CN105116364B - Canonical measure unit and its method for electrical energy measurement remote online monitoring system - Google Patents
Canonical measure unit and its method for electrical energy measurement remote online monitoring system Download PDFInfo
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- CN105116364B CN105116364B CN201510412087.8A CN201510412087A CN105116364B CN 105116364 B CN105116364 B CN 105116364B CN 201510412087 A CN201510412087 A CN 201510412087A CN 105116364 B CN105116364 B CN 105116364B
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Abstract
The present invention relates to a kind of monitoring systems, disclose a kind of canonical measure unit and its method for electrical energy measurement remote online monitoring system, including electric current input card, voltage input card, load sampling card, error calculation card, motherboard, electric current input card, voltage input card, load sampling card, error calculation card is all connected to motherboard, electric current input card, voltage input card, load sampling card, error calculation card carries out signal transmission by connecting with motherboard between each other, respectively from electric current input card, voltage input card, load sampling card, error calculation card input measurement signal simultaneously passes through signal processing, pass through motherboard outputting standard electrical energy impulse signals again.The present invention uses secondary circuit measurement method and pulse Comparison Method, it is multi-functional that canonical measure, error calculation, off line setting, system calibration etc. are realized by error calculation card, so that monitoring system have strong anti-interference ability with higher reliability, also substantially increase the measurement accuracy of monitoring system.
Description
Technical field
The present invention relates to a kind of monitoring system more particularly to a kind of standards for electrical energy measurement remote online monitoring system
Measuring unit and its method.
Background technique
Electrical energy measurement is the important component of power industry department economic work, guarantee electric energy metering device it is accurate, can
It is the important evidence of organization of production, management and managerial decision by operation.With going deep into for power system reform, especially
It is higher and higher to the technical management requirement of electrical energy measurement monitoring system after separating the factory and network, still, due to the limit of technological means
System, the especially measuring unit in monitoring system, there are still low measurement accuracy, monitoring efficiency is relatively low and round of visits is long,
The troubleshooting problems such as not in time.
The canonical measure unit for being currently used for electrical energy measurement remote online monitoring system is primarily present following problem: first is that surveying
Amount unit lacks secondary circuit measurement method, so that low measurement accuracy, and finally influence the measurement accuracy of monitoring system；Second is that
Measuring unit lacks measurement error detection and computing function, and due to the real-time change of live load condition, power factor is also real
Shi Bianhua's, it is especially influenced by temporary transient process, is also continually changing, measuring unit when systematic error is run at the scene
Lack error-detecting and computing function and greatly reduce measurement accuracy precision, thus greatly reduces the measurement essence of monitoring system
Degree；Third is that not being able to satisfy while monitoring the active or idle mistake of verification major-minor table in the case where being installed with major-minor table for scene
Difference greatly reduces monitoring running efficiency of system.
Summary of the invention
The present invention is directed to the canonical measure unit master for being currently used for electrical energy measurement remote online monitoring system in the prior art
It has the following disadvantages: first is that measuring unit lacks secondary circuit measurement method, so that low measurement accuracy, and finally influence to supervise
The measurement accuracy of examining system；Second is that measuring unit lacks measurement error detection and computing function, due to the reality of live load condition
Shi Bianhua, power factor are also real-time change, are especially influenced by temporary transient process, when systematic error is run at the scene
Be it is continually changing, measuring unit lacks error-detecting and computing function and greatly reduces measurement accuracy precision, thus significantly
Reduce the measurement accuracy of monitoring system；Third is that be not able to satisfy in the case where being installed with major-minor table for scene while monitoring school
The active or reactive power error for testing major-minor table, greatly reduces monitoring running efficiency of system, provides a kind of using secondary circuit measurement
Method and with measurement error detection and calculate and greatly improve the measuring precision for electrical energy measurement remote online monitoring
The canonical measure unit of system.
In order to solve the above-mentioned technical problem, the present invention is addressed by following technical proposals:
For the canonical measure unit of electrical energy measurement remote online monitoring system, including electric current input card, voltage input card,
Load sampling card, motherboard, electric current input card, voltage input card, load sampling card are all connected to motherboard, further include being connected to motherboard
Error calculation card, electric current input card, voltage input card, load sampling card, error calculation card between each other by with motherboard
Connection carries out signal transmission, respectively from electric current input card, voltage input card, load sampling card, error calculation card input measurement letter
Number and pass through signal processing, then by motherboard outputting standard electrical energy impulse signals to standard electrical energy pulse output terminal.Electric current is defeated
Enter card, voltage input card, load sampling card, error calculation card and is equipped with card insertion head, electric current input card, voltage input card, load
Sampling card, error calculation card carry out signal transmission by connecting with the card insertion head on motherboard between each other.
