CN203433105U - Virtual load error detector for secondary electric-energy metering system of intelligent transformer station - Google Patents
Virtual load error detector for secondary electric-energy metering system of intelligent transformer station Download PDFInfo
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- CN203433105U CN203433105U CN201320566106.9U CN201320566106U CN203433105U CN 203433105 U CN203433105 U CN 203433105U CN 201320566106 U CN201320566106 U CN 201320566106U CN 203433105 U CN203433105 U CN 203433105U
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Abstract
The utility model discloses a virtual load error detector for a secondary electric-energy metering system of an intelligent transformer station. The detector comprises an in-situ electric energy meter verifying instrument and a high-precision analog signal source, a three-phase voltage output by the high-precision analog signal source and an analog current are simultaneously input into the detected secondary electric-energy metering system of the intelligent transformer station and the in-situ electric energy meter verifying instrument, an electric energy pulse of a digital electric energy meter in the secondary electric-energy metering system is also input into the in-situ electric energy meter verifying instrument, and the electric energy of the secondary electric-energy metering system is compared with that of the in-situ electric energy meter verifying instrument, thereby comprehensively detecting the virtual load of the secondary electric-energy metering system of the intelligent transformer station. According to the utility model, the difficulty in comprehensively detecting the virtual load of the secondary electric-energy metering system of the intelligent transformer station is overcome, and the detector is easy to use, and highly economical, reliable and safe.
Description
Technical field
Electric power meter calibration technology field, particularly a kind of intelligent substation electric energy metrical electrical secondary system virtual load error detecting apparatus when the utility model relates to the debugging of intelligent substation in intelligent grid.
Background technology
Contradiction between the exhaustion of traditional energy and mankind's high speed development are growing to electricity needs is more and more outstanding, and for solving energy crisis problem, intelligent grid becomes national governments, power department and scientific research institution's primary study object.The concept of intelligent grid is formed with a process in the world, because the development level of various countries' electrical network is different with state, therefore, the electrical network target that one of various countries' construction meets future development demand is just different, starting point is also different, and driving factors are also different, and thinking of development is also different.Computer, electronic equipment and controlled electric power components and parts etc. that the U.S. proposes to take high performance-price ratio are basis, utilize the network communications technology, automatically control and infotech, by these technology and original defeated, power distribution infrastructure height in conjunction with and the novel power grid of formation.Europe propose by electric power with communicate by letter and computer control links together, to obtain the enormous benefits at aspects such as power supply reliability, transmission capacity and customer services.And China State Grid Corporation of China has formed the strategic development thinking framework of the strong intelligent grid of distinct Chinese characteristics of " target, two main lines, three phases, four systems, five intensions ".
The development of intelligent grid be unable to do without the construction of intelligent substation, and the research and development of intelligent substation correlation technique, has obtained the concern of numerous power consumers, scientific research, design, manufacturing sector.The development of China's intelligent grid marches at the forefront of the world, and existing many intelligent substations are established.Now, there is fundamental change in the electric energy metrical pattern of transformer station, also there is the variation of matter in the formation of electric energy metrical electrical secondary system and working method: the electric energy metered system in traditional transformer station consists of electromagnetic type current/voltage mutual inductor (outputting analog signal), electric energy meter and stube cable, and the electric energy metrical electrical secondary system of traditional transformer station mainly consists of conventional current/voltage transformer secondary cable, analog signal interface electric energy meter; And in intelligent substation, electric energy metrical electrical secondary system is mainly comprised of the merge cells with analog to digital converter, optical fiber and digital electric energy meter.
The structure and composition of intelligent substation electric energy metrical electrical secondary system has all had a great difference with traditional transformer station, and the accuracy of whole electric energy metrical electrical secondary system has a significant impact electric weight tool simultaneously; Moreover traditional transformer station electric energy metrical electrical secondary system can judge whether its class of accuracy meets rules and stipulate by the secondary load of measuring voltage transformer secondary voltage drop and whole secondary circuit, to guarantee the justice, just of electric energy metrical.But, the structure of intelligent substation electric energy metrical electrical secondary system is different from traditional transformer station with working mechanism, the error detection method of tradition transformer station electric energy metrical electrical secondary system is not in the error-detecting that is applicable to intelligent substation electric energy metrical electrical secondary system, particularly intelligent substation electric energy metrical electrical secondary system has been introduced the merge cells with analog to digital converter, voltage, current analog signal are converted into digital signal afterwards offering electric energy metrical use, in transfer process, unavoidably the precision of electric energy metrical signal are exerted an influence.At present, by consulting domestic and foreign literature, also there is no to find the report about intelligent substation electric energy metrical electrical secondary system global error context of detection.
