CN104698291A - Detection circuit and detection method for three-phase four-wire system defective zero line function - Google Patents

Detection circuit and detection method for three-phase four-wire system defective zero line function Download PDF

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Publication number
CN104698291A
CN104698291A CN201510055435.0A CN201510055435A CN104698291A CN 104698291 A CN104698291 A CN 104698291A CN 201510055435 A CN201510055435 A CN 201510055435A CN 104698291 A CN104698291 A CN 104698291A
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phase
zero line
control
wire system
resistance
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CN201510055435.0A
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CN104698291B (en
Inventor
周良璋
吕锋
卜俭青
张向程
朱程鹏
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Nanjing Haixing Power Grid Technology Co Ltd
Hangzhou Hexing Electrical Co Ltd
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Hangzhou Hexing Electrical Co Ltd
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Abstract

The invention relates to a detection circuit and a detection method for a three-phase four-wire system defective zero line function. The invention aims to provide a detection circuit and a detection method. The zero line can be detected at a three-phase four-wire system smart electric meter terminal to check if it is accessed. The scheme is as below: the detection circuit comprises an optical coupler IC 1, an UN end of its emitting side is connected with a systematic COM (component object model) through a switch circuit, and the other terminal is divided into three paths, wherein one path is connected with A phase in the three-phase voltage through resistors R4, R3, R2, R1 and a diode D12 which are linked in series, one path is connected with a B phase in the three-phase voltage through resistors R8, R7, R6, R5 and a diode D13 which are linked in series, and a path is connected with a C phase in the three-phase voltage through resistors R12, R11, R10, 19 and a diode D14 which are linked in series; one pin at the receiving side of the optical coupler IC 1 is grounded, and the other pin Testin output is used for judging if it is waveform of the defective zero line. The detection circuit and a detection method are used for detecting the zero line state of the three-phase four-wire system smart electric meter terminal.