Canonical measure unit mainly carries out remote verification, real-time to the characterisitic parameter of TA and TV to the electric energy meter of on-line operation
On-line monitoring, and secondary circuit failure is judged.
Monitoring system acquires the pulse of on-line operation electric energy meter, voltage, current signal by multichannel precision, then by acquisition
Signal carries out the verification of A/D conversion and data processing realization to the electric energy meter of live muti-piece on-line operation.The number of verification and detection
It is stored in when factually in system industrial personal computer hard disk, verification data can be directly read at the scene, it can also be by a variety of long-range logical
News mode is transmitted to background PC computer, and back-stage management center can change feelings by receiving the precision of the data monitoring field electric energy table
Condition, to be handled in time failure electric energy meter.
Monitoring system is using access TA secondary circuit and the side in parallel for accessing TV secondary circuit that test loop is connected respectively
Method test, not only can guarantee that current loop will not open a way, but also can guarantee current sample not to influence the measurement accuracy of system.Using 16
The digital processing core of multi-channel a/d converter, high speed carries out Digital Signal Processing, and controls other electronic circuits and realize difference
The switching in channel, to achieve the purpose that test the progress loop test of live multichannel or specific electric energy meter.
Monitoring system by long-range backstage PC and can be configured test request, including test request and alarm door
Limit value carries out data management using the Data Analysis Software with friendly, user-centered interface, user is facilitated to realize to real-time detection
The modern management of data.
Preferably, voltage input card is equipped with voltage channel switching relay, function selective relay group, A/D conversion
Device, CPLD module, first microprocessor pass through electric resistance partial pressure between voltage channel switching relay and function selective relay group
Circuit connection is connected between function selective relay group and A/D converter by program-controlled operational amplifier circuit, CPLD module respectively with A/
D converter, first microprocessor connection, CPLD module, first microprocessor are connect with error calculation card, and function selects relay
Device group is connected with electric current input card, load sampling card respectively；First microprocessor controls CPLD module and exports three road frequency signals,
Output sampling time sequence signal enters A/D converter all the way, and outputting standard electrical energy pulse error signal is to error calculation card all the way, separately
Outputting standard electrical energy impulse signals are to standard electrical energy pulse output terminal all the way.
Preferably, the standard electric energy arteries and veins that error calculation card is equipped with the second microprocessor, connect with the second microprocessor
Rush error calculating module, the second microprocessor be connected with pulse passage control signal power source isolation circuit, pulse power isolation and
Shaping circuit, pulse passage control signal power source isolation circuit be isolated with the pulse power and shaping circuit between be connected with pulse lead to
Road switching circuit, pulse passage switching circuit are connected with pulse input protection circuit, and the second microprocessor and voltage input card connect
It connects, standard electrical energy pulse error calculating module is connect with motherboard, and standard electrical energy pulse error signal is output to standard electrical energy pulse
Error calculating module.
Preferably, load sampling card is equipped with CT load voltage sampling module, current channel switching module, voltage channel
Switch relay, the first to the tenth road CT secondary voltage inputs 30 CT load voltage sampling modules, CT by input terminal
Load voltage sampling module is connect with current channel switching module, and current channel switching module is connected to motherboard by card insertion head；
First to fourth road PT secondary current switches relay by input terminal input voltage channel, and voltage channel switches relay warp
Current-voltage conversion circuit is simultaneously connected to motherboard by card insertion head.
Preferably, the relay that electric current input card is equipped with current transformer, connect with current transformer, relay packet
The relay gate for including short circuit relay, being connect with short circuit relay.
Preferably, electric current input card includes parallel arrangement of first electric current input card and the second electric current input card, first
The input of the first electric current is inputted by input terminal respectively to the 5th road three-phase current signal, the 6th to the tenth road three-phase current signal
Card, the second electric current input card；No. first to fourth ammeter terminal voltage signal, first to fourth road PT secondary voltage signal pass through defeated
Enter terminal input voltage input card；First to the tenth road major-minor table has idle pulse signal to calculate by input terminal error originated from input
Card, error calculation card pass through interface respectively and are connected with industrial personal computer, reset control box；First to fourth road PT secondary current signal,
First to the tenth road CT secondary voltage signal inputs load sampling card by input terminal；Keyboard is connected on motherboard.
Preferably, No. first to fourth ammeter terminal voltage signal, first to fourth road PT secondary voltage signal are by defeated
Enter the parallel input voltage input card of terminal, No. first to fourth ammeter terminal voltage signal is successively logical through overvoltage by input terminal
Road switches relay, resistor voltage divider circuit, function selective relay group, input a/d converter after program-controlled operational amplifier circuit, first to
4th road PT secondary voltage signal successively passes through voltage channel by input terminal and switches relay, resistor voltage divider circuit, function
Input a/d converter after selective relay group, program-controlled operational amplifier circuit.
