CN202794496U - Real-time online monitoring instrument for power metering device - Google Patents

Abstract

The utility model discloses a real-time online monitoring instrument for a power metering device, belonging to the technical field of power metering. The monitoring instrument comprises an instrument housing and a real-time power metering structure, wherein the real-time power metering structure comprises a real-time online detection mechanism for detecting the voltage, the current, the current amplitude, the phase value, secondary loop voltage drop information, even power metering information of a power meter and error information of the above, and is composed of a microcomputer/microprocessor and different software managing electronic circuits thereof for real-time and online monitoring, metering, comparing, recording and displaying different parameters of power metering and errors thereof. The instrument has the advantages that a voltage transformer, a current transformer and the microprocessor are integrated to carry out both power metering and power metering error monitoring; real-time online secondary-side detection is employed; a combined error of the power metering device can be accurately metered via precise calculation of the microcomputer; the instrument is characterized by precision, automation and modernization; and the instrument processes advanced designing idea, simple structure, reliable, economic and practical performance, and good market prospects.

Description

Electric power meter real time on-line monitoring instrument

One. technical field

The disclosed electric power meter real time on-line monitoring of the utility model instrument belongs to the Electric Energy Metering Technology field, and what be specifically related to is a kind of instrument that electric power meter is carried out real time on-line monitoring.

Two. background technology

Electric power meter comprises all kinds electric energy meter, metering voltage, current transformer and secondary circuit, electric energy metering cabinet (case) etc.Send out in electric system, supply, in the links of electricity consumption, installed a large amount of electric power meters, be used for measuring generated energy, power consumption, delivery, electricity sales amount etc.For formulating the production schedule, account cost, collecting electric weight foundation is provided.The production of electric power and the production of other products are different, be characterized in sending out, be linked to be a system for, electricity consumption three parts, that can not be interrupted links together, and be closely connected mutually indispensable, they are electricity volume sold how mutually, how to calculate, just need a measurement instrument to carry out the quantity that meter is calculated electric energy at three party, this device is exactly electric power meter, without it, send out, for just can't selling aspect three of, the electricity consumptions, buy and sell electric weight, so electric power meter send out, confession, electricity consumption three parts's status is very important.Electric power meter real time on-line monitoring instrument of the present utility model is just in order to guarantee that the electric power meter accuracy of measuring develops.This instrument collecting voltage mutual inductor (PT), current transformer (CT) and micro computer or microprocessor are that the main electric energy metrical that consists of and error monitoring thereof are in one, adopt the real-time online secondary side to detect, by micro computer or the accurate calculating of microprocessor, with metering each parameter of electric energy and error thereof, this each parameter of instrument metering electric energy has the characteristics such as precise treatment, robotization, modernization, this instrument is reliable, practical, can measure exactly the electric power meter composition error, have undoubtedly market outlook.

Three. summary of the invention

Goal of the invention of the present utility model is: provide this electric power meter real time on-line monitoring instrument to society, it has the characteristics such as simple in structure, practical reliable, that metering is accurate, is worth adopting and promoting.

Technical scheme of the present invention is such: this electric power meter real time on-line monitoring instrument, comprise Instrument shell and real-time online electric energy metrical structure thereof, technical characterstic is: described real-time online electric energy metrical structure includes: metering or detection voltage and current information, current amplitude and phase value information, secondary circuit voltage drop information, even the metering of the real-time online of the control information of the electric energy metrical information of electric energy meter and above-mentioned each information or testing agency.Described electric power meter is comprised of voltage transformer (VT) (PT), current transformer (CT) and electric energy meter usually.Correspondingly, the error that caused by PT error, CT error, PT secondary voltage drop of the composition error of electric power meter and several parts such as error of electric energy meter form.Electric power meter real time on-line monitoring instrument of the present utility model adopts the detection of real-time online secondary side, by micro computer or microprocessor and the accurate calculating of software thereof, with metering each parameter of electric energy and error thereof, can measure exactly the electric power meter composition error, guarantee the accuracy of electric power meter electric energy metrical.

