CN104698291B - Three-phase four-wire system lacks zero curve Function detection circuit and detection method - Google Patents
Three-phase four-wire system lacks zero curve Function detection circuit and detection method Download PDFInfo
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- CN104698291B CN104698291B CN201510055435.0A CN201510055435A CN104698291B CN 104698291 B CN104698291 B CN 104698291B CN 201510055435 A CN201510055435 A CN 201510055435A CN 104698291 B CN104698291 B CN 104698291B
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Abstract
The present invention relates to three-phase four-wire systems to lack zero curve Function detection circuit and detection method.Purpose is to provide a kind of detection circuit and detection method, and at three-phase four-wire system intelligent electric meter end, whether i.e. detectable zero curve accesses.Scheme：Detection circuit includes optocoupler IC1, the ends UN of its emitting side are connected through switching circuit with systematically COM, the other end is divided into three tunnels, it is connected with the A phases in three-phase voltage after resistance R4, R3, R2, R1 and diode D12 for being concatenated all the way, it is connected with the B phases in three-phase voltage after resistance R8, R7, R6, R5 and diode D13 for being concatenated all the way, is connected with the C phases in three-phase voltage after resistance R12, R11, R10, R9 and diode D14 for being concatenated all the way；One pin of optocoupler IC1 receiving sides is grounded, waveform of another pin Testin outputs for judging whether scarce zero curve.The present invention is used to detect the zero curve state at three-phase four-wire system alternating-current watt-hour meter end.
Description
Technical field
The present invention relates to a kind of three-phase four-wire systems to lack zero curve Function detection circuit and detection method, is mainly used for effectively examining
Survey the zero curve state at three-phase four-wire system alternating-current watt-hour meter end.
Background technology
In current international, domestic three phase and four wire circuit system, due to presence (the i.e. distribution transformer neutrality of zero curve
Point ground connection is intact) so that three-phase voltage keeps stablizing and balance, and neutral-point displacement does not occur with the imbalance of threephase load.
Zero curve constitutes an effective entirety with A, B, C triple line.In the case where zero curve connection is intact, even if A, B, C three-phase are appointed
A phase voltage of anticipating disconnects, other two phase loads still can work in normal voltage.If zero curve disconnects, even if three-phase
But as long as load use is asynchronous neutral-point displacement phenomenon will also occur for load balance, needless to say in the case of laod unbalance
Lead to imbalance of three-phase voltage, indirectly so that each phase load even damages electrical equipment since unstable voltage does not work.
Make a general survey of international and domestic, it is very rare that three-phase four-wire system electric energy meter terminal lacks zero line detection function utilization.Traditional
Way is (sensor to be used i.e. on zero curve, such as using zero curve sampling functions：Mutual inductor) and firewire same size sampled measurements
Detection zero curve status function is had reached, whole table volume had not only been added significantly to but also had wasted material！
Invention content
The technical problem to be solved by the present invention is to：A kind of scarce zero curve work(of three-phase four-wire system is provided in view of the above problems
Energy detection circuit and detection method, can effectively detect whether zero curve accesses at three-phase four-wire system intelligent electric meter end.
The technical solution adopted in the present invention is：Three-phase four-wire system lacks zero curve Function detection circuit, it is characterised in that：It is wrapped
Optocoupler IC1 is included, the ends UN of emitting side are connected through switching circuit with systematically COM, and the other end is divided into three tunnels, is concatenated all the way
It is connected with the A phases in three-phase voltage after resistance R4, R3, R2, R1 and diode D12, resistance R8, R7, R6, the R5 being concatenated all the way
It is connected with the B phases in three-phase voltage with after diode D13, resistance R12, R11, R10, the R9 and diode D14 being concatenated all the way
It is connected afterwards with the C phases in three-phase voltage；One pin of optocoupler IC1 receiving sides is grounded, and the Testin outputs of another pin are used for
Judge whether the waveform of scarce zero curve.
The switching circuit includes triode Q1, and the relay V1 being connected with the output end of triode Q1, wherein
Two output ends of relay V1 are separately connected the ends UN and systematically COM.
The triode Q1 uses the PNP type triode of model BC807-40LT1, base stage to meet Test_ through resistance R14
Control, emitter connect 3.3V voltages and meet Test_control through resistance R15, and collector is through resistance R13 and relay V1 phases
Even；Test_control high level is controlled, then without lacking zero curve detection, controls Test_control low levels, is then lacked
Zero curve detects.
