CN103513221A - Secondary voltage drop/secondary load on-line monitoring device and system and monitoring method thereof - Google Patents
Secondary voltage drop/secondary load on-line monitoring device and system and monitoring method thereof Download PDFInfo
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Abstract
The invention discloses a secondary voltage drop/secondary load on-line monitoring device and system and a monitoring method thereof. The on-line monitoring device comprises a first communication unit which is used for receiving measurement data, a microprocessor which is used for calculation processing and overall control, a multipath selection unit which is used for selecting access signals which need measurement and sending the access signals to a signal conditioning unit, the signal conditioning unit which is used for conditioning the access signals and carrying out sending to a first frequency multiplication unit, the first frequency multiplication unit which is used for carrying out frequency multiplication on conditioned signals and sending the conditioned signals after frequency multiplication to an analog-to-digital conversion unit, the analog-to-digital conversion unit which is used for sampling the signals to acquire sampling signals, a second communication unit which is used for receiving a control instruction of a front-end processor and sending test data to the front-end processor and a keyboard input unit which is used for inputting a field control instruction into the microprocessor. According to the invention, real-time on-line monitoring can be carried out on load, error and other main parameters of a metering device; manual field measurement is not needed; the workload is reduced; and the work efficiency is improved.
Description
Technical field
The present invention relates to high-voltage fence field of measuring technique, relate in particular to a kind of secondary voltage drop/secondary load on-Line Monitor Device and system and monitoring method thereof.
Background technology
Generating plant and transformer station's high-voltage electric-energy meter, the interests that are related to generating, transmission of electricity, distribution tripartite, high-voltage electric-energy meter is comprised of voltage transformer (VT) (PT), current transformer (CT) and electric energy meter conventionally, accordingly, the error that the composition error of high-voltage electric energy meter measuring apparatus is caused by PT error, CT error, PT secondary voltage drop and several parts such as error of electric energy meter form, very necessary for guaranteeing the calibrating of each error link of accurate measurement ，Dui transformer station.
The calibrating of transformer station's each error link of electric power meter is generally to utilize various portable field error testing instrument to carry out periodic calibration at present, this mode cannot the operating electric power meter links of Real-Time Monitoring error, once measuring apparatus generation problem will make metering lose fairness between two sense cycle, cause electric weight to lose, and traditional portable field check meter, while testing at the scene the error of electric power meter links, each error is that timesharing is measured, isolated irrelevant, therefore cannot measure in real time the composition error of electric power meter, and artificial in-site measurement workload is large, inefficiency, real-time is poor.
Summary of the invention
The technical problem to be solved in the present invention is just: the technical matters existing for prior art, the invention provides a kind of secondary voltage drop/secondary load on-Line Monitor Device with data analysis and computing power, and provide a kind of secondary voltage drop/secondary load on-line monitoring system, can Real-Time Monitoring voltage transformer (VT), the Real-time Error of current transformer and electric energy meter and secondary load, calculating secondary voltage drop, without artificial in-site measurement, the present invention also provides a kind of monitoring method based on this secondary voltage drop/secondary load on-line monitoring system.
For achieving the above object, secondary voltage drop/secondary load on-Line Monitor Device of the present invention, comprises the first communication unit, for receiving, measures the measurement data that extension set is sent to; Microprocessor, carries out integral body control for the test data of sampled signal and the reception of the first communication unit being carried out to the work of computing and Dui Ge unit; Multichannel selected cell, for selecting to need the access signal of measurement, and sends to signal condition unit by the access signal of selection; Signal condition unit, nurses one's health for the access signal that multichannel selected cell is selected, and the signal after conditioning is sent to the first frequency multiplication unit; The first frequency multiplication unit, carries out process of frequency multiplication for the signal to after conditioning, and the signal after frequency multiplication is sent to AD conversion unit; AD conversion unit, for the signal after the first frequency multiplication unit frequency multiplication is sampled, obtains sampled signal; The second communication unit, for receiving front end processor steering order and sending test data to front end processor; Keyboard input block, for inputting field control instruction to microprocessor.In this programme, secondary voltage drop/secondary load on-Line Monitor Device is provided with the first communication unit and second communication unit of communicating by letter with front end processor of measuring extension set for receiving, can be together with measuring extension set the information such as error, secondary load, secondary voltage drop of Real-Time Monitoring voltage transformer (VT), current transformer, electric energy meter, and by front end processor, send to remote monitoring center in time, without artificial field monitoring, workload is little, work efficiency is high.
