CN106291089B - A kind of intelligent electric energy meter falls zero curve detection method - Google Patents
A kind of intelligent electric energy meter falls zero curve detection method Download PDFInfo
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- CN106291089B CN106291089B CN201610595731.4A CN201610595731A CN106291089B CN 106291089 B CN106291089 B CN 106291089B CN 201610595731 A CN201610595731 A CN 201610595731A CN 106291089 B CN106291089 B CN 106291089B
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- zero curve
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
- G01R22/068—Arrangements for indicating or signaling faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
- G01R22/066—Arrangements for avoiding or indicating fraudulent use
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention discloses a kind of intelligent electric energy meters to fall zero curve detection method, first electric energy meter is powered on and initialized, and judges to fall whether zero curve mark has been set, if without having set, then open up the voltage caching of A, B, C three-phase, every phase opens up three, and for storing voltage value per second, then electric energy meter powers on normal operation, zero curve event is fallen in detection per second, zero curve status indicator is fallen in judgement, if being currently at zero curve state, the end of zero curve event is fallen in judgement；If be currently at it is non-fall zero curve state, judgement fall zero curve event beginning.Compared with prior art, the present invention is adjusted without the three-phase meter for falling zero line detection function by simple hardware parameter for compatible, and by the cooperation of software algorithm, zero cost realizes zero line detection function.
Description
Technical field
The present invention relates to the relevant detection schemes of three-phase intelligent table more particularly to a kind of intelligent electric energy meter to fall zero curve detection side
Method.
Background technique
Electric energy meter is the instrument for measuring electric energy, also known as kilowatt-hour meter, energy meter, kilowatt-hour table, refers to the various electricity of measurement
The instrument of amount.
Zero curve is the route that Circuit Fault on Secondary Transformer neutral point is drawn, and constitutes circuit with phase line and is powered to electrical equipment.
Current electric energy meter circuit, three-phase voltage sampling resistor is balanced load, therefore the circuit of these electric energy meters is simultaneously
It is not the circuit for falling zero line detection function, can not just configures zero line detection function.And zero curve detection is fallen in setting on electric energy meter
Function may make that whether three-phase meter detection meter connects zero curve reliable, can be used in monitoring part stealing electricity phenomenon.
Summary of the invention
The present invention aiming at the shortcomings in the prior art, provides a kind of intelligent electric energy meter and falls zero curve detection method, is used for three
Whether phase table detection meter connects zero curve reliable, for monitoring part stealing electricity phenomenon.
In order to solve the above-mentioned technical problem, the present invention is addressed by following technical proposals: a kind of upper intelligent electric energy meter
Fall zero curve detection method, comprising:
Step 1: electric energy meter is powered on and initialized, and judges to fall whether zero curve mark has been set, if having set, is shown
Zero curve event has occurred before electric energy meter power down, terminates zero curve event at this time, if entering step B without having set；
Step 2: the voltage caching of A, B, C three-phase is opened up, every phase opens up three, for storing voltage value per second；
Step 3: electric energy meter powers on normal operation, and zero curve event is fallen in detection per second, and zero curve status indicator is fallen in judgement, if
It is currently at zero curve state, then the end of zero curve event is fallen in judgement, enters step five；If be currently at it is non-fall zero curve shape
State, then the beginning of zero curve event is fallen in judgement, enters step four；
Step 4: judging following three condition: condition a, when the minimum voltage of three-phase is greater than 50% voltage rating；Item
Part b, current Voltage unbalance rate is less than 5%；Condition c, the variation of current three-phase voltage and the three-phase voltage of first three second is as follows
In range, A phase voltage variation range is [16%, 26%], and B phase voltage variation range is [- 30%, -20%], and C phase voltage changes model
It encloses for [4%, 14%]；If meeting three conditions simultaneously, then it is assumed that fall the generation of zero curve event, electric energy meter sets the generation of zero curve event
Mark；
Step 5: judging following three condition: condition a, when the minimum voltage of three-phase is less than 50% voltage rating；
Condition b, current Voltage unbalance rate are greater than 5%；The variation of condition c, the three-phase voltage of first three second and current three-phase voltage is such as
In lower range, A phase voltage variation range is [16%, 26%], and B phase voltage variation range is [- 30%, -20%], the variation of C phase voltage
Range is [4%, 14%]；If meeting the either condition in the above third condition, assert that falling zero curve event terminates, electric energy meter is set
Fall the mark that zero curve event terminates.
