CN104076321B - On-line monitoring and evaluating system and method for digital electric energy meter - Google Patents

On-line monitoring and evaluating system and method for digital electric energy meter Download PDF

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Publication number
CN104076321B
CN104076321B CN201410321322.6A CN201410321322A CN104076321B CN 104076321 B CN104076321 B CN 104076321B CN 201410321322 A CN201410321322 A CN 201410321322A CN 104076321 B CN104076321 B CN 104076321B
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electric energy
phase
voltage
energy meter
digital electric
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CN201410321322.6A
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CN104076321A (en
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张秋雁
余倩
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贵州电力试验研究院
华中科技大学
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Abstract

The invention provides an on-line monitoring and evaluating system and method for a digital electric energy meter, and belongs to the technical field of electric energy measurement and test. The on-line monitoring and evaluating system comprises a merging unit, a switcher, an RS485 concentrator, a far-end computer, a data transmission unit and a local computer. The digital electric energy meter in actual running is monitored on line for a long time, sensitive factors affecting measurement errors and reliability of the event recording function of the digital electric energy meter are found out, a state evaluation model of a digital electric energy measurement system is set up, and application of new electric energy measurement devices such as an electronic mutual inductor and the digital electric energy meter to the digital substation electric energy measurement system is promoted.

Description

A kind of digital electric energy meter on-line monitoring and assessment system and method

Technical field

The invention belongs to electric energy metrical technical field of measurement and test, more particularly, to a kind of digital electric energy meter on-line monitoring With assessment system and method.

Background technology

With the increasingly propulsion that electric power digitalization develops, the digitized measurement system is increasingly widely applied. Used as the important component part of the digitized measurement system, the demand of digital electric energy meter is also increasing.Digital electric energy meter Input signal be gathered by electronic current, voltage transformer and transmitted to combining unit, meet IEC61850-9-1 or The complete digital signal of IEC61850-9-2 communication protocols.Digital electric energy meter to be input into electric current, voltage digital signal patrols Computing is collected, in theory its active energy metering is without error.But actually due to sampling precision, processor word size and time synchronized Affect etc. factor, error is certainly existed.In actual motion which factor the error in dipping of digital electric energy meter is affected it is larger, Whether digital electric energy meter can also normal work, digital electric energy meter in the case of for example a large amount of higher hamonic waves of extreme operating condition are run into Anomalous event writing task reliability the problems such as, be all to need the object studied.Digital electric energy meter is still located at present In also ununified standards such as developing stage, its calibration method, transmission of quantity value, error judgment and reliabilities, this is to digital The development of electric energy meter and large-scale application bring very big obstruction.

The national standard and vertification regulation of digital electric energy meter are not yet announced at present, and existing research is both for numeral The field-checking of formula electric energy meter, does not mention long-term to digital electric energy meter working condition, online real-time monitoring and assessment, Such as patent of Application No. 201210545604.5《A kind of digital quantity input type electric energy meter on-line calibration device》In mention right The on-line testing method and apparatus of digital electric energy meter.And the metering of current research being primarily directed to property digital electric energy meter is missed Poor detection, such as patent of Application No. 201210447903.5《A kind of digital electricity meter accuracy evaluation system and its side Method》In describe a kind of method that can carry out on-the-spot test to digital electric energy meter, moreover it is possible to analog message frame losing, network storm etc. Abnormality, detects the shunt running of digital electric energy meter, starts and harmonic effects amount, but is not concerned with the exception of digital electric energy meter Event recording function.Clear stipulaties digital electric energy meter should possess electrical network anomalous event note in " digital electric energy meter particular/special requirement " Recording function.

The content of the invention

For above-mentioned technical problem, it is an object of the invention to provide a kind of digital electric energy meter on-line monitoring and assessment System, monitors on-line to the digital electric energy meter of actual motion.By data analysis and contrast, digital electric energy meter is monitored Error in dipping and event recording function reliability.