Further, above-mentioned secondary voltage drop/secondary load on-Line Monitor Device also comprises for sampling reference signal being carried out to the second frequency multiplication unit of process of frequency multiplication, above-mentioned the second frequency multiplication unit is all connected with microprocessor, AD conversion unit, for AD conversion unit provides benchmark sampled signal, secondary voltage drop/secondary load on-Line Monitor Device in this programme is monitored based on same benchmark constantly with measurement extension set, strengthen relevance and the practicality of each error, be convenient to measure in real time the composition error of electric power meter.
Further, above-mentioned the second frequency multiplication unit is digital frequency multiplier, and its quantity is 2, and the quantity of above-mentioned AD conversion unit is also 2, and each digital frequency multiplier connects an AD conversion unit, for selecting two-way access signal and two-way benchmark sampled signal.
Further, above-mentioned keyboard input block comprises keyboard processor and is connected to the button on keyboard processor, for on-the-spot input control order.
Secondary voltage drop/secondary load on-line monitoring system, comprising:
Voltage measuring transformer extension set, is connected to the secondary side circuit of voltage transformer (VT), for secondary load, secondary outgoing line voltage, loop current the calculating voltage transformer error of measuring voltage mutual inductor, and measurement data is sent to measurement main frame;
Current transformer is measured extension set, is connected to Current Transformer Secondary side loop, for measuring secondary load, loop current, the terminal voltage of current transformer and calculating the error of current transformer, and measurement data is sent to measurement main frame;
Measure main frame, measuring extension set with voltage measuring transformer extension set, current transformer is all connected, and be connected to the three-phase secondary circuit of electric energy meter, for electric energy meter error measurement, electric energy meter side input voltage value and input current value measurement, secondary voltage drop, calculate, and result of calculation is sent to front end processor; Above-mentioned measurement main frame is arbitrary above-mentioned secondary voltage drop/secondary load on-Line Monitor Device in claim 1 ~ 4;
Front end processor, stores, shows, sends to remote monitoring center and send order to measuring main frame for this locality of measurement data.
In this programme, measurement main frame, current transformer measurement extension set, voltage measuring transformer extension set have formed the real-time monitoring device of measuring apparatus, measure main frame also for the calculating of secondary voltage drop, these three devices cooperatively interact Real-Time Monitoring measuring apparatus parameters and send to after treatment front end processor, replaced original artificial field monitoring, reduced personnel's working strength, improved workability efficiency, and real-time is good.
Further, above-mentioned front end processor comprises serial ports transceiver module, data analysis module, alarm analysis module, data memory module, communication module, in above-mentioned data memory module, database is installed.In this programme, in front end processor, be provided with data analysis module and alarm analysis module, it can filter out the incomplete or incorrect data of information according to the call format setting in advance, and data are classified, and by sorted proper data storage and send to remote monitoring center, save the storage space of front end processor and remote monitoring center, and reduce calculating and the judgement of remote monitoring center; Alarm analysis module is used for judging whether data surpass alert if, to report to the police, can prevent that abnormal conditions from situation too of a specified duration and undiscovered occurring, this warning can be reported to the police by onsite alarming device, also can to remote monitoring center, report to the police by communication module, can effectively improve the security of system, accelerate abnormal discovery and the processing speed of electrical network.
Further, above-mentioned communication module comprises at least one in both of wire communication module, wireless communication module, and above-mentioned wireless communication module is GPRS wireless module or 3G wireless module, and above-mentioned wire communication module is RS485 communication module or ethernet communication module.
