CN104459603A - Method and device for detecting three-phase three-wire energy measurement device - Google Patents

Method and device for detecting three-phase three-wire energy measurement device Download PDF

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Publication number
CN104459603A
CN104459603A CN201410829838.1A CN201410829838A CN104459603A CN 104459603 A CN104459603 A CN 104459603A CN 201410829838 A CN201410829838 A CN 201410829838A CN 104459603 A CN104459603 A CN 104459603A
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phase
phase sequence
phasor
voltage
line voltage
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CN201410829838.1A
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Chinese (zh)
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杨兴旺
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杨兴旺
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Abstract

The invention relates to the technical field of electrical equipment detection, in particular to a method and device for detecting a three-phase three-wire energy measurement device. According to the method and device for detecting three-phase three-wire energy measurement device, the related information and data of the three-phase three-wire energy measurement device are obtained through interrogation, a four-wire phasor diagram is drawn, and the operation state of the three-phase three-wire energy measurement device is further judged. The defects that in the prior art, on-site measurement workload is large and measured parameters are inaccurate when site test and judgment are carried out by a three-phase three-wire energy measurement device are overcome, the real-time performance and the rapidness of intelligent management of the measurement device are improved, and huge technical support can be generated on strong smart power grid construction of the State Grid Corporation of China.

