CN102507995B - Online electric quantity compensating device - Google Patents
Online electric quantity compensating device Download PDFInfo
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- CN102507995B CN102507995B CN 201110355533 CN201110355533A CN102507995B CN 102507995 B CN102507995 B CN 102507995B CN 201110355533 CN201110355533 CN 201110355533 CN 201110355533 A CN201110355533 A CN 201110355533A CN 102507995 B CN102507995 B CN 102507995B
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Abstract
The invention relates to an online electric quantity compensating device which is mainly technically characterized by comprising a power circuit, an analog channel circuit, an A/D (Analog to Digital) conversion module, a counting processor circuit and a master controller circuit, wherein the power circuit is connected with the A/D conversion module, the counting processor circuit and the master controller circuit and used for supplying power to all the circuits; the analog channel circuit is connected with a junction box of an electric energy meter; and the analog channel circuit, the A/D conversion module, the counting processor circuit and the master controller circuit are sequentially connected together. The online electric quantity compensating device is reasonable in design and can be widely used for occasions requiring three-phase three-wire and three-phase four-wire electric energy meters with various voltage grades, which are provided with current transformers; the consumed meter electric quantity during meter replacing can be accurately recorded when a working staff replaces a meter on load without power outage; functions of browsing, inquiring, reporting and printing a test result are achieved; loss of electric quantity of enterprises is effectively avoided; and reasonable and impartial electric consumption transaction between electric power enterprises and electric consumption customers is ensured.
Description
Technical field
The invention belongs to the electric energy metrical field, especially a kind of online electric weight is remedied device.
Background technology
It is working the most frequently of being engaged in of the dress table personnel of class that electric energy meter is changed, no matter be phase three-wire three or three-phase and four-line, so long as the measuring apparatus of belt current mutual inductor, secondary circuit all will install terminal box additional.Table is changed at the scene time can not needed to stop primary equipment and carry out on-load and change table, and when changing table handling, the staff disconnects the every phase current attachment strap closure in the terminal box, voltage attachment strap, makes the table tail behind no-voltage and the electric current, just can change table work.Because behind electric current attachment strap in closed terminal box, the off voltage attachment strap, until loading onto in new table back recovers normally during this period of time, user power utilization is non-metering, thus just related to mention on " electric energy metrical working stamndard " get rid of the table quantity problem.According to the rules requirement, the staff is after changing end of list (EOL), to remedy the interior during this period of time table electric weight that gets rid of, but, in real work, owing to can't accomplish accurately metering electric weight during this period of time at all, can only be by manually carrying out measurements and calculations, and there is very big error, so a lot of electricity consumption clients do not approve the electric weight of remedying that calculates, cause this part electric weight to be difficult to remedy into, therefore in real work, often this part electric weight has just been ignored, thereby influenced electric power enterprise and reasonable, the just electricity consumption transaction of electricity consumption client.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of online electric weight to remedy device, solved the problem that on-load changes electric quantity metering during the table, guaranteed the time of electric-power metering and the precision of electric weight.
The present invention solves its technical matters and takes following technical scheme to realize:
A kind of online electric weight is remedied device, comprise power circuit, analog channel circuit, A/D modular converter, metering processor circuit and main controller circuit, power circuit is connected with main controller circuit respectively to the each several part circuit supply with A/D modular converter, metering processor circuit, the mimic channel passage is connected with the connection box of electric energy meter box, and mimic channel passage, A/D modular converter, metering processor circuit are in the same place successively with main controller circuit.
And described power circuit is connected and composed by feed circuit and power-switching circuit, and the output terminal of power-switching circuit is with A/D modular converter, metering processor circuit are connected with main controller circuit and are the each several part circuit supply respectively.
And described feed circuit are wherein a kind of or their combination of Switching Power Supply feed circuit, power supply adaptor feed circuit, backup battery feed circuit.
And described Switching Power Supply feed circuit are connected with electric energy meter A phase voltage and N line, and the Switching Power Supply feed circuit are connected with power-switching circuit and are the each several part circuit supply; Described power supply adaptor circuit is connected with outside 220V AC power, and an output terminal of this power supply adaptor is connected with power-switching circuit and is the each several part circuit supply, and another output terminal charges to backup battery by charge control module; Described backup battery feed circuit comprise backup battery and charge control module, and the backup battery output terminal is connected with power-switching circuit and is that each several part circuit supply, input end are connected by the power supply power supply adaptor with charge control module be its charging.
