CN112197867A - Carbon brush detection and early warning state setting method - Google Patents
Carbon brush detection and early warning state setting method Download PDFInfo
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- CN112197867A CN112197867A CN202011026152.0A CN202011026152A CN112197867A CN 112197867 A CN112197867 A CN 112197867A CN 202011026152 A CN202011026152 A CN 202011026152A CN 112197867 A CN112197867 A CN 112197867A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000001514 detection method Methods 0.000 title claims description 8
- 238000005259 measurement Methods 0.000 claims description 14
- 238000009529 body temperature measurement Methods 0.000 description 7
- 238000007689 inspection Methods 0.000 description 6
- 238000005070 sampling Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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Abstract
The invention discloses a method for detecting and setting an early warning state of a carbon brush, which comprises the following steps: setting an acquisition period; measuring the temperature of the carbon brush in an acquisition period; acquiring a maximum temperature value in an acquisition period and judging whether the maximum temperature value is continuously greater than a threshold value; acquiring the difference between the maximum value and the minimum value in the acquisition period and judging whether the difference is greater than a threshold value; acquiring a temperature rise value in an acquisition period and judging whether the temperature rise value is greater than a threshold value or not; and the system performs early warning according to the early warning state value. According to the invention, the on-line safety analysis and early warning are carried out on the carbon brush, so that the timeliness of the operation decision of the power plant and the early warning and pre-controlling capability are improved.
Description
Technical Field
The invention relates to the technical field of excitation carbon brush safety detection of a generator, in particular to a method for carbon brush detection and early warning state setting.
Background
The carbon brush of the generator is also called as a motor carbon brush or a motor brush, is used on a commutator or a slip ring of the motor as a sliding contact body for leading out and leading in current, and is an important component part on the generator. In the working process of the generator, the carbon brush always rubs with the slip ring, and electric spark erosion can be generated in the moment of reversing, so that the carbon brush of the motor is a wearing part, the state (particularly the temperature) of the carbon brush needs to be monitored, in the prior art, a manual regular inspection mode is adopted for monitoring the carbon brush of the motor, on one hand, the operation is long, safety risks exist in the inspection process of an inspection worker, on the other hand, due to the adoption of the manual inspection mode, the current of the carbon brush in the working process is large in change and fast in change, so that the collected parameters do not have actual reference significance, and the detection result is extremely inaccurate.
The temperature measurement of the carbon brush of the generator generally adopts timing inspection by manually using temperature measurement equipment or point-to-point infrared temperature measurement. The temperature of the whole carbon brush system can be comprehensively detected through manual inspection, but a plurality of objective factors such as negligence of personnel exist, and the real-time temperature of the carbon brush cannot be monitored in 24 hours. The infrared temperature measurement is a point-to-point temperature measurement, and although the temperature measurement is carried out for 24 hours, the point-to-point temperature measurement cannot carry out all-around monitoring on the temperature of the whole generator carbon brush system.
Disclosure of Invention
The invention aims to solve the problems and provides a method for carrying out safety detection and early warning on a carbon brush through a thermal infrared imager, so that the carbon brush is subjected to online safety analysis and early warning, and the timeliness and early warning and pre-control capability of a power plant operation decision are improved.
