CN104502736A - Online phase sequence self-adapting method - Google Patents
Online phase sequence self-adapting method Download PDFInfo
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- CN104502736A CN104502736A CN201510010955.XA CN201510010955A CN104502736A CN 104502736 A CN104502736 A CN 104502736A CN 201510010955 A CN201510010955 A CN 201510010955A CN 104502736 A CN104502736 A CN 104502736A
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Abstract
The invention provides an online phase sequence self-adapting method. The method includes judging whether wiring is normal by judging whether input phase angle difference of a power measurement analysis device exceeds the range and automatically adjusting the equipment wiring mode according to the current phase sequence judging result. By means of the method, a large amount of earlier commissioning work can be reduced, the work load is saved, the wiring phase can still be adjusted under the condition that the power is on even if a user performs electrification, the equipment works normally, and power disconnection and restarting are not necessary.
Description
Technical field
The invention belongs to power measurement and analysis field, particularly relate to a kind of online phase sequence self-adaption method.
Background technology
At power measurement and analysis field, before carrying out measuring or analyzing, first need electric power signal to access power measurement analytical equipment.Many circuit access power measurement analytical equipments are had in three-phase electrical power system, prior art is the electric power signal one_to_one corresponding of power measurement analytical equipment port and access, namely vA port voltage signal Va being accessed power measurement analytical equipment is needed, voltage signal Vb accesses the vB port etc. of power measurement analytical equipment, and power measurement analytical equipment can provide normal Measurement and analysis result.And consequent two problems is: the first, working-yard is complicated, and cable is numerous, and port wiring one to one can bring more workload.The second, due to workmen's carelessness, cause wiring incorrect, and a lot of scene does not allow power-off after powering on, or power-off can bring massive losses, causes equipment normally to work, measure and analyze error in data, even bringing potential safety hazard into.Must ensure that each port wiring of each power measurement analytical equipment is correct, be the work of a superfine heart at Large Field, also need repeated inspection to debug.
Do not allowing the scene of power-off, wrong line will cause power measurement analytical equipment normally to work, and the result of Measurement and analysis is incorrect, even brings potential safety hazard.
Summary of the invention
For when power measurement analyzes field wiring, the work considering phase sequence order is reduced to site operation personnel, accelerating construction progress, overcome when the actual phase sequence accessed requires different from power measurement analytical equipment, power measurement analytical equipment, can not the correct wiring of display device and physical cabling situation without active prompt facility; And power measurement analytical equipment cannot adjust the mode of connection automatically to adapt to actual phase sequence and cannot realize phase sequence self-adaption when not power-off.The present invention proposes a kind of online phase sequence self-adaption method.
A kind of online phase sequence self-adaption method of electric power signal that the present invention proposes, mainly comprises the following steps:
The first step, to input to power measurement analytical equipment three-phase alternating current A phase voltage input port vA, three-phase alternating current B phase voltage input port vB, three-phase alternating current C phase voltage input port vC, three-phase alternating current A phase current input port iA, three-phase alternating current B phase current input port iB and three-phase alternating current C phase current input port iC signal process, reach a suitable available scope to make original signal;
Second step, carries out analog to digital conversion to the signal after process, by result after conversion successively stored in the first memory RAM1 in power measurement analytical equipment;
3rd step, the signal inputing to each port of power measurement analytical equipment is analyzed, draws three-phase alternating current A phase voltage input port vA, three-phase alternating current B phase voltage input port vB, three-phase alternating current C phase voltage input port vC, the initial phase angle of three-phase alternating current A phase current input port iA, three-phase alternating current B phase current input port iB and three-phase alternating current C phase input port iC port signal is Φ va, Φ vb, Φ vc, Φ ia, Φ ib, Φ ic;
4th step, calculate the phase angle difference Φ vab of described A phase voltage input port vA and described B phase voltage input port vB, the phase angle difference Φ vbc of described B phase voltage input port vB and described C phase voltage input port vC, the phase angle difference Φ vca of described C phase voltage input port vC and described A phase voltage input port vA, phase angle difference Φ iab between described A phase current input port and described B phase current input port, phase angle difference Φ ibc between described B phase current input port and described C phase current input port, phase angle difference Φ ica between described C phase current input port and described A phase current input port, described A phase voltage input port vA and described A phase current input port angle Φ via, described B phase voltage input port vA and described B phase current input port angle Φ vib and described C phase voltage input port vA and described C phase current input port angle Φ vic,
