CN201707384U - Residual current monitoring alarm system and detection controller - Google Patents

Abstract

The utility model provides a residual current monitoring alarm system and a detection controller. The detection controller comprises a collection processing unit, a statistical analyzing unit, a threshold generating unit and a monitoring alarm unit, wherein the collection processing unit is used for receiving the collected load current value and residual current value, and generating and storing the residual current relative value according to the collected three-phase load current value and residual current value; the statistical analyzing unit is used for carrying out statistical analysis on a plurality of residual current relative values in the preset time, and generating and storing the statistics parameters of the residual current relative values; the threshold generating unit is used for generating the alarm threshold of the monitoring time point according to the residual current relative values and statistics parameters stored before the time point is monitored; and the monitoring alarm unit is used for carrying out monitoring alarm on the residual current of the monitoring loop according to the generated alarm threshold. The utility model can avoid the missed alarm and false alarm generated by the traditional fixed alarming threshold.

Description

Residual current monitoring warning system and detection controller

Technical field

The utility model relates to residual-current electrical fire monitoring technique field, particularly a kind of residual current monitoring warning system and detection controller.

Background technology

The residual-current electrical fire supervisory system is a new product that occurred in recent years, is arranged in the low-voltage distribution system, and Core Feature is for taking precautions against electrical fire.In view of the obvious lifting of fire consciousness is taken precautions against by the severe situation and the various circles of society of the nearly more than ten years electrical fire of China, the application development of residual-current electrical fire monitoring and alarming system is very fast, and especially the application in public building and skyscraper is very general.The residual-current electrical fire supervisory system has progressively obtained the approval of each side in the effect aspect the electrical fire taken precautions against, and has extraordinary application prospect.

The residual-current electrical fire supervisory system is the residual current in the protected loop of monitoring in real time, in case the residual current that detects surpasses the alarm threshold value of setting, then sends alerting signal, and alarm principle is very simple.Exactly because also alarm algorithm is simple, there is not intelligentized consideration, the residual-current electrical fire supervisory system is existing no small defective aspect warning accuracy, the reliability, have the situation of failing to report alert and false alarm in actual the use, must carry out perfect.

Existing residual-current electrical fire supervisory system adopts fixedly this simple alarm algorithm of alarm threshold value, is that system false alarm frequently occurs and fails to report alert essential reason.The variation characteristics of the setting of alarm threshold value and the normal residual current of protected distribution system are without any relation, and in case configure, then can't change automatically, must manually reset.

Fixedly alarm threshold value basically has the shortcoming of following two aspects:

(1) alarm threshold value be provided with improper

Fig. 1 is one of prior art residual current alarm principle synoptic diagram.As shown in Figure 1, if alarm threshold value is provided with too high (alarm setting value 2), considerably beyond the maximal value of normal residual current, even distribution system unusual residual current occurred in B point region, but owing to do not surpass alarm threshold value, system can not report to the police, thereby causes failing to report the police; If alarm threshold value was provided with low (alarm setting value 1), when normal residual current increases near the maximal value in the distribution system,, easily cause false alarm again as A point region.

(2) warning sensitivity is inconsistent relatively

Fig. 2 is two of a prior art residual current alarm principle synoptic diagram.If alarm threshold value is defined as relative warning sensitivity (Δ h1 among Fig. 2 and Δ h2) with the difference of normal residual electricity flow valuve, under fixing alarm threshold value situation, its relative warning sensitivity is not constantly to be consistent, but changes along with the normal fluctuation of residual current.Fig. 2 is with reference to threshold value with alarm setting value 1, and A point zone differs bigger with the relative warning sensitivity in B point zone, and this may cause false alarm equally and fail to report the police.During underrun (A point place flat site among Fig. 2),, also may can't report to the police because Δ h1 is excessive even unusual residual current occurred; When heavy-duty service (B point region among Fig. 2), even without unusual residual current, because Δ h2 is too small, the fuctuation within a narrow range of normal residual current also may cause reporting to the police.

As seen through the above analysis, why prior art exists is failed to report alert and false alarm is determined by the fixing inadequate natural endowment of alarm threshold value, do not change fixedly alarm threshold value algorithm, just can't eliminate the frequent false alarm that occurs of residual-current electrical fire supervisory system and fail to report the police.