Preferably, first to fourth road PT secondary current signal, the first to the tenth road CT secondary voltage signal are by defeated
Enter terminal and input load sampling card parallel, first to fourth road PT secondary current signal successively passes through function choosing by input terminal
Input a/d converter after relay group, program-controlled operational amplifier circuit is selected, the first to the tenth road CT secondary voltage signal passes through input terminal
The successively input a/d converter after function selective relay group, program-controlled operational amplifier circuit.
Preferably, the second microprocessor connect with control box is resetted, the second microprocessor by RS232 communicating circuit and
Industrial personal computer connection, the second microprocessor are connect by display driver circuit with keyboard, and the second microprocessor is logical by electric current respectively
Road switch-over control signal driving circuit, voltage channel switch-over control signal driving circuit are connected to motherboard.
Preferably, further including power card, power card is equipped with card insertion head, power supply cartoon as power supply, power card
It crosses card insertion head and is connected to motherboard realization power supply.
First electric current input card, the second electric current input card, voltage input card, error calculation card, load sampling card, power card
It is installed on cabinet rear panel, forms plate card type mounting structure.The input/output signal of rear panel terminal is connected to the first electric current
Input card, the second electric current input card, voltage input card, error calculation card, six pieces of load sampling card, power card boards, the first electricity
Flow input card, the second electric current input card, voltage input card, error calculation card, load sampling card, power card each piece of board respectively
It is connect with six card slots on motherboard, motherboard plays a part of the connection of the signal between each board, in addition also plays fixation
The effect of each piece of board.
Every road electric current is three-phase input, and every phase one positive one is negative.Every phase current installs a current transformer, the first electric current
15 current transformers are respectively arranged on input card and the second electric current input card.Each current transformer is carried out with two relays
Switching, is functionally divided into short circuit relay and relay gate, so being equipped with 30 switching relays on each electric current board
Device.
0-5A electric current is inputted from the primary side of current transformer, secondary side exports 0-20mA low current signal, from error meter
Calculate the on-off of control signal control short circuit relay and relay gate that card output comes；Channel current is strobed, be shorted after
Electric appliance disconnects, relay gate closure, Current Transformer Secondary 0-20mA low current, that is, exportable；Channel current is not strobed,
Short circuit relay closure, relay gate disconnect, and secondary winding in current transformer and short circuit relay form closed loop, in addition
Relay gate is off-state, and 0-20mA low current does not export, and the closure of short circuit relay is to guarantee current transformer
Secondary be not open.
The relay control signal of first electric current input card and the second electric current input card two boards card is independent, the first electricity
Input card and the second electric current input card are flowed in totally ten road electric currents, and at most only electric current is strobed all the way always.
Load sampling card is sampled 30 CT load voltage signals on live ten channel circuit routes respectively,
And 12 PT load current signals on live four sections of busbar voltage routes are sampled, obtain the appropriate signals for measurement
The channel selecting for carrying out electric current and voltage afterwards, by error calculation card, through the control signal behavior that comes of motherboard connection, some is specific logical
Then the three-phase CT load voltage signal for choosing channel and three-phase PT load current signal are connected to voltage input through motherboard by road
Card carries out load measurement calculating.
Voltage input card is equipped with multi-channel a/d converter and for sampling the first microprocessor of calculating.Electric current input
The three-phase current signal being strobed in card has been input in voltage input card, the CT load sampling voltage signal in load sampling card
It has also all been input in voltage input card, has been added from voltage input card rear panel voltage itself with PT load sampling current signal
No. first to fourth ammeter end voltage input signal and the first to fourth road end PT voltage input signal of input terminal input, warp
After channel controls relay gating, ammeter end voltage sampling signal obtained from electric resistance partial pressure and the end PT voltage sampling letter are carried out
Number.One, which shares five class three-phase signals needs, measures.And multi-channel a/d converter can at most measure two class three-phase signals,
This just needs to carry out the selection of signal classification according to different functions.
When carrying out error checking function, the standard electric energy at ammeter end only need to be measured, so only needing to measure three-phase kilowatt-hour meter
Terminal voltage signal and three-phase current signal；When carrying out PT secondary voltage drop measurement function, three-phase kilowatt-hour meter end electricity need to be only measured
Pressure and the end three-phase PT voltage；When carrying out PT load measurement function, three-phase PT end voltage and three-phase PT load need to be only measured
Sampling current；When carrying out CT load measurement function, three-phase CT load sampling voltage and three-phase current need to be only measured.
The gating signal of two program-controlled operational amplifier circuits in voltage input card circuit two channel groups respectively carries out program-controlled put
Greatly.
