CN104280619A - Method for anti-interference processing of dielectric loss monitoring value of transformer bushing - Google Patents

Abstract

The invention discloses a method for anti-interference processing of the dielectric loss monitoring value of a transformer bushing. The method for anti-interference processing of the dielectric loss monitoring value of the transformer bushing comprises the steps that five-point median filtering is conducted on N groups of dielectric loss data tan delta [i] (i=1-N) which are collected in one second by a transformer bushing monitoring device, so that a new group of dielectric loss data tan delta' [i] (i=1-N-4) are obtained, and the arithmetic mean value (please see the specification for the symbol) and the standard deviation s of the group of dielectric loss data tan delta' [i] (i=1-N-4) are obtained; if s is smaller than or equal to a permissible value, the arithmetic mean value is taken as the dielectric loss monitoring value of the bushing in the prior one second; if s is larger than the permissible value, the weighted average of the bushing dielectric losses monitored in the prior six seconds is taken as the dielectric loss monitoring value of the bushing in the prior one second. According to the method for anti-interference processing of the dielectric loss monitoring value of the transformer bushing, the problem of dielectric loss monitoring value discretion caused by factors such as signal fluctuation and external interference can be solved, and the effectiveness of monitoring data of the transformer bushing is improved.

Description

A kind of anti-interference processing method of bushing shell for transformer dielectric loss monitor value

Technical field

The present invention relates to a kind for the treatment of technology of electrical equipment online supervision data, particularly relate to the anti-interference process technology for bushing shell for transformer insulation monitoring data.Specifically a kind of anti-interference processing method of bushing shell for transformer dielectric loss monitor value.

Background technology

Implement on-line monitoring to bushing shell for transformer, can find the potential of transformer or breakout defects timely and effectively, therefore the validity of online monitoring data is most important.

In bushing shell for transformer dielectric loss on-line monitoring process, it is generally acknowledged that voltage, the current signal recorded in short time under normal circumstances can regard stable periodic signal as, there will not be larger fluctuation, even if there is defect, the change of its Monitoring Data is also very slowly, but in fact the measurement of sleeve pipe dielectric loss can be subject to the impact of such as frequency jitter, humorous wave interference, phase drift, mutual inductor angle error, working voltage, load state, ambient temperature and humidity and other accidental factors, causes Monitoring Data to have discreteness; And during apparatus insulated deterioration, dielectric loss monitor value will be very responsive to above each influence factor.

The present invention proposes a kind of anti-interference processing method of bushing shell for transformer dielectric loss monitor value, anti-interference process is carried out to bushing shell for transformer Monitoring Data, can effectively suppress in measuring process because signal fluctuation, running environment affect the interference caused, solve the dispersed problem of dielectric loss monitor value, guarantee the validity of bushing shell for transformer Monitoring Data.

Summary of the invention

The invention provides a kind of anti-interference processing method of bushing shell for transformer dielectric loss monitor value, the dielectric loss monitor value dispersed problem because the factor such as signal fluctuation, external disturbance causes can be solved, improve the validity of bushing shell for transformer Monitoring Data.

The technical scheme that the present invention solves the problems of the technologies described above is as follows:

A kind of anti-interference processing method of bushing shell for transformer dielectric loss monitor value comprises the following steps:

Step 1: obtain the N number of dielectric loss monitor value tan δ in 1 second from bushing shell for transformer monitoring device _i(i=1 ~ N).

Step 2: to tan δ _i(i=1 ~ N) carries out 5 medium filtering process, obtains one group of new dielectric loss data tan δ ' _i(i=1 ~ N-4).

Step 3: ask for array tan δ ' _ithe arithmetic mean of (i=1 ~ N-4)

Step 4: ask for array tan δ ' _ithe standard deviation s of (i=1 ~ N-4).

Step 5: the size judging s, if s≤permissible value, then using as the sleeve pipe dielectric loss monitor value in current 1 second; If s > permissible value, then use the weighted mean of the sleeve pipe dielectric loss monitor value obtained for 6 seconds as the sleeve pipe dielectric loss monitor value in current 1 second above.