5th step, Φ vab, Φ vbc, Φ vca, Φ iab, Φ ibc, Φ ica, Φ via, Φ vib, Φ vic value are expressed as successively 120 ° ± e1,120 ° ± e2,120 ° ± e3,120 ° ± e4,120 ° ± e5,120 ° ± e6,0 ° ± e7,0 ° ± e8,0 ° ± e9, wherein, e1, e2, e3, e4, e5, e6, the value of e7, e8, e9 is separate;
6th step, by judging e1, the value of e2, e3, e4, e5, e6, e7, e8, e9, combination judges whether each input port wiring of power measurement analytical equipment makes mistakes;
7th step, if there is wiring error in the 6th step, by the correspondence mappings relation in the first random access memory ram 1 in change power measurement analytical equipment and the second random access memory ram 2, realize the online phase sequence self-adaption of electric power signal, thus guarantee that power measurement analytical equipment exports correct electric power signal.
Accompanying drawing explanation
Fig. 1 is the power measurement analytical equipment structural drawing according to the embodiment of the present invention.
Va: power measurement analytical equipment three-phase alternating current A phase voltage output port;
Vb: power measurement analytical equipment three-phase alternating current B phase voltage output port;
Vc: power measurement analytical equipment three-phase alternating current C phase voltage output port;
Vn: power measurement analytical equipment three-phase alternating current electric neutrality output voltage terminal mouth;
Ia: power measurement analytical equipment three-phase alternating current A phase current output port;
Ib: power measurement analytical equipment three-phase alternating current B phase current output port;
Ic: power measurement analytical equipment three-phase alternating current C phase current output port;
VA: the three-phase alternating current A phase voltage input port of power measurement analytical equipment acquiescence;
VB: the three-phase alternating current B phase voltage input port of power measurement analytical equipment acquiescence;
VC: the three-phase alternating current C phase voltage input port of power measurement analytical equipment acquiescence;
VN: the three-phase alternating current electrical neutral axis input port of power measurement analytical equipment acquiescence;
IA: the three-phase alternating current A phase current input port of power measurement analytical equipment acquiescence;
IB: the three-phase alternating current B phase current input port of power measurement analytical equipment acquiescence;
IC: the three-phase alternating current C phase current input port of power measurement analytical equipment acquiescence.
Embodiment
Below in conjunction with accompanying drawing, also by best embodiment, the present invention is described in detail.
With reference to accompanying drawing 1, this power measurement analytical equipment comprises Signal-regulated kinase, analog-to-digital conversion module, and the first random access memory ram 1, second random access memory ram 2, obtains current phase sequence module, phase sequence reminding module and phase sequence adjusting module.Wherein Signal-regulated kinase is used for amplifying the electric power signal of input, impedance matching, the process such as filtering, analog-to-digital conversion module is used for carrying out analog to digital conversion to electric power signal after treatment, first random access memory ram 1 is for storing the electric power signal after analog to digital conversion, second random access memory ram 2 is for setting up corresponding storage relation with first memory RAM1, with output power signal, obtain current phase sequence module for obtaining the phase sequence of the electric power signal inputing to power measurement analytical equipment, the Wiring port given tacit consent to for the electric power signal that judges to input to power measurement analytical equipment and this equipment of phase sequence reminding module whether mate by phase sequence, phase sequence adjusting module is used under phase sequence reminding module judges the unmatched situation of phase sequence, adjust the correspondence mappings relation of the second random access memory ram 2 and the first random access memory ram 1.When phase sequence is mated, memory address Sr1 in first random access memory ram 1 is corresponding with A phase current memory address Ia in the second random access memory ram 2, memory address Sr2 in first random access memory ram 1 is corresponding with B phase current memory address Ib in the second random access memory ram 2, memory address Sr3 in first random access memory ram 1 is corresponding with C phase current memory address Ic in the second random access memory ram 2, memory address Sr4 in first random access memory ram 1 is corresponding with A phase voltage memory address Va in the second random access memory ram 2, memory address Sr5 in first random access memory ram 1 is corresponding with B phase voltage memory address Vb in the second random access memory ram 2, memory address Sr6 in first random access memory ram 1 is corresponding with C phase voltage memory address Ic in the second random access memory ram 2.