The utility model content

The purpose of this utility model provides a kind of residual current monitoring warning system and surveys controller.The technical solution of the utility model can dynamically be determined the residual current alarm threshold value, efficiently solves that prior art is warned owing to failing to report of adopting that fixing alarm threshold value causes and the problem of false alarm.

The utility model one embodiment provides a kind of detection controller, described detection controller comprises: the acquisition process unit, be used to receive the three-phase load current value and the residual electricity flow valuve of collection, according to the three-phase load current value and the residual electricity flow valuve of described collection, generate and store the residual current relative value of each acquisition time point; Statistical analysis unit connects described acquisition process unit, is used for a plurality of residual current relative values in the default duration are carried out statistical study, generates and stores the statistics parameter of described a plurality of residual current relative values; The threshold value generation unit connects described statistical analysis unit, is used for described residual current relative value and described statistics parameter according to storage before the time point of monitoring, generates the alarm threshold value of time point of monitoring; The monitoring alarm unit connects described threshold value generation unit, is used for according to the alarm threshold value that generates the residual current of described monitoring loop being carried out monitoring alarm.

Another embodiment of the utility model provides a kind of residual current monitoring warning system, and described system comprises: Centralized Controller, buses isolator, detection controller, current probe and residual current detector; Described Centralized Controller connects by buses isolator surveys controller; Described detection controller connects described current probe and residual current detector; Described current probe is used to gather the three-phase load electric current; Described residual current detector is used to gather residual current; Described detection controller is used to receive the load current value and the residual electricity flow valuve of collection, according to the load current value and the residual electricity flow valuve of gathering, generates and stores the residual current relative value of each acquisition time point; A plurality of residual current relative values in the default duration are carried out statistical study, generate and store the statistics parameter of described a plurality of residual current relative values; According to the described residual current relative value and the described statistics parameter of storage before the time point of monitoring, generate the alarm threshold value of time point of monitoring; According to the alarm threshold value that generates the residual current of described monitoring loop is carried out monitoring alarm.

Residual current monitoring warning system of the present utility model and detection controller are come up dynamically to determine alarm threshold value on the basis of intelligence learning, taken into full account the own characteristic that the normal residual current of protected object changes.The residual current alarm threshold value that the device that adopts present embodiment and system determine more rationally, also science more, failing to report of can avoiding that existing fixedly alarm threshold value causes warned and false alarm.

Description of drawings

Fig. 1 is one of prior art residual current alarm principle synoptic diagram;

Fig. 2 is two of a prior art residual current alarm principle synoptic diagram;

Fig. 3 is the residual current monitoring warning system schematic diagram of the utility model embodiment;

Fig. 4 is the functional block diagram of the detection controller of the utility model embodiment;

Fig. 5 is the refinement block diagram of threshold value generation unit of the detection controller of the utility model embodiment.

Fig. 6 is the residual current monitoring alarm method overall flow figure of the utility model embodiment;

Fig. 7 is the residual current monitoring alarm principle synoptic diagram of the utility model embodiment;

Fig. 8 is the residual current monitoring alarm method detail flowchart of the utility model embodiment.

Embodiment

For the purpose, technical scheme and the advantage that make the utility model embodiment clearer, below in conjunction with the accompanying drawing among the utility model embodiment, technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.

Embodiment of the present utility model provides a kind of residual current monitoring warning system and surveys controller, and Fig. 3 is the systematic schematic diagram of present embodiment.As shown in Figure 3, the system of present embodiment comprises: Centralized Controller, buses isolator, detection controller, current probe and residual current detector; Centralized Controller connects by buses isolator surveys controller; Survey controller and connect described current probe and residual current detector.

Wherein: the current probe of present embodiment is used to gather the three-phase load electric current; The residual current detector is used to gather residual current; Survey controller, be used to receive the three-phase load electric current and the residual electricity flow valuve of collection,, generate and store the residual current relative value of each acquisition time point according to the load current value and the residual electricity flow valuve of gathering; A plurality of residual current relative values in the default duration are carried out statistical study, generate and store the statistics parameter of described a plurality of residual current relative values; According to the described residual current relative value and the described statistics parameter of storage before the time point of monitoring, generate the alarm threshold value of time point of monitoring; According to the alarm threshold value that generates the residual current of described monitoring loop is carried out monitoring alarm.

