CN103592415B - Single-component gas concentration correction process in transformer oil - Google Patents

Abstract

Single-component gas concentration correction process in a kind of transformer oil, relates to power transformer technical field, and what solve is the technical matters reducing testing cost.The method is regularly extracted transformer oil sample and is carried out offline inspection, obtains high-precision gas concentration offline inspection result; Again according to the high-precision gas concentration offline inspection result of single-component gas in transformer oil, calculate gas concentration offline inspection result Trend value, again in calculating transformer oil single-component gas at the gas concentration on-line checkingi result Trend value of the current moon, and then single-component gas is at the gas concentration correction scale-up factor of the current moon and gas concentration correction constant in calculating transformer oil, then the gas concentration on-line checkingi result to single-component gas in transformer oil is revised according to gas concentration correction scale-up factor and gas concentration correction constant.Method provided by the invention, the transformer oil sample being applicable to transformer station detects.

Description

Single-component gas concentration correction process in transformer oil

Technical field

The present invention relates to power transformer technology, particularly relate to the technology of single-component gas concentration correction process in a kind of transformer oil.

Background technology

In electric system, insulating material in the oil-filled pipeline of transformer of normal operation can be aging gradually under the effect such as hot, electric, produce multiple inflammable gas, constantly accumulation, convection current, diffusion, dissolving in the fluid of these gases in the oil-filled pipeline of transformer, until saturated and bubble, the gas evolution in fluid, the component gas content of analytical gas, insulation status and the internal electric equipment discharge scenario of transformer can be identified, effectively can reduce the generation of Accident of Transformer.

At present, degassed mode is adopted mostly to multicomponent gas identification in transformer oil, which needs to take a long time multicomponent gas in separate transformers oil, and degasification process is complicated, accurate measurement multicomponent gas needs accurate device, higher to the accuracy requirement of detecting sensor, therefore in existing transformer oil, detection of gas with multiple constituents installation cost remains high.

Summary of the invention

For the defect existed in above-mentioned prior art, technical matters to be solved by this invention is to provide single-component gas concentration correction process in the low transformer oil of a kind of testing cost.

In order to solve the problems of the technologies described above, single-component gas concentration correction process in a kind of transformer oil provided by the present invention, it is characterized in that, concrete steps are as follows:

1) the single month gas concentration on-line checkingi number of times of setting to single-component gas in transformer oil, is designated as M;

2) regularly extract transformer oil sample and carry out offline inspection, utilize existing precision detecting instrument to record the high-precision gas concentration offline inspection result of single-component gas in transformer oil;

In each calendar month, the online gas concentration of single-component gas in transformer oil being carried out to M time detects, and records each testing result;

3) will the calendar month revising gas concentration on-line checkingi result be needed to be set as the current moon;

4) from transformer oil single-component gas high-precision gas concentration offline inspection result in, to obtain before the current moon and apart from nearest 3 gas concentration offline inspection results of the current moon, by these 3 gas concentration offline inspection results by the sequencing of detection time, by first to after be designated as T [1], T [2], T [3] successively;

5) the gas concentration offline inspection result Trend value of single-component gas in calculating transformer oil, specific formula for calculation is:

Ttr＝(T[3]+T[1]-2×T[2])/2+T[3]；

In formula, Ttr is the gas concentration offline inspection result Trend value of single-component gas in transformer oil;

6) in calculating transformer oil, single-component gas is at the gas concentration on-line checkingi result Trend value of the current moon, and specific formula for calculation is:

Ptr[n]＝(Gm[n-3]+Gm[n-1]–2×Gm[n-2])/2+Gm[n-1]；

$\mathrm{Gm}\left[i\right]=\underset{j=1}{\overset{M}{\mathrm{\Σ}}}(j\×G[i,j\left]\right)/\underset{j=1}{\overset{M}{\mathrm{\Σ}}}j$

In formula, Ptr [n] is for single-component gas in transformer oil is at the gas concentration on-line checkingi result Trend value of the current moon, n is the current moon, n-1 is the previous calendar month of the n month, n-2 is the previous calendar month of the n-1 month, n-3 is the previous calendar month of the n-2 month, Gm [n-1] is for single-component gas in transformer oil was the gas concentration on-line checkingi result monthly average value of the (n-1)th month, Gm [n-2] is for single-component gas in transformer oil was the gas concentration on-line checkingi result monthly average value of n-th-2 months, Gm [n-3] is for single-component gas in transformer oil was the gas concentration on-line checkingi result monthly average value of n-th-3 months,