The one online electric power signal phase sequence self-adaption method that the present invention proposes, mainly comprises the following steps:
The first step, to inputing to power measurement analytical equipment vA, the signal of vB, vC, iA, iB, iC port amplifies, impedance matching, and the process such as filtering, reach a suitable available scope to make original signal; Wherein suitable usable range is general knowledge known in this field, and general after process, the value inputing to vA, vB, vC port is taken as 2.5v.
Second step, carries out analog to digital conversion to the signal after process, and after changing, result is successively stored in the first random access memory ram 1.
3rd step, analyzes the signal inputing to each input port of power measurement analytical equipment, show that the initial phase angle of vA, vB, vC, iA, iB, iC port signal is Φ va, Φ vb, Φ vc, Φ ia, Φ ib, Φ ic.
4th step, can calculate voltage port phase angle difference is thus Φ vab, Φ vbc, Φ vca, between electric current port, phase angle difference is: Φ iab, Φ ibc, Φ ica, electric current and voltage angle is Φ via, Φ vib, Φ vic, wherein Φ vab, Φ vbc, Φ vca are the phase angle difference of vA and vB port respectively, the phase angle difference of vB and vC port, the phase angle difference of vC and vA port; Φ iab, Φ ibc, Φ ica are the phase angle difference of iA and iB port respectively, the phase angle difference of iB and iC port, the phase angle difference of iC and iA port; Φ via, Φ vib, Φ vic are the phase angle difference of vA and iA port respectively, the phase angle difference of vB and iB port, the phase angle difference of vC and iC port.
5th step, Φ vab, Φ vbc, Φ vca, Φ iab, Φ ibc, Φ ica, Φ via, Φ vib, Φ vic value are expressed as successively 120 ° ± e1,120 ° ± e2,120 ° ± e3,120 ° ± e4,120 ° ± e5,120 ° ± e6,0 ° ± e7,0 ° ± e8,0 ° ± e9.Wherein, e1, e2 ... the value of e7, e8, e9 is separate.Due to when circuit exists load, also certain phase angle difference can be there is between in-phase voltage and electric current, therefore e1, e2, the concrete numerical value of e7, e8, e9 could need be obtained by test, generally, e1, e2 ... e7, e8, e9 in [-15 ° ,+15 °] interval appoint get a numerical value, in the normal situation of equipment wiring, e1, e2, the value of e7, e8, e9 levels off to zero.Below set x=15 °.