The present invention provides a kind of digital electric energy meter on-line monitoring and assessment system, including:

Combining unit:For transmitting number to multiple digital electric energy meters and the far-end computer by the switch According to wherein the packet includes voltage digital signal and current digital signal;

Switch:The data that the combining unit Single port is exported are converted to into multichannel data, and by many ways According to exporting respectively to the plurality of digital electric energy meter and the far-end computer;

RS485 hubs:Collect energy value and the anomalous event recording and sending of the plurality of digital electric energy meter metering To the far-end computer;

Far-end computer:The data are received from the switch, voltage, current value is parsed by FFT and is sent To the local computer, and analyse whether that electrical network anomalous event occurs and the electrical network anomalous event is stored, also from described RS485 hubs obtain the energy value of the plurality of digital electric energy meter metering and the anomalous event is recorded and stored;

Data transmission unit:The voltage after the parsing in the far-end computer, current value, the electrical network exception Event, the energy value of the plurality of digital electric energy meter metering and anomalous event record are sent back by communication network The local computer;And

Local computer:Electric energy is calculated according to the voltage after the parsing passed back in the far-end computer, current value The energy value for measuring the electric energy value for calculating with the plurality of digital electric energy meter in value, each metering cycle Once compared, analyzed the long-term on-line operation error in dipping of the plurality of digital electric energy meter;Always according to distal end meter The electrical network anomalous event passed back in calculation machine respectively with the electrical network anomalous event of the plurality of digital electric power table record Record is compared, and analyzes the reliability of the long-term on-line operation event recording function of the plurality of digital electric energy meter.

The present invention also provides a kind of digital electric energy meter on-line monitoring and appraisal procedure, including:

The data that combining unit Single port is exported are converted to multichannel data by step 1 by switch, and are transmitted separately to Far-end computer and multiple digital electric energy meters;

Far-end computer described in step 2 carries out FFT to the data for obtaining, and obtains harmonic voltage, current amplitude And phase difference, and send to the local computer;

Far-end computer described in step 3 reads what the plurality of digital electric energy meter timing was freezed in each metering cycle Electric energy value is simultaneously sent to the local computer, also reads the electrical network anomalous event record of the plurality of digital electric energy meter Number, if the record number changes, records simultaneously according to the anomalous event that abnormality code reads corresponding digital electric energy meter Storage;

Step 4 data transmission unit is electric by the harmonic wave after the parsing in the far-end computer by transmission network Electric energy value and anomalous event note that pressure, current amplitude, the phase difference, the timing of the plurality of digital electric energy meter are freezed The local computer is passed in record back, and the local computer is according to the harmonic voltage after the parsing passed back, current amplitude meter Calculate electric energy value, and with while freezing between the electric energy value of the plurality of digital electric energy meter put contrasted, calculate institute State the error in dipping of multiple digital electric energy meters;

Local computer described in step 5 is according to the harmonic voltage after the parsing passed back, current amplitude and the phase place Difference analyses whether electrical network anomalous event, and is contrasted with the anomalous event record of the plurality of digital electric energy meter, Judge the reliability of the electrical network anomalous event writing function of the plurality of digital electric energy meter.

In general, by the contemplated above technical scheme of the present invention compared with prior art, with following beneficial effect Really:

The present invention finds out the sensitive influence factor of the error in dipping to digital electric energy meter by data analysis and contrast, Promote the appearance as early as possible of digital electric energy meter relevant criterion and perfect;

Arrange each digital electric energy meter timing to be assessed to freeze, to ensure that the data that each digital electric energy meter is passed back are same The data of time point, it is to avoid the error that returned data is caused due to time irreversibility, improve the error in dipping examination of the present invention Precision;

Local computer analyzes the electric current Jing after far-end computer FFT parsings, voltage data to judge whether exception Event, is then contrasted with the abnormal events of digital electric power table record, analysis digital electric energy meter anomalous event record Reliability, promote the electric energy metrical such as electronic mutual inductor and digital electric energy meter new equipment in digital transformer substation electric energy metrical Application in system, the day-to-day operation of effectively solving digital transformer substation electric energy measuring equipment safeguards smart for a long time with electric energy metrical Degree, integrity problem.

Description of the drawings

Fig. 1 is digital electric energy meter of the present invention on-line monitoring and assessment system structural representation.

