CN110376481A - Low voltage failure sensor and method are based on edge calculations low voltage failure detection system - Google Patents
Low voltage failure sensor and method are based on edge calculations low voltage failure detection system Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 24
- 238000004364 calculation method Methods 0.000 title claims abstract description 13
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- 230000035772 mutation Effects 0.000 claims abstract description 39
- 238000004891 communication Methods 0.000 claims abstract description 20
- 230000015556 catabolic process Effects 0.000 claims abstract description 18
- 238000005070 sampling Methods 0.000 claims abstract description 5
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- 238000011144 upstream manufacturing Methods 0.000 claims description 6
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- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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Abstract
The invention discloses a kind of low voltage failure sensor and method, it is based on edge calculations low voltage failure detection system, low voltage failure sensor includes sampling unit, breakdown judge unit and communication unit；The acquisition unit, breakdown judge unit and communication unit connect two-by-two respectively；The acquisition unit is for successively acquiring upper power information, abrupt information and the outage information of route；The breakdown judge unit is used for upper power information, abrupt information and the outage information of the route according to acquisition, compared with preset upper electrical parameter, mutation parameter and power failure parameter carry out condition, judges whether to break down；If the communication unit for breaking down, is expressed by signal of communication alarm.This low voltage failure sensor is by detecting upper power information, abrupt information and the outage information in route, to in all directions, accurate judgement line fault point, and fault message alarm is expressed to user, so that user obtains line fault information at the first time.
Description
Technical field
The present invention relates to fault detection technique field more particularly to a kind of low voltage failure sensor and method, it is based on edge
Calculate low voltage failure detection system.
Background technique
With the development of society, the progress in epoch, electricity is ubiquitous with us, and power grid also becomes increasingly complex；But
Also already its failure difficulty detection, abort situation doubt awkward situation while power grid complexity.
Existing low voltage failure sensor is mainly used for the fault detection and location of power distribution station, applies more platform at present
The product of area's fault detection and location, by distribution main website, distribution transformer terminals, branch monitors terminal composition, although the production of this scheme
Product can also complete the fault detection capability of certain function, but at the scene apply when still have more problem, such as: branch monitoring
Terminal is using double mutual inductors, and structure is complicated for this double mutual inductors, and installation is inconvenient.
And there are breakdown judges to be not allowed for existing low voltage failure sensor, usually judges by accident, causes very big loss.
Summary of the invention
In view of this, low voltage failure sensor of the invention and method, it is based on edge calculations low voltage failure detection system, this
Low voltage failure sensor by being detected to upper power information, abrupt information and the outage information in route, thus in all directions,
Accurate judgement line fault point.
A kind of low voltage failure sensor, including sampling unit, breakdown judge unit and communication unit；The acquisition is single
Member, breakdown judge unit and communication unit connect two-by-two respectively；
The acquisition unit is for successively acquiring upper power information, abrupt information and the outage information of route；
The breakdown judge unit is used for upper power information, abrupt information and the outage information of the route according to acquisition, with
Preset upper electrical parameter, mutation parameter and power failure parameter carry out condition comparison, judge whether to break down；
If the communication unit for breaking down, is expressed by signal of communication alarm.
Preferably, the breakdown judge unit includes the first judging unit, second judgment unit and third judging unit,
First judging unit, second judgment unit and third judging unit are sequentially connected；
First judging unit is used to for the upper power information of the route of acquisition being compared with default upper electrical parameter, judges
Whether power-up conditions are met；
If meeting power-up conditions, the abrupt information for the route that the second judgment unit is used to acquire and default mutation letter
Breath is compared, and judges whether to meet sudden change conditions；
If meeting sudden change conditions, the outage information for the route that the third judging unit is used to acquire and the default letter that has a power failure
Breath is compared, and judges whether to meet power failure condition, if meeting power failure condition, judges to break down.
Preferably, the upper power information is the size of current I1 or voltage swing U1 of route, the default upper electrical parameter
For predetermined current i1 or predeterminated voltage u1；The power-up conditions are I1 > i1 or U1 > u1.
Preferably, the abrupt information is mutation current Δ I and duration T, and the default abrupt information is default
Mutation current Δ i and preset durations t；The sudden change conditions are Δ I > Δ i and T > t.
Preferably, the outage information is power failure electric current I2 and power failure voltage U2, and the default outage information is default
Power failure electric current i2 and default power failure voltage u2；The power failure condition is I2 > i2 and U2 > u2.
