CN202075405U - Onsite overall detection system of three-phase electric energy metering system of distribution network - Google Patents

Onsite overall detection system of three-phase electric energy metering system of distribution network Download PDF

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CN202075405U
CN202075405U CN2011201213736U CN201120121373U CN202075405U CN 202075405 U CN202075405 U CN 202075405U CN 2011201213736 U CN2011201213736 U CN 2011201213736U CN 201120121373 U CN201120121373 U CN 201120121373U CN 202075405 U CN202075405 U CN 202075405U
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phase
electric energy
standard
energy meter
line
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CN2011201213736U
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江波
杨华云
蒋卫
蒋映霞
何娜
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四川电力科学研究院
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Abstract

An onsite overall detection system of a three-phase electric energy metering system of a distribution network is mainly composed of portable adjustable three-phase voltage, a watt-hour meter calibrator, an onsite metering circuit of a three-phase watt-hour meter and a standard metering circuit of the three-phase watt-hour meter. According to a V-V connection method or a Y-Y connection method, a primary return circuit of a high-voltage current transformer of the onsite metering circuit is in series connection with a standard high-voltage current transformer, and a voltage transformer return circuit of the onsite metering circuit is in parallel connection with a standard voltage transformer. The onsite overall detection system enables the comprehensive error to reach minimum, improves the accuracy of metering devices through the overall inspection, and can detect the overall operation performance of an electric energy metering system of a three-phase power-supply system of the distribution network directly, authentically and accurately.

Description

Power distribution network three-phase electric energy metering system for field whole detection system

Technical field

The utility model relates to a kind of detection calibrating installation of electric energy meter, particularly relate to power distribution network three-phase electric energy metering device runnability detection system, be specifically designed to the on-the-spot overall operation Performance Detection of power distribution network three-phase power supply system electric power meter, be particularly useful for the whole verification (calibrating) of the electric power meter of high-voltage three-phase combination transformer formation.

Background technology

In the power distribution network of 3kV~35kV, the electric energy metrical of three-phase power supply system and the installation of measuring apparatus are to adopt phase three-wire three (V-V) mode of connection basically, and this all is used widely in urban distribution network and rural power grids.That is to say, the electric energy metrical of this system carries out under phase three-wire three (V-V wiring) metering method, therefore also should under this mode, carry out just meeting their practical operation situation for measurement verification or verification, the accuracy of verification like this (calibrating) and fairness could farthest obtain embodying, and can obtain users' approval, this also is that good service is carried out in electric system, technological means and the measure that should make for social harmony.But the verification of the electric power meter of present domestic three-phase power supply system (calibrating) mode but is not as mentioned above according to carrying out whole verification under the phase three-wire three metering method.

Fig. 1 dotted line left part is the theory diagram of the electric energy metrical that adopts of on-the-spot three-phase power supply system, is that each measuring element is carried out verification (calibrating) separately at present to the detection of as shown in Figure 1 measuring apparatus, calculates the error performance of whole metering system then.This detection method can't simulated field actual motion conditions and environment be carried out Performance Detection, particularly still adopt single plane method to carry out verification to the verification of threephase potential transformer in the three-phase combination transformer (TV) and threephase current transformer (TA), can't detect between threephase potential transformer in the three-phase combination transformer (TV) and the threephase current transformer (TA) electric field and magnetic field influences each other and mutual inductor with the actual motion performance under the actual load.Equally, electric energy meter also is to carry out Performance Detection separately.

The power consumption that the three-phase power supply system electric energy metrical is embodied on the trade settlement is represented and is manifested by the electric energy meter in last ring in this system, though relevant national standard has been stipulated the class of accuracy of individual device in the metering system, but their error be in certain class of accuracy can or plus or minus ground deviation, the simple example of lifting, error as TV is+0.1%, the TA error is+0.1%, electric energy meter error also is+0.1%, though this moment, electric energy meter error did not surpass 0.2%, but the actual error of this metering system has been 0.3% theoretically, surpass the actual power table and detected error, also surpassed 0.2 grade of electric energy meter nameplate institute nominal.So when the periodic calibration of metering system or metering arbitration, the accuracy of a whole set of metering system only is described according to the error of electric energy meter, can not allow the people convince, and the mode and the conclusion of calibrating like this and do not meet the practical operation situation of this metering system.

Therefore, in today of social development and technical progress, existing relevant regulations and measurement and examination method should grow with each passing hour, to adapt to and to satisfy the requirement of society.How exactly high voltage distribution network three-phase electric energy metering device being carried out measurement verification, thereby guarantee confession, electricity consumption both sides' economic interests fair and justly, is the starting point and the starting point of this patent.