The relay V1 uses the solid-state relay of model PS7141-1B/AQV414, and pin 1 is through resistance R13 and three
The collector of pole pipe Q1 is connected, and pin 4 connects the ends UN, 6 welding system of pin ground COM.
Three-phase four-wire system lacks zero curve function detecting method, it is characterised in that including：
In the case where meter accesses two-phase or three-phase electricity, control Test_control is low level, with the interruption of 1KHz
The waveform of frequency detecting pin Testin, respectively add up waveform in high level number and low level number；When high level
Number and low level number and for 24 when, control Test_control be high level；
Judge whether low level number is more than high level number, if so, think currently not lack zero curve state, if it is not,
Then think currently for scarce zero curve state.
Advantageous effect of the present invention is to provide a kind of open Function detection circuit, by detecting optocoupler IC1 pins
The waveform of Testin, the state of zero curve can effectively be detected at three-phase four-wire system intelligent electric meter end (connection is disconnected by reaching
Open), the zero curve status signal of detection is exported, it is that subsequently scarce zero curve protection circuit or alarm signal provide foundation not limit.
The switch that the present invention can also control detection function (closes detection function, Test_ by controlling Test_control for high level
Control carrys out open detection function for low level), in favor of certain fc-specific test FC occasions, caused by detection zero curve state other
Function is interfered, more open and commonly usedization.
Description of the drawings
Fig. 1 is schematic diagram (the SOC system platform operating voltages that three-phase four-wire system functional form of the present invention lacks zero curve detection circuit
3.3VDC)。
Fig. 2 is the voltage effective value test chart that three-phase 230VAC inputs any one the resistance both ends R1 to R12 when having zero curve.
Fig. 3 is the voltage effective value test chart that three-phase 230VAC inputs any one the resistance both ends R1 to R12 when without zero curve.
When Fig. 4 is three-phase 230VAC, there is zero curve to no zero curve waveform variation diagram.
Fig. 5 is the portions the A enlarged drawing of Fig. 4.
Fig. 6 is the portions the B enlarged drawing of Fig. 4.
Fig. 7 is the arbitrary two-phase 230VAC of input, there is zero curve test chart.
Fig. 8 is the arbitrary two-phase 230VAC of input, no zero curve test chart.
Fig. 9 is the flow chart of detection method.
Specific implementation mode
As shown in Figure 1, it is to utilize modern highly integrated electronics electricity that the present embodiment three-phase four-wire system, which lacks zero curve Function detection circuit,
The functional circuit whether detection zero curve correctly accesses in intelligent electric meter (three-phase and four-line electric energy meter) realized in road.Due to A, B, C three-phase
There are 120 degree of phase angles between electricity, at least input two-phase voltage electric energy meter just can be with when not accessing zero curve for three-phase and four-line electric energy meter
Normal work.So in the case that three-phase electric energy meter first has to detection at least two-phase voltage input, it could open and lack zero curve inspection
Brake.The present embodiment is reference with 3*230/400V, 50Hz power grids, and detection circuit specifically includes optocoupler IC1, emitting side
The ends UN are connected through switching circuit with systematically COM, and the other end is divided into three tunnels, resistance R4, R3, R2, R1 for being concatenated all the way and two
Be connected with the A phases in three-phase voltage after pole pipe D12, after resistance R8, R7, R6, R5 and diode D13 for being concatenated all the way with three-phase
B phases in voltage are connected, after resistance R12, R11, R10, R9 and diode D14 for being concatenated all the way with the C phases in three-phase voltage
It is connected；One pin of optocoupler IC1 receiving sides is grounded, wave of another pin Testin outputs for judging whether scarce zero curve
Shape, while connecing 3.3V voltages through pull-up resistor R16.
The switching circuit includes triode Q1, and the relay V1 being connected with the output end of triode Q1；Wherein
Triode Q1 uses the PNP type triode of model BC807-40LT1, base stage to meet input control end Test_ through resistance R14
Control, emitter connect 3.3V voltages and meet input control end Test_control through resistance R15, collector through resistance R13 with
Relay V1 is connected；Test_control high level is controlled, then without lacking zero curve detection, the low electricity of control Test_control
It is flat, then it carries out lacking zero curve detection；Relay V1 uses the solid-state relay of model PS7141-1B/AQV414, and pin 1 is through electricity
Resistance R13 is connected with the collector of triode Q1, and pin 2,3 is grounded, and pin 4 connects the ends UN (end of incoming cables of voltage zero curve), and pin 6 connects
Systematically COM, by input control end test_control generate trigger signal control output end break-make (ends UN with systematically
The break-make of COM).