Secondary voltage drop/secondary load on-line monitoring method, comprises voltage transformer (VT) data acquisition step, current transformer data acquisition step, electric energy meter data acquisition step, also comprises and measures main frame overall treatment step and front end processor treatment step; Above-mentioned measurement main frame overall treatment step is specially: measure main frame receiver voltage mutual inductor data summation current transformer data, calculating voltage transformer secondary voltage drop, and the voltage transformer (VT) data of collection, current transformer data, electric energy meter data and the computational data of measuring main frame are shown and send to front end processor; Above-mentioned front end processor treatment step is specially: front end processor receives data from measure main frame, deposits database in, and sends to remote monitoring center.
Further, above-mentioned voltage transformer (VT) data acquisition step is specially: voltage measuring transformer extension set gathers secondary load, the output voltage of secondary side output terminal, the loop current of voltage transformer (VT), calculating voltage transformer error, and the data of collection are sent to measurement main frame by wireless or wired mode;
Above-mentioned current transformer data acquisition step is specially: current transformer is measured secondary load, loop current, the terminal voltage that extension set gathers current transformer, calculate the error of current transformer, and the data of collection are sent to measurement main frame by wireless or wired mode;
Above-mentioned electric energy meter data acquisition step is specially: measure input voltage value and the input current value of main frame multi collect electric energy meter in one-period, and according to the data that gather, calculate effective voltage value, watt current value, power, the electric energy meter error of electric energy meter input;
Above-mentioned three steps are order in no particular order.
Further, in above-mentioned front end processor treatment step, front end processor receives data by serial ports from measure main frame, and front end processor is outputed to data to send to remote monitoring center by RS485 interface or Ethernet interface; In this step, front end processor has also carried out data analysis and alarm analysis after receiving data, before depositing database in:
Data analysis: filter incorrect data according to predefined data protocol type, and data are classified;
Alarm analysis: alert if built-in according to system or that user sets is analyzed data and whether surpassed alert if, if surpassed, starts alarm module.
With respect to prior art, tool of the present invention has the following advantages and beneficial effect:
1, the invention provides main error real-time monitoring device and system and the on-line monitoring method of a kind of transformer station electric power meter, its can real time on-line monitoring measuring apparatus itself the major parameters such as load, error, avoided the electric weight that traditional periodic monitor may cause to lose problem; Also without artificial in-site measurement, reduced workload, improved work efficiency simultaneously.
2, secondary voltage drop/secondary load on-Line Monitor Device of the present invention also accesses sampling reference signal, itself and measurement extension set are monitored constantly at same benchmark, strengthen relevance and the practicality of measuring error, thereby avoided each error timesharing in prior art to measure, isolate the irrelevant problem that causes measuring in real time the composition error of electric power meter;
3, in the front end processor of secondary voltage drop/secondary load on-line monitoring system of the present invention, be provided with data analysis module and can filter out the incomplete or incorrect data of information according to the call format setting in advance, and data are classified, and by sorted proper data storage and send to remote monitoring center, save the storage space of front end processor and remote monitoring center, and reduce calculating and the judgement of remote monitoring center;
4, in the front end processor of secondary voltage drop/secondary load on-line monitoring system of the present invention, be provided with alarm analysis module, be used for judging whether data surpass alert if, to report to the police, can prevent that abnormal conditions from situation too of a specified duration and undiscovered occurring, can effectively improve security, abnormal discovery and the processing speed of quickening electrical network of system.
Accompanying drawing explanation
Fig. 1 is the structural representation of secondary voltage drop/secondary load on-Line Monitor Device.
Marginal data: 1, microprocessor; 2, multichannel selected cell; 3, signal condition unit; 4, the first frequency multiplication unit; 5, AD conversion unit; 6, the second communication unit; 7, keyboard output unit; 71, button; 72, keyboard processor; 8, the first communication unit; 9, the second frequency multiplication unit.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited only to this.