Refer again to Fig. 3, wherein: buses isolator, be used for when bus breaks down, the bus portion and the total system that break down are kept apart, can operate as normal with the other parts that guarantee system; Current probe and residual current detector are current transformer, in order to detecting A, B, C three-phase load electric current and the residual current of low-voltage distribution system, and detected numerical value are sent to the detection controller; Centralized Controller and detection controller are the residual-current electrical fire supervisory system parts of core the most.Major loop surveys controller and Zhi Huilu surveys the difference that controller there is no essence, is the installation site difference, and the major loop detector controller is installed in the total power distribution cabinet of distribution system place, and branch road is surveyed controller and then is installed in distribution system branch road panel box place.Centralized Controller is similar to the Centralized Controller of fire alarm system, has the function of compiling all relevant device signals and Long-distance Control, is the main platform of man-machine interaction and parameter setting simultaneously.Survey controller and receive load current and residual current signal, judge whether to report to the police, signal is sent to Centralized Controller by bus, and carries out tripping function where necessary.The detection controller in each loop works alone.

Fig. 4 is the functional block diagram of the detection controller of present embodiment.As shown in Figure 4, this detection controller 40 comprises: acquisition process unit 401, be used to receive the three-phase load current value and the residual electricity flow valuve of collection,, generate and store the residual current relative value of each acquisition time point according to the three-phase load current value and the residual electricity flow valuve of gathering; Statistical analysis unit 402 is used for a plurality of residual current relative values in the default duration are carried out statistical study, generates and stores the statistics parameter of described a plurality of residual current relative values; Threshold value generation unit 403 is used for described residual current relative value and described statistics parameter according to storage before the time point of monitoring, generates the alarm threshold value of time point of monitoring; Monitoring alarm unit 404 is used for according to the alarm threshold value that generates the residual current of described monitoring loop being carried out monitoring alarm.

Alternatively, the default duration of present embodiment comprises one day, and the statistics parameter comprises the standard deviation of a plurality of residual current relative values in a day; The threshold value generation unit 403 of present embodiment comprises (as shown in Figure 5): first generation unit 501, be used for according to the previous day a plurality of acquisition time points the residual current relative value and the standard deviation of the previous day, generate the alarm threshold value of corresponding time point of monitoring on the same day; Second generation unit 502 is used for generating the alarm threshold value of corresponding time point of monitoring on the same day according to residual current relative value before the same day time point of monitoring and the standard deviation of the previous day; The 3rd generates unit 503, be used for according to last week a plurality of acquisition time points on the same day the residual current relative value and last week standard deviation on the same day, the generation same day corresponding time point of monitoring alarm threshold value.

Alternatively, the threshold value generation unit 403 of present embodiment is used for described alarm threshold value and is set to described residual current relative value and described standard deviation sum; Perhaps described alarm threshold value is set to the integral multiple sum of described residual current relative value and described standard deviation.

Alternatively, default duration also comprises intraday a plurality of segmentation period, and the statistics parameter also comprises the mean value and the standard deviation of a plurality of residual current relative values in each segmentation period; The threshold value generation unit 403 of present embodiment also comprises (as shown in Figure 5): determining unit 504, connect first generation unit 501, second generation unit 502 and the 3rd generation unit 503, be used for statistics parameter characteristic according to the described segmentation period, be identified for generating the residual current relative value and the standard deviation of the alarm threshold value of time point of monitoring, generate from first generation unit 501, second generation unit 502 and the 3rd and select one the unit 503 and generate described alarm threshold value.

Alternatively, described acquisition process unit 401, be used to obtain with described residual electricity flow valuve constantly with described three-phase load current vector constantly and ratio, be set to described ratio with the residual current relative value in the moment.

Alternatively, described acquisition process unit 401 also is used for when non-vanishing with residual electricity flow valuve constantly, and when being zero with the vector sum of three-phase load electric current constantly, is set to residual electricity flow valuve with the moment with residual current relative value constantly; Perhaps, when being zero, be set to zero with residual current relative value constantly with constantly residual electricity flow valuve and vector sum with three-phase load electric current constantly.