When input control end test_control is high level, without lacking zero curve detection, triode Q1 shutdowns, relay
The input control end Triggerless of V1, output-controlled end are failure to actuate, and the ends UN are connected to systematically COM, at this point, in spite of connecing
Enter zero curve, the emitting side of optocoupler IC1 can be formed into a loop.When input control end test_control is low level, lacked
Zero curve detects, and triode Q1 conductings, the input control end of relay V1 generates trigger signal, the UN of cut-in relay V1 output ends
It is disconnected with COM, by detecting the waveform of pin TESTNI to determine whether lacking zero curve.It is low level item in test_control
Optocoupler IC1 emitting sides could be formed into a loop when accessing zero curve under part, only in ammeter, and Testin can generate trigger signal；Not yet
When having zero curve access, optocoupler IC1 emitting sides will not be formed into a loop, and Testin is high level always.
The voltage effective value at any one the resistance both ends R1 to R12 when three-phase 230VAC inputs have zero curve Fig. 2 combinations Fig. 1
Test measures electric current=39.8 ÷ 75k=0.53mA of voltage effective value calculating according to oscillograph.
Fig. 3 combinations Fig. 1 effective voltages at any one the resistance both ends R1 to R12 when three-phase 230VAC inputs are without zero curve are surveyed
Examination measures electric current=35.8 ÷ 75k=0.48mA of voltage effective value calculating according to oscillograph.
When Fig. 4, Fig. 5, Fig. 6 description input three-phase 230VAC, there is zero curve to no zero curve waveform variation diagram；When having zero curve, after
After electric appliance V1 is disconnected, the level of pin Testin is not raised；When without zero curve, after relay V1 is disconnected, pin Testin's
Level is raised.
Fig. 7 is inputting arbitrary two-phase 230VAC, there is zero curve test chart.Under the premise of existing for zero curve, because input is to appoint
Meaning two-phase voltage, so lacking 120 ° of electric currents in one cycle, so having one third in a cycle in figure below waveform
High level occurs.
Fig. 8 is inputting arbitrary two-phase 230VAC, no zero curve test chart.When inputting arbitrary two-phase voltage, the shape of zero curve is lacked
Under state, it is assumed that arbitrary two-phase voltage is A phases and B phases, and there are 120 degree of phase differences with B phases for A phases.So at a time A phases are in
Half-wave positive half B phase flows to B in negative half, current direction from A；It is in half-wave negative half B phases in another moment A phases
In positive half, electric current flows to A from B, the two time at intervals are about 10ms.
As shown in figure 9, the present embodiment three-phase four-wire system lacks zero curve function detecting method, including：
The interval time 10s for lacking zero curve detection is set, and the interval time per 10s arrives, then judges whether meter accesses two-phase
Or three-phase electricity；
In the case where meter accesses two-phase or three-phase electricity, control Test_control is low level, opens and lacks zero curve inspection
Brake, with the waveform of the interruption frequency detection pin Testin of 1KHz, the number of high level and low electricity in the waveform that adds up respectively
Flat number；When high level number and low level number and when being 24, control Test_control is high level, closes scarce zero
Line detection function；In the case that meter does not access two-phase or three-phase electricity, control Test_control is high level, closes and lacks zero curve
Detection function；
Judge whether low level number is more than high level number, if so, think currently not lack zero curve state, if it is not,
Then think currently for scarce zero curve state.
Claims (4)
1. a kind of three-phase four-wire system lacks the method that zero curve Function detection circuit carries out lacking zero detection, it is characterised in that：
Detection circuit includes optocoupler IC1, and the end of incoming cables UN of the voltage zero curve of emitting side is through switching circuit and systematically COM phases
Even, the other end is divided into three tunnels, after resistance R4, R3, R2, R1 and diode D12 for being concatenated all the way with the A phases in three-phase voltage
It is connected, is connected with the B phases in three-phase voltage after resistance R8, R7, R6, R5 and diode D13 for being concatenated all the way, is concatenated all the way
Resistance R12, R11, R10, R9 and diode D14 after be connected with the C phases in three-phase voltage；One of optocoupler IC1 receiving sides draws
Foot is grounded, waveform of another pin Testin outputs for judging whether scarce zero curve；
The switching circuit includes triode Q1, and the relay V1 being connected with the output end of triode Q1, wherein relay
Two output ends of device V1 are separately connected the end of incoming cables UN and systematically COM of voltage zero curve；Triode Q1 base stages connect through resistance R14
Input control end Test_control, emitter connect 3.3V voltages and meet input control end Test_control through resistance R15,
Collector is connected through resistance R13 with relay V1；
In the case where meter accesses two-phase or three-phase electricity, control input control end Test_control is low level, with 1KHz
Interruption frequency detection pin Testin waveform, the number of high level and low level number in the waveform that adds up respectively；Work as height
Level number and low level number and when being 24, control input control end Test_control is high level；Judge low level
Whether number is more than high level number, if so, thinking current not lack zero curve state, if not, then it is assumed that current for scarce zero curve
State.