[embodiment 1]
As shown in Figure 1, secondary voltage drop/secondary load on-Line Monitor Device of the present embodiment, comprise microprocessor 1, and being connected to signal condition unit 3, multichannel selected cell 2, the first frequency multiplication unit 4, AD conversion unit 5, the second communication unit 6, keyboard input block 7, the first communication unit 8, the second frequency multiplication unit 9 on microprocessor, above-mentioned multichannel selected cell 2, signal condition unit 3, the first frequency multiplication unit 4, AD conversion unit 5 are also connected successively.Wherein: the quantity of AD conversion unit 5 is 2; The second frequency multiplication unit 9 is digital frequency multiplier, and its quantity is 2, and each second frequency multiplication unit 9 connects in an AD conversion unit 5, for AD conversion unit 5 samplings provide benchmark sampled signal.Above-mentioned keyboard input block 7 comprises keyboard processor 72 and is connected to the button 71 on keyboard processor 72, and above-mentioned keyboard processor 72 is connected with microprocessor 1.Its working method is:
The three-phase alternating voltage Ua of tested electric energy meter, Ub, Uc and three-phase alternating current Ia, Ib, Ic access multichannel selected cell 2 and signal condition unit 3, the control command that microprocessor 1 is inputted by front end processor by the second communication unit 6 or keyboard processor special LPC932 judgement or the keyboard commands of inputting by keyboard input block 7, and according to control command or keyboard commands control signal conditioning unit 3 and multichannel selected cell 2, select two-way input signal and the two-way sampling reference signal with suitable range, input signal is sent into respectively to two AD conversion unit 5, the two-way reference signal of sampling is sent into respectively to two the second digital frequency multipliers in frequency multiplication unit 9, under the control of two-way sampling reference signal, it is analog to digital conversion that two AD conversion unit 5 are sampled to two input signals respectively, in transformation result microprocessor 1, carry out computing, complete voltage, the measurement of electric current etc., and calculate electric energy meter load, error, and the data that record in conjunction with measurement extension set complete the measurement of secondary voltage drop.In the present embodiment:
The first communication unit 8, for receiving the measurement data of measuring extension set, it can be wireless communication module, also can be wire communication module, wireless communication module can adopt GPS communication module, 2.5G communication module, 3G communication module etc., wire communication module can be RS485 communication module, ethernet communication module etc., in the present embodiment, adopt the GPRS wireless module of the GTM900B of Huawei model, in practical application, also can adopt the module of other types or other models to realize, measuring extension set even can adopt shielding line mode and secondary voltage drop/secondary load on-Line Monitor Device to carry out communication.
Multichannel selected cell 2, for selecting to access signal in State selective measurements loop, can be change-over switch or relay, in the present embodiment, adopt ADG608 eight path analoging switch and ADG333 multi-way switch chip to realize, ADG333 multi-way switch chip is for responding the conducting order that microprocessor sends a certain way switch, as switching over signal, select a certain road or multiple signals input wherein, ADG608 eight path analoging switch are used for accessing collection signal, it can access at most the signal that eight measuring circuits gather, but its selection according to ADG333 multi-way switch chip accesses corresponding signal.
The first frequency multiplication unit 4, carries out process of frequency multiplication for the signal to after conditioning, can adopt LC resonant circuit or full-wave rectifying circuit to realize, and due to these two kinds of circuit Ye Wei this area custom circuits in detail, its particular circuit configurations is no longer described in detail in the present embodiment; In the present embodiment, adopt FERRITE-220 chip and/or MPZ1608S221A chip to realize.
The second communication unit 6, be used for and front end processor communication, receive front end processor steering order and send test data to front end processor, in the present embodiment, the second communication unit 6 is serial communication unit, adopts MAX3232 transceiver or MAX232 transceiver to realize RS-232 performance: MAX3232 transceiver is realized double-loop T TL and turned 232 level; MAX232 realizes single loop TTL and turns 232 level; In practical application, can be also other; The interface of type, such as but not limited to USB.