And, described analog channel circuit comprises six road current analog input channels and three road alternating voltage analog input channels, and this six road current analogs input channel comprises and connection box of electric energy meter box upper end three road sense channels that are connected and three road measurement channels that are connected with connection box of electric energy meter box lower end; This three road alternating voltages analog input channel is connected mutually with three-phase voltage and the N of connection box of electric energy meter box, and is converted into voltage signal by the precision resistance dividing potential drop.
And the input end of described A/D modular converter is connected by differential mode with three road voltage signals and six road current signals, and the output terminal of this A/D modular converter is connected with the high speed SPI interface of metering processor.
And, the metering processor circuit comprises single-chip microcomputer and metering input/output module, this single-chip microcomputer is connected with the A/D modular converter by the SPI interface, be connected with main controller circuit by the parallel port, be connected metering input/output module outputting standard electrical energy pulse with the metering input/output module by the I/O interface.
And described metering input/output module is made of photoelectric isolating device.
And, described main control processor circuit comprises microprocessor, keyboard, LCDs, storer and master control input/output module, microprocessor is connected with the metering processor circuit by the parallel port, is connected with keyboard, LCDs, storer and master control input/output module by the I/O interface.
And described master control input/output module is made of photoelectric isolating device.
Advantage of the present invention and good effect are:
1, this electric energy is remedied device in conjunction with microprocessor technology and Digital Signal Processing and is adopted direct AC sampling to realize the online accurate function of measuring that gets rid of the table electric weight, it is as a kind of total digitalization, multi-functional, high precision, intelligentized multiparameter power frequency measurement mechanism, for the staff provides technical support and guarantee to getting rid of remedying of electric weight of table, change the foundation that electricity consumption metering during the table provides objective and fair for power department and electricity consumption client provide, guaranteed power department and electricity consumption client's interests simultaneously.
2, this electric energy is remedied device by automatic startup and is closed the mode of electric quantity metering, improved the precision that on-load changes electric quantity metering during the table, begin metering from disconnecting any phase secondary current, stop metering when recovering to connect secondary current, and independent metering between each phase, do not disturb mutually, realize that on-load changes the automatic startup of electric quantity metering during the table and stops, reduce the step of manual operation, effectively reduce the operate miss that manually starts and stop, having guaranteed the time of electric-power metering and the precision of electric weight.
3, this electric energy is remedied device and is realized the automatic measurement functions of power frequency electric parameter measurement such as electric current, voltage, power factor and frequency by direct AC sampling, and can adopt the form of vector plot to show phase relation and angle, for changing the table personnel inspection, understanding the electric power meter wiring and whether correctly provide reference intuitively, guaranteed under the correct prerequisite of measuring apparatus wiring, to realize getting rid of remedying of table electric weight.
4, this electric energy is remedied device and is adopted two control chips to realize that metering and master control control respectively, has improved sampling rate and sensitivity.
5, this electric energy master controller output interface of remedying device can directly print measurement result at the scene, by user's affirmation of signing, also measurement data can be uploaded to PC, or forms printed report and file.
6, this electric energy remedy the metering output port of device can output pulse signal, for standard scale calibrating accuracy of instrument, 5A split-core type meter pulse constant is 3600imp/kWh.
7, this electric energy is remedied device and is adopted multiple power supply power supply mode, has guaranteed the normal use of multiple occasion.
8, the present invention is reasonable in design, can carry out on-load and change and get rid of the table electric weight during when table, accurate recording changed table not having a power failure for the staff, the browsing of test result, inquiry, form and printing function have been realized, can be widely used in the phase three-wire three of being furnished with current transformer and the three-phase and four-line electric energy meter occasion of various electric pressures, avoid the loss of enterprise's electric weight effectively, guaranteed the electricity consumption transaction that electric power enterprise and electricity consumption client are reasonable, just.
Description of drawings
Fig. 1 is circuit block diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the invention is further described:
A kind of online electric weight is remedied device, as shown in Figure 1, comprise power circuit, analog channel circuit, A/D modular converter, metering processor circuit and main controller circuit, power circuit is connected with main controller circuit respectively to the each several part circuit supply with A/D modular converter, metering processor circuit, the mimic channel passage is connected with the connection box of electric energy meter box, mimic channel passage, A/D modular converter, metering processor circuit are in the same place successively with main controller circuit, below the each several part circuit are described respectively:
Power circuit comprises Switching Power Supply feed circuit, power supply adaptor feed circuit, backup battery feed circuit and power-switching circuit.The Switching Power Supply feed circuit are connected with electric energy meter A phase voltage and N line, stream input power supply (Ua, the N) power supply of friendship is provided by the A phase voltage, namely adopt and borrow electric mode to power, its input voltage wide region is 45V～450V, and the Switching Power Supply feed circuit are connected with power-switching circuit and are the each several part circuit supply.The power supply adaptor circuit is connected with outside 220V AC power, by outside 220V ac power supply, one output terminal of this power supply adaptor is connected with power-switching circuit and is the each several part circuit supply, and another output terminal charges to backup battery by charge control module.The backup battery feed circuit comprise backup battery and charge control module, and the backup battery output terminal is connected with power-switching circuit and is that each several part circuit supply, input end are connected by the power supply power supply adaptor with charge control module be its charging.By multiple power supply power supply mode, guaranteed that the present invention can all can normally use in multiple occasion.