A method for setting carbon brush detection and early warning states comprises the following steps:
s1, collecting the working temperature of the carbon brush by using a thermal infrared imager;
s2, setting a temperature threshold value W1, a temperature difference threshold value V2 and a temperature rise threshold value A3, setting a temperature rise recording unit time value U3 and setting a temperature rise time threshold value N3; setting a delay time value T;
s3, controlling the thermal infrared imager to measure the temperature, and setting the measurement period as Tmeas, the rotating speed of the carbon brush as Vangle and the field angle of the thermal infrared imager as theta1The distance from the thermal infrared imager to the nearest carbon brush is d,the radius of the circle formed by the carbon brush device is R, the frame rate of the thermal infrared imager is Nframe, and then:
s4, when the highest temperature of the carbon brush collected by the thermal infrared imager is higher than a temperature threshold value W1, starting a Timer1, and setting the value of the Timer1 as T; during the running of the Timer1, if the highest temperature is lower than the temperature threshold value W1, the Timer1 is stopped; if the highest temperature is continuously higher than the temperature threshold value W1, when the Timer1 expires, the current early warning state value Status is set as a first early warning state value Level1, and the difference value V between the highest temperature and the lowest temperature of the carbon brush collected by the thermal infrared imager is recordedm；
S5, when the early warning state value Status is a first early warning value Level1, if the highest temperature value is lower than a temperature threshold value W1, a Timer1 is started, and the value of the Timer1 is set to be T; in the running process of the Timer1, if the highest temperature value is higher than a temperature threshold value W1, the Timer1 is stopped, and if the highest temperature value is continuously lower than a temperature threshold value W1, the current early warning state value is set to be a normal state value normal when the Timer1 is up;
when the early warning state value Status is a first early warning value Level1, if a difference value Vm of the highest temperature and the lowest temperature is higher than a temperature difference threshold value V2, a Timer2 is started, the value of the Timer2 is set to be T, and during the running period of the Timer2, if the temperature difference value Vm is lower than a temperature difference threshold value V2, the Timer2 is stopped; during the running period of the Timer2, if the temperature difference value is continuously higher than a temperature difference threshold value V2 and the highest temperature value is larger than a temperature threshold value W1, setting the current early warning state value Status as a second early warning value Level2 when the Timer2 is up;
when the early warning state value Status is a second early warning value Level2, if the highest temperature value is lower than a temperature threshold value W1, a Timer1 is started, the value of the Timer1 is set to T, if the highest temperature value is higher than a temperature threshold value W1 during the running of the Timer1, the Timer1 is stopped, and if the highest temperature value is lower than the temperature threshold value W1 within a continuously set time length, the current early warning state value is set to be a normal state value normal when the Timer1 is up;
when the early warning state value Status is a second early warning value Level2, if the temperature difference value is lower than a temperature difference threshold value V2, a Timer2 is started, the value of the Timer2 is set to T, if the temperature difference value is higher than a temperature difference threshold value V2 in the running process of the Timer2, the Timer2 is stopped, if the temperature difference value is lower than the temperature difference threshold value V2 within the continuously set time length, when the Timer2 is up, whether the current highest temperature value is larger than or equal to a temperature threshold value W1 or not is judged, if yes, the current early warning state value is set as a first-Level 1, otherwise, the current early warning state value is set as a normal state value normal;
when the early warning state value Status is a second early warning value Level2, setting a timer Period3, setting the value of Period3 As U3, recording the current highest temperature value Wx, simultaneously starting the timer Period3, recording the current highest temperature value Wy when the timer Period3 is up, calculating the temperature rise value As1 of the current unit time As Wy-Wx, periodically starting the timer Period3, recording the current highest temperature value each time the time is up, recording a temperature rise value sequence, setting the temperature rise value sequence As2 and As3 … … AsN, comparing the temperature rise value AsN with a temperature rise threshold value A3, and if the number of continuous exceeding threshold values A3 is greater than or equal to the temperature rise time threshold value N3, the highest temperature value is greater than W1, and the temperature difference value is greater than a temperature difference threshold value V2, setting the current early warning state value Status As a third early warning value 3;
when the early warning state value Status is a third early warning value level3, if the highest temperature value is lower than a temperature threshold value W1, a Timer1 is started, the value of the Timer1 is set to T, if the highest temperature value is higher than a temperature threshold value W1 during the running of the Timer1, the Timer1 is stopped, and if the highest temperature value is lower than the temperature threshold value W1 within a continuously set time length, the current early warning state value is set to be a normal state value normal when the Timer1 is up;
when the early warning state value Status is a third early warning value Level3, if the temperature difference value is lower than a temperature difference threshold value V2, a Timer2 is started, the value of the Timer2 is set to T, if the temperature difference value is higher than a temperature difference threshold value V2 in the running process of the Timer2, the Timer2 is stopped, if the temperature difference value is continuously lower than the temperature difference threshold value V2, when the Timer2 is up, whether the current highest temperature value is larger than or equal to a temperature threshold value W1 or not is judged, if yes, the current early warning state value is set to be a first early warning value Level1, and if not, the current early warning state value is set to be a normal state value normal;
s6, when the early warning state value Status is a third early warning value level3, if the temperature rise value is smaller than A3 and the number of A3 continuously smaller than the threshold value is larger than or equal to N3, judging the temperature difference value and the highest temperature value:
if the temperature difference value is greater than or equal to the temperature difference threshold value V2 and the highest temperature value is greater than or equal to W1, setting the current early warning state value as a second early warning value Level 2; if the temperature difference value is less than or equal to the temperature difference threshold value V2 and the highest temperature value is greater than or equal to the temperature threshold value W1, setting the current early warning state value as a first early warning value Level 1;
if the value of the highest temperature is smaller than the temperature threshold value W1, setting the current early warning state value as a normal state value normal;
and S7, the system gives an early warning according to the early warning state value.