2. three-phase four-wire system according to claim 1 lacks zero curve Function detection circuit and carries out the method for lacking zero detection, special
Sign is：The triode Q1 uses the PNP type triode of model BC807-40LT1.
3. three-phase four-wire system according to claim 1 lacks zero curve Function detection circuit and carries out the method for lacking zero detection, special
Sign is：The relay V1 uses the solid-state relay of model PS7141-1B/AQV414, and pin 1 is through resistance R13 and three
The collector of pole pipe Q1 is connected, and pin 4 meets the end of incoming cables UN of voltage zero curve, 6 welding system of pin ground COM.
4. three-phase four-wire system according to claim 1 lacks zero curve Function detection circuit and carries out the method for lacking zero detection, special
Sign is：Input control end Test_control high level is controlled, then without lacking zero curve detection, control input control end
Test_control low levels then carry out lacking zero curve detection.
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| CN201510055435.0A CN104698291B (en) | 2015-02-03 | 2015-02-03 | Three-phase four-wire system lacks zero curve Function detection circuit and detection method |
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| CN201510055435.0A CN104698291B (en) | 2015-02-03 | 2015-02-03 | Three-phase four-wire system lacks zero curve Function detection circuit and detection method |
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| CN104698291B true CN104698291B (en) | 2018-09-25 |
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| CN105182177B (en) * | 2015-07-15 | 2018-06-01 | 深圳市华沃表计科技有限公司 | A kind of method of actual electric network power supply state in the case of detection three-phase meter line off zero |
| CN105067900B (en) * | 2015-07-29 | 2018-07-10 | 广东美的暖通设备有限公司 | Three phase mains lacks zero curve detection method and device |
| CN106405305B (en) * | 2015-07-30 | 2024-02-27 | 浙江正泰电器股份有限公司 | Zero line phase failure detection circuit and method for detecting zero line phase failure |
| CN105486936B (en) * | 2015-12-04 | 2019-06-14 | 易事特集团股份有限公司 | Uninterrupted power supply with lack zero line detection circuitry |
| CN106291089B (en) * | 2016-07-27 | 2019-04-12 | 宁波三星医疗电气股份有限公司 | A kind of intelligent electric energy meter falls zero curve detection method |
| CN106645930A (en) * | 2016-11-23 | 2017-05-10 | 浙江恩鸿电子有限公司 | Three-phase four-wire electric energy metering device having null line missing detection function |
| CN108594066A (en) * | 2018-05-25 | 2018-09-28 | 顺来电新能源科技有限公司 | A kind of wiring testing device of alternating-current charging pile |
| 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 |
| CN109358310B (en) * | 2018-12-03 | 2024-03-22 | 烟台东方威思顿电气有限公司 | Device and method for detecting broken zero line of three-phase four-wire electric energy meter |
| CN110988779A (en) * | 2019-11-04 | 2020-04-10 | 广西电网有限责任公司 | Method and system for detecting zero line lacking function of three-phase four-wire electric energy meter |
| CN113009380B (en) * | 2020-12-31 | 2022-11-04 | 宁波三星医疗电气股份有限公司 | Neutral line disconnection fault detection method based on electric energy meter and readable storage medium |
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Effective date of registration: 20190830 Address after: Hangzhou City, Zhejiang province 310011 Moganshan Road No. 1418-5 Co-patentee after: Nanjing Haixing Power Technology Co. Ltd. Patentee after: Hangzhou Hexing Electrical Co., Ltd. Address before: Hangzhou City, Zhejiang province 310011 Moganshan Road No. 1418-5 (Shangcheng Industrial Park) Patentee before: Hangzhou Hexing Electrical Co., Ltd. |