CN105158539A - Circuit for measuring voltage drop of PT secondary circuit on the basis of voltage drop eliminating device - Google Patents
Circuit for measuring voltage drop of PT secondary circuit on the basis of voltage drop eliminating device Download PDFInfo
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Abstract
The invention discloses a circuit for measuring the voltage drop of a PT secondary circuit on the basis of a voltage drop eliminating device. The circuit comprises a PT output end, a PT secondary circuit, the voltage drop eliminating device, an electric energy meter, and an equivalent resistor connected in parallel with the PT output end, wherein the PT output end, the PT secondary circuit, the voltage drop eliminating device, and the electric energy meter are successively connected in series. Two channels are led from the PT output end and the internal input end of the voltage drop eliminating device respectively. One channel is connected with the equivalent resistor through a switch K1. The other channel is successively connected in series with a relay K0, a voltage sampling module, a voltage phase detecting module, and a processor. The internal input end of the voltage drop eliminating device is provided with a switch K2. The internal output end of the voltage drop eliminating device is provided with a switch K3. A bypass is arranged between the switch K2 and the switch K3 and is used for cutting the voltage drop eliminating device and restoring an original PT secondary circuit state.
Description
Technical field
The present invention relates to a kind of industrial electrical field of measuring technique, particularly a kind of circuit and method measuring PT secondary circuit voltage drop based on pressure drop cancellation element.
Background technology
In order to effectively reduce the pressure drop of all kinds of electric power meter PT secondary circuits of regulation in DL/T448-2000 " electric energy measuring management technical management code ", the domestic current device for eliminating PT secondary circuit voltage drop having occurred adopting voltage follower principle to produce.The functional characteristics of voltage follower is that output voltage equals input voltage, does not have phase differential; Input impedance is very large, and follower front end electric current is very little, close to zero; Output impedance is very little, can bringing onto load.
Can ensure PT measuring accuracy again to realize eliminating PT secondary circuit voltage drop, be a kind of effective method in the precision resistance module of PT endpiece parallel connection access and electric energy meter impedance matching simultaneously.The switching while that resistive module and voltage follower module being in PT secondary circuit, formation is accurately eliminated pressure drop, is protected the pressure drop cancellation element function element module of former measurement loop, and the resistance Zx of equivalent resistance meets following formula: Zx=Z+Z
2/ Zin, wherein Z represents electric energy meter impedance, and Zin represents the impedance of voltage follower module input, and electric energy meter is equal in the operation of PT end.
DL/T448 ?define allowed band and the measuring period of all kinds of electric power meter PT secondary circuit voltage drop in 2000 " electric energy measuring management technical management codes ".The special PT secondary circuit voltage drop measuring instrument of domestic production adopts error of measurement method directly to measure or indirect host and slave processors mensuration mostly.
When directly measuring by error of measurement method, staff holds work ticket and carries out surveying work to substation field.Following problem is there is in actual measurement operation:
(1) be manually difficult to continuous coverage, the data measured for analyzing are few, inefficiency.
(2), there is potential safety hazard in the artificial stranded shielded cable of folding and unfolding at the scene of each measurement.
(3) stranded shielded cable must carry out Insulation test before each measurement point measures wiring at every turn.
(4) measure at every turn, be greatly less than the time of field wiring, stranded shielded cable retractable cable, stranded shielded cable Insulation test, defect elimination for measuring the time obtaining data.
(5) major part provides data computing function, needs manually to carry out data analysis.
Solve (2) (3) (4) (5) problem directly measured by error of measurement method with indirect host and slave processors mensuration, but bring new problem in actual measurement work:
(1) radio communication scene is easily disturbed, and staff must find the wireless aerial position that can ensure communication in scene repeatedly; Host and slave processors GPS scene must trace into communications satellite respectively and can measure.
(2) equipment must host and slave processors configuration, main frame as measuring, the measurement of breaking down of the core of data processing cannot complete, equipment guarantee is not high;
(3) because host and slave processors is supporting, equipment repeats to purchase.
No matter directly measure by error of measurement method or measure PT secondary circuit voltage drop with indirect host and slave processors mensuration, staff must hold work ticket, take measure equipment, the substation field that rides public transportation means carries out surveying work, road, work on the spot time are longer, and job costs are higher.
Summary of the invention
Goal of the invention: technical matters to be solved by this invention is for the deficiencies in the prior art, provides a kind of circuit and the method for measuring PT secondary circuit voltage drop based on pressure drop cancellation element.
In order to solve the problems of the technologies described above, the invention discloses a kind of circuit measuring PT secondary circuit voltage drop based on pressure drop cancellation element, comprise be connected in series successively PT output terminal, PT secondary circuit, pressure drop cancellation element, electric energy meter and and be connected in the equivalent resistance of PT output terminal, draw two-way respectively at the inner input end of PT output terminal and pressure drop cancellation element, lead up to K switch
1connect equivalent resistance, another road is connected in series relay K successively
0, voltage sample module, voltage-phase detection module and processor; The inside input end of pressure drop cancellation element is provided with K switch
2, between pressure drop cancellation element internal output terminal and electric energy meter, be provided with K switch
3, K switch
2and K switch
3between be provided with bypass for excising pressure drop cancellation element.
