference and requires burst of pulses, be coupled to not on isopen, the neutral line, PE line, and be applied on meters under test calibrating terminal by capacitance coupling circuit according to test request.
Electric energy meter to be measured, for reality ammeter to be measured, apply different voltage, electric current according to the model of electric energy meter, specification, technical requirement, to its no pulse group, have pulse train disturbed condition under carry out error testing and compare its situation of change, judge whether to meet standard-required.
Load device is used for analog constant load, according to rated voltage, the current parameters situation of electric energy meter, produces satisfactory electric current.Analog constant load is made up of several sections of pull-up resistors, and every section of ohmic load has switch control rule, realizes loop break-make and switches.Resistance adopts the manganese-copper filament that warm driftization is less, and porcelain insulating post that is heat-resisting, that insulate forms around finger.For reducing the change of heating to pull-up resistor, increase by two groups of radiator fans respectively in the upper and lower part of pull-up resistor, to strengthen radiating effect.
As Fig. 5, for satisfied difference test phenotype (single-phase meter, three-phase meter) requirement, load is divided into three-phase, every phase load loop is all made up of different loads resistance, every section of pull-up resistor resistance is different, to produce different loop currents, then switched by the circuit of every section of pull-up resistor, combined the fundamental current requirement meeting all size table.Such as, loop voltage is AC220V, and when k1, k5, k9 close, loop produces the electric current of 5A; When k2, k6, k10 close, loop produces the electric current of 10A; When k3, k7, k11 close, loop produces the electric current of 20A; When k4, k8, k12 close, loop produces the electric current of 50A; But when by switch combination, as closed in k1, k5, k9 and k2, k6, k10 also close, and loop produces the electric current of 15A; As k1, k5, k9 close and k3, k7, k11 also produce the electric current of 25A in closed-loop path, by that analogy, maximum generation current is 85A in other combinations.The fundamental current of current electric energy meter is 20A to the maximum, meets current specification test request.
Be presented above concrete embodiment of the present invention, but the present invention is not limited to described embodiment.Under the thinking that the present invention provides; the mode easily expected to those skilled in the art is adopted to convert the technological means in above-described embodiment, replace, revise; and the effect played goal of the invention that is substantially identical with the relevant art means in the present invention, that realize is also substantially identical; the technical scheme of such formation is carried out fine setting to above-described embodiment and is formed, and this technical scheme still falls within the scope of protection of the present invention.
Claims (6)
1. electric energy meter error in dipping calibration method under pulse train disturbed condition, it is characterized in that, step is as follows:
1) to electric energy meter to be tested, the pulse interval of detection record under no pulse group disturbed condition in the unit interval, compares with given pulse interval under no pulse group disturbed condition, is not applied the measuring error Er1 under pulse train disturbed condition; Its pulse interval under the pulse train disturbed condition of setting power in the unit interval of detection record, with have pulse train disturbed condition under given pulse interval compare, obtain applying the measuring error Er2 under pulse train disturbed condition;
2) judge the variable Δ Er of Er1 and Er2, compare with given threshold value, if be less than given threshold value, meet the requirements, if be greater than threshold value, undesirable.
2. electric energy meter error in dipping calibration method under pulse train disturbed condition according to claim 1, is characterized in that,
3. utilize the calibrating installation of calibration method described in claim 1, it is characterized in that, comprise high-precision power, wave filter, group pulse generator, load device, step-by-step counting error display controller and for install electric energy meter to be tested input calibrating terminal, for connect electric energy meter to be tested export lead-out terminal and for be connected electric energy meter pulse to be tested export step-by-step counting terminal; Described high-precision power connects described calibrating terminal by described wave filter; Group pulse generator connects described calibrating terminal by capacitance coupling circuit; Described load device connects described lead-out terminal; Described step-by-step counting terminal connects step-by-step counting error display controller, and step-by-step counting error display controller comprises pulse collection unit, main control unit and display unit; Pulse collection unit is for gathering electric energy meter pulse to be measured; Main control unit is used for pulse interval and calculates and measuring error calculating; Display unit is used for display error test result.
4. calibrating installation fixed according to claim 3, is characterized in that, described high-precision power is three-phase high-precision power, and described wave filter is Three-phase electric-wave filter; Described three-phase high-precision power comprises the three-phase high-precision voltage stabilizing device, first order three-phase decoupling network, three-phase isolation transformer and the second level three-phase decoupling network that connect successively.
5. calibrating installation according to claim 4, is characterized in that, described wave filter is π type LC filter network, and filter inductance two ends are respectively equipped with high-frequency filter capacitor and the low frequency filtering electric capacity of ground connection.
6. calibrating installation according to claim 4, is characterized in that, described load device comprises three groups of resistance circuits of corresponding three-phase respectively, often organizes resistance circuit and is made up of some branch roads, and the resistant series that every bar props up routing relay and setting size forms.
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| CN106443554A (en) * | 2016-08-30 | 2017-02-22 | 山东省计量科学研究院 | Auxiliary integrated decoupling network system for electric energy meter EMS online test system |
| CN110609252A (en) * | 2019-09-30 | 2019-12-24 | 国网山东省电力公司电力科学研究院 | Anti-interference circuit for restraining direct current electric energy meter in-situ quick pulse group error detection |
| CN111175686A (en) * | 2020-01-12 | 2020-05-19 | 深圳市江机实业有限公司 | Method for judging stability of metering error of single-phase intelligent electric energy meter in installation site |
| CN113253187A (en) * | 2020-12-24 | 2021-08-13 | 上海贝岭股份有限公司 | Electrical fast transient burst test system |
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