A kind of fault detection method, method include:
S1. upper power information, abrupt information and the outage information of route are successively acquired；
S2. according to upper power information, abrupt information and the outage information of the route of acquisition, with preset upper electrical parameter, prominent
Variable element and power failure parameter carry out condition comparison, judge whether to break down；
If S3. breaking down, expressed by aspect alarm.
Preferably, the S2 specifically:
The upper power information of the route of acquisition is compared with default upper electrical parameter, judges whether to meet power-up conditions；
If meeting power-up conditions, the abrupt information of the route of acquisition is compared with default abrupt information, is judged whether
Meet sudden change conditions；
If meeting sudden change conditions, the outage information of the route of acquisition is compared with default outage information, is judged whether
Meet power failure condition, if meeting power failure condition, judges to break down.
One kind be based on edge calculations low voltage failure detection system, the low tension route including dry circuit and branch circuit with
And above-mentioned low voltage failure sensor, electrically the dry circuit on access low tension wire road and branch are electric for the low voltage failure sensor
Lu Zhong；
Described be arranged between dry circuit and the low voltage failure sensor of branch circuit carries out telecommunications by communication unit
Number connection；
The low voltage failure sensor of the branch circuit at the upstream of fault point, electric signal be faulty electric current but not
Decompression；
At the downstream of fault point, electric signal is non-faulty current but loses the low voltage failure sensor of the branch circuit
Pressure；
The low voltage failure sensor that dry circuit is arranged in receives the electric signal of the low voltage failure sensor of branch circuit；
The low voltage failure sensor of the dry circuit is according to the electric signal side of the branch circuit low voltage failure sensor of fault point upstream and downstream
Edge calculates abort situation.
Preferably, fault location information is transmitted to user by the low voltage failure sensor of the dry circuit, and is alerted.
It preferably, further include discharge cock, the discharge cock is arranged on electric line dry circuit and branch circuit, with
The low voltage failure sensor corresponds.
The beneficial effects of the present invention are: this low voltage failure sensor passes through to the upper power information in route, abrupt information
And outage information is detected, thus in all directions, accurate judgement line fault point, and by fault message alarm express to
Family, so that user obtains line fault information at the first time, and low voltage failure sensor structure is small and exquisite, easy for installation；And it will be low
Press fault sensor be applied to low pressure (220V) circuit network in, according to edge calculations technology can accurately calculate circuit network which
It breaks down in place.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly, below will be to needed in embodiment description
Attached drawing is briefly described, it should be apparent that, drawings in the following description are some embodiments of the invention, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of low voltage failure sensor connection schematic diagram；
Fig. 2 is a kind of fault detection method flow diagram；
Fig. 3 is a kind of flow diagram of fault detection method breakdown judge；
Fig. 4 is a kind of low voltage failure sensor fault judging unit connection schematic diagram；
Fig. 5 is a kind of based on edge calculations low voltage failure detecting system schematic diagram.
Appended drawing reference
11 sampling unit, 12 breakdown judge unit
13 communication unit, 31 user's table end
32 feeder pillar, 33 power distribution station
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
It should be appreciated that ought use in this specification and in the appended claims, term " includes " and "comprising" instruction
Described feature, entirety, step, operation, the presence of element and/or component, but one or more of the other feature, whole is not precluded
Body, step, operation, the presence or addition of element, component and/or its set.
It will be further appreciated that the term "and/or" used in description of the invention and the appended claims is
Refer to any combination and all possible combinations of one or more of associated item listed, and including these combinations.
Please refer to Fig. 1 and combine Fig. 4, a kind of low voltage failure sensor, including sampling unit 11, breakdown judge unit 12 with
And communication unit 13；Acquisition unit 11, breakdown judge unit 12 and communication unit 13 connect two-by-two respectively:
Acquisition unit 11, for successively acquiring upper power information, abrupt information and the outage information of route；Wherein, it powers on
Information, abrupt information and outage information are generally three-phase voltage, three-phase current, active power, reactive power in circuit etc.
Analog quantity, such as: line current when powering on of upper power information, line voltage distribution when powering on；It is prominent when the mutation of abrupt information
Time-dependent current, duration when mutation；The line current when power failure of outage information, line voltage distribution when power failure.