Description

Three-phase four-wire system lacks zero line Function detection circuit and detection method
Technical field
The present invention relates to a kind of three-phase four-wire system and lack zero line Function detection circuit and detection method, be mainly used in the zero line state effectively detecting three-phase four-wire system alternating-current watt-hour meter end.
Background technology
In three phase and four wire circuit system international, domestic at present, due to the existence (namely substation transformer neutral ground is intact) of zero line, make three-phase voltage keep stable and balance, with the imbalance of threephase load, neutral-point displacement does not occur.Zero line and A, B, C triple-phase line constitute an effective entirety.When zero line connects intact, even if any phase voltage of A, B, C three-phase disconnects, other two phase loads still can work in normal voltage situation.If zero line disconnects, even if threephase load balances, as long as but load uses asynchronous, also will there is neutral-point displacement phenomenon, cause imbalance of three-phase voltage under saying nothing of laod unbalance situation, indirectly make each phase load even damage consumer because the voltage of instability does not work.
Make a general survey of international and domestic, three-phase four-wire system electric energy meter meter terminal lacks zero line detection function and uses very rare.Traditional way adopts zero line sampling functions (namely use sensor on zero line, as: mutual inductor) to reach with live wire same size sampled measurements to detect zero line status function, not only significantly adds whole table volume but also waste material!
Summary of the invention
Whether the technical problem to be solved in the present invention is: provide a kind of three-phase four-wire system to lack zero line Function detection circuit and detection method for above-mentioned Problems existing, effectively can detect zero line access 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 line Function detection circuit, it is characterized in that: it comprises optocoupler IC1, the UN end of its emitting side is connected with systematically COM through on-off circuit, the other end is divided into three tunnels, one tunnel is connected with the A phase in three-phase voltage after diode D12 through resistance R4, R3, R2, R1 of series connection, one tunnel is connected with the B phase in three-phase voltage after diode D13 through resistance R8, R7, R6, R5 of series connection, and a road is connected with the C phase in three-phase voltage after diode D14 through resistance R12, R11, R10, R9 of series connection; A pin ground connection of optocoupler IC1 receiver side, another pin Testin exports the waveform for judging whether scarce zero line.
Described on-off circuit comprises triode Q1, and two output terminals of the relay V1 be connected with the output terminal of this triode Q1, its repeat circuit V1 connect UN end and systematically COM respectively.
Described triode Q1 adopts the PNP type triode of model BC807-40LT1, and its base stage meets Test_control through resistance R14, and emitter connects 3.3V voltage and meets Test_control through resistance R15, and collector is connected with relay V1 through resistance R13; Control Test_control high level, then do not carry out scarce zero line detection, and control Test_control low level then carries out scarce zero line detection.
Described relay V1 adopts the solid-state relay of model PS7141-1B/AQV414, and its pin 1 is connected with the collector of triode Q1 through resistance R13, and pin 4 connects UN end, pin 6 welding system ground COM.
Three-phase four-wire system lacks zero line function detecting method, it is characterized in that comprising:
When showing meter access two-phase or three-phase electricity, controls Test_control is low level, detects the waveform of pin Testin with the interruption frequency of 1KHz, the number of times of high level and low level number of times in the waveform that adds up respectively; When high level number of times and low level number of times and be 24 time, control Test_control is high level;
Judging whether low level number of times is greater than high level number of times, if so, then thinking current for not lacking zero line state, if not, then thinking current for lacking zero line state.
Beneficial effect of the present invention is to provide a kind of open Function detection circuit; by detecting the waveform of optocoupler IC1 pin Testin; reach the state (connect or disconnect) that effectively can detect zero line at three-phase four-wire system intelligent electric meter end; the zero line status signal of output detections, what do not limit provides foundation for follow-up scarce zero line protection circuit or alerting signal.The switch that the present invention can also control measuring ability (is that high level closes measuring ability by control Test_control, Test_control is that low level carrys out open detection function), be beneficial to some fc-specific test FC occasion, detect other functions interference that zero line state causes, more open and general application.
Accompanying drawing explanation
Fig. 1 is the schematic diagram (SOC system platform operating voltage 3.3VDC) that three-phase four-wire system functional form of the present invention lacks zero line testing circuit.
Fig. 2 is the voltage effective value test pattern that three-phase 230VAC inputs any one resistance two ends of R1 to R12 when having zero line.
Fig. 3 is the voltage effective value test pattern that three-phase 230VAC inputs without any one resistance two ends of R1 to R12 during zero line.
When Fig. 4 is three-phase 230VAC, there is zero line extremely without zero line waveform variation diagram.
Fig. 5 is the A portion enlarged drawing of Fig. 4.
Fig. 6 is the B portion enlarged drawing of Fig. 4.
Fig. 7 is any two-phase 230VAC of input, has zero line test pattern.
Fig. 8 is any two-phase 230VAC of input, without zero line test pattern.
Fig. 9 is the process flow diagram of detection method.
Embodiment