The invention also discloses a kind of method that PT secondary circuit voltage drop cancellation element based on voltage follower principle measures PT secondary circuit voltage drop, comprising:
Comprise the PT output terminal, PT secondary circuit, pressure drop cancellation element, the electric energy meter that are connected in series successively, and and be connected in the equivalent resistance of PT output terminal, draw between PT output terminal and PT secondary circuit and lead up to K switch
1connect equivalent resistance, draw a road respectively between PT secondary circuit with the inner input end of pressure drop cancellation element and be connected in series relay K successively
0, voltage sample module, voltage-phase detection module and CPU processor; The inner input end of pressure drop cancellation element is provided with K switch
2, between pressure drop cancellation element internal output terminal and electric energy meter, be provided with K switch
3, K switch
2and K switch
3between be provided with bypass for excising pressure drop cancellation element.
In the present invention, comprising:
When pressure drop device normally runs work, K switch
1, K
2, K
3close; Input measurement instruction, CPU processor control voltage measurement module relay K
0close; CPU processor instruction voltage sample module samples pressure drop cancellation element input terminal voltage U
i, voltage U
icorresponding three-phase voltage amplitude be V
i (A), V
i (B), V
i (C), phase place is Φ
i (A),Φ
i (B), Φ
i (C), signal is sent into voltage, phase detecting module and is carried out calculating, analyzes, compares, carries out measuring condition judgement, and the data of coincidence measurement condition are kept in CPU processor; K switch
2and K switch
3be communicated with bypass, K switch
1disconnect excision pressure drop cancellation element simultaneously and recover former PT secondary circuit state, voltage sample module is at pressure drop cancellation element input end sampling pressure drop cancellation element output end voltage U
o, because K switch
2and K switch
3be communicated with bypass, U
oto U
dbetween wiring length very short, pressure drop cancellation element output end voltage U
oequal electric power meter end voltage U
d, its three-phase voltage amplitude is V
o (A), V
o (B), V
o (C), phase place is Φ
o (A), Φ
o (B), Φ
o (C), signal is sent into voltage, phase detecting module and is carried out calculating, analyzes, compares, carries out measuring condition judgement, and the data of coincidence measurement condition are kept in CPU processor row relax of going forward side by side; Voltage U
oto sample K switch
2and K switch
3be communicated with pressure drop cancellation element, K switch immediately
1close, pressure drop cancellation element puts into operation simultaneously;
Measure and terminate, automatically disconnect relay K
0;
In conjunction with in pressure drop cancellation element to the measurement of load current, realize PT secondary circuit load measurement.
In the present invention, CPU processor instruction voltage sample module is sampled when the operation work of pressure drop cancellation element pressure drop cancellation element input terminal voltage U
i, voltage, phase detecting module carry out calculating, analyze, compare, carry out measuring condition judges to comprise:
Within the setting-up time cycle, voltage measurement module records one group of voltage vector U continuously
iafter by this group voltage vector U
icarry out voltage magnitude at voltage magnitude with phase detecting module, voltage-phase calculates, analyzes, compares; Adopt variance method to carry out data processing to voltage magnitude, comprising:
V
I(A)＝(V
(A)1+V
(A)2+…+V
(A)n)/n，
V
I(B)＝(V
(B)1+V
(B)2+…+V
(B)n)/n，
V
I(C)＝(V
(C)1+V
(C)2+…+V
(C)n)/n，
S
2 I(A)＝((V
(A)1-V
I(A))
2+(V
(A)2-V
I(A))
2+…+(V
(A)n-V
I(A))
2)/n，
S
2 I(B)＝((V
(B)1-V
I(B))
2+(V
(B)2-V
I(B))
2+…+(V
(B)n-V
I(B))
2)/n，
S
2 I(C)＝((V
(C)1-V
I(C))
2+(V
(C)2-V
I(C))
2+…+(V
(C)n-V
I(C))
2)/n，
S
I 2＝S
2 I(A)+S
2 I(B)+S
2 I(C)
Wherein V
(A) n, V
(B) n, V
(C) nbe respectively pressure drop cancellation element input terminal voltage U
icorresponding three-phase voltage U
i (A), U
i (B), U
i (C)in the voltage magnitude of the n-th measured value, V
i (A), V
i (B), V
i (C)be respectively the voltage magnitude arithmetic average of three-phase voltage n measured value; S
i 2value is for judge whether current voltage meets the steady measuring condition of line voltage of setting; S
2 i (A), S
2 i (B), S
2 i (C)be respectively S
i 2middle correspondence subitem;
As the voltage magnitude scope judging voltage fluctuation, with (V
(A) n-V
i (A)) be example, this case requires its absolute value≤0.01 (V) (also can require its absolute value≤0.015 (V) etc., scope range of the fluctuation of voltage broadens, and measuring error becomes large), (V
(A) n-V
i (A))
2≤ 0.0001 (V
2), then S
2 i (A)=((V
(A) 1-V
i (A))
2+ (V
(A) 2-V
i (A))
2+ ... + (V
(A) n-V
i (A))
2)/n≤0.0001 (V
2)
In like manner, S
2 i (B)≤ 0.0001 (V
2), S
2 i (C)≤ 0.0001 (V
2).