Alternatively, monitoring alarm unit 404, when being used for residual current relative value when described time point of monitoring greater than described alarm threshold value, stop to upgrade alarm threshold value, continue to judge that whether the residual current relative value of next time point of monitoring is greater than alarm threshold value, if n residual current relative value is all greater than alarm threshold value continuously, then report to the police, wherein n is a positive integer.

Alternatively, monitoring alarm unit 404, the alarm threshold value residual current relative value numerical value partly that also is used for working as the time point of monitoring are less than setting numerical value, and the residual current relative value of time point of monitoring continues to upgrade alarm threshold value greater than alarm threshold value; When N continuous after the time point of monitoring residual current relative value during, then report to the police, otherwise do not report to the police all greater than alarm threshold value.

Alternatively, monitoring alarm unit 404 also is used for when the vector sum of time point of monitoring three-phase load electric current is zero, judges whether the residual electricity flow valuve of this time point surpasses default alarm threshold value, if surpass then warning, otherwise does not report to the police.

Present embodiment also provides a kind of residual current monitoring alarm method, and this method is provided by the residual current monitoring warning system of present embodiment.The servo technology of this system by alarm threshold value makes definite intellectuality of alarm threshold value, and can dynamically adjust, thereby avoid the residual-current electrical fire supervisory system employing false alarm that fixedly alarm threshold value brought and fail to report the alert condition, from improving the reliability and the accuracy of reporting to the police in essence.

The overall flow figure of the residual current monitoring alarm method that Fig. 6 provides for present embodiment.As shown in Figure 6, the method for present embodiment comprises:

S601, current probe are gathered the three-phase load current value in monitored loop, and the residual current detector is gathered the residual electricity flow valuve in monitored loop.

The acquisition process unit 401 of S602, detection controller 40 generates and stores the residual current relative value of each acquisition time point according to the load current value and the residual electricity flow valuve of gathering.

Alternatively, the residual current relative value of present embodiment be with described residual electricity flow valuve constantly with described three-phase load current vector constantly and ratio.

A plurality of residual current relative values in 402 pairs of default durations of statistical analysis unit of S603, detection controller 40 are carried out statistical study, generate and store the statistics parameter of described a plurality of residual current relative values.

Alternatively, the default duration of present embodiment can be one day, and the statistics parameter comprises the standard deviation of a plurality of residual current relative values in a day.

Alternatively, the default duration of present embodiment can also be intraday a plurality of segmentation period, and described statistics parameter also comprises the mean value and the standard deviation of a plurality of residual current relative values in each segmentation period.

The threshold value generation unit 403 of S604, detection controller 40 generates the alarm threshold value of time point of monitoring according to the described residual current relative value and the described statistics parameter of storage before the time point of monitoring.

According to the difference of actual conditions, S604 specifically can comprise: according to the previous day a plurality of acquisition time points the residual current relative value and the standard deviation of the previous day, generate the alarm threshold value of corresponding time point of monitoring on the same day; Perhaps, according to residual current relative value before the same day time point of monitoring and the standard deviation of the previous day, generate the alarm threshold value of corresponding time point of monitoring on the same day; Perhaps, according to last week a plurality of acquisition time points on the same day the residual current relative value and last week standard deviation on the same day, generate the alarm threshold value of corresponding time point of monitoring on the same day.

Alternatively, the alarm threshold value of present embodiment is described residual current relative value and described standard deviation sum; Perhaps, alarm threshold value is the integral multiple sum of described residual current relative value and described standard deviation.

Alternatively, this method also comprises: according to the statistics parameter characteristic of described segmentation period, be identified for generating the residual current relative value and the standard deviation of the alarm threshold value of time point of monitoring, and determine the concrete warning level value generation method that adopts of S604 according to the result who determines.

The monitoring alarm unit 404 of S605, detector 40 carries out monitoring alarm according to the alarm threshold value that generates to the residual current of described monitoring loop.

