CN109507529A - Small current grounding fault based on fault detector differentiates localization method - Google Patents
Small current grounding fault based on fault detector differentiates localization method Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
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Abstract
The invention discloses a kind of, and the small current grounding fault based on fault detector differentiates localization method, including people's acquisition unit clock synchronization and synchronization；Acquisition unit is synchronous to be triggered and acquires electric current and voltage；Zero-sequence current, residual voltage and residual voltage are calculated to the derivative value of time；The zero-sequence current transient state polar character value and residual voltage for calculating fault moment are to the transient state polar character value of the derivative value of time；It calculates the small current grounding fault characteristic value of each fault detector and judges whether to break down；The position of the small current grounding fault of generation is positioned.The method of the present invention collects unit and acquisition unit judgement small current grounding fault by local, analyze to a large amount of recorder datas by complicated algorithm without long-range main website carrying out Earth design；Error code problem and the cost problem of high data traffic caused by being solved simultaneously because of the transmission of a large amount of recorder datas.
Description
Technical field
Present invention relates particularly to a kind of, and the small current grounding fault based on fault detector differentiates localization method.
Background technique
With the development and improvement of living standard of economic technology, people require Reliability of Power Supplying Net Work higher and higher.
It is short trouble and ground fault that power distribution network, which breaks down at most, at present.Short trouble because of fault characteristic clearly, therefore mesh
It is preceding very high to the success rate of short trouble detection.But ground fault, especially small current grounding fault, failure are special
Property is unobvious, and the transient state duration is short, becomes a big difficulty of fault location in distribution.
Currently, the small current neutral grounding localization method of mainstream has applies signal source method and transient state waveform recording method outside.Signal source method is applied outside
By the way that a signal source is added at substation exit, injected outside one by determining zero-sequence current imbalance to ground path
Signature waveform is applied, signal indicator is applied outside route where allowing and detects ground signalling, to complete ground connection positioning.Such method
Disadvantage is to need one signal source of installation that has a power failure by force in power grid, and the stability of signal source itself can be brought to place power grid
The risk of secondary failure.Transient state waveform recording method is synthesized zero-sequence current, is then passed through by the electric current of acquisition touchdown time each test point
The transient characterisitics of each test point zero-sequence current are compared to complete ground connection positioning.The shortcomings that such method, needs for a large amount of recorder data
It to be uploaded to main website by GPRS network, it is higher to the stability of network, requirement of real-time, and a large amount of data transmission needs
Flow cost.
Summary of the invention
The purpose of the present invention is to provide the generations that one kind can accurately differentiate small current grounding fault, and can be accurate right
The small current grounding fault based on fault detector that the abort situation of small current grounding fault is positioned differentiates localization method.
This small current grounding fault differentiation localization method based on fault detector provided by the invention, including people are as follows
Step:
S1. the acquisition unit of the fault detector of each phase is set time, while the acquisition unit of each phase is to mutual
Current sample point position and voltage sample point position synchronize；
S2. the synchronous triggering of the acquisition unit of each phase, and acquire the current data and voltage data of each phase in the failure period；
S3. according to the current data and voltage data of the step S2 each phase obtained, zero-sequence current, residual voltage and zero are calculated
Derivative value of the sequence voltage to the time；
S4. the zero sequence of fault moment is calculated to the derivative of time according to the obtained zero-sequence current of step S3 and residual voltage
The transient state polar character value of current temporary state polar character value and residual voltage to the derivative value of time；
S5. according to the obtained sequence current temporary state polar character value of step S4 and residual voltage to the transient state of the derivative value of time
Polar character value, calculates the small current grounding fault characteristic value of each fault detector, and judges whether that low current, which has occurred, to be connect
Earth fault；
S6. according to the small current grounding fault characteristic value of the obtained fault detector of step S5 and fault detector
Installation site positions the position of the small current grounding fault of generation.
Synchronization described in step S1, the specially synchronization of three-phase current and the synchronous of three-phase voltage and three-phase current and three
The synchronization of phase voltage.
Triggering described in step S2, specially failure mutually trigger expense failure phase or non-faulting mutually triggers failure phase.
Trigger condition includes voltage decline, voltage rises and current break.
Calculating zero-sequence current and residual voltage described in step S3 specially carry out the current value of three-phase synchronous sampled point
Cumulative summation carries out cumulative summation to calculate zero-sequence current, to the voltage value of three-phase synchronous sampled point to calculate zero sequence electricity
Pressure.