Consider the error of measurement and the direction of voltage fluctuation and scope,
Setting S
i 2=S
2 i (A)+ S
2 i (B)+ S
2 i (C)=0.0001+0.0001+0.0001=0.0003 (V
2) as line voltage whether stably criterion:
As Measurement and analysis value S
i 2when being greater than setting value 0.0003, be judged as not meeting the steady measuring condition of line voltage, then the Measuring Time section of automatic time delay one setting, restarts surveying work;
As Measurement and analysis value S
i 2when being less than or equal to setting value 0.0003, be judged as the measuring condition meeting setting, by measuring voltage amplitude V
i (A), V
i (B), V
i (C), phase place Φ
i (A), Φ
i (B), Φ
i (C)preserve;
Φ
I(A)＝(Φ
(A)1+Φ
(A)2+…+Φ
(A)n)/n，
Φ
I(B)＝(Φ
(B)1+Φ
(B)2+…+Φ
(B)n)/n，
Φ
I(C)＝(Φ
(C)1+Φ
(C)2+…+Φ
(C)n)/n，
Φ
(A) n, Φ
(B) n, Φ
(C) nfor voltage U
ithe three-phase voltage phase place of the n-th measured value of middle correspondence subitem, Φ
i (A), Φ
(B), Φ
i (C)for the arithmetic average of three-phase voltage phase place n measured value.
In the present invention, voltage sample module is sampling pressure drop cancellation element output end voltage U when recovering former PT secondary circuit state
o, voltage, phase detecting module are carried out calculating, analyze, compare, are carried out measuring condition judgement, and the data of coincidence measurement condition are kept in CPU processor row relax of going forward side by side, and comprise the following steps:
Voltage U
iimmediately simultaneously by K switch after having sampled
1disconnection, K switch
2, K
3all close the bypass of pressure drop cancellation element, pressure drop cancellation element is out of service, and PT secondary circuit is switched to former loop state, within the time cycle of setting, measure one group of voltage U immediately
o, voltage U
ocorresponding three-phase voltage amplitude is V
o (A), V
o (B), V
o (C), three-phase voltage phase place is Φ
o (A), Φ
o (B), Φ
o (C); Measurement completes instantaneously by K
1, K
2, K
3close, pressure drop cancellation element is put into operation; By this group voltage vector U measured
ocarry out voltage magnitude at voltage magnitude with phase detecting module, voltage-phase calculate, analyze, compare, adopt variance method to carry out data processing to voltage magnitude, comprising:
V
O(A)＝(V
O(A)1+V
O(A)2+…+V
O(A)n)/n，
V
O(B)＝(V
O(B)1+V
O(B)2+…+V
O(B)n)/n，
V
O(C)＝(V
O(C)1+V
O(C)2+…+V
O(C)n)/n，
S
2 O(A)＝((V
O(A)1-V
O(A))
2+(V
O(A)2-V
O(A))
2+…+(V
O(A)n-V
O(A))
2)/n，
S
2 O(B)＝((V
O(B)1-V
O(B))
2+(V
O(B)2-V
O(B))
2+…+(V
O(B)n-V
O(B))
2)/n，
S
2 O(C)＝((V
O(C)1-V
O(C))
2+(V
O(C)2-V
O(C))
2+…+(V
O(C)n-V
O(C))
2)/n，
S
O 2＝S
2 O(A)+S
2 O(B)+S
2 O(C)，
Wherein V
o (A) n, V
o (B) n, V
o (C) nfor voltage vector U
othree-phase voltage measuring values in the voltage magnitude of the n-th measured value, V
o (A), V
o (B), V
o (C)be respectively the voltage magnitude arithmetic average of three-phase voltage n measured value; S
o 2value for judge whether current voltage meets the steady measuring condition of line voltage of setting, S
2 o (A), S
2 o (B), S
2 o (C)be respectively S
o 2middle correspondence subitem;
Same setting S
o 2=S
2 o (A)+ S
2 o (B)+ S
2 o (C)=0.0001+0.0001+0.0001=0.0003 (V
2) as line voltage whether stably criterion:
As Measurement and analysis value S
o 2when being greater than setting value 0.0003, be judged as not meeting the steady measuring condition of line voltage, then the Measuring Time section of automatic time delay one setting, remeasures voltage U
i;
As Measurement and analysis value S
o 2when being less than or equal to setting value 0.0003, be judged as the measuring condition meeting setting, by above-mentioned measuring voltage amplitude V
o (A), V
o (B), V
o (C), phase place Φ
o (A), Φ
o (B), Φ
o (C)preserve,
Φ
O(A)＝(Φ
O(A)1+Φ
O(A)2+…+Φ
O(A)n)/n，
Φ
O(B)＝(Φ
O(B)1+Φ
O(B)2+…+Φ
O(B)n)/n，
Φ
O(C)＝(Φ
O(C)1+Φ
O(C)2+…+Φ
O(C)n)/n，
Wherein Φ
o (A) n, Φ
o (B) n, Φ
o (C) nbe respectively Φ
o (A, B, C)the voltage magnitude of three-phase voltage n-th measured value of middle correspondence, Φ
o (A), Φ
o (B), Φ
o (C)be respectively the arithmetic average of three-phase voltage n measured value.