Specific embodiment

In order that the objects, technical solutions and advantages of the present invention become more apparent, it is right below in conjunction with drawings and Examples The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, and It is not used in the restriction present invention.As long as additionally, technical characteristic involved in invention described below each embodiment Not constituting conflict each other just can be mutually combined.

Fig. 1 show digital electric energy meter on-line monitoring of the present invention and assessment system structural representation.As shown in figure 1, number Word formula electric energy meter is monitored on-line includes that combining unit, switch, far-end computer, RS485 hubs, data are passed with assessment system Defeated unit and local computer.Read from a certain FPDP of combining unit and meet IEC61850-9-1 or IEC61850-9-2 marks Accurate data, then the data of reading are converted to by multichannel data by switch are input into far-end computer and multiple to be assessed Digital electric energy meter.The electric energy data that each digital electric energy meter respectively counts itself is spread out of by RS485 ports, is spread out of Data fit DLT645-2007 stipulations, are calculated the incoming distal end of the continuous data of multiple digital electric energy meters by RS485 hubs Machine.The continuous data of the multiple digital electric energy meters for receiving is sent to data transmission unit by far-end computer by serial ports, number Serial data is converted to into IP data according to transmission unit and local computer is sent to by communication network (such as GPRS).

Far-end computer is obtained after combining unit data, to IEC61850-9-1 or IEC61850-9-2 data from switch Frame is unpacked, and a FFT was done per 1 second, i.e., to 4000 point datas, (data frequency that general combining unit sends is 80 points of each cycle, China's power system is 50hz, i.e., one cycle is 0.02 second, there is 50 cycles in 1 second) do FFT changes Change, electric current, voltage magnitude and the phase difference of 1 to 13 subharmonic are obtained by FFT, and will be calculated by data transmission unit As a result local computer is passed back.In embodiments of the present invention, required precision can be met within 1 second, if the time for taking is oversize, is adopted Sampling point is excessive, causes to calculate very slow;If the time for taking is too short, very little, precision is unsatisfactory for sampled point.

By the way of far-end computer and local computer are combined, far-end computer is mainly reading power meters to the present invention Data and combining unit data, carry out passing local computer back after FFT in real time.Local computer analyzes FFT data, judges Whether electrical network anomalous event there is, the electric energy meter anomalous event contrast passed back with far-end computer, and electric energy value is calculated, with electricity The electric energy value that energy meter is obtained compares.The Main Function of far-end computer is gathered data, and passing data back local analytics can subtract The workload of few far-end computer, improves real-time, and beneficial to jumbo data storage.

Voltage, electric current, phase difference calculating electric flux that local computer is passed back according to data transmission unit, entered per 22 hours Electricity of row adds up.

In embodiments of the present invention, for the digital electric energy meter of 0.2S levels,《DLT645-2007 multifunctional electric energy meters lead to Letter stipulations》Middle regulation digital electric energy meter shows that lowest order is 0.01kWh in energy data, i.e., caused due to registration precision Error is 0.0099kWh to the maximum, is approximately equal to 0.01kW.H it can be seen from error theory, when error is for directional error When can ignore (directional error for electric energy meter error, for the table of 0.2S levels, it is stipulated that error less than 0.2%), then numeral Formula electric energy meter at least will be measuredThat is 15kWh, when 15kWh electricity is measured, is caused due to registration precision Error meets requirement.If calculating with rated voltage 57.7V, rated current 5A, 80% load, the time is neededRead an electric energy meter data within i.e. minimum 21.66 hours, in the present invention in order to carry The effect of high level error analysis, taking the minimum of a value digital electric energy meter energy data of reading in 22 hours carries out error analysis.

Generally, calculate electric flux method have dot product and with two kinds of major ways of FFT, dot product and calculate phase To simple, but the problem of DC maladjustment cannot be overcome.

In traditional electric energy meter design, generally DC component is removed using low pass filter, but this mode is related to And to hardware, cost and product power consumption, volume can be increased.And require that 0 hertz is in passband in stopband, 50 hertz, to filtering The frequency characteristic of device requires higher;And require that 50 hertz of fundametal compoment is undistorted and pass through, to the damped coefficient of wave filter with Quality factor also require that higher.