As shown in Figure 1, the present embodiment three-phase four-wire system lacks zero line Function detection circuit is utilize modern high integrated electronic circuit to realize detecting zero line whether correctly to access functional circuit in intelligent electric meter (three-phase and four-line electric energy meter).Owing to there are 120 degree of phase angles between A, B, C three-phase electricity, three-phase and four-line electric energy meter at least inputs two-phase voltage power table and just can normally work when not accessing zero line.So first three-phase electric energy meter will detect when having two phase voltages inputs at least, could open scarce zero line detection function.The present embodiment is with 3*230/400V, 50Hz electrical network is reference, testing circuit specifically comprises optocoupler IC1, the UN end of its emitting side is connected with systematically COM through on-off circuit, the other end is divided into three tunnels, one tunnel is connected with the A phase in three-phase voltage after diode D12 through resistance R4, R3, R2, R1 of series connection, one tunnel is connected with the B phase in three-phase voltage after diode D13 through resistance R8, R7, R6, R5 of series connection, and a road is connected with the C phase in three-phase voltage after diode D14 through resistance R12, R11, R10, R9 of series connection; A pin ground connection of optocoupler IC1 receiver side, another pin Testin exports the waveform for judging whether scarce zero line, connects 3.3V voltage through pull-up resistor R16 simultaneously.
Described on-off circuit comprises triode Q1, and the relay V1 be connected with the output terminal of this triode Q1; Wherein triode Q1 adopts the PNP type triode of model BC807-40LT1, its base stage meets input control end Test_control through resistance R14, emitter connects 3.3V voltage and meets input control end Test_control through resistance R15, and collector is connected with relay V1 through resistance R13; Control Test_control high level, then do not carry out scarce zero line detection, and control Test_control low level then carries out scarce zero line detection; Relay V1 adopts the solid-state relay of model PS7141-1B/AQV414, its pin 1 is connected with the collector of triode Q1 through resistance R13, pin 2,3 ground connection, pin 4 meets UN end (end of incoming cables of voltage zero line), pin 6 welding system ground COM, produces the break-make (break-make of UN end and systematically COM) of trigger pip control output end by input control end test_control.
When input control end test_control is high level, do not carry out scarce zero line detection, triode Q1 turns off, the input control end Triggerless of relay V1, output-controlled end is failure to actuate, and UN end is communicated with systematically COM, now, no matter whether access zero line, the emitting side of optocoupler IC1 can form loop.When input control end test_control is low level, carry out scarce zero line detection, triode Q1 conducting, the input control end of relay V1 produces trigger pip, UN and COM of cut-in relay V1 output terminal disconnects, and judges whether scarce zero line by the waveform detecting pin TESTNI.Under test_control is low level condition, only have in ammeter optocoupler IC1 emitting side when accessing zero line to form loop, Testin can produce trigger pip; When not having zero line to access, optocoupler IC1 emitting side can not form loop, and Testin is high level always.
The voltage effective value test at Fig. 2 composition graphs 1 any one resistance two ends of R1 to R12 when three-phase 230VAC input has zero line, records the electric current=39.8 ÷ 75k=0.53mA of voltage effective value calculating according to oscillograph.
Fig. 3 composition graphs 1 is tested without the effective voltage at any one resistance two ends of R1 to R12 during zero line in three-phase 230VAC input, records the electric current=35.8 ÷ 75k=0.48mA of voltage effective value calculating according to oscillograph.
When Fig. 4, Fig. 5, Fig. 6 describe input three-phase 230VAC, there is zero line extremely without zero line waveform variation diagram; When having zero line, after relay V1 disconnects, the level of pin Testin is not driven high; During without zero line, after relay V1 disconnects, the level of pin Testin is driven high.
Fig. 7, at any two-phase 230VAC of input, has zero line test pattern.Under the prerequisite that zero line exists, because be input as any two phase voltages, so lack 120 ° of electric currents in one-period, so there is the high level of 1/3rd to occur in figure below waveform in one-period.
Fig. 8 input any two-phase 230VAC, without zero line test pattern.When inputting any two phase voltage, under the state lacking zero line, supposing that any two phase voltages are A phase and B phase, there are 120 degree of phase differential in A phase and B phase.So at a time A phase is in half-wave positive half point B phase in negative half part, direction of current flows to B from A; Be in the negative half part B phase of half-wave in another moment A phase to divide in positive half, electric current flows to A from B, and these two time at intervals are approximately 10ms.
As shown in Figure 9, the present embodiment three-phase four-wire system lacks zero line function detecting method, comprising:
Arrange 10s interval time that scarce zero line detects, the interval time of every 10s arrives, then judge whether table meter accesses two-phase or three-phase electricity;
When showing meter access two-phase or three-phase electricity, controls Test_control is low level, opens and lacks zero line detection function, detects the waveform of pin Testin with the interruption frequency of 1KHz, the number of times of high level and low level number of times in the waveform that adds up respectively; When high level number of times and low level number of times and be 24 time, control Test_control is high level, closes and lacks zero line detection function; When table meter does not access two-phase or three-phase electricity, control Test_control is high level, closes and lacks zero line detection function;
Judging whether low level number of times is greater than high level number of times, if so, then thinking current for not lacking zero line state, if not, then thinking current for lacking zero line state.

