CN108120947A - CT secondary circuit power theft monitoring methods based on frequency-selecting - Google Patents
CT secondary circuit power theft monitoring methods based on frequency-selecting Download PDFInfo
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- CN108120947A CN108120947A CN201810057917.3A CN201810057917A CN108120947A CN 108120947 A CN108120947 A CN 108120947A CN 201810057917 A CN201810057917 A CN 201810057917A CN 108120947 A CN108120947 A CN 108120947A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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Abstract
The present invention relates to the CT secondary circuit power theft monitoring methods based on frequency-selecting, reference frequency output is preset under open-circuit condition by being directed to CT secondary circuits in electric energy meter, the frequency increments exported to CT secondary circuits are set with presetting coarse adjustment steps, the output frequency for obtaining CT detection voltage max corresponding to the CT detection voltage max in voltage value of the CT secondary circuits under multiple output frequencies is coarse adjustment resonance dot frequency；The fine tuning step-length of CT secondary circuits default reference frequency output in the short-circuit state and output frequency is set, CT detection voltage value of the CT secondary circuits under multiple output frequencies and the maximum in these CT detection voltages are obtained with reference to coarse adjustment resonance dot frequency and fine tuning step-length, using output frequency corresponding to gained CT detections voltage max at this time as fine tuning resonance dot frequency, according to CT secondary circuits in coarse adjustment, the current state of corresponding maximum CT detection voltage values and the current CT detections voltage value accurate judgement CT secondary circuits of CT secondary circuits in fine-tuning process, know CT secondary circuits currently with the presence or absence of stolen risk.
Description
Technical field
The present invention relates to electric power monitoring field more particularly to a kind of CT secondary circuit power theft monitoring methods based on frequency-selecting.
Background technology
Current transformer (CT) is the important component of electric network protection, adjusting, measurement and monitoring system, to electric system
Safe and stable operation play a crucial role.For a long time, some illegal power consumers are by using CT second open circuits
Or the method for CT second short circuits carries out stealing and illegally makes a profit, so that electric energy meter institute quantity calculation is less than actually used electricity, very
To not quantity calculation, national electric energy is caused largely to be lost in, seriously compromise the legitimate rights and interests of electric power enterprise, not only affect electric power enterprise
The development of industry, while great security risk is also brought to user power utilization, it is therefore desirable to CT secondary circuits are monitored with the presence or absence of surreptitiously
Risk.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of CT secondary returnings based on frequency-selecting for the above-mentioned prior art
Road power theft monitoring method.
Technical solution is used by the present invention solves above-mentioned technical problem：CT secondary circuit power theft monitorings based on frequency-selecting
Method, for having the electric power terminal of CT secondary circuits, which is characterized in that the CT secondary circuit power theft monitorings based on frequency-selecting
Method includes the following steps 1 to step 10：
Step 1, the CT secondary circuits in the electric power terminal are under open-circuit condition, are exported according to predeterminated frequency scope
Frequency is to the CT secondary circuits in electric power terminal；Wherein, the predeterminated frequency range flags are (fStart,fEnd), fStartFor institute
State the initial frequency of predeterminated frequency scope, fEndFor the termination frequency of the predeterminated frequency scope；
Step 2, the incremental coarse adjustment steps of set of frequency from the CT secondary circuits to electric power terminal that exported for, and
CT secondary circuits in the range of predeterminated frequency based on initial frequency according to the coarse adjustment steps successively into electric power terminal are defeated
Go out the frequency of multiple numbers；
Wherein, the coarse adjustment steps are labeled as H1, the CT secondary circuits institute in coarse tuning process into the electric power terminal
The total number of output frequency is labeled as N, exported n-th of the CT secondary circuits in coarse tuning process into the electric power terminal
Frequency marker is fn, fn=fStart+n·H1, fStart≤fn≤fEnd, 1≤n≤N, H1>0；
Step 3, real-time voltage sampling is carried out for the CT secondary circuits in the electric power terminal, obtains CT secondary circuits and exist
Corresponding CT detections voltage value during each output frequency, each output frequency formed for CT secondary circuits detect voltage with CT
Correspondence list between value；