If calculating electric flux using fft algorithm merely, algorithm is complicated high to hardware requirement, and inevitably produces frequency Rate leakage problem, affects measuring accuracy.Especially when non-synchronous sampling problem occurs in combining unit, error is larger.In emulation ring It it is 49.5 hertz in sample frequency under border, when electric current, voltage are 50 hertz, FFT non-synchronous sampling electric currents, voltage are relative by mistake Difference is up to 25% or so.

In embodiments of the present invention, electric energy value is calculated using dot product and the method combined with FFT.

Far-end computer is obtained after data from switch, IEC61850-9-1 or IEC61850-9-2 Frames are solved Bag, a FFT was done per 1 second, and by FFT the voltage magnitude V of DC component is obtainedos, current amplitude Ios.From electricity Deduct after direct current component value in stream, voltage signal, recycle dot product and mode to calculate electric flux.Electric energy value W per secondsCalculate It is as follows:

Wherein, Ii、ViRepresent of electric current, magnitude of voltage respectively at i-th point, i=1,2 ..., 4000.

A total electricity was read per 22 hours, charge value that will be per second in 22 hours is added up, and obtains 22 hours Total electricity W is:

The active total electric energy of combination that far-end computer reads each digital electric energy meter metering every 22 hours active requests is simultaneously Storage.

Digital electric energy meter can not pass through the timing of RS485 interfaces actively to computer reported data, therefore in existing method Typically digital electric energy meter real time electrical quantity data are gathered by the way of automatic regular polling.Computer is respectively to each numeral to be assessed Formula electric energy meter sends reads real time data order, and digital electric energy meter receives order backcasting machine returning real-time data.But this Planting polling method cannot ensure the synchronism of returned data.Because the time that each digital electric energy meter receives order may differ Cause, the reaction time of each producer's digital electric energy meter is likely to differ, cause to be transmitted back to is the data of different time points, from And bring error to monitoring system.The error estimation caused because returned data is asynchronous is analyzed as follows:

All it is from main website to by the selection of message frame address domain when specifying that every time communication starts in DLT645/2007 agreements Slave station sends request command frame, and requested slave station received and responded after command frame.Command frame is generally 26 bytes, rings Answer frame be generally 22 bytes (Frame up to 22 bytes in DLT645/2007 agreements, main website before sending the information, first The lead byte of 4 bytes is sent to wake up recipient), each byte 11, electric energy meter receives the response time delay Td after command frame: 20ms≤Td≤500ms.Main website sends and pause between every byte 500ms, and receiving data is without pause.It is 9600bps by bit rate Calculate, then send reading data command frame from computer and frame energy data required time t is received and returned to digital electric energy meter For:

Therefore, the real time data of digital electric energy meter is read using polling method, at least produces 12.58s's between every piece of table Error.If there is N blocks digital electric energy meter to be assessed, first piece is caused and nth block between because the reading duration is asynchronous Error can reach 12.58Ns.If the electric quantity data for reading a digital electric energy meter in 24 hours, first piece digital with nth block Electricity error between electric energy meter is:

For the digital electric energy meter of 0.2S levels, relative error maximum must not exceed 0.2%.Specify in error theory, mark The error of quasi- device can account for the 1/3 to 1/10 of error, it can thus be assumed that the error caused when time irreversibility is less than digital Electric energy meter overall error 0.2% 1/3 to 1/10 when, you can ignore.Then have:

0.02%≤0.015N%≤0.067%

1.33≤N≤4.46

N round numbers, i.e., when digital electric energy meter number to be assessed is more than or equal to 5 pieces, just occur that error is exceeded.And Above-mentioned time t is to communicate the most fast time under non-failure conditions, causes data to retransmit if communication is broken down, and t increases, N subtracts It is little.