According to above-described electric power meter real time on-line monitoring instrument, technical characterstic also has: described real-time online electric energy metrical structure is provided with the micro computer of real time on-line monitoring, metering, comparison, record, each parameter of demonstration electric energy metrical and error thereof or each electronic circuit of microprocessor and software administration control thereof.Described micro computer or microprocessor can be selected various public micro computers or microprocessor.

According to above-described electric power meter real time on-line monitoring instrument, technical characterstic also has: described each electronic circuit of a. includes: the voltage transformer (VT) of real time on-line monitoring, current transformer and sampling thereof or sample circuit, mould/number conversion circuit, metering circuit, comparator circuit, writing circuit, display circuit, interface circuit.Described above-mentioned these circuit all can adopt public circuit engineering content to go to realize or make.B. described metering circuit, comparator circuit, writing circuit all are ingredients of micro computer or microprocessor.Its software program of the metering circuit of described micro computer or microprocessor comprises having; The voltage transformer (VT) error in dipping value of real time on-line monitoring is calculated and drawn to sampling or the voltage and current information that detects by mathematical formulae, and described mathematical formulae is:

This is public formula, and each parameter describes in detail in an embodiment in the formula.Also each error of handlebar sampling or detection calculates and draws the composition error value of electric power meter in real time by mathematical formulae.For three-phase three wire system, described mathematical formulae is:

$\mathrm{\&epsiv;}=\frac{1}{{P\&prime;}_1+{P\&prime;}_3}\&times;\{{P\&prime;}_1({\mathrm{\&epsiv;}}_{\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="HSA00000722093300011.png"\; state="\{\{state\}\}">W</figure-callout>}1}+f_{\mathrm{Uab}}+f_{\mathrm{ab}}+f_{\mathrm{Ia}})+{P\&prime;}_3({\mathrm{\&epsiv;}}_{W3}+f_{\mathrm{Ucb}}+f_{\mathrm{cb}}+f_{\mathrm{Ic}})$

This also is public formula, and each parameter describes in detail in an embodiment in the formula.For three-phase four wire system, described mathematical formulae is:

$\mathrm{\&epsiv;}=\frac{1}{{P\&prime;}_1+{P\&prime;}_2+{P\&prime;}_3}\&times;\{{P\&prime;}_1\&times;({\mathrm{\&epsiv;}}_{\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="HSA00000722093300011.png"\; state="\{\{state\}\}">W</figure-callout>}1}+f_{\mathrm{Ua}0}+f_{a0}+f_{\mathrm{Ia}})+{P\&prime;}_2\&times;({\mathrm{\&epsiv;}}_{\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="HSA00000722093300012.png"\; state="\{\{state\}\}">W</figure-callout>}2}+f_{\mathrm{Ub}0}+f_{b0}+f_{\mathrm{Ib}})$

This or public formula, each parameter describes in detail in an embodiment in the formula.Described comparator circuit is that each parameter of electric energy and the composition error thereof of electric power meter compares with each parameter of standard electric energy to metering circuit result of calculation.Described writing circuit namely is the micro computer of this instrument or storage unit or the storer of microprocessor.C. described display circuit comprises display screen, and display screen is arranged on the panel of electric power meter real time on-line monitoring Instrument shell.The display screen of described display circuit can show numerical value, polar plot, curve of each parameter of electric energy metrical and composition error thereof etc.

According to above-described electric power meter real time on-line monitoring instrument, technical characterstic also has: described this electric power meter real time on-line monitoring instrument connects by interface circuit and uploads each parameter of electric energy of real time on-line monitoring, metering and error thereof to host computer.Described host computer can be the computing machine of various administrative authoritys.Described uploading can adopt wired or wireless public network to carry out.

Electric power meter real time on-line monitoring instrument advantage of the present utility model has: 1. this instrument collecting voltage mutual inductor (PT), current transformer (CT) and micro computer or microprocessor are that the main electric energy metrical that consists of and error monitoring thereof are in one, have the characteristics such as precise treatment, robotization, modernization, design concept is more advanced.2. this instrument metering each parameter of electric energy and error thereof adopt the real-time online secondary side to detect, by micro computer or the accurate calculating of microprocessor, in order to measure each parameter of electric energy and error thereof, can measure exactly the electric power meter composition error, simple in structure, dependable performance.3. this instrument is economical and practical, has undoubtedly good market outlook.