In formula, Gm [i] is for single-component gas in transformer oil was the gas concentration on-line checkingi result monthly average value of the i-th month, and G [i, j] is for single-component gas in transformer oil was the jth time gas concentration on-line checkingi result of the i-th month;

7) in calculating transformer oil, single-component gas is at the gas concentration correction scale-up factor of the current moon and gas concentration correction constant, and specific formula for calculation is:

K＝int(Ttr/Ptr[n])；

B＝Ttr–K×Ptr[n]；

In formula, K is that in transformer oil, single-component gas is at the gas concentration correction scale-up factor of the current moon, and B is that in transformer oil, single-component gas is at the gas concentration correction constant of the current moon, and int is bracket function;

8) revise the gas concentration on-line checkingi result of single-component gas in transformer oil in the current moon, concrete correction formula is:

S[n,j]＝G[n,j]×K+B；

In formula, S [n, j] is for single-component gas in transformer oil is in the modified value of the jth time gas concentration on-line checkingi result of the current moon, and G [n, j] is for single-component gas in transformer oil is in the jth time gas concentration on-line checkingi result of the current moon.

Single-component gas concentration correction process in transformer oil provided by the invention, according to the high-precision gas concentration offline inspection result of transformer oil sample, the gas concentration on-line checkingi result of single-component gas in transformer oil is revised, it is low that the method realizes cost, less demanding to sensor accuracy, testing cost can be reduced when ensureing gas concentration on-line checkingi precision.

Accompanying drawing explanation

Fig. 1 is the process flow diagram of single-component gas concentration correction process in embodiment of the present invention transformer oil.

Embodiment

Illustrate below in conjunction with accompanying drawing and be described in further detail embodiments of the invention, but the present embodiment is not limited to the present invention, every employing analog structure of the present invention and similar change thereof, all should list protection scope of the present invention in.

As shown in Figure 1, single-component gas concentration correction process in a kind of transformer oil that the embodiment of the present invention provides, it is characterized in that, concrete steps are as follows:

1) the single month gas concentration on-line checkingi number of times of setting to single-component gas in transformer oil, is designated as M;

2) regularly (being generally six months) is extracted transformer oil sample and is carried out offline inspection, utilizes existing precision detecting instrument to record the high-precision gas concentration offline inspection result of single-component gas in transformer oil;

In each calendar month, the online gas concentration of single-component gas in transformer oil being carried out to M time detects, and records each testing result;

3) will the calendar month revising gas concentration on-line checkingi result be needed to be set as the current moon;

4) from transformer oil single-component gas high-precision gas concentration offline inspection result in, to obtain before the current moon and apart from nearest 3 gas concentration offline inspection results of the current moon, by these 3 gas concentration offline inspection results by the sequencing of detection time, by first to after be designated as T [1], T [2], T [3] successively;

5) the gas concentration offline inspection result Trend value of single-component gas in calculating transformer oil, specific formula for calculation is:

Ttr＝(T[3]+T[1]-2×T[2])/2+T[3]；

In formula, Ttr is the gas concentration offline inspection result Trend value of single-component gas in transformer oil;

6) in calculating transformer oil, single-component gas is at the gas concentration on-line checkingi result Trend value of the current moon, and specific formula for calculation is:

Ptr[n]＝(Gm[n-3]+Gm[n-1]–2×Gm[n-2])/2+Gm[n-1]；

$\mathrm{Gm}\left[i\right]=\underset{j=1}{\overset{M}{\mathrm{\Σ}}}(j\×G[i,j\left]\right)/\underset{j=1}{\overset{M}{\mathrm{\Σ}}}j$

In formula, Ptr [n] is for single-component gas in transformer oil is at the gas concentration on-line checkingi result Trend value of the current moon, n is the current moon, n-1 is the previous calendar month of the n month, n-2 is the previous calendar month of the n-1 month, n-3 is the previous calendar month of the n-2 month, Gm [n-1] is for single-component gas in transformer oil was the gas concentration on-line checkingi result monthly average value of the (n-1)th month, Gm [n-2] is for single-component gas in transformer oil was the gas concentration on-line checkingi result monthly average value of n-th-2 months, Gm [n-3] is for single-component gas in transformer oil was the gas concentration on-line checkingi result monthly average value of n-th-3 months,