To solve the above problems, each digital electric energy meter timing to be assessed is set in the present invention and is freezed, it is little every 22 When freeze once current electric energy value, the electric energy value of the time point is stored in electric energy meter after freezing.Work as far-end computer When sending reading order to digital electric energy meter, each digital electric energy meter is passed the electric energy value for freezing by RS485 ports Go out.Digital electric energy meter can freeze many secondary datas depending on its storage size, and be available for that outer counter is re-reading to be taken.Number is freezed using reading According to method avoid cause because of the time delay of poll obtain the asynchronous problem of data, it is ensured that by all digital electrics to be assessed Energy table in the same time compare by continuous data, improves the error in dipping assessment precision of this programme.Far-end computer is to each to be evaluated The digital electric energy meter estimated sends reads freezing data order, to ensure that the data that each digital electric energy meter is passed back are same time point Data.

To ensure the internal clocking synchronization of each digital electric energy meter to be assessed, system is defined by computer time, daily 24:When 00 pair of all monitored digital electric energy meter is once broadcasted school, caused with control system time irreversibility Error.The time in-synchronization error of the technical program is analyzed as follows:

If the electricity that the algorithm routine of computer is counted in a cycle T is wd, the monitored digital electric power of kth block The electricity that meter is obtained is wk(k=1,2 ... n, n are the sum of monitored digital electric energy meter), monitored digital of kth block The clock of electric energy meter is Δ t with the clock difference of computerk(total time difference is tMy god, Δ t herekRefer to kth block quilt in cycle T The clock of the digital electric energy meter of monitoring and the clock difference of computer, in advance then Δ tkIt is on the occasion of delayed then Δ tkFor negative value).Then The actual metered time of the monitored digital electric energy meter of kth block is T+ Δ t in each cycle TkIf, due to time irreversibility The relative error brought is εk, then:

Carry out analysis time asynchronous error by following two situations:

If the 1, the total time difference of the clock of the clock and computer of digital electric energy meter is t in one dayMy god, (tMy godCan pass through Daily during school before the reading power meters time calculating), if total time difference tMy godIt was equally distributed in one day, then has:

Specified according to DL/T614-2007, the error of time of day of electric energy meter then knows t no more than 0.5s/d by (8)My god≤ 0.5s, by calculating data communication transmission the time required to, T is set to into 22 hours, then Δ tk=0.46s, knows according to formula (1):

If the 2, assuming extreme case Δ t occurk=tMy god, i.e., the time difference t of ammeter in a dayMy godOccur in a T of ammeter In cycle, i.e. Δ tk=0.5S, then known by formula (1):

It can be seen from error theory, when error is directional errorWhen can ignore.0.2S level digital electric energy meters Precision is 0.2%, 0.2%For 0.066%~0.02%, due toIt is general 1 or so, then above-mentioned formula (2) and formula (3) result for calculating is much smaller than 0.066%~0.02%.In sum, read digital electric energy meter using timing in the present invention to freeze Knot data, the error in dipping that time irreversibility is caused between computer and digital electric energy meter is negligible.

Combining unit passes through Ethernet interface by electric current, voltage to meet IEC61850-9-1 or IEC61850-9-2 communication protocols To far-end computer, far-end computer draws electric current, voltage by FFT analytic message to the digital frame format transmission of view Amplitude and electric current, voltage-phase difference.

In embodiments of the present invention, far-end computer reads at set intervals digital electric energy meter (as a example by 2 minutes) The specified Data Identification content of output, obtains digital electric energy meter electrical network anomalous event record number and (is assisted according to DL/T645-2007 View).If record number changes, then reads the anomalous event of digital electric energy meter and record and store.Analyzed by local computer Electric current, voltage data Jing after far-end computer FFT parsings judging whether electrical network anomalous event, and when Which type of electrical network anomalous event there occurs.The Data Identification content for reading digital electric energy meter is a process checked, such as The logout number that really notes abnormalities there occurs change, illustrate that digital electric power table record crosses an electrical network exception in this 2 minutes Data, go to read this anomalous event record further according to corresponding Data Identification, can show it is assorted in the record of digital electric energy meter When there is which type of anomalous event, then record the anomalous event of digital electric energy meter and local computer point The electrical network anomalous event of analysis is contrasted.

In embodiments of the present invention, when there is situations below, then it is assumed that electrical network occurs anomalous event, local computer note Copyist's part occurs, the end time;Event starts, finish time electricity;And anomalous event type.

