CN109541357A - Rate of temperature change differential technique electrical equipment ageing management system and detection method - Google Patents
Rate of temperature change differential technique electrical equipment ageing management system and detection method Download PDFInfo
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Abstract
The present invention relates to electrical equipment ageing management technologies, rate of temperature change differential technique electrical equipment ageing management system, wherein the measurement end of temperature sensor group is respectively inside electric appliance connecting wire, bus and running environment are electrically connected, the signal output end of temperature sensor group and the signal input part of filter unit are electrically connected, the signal output end of filter unit and the signal input part of wireless transmission unit are electrically connected, the signal input part of alarm unit and the signal output end of microprocessor are electrically connected, the signal output end of control instruction input unit and the control signal input of microprocessor are electrically connected, the communication interface of microprocessor is electrically connected by communication unit and industrial computer, it can be judged according to degree of aging of the rate of temperature change to electrical equipment.The present invention also provides rate of temperature change differential technique electrical equipment degradation detecting methods.
Description
Technical Field
The invention relates to an electrical equipment aging detection technology, in particular to a temperature change rate difference method electrical equipment aging detection system and a detection technology.
Background
Electric power has become an important energy source in life and production, and has been deeply introduced into various fields of national economy such as industry, agriculture, aerospace, medical treatment and the like. The electrical equipment is a general name of equipment such as a generator, a transformer, a power line, a circuit breaker, a motor and the like in a power system, belongs to carriers for generating, transmitting, converting and using electric energy, and has safety directly related to the stability of the power system and the quality level of life of people. Electrical equipment is often used in harsh environments such as humid, high and low temperature, corrosive, flammable and explosive gas and the like, and faults such as aging, insulation breakdown, electrical fire and the like are easy to occur.
Disclosure of Invention
In order to solve the problems, the electrical equipment aging detection system based on the temperature change rate difference method provided by the invention utilizes the principle that contact resistance is increased (temperature is increased) due to aging, online monitors the temperature of the internal connecting wire, the bus and the operating environment temperature of the electrical equipment in the operating process, and judges the aging degree of the electrical equipment according to the temperature change rate, thereby laying a foundation for the development of intelligent inspection and evaluation technology of the electrical equipment. In addition, the invention also discloses a method for detecting the aging of the electrical equipment by using the temperature change rate difference method.
In order to achieve the purpose, the invention adopts the technical scheme that:
in the first technical scheme, the aging detection system of the electrical equipment by the temperature change rate difference method comprises a microprocessor, a wireless transmission unit, a filtering unit, a temperature sensor group, an alarm unit, a parameter setting unit, a control instruction input unit, a communication unit, an industrial computer and electrical equipment,
the measuring end of the temperature sensor group is respectively connected with a wire, a bus and an operating environment in the electrical equipment, the signal output end of the temperature sensor group is electrically connected with the signal input end of the filter unit, the signal output end of the filter unit is in signal connection with the signal input end of the wireless transmission unit, the signal output end of the wireless transmission unit is electrically connected with the signal input end of the microprocessor through a wireless network, the signal input end of the alarm unit is electrically connected with the signal output end of the microprocessor, the signal output end of the parameter setting unit is electrically connected with the parameter signal input end of the microprocessor, the signal output end of the control instruction input unit is electrically connected with the control signal input end of the microprocessor, and the communication interface of the microprocessor is electrically connected with the industrial computer through the communication unit.
In the first technical solution, preferably, the system for detecting aging of electrical equipment by using a temperature change rate difference method further includes a display unit, and a signal input end of the display unit is electrically connected with a display signal output end of the microprocessor.
In a second technical solution, a method for detecting aging of an electrical device by a differential temperature change method, using the system for detecting aging of an electrical device by a differential temperature change method as described in the first technical solution, includes the following steps:
step 1, electrifying a system, and setting parameters of the system acquisition path number, a temperature rise change rate coefficient and a multiplying power coefficient;
step 2, inputting a temperature detection starting signal into a control instruction input unit;
step 3, the microprocessor collects signals of the temperature sensor group, processes the data, and displays and transmits the data;
and 4, alarming when the temperature change rate exceeds a set value, and sending an alarm signal to an industrial computer.