The invention has the beneficial effects that: according to the invention, by setting the sampling period, according to the frame rate of the thermal infrared imager and the rotation characteristic of the carbon brush, the sufficient measurement can be ensured by the period calculation mode provided by the invention, the waste of setting longer measurement sampling time is avoided while the measurement is carried out on all the carbon brushes without dead angles, and the system is prevented from being incapable of analyzing and warning in time. The system compares the acquired data in each measurement period, selects the highest temperature value, performs online safety analysis and early warning on the carbon brush, and improves the timeliness and early warning and pre-control capability of the operation decision of the power plant.
Drawings
FIG. 1 is a flow diagram of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1, the method for detecting and setting the early warning state of the carbon brush according to the present invention includes the steps of:
s1, collecting the working temperature of the carbon brush by using a thermal infrared imager;
s2, setting a temperature threshold value W1, a temperature difference threshold value V2 and a temperature rise threshold value A3, setting a temperature rise recording unit time value U3 and setting a temperature rise time threshold value N3; setting a delay time value T;
s3, controlling the thermal infrared imager to measure the temperature, and setting the measurement period as Tmeas, the rotating speed of the carbon brush as Vangle and the field angle of the thermal infrared imager as theta1And if the distance from the thermal infrared imager to the nearest carbon brush is d, the radius of a circle formed by the carbon brush device is R, and the frame rate of the thermal infrared imager is Nframe, then:
s4, when the highest temperature of the carbon brush collected by the thermal infrared imager is higher than a temperature threshold value W1, starting a Timer1, and setting the value of the Timer1 as T; during the running of the Timer1, if the highest temperature is lower than the temperature threshold value W1, the Timer1 is stopped; if the highest temperature is continuously higher than the temperature threshold value W1, when the Timer1 expires, the current early warning state value Status is set as a first early warning state value Level1, and the difference value V between the highest temperature and the lowest temperature of the carbon brush collected by the thermal infrared imager is recordedm；
S5, when the early warning state value Status is a first early warning value Level1, if the highest temperature value is lower than a temperature threshold value W1, a Timer1 is started, and the value of the Timer1 is set to be T; in the running process of the Timer1, if the highest temperature value is higher than a temperature threshold value W1, the Timer1 is stopped, and if the highest temperature value is continuously lower than a temperature threshold value W1, the current early warning state value is set to be a normal state value normal when the Timer1 is up;
when the early warning state value Status is a first early warning value Level1, if a difference value Vm of the highest temperature and the lowest temperature is higher than a temperature difference threshold value V2, a Timer2 is started, the value of the Timer2 is set to be T, and during the running period of the Timer2, if the temperature difference value Vm is lower than a temperature difference threshold value V2, the Timer2 is stopped; during the running period of the Timer2, if the temperature difference value is continuously higher than a temperature difference threshold value V2 and the highest temperature value is larger than a temperature threshold value W1, setting the current early warning state value Status as a second early warning value Level2 when the Timer2 is up;
when the early warning state value Status is a second early warning value Level2, if the highest temperature value is lower than a temperature threshold value W1, a Timer1 is started, the value of the Timer1 is set to T, if the highest temperature value is higher than a temperature threshold value W1 during the running of the Timer1, the Timer1 is stopped, and if the highest temperature value is lower than the temperature threshold value W1 within a continuously set time length, the current early warning state value is set to be a normal state value normal when the Timer1 is up;
when the early warning state value Status is a second early warning value Level2, if the temperature difference value is lower than a temperature difference threshold value V2, a Timer2 is started, the value of the Timer2 is set to T, if the temperature difference value is higher than a temperature difference threshold value V2 in the running process of the Timer2, the Timer2 is stopped, if the temperature difference value is lower than the temperature difference threshold value V2 within the continuously set time length, when the Timer2 is up, whether the current highest temperature value is larger than or equal to a temperature threshold value W1 or not is judged, if yes, the current early warning state value is set as a first-Level 1, otherwise, the current early warning state value is set as a normal state value normal;
when the early warning state value Status is a second early warning value Level2, setting a timer Period3, setting the value of Period3 As U3, recording the current highest temperature value Wx, simultaneously starting the timer Period3, recording the current highest temperature value Wy when the timer Period3 is up, calculating the temperature rise value As1 of the current unit time As Wy-Wx, periodically starting the timer Period3, recording the current highest temperature value each time the time is up, recording a temperature rise value sequence, setting the temperature rise value sequence As2 and As3 … … AsN, comparing the temperature rise value AsN with a temperature rise threshold value A3, and if the number of continuous exceeding threshold values A3 is greater than or equal to the temperature rise time threshold value N3, the highest temperature value is greater than W1, and the temperature difference value is greater than a temperature difference threshold value V2, setting the current early warning state value Status As a third early warning value 3;