(1) A, B, C phase decompression

In three-phase (or single-phase) electric power system, certain phase load electric current is more than starting current (0.5%Ib), but voltage circuit Voltage less than digital electric energy meter normal working voltage 78% when (78%Un), and the duration be more than 1 minute.

(2) A, B, C phase is under-voltage, the overvoltage of A, B, C phase

In three-phase (or single-phase) electric power system, the voltage of certain phase voltage circuit is less than normal working voltage 220V or 380V (being defined by electric energy meter nameplate parameter to be assessed) 5% or higher than 5%.

(3) full decompression

If three-phase voltage is below the critical voltage (the 60% of reference voltage lower limit) of digital electric energy meter, and load current More than the state of 5% fundamental current (5%Ib).

(4) A, B, C phase defluidization

In three-phase power supply system, three-phase has voltage more than the critical voltage of digital electric energy meter, arbitrary in three-phase current Phase or two-phase are less than starting current, and other phase line load currents more than the state of 5% fundamental current.

(5) the disconnected phase of A, B, C phase

In three-phase power supply system, mutually there is critical voltage of the voltage less than digital electric energy meter in certain, while load current Less than state of the starting current time more than 60 seconds.

(6) A, B, C phase stops

In three-phase power supply system, mutually there is critical voltage of the voltage less than digital electric energy meter in certain, while load current Less than state of the starting current time more than 60 seconds.

(7) Voltage unbalance rate is not more than 30%

Voltage unbalance rate=((maximum phase voltage-minimum phase voltage)/maximum phase voltage) × 100%.

(8) current imbalance

Current imbalance rate=((maximum phase current-minimum phase current)/maximum phase current) × 100%.

(9) voltage negative phase sequence

The advanced B phases of the advanced A phases of C phase voltages, A phases, the advanced C phases of B phases are then positive phase sequence, are otherwise negative phase sequence.

(10) electric current negative phase sequence

The advanced B phases of the advanced A phases of C phase currents, A phases, the advanced C phases of B phases are then positive phase sequence, are otherwise negative phase sequence.

Table 1 show the record data identification code table of digital electric energy meter electrical network anomalous event.

Table 1

Event Data Identification Event Data Identification A, B, C phase decompression total degree 03010000 Voltage negative phase sequence total degree 03070001 A, B, C phase is under-voltage total degree 03020000 Electric current negative phase sequence total degree 03080000 A, B, C phase overvoltage total degree 03030101 Voltage unbalance total degree 03090000 The disconnected phase total degree of A, B, C phase 03040000 Current imbalance total degree 030A0000 Full decompression total degree 03050000 A, B, C phase stops total degree 030D0000 A, B, C phase defluidization total degree 030B0000

As it will be easily appreciated by one skilled in the art that the foregoing is only presently preferred embodiments of the present invention, not to The present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc. are limited, all should be included Within protection scope of the present invention.

Claims (7)