The utility model content

The purpose of this utility model provides that a kind of global error is little, measurement verification power distribution network three-phase electric energy metering system for field whole detection system accurately and conveniently.

This novel purpose is achieved in that a kind of power distribution network three-phase electric energy metering system for field whole detection system, comprises that test of kilo watthour meter instrument, portable adjustable three-phase supply: voltage is 3kV~35kV, electric current 0~600A; Also have,

Threephase potential transformer TV: an end of each elementary winding is connected with a phase line of described three-phase supply in its three elementary windings, the other end of these three elementary windings interconnects, one of each a secondary winding end that is terminated at the potential winding of a single-phase monoenergetic table in the three-phase and four-line active electric energy meter in its three secondary winding, the other end of the potential winding of each single-phase electric energy meter all is connected with the zero line of three-phase supply, and the other end of these three secondary winding all is connected with the zero line of three-phase supply;

Threephase current transformer TA: each coil is arranged on the phase line of (being that snare exists) three-phase supply in its three coils, and each coil in these three coils is connected in series with the current coil of a single-phase electric energy meter in the three-phase and four-line active electric energy meter;

Standard threephase potential transformer STV: an end of each elementary winding is connected with a phase line of three-phase supply in its three elementary windings, the other end of these three elementary windings interconnects, one of each a secondary winding end that is terminated at the potential winding of a standard single-phase electric energy meter in the standard three-phase and four-line active electric energy meter in its three secondary winding, the other end of the potential winding of each standard single-phase electric energy meter all is connected with the zero line of three-phase supply, and the other end of these three secondary coils all is connected with the zero line of three-phase supply;

Standard threephase current transformer STA: each coil is arranged on the phase line of three-phase supply in its three coils, and each coil in these three coils is connected in series with the current coil of a standard single-phase electric energy meter in the standard three-phase and four-line active electric energy meter;

Above-mentioned three-phase and four-line active electric energy meter and the signal output part of standard three-phase and four-line active electric energy meter are connected the signal input part of described electrical energy meter calibration instrument respectively.

The accuracy of above-mentioned standard threephase potential transformer STV is than high 2~3 grades of the accuracy of threephase potential transformer TV; The accuracy of standard threephase current transformer STA is than high 2~3 grades of the accuracy of threephase current transformer TA; The accuracy of the single-phase four line active electric energy meters of standard is than high 2~3 grades of the accuracy of three-phase and four-line active electric energy meter.

The utility model has been set up the on-the-spot overall operation method for testing performance of a cover power distribution network three-phase power supply system electric power meter, specifically be to have made up a cover and the on all four electric energy metered system standard of field electric energy measurement system architecture, under the drive of same set of high pressure three-phase voltage source and current source, the electric flux that two cover systems are accumulated under identical service condition compares simultaneously, draws the overall operation performance of power distribution network three-phase power supply system electric power meter.So, the on-the-spot actual motion state of analog ligand electrical network three-phase power supply system electric power meter, and carry out the runnability whole detection at this state, and therefore, this novel being only to the most real verification of this metering system (calibrating).

This method is the connection of utilization and actual motion systems compliant, when having overcome the measurement verification verification, sub-unit error stack and can not the shortcoming of real embodiment on final metering electric energy meter, can obtain the actual error value of metering system under various load currents, on this basis, and then have at ground each metering unit in the system is made up pairing, reached the minimum of global error, just realized the accuracy and the fairness of metering.

The beneficial effects of the utility model are:

1, made up a cover and constituted the on all four power distribution network three-phase power supply system of structure electric energy metered system standard with power distribution network three-phase power supply system electric power meter, its class of accuracy is than high 2 to 3 class of accuracies of overall accuracy grade of the power distribution network three-phase power supply system electric power meter of on-the-spot operation.

2, set up the high-tension current inductor standard, adopted all insulation structure, can bear 3~35kV electric pressure, and the high pressure leakage current is not more than 1/10 of current transformer standard error limit value to the error effect amount that current transformer produces.

3, the portable three-phase supply that can use when having a power failure can produce high pressure three-phase current and three-phase voltage not needing the outside to provide under the situation of ac test power supply, insert power distribution network three-phase power supply system electric energy metered system standard (by standard threephase potential transformer (standard TV), standard threephase current transformer (standard TA) and standard electric energy meter are formed) and on-the-spot power distribution network three-phase power supply system electric energy metered system, the two is all moved under simulation actual motion condition, the parameters such as electric weight of following two metering systems accumulative total of same high pressure driving source are imported the electrical energy meter calibration instrument simultaneously and are carried out verification (calibrating), thereby obtain the overall operation performance of real on-the-spot power distribution network three-phase power supply system electric energy metered system.