Voltage channel switches relay and is responsible for carrying out four choosings to No. four ammeter end input voltages and the four road end PT input voltages
One switching.
Resistor voltage divider circuit carries out electric resistance partial pressure sampling to ammeter end input voltage and the end PT input voltage respectively.
CPLD module completes the generation of the sampling time sequence signal of A/D converter and the output of two-way electrical energy pulse.
First microprocessor is then responsible for sampling calculating and data processing.
Error calculation card is responsible for multiplex pulse input and voltage, electric current and pulse passage switching, calibration pulse input, error
It calculates, is interrogated with voltage input cartoon, the control to control box is resetted, with industrial computer communication.
It is TVS pipe and current limiter that pulse input, which protects the main devices of circuit, is connected to the pulse input terminal of rear panel,
In order to avoid access high-voltage signal damages circuit board components, play a part of protection to the internal circuit of circuit board.
The effect of pulse passage switching circuit is to carry out channel to the multiplex pulse signal by pulse input protection circuit
Switching.It controls signal from the second microprocessor pin by the signal after power isolation circuit.
Display driver circuit is used to drive the display data line of liquid crystal display.
Current channel switch-over control signal driving circuit plays a part of controlling current channel signal driving, control
Signal wire is connected to the first electric current input card and the second electric current input card.
Voltage channel switch-over control signal driving circuit plays a part of controlling voltage channel signal driving, control
Signal wire is connected to voltage input card and load sampling card.
Second microprocessor be responsible for calculate electric energy error, issue voltage, electric current, pulse channel switching signal, with industry control
Machine is communicated.
Pulse power isolation and shaping circuit, for carrying out the effect of isolated from power and waveform shaping to pulse signal.
RS232 communicating circuit is connected to the communication port of industrial personal computer, for being communicated with industrial personal computer.
Primary Component on power card is exactly to be made of two Switching Power Supplies and a filter, and a Switching Power Supply provides
The working power of circuit :+5V and ± 15V, another Switching Power Supply provide the switching coil power supply of relay :+24V.
It is the power supply of each board that power circuit, which passes through card insertion head through motherboard cabling,.
For the standard method of measurement of electrical energy measurement remote online monitoring system, including error calculation method, error calculation
Method uses pulse Comparison Method, the relative error calculation formula of pulse Comparison Method are as follows:
Wherein:Set that fixing turn measures according to actual measurement umber of pulse is tested
The calibration pulse number of electric energy meter (4) pulse；The calculation formula of the voltage and current of N number of sampled point and active power point in one cycle
It is notWithWherein Pi、PuRespectively the sampled point of electric current and voltage, K are
Correction factor.
Error testing method are as follows: by the electricity of the input voltage parallel connection access canonical measure unit corresponding channel of field electric energy table
The current input terminal of table end voltage input-terminal, input current series connection access canonical measure unit corresponding channel, and by electric energy
The pulse input terminal of the active and idle pulse access canonical measure unit corresponding channel of table；Canonical measure unit control channel
Switching switch, switches voltage bus and current channel, monitored target is switched to corresponding electric energy meter；In canonical measure unit
There are also one group of function switch to switch for ADC sample circuit front end, when executing error testing, function switch switch converts A/D
Signal in six input channels of device switches to three-phase kilowatt-hour meter end voltage and three-phase current signal；It is adopted in canonical measure unit
The input signal that sample calculates is the voltage and current signal of monitored electric energy meter, so that the voltage of its standard, electricity can be measured
Stream, active power and reactive power electrical parameter, the active pulse of outputting standard or idle pulse；Error calculation card receives mark simultaneously
Quasi- electrical energy pulse and checklist electrical energy pulse, using pulse Comparison Method, the electric energy error for carrying out checklist is calculated.
PT secondary voltage drop test method are as follows: the voltage signal of PT secondary side is passed through into voltage access via telephone line canonical measure unit
The end the PT voltage input-terminal of corresponding channel, along with the ammeter terminal voltage signal accessed；The control of canonical measure unit is logical
Voltage bus, is switched to monitored PT route by road switching switch；Function switch switchs six inputs of A/D converter are logical
Signal on road switches to three-phase kilowatt-hour meter end voltage and the end three-phase PT voltage, using Fourier's calculation formula, while calculating three-phase
The virtual value and initial phase angle of ammeter end voltage and the end three-phase PT voltage obtain the ratio difference and angular difference of PT secondary circuit.