Step 4, in the correspondence list formed in step 3, the highest CT detection voltage values of CT secondary circuits are obtained
And the output frequency of corresponding highest CT detections voltage value, and to correspond to the output frequencies of highest CT detection voltage values as CT
Coarse adjustment resonance dot frequency of the secondary circuit in coarse tuning process；Wherein, coarse tuning of the labeling CT secondary circuit in coarse tuning process
Dot frequency of shaking is f0；
Step 5, based on gained coarse adjustment resonance dot frequency, frequency is exported for the CT secondary circuits into electric power terminal
Rate sets fine tuning scope and the incremental fine tuning step-length of output frequency, and according to the fine tuning step-length in the range of the fine tuning
The CT secondary circuits into electric power terminal export the frequency of multiple numbers again successively；
Wherein, the fine tuning range flags set for the CT secondary circuits institute output frequency into electric power terminal are (f0-△
f,f0F), △ f is for predeterminated frequency ripple of the CT secondary circuits institute output frequency in fine-tuning process into electric power terminal to+△
Dynamic value, the fine tuning step-length are labeled as H2, the CT secondary circuits institute output frequency in fine-tuning process into the electric power terminal
Total number labeled as M, m-th of frequency marker that the CT secondary circuits in fine-tuning process into the electric power terminal are exported
For f 'm, f 'm=(f0-△f)+m·H2, f0-△f≤f′m≤f0+ △ f, 1≤m≤M；△f>0, H2>0；
Step 6, real-time voltage sampling is carried out again for the CT secondary circuits in the electric power terminal, obtain CT secondary returnings
Road corresponding CT detections voltage value in each output frequency, forms each output frequency and CT for CT secondary circuits again
Detect the correspondence list between voltage value；
Step 7, in the correspondence list formed in step 6, the highest CT detection voltage values of CT secondary circuits are obtained
And the output frequency of corresponding highest CT detections voltage value, and to correspond to the output frequencies of highest CT detection voltage values as CT
Fine tuning resonance dot frequency of the secondary circuit in fine-tuning process；Wherein, the highest CT of CT secondary circuits described in the step 7 is marked
Detection voltage value is VOpen；Fine tuning resonance dot frequency of the CT secondary circuits in fine-tuning process is f '0；
Step 8, the CT secondary circuits in the electric power terminal are under short-circuit condition, the CT into the electric power terminal
The fine tuning resonance dot frequency of secondary circuit input step 7, and the CT secondary circuits are obtained in the fine tuning resonance dot frequency
Under corresponding CT detection voltage value；Wherein, the CT secondary circuit of the mark under short-circuit condition is in fine tuning resonance point frequency
Corresponding CT detections voltage value is V under rateShort；
Step 9, in normal operation, the CT secondary circuits injection into electric power terminal is described thin for the electric power terminal
Dot frequency of shaking is tuned, obtains current CT detection voltage value of the CT secondary circuits under current state；Wherein, the CT is marked bis- times
Current CT detection voltage value of the circuit under current state is VCur, current power of the CT secondary circuits under current state
Terminal input current value is ICur；
Step 10, the highest CT according to the CT secondary circuits in step 7 detects gained CT in voltage value, step 8 and examines
It surveys the current CT detections voltage value of gained in voltage value and step 9 to be judged, judges the current state of the CT secondary circuits,
To know the CT secondary circuits currently with the presence or absence of stolen risk：
As the current CT detection voltage values VCur>VOpenα and the current power terminal input current value ICur<
IThe,OpenWhen, judge that the CT secondary circuits are currently at open-circuit condition, the CT secondary circuits have stolen risk；Its
In, the α represents the CT open circuit proportion threshold values of CT secondary circuits, IThe,OpenRepresent the CT secondary circuits under open-circuit condition in fine tuning
Resonance dot frequency f '0When corresponding CT open-circuit currents threshold value；
As the current CT detection voltage values VCur<(VShort+(VOpen-VShort) β) and current power terminal input
Current value ICur<IThe,ShortWhen, judge that the CT secondary circuits are currently at short-circuit condition, the CT secondary circuits exist stolen
Risk；Wherein, the β represents the CT short circuit proportion threshold values of CT secondary circuits, IThe,ShortCT under expression short-circuit condition bis- times
Circuit is in fine tuning resonance dot frequency f '0When corresponding CT short circuit current flows threshold value；
When the CT secondary circuits are not currently in open-circuit condition and are not at short-circuit condition, the CT secondary returnings are judged
Road is currently at normal electricity consumption state, and stolen risk is not present in the CT secondary circuits.