By combination, 6th step, judges whether each port connection of electric power signal and its that power measurement analytical equipment inputs mates, concrete decision method following (set the corresponding Va of vA port, and correct phase sequence being A-B-C):
The first, judge voltage phase sequence:
1, work as e1
(-x ,+x) and e2
time (-x ,+x), show the voltage signal three-phase homophase that power measurement analytical equipment inputs, phase sequence is abnormal;
2, as e1 ∈ (-x ,+x) and e2
time (-x ,+x), show the voltage signal homophase of power measurement analytical equipment vA and the input of vB two-port, phase sequence is abnormal;
3, as e2 ∈ (-x ,+x) and e3
time (-x ,+x), show the voltage signal homophase of power measurement analytical equipment vB and the input of vC two-port, phase sequence is abnormal;
4, as e3 ∈ (-x ,+x) and e1
time (-x ,+x), show the voltage signal homophase of power measurement analytical equipment vC and the input of vA two-port, phase sequence is abnormal;
5, work as e1
(-x ,+x) and e2
(-x ,+x) and e3
time (-x ,+x), show that the voltage signal three-phase phase-sequence that power measurement analytical equipment inputs is contrary, phase sequence is abnormal;
6, as e1 ∈ (-x ,+x) and e2 ∈ (-x ,+x) and e3 ∈ (-x ,+x) time, show that the voltage signal three-phase phase-sequence that power measurement analytical equipment inputs is normal.
By the span of above e1, e2, e3 value, actual phase sequence situation can be determined.
The second, judge electric current phase sequence:
1, as e7 ∈ (-x ,+x), show that the actual input of power measurement analytical equipment A phase current input port is correct;
2, as e7 ∈ ((-x ,+x)+180 °), show that power measurement analytical equipment A phase current input port is actual and be input as A phase negative-phase sequence curent;
3, as e7 ∈ ((-x ,+x)+120 °), show that power measurement analytical equipment A phase current input port is actual and be input as B phase current;
4, as e7 ∈ ((-x ,+x)+300 °), show that power measurement analytical equipment A phase current input port is actual and be input as B phase negative-phase sequence curent;
5, as e7 ∈ ((-x ,+x)+240 °), show that power measurement analytical equipment A phase current input port is actual and be input as C phase current;
6, as e7 ∈ ((-x ,+x)+60 °), show that power measurement analytical equipment A phase current input port is actual in being input as C phase negative-phase sequence curent;
7, as e8 ∈ (-x ,+x), show that the actual input of power measurement analytical equipment B phase current input port is correct; ;
8, as e8 ∈ ((-x ,+x)+180 °), show that power measurement analytical equipment B phase current input port is actual and be input as B phase negative-phase sequence curent;
9, as e8 ∈ ((-x ,+x)+120 °), show that power measurement analytical equipment B phase current input port is actual and be input as C phase current;
10, as e8 ∈ ((-x ,+x)+300 °), show that power measurement analytical equipment B phase current input port is actual in being input as C phase negative-phase sequence curent;
11, as e8 ∈ ((-x ,+x)+240 °), show that power measurement analytical equipment B phase current input port is actual and be input as A phase current;
12, as e8 ∈ ((-x ,+x)+60 °), show that power measurement analytical equipment B phase current input port is actual in being input as A phase negative-phase sequence curent;
13, as e9 ∈ (-x ,+x), show that the actual input of power measurement analytical equipment C phase current input port is correct; ;
14, as e9 ∈ ((-x ,+x)+180 °), show that power measurement analytical equipment C phase current input port is actual and be input as C phase negative-phase sequence curent;
15, as e9 ∈ ((-x ,+x)+120 °), show that power measurement analytical equipment C phase current input port is actual and be input as A phase current;
16, as e9 ∈ ((-x ,+x)+300 °), show that power measurement analytical equipment C phase current input port is actual in being input as A phase negative-phase sequence curent;
17, as e9 ∈ ((-x ,+x)+240 °), show that power measurement analytical equipment C phase current input port is actual and be input as B phase current;
18, as e9 ∈ ((-x ,+x)+60 °), show that power measurement analytical equipment C phase current input port is actual in being input as B phase negative-phase sequence curent.
When voltage phase sequence is correct, by the actual phase sequence can determining electric current above.
3rd, checking:
If e4 is ∈ (-x ,+x) and e5 ∈ (-x ,+x) and e6 ∈ (-x ,+x) shows that three-phase phase-sequence is normal.