Breakdown judge list 12, for upper power information, abrupt information and the power failure according to the collected route of acquisition unit
Information compared with preset upper electrical parameter, mutation parameter and power failure parameter carry out condition judges whether that failure has occurred；One
As, upper power information is the size of current I of route1Or voltage swing U1, presetting upper electrical parameter is predetermined current i1Or it is default
Voltage u1；Wherein, power-up conditions I1> i1Or U1> u1, that is, the size of current I of route when powering on1It is pre- greater than upper electrical parameter
If electric current i1Or the voltage U of route when powering on1Greater than predeterminated voltage u1, then can determine that and meet power-up conditions.Abrupt information is
Mutation current Δ I and duration T, presetting abrupt information is default mutation current Δ i and preset durations t；Wherein,
Sudden change conditions are as follows: Δ I > Δ i and T > t；Mutation current Δ I when being mutated is greater than mutation parameter predetermined current Δ i and dashes forward
It is mutated duration T when change and is greater than preset durations t, then can determine that and meet sudden change conditions.Outage information is to stop when having a power failure
Electric current I2And power failure voltage U2, presetting outage information is default power failure electric current i2And default power failure voltage u2；Power failure condition
For I2> i2And U2> u2, that is, have a power failure when mutation current I2Greater than power failure parameter predetermined current i2And line when having a power failure when having a power failure
The voltage U on road2Greater than predeterminated voltage u2, then can determine that and meet power failure condition.When power-up conditions, sudden change conditions and power failure condition
When meeting simultaneously, that is, it can determine that route produces short circuit or ground fault.
Such as Fig. 4, breakdown judge unit 12 includes that the first judging unit 121, second judgment unit 122 and third judgement are single
Member 123, the first judging unit 121, second judgment unit 122 and third judging unit 123 are sequentially connected, in which:
First judging unit 121 meets power-up conditions for judging whether；When powering on, by collected upper power information with
Preset upper electrical parameter is compared judgement, and upper power information is the size of current I of route1Or voltage swing U1, default to power on ginseng
Number is predetermined current i1Or predeterminated voltage u1；Wherein, power-up conditions I1> i1Or U1> u1, that is, the electricity of route when powering on
Flow size I1Greater than upper electrical parameter predetermined current i1Or the voltage U of route when powering on1Greater than predeterminated voltage u1, then can determine that
Meet power-up conditions；Such as: i1It is set as 1A, u1It is set as 154V, works as I1Greater than 1A or U1Greater than 154V, then may determine that
Upper power information meets power-up conditions out, if I1No more than 1A, and U1No more than 154V, then it may determine that power information is discontented
Sufficient power-up conditions.
Second judgment unit 122 meets sudden change conditions for judging whether；When upper power information meets power-up conditions, sentence
Whether disconnected abrupt information meets sudden change conditions；Abrupt information is mutation current Δ I and duration T, and default abrupt information is
Default mutation current Δ i and preset durations t；Wherein, sudden change conditions are as follows: Δ I > Δ i and T > t；It is prominent when being mutated
Mutation duration T is greater than preset durations t when time-dependent current Δ I is greater than mutation parameter predetermined current Δ i and is mutated, then may be used
Judgement meets sudden change conditions；Such as: Δ i is set as 100A, and t is set as 20 milliseconds, when Δ I be greater than 100A, and T be greater than 20 milli
Second, then it may determine that abrupt information meets sudden change conditions, if Δ I is not more than 100A, and T is not more than 20 milliseconds, then can be with
Judge that abrupt information is unsatisfactory for sudden change conditions.
Third judging unit 123 meets power failure condition for judging whether；When abrupt information meets sudden change conditions, sentence
Whether disconnected outage information meets power failure condition；Outage information is power failure electric current I when having a power failure2And power failure voltage U2, preset and have a power failure
Information is default power failure electric current i2And default power failure voltage u2；Power failure condition is I2> i2And U2> u2, that is, have a power failure when mutation
Electric current I2Greater than power failure parameter predetermined current i2And the voltage U of route when having a power failure when having a power failure2Greater than predeterminated voltage u2, then may be used
Judgement meets power failure condition；Such as: i2It is set as 1A, u2It is set as 66V, works as I1Less than 1A, and U1Less than 66V, then can sentence
Disconnected outage information out meets power failure condition, if I1Not less than 1A, and U1Not less than 66V, then it may determine that power information is discontented
Sufficient power-up conditions.When power-up conditions, sudden change conditions and power failure condition simultaneously meet when, that is, can determine that route produce short circuit or
Ground fault.
Generally, related preset electric current, voltage jump duration parameters are factory setting, do not need live calculating
With setting.However in some cases it may be set according to the actual situation.
Communication unit 13, if being expressed for breaking down by signal of communication alarm.When judgement is out of order, pass through load
Wave, micropower is wireless perhaps RS232/RS485 alarm express and notify user or sound an alarm.