Four. description of drawings

Electric power meter real time on-line monitoring instrument Figure of description of the present utility model has 2 width of cloth:

Fig. 1 is electric power meter real time on-line monitoring instrument general structure synoptic diagram;

Fig. 2 is electric power meter real time on-line monitoring instrument particular circuit configurations block scheme.

Adopted unified label in each figure, namely same object is used same label in each figure.In two figure: 1. voltage transformer (VT); 2. current transformer; 3. voltage three-phase secondary line input end; 4. current three-phase secondary line input end; 5. current transformer is monitored part; 6. voltage transformer (VT) is monitored part; 7. three-phase power line; 8. current three-phase secondary cable; 9. current three-phase secondary line user electric energy meter input end sampling end; 10. voltage three-phase secondary cable; 11. voltage three-phase secondary line user electric energy meter input end sampling end; 12. user's electric energy meter; 13. Secondary Circuit of Potential Transformer pressure drop electric energy metering error real time on-line monitoring part; 14. sampling or sample circuit; 15. mould/number conversion circuit; 16. micro computer or microprocessor; 17. display circuit; 18. interface circuit.

Five. embodiment

Electric power meter real time on-line monitoring instrument non-limiting examples of the present utility model is as follows:

Embodiment one. electric power meter real time on-line monitoring instrument

This routine electric power meter real time on-line monitoring instrument concrete structure is united by Fig. 1～Fig. 2 and is illustrated, this electric power meter real time on-line monitoring instrument, comprise Instrument shell and real-time online electric energy metrical structure thereof, Fig. 1 illustrates this routine electric power meter real time on-line monitoring instrument general structure synoptic diagram, this routine real-time online electric energy metrical structure includes: metering or detection voltage and current information, current amplitude and phase value information, secondary circuit voltage drop information, even the metering of the real-time online of the control information of the electric energy metrical information of electric energy meter and above-mentioned each information or testing agency.As shown in Figure 1, common electric power meter is comprised of voltage transformer (VT) 1 (PT), current transformer 2 (CT) and electric energy meter 12 etc.Correspondingly, the error that caused by PT error, CT error, PT secondary voltage drop of the composition error of electric power meter and several parts such as error of electric energy meter form.Electric power meter real time on-line monitoring instrument of the present utility model is made of jointly current transformer monitoring part 5, voltage transformer (VT) monitoring part 6, the Secondary Circuit of Potential Transformer pressure drop electric energy metering error real time on-line monitoring part 13 of Fig. 1.This routine instrument adopts the real-time online secondary side to detect, by micro computer or microprocessor and the accurate calculating of software thereof, in order to measure each parameter of electric energy and error thereof, can measure exactly the electric power meter composition error, guarantee the accuracy of electric power meter electric energy metrical.The real-time online electric energy metrical structure of this example instrument is provided with the micro computer of real time on-line monitoring, metering, comparison, record, each parameter of demonstration electric energy metrical and error thereof or each electronic circuit of microprocessor 16 and software administration control thereof.Each electronic circuit of this example includes: the voltage transformer (VT) 1 of real time on-line monitoring, current transformer 2 and sampling thereof or sample circuit 14, mould/number conversion circuit 15, metering circuit, comparator circuit, writing circuit, display circuit 17, interface circuit 18 etc.Fig. 2 shows this electric power meter real time on-line monitoring instrument particular circuit configurations block scheme, also has among the figure: voltage three-phase secondary line input 3, current three-phase secondary line input 4 etc.The micro computer that this is routine or microprocessor 16 can be selected various public micro computers or microprocessor, such as various industrial micro computers or microprocessor.Described above-mentioned these circuit all can adopt public circuit engineering content to go to realize or make.Above-mentioned metering circuit, comparator circuit, writing circuit all are ingredients of micro computer or microprocessor 16.Its software program of the metering circuit of the micro computer that this is routine or microprocessor 16 comprises having: the voltage transformer (VT) error in dipping value of real time on-line monitoring is calculated and drawn to sampling or the voltage and current information that detects by mathematical formulae, and its mathematical formulae is:

In the formula: f _U, δ _URatio and the angular difference of-tested voltage transformer (VT) under the actual motion load;

f ₀, δ ₀-unloaded ratio and the unloaded angular difference measured in advance;

f _H, δ _HRatio and angular difference under-the rated load measured in advance;

I _XThe secondary current of the lower voltage transformer (VT) of-actual motion load;

I _HSecondary current under the-rated load measured in advance;

The angle of impedance of-actual motion load, i.e. phase angle between voltage transformer secondary voltage and secondary current;

Angle of impedance under the-rated load measured in advance;

(%)-result of calculation is percentage;

(')-result of calculation unit is for dividing.Also each error of handlebar sampling or detection calculates and draws the composition error value of electric power meter in real time by mathematical formulae.For three-phase three wire system, used mathematical formulae is: $\mathrm{\&epsiv;}=\frac{1}{{P\&prime;}_1+{P\&prime;}_3}\&times;\{{P\&prime;}_1({\mathrm{\&epsiv;}}_{\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="HSA00000722093300011.png"\; state="\{\{state\}\}">W</figure-callout>}1}+f_{\mathrm{Uab}}+f_{\mathrm{ab}}+f_{\mathrm{Ia}})+{P\&prime;}_3({\mathrm{\&epsiv;}}_{W3}+f_{\mathrm{Ucb}}+f_{\mathrm{cb}}+f_{\mathrm{Ic}})$

In the formula: the composition error of ε-electric power meter;

ε _W1, ε _W3The relative error of-first-phase, third phase power ammeter (%);

P ' ₁, P ' ₃AC power (electric energy) value that-first-phase, third phase power ammeter record;

f _Uab, δ _Uab-AB phase voltage mutual inductor (or voltage transformer secondary line voltage ) ratio (%) and angular difference (');

f _Ucb, δ _Ucb-CB phase voltage mutual inductor (or voltage transformer secondary line voltage ) ratio (%) and angular difference (');

f _Ia, δ _IaThe ratio of-A phase current mutual inductor (%) and angular difference (');

f _Ic, δ _IcThe ratio of-C phase current mutual inductor (%) and angular difference (');

f _Ab, δ _AbRatio (%) and the angular difference (') of-AB phase voltage secondary circuit voltage drop;

f _Cb, δ _AbRatio (%) and the angular difference (') of-C B phase voltage secondary circuit voltage drop;

(%)-and ratio: percentage;

(')-angular difference: unit is for dividing;

-be respectively

With

Between,

With

Between phase angle;

The AB of-electric energy meter place phase voltage, the CB of electric energy meter place phase voltage;

-secondary current phasor.For three-phase four wire system, used mathematical formulae is:

$\mathrm{\&epsiv;}=\frac{1}{{P\&prime;}_1+{P\&prime;}_2+{P\&prime;}_3}\&times;\{{P\&prime;}_1\&times;({\mathrm{\&epsiv;}}_{\mathrm{<figure-callout\; id="1"\; label="W"\; filenames="HSA00000722093300011.png"\; state="\{\{state\}\}">W</figure-callout>}1}+f_{\mathrm{Ua}0}+f_{a0}+f_{\mathrm{Ia}})+{P\&prime;}_2\&times;({\mathrm{\&epsiv;}}_{\mathrm{<figure-callout\; id="2"\; label="W"\; filenames="HSA00000722093300012.png"\; state="\{\{state\}\}">W</figure-callout>}2}+f_{\mathrm{Ub}0}+f_{b0}+f_{\mathrm{Ib}})$

In the formula: ε--the composition error of electric power meter;

ε _W1, ε _W2, ε _W3The error (%) of-first-phase, second-phase, third phase power ammeter;

f _Ia, δ _Ia, f _Ib, δ _Ib, f _Ic, δ _IcRatio (%) and the angular difference (') of-A phase, B phase, C phase current mutual inductor;

f _Ua0, δ _Ua0, f _Ub0, δ _Ub0, f _Uc0, δ _Uc0Ratio (%) and the angular difference (') of-A phase, B phase, C phase voltage mutual inductor;

f _A0, δ _A0, f _B0, δ _B0, f _C0, δ _C0-be respectively ratio (%) and the angular difference (') of A, B, C phase voltage secondary circuit voltage drop;