Alternatively, the S605 of present embodiment specifically can comprise: (1) if the residual current relative value of described time point of monitoring greater than described alarm threshold value, then stop to upgrade alarm threshold value, continue to judge that whether the residual current relative value of next time point of monitoring is greater than alarm threshold value, if n residual current relative value is all greater than alarm threshold value continuously, then report to the police, wherein n is positive integer (as n=3); (2) if the numerical value of residual current relative value part is less than setting numerical value in the alarm threshold value of time point of monitoring, and the residual current relative value of time point of monitoring continues to upgrade alarm threshold value greater than alarm threshold value; When N continuous after the time point of monitoring residual current relative value during, then report to the police, otherwise do not report to the police all greater than alarm threshold value; (3) if when the vector sum of time point of monitoring three-phase load electric current is zero, judge whether the residual electricity flow valuve of this time point surpasses default alarm threshold value,, otherwise do not report to the police if surpass then report to the police.

Method of the present utility model can specifically be divided into intelligence learning process, statistical study process, dynamic adjustment process and Realtime Alerts process.Wherein: (1) intelligence learning process: electric current that intellectual analysis collects and residual current data, filter unreasonable data, and carry out the calculating of residual current relative value.(2) statistical analysis process: introduce the variation characteristics that Principle of Statistics is analyzed the residual current relative value, ask the mean value and the standard deviation of residual current relative value in the different time sections; (3) dynamic adjustment process: consider every day that the residual current relative value embodies and the periodicity that changes weekly, determine alarm threshold value according to residual current relative value mean value and standard deviation, Real-time and Dynamic is adjusted alarm threshold value; (4) Realtime Alerts process: judging whether report to the police is criterion with 1 detected value above alarm setting value no longer, is criterion but surpass alarm setting value with n (as n=3) continuous detecting value.In addition, determine that the used residual current relative value of alarm threshold value is at 0 o'clock, also must include load current in judgement.Below describe the principle of work of each process in detail.

(1) intelligence learning process (Intelligent-Learn), intelligence learning are divided into initial intelligent study and the study of real-time intelligent afterwards.This learning process is realized by acquisition process unit 401.

Initial intelligent learning time is the 1st day 24 hours, for each protected loop, gathers 3 load current data (1 of every phase) and 1 residual current data p.s.; Continued intelligence learning 1 hour in second day, this moment, initial intelligent study was all finished.

Alternatively, in order to guarantee the rationality of data, for the load current and the residual current data of initial intelligent study acquisition in 24 hours, process below carrying out:

A1, filter out irrational three-phase load electric current and residual current data;

B1, filter out after irrational three-phase load electric current and the residual current data, the vacancy that stays, adopts method of interpolation to try to achieve the back and replenishes according to the quantity of vacancy according to each 1 reasonable data before and after the unreasonable data, guarantees the complete of data bulk.

The residual current relative value be meant with constantly residual current value and three-phase load electric current phasor and ratio, be shown below:

$R_{\mathrm{RC}}=\frac{I_{\mathrm{RC}}}{{\stackrel{\·}{I}}_A+{\stackrel{\·}{I}}_B+{\stackrel{\·}{I}}_C}$

In the formula:

R _RC---the residual current relative value;

I _RC---the residual current test value in protected loop, (mA);

---the phasor value of protected loop three-phase load electric current, (A).

Alternatively, in order to guarantee the rationality of data, calculate the residual current relative value and do following consideration:

A2, for image data, if continuous 3 groups of above three-phase load size of current are equal fully, corresponding continuous 3 residual electricity flow valuves are constantly then no longer calculated the residual current relative value greater than zero, preserve corresponding residual electricity flow valuve constantly as the reference judgment value;

B2, for image data, no matter how many composite values of three-phase load electric current be, as long as the residual electricity flow valuve is zero, then the residual current relative value is zero;

The characteristic of C2, consideration different time sections residual current, time segment filters out after irrational residual current relative value data, and the vacancy that stays is according to each 1 reasonable data before and after the unreasonable data, according to the quantity of vacancy, adopt method of interpolation to try to achieve the back and replenish, guarantee the complete of data bulk.

The prerequisite of initial intelligent study is that distribution system is moved in this process normally, does not have the possibility that unusual residual current occurs, could guarantee that like this data that intelligence learning obtains can be used as the unusual basic reference data of judgement.