With improvement, in the CT secondary circuit power theft monitoring methods based on frequency-selecting, the CT of the CT secondary circuits is opened
Road proportion threshold value α ∈ [0.75,0.85], the CT open-circuit currents threshold value 0<IThe,Open<IIt is specified0.5%, IIt is specifiedFor the electric power
The load current value of terminal.
Preferably, CT open circuit proportion threshold values α=0.8 of the CT secondary circuits.
With improvement, in the CT secondary circuit power theft monitoring methods based on frequency-selecting, the CT of the CT secondary circuits is short
Road proportion threshold value β ∈ [0.25,0.35], the CT short circuit current flows threshold value IThe,Short=IIt is specified+ △ I, IIt is specifiedFor the electric power terminal
Load current value, △ I → 0+。
Preferably, CT short circuit ratios threshold value beta=0.3 of the CT secondary circuits.
Further, in the CT secondary circuit power theft monitoring methods based on frequency-selecting, the CT short circuit current flows threshold value
IThe,Short=IIt is specified, IIt is specifiedFor the load current value of the electric power terminal.
It improves again, the CT secondary circuit power theft monitoring methods based on frequency-selecting further include：Judge in the electric power terminal
CT secondary circuits when being currently at open-circuit condition, the step of electric power terminal makes alarm.
It improves again, the CT secondary circuit power theft monitoring methods based on frequency-selecting further include：Judge in the electric power terminal
CT secondary circuits when being currently at short-circuit condition, the step of electric power terminal makes alarm.
Optionally, in the CT secondary circuit power theft monitoring methods based on frequency-selecting, the alarm is sound report
Alert prompting or light warning prompting or the prompting of sound light warning.
It improves, in the CT secondary circuit power theft monitoring methods based on frequency-selecting, exports in the electric power terminal again
The output frequency of CT secondary circuits exports for the electric power terminal.
Compared with prior art, the advantage of the invention is that：By being directed in electric energy meter CT secondary circuits in open-circuit condition
Default reference frequency output down, and carry out being incremented by setting to the frequency of CT secondary circuits to exporting with default coarse adjustment steps, it obtains
Voltage value is detected to the CT in CT secondary circuits under multiple output frequencies, and is got maximum in these CT detection voltage values
The corresponding output frequency of value is as coarse adjustment resonance dot frequency；It sets for the default output of CT secondary circuits in the short-circuit state
The fine tuning step-length of frequency range and output frequency obtains CT secondary circuits more with reference to coarse adjustment resonance dot frequency and fine tuning step-length
The maximum in CT detection voltage values and these CT detection voltages under a output frequency, and with gained CT detections voltage at this time
Output frequency corresponding to maximum is as fine tuning resonance dot frequency, then according to CT secondary circuits under open-circuit condition and short-circuit shape
Highest CT detection voltage values and the current CT of CT secondary circuits under state detect the current of voltage value accurate judgement CT secondary circuits
State, so as to accurately know that CT secondary circuits currently with the presence or absence of stolen risk, effectively prevent the non-of some electrical power user
The legitimate rights and interests of electric power enterprise and the normal electricity consumption order of power consumer are safeguarded in method electricity stealing.