The analog channel circuit comprises six road current analog input channels and three road alternating voltage analog input channels.Six road current analog input channels comprise three road sense channels and three road measurement channels, wherein, left side three road electric currents (IA, IB, IC) are sense channel, right side three road electric currents (Ia, Ib, Ic) are measurement channel, during actual place in circuit, three tunnel corresponding detection current sample pincers of left side insert connection box of electric energy meter box upper end respectively by A, B, C, and three road metering currents sampling pincers of right side correspondence insert connection box of electric energy meter box lower end respectively by a, b, c.Three road alternating voltage analog input channels are connected with three-phase voltage and the N phase (Ua, Ub, Uc, N) of connection box of electric energy meter box, are converted into voltage signal by the precision resistance dividing potential drop.Six road current signals of analog channel output are connected with the A/D modular converter with three road voltage signals.
The A/D modular converter is connected three road voltage signals and six road current signals by differential mode, the A/D modular converter is under the control of metering processor, the analog quantity voltage signal and the current signal that receive are converted to digital signal, and transformation result is inputed to the metering processor by high speed SPI interface.
The metering processor circuit comprises single-chip microcomputer and metering input/output module, and this single-chip microcomputer is connected with the A/D modular converter by the SPI interface, is connected with main controller circuit by the parallel port, is connected with the metering input/output module by the I/O interface.After numerical information after single-chip microcomputer is handled A/D modular converter high-speed sampling is carried out high-speed computation, processing processing and the process comprehensive analysis of system, calculate various electric parameter information, by the parallel port it is transferred to main control processor, measure processor simultaneously by metering input/output module outputting standard electrical energy pulse, this metering input/output module adopts photoelectricity spacing output circuit output pulse signal, for standard scale calibrating accuracy of instrument, 5A split-core type meter pulse constant is 3600imp/kWh.
The main control processor circuit comprises microprocessor, keyboard, LCDs, storer and master control input/output module, microprocessor is connected with the metering processor circuit by the parallel port, is connected with keyboard, LCDs, storer and master control input/output module by the I/O interface.Microprocessor is realized man-machine conversation by keyboard interface, and measurement data is deposited in the storer, and this storer adopts nonvolatile memory can preserve 200 groups of measurement data, and can consult data group and the vector plot of having preserved by keyboard; LCDs adopts 5.7 cun large screen color liquid crystal displays, can use duty and the test parameter of Chinese display, and can show three-phase voltage, electric current, phase relation and vector plot with screen, multiple phase relation shows and the vector plot color separation shows more directly perceived; This master control input/output module is made of photoelectric isolating device, can be connected with computing machine or printer by the master control input/output module and carry out exchanges data or printout.
Using method of the present invention and principle of work are: the secondary current line in the top and bottom of connection box of electric energy meter box inserts the current sample pincers respectively, because at electric energy meter between the stage of replacement, the electric current secondary line of terminal box lower end has electric current to flow through all the time, and the electric current secondary line of terminal box upper end had electric current to flow through before changing table handling, (after the interior electric current attachment strap closure of terminal box) no current flows through during changing table, the electric current secondary line of (the electric current attachment strap is opened the back in the terminal box) terminal box upper end has electric current to flow through again after changing the table handling end, therefore by comparing the electric current difference of terminal box top and bottom, can identify electric energy meter and change status of processes, thereby can start and close electric quantity metering automatically.When the electric current attachment strap is closed, difference appears in the electric current of two sampling pincers up and down, device starts this and records electric weight mutually, when the electric current attachment strap disconnects, the electric current of two sampling pincers is identical up and down, device stops this and records electric weight mutually, as two-phase (phase three-wire three Ia, Ic) or three-phase (three-phase and four-line Ia, Ib, when Ic) the electric current attachment strap all disconnects, the electric quantity metering sampling finishes, realized showing the function that electric weight starts and close metering automatically to getting rid of, can the accurate recording on-load change and get rid of the table electric weight during the table, zero-time, concluding time and cumulative time, realize browsing of test result, inquiry, form and printing function.