This low voltage failure sensor by being detected to upper power information, abrupt information and the outage information in route,
To in all directions, accurate judgement line fault point, and by fault message alarm express to user so that user at the first time obtain
Line taking road fault message.
It please refers to Fig. 2 and combines Fig. 3, a kind of fault detection method, method includes:
S21. upper power information, abrupt information and the outage information of route are successively acquired；Wherein, upper power information, mutation letter
Breath and outage information are generally the analog quantitys such as three-phase voltage, three-phase current, active power, reactive power in circuit, such as:
Line current when powering on of upper power information, line voltage distribution when powering on；The mutation current when mutation of abrupt information, when mutation
Duration；The line current when power failure of outage information, line voltage distribution when power failure.
S22. according to upper power information, abrupt information and the outage information of the route of acquisition, with preset upper electrical parameter, prominent
Variable element and power failure parameter carry out condition comparison, judge whether to break down；Generally, upper power information is that the electric current of route is big
Small I1Or voltage swing U1, presetting upper electrical parameter is predetermined current i1Or predeterminated voltage u1；Wherein, power-up conditions I1> i1
Or U1> u1, that is, the size of current I of route when powering on1Greater than upper electrical parameter predetermined current i1Or route when powering on
Voltage U1Greater than predeterminated voltage u1, then can determine that and meet power-up conditions.Abrupt information be mutation current Δ I and duration T,
Default abrupt information is default mutation current Δ i and preset durations t；Wherein, sudden change conditions are as follows: Δ I > Δ i and T >
t；Mutation duration T is greater than default when mutation current Δ I when being mutated is greater than mutation parameter predetermined current Δ i and is mutated
Duration t, then can determine that and meet sudden change conditions.Outage information is power failure electric current I when having a power failure2And power failure voltage U2, preset
Outage information is default power failure electric current i2And default power failure voltage u2；Power failure condition is I2> i2And U2> u2, that is, when having a power failure
Mutation current I2Greater than power failure parameter predetermined current i2And the voltage U of route when having a power failure when having a power failure2Greater than predeterminated voltage u2,
It then can determine that and meet power failure condition.When power-up conditions, sudden change conditions and power failure condition meet simultaneously, that is, it can determine that route produces
Short circuit or ground fault are given birth to.
Such as Fig. 3, upper power information, abrupt information and the outage information of route, with preset upper electrical parameter, mutation parameter with
And power failure parameter carries out condition comparison, judges whether to break down, specifically:
S221 judges whether to meet power-up conditions；When powering on, by collected upper power information and preset upper electrical parameter into
Row multilevel iudge, upper power information are the size of current I of route1Or voltage swing U1, presetting upper electrical parameter is predetermined current i1Or
Person's predeterminated voltage u1；Wherein, power-up conditions I1> i1Or U1> u1, that is, the size of current I of route when powering on1Greater than powering on
Parameter predetermined current i1Or the voltage U of route when powering on1Greater than predeterminated voltage u1, then can determine that and meet power-up conditions；Example
Such as: i1It is set as 1A, u1It is set as 154V, works as I1Greater than 1A or U1Greater than 154V, then it may determine that power information meets
Power-up conditions, if I1No more than 1A, and U1No more than 154V, then it may determine that power information is unsatisfactory for power-up conditions.
S222 judges whether to meet sudden change conditions；When upper power information meets power-up conditions, judge whether abrupt information is full
Sufficient sudden change conditions；Abrupt information is mutation current Δ I and duration T, preset abrupt information be default mutation current Δ i with
And preset durations t；Wherein, sudden change conditions are as follows: Δ I > Δ i and T > t；Mutation current Δ I when being mutated is greater than mutation
Parameter predetermined current Δ i and mutation duration T is greater than preset durations t when being mutated, then can determine that and meet sudden change conditions；
Such as: Δ i is set as 100A, and t is set as 20 milliseconds, when Δ I be greater than 100A, and T be greater than 20 milliseconds, then may determine that prominent
Become information and meet sudden change conditions, if Δ I is not more than 100A, and T is not more than 20 milliseconds, then may determine that abrupt information is discontented
Sufficient sudden change conditions.