when the early warning state value Status is a third early warning value level3, if the highest temperature value is lower than a temperature threshold value W1, a Timer1 is started, the value of the Timer1 is set to T, if the highest temperature value is higher than a temperature threshold value W1 during the running of the Timer1, the Timer1 is stopped, and if the highest temperature value is lower than the temperature threshold value W1 within a continuously set time length, the current early warning state value is set to be a normal state value normal when the Timer1 is up;
when the early warning state value Status is a third early warning value Level3, if the temperature difference value is lower than a temperature difference threshold value V2, a Timer2 is started, the value of the Timer2 is set to T, if the temperature difference value is higher than a temperature difference threshold value V2 in the running process of the Timer2, the Timer2 is stopped, if the temperature difference value is continuously lower than the temperature difference threshold value V2, when the Timer2 is up, whether the current highest temperature value is larger than or equal to a temperature threshold value W1 or not is judged, if yes, the current early warning state value is set to be a first early warning value Level1, and if not, the current early warning state value is set to be a normal state value normal;
s6, when the early warning state value Status is a third early warning value level3, if the temperature rise value is smaller than A3 and the number of A3 continuously smaller than the threshold value is larger than or equal to N3, judging the temperature difference value and the highest temperature value:
if the temperature difference value is greater than or equal to the temperature difference threshold value V2 and the highest temperature value is greater than or equal to W1, setting the current early warning state value as a second early warning value Level 2; if the temperature difference value is less than or equal to the temperature difference threshold value V2 and the highest temperature value is greater than or equal to the temperature threshold value W1, setting the current early warning state value as a first early warning value Level 1;
if the value of the highest temperature is smaller than the temperature threshold value W1, setting the current early warning state value as a normal state value normal;
and S7, the system gives an early warning according to the early warning state value.
The sampling period is set according to the frame rate of the thermal infrared imager and the rotation characteristic of the carbon brush, and the period calculation mode provided by the invention can ensure that the full measurement can be realized, and the long measurement sampling time is prevented from being wasted and set while all the carbon brushes are measured without dead angles, so that the system cannot analyze and warn in time. The system compares the collected data during each measurement cycle and selects the highest temperature value.
According to the invention, by setting the sampling period, according to the frame rate of the thermal infrared imager and the rotation characteristic of the carbon brush, the sufficient measurement can be ensured by the period calculation mode provided by the invention, the waste of setting longer measurement sampling time is avoided while the measurement is carried out on all the carbon brushes without dead angles, and the system is prevented from being incapable of analyzing and warning in time. The system compares the acquired data in each measurement period, selects the highest temperature value, performs online safety analysis and early warning on the carbon brush, and improves the timeliness and early warning and pre-control capability of the operation decision of the power plant.
The technical solution of the present invention is not limited to the limitations of the above specific embodiments, and all technical modifications made according to the technical solution of the present invention fall within the protection scope of the present invention.
Claims (1)
1. A method for setting carbon brush detection and early warning states is characterized by comprising the following steps:
s1, collecting the working temperature of the carbon brush by using a thermal infrared imager;
s2, setting a temperature threshold value W1, a temperature difference threshold value V2 and a temperature rise threshold value A3, setting a temperature rise recording unit time value U3 and setting a temperature rise time threshold value N3; setting a delay time value T;
s3, controlling the thermal infrared imager to measure the temperature, and setting the measurement period as Tmeas, the rotating speed of the carbon brush as Vangle and the field angle of the thermal infrared imager as theta1And if the distance from the thermal infrared imager to the nearest carbon brush is d, the radius of a circle formed by the carbon brush device is R, and the frame rate of the thermal infrared imager is Nframe, then:
s4, when the highest temperature of the carbon brush collected by the thermal infrared imager is higher than a temperature threshold value W1, starting a Timer1, and setting the value of the Timer1 as T;
during the running of the Timer1, if the highest temperature is lower than the temperature threshold value W1, the Timer1 is stopped; if the highest temperature is continuously higher than the temperature threshold value W1, when the Timer1 expires, the current early warning state value Status is set as a first early warning state value Level1, and the difference value V between the highest temperature and the lowest temperature of the carbon brush collected by the thermal infrared imager is recordedm；