Real-time intelligent study comprises: the 2nd day the 2nd～24 hour, all carry out the collection of 4 current data p.s., and generate the residual current relative value; P.s. is all carried out the collection of 4 current data in the 3rd day 24 hours, generates the residual current relative value; ...; P.s. is all carried out the collection of 4 current data in the 7th day 24 hours, generates the residual current relative value; The 8th day the 1st hour, all carry out the collection of 4 current data p.s., generate the residual current relative value; The data of gathering in the 8th day the 2nd hour begin to replace the 1st day the 1st hour data, store 7 days 01 hours data altogether.

(2) statistical study process (Statistics-Analysis) is realized by statistical analysis unit 402.

A3, all calculate the residual current relative value of gained in obtain according to initial intelligent study 24 hours, obtain the mean value of the 1st day the 1st hour residual current relative value

And standard deviation sigma _H1/d1Obtain the mean value of the 1st day 2nd hour residual current relative value

And standard deviation sigma _H2/d1...; Mean value up to the 1st day the 24th hour residual current relative value

And standard deviation sigma _H24/d1

B3, obtain the standard deviation sigma of all residual current relative values in the 1st day 24 hours _D1

The mean value of C3, the 2nd day the 1st hour residual current relative value of acquisition

And standard deviation sigma _H1/d2Obtain the mean value of the 2nd day the 2nd hour residual current relative value

And standard deviation sigma _H2/d2...; Mean value up to the 2nd day the 24th hour residual current relative value And standard deviation sigma _H24/d2

D3, obtain the standard deviation sigma of all residual current relative values in the 2nd day 24 hours _D2

Adopt the same method of A3-D3 to obtain the 3rd, 4,5,6 day ASSOCIATE STATISTICS mathematic(al) parameter;

The mean value of E3, the 7th day the 1st hour residual current relative value of acquisition

And standard deviation sigma _H1/d7Obtain the mean value of the 7th day the 2nd hour residual current relative value

And standard deviation sigma _H2/d7...; Mean value up to the 7 24th hour residual current relative value

And standard deviation sigma _H24/d7

F3, obtain the standard deviation sigma of all residual current relative values in the 7th day 24 hours _D7

Wherein, the mean value of residual current relative value in 1st hour

And standard deviation sigma _H1/d1And n in 24 hours _dThe standard deviation sigma of individual residual current relative value _D1Concrete computing formula as follows, the rest may be inferred for remainder formula, no longer repeats to list herein.

${\stackrel{\‾}{R}}_{{\mathrm{RC}}_{h1/d1}}=\frac{\underset{i=1}{\overset{n_h}{\mathrm{\Σ}}}{R}_{R{C}_i}}{n_h}$

${\mathrm{\σ}}_{h1/d1}=\sqrt{\frac{\underset{i=1}{\overset{n_h}{\mathrm{\Σ}}}{(R_{{\mathrm{RC}}_i}-{\stackrel{\‾}{R}}_{{\mathrm{RC}}_{h1/d1}})}^2}{n_h}}$

${\mathrm{\σ}}_{d1}=\sqrt{\frac{\underset{i=1}{\overset{n_d}{\mathrm{\Σ}}}{(R_{{\mathrm{RC}}_i}-{\stackrel{\‾}{R}}_{{\mathrm{RC}}_{d1}})}^2}{n_d}}$

In the formula:

n _h---per hour gather the number of times of one group of data (1 residual current and three-phase current) in theory;

n _d---gather the number of times of one group of data (1 residual current and three-phase current) in theory 24 hours every days;

---all calculated the mean value of the residual current relative value that obtains in the 1st day 1st hour;

---all calculated the mean value of the residual current relative value that obtains in the 1st day 24 hours;

σ _H1/d1---all calculated the standard deviation of the residual current relative value that obtains in the 1st day 1st hour;

σ _D1---all calculated the standard deviation of the residual current relative value that obtains in the 1st day 24 hours.

(3) dynamic adjustment process (Dynamic-Adjusting) is realized by threshold value generation unit 403.