Calculating residual voltage described in step S3 specially calculates derivative value using following formula to the derivative value of time:
F (n) is derivative value of the residual voltage to the time in formula, and A [n] and A [n-1] are the zero sequence of two adjacent sampled points
Voltage value, Δ T are the sampling time interval of adjacent sampled point.
The zero-sequence current transient state polar character value of fault moment is calculated described in step S4 and residual voltage leads the time
The transient state polar character value of numerical value is specially calculated using following steps:
A. the polar extreme value of transient state (maximum value of absolute value) and residual voltage for calculating zero-sequence current are to the derivative of time
The polar extreme value of the transient state of value (maximum value of absolute value)；
B. the zero-sequence current transient state polar character value and residual voltage for calculating fault moment using following rule are to the time
The transient state polar character value of derivative value:
If the polar extreme value of the transient state of zero-sequence current is positive value, zero-sequence current transient state polar character value is 1；
If the polar extreme value of the transient state of zero-sequence current is negative value, zero-sequence current transient state polar character value is -1；
If residual voltage is positive value, derivative of the residual voltage to the time to the polar extreme value of the transient state of the derivative value of time
The transient state polar character value of value is 1；
If residual voltage is negative value, derivative of the residual voltage to the time to the polar extreme value of the transient state of the derivative value of time
The transient state polar character value of value is -1.
The small current grounding fault characteristic value of each fault detector of calculating described in step S5, is specially calculated using following
Formula calculates small current grounding fault characteristic value fault eigenvalue:
F=CI+CU
F is the small current grounding fault characteristic value of fault detector, C in formulaIFor zero-sequence current transient state polar character value, CU
It is residual voltage to the transient state polar character value of the derivative value of time.
Judge whether that small current grounding fault has occurred described in step S5, specially judged using following rule:
If the small current grounding fault characteristic value of fault detector is 0, small current grounding fault is had occurred in identification；
If the small current grounding fault characteristic value of fault detector is not 0, assert and small current grounding fault does not occur.
The position of the small current grounding fault of generation described in step S6 is positioned, and is specially carried out using following rule
Positioning:
If in two adjacent fault detectors, the small current grounding fault characteristic value of a fault detector is 0, and another
The small current grounding fault characteristic value of one fault detector is not 0, then assert that small current grounding fault occurs in this two events
Between the installation site for hindering indicator.
This small current grounding fault based on fault detector provided by the invention differentiates localization method, by obtaining event
The electric current of Downtime section three-phase synchronous and and voltage data, obtain current temporary state polarity and voltage derivative transient state by data processing
Polarity finally according to both polar relationships determines whether that small current grounding fault has occurred.The method of the present invention passes through this
Ground collects unit and acquisition unit determines small current grounding fault, without long-range main website by complicated algorithm to a large amount of recorder datas
It is analyzed and carries out Earth design；Error code problem and high number caused by being solved simultaneously because of the transmission of a large amount of recorder datas
According to the cost problem of flow.
Detailed description of the invention
Fig. 1 is the method flow schematic diagram of the method for the present invention.
Fig. 2 is the line construction schematic diagram of the embodiment one of the method for the present invention.
Specific embodiment
It is as shown in Figure 1 the method flow schematic diagram of the method for the present invention: provided by the invention this based on fault detector
Small current grounding fault differentiate localization method, including people's following steps:
S1. the acquisition unit of the fault detector of each phase is set time, while the acquisition unit of each phase is to mutual
Current sample point position and voltage sample point position synchronize；Mainly the synchronization of three-phase current is synchronous with three-phase voltage
And three-phase current is synchronous with three-phase voltage；
Specifically, ensuring sampling point position at any one time, the electric current of three-phase is synchronous with electric field data, such as
Synchronization accuracy is within 100us；
S2. the synchronous triggering of the acquisition unit of each phase, and acquire the current data and voltage data of each phase in the failure period；It can
In such a way that use failure mutually triggers expense failure phase or non-faulting mutually triggers failure phase；
Specifically, the mode of triggering can be triggered by any phase or three-phase while be triggered, if by wherein a certain phase triggering,
Then non-toggle phase is mutually notified to obtain corresponding synchrodata by triggering, the condition of triggering can be voltage change or electric current becomes
Change；
S3. according to the current data and voltage data of the step S2 each phase obtained, zero-sequence current, residual voltage and zero are calculated
Derivative value of the sequence voltage to the time；
Calculate zero-sequence current and residual voltage, specially to the current value of three-phase synchronous sampled point carry out cumulative summation to
Zero-sequence current is calculated, cumulative summation is carried out to calculate residual voltage to the voltage value of three-phase synchronous sampled point；