S5, when the early warning state value Status is a first early warning value Level1, if the highest temperature value is lower than a temperature threshold value W1, a Timer1 is started, and the value of the Timer1 is set to be T; in the running process of the Timer1, if the highest temperature value is higher than a temperature threshold value W1, the Timer1 is stopped, and if the highest temperature value is continuously lower than a temperature threshold value W1, the current early warning state value is set to be a normal state value normal when the Timer1 is up;
when the early warning state value Status is a first early warning value Level1, if a difference value Vm of the highest temperature and the lowest temperature is higher than a temperature difference threshold value V2, a Timer2 is started, the value of the Timer2 is set to be T, and during the running period of the Timer2, if the temperature difference value Vm is lower than a temperature difference threshold value V2, the Timer2 is stopped; during the running period of the Timer2, if the temperature difference value is continuously higher than a temperature difference threshold value V2 and the highest temperature value is larger than a temperature threshold value W1, setting the current early warning state value Status as a second early warning value Level2 when the Timer2 is up;
when the early warning state value Status is a second early warning value Level2, if the highest temperature value is lower than a temperature threshold value W1, a Timer1 is started, the value of the Timer1 is set to T, if the highest temperature value is higher than a temperature threshold value W1 during the running of the Timer1, the Timer1 is stopped, and if the highest temperature value is lower than the temperature threshold value W1 within a continuously set time length, the current early warning state value is set to be a normal state value normal when the Timer1 is up;
when the early warning state value Status is a second early warning value Level2, if the temperature difference value is lower than a temperature difference threshold value V2, a Timer2 is started, the value of the Timer2 is set to T, if the temperature difference value is higher than a temperature difference threshold value V2 in the running process of the Timer2, the Timer2 is stopped, if the temperature difference value is lower than the temperature difference threshold value V2 within the continuously set time length, when the Timer2 is up, whether the current highest temperature value is larger than or equal to a temperature threshold value W1 or not is judged, if yes, the current early warning state value is set as a first-Level 1, otherwise, the current early warning state value is set as a normal state value normal;
when the early warning state value Status is a second early warning value Level2, setting a timer Period3, setting the value of Period3 As U3, recording the current highest temperature value Wx, simultaneously starting the timer Period3, recording the current highest temperature value Wy when the timer Period3 is up, calculating the temperature rise value As1 of the current unit time As Wy-Wx, periodically starting the timer Period3, recording the current highest temperature value each time the time is up, recording a temperature rise value sequence, setting the temperature rise value sequence As2 and As3 … … AsN, comparing the temperature rise value AsN with a temperature rise threshold value A3, and if the number of continuous exceeding threshold values A3 is greater than or equal to the temperature rise time threshold value N3, the highest temperature value is greater than W1, and the temperature difference value is greater than a temperature difference threshold value V2, setting the current early warning state value Status As a third early warning value 3;
when the early warning state value Status is a third early warning value level3, if the highest temperature value is lower than a temperature threshold value W1, a Timer1 is started, the value of the Timer1 is set to T, if the highest temperature value is higher than a temperature threshold value W1 during the running of the Timer1, the Timer1 is stopped, and if the highest temperature value is lower than the temperature threshold value W1 within a continuously set time length, the current early warning state value is set to be a normal state value normal when the Timer1 is up;
when the early warning state value Status is a third early warning value Level3, if the temperature difference value is lower than a temperature difference threshold value V2, a Timer2 is started, the value of the Timer2 is set to T, if the temperature difference value is higher than a temperature difference threshold value V2 in the running process of the Timer2, the Timer2 is stopped, if the temperature difference value is continuously lower than the temperature difference threshold value V2, when the Timer2 is up, whether the current highest temperature value is larger than or equal to a temperature threshold value W1 or not is judged, if yes, the current early warning state value is set to be a first early warning value Level1, and if not, the current early warning state value is set to be a normal state value normal;
s6, when the early warning state value Status is a third early warning value level3, if the temperature rise value is smaller than A3 and the number of A3 continuously smaller than the threshold value is larger than or equal to N3, judging the temperature difference value and the highest temperature value:
if the temperature difference value is greater than or equal to the temperature difference threshold value V2 and the highest temperature value is greater than or equal to W1, setting the current early warning state value as a second early warning value Level 2; if the temperature difference value is less than or equal to the temperature difference threshold value V2 and the highest temperature value is greater than or equal to the temperature threshold value W1, setting the current early warning state value as a first early warning value Level 1;
if the value of the highest temperature is smaller than the temperature threshold value W1, setting the current early warning state value as a normal state value normal;
and S7, the system gives an early warning according to the early warning state value.
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