1. a kind of digital electric energy meter on-line monitoring and assessment system, including combining unit, switch, RS485 hubs, distal end Computer, data transmission unit and local computer, it is characterised in that:
The combining unit:For transmitting number to multiple digital electric energy meters and the far-end computer by the switch According to wherein the packet includes voltage digital signal and current digital signal;The data of the combining unit output are followed IEC61850-9-1 or IEC61850-9-2 communication protocols;
The switch:The data that the combining unit Single port is exported are converted to into multichannel data, and by many ways According to exporting respectively to the plurality of digital electric energy meter and the far-end computer;
The RS485 hubs:Collect energy value and the anomalous event recording and sending of the plurality of digital electric energy meter metering To the far-end computer, the data of the plurality of digital electric energy meter output follow DL/T645-2007 communication protocols;
The far-end computer:The data are received from the switch, voltage, current value is parsed by FFT and is sent To the local computer, and analyse whether that electrical network anomalous event occurs and the electrical network anomalous event is stored, also from described RS485 hubs obtain the energy value of the plurality of digital electric energy meter metering and the anomalous event is recorded and stored; The plurality of digital electric energy meter timing freezing data to be assessed is set, and the far-end computer is to the plurality of digital electric Can table send and read freezing data order, to ensure data that data that the plurality of digital electric energy meter is passed back are same time point;
The data transmission unit:The voltage after the parsing in the far-end computer, current value, the electrical network exception Event, the energy value of the plurality of digital electric energy meter metering and anomalous event record are sent back by communication network The local computer;Specifically, data transmission unit is humorous after transmission network will be parsed in the far-end computer Electric energy value and anomalous event note that wave voltage, current amplitude, phase difference, the timing of the plurality of digital electric energy meter are freezed The local computer is passed in record back, and the local computer is according to the harmonic voltage after the parsing passed back, current amplitude meter Calculate electric energy value, and with while freezing between the electric energy value of the plurality of digital electric energy meter put contrasted, calculate institute State the error in dipping of multiple digital electric energy meters;
The local computer:Electric energy is calculated according to the voltage after the parsing passed back in the far-end computer, current value The energy value for measuring the electric energy value for calculating with the plurality of digital electric energy meter in value, each metering cycle Once compared, analyzed the long-term on-line operation error in dipping of the plurality of digital electric energy meter;Always according to distal end meter The electrical network anomalous event passed back in calculation machine respectively with the electrical network anomalous event of the plurality of digital electric power table record Record is compared, and analyzes the reliability of the long-term on-line operation event recording function of the plurality of digital electric energy meter.
2. digital electric energy meter as claimed in claim 1 is monitored on-line and assessment system, it is characterised in that the local computing Machine carries out an electric energy value in the metering cycle and adds up, and the electric energy measured with the plurality of digital electric energy meter Value is compared.
3. digital electric energy meter as claimed in claim 2 is monitored on-line and assessment system, it is characterised in that the local computing Machine calculates electric energy value W per second using dot product and the method combined with FFTsFor:
W s = Σ i = 1 4000 ( I i - I o s ) × ( V i - V o s ) × 1 4000
Wherein, Ii、ViRepresent of electric current, magnitude of voltage respectively at i-th point, i=1,2 ..., 4000;Ios、VosRepresent respectively described in Jing The current amplitude and voltage magnitude of the DC component that FFT is obtained.
4. digital electric energy meter as claimed in claim 1 or 2 is monitored on-line and assessment system, it is characterised in that daily one When set time point is once broadcasted school to all monitored digital electric energy meters, it is with the far-end computer time It is accurate.
5. digital electric energy meter as claimed in claim 1 or 2 is monitored on-line and assessment system, it is characterised in that the electrical network Anomalous event includes:
(1) A, B, C phase decompression:In three-phase or single phase power supply system, certain phase load electric current is more than starting current, but voltage circuit Voltage less than digital electric energy meter normal working voltage 78% when, and the duration be more than 1 minute;
(2) A, B, C phase is under-voltage or A, B, C phase is over-pressed:In three-phase or single phase power supply system, the voltage of certain phase voltage circuit is less than Normal working voltage 220V or 380V 5% or higher than 5%;
(3) full decompression:Three-phase voltage is below the critical voltage of digital electric energy meter, and load current is more than 5% fundamental current State;
(4) A, B, C phase defluidization:In three-phase power supply system, three-phase has voltage more than the critical voltage of digital electric energy meter, three-phase Arbitrary phase or two-phase are less than starting current, and other phase line load currents more than the state of 5% fundamental current in electric current;