The present invention is adjusted without the three-phase meter for falling zero line detection function by simple hardware parameter for compatible, is passed through
The cooperation of software algorithm, zero cost realize zero line detection function.
Detailed description of the invention
Fig. 1 is the voltage of original metering chip front end using circuit.
Fig. 2 is the voltage of metering chip front end of the invention using circuit.
Specific embodiment
Present invention is further described in detail with specific embodiment with reference to the accompanying drawing: as shown in Figure 1 to Figure 2, one
Kind intelligent electric energy meter falls zero curve detection method, comprising:
Step 1: electric energy meter is powered on and initialized, and judges to fall whether zero curve mark has been set, if having set, is shown
Zero curve event has occurred before electric energy meter power down, terminates zero curve event at this time, if entering step B without having set；
Step 2: the voltage caching of A, B, C three-phase is opened up, every phase opens up three, for storing voltage value per second；
Step 3: electric energy meter powers on normal operation, and zero curve event is fallen in detection per second, and zero curve status indicator is fallen in judgement, if
It is currently at zero curve state, then the end of zero curve event is fallen in judgement, enters step five；If be currently at it is non-fall zero curve shape
State, then the beginning of zero curve event is fallen in judgement, enters step four；
Step 4: judging following three condition: condition a, when the minimum voltage of three-phase is greater than 50% voltage rating；Item
Part b, current Voltage unbalance rate is less than 5%；Condition c, the variation of current three-phase voltage and the three-phase voltage of first three second is as follows
In range, A phase voltage variation range is [16%, 26%], and B phase voltage variation range is [- 30%, -20%], and C phase voltage changes model
It encloses for [4%, 14%]；If meeting three conditions simultaneously, then it is assumed that fall the generation of zero curve event, electric energy meter sets the generation of zero curve event
Mark；
Step 5: judging following three condition: condition a, when the minimum voltage of three-phase is less than 50% voltage rating；
Condition b, current Voltage unbalance rate are greater than 5%；The variation of condition c, the three-phase voltage of first three second and current three-phase voltage is such as
In lower range, A phase voltage variation range is [16%, 26%], and B phase voltage variation range is [- 30%, -20%], the variation of C phase voltage
Range is [4%, 14%]；If meeting the either condition in the above third condition, assert that falling zero curve event terminates, electric energy meter is set
Fall the mark that zero curve event terminates.
Whether the present invention for three-phase meter detection meter connects zero curve reliable, for monitoring part stealing electricity phenomenon.For being compatible with
It without the three-phase meter for falling zero line detection function, is adjusted by simple hardware parameter, by the cooperation of software algorithm, zero cost is real
Now fall zero line detection function.
The current existing circuit for not having zero line detection function, as shown in Fig. 1, three-phase voltage sampling resistor is flat
Weighing apparatus load；And band provided by the invention falls the circuit of zero line detection function, and as shown in Fig. 2, three-phase voltage sampling resistor right and wrong
Balanced load.After meter falls zero curve, according to the imbalance of sampling resistor and the balanced load of ammeter power supply, three-phase will lead to
Voltage forms new central point N ', N ' and N after overload a pressure difference, and according to current circuit, N ' can be to close to B phase
Voltage is close, and the B phase voltage for causing metering chip to be measured reduces, while A, C phase voltage increase.In this way, by above-mentioned special
The software algorithm of door can complete the function of falling zero curve detection.
The present invention relies on attached band shown in Fig. 2 and falls the circuit of zero line detection function, to realize the function of zero curve detection.
Protection scope of the present invention includes but is not limited to embodiment of above, and protection scope of the present invention is with claims
Subject to, replacement, deformation, the improvement that those skilled in the art that any pair of this technology is made is readily apparent that each fall within of the invention
Protection scope.
The present invention is adjusted without the three-phase meter for falling zero line detection function by simple hardware parameter for compatible, is passed through
The cooperation of software algorithm, zero cost realize zero line detection function.