S223 judges whether to meet power failure condition；When abrupt information meets sudden change conditions, judge whether outage information is full
Sufficient power failure condition；Outage information is power failure electric current I when having a power failure2And power failure voltage U2, presetting outage information is the default electricity that has a power failure
Flow i2And default power failure voltage u2；Power failure condition is I2> i2And U2> u2, that is, have a power failure when mutation current I2Join greater than having a power failure
Number predetermined current i2And the voltage U of route when having a power failure when having a power failure2Greater than predeterminated voltage u2, then can determine that and meet power failure condition；
Such as: i2It is set as 1A, u2It is set as 66V, works as I1Less than 1A, and U1Less than 66V, then it may determine that outage information meets
Power failure condition, if I1Not less than 1A, and U1Not less than 66V, then it may determine that power information is unsatisfactory for power-up conditions.When upper
When electric condition, sudden change conditions and power failure condition meet simultaneously, that is, it can determine that route produces short circuit or ground fault.
Generally, related preset electric current, voltage jump duration parameters are factory setting, do not need live calculating
With setting.However in some cases it may be set according to the actual situation.
If S23. breaking down, expressed by aspect alarm.When judgement is out of order, pass through carrier wave, micropower
Wirelessly or RS232/RS485 alarm is expressed.
One kind being based on edge calculations low voltage failure detection system, and system includes: low including dry circuit and branch circuit
Piezoelectricity route and above-mentioned low voltage failure sensor, low tension route are generally the domestic circuit of 220V, naturally it is also possible to answer
In 380V circuit for industry, several low voltage failure sensors are electrically on the dry circuit and branch circuit of access electric line.
It is arranged between dry circuit and the low voltage failure sensor of branch circuit and electric signal connection, branch's electricity is carried out by communication unit
For the low voltage failure sensor on road at the upstream of fault point, electric signal is faulty electric current but not decompression；Branch circuit it is low
Press fault sensor at the downstream of fault point, electric signal is non-faulty current but decompression；The low pressure event of dry circuit is set
Hinder the electric signal that sensor receives the low voltage failure sensor of branch circuit；The low voltage failure sensor of dry circuit is according to fault point
The electric signal edge calculations of the branch circuit low voltage failure sensor of upstream and downstream are out of order position；The low voltage failure of dry circuit senses
Fault location information is transmitted to user by device, and is alerted.
It further include discharge cock, discharge cock is arranged on electric line dry circuit and branch circuit, passes with low voltage failure
Sensor corresponds.
Fig. 5 is please referred to, is specific low voltage failure detection system, electric line includes total dry circuit of power distribution station 33, point
The branch circuit of the branch circuit of branch case 32 and user's table end 31 next stage again, installs master at the incoming switch of power distribution station
Node low voltage failure sensor F11 installs branched low pressure fault sensor F21, F22, F23, F24 etc. at every outlet switch,
Low voltage failure sensor F31, F32, F33, F34 etc. are installed, every electricity box installation low voltage failure passes at the switch of every feeder pillar
One-to-one discharge cock is arranged in sensor F41, F42 etc., each low voltage failure sensor interlock circuit.Such as figure: assuming that K31 is opened
Close the route outlet short trouble between K41 switch；Upper level K31 switch in fault point detects that fault current, protection act are opened
Tripping is closed, F31 low pressure fault sensor detects fault current, is detected simultaneously by decompression, generates short trouble and mistake
Pressure alarm；Fault current is not detected in next stage K41 switch in fault point, and switch is failure to actuate, F41 low pressure fault sensor
Fault current is not detected, but detects decompression, and generates decompression alarm；F21 and F11 low pressure fault sensor: K31
In the case of protecting normal operation, K31 detects fault current immediate trip, the detection of F21 and F11 low pressure fault sensor
To fault current, decompression is not detected, generates overcurrent alarm；When protection is operating abnormally, overstepping occurs, K11 and K21 may be used
It can trip, F21 and F11 generate short trouble and decompression alarm；Failure and decompression, no alarm letter is not detected in other monitoring points
Breath；The fault message of host node F11 low pressure fault sensor F21, F31, F41 judge that short trouble occurs in F41
Between F31 section.Wherein, by the way that by carrier wave, micropower is wireless, and RS232/RS485 is led between low voltage failure sensor
Letter.Low voltage failure detection system can complete fault location function in host node low voltage failure sensor, the fortune independent of main website
Calculation ability is effectively reduced the spending of main website resource, improves the operational efficiency of fault location system.
The embodiment of the present invention can be sequentially adjusted, merged and deleted according to actual needs.