In the present invention, calculate within a processor, analyze, compare V
o (A), V
o (B), V
o (C), V
i (A), V
i (B), V
i (C), Φ
o (A), Φ
o (B), Φ
o (C), Φ
i (A), Φ
i (B), Φ
i (C)ratio, the angular difference of former PT secondary circuit table end and PT output end voltage vector can be drawn, and then calculate the composition error that PT secondary circuit goes out pressure drop relative value and pressure drop:
Wherein the computing formula of ratio f is:
f
(A)＝△V
(A)/V
I(A)(％)，△V
(A)＝V
O(A)-V
I(A)(V)，
f
(B)＝△V
(B)/V
I(B)(％)，△V
(B)＝V
O(B)-V
I(B)(V)，
f
(C)＝△V
(C)/V
I(C)(％)，△V
(C)＝V
O(C)-V
I(C)(V)，
F
(A), f
(B), f
(C)be respectively the corresponding three-phase subitem of ratio f;
Wherein the computing formula of angular difference δ is: unit is (')
δ
(A)＝Φ
O(A)-Φ
I(A)，
δ
(B)＝Φ
O(B)-Φ
I(B)，
δ
(C)＝Φ
O(C)-Φ
I(C)，
δ
(A), δ
(B), δ
(C)be respectively the corresponding three-phase subitem of angular difference δ;
Pressure drop relative value △ u/U
icomputing formula be:
At calculating △ u
(A)/ U
i (A), △ u
(B)/ U
i (B), △ u
(C)/ U
i (C)time f correspond to f respectively
(A), f
(B), f
(C), δ corresponds to δ respectively
(A), δ
(B), δ
(C).
The present invention adopts increases a voltage measurement module at the pressure drop cancellation element input end based on voltage follower principle, measurement mechanism input end three-phase voltage vector.Voltage measurement module is made up of voltage sample module, voltage and phase detecting module, CPU module, display module, communication module; Also CPU module, display module, communication module can be shared with pressure drop cancellation element.The inventive method can make both can accurately eliminate PT secondary circuit voltage drop based on the PT secondary circuit voltage drop cancellation element of voltage follower principle manufacture, again can on-line measurement PT secondary circuit voltage drop.
The present invention has following advantage:
1, for the measurement of PT secondary circuit voltage drop provides new method.New method solves time-consumingly in current PT secondary circuit voltage drop, load measurement work to take a lot of work, there is potential safety hazard, inefficiency problem.
2, make full use of the public circuit resource of pressure drop cancellation element, only just can realize on-line measurement PT secondary circuit voltage drop, load in pressure drop cancellation element input end increase voltage sample module and voltage, phase detecting module.
3, long-range realization is unmanned measures automatically, saves a large amount of artificial, transport, business travel cost.The surveying work cycle can shorten, and for a change PT secondary circuit surveying work management provides technological means.
4, the cost realizing measurement function significantly reduces.
Accompanying drawing explanation
To do the present invention below in conjunction with the drawings and specific embodiments and further illustrate, above-mentioned and/or otherwise advantage of the present invention will become apparent.
Fig. 1 is structural representation of the present invention.
Embodiment
Embodiment
The present embodiment increases a voltage measurement module at the input end of pressure drop cancellation element, measures input end three-phase voltage vector.
Voltage sample module, voltage that voltage measurement module is not less than 0.1% by 1 group of measuring accuracy can link display module and communication module respectively with phase detecting module, processor (CPU module), processor; Wherein CPU module, display module, communication module also can share with pressure drop cancellation element.
The present embodiment Method And Principle: when pressure drop device puts into operation and normally works, K
1, K
2, K
3all close, voltage measurement module records one group of voltage vector U
i, can know according to the pressure drop cancellation element principle of work based on voltage follower principle, U
ibe in close proximity to now PT output end voltage U, and now PT output end voltage U is in close proximity to (K when pressure drop device does not put into operation
2, K
3all close device bypass, K
1disconnect) PT secondary circuit PT output end voltage U
p, ignore U
iwith U
pminimum error, can think U completely in engineering
iequal U
p.(the K when pressure drop device is out of service
2, K
3all close device bypass, K
1disconnect), PT secondary circuit restores to the original state, and voltage measurement module records one group of voltage vector U
o, can know according to the pressure drop cancellation element principle of work based on voltage follower principle, U
oequal former PT secondary circuit electric energy meter input terminal voltage U when pressure drop device does not put into operation
d.As measurement U
iwith U
othe time interval enough in short-term, can think that PT output voltage does not change, like this, by voltage vector U
iwith U
ocarry out voltage magnitude at voltage magnitude with phase detecting module, voltage-phase calculates, analyzes, compares, just can draw ratio, the angular difference of former PT secondary circuit table end and PT output end voltage vector, calculate the composition error of pressure drop relative value and secondary circuit voltage drop.