4, since modular system and real system all compare synchronously, and all by same the portable three-phase supply power supply that can when having a power failure, use, this can simulate the current capacity of 1% to 120% rated current easily, thereby accurately detects the actual motion performance of this power distribution network three-phase power supply system electric energy metered system under different running statuses.

5, this method is not only carried out whole verification (calibrating) to on-the-spot power distribution network three-phase power supply system electric power meter, also can examine and determine three-phase combination transformer and electric energy meter separately respectively, and make up pairing according to the independent error of individual device, thereby the global error that reaches power distribution network three-phase power supply system electric energy metered system is minimum purpose.

6, owing to be the overall operation performance that directly detects power distribution network three-phase power supply system electric energy metered system, therefore, can in time find the stealing electricity phenomenon of electric energy metered system, simultaneously metering system once with secondary circuit in any mode of connection that is not inconsistent regulation can be easily, come into plain view by on-the-spot the detection immediately.

Description of drawings

Fig. 1 is this novel functional-block diagram.

Fig. 2 is this novel whole verification wiring diagram (V-V type connection).

Fig. 3 is this novel whole verification wiring diagram (Y-Y type connection).

Embodiment

Among Fig. 1: U, be the high voltage of three-phase supply output; I, be the electric current of three-phase supply output; TV, voltage transformer (VT); TA, current transformer.The dotted line left side is the field electric energy measurement device among Fig. 1, and dotted line the right is the standard electric power meter consistent with the field electric energy measurement apparatus structure.

Among Fig. 2: TV, voltage transformer (VT); TA, current transformer; STV, standard potential transformer; STA, standard current transformer.

Power supply: (according to field device parameters, voltage can be 3kV~35kV to the three-phase high-voltage power supply; Current source part exportable 0~600A).

Phase three-wire three active electric energy meter (being watt-hour meter): the scene is used for the electric energy meter of trade settlement.

This wiring diagram is the phase three-wire three metering method, V-V type connection.Among Fig. 2, top, the left side is the phase three-wire three active electric energy meter, and top, the right side is a standard electric energy meter.Fig. 3 is like this equally.

Among Fig. 3: TV, voltage transformer (VT); TA, current transformer; STV, standard potential transformer; STA, standard current transformer.

Power supply: (according to field device parameters, voltage can be 3kV~35kV to the three-phase high-voltage power supply; Current source part exportable 0~600A).

The three-phase and four-line active electric energy meter: the scene is used for the electric energy meter of trade settlement.

This wiring diagram is the three-phase and four-line metering method, Y-Y type connection, and the dotted line left side is the field electric energy measurement device among the figure, dotted line the right is the standard electric power meter consistent with the field electric energy measurement apparatus structure.

Below in conjunction with accompanying drawing the utility model is further described.

Referring to Fig. 3, this novel test of kilo watthour meter instrument, portable adjustable three-phase supply of comprising: voltage is 3kV~35kV, electric current 0~600A; Also have,

Threephase potential transformer TV: an end of each elementary winding is connected with a phase line of described three-phase supply in its three elementary windings, the other end of these three elementary windings interconnects, one of each a secondary winding end that is terminated at the potential winding of a single-phase monoenergetic table in the three-phase and four-line active electric energy meter in its three secondary winding, the other end of the potential winding of each single-phase electric energy meter all is connected with the zero line of three-phase supply, and the other end of these three secondary winding all is connected with the zero line of three-phase supply;

Threephase current transformer TA: each coil is arranged on the phase line of (being that snare exists) three-phase supply in its three coils, and each coil in these three coils is connected in series with the current coil of a single-phase electric energy meter in the three-phase and four-line active electric energy meter;

Standard threephase potential transformer STV: an end of each elementary winding is connected with a phase line of three-phase supply in its three elementary windings, the other end of these three elementary windings interconnects, one of each a secondary winding end that is terminated at the potential winding of a standard single-phase electric energy meter in the standard three-phase and four-line active electric energy meter in its three secondary winding, the other end of the potential winding of each standard single-phase electric energy meter all is connected with the zero line of three-phase supply, and the other end of these three secondary coils all is connected with the zero line of three-phase supply;

Standard threephase current transformer STA: each coil is arranged on the phase line of three-phase supply in its three coils, and each coil in these three coils is connected in series with the current coil of a standard single-phase electric energy meter in the standard three-phase and four-line active electric energy meter;

Above-mentioned three-phase and four-line active electric energy meter and the signal output part of standard three-phase and four-line active electric energy meter are connected the signal input part of described electrical energy meter calibration instrument respectively.