Description of the drawings
Fig. 1 is the CT secondary circuit power theft monitoring method flow schematic diagrams based on frequency-selecting in the embodiment of the present invention.
Specific embodiment
The present invention is described in further detail below in conjunction with attached drawing embodiment.
As shown in Figure 1, the CT secondary circuit power theft monitoring methods based on frequency-selecting in the present embodiment, for having CT secondary returnings
The electric power terminal on road, the CT secondary circuit power theft monitoring methods based on frequency-selecting of being somebody's turn to do include the following steps 1 to step 10：
Step 1, the CT secondary circuits in electric power terminal are under open-circuit condition, according to predeterminated frequency scope output frequency
To the CT secondary circuits in electric power terminal；Wherein, the predeterminated frequency range flags in the present embodiment are (fStart,fEnd), fStart
For the initial frequency of predeterminated frequency scope, fEndFor the termination frequency of predeterminated frequency scope；In the present embodiment, export to electric power
The output frequency of CT secondary circuits exports for the electric power terminal in terminal；
Step 2, for the incremental coarse adjustment steps of the set of frequency of electric power terminal output, and by the electric power terminal in default frequency
Rate scope (fStart,fEnd) interior with initial frequency fStartBased on CT secondary circuits according to the coarse adjustment steps successively into it is defeated
Go out the frequency of multiple numbers；
Step 2, the incremental coarse adjustment steps of set of frequency from the CT secondary circuits to electric power terminal that exported for, and
With initial frequency f in the range of predeterminated frequencyStartBased on according to the coarse adjustment steps successively CT secondary circuits into electric power terminal
Export the frequency of multiple numbers；
Wherein, coarse adjustment steps are labeled as H1, the CT secondary circuits institute output frequency in coarse tuning process into electric power terminal
Total number labeled as N, n-th of frequency marker that the CT secondary circuits in coarse tuning process into electric power terminal are exported is
fn, fn=fStart+n·H1, fStart≤fn≤fEnd, 1≤n≤N, H1>0；
For example, the 2nd frequency marker that the CT secondary circuits into electric power terminal are exported is f2, f2=fStart+2·H1；
Step 3, real-time voltage sampling is carried out for the CT secondary circuits in electric power terminal, obtains CT secondary circuits each defeated
Go out corresponding CT detections voltage value during frequency, formed between each output frequency and CT the detection voltage value for CT secondary circuits
Correspondence list；
For example, the output frequency for the CT secondary circuits in electric power terminal is f2When, the CT secondary circuits are in output frequency
Rate f2Corresponding CT detection voltage values are just labeled as V2；Output frequency for the CT secondary circuits in electric power terminal is fNWhen,
The CT secondary circuits are in output frequency fNCorresponding CT detection voltage values are just labeled as VN；
Specifically, it is corresponding between each output frequency for CT secondary circuits and CT the detection voltage value formed here
The following form of relation list：
Output frequency is f1, the CT detection voltage values corresponding to the CT secondary circuits are V1；Output frequency is f2, the CT bis-
CT detection voltage values corresponding to minor loop are V2；…；Output frequency is fN-1, the CT detection electricity corresponding to the CT secondary circuits
Pressure value is VN-1；Output frequency is fN, the CT detection voltage values corresponding to the CT secondary circuits are VN；
Step 4, in the correspondence list formed in step 3, the highest CT detection voltage values of CT secondary circuits are obtained