(5) the disconnected phase of A, B, C phase:In three-phase power supply system, mutually there is critical voltage of the voltage less than digital electric energy meter in certain, together When load current be less than state of the starting current time more than 60 seconds;
(6) A, B, C phase stops:In three-phase power supply system, mutually there is critical voltage of the voltage less than digital electric energy meter in certain, together When load current be less than state of the starting current time more than 60 seconds;
(7) Voltage unbalance rate is not more than 30%:Voltage unbalance rate=((maximum phase voltage-minimum phase voltage)/maximum mutually electricity Pressure) × 100%;
(8) current imbalance:Current imbalance rate=((maximum phase current-minimum phase current)/maximum phase current) × 100%;
(9) voltage negative phase sequence:The advanced B phases of the advanced A phases of C phase voltages, A phases, the advanced C phases of B phases are then positive phase sequence, are otherwise anti-phase Sequence;
(10) electric current negative phase sequence:The advanced B phases of the advanced A phases of C phase currents, A phases, the advanced C phases of B phases are then positive phase sequence, are otherwise anti-phase Sequence.
6. a kind of digital electric energy meter is monitored on-line and appraisal procedure, it is characterised in that included:
The data that step 1 exports combining unit Single port are converted to multichannel data by switch, and are transmitted separately to distal end Computer and multiple digital electric energy meters;
Far-end computer described in step 2 carries out FFT to the data for obtaining, and obtains harmonic voltage, current amplitude and phase Potential difference, and send to local computer;
Far-end computer described in step 3 reads the electric energy that the plurality of digital electric energy meter timing is freezed in each metering cycle Value is simultaneously sent to the local computer, also reads the electrical network anomalous event record number of the plurality of digital electric energy meter, if The record number changes, then the anomalous event for reading corresponding digital electric energy meter according to abnormality code is recorded and stored;
Step 4 data transmission unit by transmission network by the far-end computer parse after harmonic voltage, current amplitude, The electric energy value and anomalous event record that phase difference, the timing of the plurality of digital electric energy meter are freezed passes the local meter back Calculation machine, the local computer according to the harmonic voltage after the parsing passed back, current amplitude calculate electric energy value, and with jelly The electric energy value of the plurality of digital electric energy meter put between while knot is contrasted, and calculates the plurality of digital electric energy meter Error in dipping;
Local computer described in step 5 is according to the harmonic voltage after the parsing passed back, current amplitude and the phase difference Whether analysis there is electrical network anomalous event, and be contrasted with the anomalous event record of the plurality of digital electric energy meter, judge The reliability of the electrical network anomalous event writing function of the plurality of digital electric energy meter.
7. method as claimed in claim 6, it is characterised in that the anomalous event type includes:
(1) A, B, C phase decompression:In three-phase or single phase power supply system, certain phase load electric current is more than starting current, but voltage circuit Voltage less than digital electric energy meter normal working voltage 78% when, and the duration be more than 1 minute;
(2) A, B, C phase is under-voltage or A, B, C phase is over-pressed:In three-phase or single phase power supply system, the voltage of certain phase voltage circuit is less than Normal working voltage 220V or 380V 5% or higher than 5%;
(3) full decompression:Three-phase voltage is below the critical voltage of digital electric energy meter, and load current is more than 5% fundamental current State;
(4) A, B, C phase defluidization:In three-phase power supply system, three-phase has voltage more than the critical voltage of digital electric energy meter, three-phase Arbitrary phase or two-phase are less than starting current, and other phase line load currents more than the state of 5% fundamental current in electric current;
(5) the disconnected phase of A, B, C phase:In three-phase power supply system, mutually there is critical voltage of the voltage less than digital electric energy meter in certain, together When load current be less than state of the starting current time more than 60 seconds;
(6) A, B, C phase stops:In three-phase power supply system, mutually there is critical voltage of the voltage less than digital electric energy meter in certain, together When load current be less than state of the starting current time more than 60 seconds;
(7) Voltage unbalance rate is not more than 30%:Voltage unbalance rate=((maximum phase voltage-minimum phase voltage)/maximum mutually electricity Pressure) × 100%;
(8) current imbalance:Current imbalance rate=((maximum phase current-minimum phase current)/maximum phase current) × 100%;
(9) voltage negative phase sequence:The advanced B phases of the advanced A phases of C phase voltages, A phases, the advanced C phases of B phases are then positive phase sequence, are otherwise anti-phase Sequence;
(10) electric current negative phase sequence:The advanced B phases of the advanced A phases of C phase currents, A phases, the advanced C phases of B phases are then positive phase sequence, are otherwise anti-phase Sequence.
CN201410321322.6A 2014-07-08 2014-07-08 On-line monitoring and evaluating system and method for digital electric energy meter CN104076321B (en)

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