Summary of the invention
Technical problem to be solved in the utility model is, not enough for prior art, provide a kind of intelligent substation electric energy metrical electrical secondary system virtual load error detecting apparatus, to meet the requirement of the whole virtual load error-detecting of intelligent substation field electric energy measurement electrical secondary system.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of intelligent substation electric energy metrical electrical secondary system virtual load error detecting apparatus, comprise electric energy meter on-site calibrator and high-precision analog signal source, between described electric energy meter on-site calibrator access in parallel intelligent substation electric energy metrical electrical secondary system current transformer and tested electric current merge cells; Described electric energy meter on-site calibrator, high-precision analog signal source output terminal be in parallel access between intelligent substation electric energy metrical electrical secondary system voltage transformer (VT) and tested voltage merge cells all, and described electric energy meter on-site calibrator is connected with the digital electric energy meter of intelligent substation electric energy metrical electrical secondary system; Described electric energy meter on-site calibrator output terminal is connected with host computer; Described high-precision analog signal source output terminal is connected with described electric energy meter on-site calibrator.
The method that the utility model detects intelligent substation electric energy metrical electrical secondary system virtual load error is: the three-phase voltage analog quantity of high-precision analog signal source output is transferred to the voltage digital signal that voltage merge cells converts FT3 form to, the voltage digital signal of FT3 form through Optical Fiber Transmission to electric current merge cells, the three-phase current analog quantity of high-precision analog signal source output is simultaneously converted to current digital signal by electric current merge cells, the voltage digital signal of FT3 form and current digital signal are packaged into the digital signal of IEC61850-9-2 message format by electric current merge cells, and be transferred to digital electric energy meter by the intelligent substation electric energy metrical electrical secondary system network switch, digital electric energy meter calculates the electric flux in virtual load situation
, and by photoelectric commutator, electrical energy pulse is transferred to electric energy meter on-site calibrator, the three-phase voltage analog quantity of high-precision analog signal source output and three-phase current analog quantity access electric energy meter on-site calibrator carry out energy calculate, draw the energy value of virtual load, i.e. standard energy value
, electric energy meter on-site calibrator pair
with
compare, calculate error in dipping under electric energy metrical electrical secondary system virtual load, complete the whole detection under intelligent substation electric energy metrical electrical secondary system virtual load.
Error under electric energy metrical electrical secondary system virtual load
computing formula is:
Wherein,
,
nfor umber of pulse,
cfor digital electric energy meter constant
Compared with prior art, the beneficial effect that the utility model has is: apparatus structure of the present utility model is simple, reliable; Use device of the present utility model, verification personnel can carry out virtual load error-detecting without any electrical contact in the situation that with a high tension loop; Solved the difficult problem that intelligent substation electric energy metrical electrical secondary system cannot be carried out whole detection and verification, and device of the present utility model is simple, has higher economy, reliability, security and high efficiency.
Accompanying drawing explanation
Fig. 1 is the utility model virtual load pick-up unit and electric energy metrical electrical secondary system connection diagram.