Claims (5)

1. a three-phase four-wire system lacks zero line Function detection circuit, it is characterized in that: it comprises optocoupler IC1, the UN end of its emitting side is connected with systematically COM through on-off circuit, the other end is divided into three tunnels, one tunnel is connected with the A phase in three-phase voltage after diode D12 through resistance R4, R3, R2, R1 of series connection, one tunnel is connected with the B phase in three-phase voltage after diode D13 through resistance R8, R7, R6, R5 of series connection, and a road is connected with the C phase in three-phase voltage after diode D14 through resistance R12, R11, R10, R9 of series connection; A pin ground connection of optocoupler IC1 receiver side, another pin Testin exports the waveform for judging whether scarce zero line.
2. three-phase four-wire system according to claim 1 lacks zero line Function detection circuit, it is characterized in that: described on-off circuit comprises triode Q1, and two output terminals of the relay V1 to be connected with the output terminal of this triode Q1, its repeat circuit V1 connect UN end and systematically COM respectively.
3. three-phase four-wire system according to claim 2 lacks zero line Function detection circuit, it is characterized in that: described triode Q1 adopts the PNP type triode of model BC807-40LT1, its base stage meets Test_control through resistance R14, emitter connects 3.3V voltage and meets Test_control through resistance R15, and collector is connected with relay V1 through resistance R13; Control Test_control high level, then do not carry out scarce zero line detection, and control Test_control low level then carries out scarce zero line detection.
4. three-phase four-wire system according to claim 3 lacks zero line Function detection circuit, it is characterized in that: described relay V1 adopts the solid-state relay of model PS7141-1B/AQV414, its pin 1 is connected with the collector of triode Q1 through resistance R13, pin 4 connects UN end, pin 6 welding system ground COM.
5. three-phase four-wire system lacks a zero line function detecting method, it is characterized in that comprising:
When showing meter access two-phase or three-phase electricity, controls Test_control is low level, detects the waveform of pin Testin with the interruption frequency of 1KHz, the number of times of high level and low level number of times in the waveform that adds up respectively; When high level number of times and low level number of times and be 24 time, control Test_control is high level;
Judging whether low level number of times is greater than high level number of times, if so, then thinking current for not lacking zero line state, if not, then thinking current for lacking zero line state.
CN201510055435.0A 2015-02-03 2015-02-03 Three-phase four-wire system lacks zero curve Function detection circuit and detection method Active CN104698291B (en)

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Cited By (7)

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CN105067900A (en) * 2015-07-29 2015-11-18 广东美的暖通设备有限公司 Method and device for detecting lack of null line in three-phase power supply
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
CN105486936A (en) * 2015-12-04 2016-04-13 易事特集团股份有限公司 Uninterrupted power source having null-line-absence detection circuit
CN106291089A (en) * 2016-07-27 2017-01-04 宁波三星医疗电气股份有限公司 A kind of intelligent electric energy meter falls zero line detection method
CN109490815A (en) * 2018-09-27 2019-03-19 宁波三星智能电气有限公司 A kind of three-phase kilowatt-hour meter line detection circuit off zero and its detection method
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
CN113009380A (en) * 2020-12-31 2021-06-22 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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CN203551744U (en) * 2013-09-30 2014-04-16 宁波三星电气股份有限公司 Electric energy meter load switch state detection circuit
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Cited By (12)

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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
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
CN105067900A (en) * 2015-07-29 2015-11-18 广东美的暖通设备有限公司 Method and device for detecting lack of null line in three-phase power supply
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
CN105486936A (en) * 2015-12-04 2016-04-13 易事特集团股份有限公司 Uninterrupted power source having null-line-absence detection circuit
CN105486936B (en) * 2015-12-04 2019-06-14 易事特集团股份有限公司 Uninterruptible power supply with scarce zero curve detection circuit
CN106291089A (en) * 2016-07-27 2017-01-04 宁波三星医疗电气股份有限公司 A kind of intelligent electric energy meter falls zero line detection method
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
CN109490815A (en) * 2018-09-27 2019-03-19 宁波三星智能电气有限公司 A kind of three-phase kilowatt-hour meter line detection circuit off zero and its detection method
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
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
CN113009380A (en) * 2020-12-31 2021-06-22 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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