7th step, in judging at voltage phase sequence, the abnormal situation of phase sequence of appearance, by adjusting the correspondence mappings relation between the first random access memory ram 1 and the second random access memory ram 2, realizes online phase sequence correction.For above-mentioned phase sequence situation, concrete correction is as follows:
For the 1 to 4 judged result of above-mentioned " voltage phase sequence ", owing to can not there is the situation that any two ports access two phase inphase angle pressure-wires at vA, vB, vC port of power measurement analytical equipment, therefore, for the judged result of above-mentioned 1 to 4, this method does not carry out phase sequence correction, and for above-mentioned 6th judged result, because pressure-wire accesses entirely true, therefore also without the need to carrying out phase sequence correction.
For above-mentioned 5th judged result, only need in the mapping of the second memory RAM 2 and first memory RAM 1 immediately immediately, memory address Sr6 in first memory RAM1 is corresponding with the address storing Vc in second memory RAM2, and the memory address Sr5 in first memory RAM1 is corresponding with the address storing Vb in second memory RAM2.And, because Va, Vb, Vc phasing degree all differs 120 ° between two, therefore, if there is the judged result of the 5th, as long as so meet the one in following three kinds of situations, namely address Sr4, Sr5, Sr6 in the first random access memory ram 1 correspond to for storing the address of Va, Vb, Vc in the second random access memory ram 2, or correspond to the address storing Vb, Vc, Va, also or correspond to the address storing Vc, Va, Vb.
For in electric current judging phase order, the abnormal situation of phase sequence of appearance, by adjusting the correspondence mappings relation between the first random access memory ram 1 and the second random access memory ram 2, realizes online phase sequence correction.For above-mentioned phase sequence situation, concrete correction is as follows:
1, A phase current is correctly pointed out, and in maintenance RAM1, in A phase current signal address Sr1 and RAM2, A phase current signal address Ia is corresponding;
2, in maintenance RAM1, A phase current signal address Sr1 assignment is to A phase current signal address Ia in RAM2, and A phase current signal is overturn 180 °;
3, by A phase current signal address Sr1 assignment in RAM1 to B phase current signal address Ib in RAM2;
4, by A phase current signal address Sr1 assignment in RAM1 to B phase current signal address Ib in RAM2, and B phase current signal is overturn 180 °;
5, by A phase current signal address Sr1 assignment in RAM1 to C phase current signal address Ic in RAM2;
6, by A phase current signal address Sr1 assignment in RAM1 to C phase current signal address Ic in RAM2, and C phase current signal is overturn 180 °;
7, B phase current is correctly pointed out, and in maintenance RAM1, B phase current signal address Sr2 assignment is to B phase current signal address Ib in RAM2;
8, in maintenance RAM1, B phase current signal address Sr2 assignment is to B phase current signal address Ib in RAM2, and B phase current signal is overturn 180 °;
9, by B phase current signal address Sr2 assignment in RAM1 to C phase current signal address Ic in RAM2;
10, by B phase current signal address Sr2 assignment in RAM1 to C phase current signal address Ic in RAM2, and C phase current signal is overturn 180 °;
11, by B phase current signal address Sr2 assignment in RAM1 to A phase current signal address Ia in RAM2;
12, by B phase current signal address Sr2 assignment in RAM1 to A phase current signal address Ia in RAM2, and A phase current signal is overturn 180 °;
13, C phase current is correctly pointed out, and in maintenance RAM1, C phase current signal address Sr3 assignment is to C phase current signal address Ia in RAM2;
14, in maintenance RAM1, C phase current signal address Sr3 assignment is to C phase current signal address Ic in RAM2, and C phase current signal is overturn 180 °;
15, by C phase current signal address Sr3 assignment in RAM1 to A phase current signal address Ia in RAM2;
16, by C phase current signal address Sr3 assignment in RAM1 to A phase current signal address Ia in RAM2, and A phase current signal overturns 180 °;
17, by C phase current signal address Sr3 assignment in RAM1 to B phase current signal address Ib in RAM2;
18, by C phase current signal address Sr3 assignment in RAM1 to B phase current signal address Ib in RAM2, and B phase current signal overturns 180 °;
Whole phase sequence calculates and revises and completes by software, all completes under not powering-off state, realizes online phase sequence correction.