And the output frequency of corresponding highest CT detections voltage value, and to correspond to the output frequencies of highest CT detection voltage values as CT
Coarse adjustment resonance dot frequency of the secondary circuit in coarse tuning process；Wherein, coarse tuning of the labeling CT secondary circuit in coarse tuning process
Dot frequency of shaking is f0；
Specifically, the highest CT detection voltage values of CT secondary circuits described in the step 4 are V1To VNThis N number of voltage
Maximum in value；
Step 5, with gained coarse adjustment resonance dot frequency f0Based on, it is exported for the CT secondary circuits into electric power terminal
Frequency sets fine tuning scope and the incremental fine tuning step-length of output frequency, and in the range of fine tuning according to fine tuning step-length successively to
CT secondary circuits in electric power terminal export the frequency of multiple numbers again；
Wherein, the fine tuning range flags set for the CT secondary circuits institute output frequency into electric power terminal are (f0-△
f,f0F), △ f is for predeterminated frequency ripple of the CT secondary circuits institute output frequency in fine-tuning process into electric power terminal to+△
Dynamic value, fine tuning step-length are labeled as H2, the total number of the CT secondary circuits institute output frequency in fine-tuning process into electric power terminal
Labeled as M, m-th of frequency marker that the CT secondary circuits in fine-tuning process into electric power terminal are exported is f 'm, f 'm=
(f0-△f)+m·H2, f0-△f≤f′m≤f0+ △ f, 1≤m≤M；△f>0, H2>0；
For example, the 2nd frequency marker that the CT secondary circuits into electric power terminal are exported is f '2, f '2=(f0-△f)+
2·H2；
Step 6, real-time voltage sampling is carried out again for the CT secondary circuits in electric power terminal, obtain CT secondary circuits and exist
Corresponding CT detections voltage value during each output frequency, each output frequency formed again for CT secondary circuits detect voltage with CT
Correspondence list between value；
For example, in the step 6, the output frequency for the CT secondary circuits in electric power terminal is f '2When, the CT bis- times
Circuit is in output frequency f '2Corresponding CT detection voltage values are just labeled as V '2；For the CT secondary circuits in electric power terminal
Output frequency is f 'MWhen, the CT secondary circuits are in output frequency f 'MCorresponding CT detection voltage values are just labeled as V'M；
Specifically, it is corresponding between each output frequency for CT secondary circuits and CT the detection voltage value formed here
The following form of relation list：
Output frequency is f '1, the CT detection voltage values corresponding to the CT secondary circuits are V '1；Output frequency is f '2, the CT
CT detection voltage values corresponding to secondary circuit are V '2；…；Output frequency is f'M-1, the CT inspections corresponding to the CT secondary circuits
Survey voltage value is V'M-1；Output frequency is f'M, the CT detection voltage values corresponding to the CT secondary circuits are V'M；
Step 7, in the correspondence list formed in step 6, the highest CT detection voltage values of CT secondary circuits are obtained
And the electric power terminal output frequency of corresponding highest CT detection voltage values, and the output frequency to correspond to highest CT detection voltage values
Fine tuning resonance dot frequency of the rate as CT secondary circuits in fine-tuning process；Wherein, CT secondary circuits are marked in the step 7 most
High CT detections voltage value is VOpen；Fine tuning resonance dot frequency of the CT secondary circuits in fine-tuning process is f '0；
Specifically, the highest CT detection voltage values of CT secondary circuits described in the step 7 are V '1To V'MThis M electricity
Maximum in pressure value；
Step 8, the CT secondary circuits in electric power terminal are under short-circuit condition, the CT secondary circuits into electric power terminal