Referring to Fig. 2 and Fig. 3, after this distribution line has a power failure, insert the portable three-phase supply that can use when having a power failure in addition, the high-tension current inductor primary circuit of metering system is connected in series the high-tension current inductor standard at the scene, and is by the actual three-phase mode of connection (as V-V connection or Y-Y connection); The voltage transformer circuit of metering system at the scene, and connect the high voltage potential transformer standard, equally by the actual three-phase mode of connection (as V-V connection or Y-Y connection); The standard mutual inductor that is used for verification (calibrating) like this inserts by the three-phase mode of connection of system's operation fully, has constituted the power distribution network three-phase power supply system electric energy metered system standard with on-the-spot three-phase distribution network metering systems compliant.By regulating the portable three-phase supply that can when having a power failure, use, by verification (calibrating) requirements of one's work input predetermined electric current and rated voltage, the electric current of mutual inductor secondary output and voltage enter respectively and respectively carry the electric energy meter that carries, carrying out verification (calibrating) in the signal input electrical energy meter calibration instrument of scene installation electric energy meter and standard electric energy meter.Because the accuracy of this standard set-up (containing standard electric energy meter, standard potential transformer, standard current transformer) is than high 2 to 3 class of accuracies of on-the-spot operation electric power meter, like this, the error of electric energy metered system standard can be ignored, and the error amount of two cover systems that draw by the electrical energy meter calibration instrument promptly is the global error of situ metrology system.

The two cover key equipments that this is novel, the one, the portable three-phase supply that can when having a power failure, use that can under power-off condition, use, it can produce the alternating current of 0~600A, and voltage source produces the high voltage of 3kV~35kV, and the scene of being applicable to is in the verification (calibrating) under the power-off condition.Power supply is light simultaneously, carries easily and installs.Second complete equipment is exactly to need development three-phase standard current transformer consistent with on-the-spot operational outfit and standard potential transformer and the two all need move under high voltage.Its typical three-phase three-way (V-V) wiring as shown in Figure 2.As seen from Figure 2, whole verification combines the error of each measuring element of measuring apparatus, and TV secondary voltage drop error, also having the interactional error of bringing of electric field and magnetic field of the inner adjacent elements of three-phase combination transformer etc., the error that the actual metered device is produced is in the comparison of electric energy meter, unified manifesting, this method is to the calibrating verification of error in dipping, and is more direct, truer, more reasonable, so whole verification just has practical significance.

What Fig. 2 enumerated is phase three-wire three (V-V) mode of connection, and same, the three-phase and four-line cited to Fig. 3 (Y-Y) mode of connection also can be implemented whole verification (calibrating).In order farthest to improve the detection accuracy of measuring apparatus, on the basis of above-mentioned whole verification, can carry out independent verification to each parts respectively again, in the accuracy range of every equipment regulation, reasonably arrange in pairs or groups, make its composition error reach minimum, thus the accuracy that improves measuring apparatus by the result of whole verification, and this is very necessary to the electric energy metrical as trade settlement.

In addition, verification (calibrating) to the situ metrology device, except individually at each metering outfit in the device, first and second mode of connection of total system, mounting process quality, long-time running maintenance levelss etc. are all influential to the accuracy of check, the sub-unit checking method of now always continuing to use can't be found these problems, and whole method of calibration has overcome these drawbacks, can find the problems referred to above, and the error-detecting result accurately who obtains.Particularly when measurement loop once with secondary in when the behavior of stealing is arranged, can in time be found.

Referring to Fig. 2 and Fig. 3, being the on-the-spot overall operation method for testing performance of power distribution network three-phase power supply system electric power meter based on the utility model is made up of situ metrology device, STANDARD MEASURING APPARATUS FOR and three parts of portable three-phase supply that can use when having a power failure.By same set of current source and the voltage source power supply of doing experiment, the TV of tested device and the TV of standard set-up are and are connected in parallel, the TA of tested device and the TA of standard set-up are and are connected in series, two covering devices are accepted electric current and the voltage from portable three-phase supply supply synchronously, to tested device, its secondary circuit and the mode of connection thereof are not done any change, keep and the actual motion state consistency, standard set-up and equipment thereof are then stipulated according to rules, standard potential transformer, the accuracy of current transformer and standard electric energy meter all is higher than two to three class of accuracy levels of tested device relevant device, supply with under arbitrary checkpoint electric current and the rated voltage at regulated power supply, the information of the reflection of tested electric energy meter delivered to go verification (calibrating) in the standard electric energy meter tester, because the class of accuracy high two of standard set-up is to Three Estate, its error can be ignored like this, so the data that obtain in the tester promptly are the global errors of tested device.