Feature of the present invention:

The present invention has and to suppress in bushing shell for transformer dielectric loss monitor value measuring process, because signal fluctuation, running environment affect the ability of the interference caused, by the filtering of N group monitor value, to ask for arithmetic mean and standard deviation; And for interval to solve monitor value residing for standard deviation, solve the dispersed problem of dielectric loss monitor value, guarantee the validity of bushing shell for transformer Monitoring Data.

Accompanying drawing explanation

Fig. 1 is the process flow diagram of the anti-interference processing method of bushing shell for transformer dielectric loss monitor value of the present invention.

Embodiment

Because the measurement of bushing shell for transformer dielectric loss can be subject to such as frequency jitter, humorous wave interference, phase drift, the impact of ambient temperature and humidity and other accidental factors, Monitoring Data is caused to have discreteness, thus cause the distortion of Monitoring Data and invalid, and the cover tube voltage recorded in the short time under normal circumstances, current signal can regard stable periodic signal as, even if there is defect, the change of its Monitoring Data is also very slowly, therefore the invention provides a kind of anti-interference processing method of bushing shell for transformer dielectric loss monitor value, the discrete data because extraneous factor produces can be rejected, improve the validity of online monitoring data.

Below in conjunction with concrete enforcement, the invention will be further described.

The anti-interference processing method of bushing shell for transformer dielectric loss monitor value, concrete steps are as follows:

Step 1: obtain the N number of dielectric loss monitor value tan δ in 1 second from bushing shell for transformer monitoring device _i(i=1 ~ N);

Step 2: to tan δ _i(i=1 ~ N) carries out 5 medium filtering process, obtains one group of new dielectric loss data tan δ ' _i(i=1 ~ N-4);

Step 3: ask for array tan δ ' _ithe arithmetic mean of (i=1 ~ N-4)

Step 4: ask for array tan δ ' _ithe standard deviation s of (i=1 ~ N-4);

Step 5: the size judging s, if s≤permissible value, then using as the sleeve pipe dielectric loss monitor value in current 1 second; If s > permissible value, then use the weighted mean of the sleeve pipe dielectric loss monitor value obtained for 6 seconds as the sleeve pipe dielectric loss monitor value in current 1 second above.

Before supposing current second, the sleeve pipe dielectric loss value of j second is Num (j) (j=1 ~ 6), then when s > permissible value, the dielectric loss value of current second is tan δ:

If only had 1 Monitoring Data before current second, then tan δ=Num (1);

If there were 2 Monitoring Data before current second, then tan δ=0.7Num (1)+0.3Num (2);

If there were 3 Monitoring Data before current second, then tan δ=0.65Num (1)+0.25Num (2)+0.1Num (3);

If there were 4 Monitoring Data before current second, then tan δ=0.6Num (1)+0.2Num (2)+0.1 (Num (3)+Num (4));

If there were 5 Monitoring Data before current second, then tan δ=0.5Num (1)+0.15 (Num (2)+Num (3))+0.1 (Num (4)+Num (5));

If there were more than 6 Monitoring Data before current second, then tan δ=0.5Num (1)+0.15 (Num (2)+Num (3))+0.08 (Num (4)+Num (5))+0.04Num (6);

The present invention can solve the dielectric loss monitor value dispersed problem because external factor causes, and greatly enhances the validity of bushing shell for transformer Monitoring Data.

Claims (1)

1. an anti-interference processing method for bushing shell for transformer dielectric loss monitor value, is characterized in that, comprises the following steps:

Step 1: obtain the N number of dielectric loss monitor value tan δ in 1 second from bushing shell for transformer monitoring device _i(i=1 ~ N);

Step 2: to tan δ _i(i=1 ~ N) carries out 5 medium filtering process, obtains one group of new dielectric loss data tan δ ' _i(i=1 ~ N-4);

Step 3: ask for array tan δ ' _ithe arithmetic mean of (i=1 ~ N-4)

Step 4: ask for array tan δ ' _ithe standard deviation s of (i=1 ~ N-4);

Step 5: the size judging s, if s≤permissible value, then using as the sleeve pipe dielectric loss monitor value in current 1 second; If s > permissible value, then use the weighted mean of the sleeve pipe dielectric loss monitor value obtained for 6 seconds as the sleeve pipe dielectric loss monitor value in current 1 second above.