A4, general (

And σ _H1/d2) with (

And σ _H1/d1) carry out consistance relatively (look at difference whether in a scope) if then satisfy coherence request;

If satisfy coherence request, then the 1st alarm threshold value is as follows after the 2nd day the 1st hour:

$A_{{\mathrm{RC}}_{(n_h+1)/d2}}=R_{{\mathrm{RC}}_{(n_h+1)/d1}}+{\mathrm{\σ}}_{d1}$

If do not satisfy coherence request, then the 1st alarm threshold value is as follows after the 2nd day the 1st hour:

$A_{{\mathrm{RC}}_{(n_h+1)/d2}}=R_{{\mathrm{RC}}_{n_h/d2}}+{\mathrm{\σ}}_{d1}$

By that analogy, obtain the 2nd day 1st hour All Alerts threshold value;

B4, general (

And σ _H2/d2) with (

And σ _H2/d1) carry out consistance relatively,

If satisfy coherence request, then the 1st alarm threshold value is as follows after the 2nd day the 2nd hour:

$A_{{\mathrm{RC}}_{({2n}_h+1)/d2}}=R_{{\mathrm{RC}}_{({2n}_h+1)/d1}}+{\mathrm{\σ}}_{d1}$

If do not satisfy coherence request, then the 1st alarm threshold value is as follows after the 2nd day the 1st hour:

$A_{{\mathrm{RC}}_{({2n}_h+1)/d2}}=R_{{\mathrm{RC}}_{{2n}_h/d2}}+{\mathrm{\σ}}_{d1}$

By that analogy, obtain the 2nd day 2nd hour All Alerts threshold value;

……

By that analogy, obtain the 2nd day 24 hours All Alerts threshold value;

After C4, the beginning in the 3rd day, the object of mean value and standard deviation comparison becomes the 2nd day data; Obtain the 3-7 days All Alerts threshold values in each hour by a and the same method of b;

D4, enter the 8th day, will (

And σ _H1/d8) respectively with (

And σ _H1/d7) and ( And σ _H1/d1) carry out consistance relatively;

If (

And σ _H1/d8) with ( And σ _H1/d7) consistance better, then the 1st alarm threshold value is as follows after the 8th day the 1st hour:

$A_{{\mathrm{RC}}_{(n_h+1)/d8}}=R_{R{C}_{(n_h+1)/d7}}+{\mathrm{\σ}}_{d7}$

If ( And σ _H1/d8) with (

And σ _H1/d1) consistance better, then the 1st alarm threshold value is as follows after the 8th day the 1st hour:

$A_{{\mathrm{RC}}_{(n_h+1)/d8}}=R_{R{C}_{(n_h+1)/d1}}+{\mathrm{\σ}}_{d1}$

If two consistance are all bad, then the 1st alarm threshold value is as follows after the 8th day the 1st hour:

$A_{{\mathrm{RC}}_{(n_h+1)/d8}}=R_{R{C}_{(n_h+1)/d8}}+{\mathrm{\σ}}_{d7}$

By that analogy, obtain the 8th day 1st hour All Alerts threshold value;

Program must be stored at least 7 days 01 hours data, just 7n _d+ n _hIndividual residual current relative value, new residual current relative value of every afterwards acquisition then replaces 1 residual current relative value data the earliest.

……

By that analogy, obtain the 8th day 2nd hour All Alerts threshold value ...; Circulation is gone down.

(4) Realtime Alerts process (Real-time-Alarming) is realized by monitoring alarm unit 404.

If the residual current relative value of calculating acquisition is greater than the alarm threshold value of determining, then stop the real-time update alarm threshold value, continue whether to judge next residual current relative value, if continuous 3 residual current relative values all greater than alarm threshold value, are then reported to the police greater than alarm threshold value.

If the numerical value of residual current relative value part is less than setting numerical value in the alarm threshold value of time point of monitoring, and the residual current relative value of time point of monitoring then continues to upgrade alarm threshold value greater than alarm threshold value; When N continuous after the time point of monitoring residual current relative value during, then report to the police, otherwise do not report to the police all greater than alarm threshold value.What this situation was considered is the situation that load switches, and N is relevant with the length of the sample frequency of data and the handoff procedure of loading.