Description

A kind of detection method of three-phase-three-wire energy measurement device and device
Technical field
The present invention relates to electric device maintenance technical field, particularly relates to a kind of detection method and device of three-phase-three-wire energy measurement device.
Background technology
Three-phase-three-wire energy measurement device through mutual inductor interstar connection has 7 connection terminals.During correct wiring, 2 ﹑ 4 ﹑ 6 ends meet pressure-wire A ﹑ B ﹑ C respectively; 1 ﹑ 3 terminal connects A phase current line respectively, and 5 ﹑ 7 ends connect C phase current line respectively.But in the measuring apparatus of actual motion, due to the negligence of attaching person or the inadequate of technical merit, the on-the-spot situation that still there is wrong line.Such as, comprise mutual inductor secondary run distance ﹑ Duan Lu ﹑ fuse cutout etc. and obviously cause the inaccurate circuit state of metering, also containing some common false wirings, as a phase or biphase current connect instead, electric current secondary connection phase error, voltage transformer secondary phase of line mistake, electric current and electricity press Xiang Wei ﹑ separate not corresponding etc.
If can not solve by Timeliness coverage, not only there is the risk of erroneous metrology in user's electricity, also can have influence on the smooth recovery of the electric power enterprise electricity charge; Meanwhile, An full Sheng Chan ﹑ operation control and the good service of electric power enterprise can also be had influence on.
The conventional method of current judgement three-phase-three-wire energy measurement device running status adopts the line electricity pressure ﹑ phase electricity of pincerlike phase meter live line measurement electric energy meter to flow the data such as ﹑ phasing degree, and test volume is large, and needs site work, brings very large trouble to work.
Summary of the invention
Large and need the defect of site work for data test amount in prior art, the invention provides a kind of detection method and device of three-phase-three-wire energy measurement device.
On the one hand, the invention provides a kind of detection method of three-phase-three-wire energy measurement device, comprising:
S1, call together survey described three-phase-three-wire energy measurement device status word, line voltage, phasing degree between line voltage, phase current, phasing degree between line voltage and phase current and total active power; Described ammeter status word comprises voltage phase sequence and electric current phase sequence etc.;
S2, judges whether described voltage phase sequence is positive phase sequence, if described voltage phase sequence is positive phase sequence, performs step S3, if described voltage phase sequence is negative phase sequence, performs step S5;
S3, judges whether described electric current phase sequence is positive phase sequence, if described electric current phase sequence is positive phase sequence, performs step S4, if described electric current phase sequence is negative phase sequence, performs step S5;
S4, calculate three phases active power sum, and judge whether the difference of described three phases active power sum and described total active power is less than preset value, if described difference is less than described preset value, process ends, if described difference is more than or equal to described preset value, performs step S5;
S5, generates four line phasor graphs according to the phasing degree between described line voltage, described line voltage, described phase current and the phasing degree between described line voltage and phase current;
S6, determines the mode of connection of described three-phase-three-wire energy measurement device according to described four alignment spirograms.
Further, described three phases active power sum adopts following formulae discovery:
P 1=U 24I 1cosα+U 64I 5cosβ
Wherein, P 1for three phases active power sum, U 24and U 64for line voltage, I 1and I 5for phase current, α is U 24with I 1angle, β is U 64with I 5angle.
Further, described step S5 specifically comprises:
S51, when load is perception, phasor exists right side; When load is capacitive, ? with between the angle of phasor;
S52, rotates four line phasor graphs, makes respectively with the comparison of voltage phasor motherboard hexagonal phase spirogram to obtain actual phase;
S53, according to the angle between described line voltage and phase current, obtains correct phase;
Described for phase current phasor, for reverse phasor, for line voltage phasor.
On the other hand, the present invention also provides a kind of pick-up unit of three-phase-three-wire energy measurement device, and described device comprises:
Calling survey module together, surveying phasing degree between ammeter status word, line voltage, line voltage, phase current, phasing degree between line voltage and phase current and total active power for calling together; Described ammeter status word comprises voltage phase sequence and electric current phase sequence;
First judge module, for judging whether described voltage phase sequence is positive phase sequence;
Second judge module, for when described voltage phase sequence is positive phase sequence, judges whether described electric current phase sequence is positive phase sequence;
3rd judge module, for be positive phase sequence when described voltage phase sequence and described electric current phase sequence is positive phase sequence time, calculate three phases active power sum, and judge whether the difference of described three phases active power sum and described total active power is less than preset value;
Generation module, when whether the difference for be negative phase sequence or described electric current phase sequence when described voltage phase sequence be negative phase sequence or described three phases active power sum and described total active power is more than or equal to preset value, generate four line phasor graphs according to the phasing degree between described line voltage, described line voltage, described phase current and the phasing degree between described line voltage and phase current;
Determine mode of connection module, for determining the mode of connection of described three-phase-three-wire energy measurement device according to described four alignment spirograms.
Further, described three phases active power sum adopts following formulae discovery:
P 1=U 24I 1cosα+U 64I 5cosβ
Wherein, P 1for three phases active power sum, U 24and U 64for line voltage, I 1and I 5for phase current, α is U 24with I 1angle, β is U 64with I 5angle.