The present invention, when powering on debugging, initiatively can show current phase sequence situation, when wiring error, can initiatively point out current phase sequence, and provide warning message.
Obtaining after user allows authority, automatically to realize phase sequence and adapting to.In earlier stage a large amount of debugging efforts can be reduced with this, save workload, even if after user powers on, still can adjust wiring phase sequence in the situation of not power-off, ensure that equipment is working properly, and need not power-off restarting.
Equipment in normal operation, pass through running software, complete voltage phase sequence, the computing of electric current phase sequence and judgement, pass through judged result, corresponding to the wiring situation of equipment vA, vB, vC, iA, iB, iC port, by data source in RAM1 (judged result, signal waveform etc.) accordingly assignment in RAM2, thus just can be demonstrated the numerical value, signal waveform etc. of each correct voltage and current by data in RAM2.
In the present invention, the phase angle measuring each voltage and current signal can use multiple applications, comprises and well known to a person skilled in the art Fourier's analysis method, hardware compares, the method such as comparison, zero passage detection.
Above embodiment is the one of the present invention's more preferably embodiment, and the usual change that those skilled in the art carry out within the scope of the technical program and replacing should be included in protection scope of the present invention.
Claims (4)
1. the online phase sequence self-adaption method of electric power signal, mainly comprises the following steps:
The first step, to input to power measurement analytical equipment three-phase alternating current A phase voltage input port vA, three-phase alternating current B phase voltage input port vB, three-phase alternating current C phase voltage input port vC, three-phase alternating current A phase current input port iA, three-phase alternating current B phase current input port iB and three-phase alternating current C phase current input port iC signal process, reach a suitable available scope to make original signal;
Second step, carries out analog to digital conversion to the signal after process, by result after conversion successively stored in the first memory RAM1 in power measurement analytical equipment;
3rd step, the signal inputing to each port of power measurement analytical equipment is analyzed, draws three-phase alternating current A phase voltage input port vA, three-phase alternating current B phase voltage input port vB, three-phase alternating current C phase voltage input port vC, the initial phase angle of three-phase alternating current A phase current input port iA, three-phase alternating current B phase current input port iB and three-phase alternating current C phase input port iC port signal is Φ va, Φ vb, Φ vc, Φ ia, Φ ib, Φ ic;
4th step, calculate the phase angle difference Φ vab of described A phase voltage input port vA and described B phase voltage input port vB, the phase angle difference Φ vbc of described B phase voltage input port vB and described C phase voltage input port vC, the phase angle difference Φ vca of described C phase voltage input port vC and described A phase voltage input port vA, phase angle difference Φ iab between described A phase current input port and described B phase current input port, phase angle difference Φ ibc between described B phase current input port and described C phase current input port, phase angle difference Φ ica between described C phase current input port and described A phase current input port, described A phase voltage input port vA and described A phase current input port angle Φ via, described B phase voltage input port vB and described B phase current input port angle Φ vib and described C phase voltage input port vC and described C phase current input port angle Φ vic,
5th step, Φ vab, Φ vbc, Φ vca, Φ iab, Φ ibc, Φ ica, Φ via, Φ vib, Φ vic value are expressed as successively 120 ° ± e1,120 ° ± e2,120 ° ± e3,120 ° ± e4,120 ° ± e5,120 ° ± e6,0 ° ± e7,0 ° ± e8,0 ° ± e9, wherein, e1, e2, e3, e4, e5, e6, the value of e7, e8, e9 is separate;
6th step, by judging e1, the value of e2, e3, e4, e5, e6, e7, e8, e9, combination judges whether each input port wiring of power measurement analytical equipment makes mistakes;
7th step, if there is wiring error in the 6th step, by the correspondence mappings relation in the first random access memory ram 1 in change power measurement analytical equipment and the second random access memory ram 2, realize the online phase sequence self-adaption of electric power signal, thus guarantee that power measurement analytical equipment exports correct electric power signal.