The fine tuning resonance dot frequency f ' of input step 70, and CT secondary circuits are obtained in fine tuning resonance dot frequency f '0Under it is corresponding
CT detects voltage value；Wherein, CT secondary circuit of the mark under short-circuit condition is in fine tuning resonance dot frequency f '0Under it is corresponding
CT detection voltage values are VShort；
Step 9, in normal operation, the CT secondary circuits into electric power terminal inject fine tuning resonance point to electric power terminal
Frequency obtains current CT detection voltage value of the CT secondary circuits under current state；Wherein, labeling CT secondary circuit is in current shape
Current CT detection voltage values under state are VCur, current power terminal input current value of the CT secondary circuits under current state be
ICur；
Step 10, the highest CT according to CT secondary circuits in step 7 detects gained CT in voltage value, step 8 and detects electricity
The current CT detections voltage value of gained is judged in pressure value and step 9, the current state of CT secondary circuits is judged, to know CT
Secondary circuit is currently with the presence or absence of stolen risk：
As current CT detection voltage values VCur>VOpenα and current power terminal input current value ICur<IThe,OpenWhen, sentence
Disconnected CT secondary circuits are currently at open-circuit condition, and CT secondary circuits have stolen risk；Wherein, α here represents CT bis- times
The CT open circuit proportion threshold values in circuit, CT open circuits proportion threshold value value range meets α ∈ [0.75,0.85] in the embodiment, and CT is opened
Preferred α=0.8 of road proportion threshold value；IThe,OpenRepresent the CT secondary circuits under open-circuit condition in fine tuning resonance dot frequency f '0When pair
The CT open-circuit current threshold values answered；CT open-circuit currents threshold value meets 0<IThe,Open<IIt is specified0.5%, IIt is specifiedFor the specified of electric power terminal
Current value；
As current CT detection voltage values VCur<(VShort+(VOpen-VShorT) β) and current power terminal input current value
ICur<IThe,ShortWhen, judge that CT secondary circuits are currently at short-circuit condition, CT secondary circuits have stolen risk；Wherein, this
In β represent the CT short circuit proportion threshold values of CT secondary circuits, CT short circuit proportion threshold value value ranges meet β ∈ in the embodiment
[0.25,0.35], preferred β=0.3 of CT short circuit proportion threshold values；IThe,ShortRepresent the CT secondary circuits under short-circuit condition in fine tuning
Resonance dot frequency f '0When corresponding CT short circuit current flows threshold value, CT short circuit current flow threshold values meet IThe,Short=IIt is specified+ △ I, IIt is specifiedFor
The load current value of electric power terminal, △ I → 0+；The preferred I of the CT short circuit current flow threshold values in the present embodimentThe,Short=IIt is specified；
When CT secondary circuits are not currently in open-circuit condition and are not at short-circuit condition, judge that CT secondary circuits are currently located
In normal electricity consumption state, stolen risk is not present in CT secondary circuits.
In order to monitor CT secondary circuits there are timely early warning is provided during stealing risk, in the CT bis- of the present embodiment
Minor loop power theft monitoring method can also include：When judging that the CT secondary circuits in electric power terminal are currently at open-circuit condition, electricity
Power terminal makes alarm.It is of course also possible to when judging that the CT secondary circuits in electric power terminal are currently at short-circuit condition,
Electric power terminal makes alarm.Wherein, alarm described in above-mentioned two situations is audible alarm prompting or light report
Alert prompting or the prompting of sound light warning can specifically set the mode of alarm according to actual needs.