PT secondary load test method are as follows: dedicated punching CT will be installed on the pressure-wire of PT secondary side, obtain PT secondary returning
The current signal on road accesses the PT secondary current input terminal of canonical measure unit corresponding channel, along with the PT accessed
The voltage signal of secondary side；Voltage bus, is switched to monitored PT route by canonical measure unit control channel switching switch；
Signal in six input channels of A/D converter is switched to three-phase PT secondary voltage signal and three-phase PT by function switch switch
Secondary current signal measures the load of PT secondary side.
CT secondary load test method are as follows: by the voltage of CT secondary side access via telephone line canonical measure unit corresponding channel
CT secondary voltage input terminal, along with the current signal of the CT secondary side accessed；Canonical measure unit control channel is cut
Switch is changed, current channel is switched to monitored CT route；Function switch switch will be in six input channels of A/D converter
Signal switch to three-phase CT secondary voltage signal and three-phase CT secondary current signal, measure the load of CT secondary side.
This patent uses High-precision standard measuring unit, and all one group of tested electric energy meter pulses are introduced pulse by scene
Port is compared with the standard electrical energy pulse inside canonical measure unit, to calculate the error of electric energy meter.
Since monitoring system working needle is under the test pattern of one group of electric energy meter, internal system is opened provided with multipath conversion
It closes, when user's difference, is switched to corresponding circuit and is tested, microprocessor is responsible for control, calculating task.Tested electric energy meter
After plurality of voltages and electric current introduce monitoring system, switching is responsible for by multicircuit switch, direct pipe of the switching by microprocessor
Reason, user can realize automatic cycle testing in presupposed information storage to memory by preset time and Control sequence,
Guarantee that entire test process is in good order, enable standard scale synchronization collect the voltage in corresponding circuit, electric current and
Pulse signal.
The test of TV secondary circuit voltage drop: testing for TV secondary circuit voltage drop, needs to draw access via telephone line from TV secondary side
Monitoring system, since monitoring internal system is high impedance unit, the voltage generated on special line is very little, this special line can be connect
Enter to monitor voltage of the system voltage as TV secondary terminals, is then compared by the voltage with electric power meter end, calculates voltage
Ratio difference and angular difference.Since actual track mostly uses greatly bus TV, more electric energy meters can share one group of TV, for TV bis-
The test of minor loop pressure drop uses bus TV for unit, is not required to introduce all pressure drop routes for each table.TV secondary circuit
Pressure fall-off test needs it is synchronous with the acquisition of electric power meter end voltage carry out, be directly compared, calculate with TV secondary terminals voltage
Relevant parameter, as angular difference and ratio are poor.
The Road test of TV secondary circuit: in addition to needing other than TV secondary side extraction voltage access via telephone line monitoring system, also
It needs to obtain the electric current on TV secondary side pressure-wire with dedicated punching current transformer, and accesses monitoring system.For the side of installation
Just, dedicated punching current transformer is needed using open type CT.The arrangement of voltage special line just also meets the survey of TV secondary voltage drop
The demand of examination.There is the voltage and current of TV secondary circuit, calculates its load with regard to simple.
The Road test of TA secondary circuit: need from TA secondary side draw Special electric crimping access monitoring system, TA bis- times
Side voltage is bigger, illustrates that TA bis- times loads are heavier.The access of this voltage, the series connection together with electric energy meter current circuit input,
The load of TA secondary circuit can be calculated.
This patent has the advantages that
Using the combined test mode of canonical measure unit and industrial personal computer, canonical measure unit is easy to disassemble and inspection, and
Industrial personal computer is easy to operate as man-machine interface, and the memory space of its hard disk is very big, and the design for resetting control box has
Effect avoids communicating interrupt caused by due to the crash of industrial personal computer.
Using the synchronous sampling with high precision of 16 multi-channel a/d converters, using high-performance 32-bit microprocessor, core frequency
Up to 120MHz, data channel transmission rate are up to 200kSPS, and current transformer uses active compensation current transformer, cooperation
Flexible programmable operational amplifier realizes 0.05 grade of measurement accuracy.
Voltage circuit is in parallel with energy meter terminal, to prevent monitoring system voltage circuit normally adopting to electric power meter end voltage
Collection, which is constituted, to be influenced, and the voltage circuit circuit design of internal system is inputted at high resistant, and overcurrent or short circuit will not occur for guarantee.
Monitoring system end current loop influences the unimpeded composition of TA secondary circuit in order to prevent, monitors the every road of internal system
Electric current is all made of high-precision punching CT, guarantees that signal acquisition and multicircuit switch not will cause the danger of TA secondary circuit open circuit
Danger.
Since pulse transmission line road may be caused signal distortion, especially in meter constant by the strong magnetic disturbance of substation
It is easier to be disturbed in the case where excessively high.Therefore monitoring system devises shaping pulse in pulse input circuit, effectively prevent
Accidentally pulse signal caused by because of the interference due to.