Claims (2)

1. a power distribution network three-phase electric energy metering system for field whole detection system comprises that test of kilo watthour meter instrument, portable adjustable three-phase supply: voltage is 3kV~35kV, electric current 0~600A; It is characterized in that: also have,
Threephase potential transformer TV: an end of each elementary winding is connected with a phase line of described three-phase supply in its three elementary windings, the other end of these three elementary windings interconnects, one of each a secondary winding end that is terminated at the potential winding of a single-phase monoenergetic table in the three-phase and four-line active electric energy meter in its three secondary winding, the other end of the potential winding of each single-phase electric energy meter all is connected with the zero line of three-phase supply, and the other end of these three secondary winding all is connected with the zero line of three-phase supply;
Threephase current transformer TA: each coil is arranged on the phase line of three-phase supply in its three coils, and each coil in these three coils is connected in series with the current coil of a single-phase electric energy meter in the three-phase and four-line active electric energy meter;
Standard threephase potential transformer STV: an end of each elementary winding is connected with a phase line of three-phase supply in its three elementary windings, the other end of these three elementary windings interconnects, one of each a secondary winding end that is terminated at the potential winding of a standard single-phase electric energy meter in the standard three-phase and four-line active electric energy meter in its three secondary winding, the other end of the potential winding of each standard single-phase electric energy meter all is connected with the zero line of three-phase supply, and the other end of these three secondary coils all is connected with the zero line of three-phase supply;
Standard threephase current transformer STA: each coil is arranged on the phase line of three-phase supply in its three coils, and each coil in these three coils is connected in series with the current coil of a standard single-phase electric energy meter in the standard three-phase and four-line active electric energy meter;
Above-mentioned three-phase and four-line active electric energy meter and the signal output part of standard three-phase and four-line active electric energy meter are connected the signal input part of described electrical energy meter calibration instrument respectively.
2. power distribution network three-phase electric energy metering system for field whole detection according to claim 1 system, it is characterized in that: the accuracy of described standard threephase potential transformer STV is than high 2~3 grades of the accuracy of threephase potential transformer TV; The accuracy of standard threephase current transformer STA is than high 2~3 grades of the accuracy of threephase current transformer TA; The accuracy of the single-phase four line active electric energy meters of standard is than high 2~3 grades of the accuracy of three-phase and four-line active electric energy meter.
CN2011201213736U 2011-04-22 2011-04-22 Onsite overall detection system of three-phase electric energy metering system of distribution network CN202075405U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102156274A (en) * 2011-04-22 2011-08-17 四川电力科学研究院 Field integral detecting system of three-phase electric energy measuring system of electric distribution network
CN103149547A (en) * 2012-12-23 2013-06-12 北京智网创能科技有限公司 Transformer substation measurement return circuit online monitoring system and state maintenance method
CN103792508A (en) * 2014-01-27 2014-05-14 国家电网公司 Error test system and method for digitized metering device
CN105911512A (en) * 2016-06-06 2016-08-31 国家电网公司 Intelligent electric energy meter constant test system and test method thereof
RU2635833C2 (en) * 2012-06-12 2017-11-16 Машиненфабрик Райнхаузен Гмбх Device for calibration of power measurement system for power transformers

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102156274A (en) * 2011-04-22 2011-08-17 四川电力科学研究院 Field integral detecting system of three-phase electric energy measuring system of electric distribution network
CN102156274B (en) * 2011-04-22 2012-10-03 四川电力科学研究院 Field integral detecting system of three-phase electric energy measuring system of electric distribution network
RU2635833C2 (en) * 2012-06-12 2017-11-16 Машиненфабрик Райнхаузен Гмбх Device for calibration of power measurement system for power transformers
CN103149547A (en) * 2012-12-23 2013-06-12 北京智网创能科技有限公司 Transformer substation measurement return circuit online monitoring system and state maintenance method
CN103149547B (en) * 2012-12-23 2016-04-27 北京智网创能科技有限公司 Transformer substation measurement return circuit on-line monitoring system and state maintenance method
CN103792508A (en) * 2014-01-27 2014-05-14 国家电网公司 Error test system and method for digitized metering device
CN103792508B (en) * 2014-01-27 2016-04-06 国家电网公司 The error testing system of the digitized measurement device and method of testing
CN105911512A (en) * 2016-06-06 2016-08-31 国家电网公司 Intelligent electric energy meter constant test system and test method thereof

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