It is emphasized that; embodiment of the present invention is illustrative; rather than it is determinate; therefore the present invention is not limited to the embodiment described in the embodiment; every other embodiments that drawn by those skilled in the art's technical scheme according to the present invention belong to the scope of protection of the invention equally.
Claims (5)
1. an online electric weight is remedied device, it is characterized in that: comprise power circuit, analog channel circuit, A/D modular converter, metering processor circuit and main controller circuit, power circuit is connected with main controller circuit respectively to the each several part circuit supply with A/D modular converter, metering processor circuit, the mimic channel passage is connected with the connection box of electric energy meter box, and mimic channel passage, A/D modular converter, metering processor circuit are in the same place successively with main controller circuit; Described feed circuit are wherein a kind of or their combination of Switching Power Supply feed circuit, power supply adaptor feed circuit, backup battery feed circuit; Described Switching Power Supply feed circuit are connected with electric energy meter A phase voltage and N line, and the Switching Power Supply feed circuit are connected with power-switching circuit and are the each several part circuit supply; Described power supply adaptor circuit is connected with outside 220V AC power, and an output terminal of this power supply adaptor is connected with power-switching circuit and is the each several part circuit supply, and another output terminal charges to backup battery by charge control module; Described backup battery feed circuit comprise backup battery and charge control module, and the backup battery output terminal is connected with power-switching circuit and is that each several part circuit supply, input end are connected by power supply adaptor with charge control module be its charging; The metering processor circuit comprises single-chip microcomputer and metering input/output module, this single-chip microcomputer is connected with the A/D modular converter by the SPI interface, be connected with main controller circuit by the parallel port, be connected metering input/output module outputting standard electrical energy pulse with the metering input/output module by the I/O interface; Described power circuit is connected and composed by feed circuit and power-switching circuit, and the output terminal of power-switching circuit is with A/D modular converter, metering processor circuit are connected with main controller circuit and are the each several part circuit supply respectively; Described analog channel circuit comprises six road current analog input channels and three road alternating voltage analog input channels, and this six road current analogs input channel comprises and connection box of electric energy meter box upper end three road sense channels that are connected and three road measurement channels that are connected with connection box of electric energy meter box lower end; This three road alternating voltages analog input channel is connected mutually with three-phase voltage and the N of connection box of electric energy meter box, and is converted into voltage signal by the precision resistance dividing potential drop.
2. online electric weight according to claim 1 is remedied device, it is characterized in that: the input end of described A/D modular converter is connected by differential mode with three road voltage signals and six road current signals, and the output terminal of this A/D modular converter is connected with the high speed SPI interface of metering processor circuit.
3. online electric weight according to claim 1 is remedied device, it is characterized in that: described metering input/output module is made of photoelectric isolating device.
4. online electric weight according to claim 1 is remedied device, it is characterized in that: described main control processor circuit comprises microprocessor, keyboard, LCDs, storer and master control input/output module, microprocessor is connected with the metering processor circuit by the parallel port, is connected with keyboard, LCDs, storer and master control input/output module by the I/O interface.
5. online electric weight according to claim 4 is remedied device, it is characterized in that: described master control input/output module is made of photoelectric isolating device.
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| CN 201110355533 CN102507995B (en) | 2011-11-11 | 2011-11-11 | Online electric quantity compensating device |
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| CN 201110355533 CN102507995B (en) | 2011-11-11 | 2011-11-11 | Online electric quantity compensating device |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103454611A (en) * | 2013-08-29 | 2013-12-18 | 深圳市卓联电子有限公司 | Electric energy metering device remote calibration detection system and secondary voltage drop detection method |
| CN103499745A (en) * | 2013-09-26 | 2014-01-08 | 中国恩菲工程技术有限公司 | Electrode impedance measuring system of six-electrode electric furnace |
| CN105974195B (en) * | 2016-06-29 | 2019-02-26 | 杭州华春科技有限公司 | Bypass electric quantity metering device and its metering method |
| CN109507463A (en) * | 2018-12-24 | 2019-03-22 | 国网青海省电力公司海西供电公司 | Electric quantity compensating device and method |
| CN109541300A (en) * | 2019-01-10 | 2019-03-29 | 国网青海省电力公司电力科学研究院 | A kind of the Analysis of energy metering instrument and its application method of count by time sharing |
| CN111721988B (en) * | 2020-06-28 | 2024-05-14 | 珠海普斯雷电子科技有限公司 | Measuring device electricity quantity compensation measuring and calculating instrument and method |
| CN112557720A (en) * | 2020-11-12 | 2021-03-26 | 广西电网有限责任公司南宁供电局 | Emergency metering method for high-supply low-metering voltage phase-loss compensation electric quantity |
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