2. the online phase sequence self-adaption method of electric power signal as claimed in claim 1, wherein in described 6th step, comprises the following steps:
Step one, judges whether the wiring of power measurement analytical equipment voltage input end mouth makes mistakes, and it comprises following situation:
(1) e1 is worked as
(-x ,+x) and e2
time (-x ,+x), show the voltage signal three-phase homophase that power measurement analytical equipment inputs, phase sequence is abnormal;
(2) as e1 ∈ (-x ,+x) and e2
time (-x ,+x), show the voltage signal homophase of power measurement analytical equipment vA and the input of vB two-port, phase sequence is abnormal;
(3) as e2 ∈ (-x ,+x) and e3
time (-x ,+x), show the voltage signal homophase of power measurement analytical equipment vB and the input of vC two-port, phase sequence is abnormal;
(4) as e3 ∈ (-x ,+x) and e1
time (-x ,+x), show the voltage signal homophase of power measurement analytical equipment vC and the input of vA two-port, phase sequence is abnormal;
(5) e1 is worked as
(-x ,+x) and e2
(-x ,+x) and e3
time (-x ,+x), show that the voltage signal three-phase phase-sequence that power measurement analytical equipment inputs is contrary, phase sequence is abnormal;
(6) as e1 ∈ (-x ,+x) and e2 ∈ (-x ,+x) and e3 ∈ (-x ,+x) time, show that the voltage signal three-phase phase-sequence that power measurement analytical equipment inputs is normal;
Step 2, when voltage phase sequence is correct, judges whether the wiring of power measurement analytical equipment current input terminal mouth makes mistakes, and it comprises following situation:
(1) as e7 ∈ (-x ,+x), show that the actual input of power measurement analytical equipment A phase current input port is correct;
(2) as e7 ∈ ((-x ,+x)+180 °), show that power measurement analytical equipment A phase current input port is actual and be input as A phase negative-phase sequence curent;
(3) as e7 ∈ ((-x ,+x)+120 °), show that power measurement analytical equipment A phase current input port is actual and be input as B phase current;
(4) as e7 ∈ ((-x ,+x)+300 °), show that power measurement analytical equipment A phase current input port is actual and be input as B phase negative-phase sequence curent;
(5) as e7 ∈ ((-x ,+x)+240 °), show that power measurement analytical equipment A phase current input port is actual and be input as C phase current;
(6) as e7 ∈ ((-x ,+x)+60 °), show that power measurement analytical equipment A phase current input port is actual in being input as C phase negative-phase sequence curent;
(7) as e8 ∈ (-x ,+x), show that the actual input of power measurement analytical equipment B phase current input port is correct;
(8) as e8 ∈ ((-x ,+x)+180 °), show that power measurement analytical equipment B phase current input port is actual and be input as B phase negative-phase sequence curent;
(9) as e8 ∈ ((-x ,+x)+120 °), show that power measurement analytical equipment B phase current input port is actual and be input as C phase current;
(10) as e8 ∈ ((-x ,+x)+300 °), show that power measurement analytical equipment B phase current input port is actual in being input as C phase negative-phase sequence curent;
(11) as e8 ∈ ((-x ,+x)+240 °), show that power measurement analytical equipment B phase current input port is actual and be input as A phase current;
(12) as e8 ∈ ((-x ,+x)+60 °), show that power measurement analytical equipment B phase current input port is actual in being input as A phase negative-phase sequence curent;
(13) as e9 ∈ (-x ,+x), show that the actual input of power measurement analytical equipment C phase current input port is correct;
(14) as e9 ∈ ((-x ,+x)+180 °), show that power measurement analytical equipment C phase current input port is actual and be input as C phase negative-phase sequence curent;
(15) as e9 ∈ ((-x ,+x)+120 °), show that power measurement analytical equipment C phase current input port is actual and be input as A phase current;
(16) as e9 ∈ ((-x ,+x)+300 °), show that power measurement analytical equipment C phase current input port is actual in being input as A phase negative-phase sequence curent;
(17) as e9 ∈ ((-x ,+x)+240 °), show that power measurement analytical equipment C phase current input port is actual and be input as B phase current;
(18) as e9 ∈ ((-x ,+x)+60 °), show that power measurement analytical equipment C phase current input port is actual in being input as B phase negative-phase sequence curent;
Step 3, whether the wiring of checking power measurement analytical equipment voltage and current input port is normal;
If e4 is ∈ (-x ,+x) and e5 ∈ (-x ,+x) and e6 ∈ (-x ,+x) shows that three-phase phase-sequence is normal.