Residual voltage is calculated to the derivative value of time, derivative value is specially calculated using following formula:
F (n) is derivative value of the residual voltage to the time in formula, and A [n] and A [n-1] are the zero sequence of two adjacent sampled points
Voltage value, Δ T are the sampling time interval of adjacent sampled point；
S4. the zero sequence of fault moment is calculated to the derivative of time according to the obtained zero-sequence current of step S3 and residual voltage
The transient state polar character value of current temporary state polar character value and residual voltage to the derivative value of time；Specially use following steps
It is calculated:
A. the polar extreme value of transient state (maximum value of absolute value) and residual voltage for calculating zero-sequence current are to the derivative of time
The polar extreme value of the transient state of value (maximum value of absolute value)；
B. the zero-sequence current transient state polar character value and residual voltage for calculating fault moment using following rule are to the time
The transient state polar character value of derivative value:
If the polar extreme value of the transient state of zero-sequence current is positive value, zero-sequence current transient state polar character value is 1；
If the polar extreme value of the transient state of zero-sequence current is negative value, zero-sequence current transient state polar character value is -1；
If residual voltage is positive value, derivative of the residual voltage to the time to the polar extreme value of the transient state of the derivative value of time
The transient state polar character value of value is 1；
If residual voltage is negative value, derivative of the residual voltage to the time to the polar extreme value of the transient state of the derivative value of time
The transient state polar character value of value is -1；
S5. according to the obtained sequence current temporary state polar character value of step S4 and residual voltage to the transient state of the derivative value of time
Polar character value, calculates the small current grounding fault characteristic value of each fault detector, and judges whether that low current, which has occurred, to be connect
Earth fault；
Small current grounding fault characteristic value fault eigenvalue is specially calculated using following formula:
F=CI+CU
F is the small current grounding fault characteristic value of fault detector, C in formulaIFor zero-sequence current transient state polar character value, CU
It is residual voltage to the transient state polar character value of the derivative value of time；
And judged using following rule:
If the small current grounding fault characteristic value of fault detector is 0, small current grounding fault is had occurred in identification；
If the small current grounding fault characteristic value of fault detector is not 0, assert and small current grounding fault does not occur.
S6. according to the small current grounding fault characteristic value of the obtained fault detector of step S5 and fault detector
Installation site positions the position of the small current grounding fault of generation；Specially positioned using following rule:
If in two adjacent fault detectors, the small current grounding fault characteristic value of a fault detector is 0, and another
The small current grounding fault characteristic value of one fault detector is not 0, then assert that small current grounding fault occurs in this two events
Between the installation site for hindering indicator.
It is illustrated in figure 2 the line construction schematic diagram of the embodiment one of the method for the present invention: if in test point 3-2 and test point
Small current grounding fault occurs between 3-3, then has:
Test point 3-1:F3-1=CI 3-1+CU′ 3-1=0；
Test point 3-2:F3-2=CI 3-2+CU′ 3-2=0；
Test point 3-3:F3-3=CI 3-3+CU′ 3-3！=0；
Test point 1-1:F1-1=CI 1-1+CU′ 1-1！=0；
Test point 1-2:F1-2=CI 1-2+CU′ 1-2！=0；
Test point 2-1:F2-1=CI 2-1+CU′ 2-1！=0；
Test point 2-2:F2-2=CI 2-2+CU′ 2-2！=0；
Conversely, can determine that if relation above is set up: small current neutral grounding occurs between test point 3-2 and test point 3-3
Failure.
After test point 3-1 and test point 3-2 determine ground fault, collect unit wireless notice voltage decline place
The corresponding fault detector local flashing light of phase, and long-range main website is notified by GPRS network, which has occurred ground connection event
Barrier.The ground fault information and corresponding topological structure of electric that main website is reported according to each test point, determine earthing position
Place is finally completed Earth design.
Claims (10)
1. a kind of small current grounding fault based on fault detector differentiates localization method, including people's following steps:
S1. the acquisition unit of the fault detector of each phase is set time, while the acquisition unit of each phase is to mutual electricity
Stream sampling point position and voltage sample point position synchronize；
S2. the synchronous triggering of the acquisition unit of each phase, and acquire the current data and voltage data of each phase in the failure period；
S3. according to the current data and voltage data of the step S2 each phase obtained, zero-sequence current, residual voltage and zero sequence electricity are calculated
Press the derivative value to the time；
S4. the zero-sequence current of fault moment is calculated to the derivative of time according to the obtained zero-sequence current of step S3 and residual voltage
The transient state polar character value of transient state polar character value and residual voltage to the derivative value of time；
S5. according to the obtained sequence current temporary state polar character value of step S4 and residual voltage to the transient state polarity of the derivative value of time
Characteristic value, calculates the small current grounding fault characteristic value of each fault detector, and judges whether that small current neutral grounding event has occurred
Barrier；
S6. according to the installation of the small current grounding fault characteristic value of the obtained fault detector of step S5 and fault detector
Position positions the position of the small current grounding fault of generation.