The second frequency multiplication unit 9, for sampling reference signal is carried out to process of frequency multiplication, adopts the conventional digital frequency multiplier in this area in the present embodiment, repeat no more its concrete structure herein.
Secondary voltage drop/secondary load on-line monitoring system, comprising:
Voltage measuring transformer extension set, is connected to the secondary side circuit of voltage transformer (VT), for secondary load, secondary outgoing line voltage, loop current the calculating voltage transformer error of measuring voltage mutual inductor, and measurement data is sent to measurement main frame;
Current transformer is measured extension set, is connected to Current Transformer Secondary side loop, for measuring secondary load, loop current, the terminal voltage of current transformer and calculating the error of current transformer, and measurement data is sent to measurement main frame;
Measure main frame, measuring extension set with voltage measuring transformer extension set summation current transformer is all connected, and be connected to the three-phase secondary circuit of electric energy meter, for electric energy meter error measurement, electric energy meter side input voltage value and input current value measurement, secondary voltage drop, calculate, and result of calculation is sent to front end processor; Above-mentioned measurement main frame is the secondary voltage drop/secondary load on-Line Monitor Device in embodiment 1, above-mentioned current transformer is measured extension set and voltage measuring transformer extension set existing PT, the CT with communication function that can sample and is measured extension set, also can adopt secondary voltage drop/secondary load on-Line Monitor Device in the present invention as measuring extension set.
Front end processor, stores, shows, sends to remote monitoring center and send order to measuring main frame for this locality of measurement data.Above-mentioned front end processor comprises serial ports transceiver module, data analysis module, alarm analysis module, data memory module, communication module, in above-mentioned data memory module, database is installed.Above-mentioned communication module comprises at least one in both of wire communication module, wireless communication module, and above-mentioned wireless communication module is GPRS wireless module or 3G wireless module, and above-mentioned wire communication module is RS485 communication module or ethernet communication module.
Said system, to secondary voltage drop/secondary load on-line monitoring method, comprises the following steps:
(1) voltage transformer (VT) data acquisition step: voltage measuring transformer extension set gathers secondary load, the output voltage of secondary side output terminal, the loop current of voltage transformer (VT), calculating voltage transformer error, and the data of collection are sent to measurement main frame by wireless or wired mode; In this step, the total loop electric current access voltage measuring transformer extension set by the output voltage of voltage transformer secondary side output terminal and voltage transformer (VT), just can record the secondary load of voltage transformer (VT), and can calculate the error of voltage transformer (VT);
(2) current transformer data acquisition step: current transformer is measured secondary load, loop current, the terminal voltage that extension set gathers current transformer, calculates the error of current transformer, and the data of collection is sent to measurement main frame by wireless or wired mode; In this step, Current Transformer Secondary side loop electric current and secondary side voltage access current transformer are measured to extension set, just can record the secondary load of current transformer, and can calculate the error of current transformer;
(3) electric energy meter data acquisition step: measure input voltage value and the input current value of main frame multi collect electric energy meter in one-period, and calculate effective voltage value, watt current value, power, the electric energy meter error of electric energy meter input according to the data that gather; In this step, the input voltage of electric energy meter input side and input current access are measured to main frame, measure effective voltage value, watt current value, power, electric energy meter error equivalence that main frame just can calculate electric energy meter, and calculate secondary voltage drop according to the input voltage value of the output voltage of voltage transformer secondary side output terminal and electric energy meter.Wherein, the computing formula of effective voltage value Veff, watt current value Ieff, average power P is as follows:
Wherein, the cycle that T is voltage and current.If with the time interval of △ t voltage and current is sampled in one-period T N point simultaneously, i.e. T=N * △ t, above-mentioned three amounts can be expressed as:
Wherein u (k), i (k) are respectively the sampled value of k point u, i.Thereby microprocessor just can calculate Veff, Ieff and P according to the sampled value of u, i.