The case where major-minor table is housed for scene, specially devise major and minor two pieces of electric energy meters on same current loop has
Function and the pulse of idle four tunnel are input to monitoring system simultaneously, can verify the active or reactive power error of two pieces of electric energy meters simultaneously.
Loop test data in monitoring system can be automatically saved in industrial personal computer hard disk, and data are deposited with the format being grouped
Storage can inquire the data being saved according to recording mechanism, while can also be uploaded by Ethernet or GPRS communication modes
To back-stage management center.In addition, setting parameter, such as the mode of connection, label, electric energy constant, alarm parameters also can lead to
Later platform administrative center is sent to monitoring unit.When measuring pressure drop, load and error information, monitoring system can be called automatically and be set
Thresholding is set to be compared with measurement parameter, when exceed threshold value when, system can automatic trigger alarm pulse, realize telephone redialing or
By warning message be stored in warning message memory, background management system can real-time query whether there is or not warning messages.
The present invention has significant technical effect: using secondary circuit measurement method due to using above technical scheme
With pulse Comparison Method, it is multi-functional that canonical measure, error calculation, off line setting, system calibration etc. are realized by error calculation card,
So that monitoring system has strong anti-interference ability with higher reliability, the measurement for also substantially increasing monitoring system is smart
Degree.
Detailed description of the invention
Fig. 1 is principle frame of the present invention for the canonical measure unit embodiment of electrical energy measurement remote online monitoring system
Figure.
Fig. 2 is the functional block diagram of voltage input card embodiment of the present invention.
Fig. 3 is the functional block diagram of error calculation card embodiment of the present invention.
Fig. 4 is the structural schematic diagram of voltage input card embodiment of the present invention.
Fig. 5 is the structural schematic diagram of error calculation card embodiment of the present invention.
Fig. 6 is the structural schematic diagram that load of the present invention samples card embodiment.
Fig. 7 is the structural schematic diagram of electric current input card embodiment of the present invention.
The toponym that each number designation is referred in attached drawing is as follows: 1- keyboard, 2- standard electrical energy pulse output terminal, 3-
Motherboard, 4- card insertion head, 5- electric current input card, 6- input terminal, 7- voltage input card, 8- reset control box, 9- industrial personal computer, 10-
Error calculation card, 11- load sampling card, 12- power card, 13- voltage channel switch relay, 14- resistor voltage divider circuit, 15-
Function selective relay group, the program-controlled operational amplifier circuit of 16-, 17-A/D converter, 18-CPLD module, 19- first microprocessor, 20-
Standard electrical energy pulse error calculating module, 21-RS232 communicating circuit, 22- pulse input protection circuit, the isolation of the 23- pulse power
And shaping circuit, 24- pulse passage switching circuit, 25- pulse passage control signal power source isolation circuit, the second micro process of 26-
Device, 27- display driver circuit, 28- current channel switch-over control signal driving circuit, 29- voltage channel switch-over control signal drive
Dynamic circuit, 30-CT load voltage sampling module, 31- current channel switching module, 32- current-voltage conversion circuit, 33- electric current
Mutual inductor, 34- relay, the first electric current of 51- input card, 52- the second electric current input card.
Specific embodiment
Present invention is further described in detail with embodiment with reference to the accompanying drawing.
Embodiment 1
For the canonical measure unit of electrical energy measurement remote online monitoring system, as shown in figs. 1-7, including electric current input card
5, voltage input card 7, load sampling card 11, motherboard, electric current input card 5, voltage input card 7, load sampling card 11 are all connected to
Motherboard 3, further includes the error calculation card 10 for being connected to motherboard 3, and electric current input card 5, load sampling card 11, misses voltage input card 7
Difference calculates card 10 and carries out signal transmission by connecting with motherboard 3 between each other, respectively from electric current input card 5, voltage input card
7, load sampling blocks 11,10 input measurement signal of error calculation card and passes through signal processing, then passes through 3 outputting standard electric energy of motherboard
Pulse signal is to standard electrical energy pulse output terminal 2.Electric current input card 5, voltage input card 7, load sampling card 11, error calculation
Card 10 is equipped with card insertion head 4, and electric current input card 5, voltage input card 7, load sampling card 11, error calculation card 10 are equal between each other
Signal transmission is carried out by connecting with the card insertion head 4 on motherboard 3.
