CN104034444A - Main transformer temperature state detection method - Google Patents

Abstract

A main transformer temperature state detection method comprises the following steps of: a) obtaining current temperature of a main transformer, and setting a good value and a maximum allowable value of the temperature, wherein the temperature is directly obtained through a monitoring background or a transformer thermometer; b) establishing piecewise functions of the temperature corresponding to different state levels, wherein the state levels include a good level, a normal level, a warning level, and a serious level; and c) substituting the temperature into the piecewise functions to obtain membership degree values of the temperature belonging to the state levels, and displaying a state level corresponding to a maximum membership degree value as a current state of the main transformer. With the main transformer temperature state detection method of the invention adopted, problems such as complex state monitoring, proneness to error generation, and lower efficiency can be solved.

Description

A kind of main transformer state of temperature detection method

Technical field

What the present invention relates to is a kind of main transformer state of temperature detection method of transformer station, belongs to transformer state detection technique field.

Background technology

At present, the maintenance model of main transformer is according to the requirement of fortune rule, main transformer is carried out to prophylactic repair, maintenance mode has significant limitation, on the one hand, if main transformer certain module breaks down between twice maintenance, and do not affect in the situation of main transformer normal power supply, can only wait until that verification next time could find, have a strong impact on the reliability and stability of system; On the other hand, prophylactic repair has consumed manpower and materials a large amount of, has increased the overall life cycle cost of system, the simultaneously power failure of maintenance process, has reduced the utilization rate of equipment, has increased meaningless power off time, for realizing main transformer repair based on condition of component, need to increase the information of main transformer on-line monitoring.At present some device of main transformer has possessed self-checking function, but monitoring information is comprehensive not, and monitoring range relatively limits to, and cannot meet the requirement of repair based on condition of component.

The in the situation that of unattended and minimizing regulation and control center operation monitoring personnel, existing status monitoring information type and quantity are very many, these mixed and disorderly monitoring informations cannot be processed in regulation and control center, therefore, must in station, realize the state estimation of main transformer, and will in directly perceived, visual assessment result, deliver to regulation and control center.

Summary of the invention

The object of the invention is to overcome the deficiency that prior art exists, and provide a kind of, can solve preferably the main transformer state of temperature detection method that the status monitoring amount existing in existing method is complicated, easily produce the problems such as error, efficiency are low.

For achieving the above object, the present invention takes following technical scheme: described main transformer state of temperature detection method, it comprises the steps:

A) obtain main transformer Current Temperatures, and set the good value of this temperature and allow maximal value;

B) combination based on triangle, trapezoidal shape, sets up temperature corresponding to the piecewise function of different conditions grade;

C), by each piecewise function of temperature substitution, try to achieve the lishu degree value that temperature belongs to each state grade, and the current state using state grade corresponding to maximum membership degree value as this main transformer shows.

Step of the present invention is obtaining by directly obtaining on monitoring backstage or transformer thermometer of middle temperature a);

Described step b) state grade described in comprises: good, general, note and serious state;

The piecewise function of the corresponding different conditions grade of temperature described step c) is as follows:

Kilter function: $\mathrm{Uvl}\left(x\right)=\left\{\begin{array}{ccc}1& x\&le;a1& \\ Y=\frac{-1}{20}x+3& a1<x<a2& \\ 0& x\&GreaterEqual;a2& \end{array}\right.$

General state function: $\mathrm{Uv}2\left(x\right)=\left\{\begin{array}{cc}Y=\frac{1}{20}x-2& a1<x<a2\\ Y=\frac{-1}{20}x+4& a2<x<a3\end{array}\right.$

0 x≤a1 or x >=a3

Attention state function:

Serious function of state: $\mathrm{Uv}4\left(x\right)=\left\{\begin{array}{ccc}0& x\&le;a3& \\ Y=\frac{1}{25}x-\frac{16}{5}& a3<x<a4& \\ Y=1& x\&GreaterEqual;a4& \end{array}\right.$