(4) measure main frame overall treatment step: measure main frame receiver voltage mutual inductor data summation current transformer data, calculating voltage transformer secondary voltage drop, and the voltage transformer (VT) data of collection, current transformer data, electric energy meter data and the computational data of measuring main frame are shown and send to front end processor;
(5) front end processor treatment step, this step comprises:
(51) data receiver: front end processor receives data by the second communication unit from measure main frame, and above-mentioned the second communication unit is serial ports;
(52) data analysis: filter incorrect data according to predefined data protocol type, and data are classified;
(53) alarm analysis: alert if built-in according to system or that user sets is analyzed data and whether surpassed alert if, if surpassed, starts alarm module.
(54) deposit database in, and send to remote monitoring center;
(55) data transmission front end processor is outputed to data to send to remote monitoring center by RS485 interface or Ethernet interface.
Wherein, in above-mentioned steps, step (1) ~ step (3) is order in no particular order.
Below be only the preferred embodiment of the present invention, protection scope of the present invention is also not only confined to above-described embodiment, and all technical schemes belonging under thinking of the present invention all belong to protection scope of the present invention.It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, should be considered as protection scope of the present invention.
Claims (10)
1. secondary voltage drop/secondary load on-Line Monitor Device, comprises the first communication unit (8), for receiving, measures the measurement data that extension set is sent to; Microprocessor (1), for the test data of sampled signal and the first communication unit (8) reception being carried out to the work of computing and Dui Ge unit, carry out integral body control, it is characterized in that, also comprise: multichannel selected cell (2), for selecting to need the access signal of measurement, and the access signal of selection is sent to signal condition unit (3); Signal condition unit (3), nurses one's health for the access signal that multichannel selected cell (2) is selected, and the signal after conditioning is sent to the first frequency multiplication unit (4); The first frequency multiplication unit (4), carries out process of frequency multiplication for the signal to after conditioning, and the signal after frequency multiplication is sent to AD conversion unit (5); AD conversion unit (5), for the signal after the first frequency multiplication unit (4) frequency multiplication is sampled, obtains sampled signal; The second communication unit (6), for receiving front end processor steering order and sending test data to front end processor; Keyboard input block (7), for inputting field control instruction to microprocessor (1).
2. secondary voltage drop/secondary load on-Line Monitor Device according to claim 1, it is characterized in that, also comprise that described the second frequency multiplication unit (9) is all connected with microprocessor (1), AD conversion unit (5) for sampling reference signal being carried out to the second frequency multiplication unit (9) of process of frequency multiplication.
3. secondary voltage drop/secondary load on-Line Monitor Device according to claim 2, is characterized in that, described the second frequency multiplication unit (9) is digital frequency multiplier, and its quantity is 2; Described AD conversion unit (5) quantity is also 2, and each digital frequency multiplier connects an AD conversion unit (5).
4. secondary voltage drop/secondary load on-Line Monitor Device according to claim 1, is characterized in that, described keyboard input block (7) comprises keyboard processor (72) and is connected to the button (71) on keyboard processor (72).
5. secondary voltage drop/secondary load on-line monitoring system, is characterized in that, comprising:
Voltage measuring transformer extension set, is connected to the secondary side circuit of voltage transformer (VT), for secondary load, secondary outgoing line voltage, loop current the calculating voltage transformer error of measuring voltage mutual inductor, and measurement data is sent to measurement main frame;
Current transformer is measured extension set, is connected to Current Transformer Secondary side loop, for measuring secondary load, loop current, the terminal voltage of current transformer and calculating the error of current transformer, and measurement data is sent to measurement main frame;
Measure main frame, measuring extension set with voltage measuring transformer extension set, current transformer is all connected, and be connected to the three-phase secondary circuit of electric energy meter, for electric energy meter error measurement, electric energy meter side input voltage value and input current value measurement, secondary voltage drop, calculate, and result of calculation is sent to front end processor; Described measurement main frame is arbitrary described secondary voltage drop/secondary load on-Line Monitor Device in claim 1 ~ 4;
Front end processor, stores, shows, sends to remote monitoring center and send order to measuring main frame for this locality of measurement data.