This programme is described in detail in embodiment, and specific case used herein is to structural principle of the invention
And embodiment is expounded, above embodiments are merely used to help understand method and its core concept of the invention；Meanwhile
For those of ordinary skill in the art, according to the thought of the present invention, has change in specific embodiments and applications
Become place, in conclusion the contents of this specification are not to be construed as limiting the invention.
Claims (10)
1. a kind of low voltage failure sensor, it is characterised in that: including sampling unit, breakdown judge unit and communication unit；Institute
Acquisition unit, breakdown judge unit and communication unit is stated to connect two-by-two respectively；
The acquisition unit is for successively acquiring upper power information, abrupt information and the outage information of route；
The breakdown judge unit is used for upper power information, abrupt information and outage information according to the route of acquisition, and default
Upper electrical parameter, mutation parameter and power failure parameter carry out condition comparison, judge whether to break down；
If the communication unit for breaking down, is expressed by signal of communication alarm.
2. low voltage failure sensor according to claim 1, it is characterised in that: the breakdown judge unit is sentenced including first
Disconnected unit, second judgment unit and third judging unit, first judging unit, second judgment unit and third judgement
Unit is sequentially connected；
First judging unit is used to for the upper power information of the route of acquisition being compared with default upper electrical parameter, judges whether
Meet power-up conditions；
If meeting power-up conditions, the abrupt information of route that the second judgment unit is used to acquire and default abrupt information into
Row compares, and judges whether to meet sudden change conditions；
If meeting sudden change conditions, the outage information of route that the third judging unit is used to acquire and default outage information into
Row compares, and judges whether to meet power failure condition, if meeting power failure condition, judges to break down.
3. low voltage failure sensor according to claim 2, it is characterised in that: the upper power information is that the electric current of route is big
Small I1Or voltage swing U1, the default upper electrical parameter is predetermined current i1Or predeterminated voltage u1；The power-up conditions are I1
> i1Or U1> u1。
4. low voltage failure sensor according to claim 2, it is characterised in that: the abrupt information is mutation current Δ I
And duration T, the default abrupt information are default mutation current Δ i and preset durations t；The sudden change conditions
For Δ I > Δ i and T > t.
5. low voltage failure sensor according to claim 2, it is characterised in that: the outage information is power failure electric current I2With
And power failure voltage U2, the default outage information is default power failure electric current i2And default power failure voltage u2；The power failure condition is
I2> i2And U2> u2。
6. a kind of fault detection method, it is characterised in that: method includes:
S1. upper power information, abrupt information and the outage information of route are successively acquired；
S2. according to upper power information, abrupt information and the outage information of the route of acquisition, join with preset upper electrical parameter, mutation
Several and power failure parameter carries out condition comparison, judges whether to break down；
If S3. breaking down, expressed by aspect alarm.
7. fault detection method according to claim 6, it is characterised in that: the S2 specifically:
The upper power information of the route of acquisition is compared with default upper electrical parameter, judges whether to meet power-up conditions；
If meeting power-up conditions, the abrupt information of the route of acquisition is compared with default abrupt information, judges whether to meet
Sudden change conditions；
If meeting sudden change conditions, the outage information of the route of acquisition is compared with default outage information, judges whether to meet
Power failure condition is judged to break down if meeting power failure condition.
8. one kind is based on edge calculations low voltage failure detection system, it is characterised in that: low including dry circuit and branch circuit
Piezoelectricity route and any low voltage failure sensor of claim 1-5, electrically access is low for the low voltage failure sensor
In the dry circuit and branch circuit of piezoelectricity route；
Described be arranged between dry circuit and the low voltage failure sensor of branch circuit carries out electric signal company by communication unit
It connects；
At the upstream of fault point, electric signal is faulty electric current but does not lose the low voltage failure sensor of the branch circuit
Pressure；
For the low voltage failure sensor of the branch circuit at the downstream of fault point, electric signal is non-faulty current but decompression；
The low voltage failure sensor that dry circuit is arranged in receives the electric signal of the low voltage failure sensor of branch circuit；It is described
The low voltage failure sensor of dry circuit is according to the electric signal edge meter of the branch circuit low voltage failure sensor of fault point upstream and downstream
Calculate abort situation.
9. according to claim 8 be based on edge calculations low voltage failure detection system, it is characterised in that: the dry circuit
Fault location information is transmitted to user by low voltage failure sensor, and is alerted.
10. according to claim 8 be based on edge calculations low voltage failure detection system, it is characterised in that: further include insurance
Switch, the discharge cock are arranged on electric line dry circuit and branch circuit, a pair of with the low voltage failure sensor one
It answers.
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Application publication date: 20191025 |