Further, described generation module specifically for:
When load is perception, phasor exists right side; When load is capacitive, ? with between the angle of phasor;
Rotate four line phasor graphs, make respectively with the comparison of voltage phasor motherboard hexagonal phase spirogram to obtain actual phase;
According to the angle between described line voltage and phase current, obtain correct phase;
Described for phase current phasor, reverse phasor, for line voltage phasor.
The detection method of a kind of three-phase-three-wire energy measurement device provided by the invention and device, by calling relevant information, the data surveying and obtain phase three-wire three measuring apparatus together, draw four line phasor graphs, and and then judge the running status of described three-phase-three-wire energy measurement device.Solve the defects such as large, the measured parameter of on-the-spot test workload that phase three-wire three measuring apparatus on-the-spot test in prior art judges to cause is inaccurate, improve the real-time of measuring apparatus intelligent management, agility, strong intelligent grid is built to State Grid Corporation of China and will produce huge technical support effect.
Accompanying drawing explanation
Can understanding the features and advantages of the present invention clearly by reference to accompanying drawing, accompanying drawing is schematic and should not be construed as and carry out any restriction to the present invention, in the accompanying drawings:
Fig. 1 is the schematic flow sheet of the detection method of a kind of three-phase-three-wire energy measurement device in one embodiment of the invention;
Fig. 2 is voltage positive phase sequence and negative phase sequence schematic diagram in one embodiment of the invention;
Fig. 3 is that in one embodiment of the invention, load is electric current phasor schematic diagram during perception;
Fig. 4 is electric current phasor schematic diagram when load is capacitive in one embodiment of the invention;
Fig. 5 rotates 240 degree for inductive load four line phasor schematic diagram in one embodiment of the invention;
Fig. 6 is that in one embodiment of the invention, load is phase three-wire three measuring apparatus field wiring schematic diagram during perception;
Fig. 7 is that in one embodiment of the invention, inductive load polarity of voltage connects anti-four line phasor schematic diagram;
Fig. 8 is that in one embodiment of the invention, inductive load polarity of voltage connects anti-phase three-wire three measuring apparatus field wiring schematic diagram;
Fig. 9 is capacitive load four line phasor schematic diagram in one embodiment of the invention;
Figure 10 is phase three-wire three measuring apparatus field wiring schematic diagram when load is capacitive in one embodiment of the invention;
Figure 11 is the structural representation of the pick-up unit of a kind of three-phase-three-wire energy measurement device in one embodiment of the invention.
Embodiment
Now in conjunction with the accompanying drawings and embodiments technical solution of the present invention is further elaborated.
Fig. 1 shows the schematic flow sheet of the detection method of a kind of three-phase-three-wire energy measurement device in the present embodiment, and as shown in Figure 1, the detection method of a kind of three-phase-three-wire energy measurement device that the present embodiment provides, comprising:
S1, call together survey described three-phase-three-wire energy measurement device status word, line voltage, phasing degree between line voltage, phase current, phasing degree between line voltage and phase current and total active power; Described ammeter status word comprises voltage phase sequence and electric current phase sequence.
S2, judges whether described voltage phase sequence is positive phase sequence, if described voltage phase sequence is positive phase sequence, performs step S3, if described voltage phase sequence is negative phase sequence, performs step S5.
S3, judges whether described electric current phase sequence is positive phase sequence, if described electric current phase sequence is positive phase sequence, performs step S4, if described electric current phase sequence is negative phase sequence, performs step S5.
S4, calculate three phases active power sum, and judge whether the difference of described three phases active power sum and described total active power is less than preset value, if described difference is less than described preset value, process ends, if described difference is more than or equal to described preset value, performs step S5.
Described three phases active power sum adopts following formulae discovery:
P 1=U 24I 1cosα+U 64I 5cosβ
Wherein, P 1for three phases active power sum, U 24and U 64for line voltage, I 1and I 5for phase current, α is U 24with I 1angle, β is U 64with I 5angle.
S5, generates four line phasor graphs according to the phasing degree between described line voltage, described line voltage, described phase current and the phasing degree between described line voltage and phase current.
According to U in specific implementation process 24with I 1, U 64with I 5.between phasing degree draw electric current and voltage four line phasor graph, specifically comprise:
S51, when load is perception, phasor exists right side; When load is capacitive, ? with between the angle of phasor;
S52, rotates four line phasor graphs, makes respectively with the comparison of voltage phasor motherboard hexagonal phase spirogram to obtain actual phase;
S53, according to the angle between described line voltage and phase current, obtains correct phase;
Described for phase current phasor, for reverse phasor, for line voltage phasor.
S6, determines the mode of connection of described three-phase-three-wire energy measurement device according to described four alignment spirograms.
By way of example, according to the method for calling the data measured together and specifically judge the phase three-wire three measuring apparatus mode of connection, if table 1 is for calling the parameter information of the one group of phase three-wire three measuring apparatus measured together.
Table 1
By calling survey data together in table 1: Φ u=60 °, known therefore, TV transformer polarity is for just to connect, and as shown in Figure 2, wherein Fig. 2 a is voltage positive phase sequence schematic diagram for voltage positive phase sequence and negative phase sequence, and Fig. 2 b is voltage negative phase sequence schematic diagram.