Although the preferred embodiment of the present invention described in detail above, it is to be clearly understood that for this field
Technical staff for, the invention may be variously modified and varied.That is made within the spirit and principles of the invention appoints
What modification, equivalent substitution, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. the CT secondary circuit power theft monitoring methods based on frequency-selecting, for having the electric power terminal of CT secondary circuits, feature exists
In the CT secondary circuit power theft monitoring methods based on frequency-selecting include the following steps 1 to step 10：
Step 1, the CT secondary circuits in the electric power terminal are under open-circuit condition, according to predeterminated frequency scope output frequency
To the CT secondary circuits in electric power terminal；Wherein, the predeterminated frequency range flags are (fStart,fEnd), fStartTo be described pre-
If the initial frequency of frequency range, fEndFor the termination frequency of the predeterminated frequency scope；
Step 2, the incremental coarse adjustment steps of set of frequency from the CT secondary circuits to electric power terminal that exported for, and default
CT secondary circuits output in frequency range based on initial frequency according to the coarse adjustment steps successively into electric power terminal is more
Number purpose frequency；
Wherein, the coarse adjustment steps are labeled as H1, the CT secondary circuits in coarse tuning process into the electric power terminal export frequency
The total number of rate is labeled as N, n-th of frequency mark that the CT secondary circuits in coarse tuning process into the electric power terminal are exported
It is denoted as fn, fn=fStart+n·H1, fStart≤fn≤fEnd, 1≤n≤N, H1>0；
Step 3, real-time voltage sampling is carried out for the CT secondary circuits in the electric power terminal, obtains CT secondary circuits described
Corresponding CT detection voltage value during each output frequency, formed for CT secondary circuits each output frequency and CT detections voltage value it
Between correspondence list；
Step 4, in the correspondence list formed in step 3, obtain CT secondary circuits highest CT detection voltage value and
The output frequency of corresponding highest CT detections voltage value, and to correspond to the output frequencies of highest CT detection voltage values as CT bis- times
Coarse adjustment resonance dot frequency of the circuit in coarse tuning process；Wherein, coarse adjustment resonance point of the labeling CT secondary circuit in coarse tuning process
Frequency is f0；
Step 5, based on gained coarse adjustment resonance dot frequency, for the CT secondary circuits institute output frequency into electric power terminal
Fine tuning scope and the incremental fine tuning step-length of output frequency be set, and in the range of the fine tuning according to the fine tuning step-length successively
CT secondary circuits into electric power terminal export the frequency of multiple numbers again；
Wherein, the fine tuning range flags set for the CT secondary circuits institute output frequency into electric power terminal are (f0-△f,f0+
△ f), △ f for for predeterminated frequency undulating value of the CT secondary circuits institute output frequency in fine-tuning process into electric power terminal,
The fine tuning step-length is labeled as H2, the sum of the CT secondary circuits institute output frequency in fine-tuning process into the electric power terminal
Target is denoted as M, and m-th of frequency marker that the CT secondary circuits in fine-tuning process into the electric power terminal are exported is f 'm,
f′m=(f0-△f)+m·H2, f0-△f≤f′m≤f0+ △ f, 1≤m≤M；△f>0, H2>0；
Step 6, real-time voltage sampling is carried out again for the CT secondary circuits in the electric power terminal, obtain CT secondary circuits and exist
Corresponding CT detections voltage value during each output frequency, each output frequency formed again for CT secondary circuits are detected with CT
Correspondence list between voltage value；
Step 7, in the correspondence list formed in step 6, obtain CT secondary circuits highest CT detection voltage value and
The output frequency of corresponding highest CT detections voltage value, and to correspond to the output frequencies of highest CT detection voltage values as CT bis- times
Fine tuning resonance dot frequency of the circuit in fine-tuning process；Wherein, the highest CT of CT secondary circuits described in the step 7 is marked to detect
Voltage value is VOpen；Fine tuning resonance dot frequency of the CT secondary circuits in fine-tuning process is f '0；
Step 8, the CT secondary circuits in the electric power terminal are under short-circuit condition, the CT into the electric power terminal bis- times
The fine tuning resonance dot frequency of circuit input step 7, and it is right under the fine tuning resonance dot frequency to obtain the CT secondary circuits
The CT detection voltage values answered；Wherein, the CT secondary circuit of the mark under short-circuit condition is under the fine tuning resonance dot frequency