3. the online phase sequence self-adaption method of electric power signal as claimed in claim 2, wherein x value is 15 °.
4. the online phase sequence self-adaption method of electric power signal as claimed in claim 2, for situation (the 1)-situation (18) of power measurement analytical equipment current input terminal mouth wiring in step 2, by adjusting the correspondence mappings relation between the first random access memory ram 1 and the second random access memory ram 2, realize online phase sequence correction, concrete correction is as follows:
(1) A phase current is correctly pointed out, and in maintenance RAM1, in A phase current signal address Sr1 and RAM2, A phase current signal address Ia is corresponding;
(2) to keep in RAM1 A phase current signal address Sr1 assignment to A phase current signal address Ia in RAM2, and A phase current signal is overturn 180 °;
(3) by A phase current signal address Sr1 assignment in RAM1 to B phase current signal address Ib in RAM2;
(4) by A phase current signal address Sr1 assignment in RAM1 to B phase current signal address Ib in RAM2, and B phase current signal is overturn 180 °;
(5) by A phase current signal address Sr1 assignment in RAM1 to C phase current signal address Ic in RAM2;
(6) by A phase current signal address Sr1 assignment in RAM1 to C phase current signal address Ic in RAM2, and C phase current signal is overturn 180 °;
(7) B phase current is correctly pointed out, and in maintenance RAM1, B phase current signal address Sr2 assignment is to B phase current signal address Ib in RAM2;
(8) to keep in RAM1 B phase current signal address Sr2 assignment to B phase current signal address Ib in RAM2, and B phase current signal is overturn 180 °;
(9) by B phase current signal address Sr2 assignment in RAM1 to C phase current signal address Ic in RAM2;
(10) by B phase current signal address Sr2 assignment in RAM1 to C phase current signal address Ic in RAM2, and C phase current signal is overturn 180 °;
(11) by B phase current signal address Sr2 assignment in RAM1 to A phase current signal address Ia in RAM2;
(12) by B phase current signal address Sr2 assignment in RAM1 to A phase current signal address Ia in RAM2, and A phase current signal is overturn 180 °;
(13) C phase current is correctly pointed out, and in maintenance RAM1, C phase current signal address Sr3 assignment is to C phase current signal address Ia in RAM2;
(14) to keep in RAM1 C phase current signal address Sr3 assignment to C phase current signal address Ic in RAM2, and C phase current signal is overturn 180 °;
(15) by C phase current signal address Sr3 assignment in RAM1 to A phase current signal address Ia in RAM2;
(16) by C phase current signal address Sr3 assignment in RAM1 to A phase current signal address Ia in RAM2, and A phase current signal overturns 180 °;
(17) by C phase current signal address Sr3 assignment in RAM1 to B phase current signal address Ib in RAM2;
(18) by C phase current signal address Sr3 assignment in RAM1 to B phase current signal address Ib in RAM2, and B phase current signal overturns 180 °.
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| CN111913051A (en) * | 2020-05-25 | 2020-11-10 | 威胜信息技术股份有限公司 | Method for automatically adjusting phase sequence of power distribution network, monitoring unit and monitoring system |
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