Wherein x represents temperature, and a1, a2, a3, a4 are definite value;

Described a1=40 ℃, a2=60 ℃, a3=80 ℃, a4=105 ℃;

Described step c) should provide according to shown state corresponding treatment measures afterwards;

Main transformer state of temperature detection method of the present invention, according to the main transformer temperature value obtaining, trying to achieve reaction virtual condition compares with malfunction, and build main transformer temperature corresponding to the distribution function of different brackets state, try to achieve main transformer temperature value and belong to the lishu degree value of each state grade, and the current state using state grade corresponding to maximum membership degree value as this main transformer shows; By the method, can directly show the residing state of main transformer, Status Type can be set to well, general, note and serious state, operations staff can directly take appropriate measures according to main transformer state, to detect before fault, and can avoid in time the generation of fault, this method calculates temperature with respect to the functional value (degree of membership) of various states according to different function of states, can obtain the current state of main transformer, this method is compared realization more simply and be there is no error with the method for describing in background technology.

Accompanying drawing explanation

Fig. 1 is detection system schematic diagram of the present invention;

Fig. 2 is four kinds of function of states corresponding to main transformer temperature of the present invention;

Embodiment

Below in conjunction with drawings and Examples, the present invention will be described in detail: shown in Fig. 1, the detection system that the present invention adopts comprises temperature sensor, to obtain main transformer temperature, and obtains main transformer state of temperature testing result of the present invention by supervisory system; Due to the monitoring of main transformer is comprised to the monitoring to temperature, but only see that main transformer temperature instantaneous value can not fast, accurately judge the health status of current main transformer, therefore need a kind of main transformer state of temperature detection method correctly to reflect the ruuning situation of main transformer.

Main transformer state of temperature detection method of the present invention, it comprises the steps:

A) obtain main transformer current temperature value, and the good value of design temperature and permission maximal value, temperature is by directly obtaining on monitoring backstage or transformer thermometer;

The good value of main transformer temperature and permission maximal value are comprehensively to draw according to main transformer parameter known quantity and practical operating experiences, current temperature value is the data that collected by temperature sensor Real-Time Monitoring, before main transformer fault, temperature is a process gradually changing, when temperature moves closer to maximum permissible value, operation monitoring personnel have obtained warning information in advance, realize in advance and detecting.

B) combination based on triangle, trapezoidal shape, set up temperature corresponding to good, general, note, the serious piecewise function of these four kinds of state grades, as shown in Figure 2:

1 x≤a1

Kilter function: $\mathrm{Uvl}\left(x\right)=\left\{\begin{array}{ccc}& & \\ Y=\frac{-1}{20}x+3& a1<x<a2& \\ 0& x\&GreaterEqual;a2& \end{array}\right.$

General state function: $\mathrm{Uv}2\left(x\right)=\left\{\begin{array}{cc}Y=\frac{1}{20}x-2& a1<x<a2\\ Y=\frac{-1}{20}x+4& a2<x<a3\end{array}\right.$

0 x≤a1 or x >=a3

Attention state function:

Serious function of state: $\mathrm{Uv}4\left(x\right)=\left\{\begin{array}{ccc}0& x\&le;a3& \\ Y=\frac{1}{25}x-\frac{16}{5}& a3<x<a4& \\ Y=1& x\&GreaterEqual;a4& \end{array}\right.$

Wherein x represents temperature, and a1, a2, a3, a4 are definite value;

By each piecewise function of temperature substitution, try to achieve the degree of membership value that temperature belongs to each state grade, and the current state using state grade corresponding to maximum membership degree value as this main transformer shows;

According to shown state, provide corresponding treatment measures;

Provide an example in detail main transformer state of temperature detection method below;

If a1=40 ℃, a2=60 ℃, a3=80 ℃, a4=105 ℃ bring said temperature value into the relation function of following main transformer temperature:

Kilter function: $\mathrm{Uvl}\left(x\right)=\left\{\begin{array}{ccc}1& x\&le;a1& \\ Y=\frac{-1}{20}x+3& a1<x<a2& \\ 0& x\&GreaterEqual;a2& \end{array}\right.$

General state function: $\mathrm{Uv}2\left(x\right)=\left\{\begin{array}{cc}Y=\frac{1}{20}x-2& a1<x<a2\\ Y=\frac{-1}{20}x+4& a2<x<a3\end{array}\right.$

0 x≤a1 or x >=a3

Attention state function:

(34) serious function of state: $\mathrm{Uv}4\left(x\right)=\left\{\begin{array}{ccc}0& x\&le;a3& \\ Y=\frac{1}{25}x-\frac{16}{5}& a3<x<a4& \\ Y=1& x\&GreaterEqual;a4& \end{array}\right.$

Can obtain respectively the membership values of four kinds of states corresponding to each temperature, obtain maximal value and be the current state of main transformer.

By the x=40 ℃ of above-mentioned four groups of functions of substitution, obtain respectively U1=1, U2=0, U3=0, U4=0, maximal value U1=1, therefore, this main transformer goes out at kilter, if main transformer noting or serious state, operations staff adds to pay close attention to or the maintenance of reporting to the police is processed.

The present invention relates to main transformer state of temperature detection method, according to the temperature of obtaining, try to achieve main transformer virtual condition and malfunction difference, and build main transformer temperature corresponding to the distribution function of different brackets state, try to achieve main transformer temperature value and belong to the lishu degree value of each state grade, and the current state using state grade corresponding to maximum membership degree value as this main transformer shows; By the method, can directly show the residing state of main transformer, Status Type can be set to well, general, note and serious state, operations staff can directly take appropriate measures according to main transformer state, is to detect before fault, and can avoid in time the generation of fault.

Claims (5)

1. a main transformer state of temperature detection method, is characterized in that it comprises the steps:

A) obtain main transformer Current Temperatures, and set the good value of this temperature and allow maximal value;

B) combination based on triangle, trapezoidal shape, sets up temperature corresponding to the piecewise function of different conditions grade;

C), by each piecewise function of temperature substitution, try to achieve the lishu degree value that temperature belongs to each state grade, and the current state using state grade corresponding to maximum membership degree value as this main transformer shows.

2. main transformer state of temperature detection method according to claim 1, is characterized in that described step a), the obtaining by directly obtaining on monitoring backstage or transformer thermometer of temperature.

3. main transformer state of temperature detection method according to claim 1, is characterized in that described step b) in, described state grade comprises: good, general, note and serious state.

4. main transformer state of temperature detection method according to claim 1, is characterized in that described step c) in, the piecewise function of the corresponding different conditions grade of described temperature is as follows:

Kilter function: $\mathrm{Uvl}\left(x\right)=\left\{\begin{array}{ccc}1& x\&le;a1& \\ Y=\frac{-1}{20}x+3& a1<x<a2& \\ 0& x\&GreaterEqual;a2& \end{array}\right.$

General state function: $\mathrm{Uv}2\left(x\right)=\left\{\begin{array}{cc}Y=\frac{1}{20}x-2& a1<x<a2\\ Y=\frac{-1}{20}x+4& a2<x<a3\end{array}\right.$

0 x≤a1 or x >=a3

Attention state function:

Serious function of state: $\mathrm{Uv}4\left(x\right)=\left\{\begin{array}{ccc}0& x\&le;a3& \\ Y=\frac{1}{25}x-\frac{16}{5}& a3<x<a4& \\ Y=1& x\&GreaterEqual;a4& \end{array}\right.$

Wherein x represents temperature, and a1, a2, a3, a4 are definite value;

Described a1=40 ℃, a2=60 ℃, a3=80 ℃, a4=105 ℃.

5. according to the main transformer state of temperature detection method described in claim 1 or 4, it is characterized in that described step c) should provide according to shown state corresponding treatment measures afterwards.