Analysis to measure data obtain U
i, its three-phase voltage amplitude is V
i (A), V
i (B), V
i (C), three-phase voltage phase place is Φ
i (A), Φ
i (B), Φ
i (C).By voltage ripple of power network, error is produced to measurement for reducing PT voltage, surveying work start first within the setting-up time cycle (value natural number, such as 5 seconds) voltage measurement module record one group of voltage vector U continuously
iafter by this group voltage vector U
icarry out voltage magnitude at voltage magnitude with phase detecting module, voltage-phase calculate, analyze, compare, adopt variance method to carry out data processing to voltage magnitude:
V
I(A)＝(V
(A)1+V
(A)2+…+V
(A)n)/n，
V
I(B)＝(V
(B)1+V
(B)2+…+V
(B)n)/n，
V
I(C)＝(V
(C)1+V
(C)2+…+V
(C)n)/n，
S
2 I(A)＝((V
(A)1-V
I(A))
2+(V
(A)2-V
I(A))
2+…+(V
(A)n-V
I(A))
2)/n，
S
2 I(B)＝((V
(B)1-V
I(B))
2+(V
(B)2-V
I(B))
2+…+(V
(B)n-V
I(B))
2)/n，
S
2 I(C)＝((V
(C)1-V
I(C))
2+(V
(C)2-V
I(C))
2+…+(V
(C)n-V
I(C))
2)/n，
S
I 2＝S
2 I(A)+S
2 I(B)+S
2 I(C)
Wherein V
(A) n, V
(B) n, V
(C) nfor U
i (A), U
i (B), U
i (C)the three-phase voltage amplitude of the n-th measured value in measured value, sets a S
i 2value (this numerical value with hits n about) is for judge whether current voltage meets the steady measuring condition of line voltage of setting.As Measurement and analysis value S
i 2when being greater than setting value, be judged as not meeting the steady measuring condition of line voltage, then the Measuring Time section of automatic time delay one setting, restarts surveying work.As Measurement and analysis value S
i 2when being less than or equal to setting value, be judged as the measuring condition meeting setting, by measuring voltage amplitude V
i (A), V
i (B), V
i (C), phase place Φ
i (A), Φ
i (B), Φ
i (C)preserve;
Φ
I(A)＝(Φ
(A)1+Φ
(A)2+…+Φ
(A)n)/n，
Φ
I(B)＝(Φ
(B)1+Φ
(B)2+…+Φ
(B)n)/n，
Φ
I(C)＝(Φ
(C)1+Φ
(C)2+…+Φ
(C)n)/n，
Φ
(A) n, Φ
(B) n, Φ
(C) nfor U
i (A), U
i (B), U
i (C)the three-phase voltage phase place of the n-th measured value in measured value.
Analysis to measure data obtain U
o, its three-phase voltage amplitude is V
o (A), V
o (B), V
o (C), three-phase voltage phase place is Φ
o (A), Φ
o (B), Φ
o (C).Complete sampling U
iafter K1 disconnection, K2, K3 all to be closed immediately device bypass simultaneously, pressure drop cancellation element is out of service, and PT secondary circuit is switched to former loop state, and within the time cycle of setting, (as 2 seconds) measure one group of U immediately
o.U
isample and instantaneously K1, K2, K3 have been closed, pressure drop cancellation element is put into operation.By this group U measured
ocarry out voltage magnitude at voltage magnitude with phase detecting module, voltage-phase calculate, analyze, compare, adopt variance method to carry out data processing to voltage magnitude:
V
O(A)＝(V
O(A)1+V
O(A)2+…+V
O(A)n)/n，
V
O(B)＝(V
O(B)1+V
O(B)2+…+V
O(B)n)/n，
V
O(C)＝(V
O(C)1+V
O(C)2+…+V
O(C)n)/n，
S
2 O(A)＝((V
O(A)1-V
O(A))
2+(V
O(A)2-V
O(A))
2+…+(V
O(A)n-V
O(A))
2)/n，
S
2 O(B)＝((V
O(B)1-V
O(B))
2+(V
O(B)2-V
O(B))
2+…+(V
O(B)n-V
O(B))
2)/n，
S
2 O(C)＝((V
O(C)1-V
O(C))
2+(V
O(C)2-V
O(C))
2+…+(V
O(C)n-V
O(C))
2)/n，
S
O 2＝S
2 O(A)+S
2 O(B)+S
2 O(C)
Wherein V
o (A), V
o (B), V
o (C) nfor voltage vector U
othe three-phase voltage amplitude of the n-th measured value in measured value, sets a S
o 2value (this numerical value with hits n about) is for judge whether current voltage meets the steady measuring condition of line voltage of setting.As Measurement and analysis value S
o 2when being greater than setting value, be judged as not meeting the steady measuring condition of line voltage, then the Measuring Time section of automatic time delay one setting, again from V
istart surveying work.As Measurement and analysis value S
o 2when being less than or equal to setting value, be judged as the measuring condition meeting setting, by above-mentioned measuring voltage amplitude data V
o (A), V
o (B), V
o (C), phase data Φ
o (A), Φ
o (B), Φ
o (C)preserve,
Φ
O(A)＝(Φ
O(A)1+Φ
O(A)2+…+Φ
O(A)n)/n，
Φ
O(B)＝(Φ
O(B)1+Φ
O(B)2+…+Φ
O(B)n)/n，
Φ
O(C)＝(Φ
O(C)1+Φ
O(C)2+…+Φ
O(C)n)/n，
Φ
o (A), n, Φ
o (B), n, Φ
o (C)n is V
othe three-phase voltage phase place of the n-th measured value in measured value.