P ' ₁, P ' ₂, P ' ₃-AC power energy value that each phase power ammeter records;

-be respectively With

Between,

With

Between, With

Between phase angle;

The A of-electric energy meter place phase voltage, the B of electric energy meter place phase voltage, the C of electric energy meter place phase voltage;

-secondary current phasor.Above-mentioned comparator circuit is that each parameter of electric energy and the composition error thereof of electric power meter compares with each parameter of standard electric energy to metering circuit result of calculation.Above-mentioned writing circuit namely is the micro computer of this instrument or storage unit or the storer of microprocessor 16.This routine display circuit comprises display screen, and display screen is arranged on the panel of electric power meter real time on-line monitoring Instrument shell.The display screen of the display circuit that this is routine can show numerical value, polar plot, curve of each parameter of electric energy metrical and composition error thereof etc.Described this each parameter of instrument electric energy metrical includes: the phase shortage of each phase, open circuit, short circuit, superpressure, under-voltage, overcurrent, current imbalance, phasing degree, power, power factor (PF) etc.This routine electric power meter real time on-line monitoring instrument connects by interface circuit 18 and uploads each parameter of electric energy of real time on-line monitoring, metering and error thereof to host computer.Described host computer can be computing machine and the computer system thereof of various administrative authoritys.Described uploading can adopt wired or wireless public network to carry out.

Embodiment two. electric power meter real time on-line monitoring instrument

This routine electric power meter real time on-line monitoring instrument concrete structure can be united with Fig. 1～Fig. 2 etc. and illustrated, the electric power meter real time on-line monitoring instrument difference of the electric power meter real time on-line monitoring instrument that this is routine and embodiment one has: this routine electric power meter real time on-line monitoring instrument application is in three-phase four wire system, all the other do not state this routine electric power meter real time on-line monitoring instrument, entirely be same as described in the embodiment one, no longer repeat.

Embodiment three. electric power meter real time on-line monitoring instrument

This routine electric power meter real time on-line monitoring instrument concrete structure can be united with Fig. 1～Fig. 2 etc. and illustrated, the electric power meter real time on-line monitoring instrument difference of the electric power meter real time on-line monitoring instrument that this is routine and embodiment one, embodiment two has: this routine electric power meter real time on-line monitoring instrument application is in three-phase three wire system, all the other do not state this routine electric power meter real time on-line monitoring instrument, entirely be same as described in embodiment one, the embodiment two, no longer repeat.

Claims (3)

1. electric power meter real time on-line monitoring instrument, comprise Instrument shell and real-time online electric energy metrical structure thereof, be characterised in that: described real-time online electric energy metrical structure includes: metering or detection voltage and current information, current amplitude and phase value information, secondary circuit voltage drop information, even the metering of the real-time online of the control information of the electric energy metrical information of electric energy meter and above-mentioned each information or testing agency; Described real-time online electric energy metrical structure is provided with the micro computer of real time on-line monitoring, metering, comparison, record, each parameter of demonstration electric energy metrical and error thereof or each electronic circuit of microprocessor and management control thereof.

2. electric power meter real time on-line monitoring instrument according to claim 1 is characterised in that:

A. described each electronic circuit includes: the voltage transformer (VT) of real time on-line monitoring, current transformer and sampling thereof or sample circuit, mould/number conversion circuit, metering circuit, comparator circuit, writing circuit, display circuit, interface circuit;

B. described metering circuit, comparator circuit, writing circuit all are ingredients of micro computer or microprocessor;

C. described display circuit comprises display screen, and display screen is arranged on the panel of electric power meter real time on-line monitoring Instrument shell.

3. electric power meter real time on-line monitoring instrument according to claim 2 is characterised in that: described this electric power meter real time on-line monitoring instrument connects by interface circuit and uploads each parameter of electric energy of real time on-line monitoring, metering and error thereof to host computer.

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