Voltage input card 7 be equipped with voltage channel switching relay 13, function selective relay group 15, A/D converter 17,
CPLD module 18, first microprocessor 19 pass through electricity between voltage channel switching relay 13 and function selective relay group 15
It hinders bleeder circuit 14 to connect, be connected between function selective relay group 15 and A/D converter 17 by program-controlled operational amplifier circuit 16,
CPLD module 18 is connect with A/D converter 17, first microprocessor 19 respectively, CPLD module 18, first microprocessor 19 with
Error calculation card 10 connects, and function selective relay group 15 is connect with electric current input card 5, load sampling card 11 respectively；First is micro-
Processor 19 controls CPLD module 18 and exports three road frequency signals, exports sampling time sequence signal all the way and enters A/D converter 17, and one
Road outputting standard electrical energy pulse error signal is to error calculation card 10, another output standard electrical energy impulse signals to standard electric energy
Pulse output terminal 2.
The standard electrical energy pulse mistake that error calculation card 10 is equipped with the second microprocessor 26, connect with the second microprocessor 26
Poor computing module 20, the second microprocessor 26 are connected with pulse passage control signal power source isolation circuit 25, pulse power isolation
And shaping circuit 23, pulse passage control signal power source isolation circuit 25 be isolated with the pulse power and shaping circuit 23 between connect
There is pulse passage switching circuit 24, pulse passage switching circuit 24 is connected with pulse input protection circuit 22, the second microprocessor
26 connect with voltage input card 7, and standard electrical energy pulse error calculating module 20 is connect with motherboard 3, standard electrical energy pulse error letter
Number it is output to standard electrical energy pulse error calculating module 20.
Load sampling card 11 is equipped with CT load voltage sampling module 30, current channel switching module 31, voltage channel and cuts
Relay 13 is changed, the first to the tenth road CT secondary voltage inputs 30 CT load voltage sampling modules 30 by input terminal,
CT load voltage sampling module 30 is connect with current channel switching module 31, and current channel switching module 31 is connected by card insertion head 4
It is connected to motherboard 3；First to fourth road PT secondary current switches relay 13 by 6 input voltage channel of input terminal, and voltage is logical
Road switches relay 13 through current-voltage conversion circuit 32 and is connected to motherboard 3 by card insertion head 4.
The relay 34 that electric current input card 5 is equipped with current transformer 33, connect with current transformer 33, relay 34 wrap
The relay gate for including short circuit relay, being connect with short circuit relay.
Electric current input card 5 includes parallel arrangement of first electric current input card 51 and the second electric current input card 52, and first to the
Five road three-phase current signals, the 6th to the tenth road three-phase current signal input the first electric current input card by input terminal 6 respectively
51, the second electric current input card 52；No. first to fourth ammeter terminal voltage signal, first to fourth road PT secondary voltage signal pass through
6 input voltage input card 7 of input terminal；First to the tenth road major-minor table has idle pulse signal to miss by the input of input terminal 6
Difference calculates card 10, and error calculation card 10 is connected with industrial personal computer 9 by interface respectively, resets control box 8；First to fourth road PT bis-
Primary current signal, the first to the tenth road CT secondary voltage signal input load sampling card 11 by input terminal 6；Connect on motherboard 3
It is connected to keyboard 1.
No. first to fourth ammeter terminal voltage signal, first to fourth road PT secondary voltage signal pass through input terminal 6 simultaneously
Row input voltage input card 7, No. first to fourth ammeter terminal voltage signal are successively switched by voltage channel by input terminal 6
Input a/d converter 17 after relay 13, resistor voltage divider circuit 14, function selective relay group 15, program-controlled operational amplifier circuit 16, the
One to the 4th road PT secondary voltage signal successively switches relay 13, electric resistance partial pressure electricity by voltage channel by input terminal 6
Input a/d converter 17 after road 14, function selective relay group 15, program-controlled operational amplifier circuit 16.
First to fourth road PT secondary current signal, the first to the tenth road CT secondary voltage signal pass through input terminal 6 simultaneously
Row input load sampling card 11, first to fourth road PT secondary current signal by input terminal 6 successively by function selection after
Input a/d converter 17 after electric appliance group 15, program-controlled operational amplifier circuit 16, the first to the tenth road CT secondary voltage signal pass through input terminal
The 6 successively input a/d converter 17 after function selective relay group 15, program-controlled operational amplifier circuit 16 of son.
Second microprocessor 26 is connect with control box 8 is resetted, and the second microprocessor 26 passes through RS232 communicating circuit 21 and work
Control machine 9 connects, and the second microprocessor 26 is connect by display driver circuit 27 with keyboard 1, and the second microprocessor 26 passes through respectively
Current channel switch-over control signal driving circuit 28, voltage channel switch-over control signal driving circuit 29 are connected to motherboard 3.
It further include power card 12, power card 12 is used as power supply, and power card 12 is equipped with card insertion head 4, and power card 12 is logical
It crosses card insertion head 4 and is connected to the realization power supply of motherboard 3.