By the voltage U obtained during coincidence measurement condition
i(voltage magnitude V
iwith phase place Φ
i) and U
o(voltage magnitude V
owith phase place Φ
o) carry out voltage magnitude, voltage-phase calculates, analyzes, compares, ratio, the angular difference of former PT secondary circuit table end and PT output end voltage vector can be obtained, calculate the composition error of pressure drop relative value and secondary circuit voltage drop.Even if line voltage has fluctuation, obtain pressure drop mean value several times in the many measurements of different time points is enough to the measuring error that level and smooth voltage ripple of power network brings in engineering practice.
The present embodiment measuring method:
(1) on-site manual is measured: when pressure drop device normally works, K
1, K
2, K
3all close; Manual input measurement instruction, by cpu instruction voltage measurement module relay K
0close, device is measured automatically.Cpu instruction U
ivoltage sample, voltage, phase detecting module carry out calculating, analyze, compare, measuring condition judges, the data of coincidence measurement condition are kept in CPU, and pressure drop cancellation element excises, U
ovoltage sample, voltage, phase detecting module carry out calculating, analyze, compare, measuring condition judges, the data of coincidence measurement condition are kept in CPU row relax of going forward side by side, and pressure drop cancellation element puts into operation; The display of measurement data result scene, measurement data result can transfer to system background by communication module and do further process.Measure and terminate, automatically disconnect relay K
0.
(2) remote auto is measured: when pressure drop device normally works, K
1, K
2, K
3all close; Measurement instruction is assigned on backstage, by cpu instruction voltage measurement module relay K
0close, device is measured automatically.Cpu instruction U
ivoltage sample, voltage, phase detecting module carry out calculating, analyze, compare, measuring condition judges, the data of coincidence measurement condition are kept in CPU, and pressure drop cancellation element excises, U
ovoltage sample, voltage, phase detecting module carry out calculating, analyze, compare, measuring condition judges, the data of coincidence measurement condition are kept in CPU row relax of going forward side by side, and pressure drop cancellation element puts into operation; The display of measurement data result scene, measurement data result can transfer to system background by communication module and do further process.Measure and terminate, automatically disconnect relay K
0.
(3) in conjunction with in pressure drop cancellation element to the measurement of load current, realize PT secondary circuit load measurement, the two myopia is equal.
6, voltage measurement module forms the standalone module be separated with pressure drop cancellation element, adopts plug-in to be connected with pressure drop cancellation element; Be convenient to the combination of overall pressure drop cancellation element function; Also can disperse to be integrated in pressure drop cancellation element.
7, voltage measurement module working power is provided by pressure drop device working power
The invention provides a kind of circuit measuring PT secondary circuit voltage drop based on pressure drop cancellation element; the method and access of this technical scheme of specific implementation is a lot; the above is only the preferred embodiment of the present invention; should be understood that; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.The all available prior art of each ingredient not clear and definite in the present embodiment is realized.
Claims (5)
1. measure the circuit of PT secondary circuit voltage drop based on pressure drop cancellation element for one kind, comprise the PT output terminal, PT secondary circuit, pressure drop cancellation element, the electric energy meter that are connected in series successively, and and be connected in the equivalent resistance of PT output terminal, it is characterized in that, draw between PT output terminal and PT secondary circuit and lead up to K switch
1connect equivalent resistance, draw a road respectively between PT secondary circuit with the inner input end of pressure drop cancellation element and be connected in series relay K successively
0, voltage sample module, voltage-phase detection module and CPU processor; The inner input end of pressure drop cancellation element is provided with K switch
2, between pressure drop cancellation element internal output terminal and electric energy meter, be provided with K switch
3, K switch
2and K switch
3between be provided with bypass for excising pressure drop cancellation element.