If 2 ﹑ 4 ﹑ 6 end phase sequences are reverse sequence, then 2 ﹑ 4 ﹑ 6 end phase sequence situations can be ACB or BAC or CBA, 0≤Φ again u≤ 180 °, then ? rotate clockwise Φ uposition; If 2 ﹑ 4 ﹑ 6 end phase sequences are forward sequence, then 2 ﹑ 4 ﹑ 6 end phase sequence situations can be ABC or BCA or CAB, 180 °≤Φ again u≤ 360 °, then ? rotate clockwise Φ uposition.No matter be positive phase sequence or negative phase sequence, first determine position, then basis determine
Foundation with angle, with angle, draw four line phasor graphs, also draw simultaneously reverse phasor.Rotate four line phasor graphs, until electric current is on the tram of electric current phasor figure, then this four lines phasor graph is field wiring phasor graph.
(1) if when load is perception, as shown in Figure 3, for determining the position of electric current phasor, draw quad conjunction phasor graph according to calling the data measured together, the quad that turns clockwise closes phasor in electric current phasor position, until correspondence with four phasors are just in time on the tram of four line phasor graphs, as shown in Figure 5, reverse phasor with all U athe right.Obviously for for for for then the field wiring mode of phase three-wire three measuring apparatus as shown in Figure 6.
(2) if load is perception, but TV transformer polarity connects instead.Then electric current phasor position is as shown in Figure 3, for determining the position of electric current phasor, draw quad conjunction phasor graph, and then clockwise direction rotates according to calling the data measured together, until correspondence with four phasors are just in time on the tram of four line phasor graphs, as shown in Figure 7, reverse phasor with all U athe right.Obviously for for for for then inductive load polarity of voltage connects anti-phase three-wire three measuring apparatus field wiring mode as shown in Figure 8.
(3) if when load is capacitive, electric current with as shown in Figure 4, for determining the position of electric current phasor, draw quad conjunction phasor graph according to calling the data measured together, the quad that turns clockwise closes phasor in phasor position, until correspondence with four phasors are just in time on the tram of four line phasor graphs, as shown in Figure 9.Obviously be for for for when then load is capacitive, phase three-wire three measuring apparatus field wiring mode as shown in Figure 10.
The detection method of a kind of three-phase-three-wire energy measurement device provided by the invention, by calling relevant information, the data surveying and obtain phase three-wire three measuring apparatus together, draws four line phasor graphs, and and then judges the running status of described three-phase-three-wire energy measurement device.Solve the defects such as large, the measured parameter of on-the-spot test workload that phase three-wire three measuring apparatus on-the-spot test in prior art judges to cause is inaccurate, improve the real-time of measuring apparatus intelligent management, agility, strong intelligent grid is built to State Grid Corporation of China and will produce huge technical support effect.
On the other hand, as shown in figure 11, corresponding the present embodiment additionally provides a kind of pick-up unit of three-phase-three-wire energy measurement device, and described device comprises:
Calling together and survey module 101, surveying phasing degree between ammeter status word, line voltage, line voltage, phase current, phasing degree between line voltage and phase current and total active power for calling together; Described ammeter status word comprises voltage phase sequence and electric current phase sequence;
First judge module 102, for judging whether described voltage phase sequence is positive phase sequence;
Second judge module 103, for when described voltage phase sequence is positive phase sequence, judges whether described electric current phase sequence is positive phase sequence;
3rd judge module 104, for be positive phase sequence when described voltage phase sequence and described electric current phase sequence is positive phase sequence time, calculate three phases active power sum, and judge whether the difference of described three phases active power sum and described total active power is less than preset value;
Generation module 105, when whether the difference for be negative phase sequence or described electric current phase sequence when described voltage phase sequence be negative phase sequence or described three phases active power sum and described total active power is more than or equal to preset value, generate four line phasor graphs according to the phasing degree between described line voltage, described line voltage, described phase current and the phasing degree between described line voltage and phase current;
Determine mode of connection module 106, for determining the mode of connection of described three-phase-three-wire energy measurement device according to described four alignment spirograms.
Further, described three phases active power sum adopts following formulae discovery:
P 1=U 24I 1cosα+U 64I 5cosβ
Wherein, P 1for three phases active power sum, U 24and U 64for line voltage, I 1and I 5for phase current, α is U 24with I 1angle, β is U 64with I 5angle.
Further, described generation module 105 specifically for:
When load is perception, phasor exists right side; When load is capacitive, ? with between the angle of phasor;
Rotate four line phasor graphs, make respectively with the comparison of voltage phasor motherboard hexagonal phase spirogram to obtain actual phase;
According to the angle between described line voltage and phase current, obtain correct phase;
Described for phase current phasor, for reverse phasor, for line voltage phasor.
The pick-up unit of a kind of three-phase-three-wire energy measurement device provided by the invention, by calling relevant information, the data surveying and obtain phase three-wire three measuring apparatus together, draws four line phasor graphs, and and then judges the running status of described three-phase-three-wire energy measurement device.Solve the defects such as large, the measured parameter of on-the-spot test workload that phase three-wire three measuring apparatus on-the-spot test in prior art judges to cause is inaccurate, improve the real-time of measuring apparatus intelligent management, agility, strong intelligent grid is built to State Grid Corporation of China and will produce huge technical support effect.
Although describe embodiments of the present invention by reference to the accompanying drawings, but those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, such amendment and modification all fall into by within claims limited range.