For the standard method of measurement of electrical energy measurement remote online monitoring system, including error calculation method, error calculation
Method uses pulse Comparison Method, the relative error calculation formula of pulse Comparison Method are as follows:
Wherein:Set that fixing turn measures according to actual measurement umber of pulse is tested
The calibration pulse number of electric energy meter (4) pulse；The calculation formula of the voltage and current of N number of sampled point and active power point in one cycle
It is notWithWherein Pi、PuRespectively the sampled point of electric current and voltage, K are
Correction factor.
In short, the foregoing is merely presently preferred embodiments of the present invention, it is all according to equalization made by scope of the present invention patent
Variation and modification, shall all be covered by the patent of the invention.
Claims (1)
1. being used for the standard method of measurement of electrical energy measurement remote online monitoring system, it is characterised in that: including error calculation method,
Error calculation method uses pulse Comparison Method, the relative error calculation formula of pulse Comparison Method are as follows:
Wherein:The tested electric energy that fixing turn measures is set according to actual measurement umber of pulse
The calibration pulse number of table pulse；The voltage and current of N number of sampled point and the calculation formula of active power are respectively in one cycleWithWherein Pi、PuThe respectively sampled point of electric current and voltage, K are amendment
Coefficient, wherein PmFor voltage or current from 1 into N number of waveform sampling point any one sampled point；
The error calculation method the following steps are included:
(1) by the ammeter end voltage input end of the input voltage parallel connection access canonical measure unit corresponding channel of tested electric energy meter
The current input terminal of son, input current series connection access canonical measure unit corresponding channel, and by the active and idle of electric energy meter
The pulse input terminal of pulse access canonical measure unit corresponding channel；
(2) canonical measure unit control channel switching switch, switches voltage bus and current channel, monitored target is switched
To tested electric energy meter；
(3) function switch switch by the signal in six input channels of A/D converter switch to tested electric power meter end voltage and
Three-phase current signal；
(4) voltage and current signal that the input signal calculated is tested electric energy meter is sampled in canonical measure unit, thus just
Voltage, electric current, active power and the reactive power electrical parameter of its standard, the active pulse of outputting standard or idle arteries and veins can be measured
Punching；
(5) error calculation card receives standard electrical energy pulse and tested electrical energy meter electricity energy impulse simultaneously, using pulse Comparison Method, into
The electric energy error of the tested electric energy meter of row calculates.
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| CN106018947A (en) * | 2016-06-23 | 2016-10-12 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Electrical energy metering system and method |
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| CN109459721A (en) * | 2018-12-29 | 2019-03-12 | 珠海安瑞通电子科技有限公司 | A kind of multi-epitope electric energy error meter and high-voltage electric energy meter error testing system |
| CN110174574A (en) * | 2019-06-20 | 2019-08-27 | 江苏方天电力技术有限公司 | Integrated protection and monitoring device electrical measurement calibrating installation and electric flux calibration method |
| CN111122964B (en) * | 2019-12-20 | 2022-06-10 | 北京五力泰科技有限公司 | Electric energy metering method and system |
| CN112710976B (en) * | 2020-12-07 | 2023-03-21 | 山东通源电气有限公司 | Intelligent distribution box test bench |
| CN113555201B (en) * | 2021-07-22 | 2022-08-16 | 烟台东方威思顿电气有限公司 | High-precision open-close type current transformer and data sampling method thereof |
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Address after: 314000 No. 176, Xinqiao North Road, Wuyuan Town, Haiyan County, Jiaxing City, Zhejiang Province Patentee after: ZHEJIANG HARNPU POWER TECHNOLOGY Co.,Ltd. Patentee after: STATE GRID ZHEJIANG ELECTRIC POWER COMPANY LIMITED ELECTRIC POWER Research Institute Address before: 314000 No. 176, Xinqiao North Road, Wuyuan Town, Haiyan County, Jiaxing City, Zhejiang Province Patentee before: ZHEJIANG HARNPU POWER TECHNOLOGY Co.,Ltd. Patentee before: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID ZHEJIANG ELECTRIC POWER Co. |
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Effective date of registration: 20220322 Address after: 314399 No. 678, Chang'an North Road, Wuyuan street, Haiyan County, Jiaxing City, Zhejiang Province Patentee after: ZHEJIANG HARNPU POWER TECHNOLOGY Co.,Ltd. Patentee after: Marketing service center of State Grid Zhejiang Electric Power Co.,Ltd. Address before: 314000 No. 176, Xinqiao North Road, Wuyuan Town, Haiyan County, Jiaxing City, Zhejiang Province Patentee before: ZHEJIANG HARNPU POWER TECHNOLOGY Co.,Ltd. Patentee before: STATE GRID ZHEJIANG ELECTRIC POWER COMPANY LIMITED ELECTRIC POWER Research Institute |
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