6. secondary voltage drop/secondary load on-line monitoring system according to claim 5, it is characterized in that, described front end processor comprises serial ports transceiver module, data analysis module, alarm analysis module, data memory module, communication module, in described data memory module, database is installed.
7. secondary voltage drop/secondary load on-line monitoring system according to claim 6, it is characterized in that, described communication module comprises at least one in both of wire communication module, wireless communication module, described wireless communication module is GPRS wireless module or 3G wireless module, and described wire communication module is RS485 communication module or ethernet communication module.
8. secondary voltage drop/secondary load on-line monitoring method, comprises voltage transformer (VT) data acquisition step, current transformer data acquisition step, electric energy meter data acquisition step, it is characterized in that, also comprises and measures main frame overall treatment step and front end processor treatment step; Described measurement main frame overall treatment step is specially: measure main frame receiver voltage mutual inductor data summation current transformer data, calculating voltage transformer secondary voltage drop, and the voltage transformer (VT) data of collection, current transformer data, electric energy meter data and the computational data of measuring main frame are shown and send to front end processor; Described front end processor treatment step is specially: front end processor receives data from measure main frame, deposits database in, and sends to remote monitoring center.
9. secondary voltage drop/secondary load on-line monitoring method according to claim 8, it is characterized in that, described voltage transformer (VT) data acquisition step is specially: voltage measuring transformer extension set gathers secondary load, the output voltage of secondary side output terminal, the loop current of voltage transformer (VT), calculating voltage transformer error, and the data of collection are sent to measurement main frame by wireless or wired mode;
Described current transformer data acquisition step is specially: current transformer is measured secondary load, loop current, the terminal voltage that extension set gathers current transformer, calculate the error of current transformer, and the data of collection are sent to measurement main frame by wireless or wired mode;
Described electric energy meter data acquisition step is specially: measure input voltage value and the input current value of main frame multi collect electric energy meter in one-period, and according to the data that gather, calculate effective voltage value, watt current value, power, the electric energy meter error of electric energy meter input;
Above-mentioned three steps are order in no particular order.
10. secondary voltage drop/secondary load on-line monitoring method according to claim 8 or claim 9, it is characterized in that, in above-mentioned front end processor treatment step, front end processor receives data by serial ports from measure main frame, and front end processor sends the data to remote monitoring center by RS485 interface or Ethernet interface; In this step, front end processor has also carried out data analysis and alarm analysis after receiving data, before depositing database in:
Data analysis: filter incorrect data according to predefined data protocol type, and data are classified;
Alarm analysis: alert if built-in according to system or that user sets is analyzed data and whether surpassed alert if, if surpassed, starts alarm module.
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| CN201402286Y (en) * | 2009-04-03 | 2010-02-10 | 江苏省电力公司苏州供电公司 | Voltage drop detecting device of secondary circuit of voltage transformer |
| CN102053237A (en) * | 2009-10-31 | 2011-05-11 | 郑州三足科技发展有限公司 | Remote on-line detection system of electric energy metering device |
| CN202339371U (en) * | 2011-11-09 | 2012-07-18 | 北京煜邦电力技术有限公司 | Potential transformer (PT) secondary circuit voltage drop real-time synchronous measuring device |
| CN102944810A (en) * | 2012-12-12 | 2013-02-27 | 湖南省电力公司科学研究院 | Test device for secondary circuit zero line site of voltage transformer |
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| CN108459294A (en) * | 2017-02-20 | 2018-08-28 | 武汉市欧睿科技有限公司 | Mutual inductor secondary load on-line testing method |
| CN107153133A (en) * | 2017-04-24 | 2017-09-12 | 祝曙光 | Secondary voltage drop/load on-line monitoring system |
| CN110275061A (en) * | 2019-07-02 | 2019-09-24 | 京信通信系统（中国）有限公司 | A kind of power detector and its control method, device, equipment, medium |
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