2. the small current grounding fault according to claim 1 based on fault detector differentiates localization method, feature exists
The synchronization described in step S1, the specially synchronization of three-phase current and the synchronous of three-phase voltage and three-phase current and three-phase voltage
Synchronization.
3. the small current grounding fault according to claim 1 based on fault detector differentiates localization method, feature exists
The triggering described in step S2, specially failure mutually trigger expense failure phase or non-faulting mutually triggers failure phase.
4. the small current grounding fault according to claim 2 based on fault detector differentiates localization method, feature exists
In trigger condition includes voltage decline, voltage rises and current break.
5. the small current grounding fault according to claim 1 based on fault detector differentiates localization method, feature exists
Calculating zero-sequence current and residual voltage described in step S3 specially carry out cumulative ask to the current value of three-phase synchronous sampled point
To calculate zero-sequence current, cumulative summation is carried out to calculate residual voltage to the voltage value of three-phase synchronous sampled point.
6. the small current grounding fault according to claim 1 based on fault detector differentiates localization method, feature exists
The calculating residual voltage described in step S3 specially calculates derivative value using following formula to the derivative value of time:
F (n) is derivative value of the residual voltage to the time in formula, and A [n] and A [n-1] are the residual voltage of two adjacent sampled points
Value, Δ T are the sampling time interval of adjacent sampled point.
7. the small current grounding fault described according to claim 1~one of 6 based on fault detector differentiates localization method,
It is characterized in that calculating the zero-sequence current transient state polar character value of fault moment described in step S4 and residual voltage leads the time
The transient state polar character value of numerical value is specially calculated using following steps:
A. the polar extreme value of transient state and residual voltage for calculating zero-sequence current are to the polar extreme value of the transient state of the derivative value of time；
B. use the following regular zero-sequence current transient state polar character value for calculating fault moment and residual voltage to the derivative of time
The transient state polar character value of value:
If the polar extreme value of the transient state of zero-sequence current is positive value, zero-sequence current transient state polar character value is 1；
If the polar extreme value of the transient state of zero-sequence current is negative value, zero-sequence current transient state polar character value is -1；
If residual voltage is positive value to the polar extreme value of the transient state of the derivative value of time, residual voltage is to the derivative value of time
Transient state polar character value is 1；
If residual voltage is negative value to the polar extreme value of the transient state of the derivative value of time, residual voltage is to the derivative value of time
Transient state polar character value is -1.
8. the small current grounding fault according to claim 7 based on fault detector differentiates localization method, feature exists
The small current grounding fault characteristic value of each fault detector of calculating, is specially calculated using following formula described in step S5
Small current grounding fault characteristic value fault eigenvalue:
F=CI+CU
F is the small current grounding fault characteristic value of fault detector, C in formulaIFor zero-sequence current transient state polar character value, CUIt is zero
Transient state polar character value of the sequence voltage to the derivative value of time.
9. the small current grounding fault according to claim 8 based on fault detector differentiates localization method, feature exists
Judge whether that small current grounding fault has occurred described in the step S5, specially be judged using following rule:
If the small current grounding fault characteristic value of fault detector is 0, small current grounding fault is had occurred in identification；
If the small current grounding fault characteristic value of fault detector is not 0, assert and small current grounding fault does not occur.
10. the small current grounding fault according to claim 9 based on fault detector differentiates localization method, feature exists
The position of the small current grounding fault of the generation described in step S6 is positioned, and is specially positioned using following rule:
If in two adjacent fault detectors, the small current grounding fault characteristic value of a fault detector is 0, and another
The small current grounding fault characteristic value of fault detector is not 0, then assert that small current grounding fault generation refers in two failures
Show between the installation site of device.
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| CN112433178A (en) * | 2020-12-03 | 2021-03-02 | 石家庄科林电气股份有限公司 | Line fault detection method for synchronous synthesis of data among multiple devices |
| CN113804979A (en) * | 2021-09-03 | 2021-12-17 | 青岛鼎信通讯股份有限公司 | Lightning waveform identification method based on feeder terminal |
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