2., based on a method for the PT secondary circuit voltage drop cancellation element measurement PT secondary circuit voltage drop of voltage follower principle, it is characterized in that, comprising:
When pressure drop device normally runs work, K switch
1, K
2, K
3close; Input measurement instruction, CPU processor control voltage measurement module relay K
0close; CPU processor instruction voltage sample module samples pressure drop cancellation element input terminal voltage U
i, voltage U
icorresponding three-phase voltage amplitude be V
i (A), V
i (B), V
i (C), phase place is Φ
i (A), Φ
i (B), Φ
i (C), signal is sent into voltage, phase detecting module and is carried out calculating, analyzes, compares, carries out measuring condition judgement, and the data of coincidence measurement condition are kept in CPU processor; K switch
2and K switch
3be communicated with bypass, K switch
1disconnect excision pressure drop cancellation element simultaneously and recover former PT secondary circuit state, voltage sample module is at pressure drop cancellation element input end sampling pressure drop cancellation element output end voltage U
o, pressure drop cancellation element output end voltage U
oequal electric power meter end voltage U
d, its three-phase voltage amplitude is V
o (A), V
o (B), V
o (C), phase place is Φ
o (A), Φ
o (B), Φ
o (C), signal is sent into voltage, phase detecting module and is carried out calculating, analyzes, compares, carries out measuring condition judgement, and the data of coincidence measurement condition are kept in CPU processor row relax of going forward side by side; Voltage U
oto sample K switch
2and K switch
3be communicated with pressure drop cancellation element, K switch immediately
1close, pressure drop cancellation element puts into operation simultaneously;
Measure and terminate, automatically disconnect relay K
0;
In conjunction with in pressure drop cancellation element to the measurement of load current, realize PT secondary circuit load measurement.
3. method according to claim 2, is characterized in that, CPU processor instruction voltage sample module is sampled when the operation work of pressure drop cancellation element pressure drop cancellation element input terminal voltage U
i, voltage, phase detecting module carry out calculating, analyze, compare, carry out measuring condition judges to comprise:
Within the setting-up time cycle, voltage measurement module records one group of voltage vector U continuously
iafter by this group voltage vector U
icarry out voltage magnitude at voltage magnitude with phase detecting module, voltage-phase calculates, analyzes, compares; Adopt variance method to carry out data processing to voltage magnitude, comprising:
V
I(A)＝(V
(A)1+V
(A)2+…+V
(A)n)/n，
V
I(B)＝(V
(B)1+V
(B)2+…+V
(B)n)/n，
V
I(C)＝(V
(C)1+V
(C)2+…+V
(C)n)/n，
S
2 I(A)＝((V
(A)1-V
I(A))
2+(V
(A)2-V
I(A))
2+…+(V
(A)n-V
I(A))
2)/n，
S
2 I(B)＝((V
(B)1-V
I(B))
2+(V
(B)2-V
I(B))
2+…+(V
(B)n-V
I(B))
2)/n，
S
2 I(C)＝((V
(C)1-V
I(C))
2+(V
(C)2-V
I(C))
2+…+(V
(C)n-V
I(C))
2)/n，
S
I 2＝S
2 I(A)+S
2 I(B)+S
2 I(C)
Wherein V
(A) n, V
(B) n, V
(C) nbe respectively pressure drop cancellation element input terminal voltage U
icorresponding three-phase voltage U
i (A), U
i (B), U
i (C)in the voltage magnitude of the n-th measured value, V
i (A), V
i (B), V
i (C)be respectively the voltage magnitude arithmetic average of three-phase voltage n measured value; S
i 2value is for judge whether current voltage meets the steady measuring condition of line voltage of setting; S
2 i (A), S
2 i (B), S
2 i (C)be respectively S
i 2middle correspondence subitem;
As Measurement and analysis value S
i 2when being greater than setting value 0.0003, be judged as not meeting the steady measuring condition of line voltage, then the Measuring Time section of automatic time delay one setting, restarts surveying work;
As Measurement and analysis value S
i 2when being less than or equal to setting value 0.0003, be judged as the measuring condition meeting setting, by measuring voltage amplitude V
i (A), V
i (B), V
i (C), phase place Φ
i (A), Φ
i (B), Φ
i (C)preserve;
Φ
I(A)＝(Φ
(A)1+Φ
(A)2+…+Φ
(A)n)/n，
Φ
I(B)＝(Φ
(B)1+Φ
(B)2+…+Φ
(B)n)/n，
Φ
I(C)＝(Φ
(C)1+Φ
(C)2+…+Φ
(C)n)/n，
Φ
(A) n, Φ
(B) n, Φ
(C) nfor voltage U
ithe three-phase voltage phase place of the n-th measured value of middle correspondence subitem, Φ
i (A), Φ
(B), Φ
i (C)for the arithmetic average of three-phase voltage phase place n measured value.