In formula, Gm [i] is for single-component gas in transformer oil was the gas concentration on-line checkingi result monthly average value of the i-th month, and G [i, j] is for single-component gas in transformer oil was the jth time gas concentration on-line checkingi result of the i-th month;

7) in calculating transformer oil, single-component gas is at the gas concentration correction scale-up factor of the current moon and gas concentration correction constant, and specific formula for calculation is:

K＝int(Ttr/Ptr[n])；

B＝Ttr–K×Ptr[n]；

In formula, K is that in transformer oil, single-component gas is at the gas concentration correction scale-up factor of the current moon, and B is that in transformer oil, single-component gas is at the gas concentration correction constant of the current moon, and int is bracket function;

8) revise the gas concentration on-line checkingi result of single-component gas in transformer oil in the current moon, concrete correction formula is:

S[n,j]＝G[n,j]×K+B；

In formula, S [n, j] is for single-component gas in transformer oil is in the modified value of the jth time gas concentration on-line checkingi result of the current moon, and G [n, j] is for single-component gas in transformer oil is in the jth time gas concentration on-line checkingi result of the current moon.

Claims (1)

1. a single-component gas concentration correction process in transformer oil, it is characterized in that, concrete steps are as follows:

1) the single month gas concentration on-line checkingi number of times of setting to single-component gas in transformer oil, is designated as M;

2) regularly extract transformer oil sample and carry out offline inspection, utilize existing precision detecting instrument to record the high-precision gas concentration offline inspection result of single-component gas in transformer oil;

In each calendar month, the online gas concentration of single-component gas in transformer oil being carried out to M time detects, and records each testing result;

3) will the calendar month revising gas concentration on-line checkingi result be needed to be set as the current moon;

4) from transformer oil single-component gas high-precision gas concentration offline inspection result in, to obtain before the current moon and apart from nearest 3 gas concentration offline inspection results of the current moon, by these 3 gas concentration offline inspection results by the sequencing of detection time, by first to after be designated as T [1], T [2], T [3] successively;

5) the gas concentration offline inspection result Trend value of single-component gas in calculating transformer oil, specific formula for calculation is:

Ttr = （T[3]+T[1]-2×T[2]）/2 + T[3]；

In formula, Ttr is the gas concentration offline inspection result Trend value of single-component gas in transformer oil;

6) in calculating transformer oil, single-component gas is at the gas concentration on-line checkingi result Trend value of the current moon, and specific formula for calculation is:

Ptr[n] = （Gm[n-3] + Gm[n-1] – 2 × Gm[n-2]）/2 + Gm[n-1]；

In formula, Ptr [n] is for single-component gas in transformer oil is at the gas concentration on-line checkingi result Trend value of the current moon, n is the current moon, n-1 is the previous calendar month of the n month, n-2 is the previous calendar month of the n-1 month, n-3 is the previous calendar month of the n-2 month, Gm [n-1] is for single-component gas in transformer oil was the gas concentration on-line checkingi result monthly average value of the (n-1)th month, Gm [n-2] is for single-component gas in transformer oil was the gas concentration on-line checkingi result monthly average value of n-th-2 months, Gm [n-3] is for single-component gas in transformer oil was the gas concentration on-line checkingi result monthly average value of n-th-3 months,

In formula, Gm [i] is for single-component gas in transformer oil was the gas concentration on-line checkingi result monthly average value of the i-th month, and G [i, j] is for single-component gas in transformer oil was the jth time gas concentration on-line checkingi result of the i-th month;

7) in calculating transformer oil, single-component gas is at the gas concentration correction scale-up factor of the current moon and gas concentration correction constant, and specific formula for calculation is:

K = int（Ttr / Ptr[n]）；

B = Ttr – K×Ptr[n]；

In formula, K is that in transformer oil, single-component gas is at the gas concentration correction scale-up factor of the current moon, and B is that in transformer oil, single-component gas is at the gas concentration correction constant of the current moon, and int is bracket function;

8) revise the gas concentration on-line checkingi result of single-component gas in transformer oil in the current moon, concrete correction formula is:

S[n,j] =G[n,j]×K + B；

In formula, S [n, j] is for single-component gas in transformer oil is in the modified value of the jth time gas concentration on-line checkingi result of the current moon, and G [n, j] is for single-component gas in transformer oil is in the jth time gas concentration on-line checkingi result of the current moon.