Embodiment
As shown in Figure 1, high-precision analog signal source (model: DK-56C2) simultaneously export three-phase voltage analog quantity
u a,
u b,
u cwith three-phase current analog quantity
i a,
i b,
i cprocess wire accesses respectively conventional voltage transformer secondary circuit and conventional current transformer secondary circuit sky is opened tested voltage merge cells and electric current merge cells afterwards, consider security factor, prevent that voltage, Current Transformer Secondary are to counter boosting and up-flow once, voltage transformer (VT) summation current transformer secondary circuit sky leaves and must disconnect.Meanwhile,
u a,
u b,
u cwith
i a,
i b,
i calso input electric energy meter on-site calibrator, and calculate the energy value of virtual load, i.e. standard energy value
.Three-phase voltage analog quantity
u a,
u b,
u cbe input to the tested voltage merge cells with analog to digital converter, be converted into the digital message of FT3 form, through Optical Fiber Transmission to the tested electric current merge cells with analog to digital converter.Three-phase current analog quantity
i a,
i b,
i cbe input to the tested electric current merge cells with analog to digital converter, tested electric current merge cells converts IEC61850-9-2 form message to the voltage signal of FT3 form and digital current signal, and be transmitted through the fiber to the network switch, by the network switch, by optical fiber, three-phase voltage, current signal are sent to digital electric energy meter again, by digital electric energy meter, calculate the electric flux in virtual load situation
.The energy value of digital electricity meter metering
the error that not only can reflect tested voltage merge cells and electric current merge cells, can also reflect the error in dipping of digital electricity meter itself, and therefore, the method the utility model proposes can detect the global error of electric energy metering secondary.The output pulse of digital electric energy meter is sent to electric energy meter on-site calibrator, and by electric energy meter on-site calibrator handle
with
compare, calculate meritorious, the error of reactive power metering under electric energy metering secondary virtual load, complete the whole detection under intelligent substation electric energy metering secondary virtual load.Error calculation formula is:
（2）
(2) formula is brought in (1), draws:
（3）
In formula (3), N is umber of pulse, and C is digital electric energy meter constant.
Master system software is housed in host computer, master system software is comprised of five functional module, respectively: real time data module, historical data module, system and parameter arrange module, meritorious accuracy test module, idle accuracy test module, and each functional module all can carry out freely switching and printing.The setting of the function such as verification passage, meter constant and umber of pulse, tested electric energy metering secondary essential information when parameter arranges module and can realize meritorious, idle precision checking.Real time data module can realize representing of meritorious, idle accuracy test real-time waveform and data.Qualified and the number of non-compliances certificate that verification personnel deposit in the time of also can checking verification in the past by historical data module, is convenient to analyze and search reason.Main help module in virtual load test key frame has explanation that how system software to operate and the introduction of each functions of modules feature, can facilitate experiment operator to consult at any time.Master system software can also carry out login username and security password is set, to guarantee that experiment arranges and the safety of experimental data.
Claims (1)
1. an intelligent substation electric energy metrical electrical secondary system virtual load error detecting apparatus, it is characterized in that, comprise electric energy meter on-site calibrator and high-precision analog signal source, between described electric energy meter on-site calibrator access in parallel intelligent substation electric energy metrical electrical secondary system current transformer and tested electric current merge cells; Described electric energy meter on-site calibrator, high-precision analog signal source output terminal be in parallel access between intelligent substation electric energy metrical electrical secondary system voltage transformer (VT) and tested voltage merge cells all, and described electric energy meter on-site calibrator is connected with the digital electric energy meter of intelligent substation electric energy metrical electrical secondary system; Described electric energy meter on-site calibrator output terminal is connected with host computer; Described high-precision analog signal source output terminal is connected with described electric energy meter on-site calibrator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320566106.9U CN203433105U (en) | 2013-09-12 | 2013-09-12 | Virtual load error detector for secondary electric-energy metering system of intelligent transformer station |
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|---|---|---|---|
| CN201320566106.9U CN203433105U (en) | 2013-09-12 | 2013-09-12 | Virtual load error detector for secondary electric-energy metering system of intelligent transformer station |
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|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472433A (en) * | 2013-09-12 | 2013-12-25 | 国家电网公司 | Intelligent substation electric energy measuring secondary system virtual load error detection device and method |
| CN105866576A (en) * | 2016-04-01 | 2016-08-17 | 国家电网公司 | Simulation detection system of intelligent transformer station secondary-side electric energy metering error influence, and detection analysis method |
| CN110764045A (en) * | 2019-11-26 | 2020-02-07 | 国网四川省电力公司电力科学研究院 | Verification system and verification method for digital metering of intelligent substation |
-
2013
- 2013-09-12 CN CN201320566106.9U patent/CN203433105U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472433A (en) * | 2013-09-12 | 2013-12-25 | 国家电网公司 | Intelligent substation electric energy measuring secondary system virtual load error detection device and method |
| CN105866576A (en) * | 2016-04-01 | 2016-08-17 | 国家电网公司 | Simulation detection system of intelligent transformer station secondary-side electric energy metering error influence, and detection analysis method |
| CN110764045A (en) * | 2019-11-26 | 2020-02-07 | 国网四川省电力公司电力科学研究院 | Verification system and verification method for digital metering of intelligent substation |
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