4. method according to claim 3, is characterized in that, voltage sample module is sampling pressure drop cancellation element output end voltage U when recovering former PT secondary circuit state
o, voltage, phase detecting module are carried out calculating, analyze, compare, are carried out measuring condition judgement, and the data of coincidence measurement condition are kept in CPU processor row relax of going forward side by side, and comprise the following steps:
Voltage U
iimmediately simultaneously by K switch after having sampled
1disconnection, K switch
2, K
3all close the bypass of pressure drop cancellation element, pressure drop cancellation element is out of service, and PT secondary circuit is switched to former loop state, within the time cycle of setting, measure one group of voltage U immediately
o, voltage U
ocorresponding three-phase voltage amplitude is V
o (A), V
o (B), V
o (C), three-phase voltage phase place is Φ
o (A), Φ
o (B), Φ
o (C); Measurement completes instantaneously by K
1, K
2, K
3close, pressure drop cancellation element is put into operation; By this group voltage vector U measured
ocarry out voltage magnitude at voltage magnitude with phase detecting module, voltage-phase calculate, analyze, compare, adopt variance method to carry out data processing to voltage magnitude, comprising:
V
O(A)＝(V
O(A)1+V
O(A)2+…+V
O(A)n)/n，
V
O(B)＝(V
O(B)1+V
O(B)2+…+V
O(B)n)/n，
V
O(C)＝(V
O(C)1+V
O(C)2+…+V
O(C)n)/n，
S
2 O(A)＝((V
O(A)1-V
O(A))
2+(V
O(A)2-V
O(A))
2+…+(V
O(A)n-V
O(A))
2)/n，
S
2 O(B)＝((V
O(B)1-V
O(B))
2+(V
O(B)2-V
O(B))
2+…+(V
O(B)n-V
O(B))
2)/n，
S
2 O(C)＝((V
O(C)1-V
O(C))
2+(V
O(C)2-V
O(C))
2+…+(V
O(C)n-V
O(C))
2)/n，
S
O 2＝S
2 O(A)+S
2 O(B)+S
2 O(C)，
Wherein V
o (A) n, V
o (B) n, V
o (C) nfor voltage vector U
othree-phase voltage measuring values in the voltage magnitude of the n-th measured value, V
o (A), V
o (B), V
o (C)be respectively the voltage magnitude arithmetic average of three-phase voltage n measured value; S
o 2value for judge whether current voltage meets the steady measuring condition of line voltage of setting, S
2 o (A), S
2 o (B), S
2 o (C)be respectively S
o 2middle correspondence subitem;
As Measurement and analysis value S
o 2when being greater than setting value 0.0003, be judged as not meeting the steady measuring condition of line voltage, then the Measuring Time section of automatic time delay one setting, remeasures voltage U
i;
As Measurement and analysis value S
o 2when being less than or equal to setting value 0.0003, be judged as the measuring condition meeting setting, by above-mentioned measuring voltage amplitude V
o (A), V
o (B), V
o (C), phase place Φ
o (A), Φ
o (B), Φ
o (C)preserve,
Φ
O(A)＝(Φ
O(A)1+Φ
O(A)2+…+Φ
O(A)n)/n，
Φ
O(B)＝(Φ
O(B)1+Φ
O(B)2+…+Φ
O(B)n)/n，
Φ
O(C)＝(Φ
O(C)1+Φ
O(C)2+…+Φ
O(C)n)/n，
Wherein Φ
o (A) n, Φ
o (B) n, Φ
o (C) nbe respectively Φ
o (A, B, C)the voltage magnitude of three-phase voltage n-th measured value of middle correspondence, Φ
o (A), Φ
o (B), Φ
o (C)be respectively the arithmetic average of three-phase voltage n measured value.
5. method according to claim 4, is characterized in that, calculates within a processor, analyzes, compares V
o (A), V
o (B), V
o (C), V
i (A), V
i (B), V
i (C), Φ
o (A), Φ
o (B), Φ
o (C), Φ
i (A), Φ
i (B), Φ
i (C)ratio, the angular difference of former PT secondary circuit table end and PT output end voltage vector can be drawn, and then calculate the composition error that PT secondary circuit goes out pressure drop relative value and pressure drop:
Wherein the computing formula of ratio f is:
f
(A)＝△V
(A)/V
I(A)，△V
(A)＝V
O(A)-V
I(A)，
f
(B)＝△V
(B)/V
I(B)，△V
(B)＝V
O(B)-V
I(B)，
f
(C)＝△V
(C)/V
I(C)，△V
(C)＝V
O(C)-V
I(C)，
F
(A), f
(B), f
(C)be respectively the corresponding three-phase subitem of ratio f;
Wherein the computing formula of angular difference δ is:
δ
(A)＝Φ
O(A)-Φ
I(A)，
δ
(B)＝Φ
O(B)-Φ
I(B)，
δ
(C)＝Φ
O(C)-Φ
I(C)，
δ
(A), δ
(B), δ
(C)be respectively the corresponding three-phase subitem of angular difference δ;
Pressure drop relative value △ u/U
icomputing formula be:
At calculating △ u
(A)/ U
i (A), △ u
(B)/ U
i (B), △ u
(C)/ U
i (C)time f correspond to f respectively
(A), f
(B), f
(C), δ corresponds to δ respectively
(A), δ
(B), δ
(C).
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Effective date of registration: 20190103 Address after: No. 19 Suyuan Avenue, Jiangning Economic and Technological Development Zone, Nanjing City, Jiangsu Province, 210000 Patentee after: Nanjing dry Power Technology Co., Ltd. Address before: 211151 No. 1 Boai Road, Nanjing Airport Industrial Park, Jiangsu Province Patentee before: Qian Kun |