Corresponding CT detections voltage value is VShort；
Step 9, in normal operation, the CT secondary circuits into electric power terminal inject the fine tuning to the electric power terminal
It shakes dot frequency, obtains current CT detection voltage value of the CT secondary circuits under current state；Wherein, the CT secondary circuits are marked
Current CT detection voltage values under current state are VCur, current power terminal of the CT secondary circuits under current state
Input current value is ICur；
Step 10, the highest CT according to the CT secondary circuits in step 7 detects gained CT in voltage value, step 8 and detects electricity
The current CT detections voltage value of gained is judged in pressure value and step 9, the current state of the CT secondary circuits is judged, to obtain
Know the CT secondary circuits currently with the presence or absence of stolen risk：
As the current CT detection voltage values VCur>VOpenα and the current power terminal input current value ICur<IThe,Open
When, judge that the CT secondary circuits are currently at open-circuit condition, the CT secondary circuits have stolen risk；Wherein, the α
Represent the CT open circuit proportion threshold values of CT secondary circuits, IThe,OpenRepresent the CT secondary circuits under open-circuit condition in fine tuning resonance point frequency
Rate f '0When corresponding CT open-circuit currents threshold value；
As the current CT detection voltage values VCur<(VShort+(VOpen-VShort) β) and the current power terminal input current
Value ICur<IThe,ShortWhen, judge that the CT secondary circuits are currently at short-circuit condition, the CT secondary circuits have stolen electric wind
Danger；Wherein, the β represents the CT short circuit proportion threshold values of CT secondary circuits, IThe,ShortRepresent the CT secondary circuits under short-circuit condition
In fine tuning resonance dot frequency f '0When corresponding CT short circuit current flows threshold value；
When the CT secondary circuits are not currently in open-circuit condition and are not at short-circuit condition, judge that the CT secondary circuits are worked as
Preceding to be in normal electricity consumption state, stolen risk is not present in the CT secondary circuits.
2. the CT secondary circuit power theft monitoring methods based on frequency-selecting according to claim 1, which is characterized in that the CT bis- times
The CT open circuit proportion threshold value α ∈ [0.75,0.85] in circuit, the CT open-circuit currents threshold value 0<IThe,Open<IIt is specified0.5%, IIt is specified
For the load current value of the electric power terminal.
3. the CT secondary circuit power theft monitoring methods based on frequency-selecting according to claim 2, which is characterized in that the CT bis- times
CT open circuit proportion threshold values α=0.8 in circuit.
4. the CT secondary circuit power theft monitoring methods based on frequency-selecting according to Claims 2 or 3, which is characterized in that the CT
The CT short circuit ratio threshold value beta ∈ [0.25,0.35] of secondary circuit, the CT short circuit current flows threshold value IThe,Short=IIt is specified+ △ I, IIt is specified
For the load current value of the electric power terminal, △ I → 0+。
5. the CT secondary circuit power theft monitoring methods based on frequency-selecting according to claim 4, which is characterized in that the CT bis- times
CT short circuit ratios threshold value beta=0.3 in circuit.
6. the CT secondary circuit power theft monitoring methods based on frequency-selecting according to claim 4, which is characterized in that the CT short circuits
Current threshold IThe,Short=IIt is specified, IIt is specifiedFor the load current value of the electric power terminal.
7. the CT secondary circuit power theft monitoring methods based on frequency-selecting according to claim 1, which is characterized in that further include：Sentence
When the CT secondary circuits in the electric power terminal that break are currently at open-circuit condition, the electric power terminal makes the step of alarm
Suddenly.
8. the CT secondary circuit power theft monitoring methods based on frequency-selecting according to claim 1, which is characterized in that further include：Sentence
When the CT secondary circuits in the electric power terminal that break are currently at short-circuit condition, the electric power terminal makes the step of alarm
Suddenly.
9. the CT secondary circuit power theft monitoring methods based on frequency-selecting according to claim 7 or 8, which is characterized in that the report
It is alert to prompt for audible alarm prompting or light warning prompting or the prompting of sound light warning.
10. the CT secondary circuit power theft monitoring methods based on frequency-selecting according to claim 1, which is characterized in that export to institute
The output frequency of CT secondary circuits in electric power terminal is stated to export for the electric power terminal.
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