Claims (1)
1. a kind of intelligent electric energy meter falls zero curve detection method, it is characterised in that: including
Step 1: electric energy meter is powered on and initialized, and judges to fall whether zero curve mark has been set, if having set, shows electric energy
Zero curve event has occurred before table power down, terminates zero curve event at this time, if entering step B without having set；
Step 2: the voltage caching of A, B, C three-phase is opened up, every phase opens up three, for storing voltage value per second；
Step 3: when electric energy meter powers on normal operation, zero curve event is fallen in detection per second, and zero curve status indicator is fallen in judgement, if
It is currently at zero curve state, then enters step five, the end of zero curve event is fallen in judgement；If be currently at it is non-fall zero curve shape
State then enters step four, and the beginning of zero curve event is fallen in judgement；
Step 4: judging following three condition: condition a, when the minimum voltage of three-phase is greater than 50% voltage rating；Condition b,
Current Voltage unbalance rate is less than 5%；The variation of the three-phase voltage of condition c, current three-phase voltage and first three second is in following range
Interior, A phase voltage variation range is [16%, 26%], and B phase voltage variation range is [- 30%, -20%], and C phase voltage variation range is
[4%, 14%]；If meeting three conditions simultaneously, then it is assumed that fall the generation of zero curve event, electric energy meter sets the mark of zero curve event generation
Will；
Step 5: judging following three condition: condition a, when the minimum voltage of three-phase is less than 50% voltage rating；Condition
B, current Voltage unbalance rate are greater than 5%；The variation of condition c, the three-phase voltage of first three second and current three-phase voltage is in following model
In enclosing, A phase voltage variation range is [16%, 26%], and B phase voltage variation range is [- 30%, -20%], C phase voltage variation range
For [4%, 14%]；If meeting the either condition in tri- conditions of above a, b and c, assert that falling zero curve event terminates, electric energy meter is set
Fall the mark that zero curve event terminates.
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| CN201610595731.4A CN106291089B (en) | 2016-07-27 | 2016-07-27 | A kind of intelligent electric energy meter falls zero curve detection method |
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| CN201610595731.4A CN106291089B (en) | 2016-07-27 | 2016-07-27 | A kind of intelligent electric energy meter falls zero curve detection method |
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| CN106291089A CN106291089A (en) | 2017-01-04 |
| CN106291089B true CN106291089B (en) | 2019-04-12 |
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| CN109490815B (en) * | 2018-09-27 | 2020-10-27 | 宁波三星智能电气有限公司 | Three-phase ammeter broken zero line detection circuit and detection method thereof |
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| JP2007048859A (en) * | 2005-08-09 | 2007-02-22 | Teiji Toribami | Three-phase four wire system power transformer and three-phase four wire system low voltage power distribution system using same |
| CN201233430Y (en) * | 2008-06-24 | 2009-05-06 | 中兴通讯股份有限公司 | Zero dropping detection device for transformer while biasing |
| CN104698291A (en) * | 2015-02-03 | 2015-06-10 | 杭州海兴电力科技股份有限公司 | Detection circuit and detection method for three-phase four-wire system defective zero line function |
| CN105182177A (en) * | 2015-07-15 | 2015-12-23 | 深圳市华沃表计科技有限公司 | Method for detecting actual power grid power supply state in three-phase meter zero line breaking condition |
| CN205246754U (en) * | 2015-11-27 | 2016-05-18 | 珠海中慧微电子股份有限公司 | Smart electric meter's measurement and communication circuit |
-
2016
- 2016-07-27 CN CN201610595731.4A patent/CN106291089B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007048859A (en) * | 2005-08-09 | 2007-02-22 | Teiji Toribami | Three-phase four wire system power transformer and three-phase four wire system low voltage power distribution system using same |
| CN201233430Y (en) * | 2008-06-24 | 2009-05-06 | 中兴通讯股份有限公司 | Zero dropping detection device for transformer while biasing |
| CN104698291A (en) * | 2015-02-03 | 2015-06-10 | 杭州海兴电力科技股份有限公司 | Detection circuit and detection method for three-phase four-wire system defective zero line function |
| CN105182177A (en) * | 2015-07-15 | 2015-12-23 | 深圳市华沃表计科技有限公司 | Method for detecting actual power grid power supply state in three-phase meter zero line breaking condition |
| CN205246754U (en) * | 2015-11-27 | 2016-05-18 | 珠海中慧微电子股份有限公司 | Smart electric meter's measurement and communication circuit |
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