If monitoring three-phase load electric current constantly is zero or equal fully, is alarm threshold value with the residual current relative value no longer, but be the alarm decision value,, then report to the police, otherwise do not report to the police if the residual electricity flow valuve surpasses setting value with the residual electricity flow valuve.

After adopting the method for present embodiment, alarm threshold value changes along with the variation of normal residual current, and its alarm principle as shown in Figure 7.As can be seen, alarm threshold value changes along with the variation of normal residual current, but warning sensitivity is consistent relatively.Fig. 8 is the detail flowchart of the method for the utility model embodiment.

What need statement is: above-mentioned concrete implementation procedure only is used for the utility model is described, and the protection domain that is not used in claim limits.In the above-mentioned specific implementation process, the residual current relative value of alarm threshold value institute foundation and standard deviation can be with one day be the cycle, also can be half a day, or even one hour; The data of storage also can be data of storage one week, two weeks even month or the like.Every protection domain that all belongs to the utility model claim based on the various distortion of the utility model thought.

Above embodiment only in order to the technical scheme of explanation the utility model embodiment, is not intended to limit; Although the utility model embodiment is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of each embodiment technical scheme of the utility model embodiment.

Claims (4)

1. a detection controller is characterized in that, described detection controller comprises:

The acquisition process unit is used to receive the three-phase load current value and the residual electricity flow valuve of collection, according to the three-phase load current value and the residual electricity flow valuve of described collection, generates and stores the residual current relative value of each acquisition time point;

Statistical analysis unit connects described acquisition process unit, is used for a plurality of residual current relative values in the default duration are carried out statistical study, generates and stores the statistics parameter of described a plurality of residual current relative values;

The threshold value generation unit connects described statistical analysis unit, is used for described residual current relative value and described statistics parameter according to storage before the time point of monitoring, generates the alarm threshold value of time point of monitoring;

The monitoring alarm unit connects described threshold value generation unit, is used for according to the alarm threshold value that generates the residual current of described monitoring loop being carried out monitoring alarm.

2. detection controller according to claim 1 is characterized in that, described default duration comprises one day, and described statistics parameter comprises the standard deviation of a plurality of residual current relative values in a day; Described threshold value generation unit comprises:

First generation unit, be used for according to the previous day a plurality of acquisition time points the residual current relative value and the standard deviation of the previous day, generate the alarm threshold value of corresponding time point of monitoring on the same day;

Second generation unit is used for generating the alarm threshold value of corresponding time point of monitoring on the same day according to residual current relative value before the same day time point of monitoring and the standard deviation of the previous day;

The 3rd generates the unit, be used for according to last week a plurality of acquisition time points on the same day the residual current relative value and last week standard deviation on the same day, the generation same day corresponding time point of monitoring alarm threshold value.

3. detection controller according to claim 2 is characterized in that, described default duration also comprises intraday a plurality of segmentation period, and described statistics parameter also comprises the mean value and the standard deviation of a plurality of residual current relative values in each segmentation period; Described threshold value generation unit also comprises:

Determining unit, connect described first generation unit, described second generation unit and described the 3rd generation unit, be used for statistics parameter characteristic according to the described segmentation period, be identified for generating the residual current relative value and the standard deviation of the alarm threshold value of time point of monitoring, generate from described first generation unit, second generation unit and the described the 3rd and select one the unit and generate described alarm threshold value.

4. a residual current monitoring warning system is characterized in that, described system comprises: Centralized Controller, buses isolator, detection controller, current probe and residual current detector; Described Centralized Controller connects by buses isolator surveys controller; Described detection controller connects described current probe and residual current detector;

Described current probe is used to gather the three-phase load electric current;

Described residual current detector is used to gather residual current;

Described detection controller is used to receive the load current value and the residual electricity flow valuve of collection, according to the load current value and the residual electricity flow valuve of gathering, generates and stores the residual current relative value of each acquisition time point; A plurality of residual current relative values in the default duration are carried out statistical study, generate and store the statistics parameter of described a plurality of residual current relative values; According to the described residual current relative value and the described statistics parameter of storage before the time point of monitoring, generate the alarm threshold value of time point of monitoring; According to the alarm threshold value that generates the residual current of described monitoring loop is carried out monitoring alarm.

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