Claims (6)

1. a detection method for three-phase-three-wire energy measurement device, is characterized in that, described method comprises:
S1, call together survey described three-phase-three-wire energy measurement device status word, line voltage, phasing degree between line voltage, phase current, phasing degree between line voltage and phase current and total active power; Described ammeter status word comprises voltage phase sequence and electric current phase sequence;
S2, judges whether described voltage phase sequence is positive phase sequence, if described voltage phase sequence is positive phase sequence, performs step S3, if described voltage phase sequence is negative phase sequence, performs step S5;
S3, judges whether described electric current phase sequence is positive phase sequence, if described electric current phase sequence is positive phase sequence, performs step S4, if described electric current phase sequence is negative phase sequence, performs step S5;
S4, calculate three phases active power sum, and judge whether the difference of described three phases active power sum and described total active power is less than preset value, if described difference is less than described preset value, process ends, if described difference is more than or equal to described preset value, performs step S5;
S5, generates four line phasor graphs according to the phasing degree between described line voltage, described line voltage, described phase current and the phasing degree between described line voltage and phase current;
S6, determines the mode of connection of described three-phase-three-wire energy measurement device according to described four alignment spirograms.
2. method according to claim 1, is characterized in that, described three phases active power sum adopts following formulae discovery:
P 1=U 24I 1cosα+U 64I 5cosβ
Wherein, P 1for three phases active power sum, U 24and U 64for line voltage, I 1and I 5for phase current, α is U 24with I 1angle, β is U 64with I 5angle.
3. method according to claim 1, is characterized in that, described step S5 specifically comprises:
S51, when load is perception, phasor exists right side; When load is capacitive, ? with between the angle of phasor;
S52, rotates four line phasor graphs, makes respectively with the comparison of voltage phasor motherboard hexagonal phase spirogram to obtain actual phase;
S53, according to the angle between described line voltage and phase current, obtains correct phase;
Described for phase current phasor, for reverse phasor, for line voltage phasor.
4. a pick-up unit for three-phase-three-wire energy measurement device, is characterized in that, described device comprises:
Calling survey module together, surveying phasing degree between ammeter status word, line voltage, line voltage, phase current, phasing degree between line voltage and phase current and total active power for calling together; Described ammeter status word comprises voltage phase sequence and electric current phase sequence;
First judge module, for judging whether described voltage phase sequence is positive phase sequence;
Second judge module, for when described voltage phase sequence is positive phase sequence, judges whether described electric current phase sequence is positive phase sequence;
3rd judge module, for be positive phase sequence when described voltage phase sequence and described electric current phase sequence is positive phase sequence time, calculate three phases active power sum, and judge whether the difference of described three phases active power sum and described total active power is less than preset value;
Generation module, when whether the difference for be negative phase sequence or described electric current phase sequence when described voltage phase sequence be negative phase sequence or described three phases active power sum and described total active power is more than or equal to preset value, generate four line phasor graphs according to the phasing degree between described line voltage, described line voltage, described phase current and the phasing degree between described line voltage and phase current;
Determine mode of connection module, for determining the mode of connection of described three-phase-three-wire energy measurement device according to described four alignment spirograms.
5. device according to claim 4, is characterized in that, described three phases active power sum adopts following formulae discovery:
P 1=U 24I 1cosα+U 64I 5cosβ
Wherein, P 1for three phases active power sum, U 24and U 64for line voltage, I 1and I 5for phase current, α is U 24with I 1angle, β is U 64with I 5angle.
6. device according to claim 4, is characterized in that, described generation module specifically for:
When load is perception, phasor exists right side; When load is capacitive, ? with between the angle of phasor;
Rotate four line phasor graphs, make respectively with the comparison of voltage phasor motherboard hexagonal phase spirogram to obtain actual phase;
According to the angle between described line voltage and phase current, obtain correct phase;
Described for phase current phasor, for reverse phasor, for line voltage phasor.
CN201410829838.1A 2014-12-26 2014-12-26 Method and device for detecting three-phase three-wire energy measurement device CN104459603A (en)

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CN106443313A (en) * 2016-09-29 2017-02-22 国网四川省电力公司电力科学研究院 Rapid detection method for false wiring of high-voltage three-phase three-wire electric energy metering device
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CN108445438A (en) * 2018-03-23 2018-08-24 国网河北省电力有限公司电力科学研究院 The detection method and device of false wiring of electric energy metering equipment
CN109142960A (en) * 2018-08-08 2019-01-04 国网重庆市电力公司电力科学研究院 A kind of online discriminating method of phase three-wire three metering device false wiring and system
CN109142829A (en) * 2018-08-08 2019-01-04 国网重庆市电力公司电力科学研究院 A kind of online discriminating method of three-phase and four-line metering device false wiring and system
CN109193563A (en) * 2018-09-18 2019-01-11 深圳供电局有限公司 Defluidization fault monitoring method and device based on phase three-wire three meter equipment
CN109193563B (en) * 2018-09-18 2020-09-11 深圳供电局有限公司 Current loss fault monitoring method and device based on three-phase three-wire meter equipment

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