In the second technical means, preferably, in the step 3, the method comprises
Step 31, the microprocessor starts to calculate the temperature change rate after collecting 3 temperature data, and the 3 rd temperature signal records U0The 4 th temperature signal is recorded as U1Sequentially record to Un(n +3) th temperature signal), converting the temperature data into a temperature value according to the characteristic relation of the temperature sensor, and calculating the formula as follows:
wherein: t is temperature in units of; q is the measuring range of the temperature sensor and the unit is; u shapesThe unit is V, and the voltage is corresponding to the maximum measuring range; u is feedback voltage of the temperature sensor and has the unit of V;
step 32, converting the temperature data into a temperature change rate, wherein a conversion formula is as follows:
ΔT＝Tn-Tn-1(2)
wherein: delta T is the rate of temperature change in units of; t isnIs the nth temperature value with the unit of ℃ and n is a positive integer; t isn-1Is the (n-1) th temperature value and has the unit of;
step 33, obtaining the temperature change rates of the internal monitoring points of the electrical equipment and the operating environment through calculation and recording the temperature change rates as delta T respectivelyn1And Δ Tn2And calculating the absolute value of the difference between the two values:
P＝|ΔTn1-ΔTn2| (3)
wherein, P is the temperature rise change rate difference value, and the unit is;
step 34, calculating the temperature rise change rate difference value P and K times of temperature change rate delta T of the internal monitoring point of the electrical equipmentn1A difference value according to the following formula:
Q＝P-K×ΔTn1(4)
q is the temperature rise change rate difference value P and K times of the temperature change rate delta T of the monitoring point in the electrical equipmentn1The difference in units of; k is a temperature rise change rate coefficient and is dimensionless; if Q is larger than 0, judging that the temperature change rate is too high, and the internal monitoring point of the electrical equipment has aging risk.
In the second technical means, preferably, in the step 3, the method comprises
Step 35, during temperature data acquisition, taking M data as a data processing small period (after acquiring N data, a first small period starts to be established, N is greater than M, if there is interference data in the M data in the small period, the forward data is taken to replace the re-established small period), and calculating an average value of the data in the small period, namely:
wherein,the average value of data in a small period is V; m is a small data processing period and is dimensionless; u shapeiThe unit V, i is a positive integer of voltage data in a small period; and performing difference operation on the data in the small period and the average value of the data, then taking an absolute value, and comparing, wherein the calculation process is as follows:
wherein, F is a voltage signal comparison parameter with the unit of V; s is a voltage signal comparison coefficient and is dimensionless; the voltage signal comparison parameter F is calculated as follows:
if equation (6) holds, data UiThe microprocessor stores the non-interference data and calculates the non-interference data in the next step; if formula (6) does not hold, rejecting data UiAnd supplementing data by adopting a mean multiplying power derivation method, removing interference data, taking a piece of data ahead, reestablishing a small period, and continuously processing the data according to a small period mean comparison method.
In the second technical means, preferably, in step 35, the method comprises
And step 36, if the formula (6) is established, supplementing and removing data by multiplying the newly calculated small-period data average value by a multiplying factor, wherein the calculation formula is as follows:
wherein, UiData of mean multiplying power derivation method is shown in unit V;newly established data average value in a small period, wherein the unit is V; m is a multiplying factor and is dimensionless.
The beneficial effects of the invention are as follows:
the invention utilizes the principle that contact resistance is increased (temperature is increased) due to aging, and judges the aging degree of the electrical equipment according to the temperature change rate by monitoring the temperature of the internal connecting wire and the bus of the electrical equipment and the temperature of the operating environment in the operating process of the electrical equipment on line, thereby improving the safety and reliability of the electrical equipment, avoiding the safety production accident caused by the failure of the electrical equipment, laying a foundation for the development of the intelligent inspection and evaluation technology of the electrical equipment, and having important theoretical and practical significance for guaranteeing social stability and the safety of lives and properties of people.
Drawings
FIG. 1 is a schematic diagram of a system structure of a system for detecting aging of electrical equipment by a temperature change rate difference method according to the present invention.
FIG. 2 is a flowchart of the aging detection method of electrical equipment by temperature change rate difference method according to the present invention.
The reference numerals include:
1-a microprocessor, 2-a wireless transmission unit, 3-a filtering unit, 4-a temperature sensor group, 5-an alarm unit, 6-a parameter setting unit, 7-a control instruction input unit, 8-a display unit, 9-a communication unit, 10-an industrial computer, 11-electrical equipment and 12-an operating environment.
Detailed Description
In order to make the purpose, technical solution and advantages of the present technical solution more clear, the present technical solution is further described in detail below with reference to specific embodiments. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present teachings.
Example 1
As shown in fig. 1, the present embodiment provides a system for detecting aging of electrical equipment by temperature change rate difference method, which comprises a microprocessor 1, a wireless transmission unit 2, a filtering unit 3, a temperature sensor group 4, an alarm unit 5, a parameter setting unit 6, a control instruction input unit 7, a communication unit 9, an industrial computer 10 and an electrical equipment 11, wherein a measuring end of the temperature sensor group 4 is electrically connected to an internal connecting wire, a bus and an operating environment 12 of the electrical equipment 11, respectively, a signal output end of the temperature sensor group 4 is electrically connected to a signal input end of the filtering unit 3, a signal output end of the filtering unit 3 is signal-connected to a signal input end of the wireless transmission unit 2, a signal output end of the wireless transmission unit 2 is electrically connected to a signal input end of the microprocessor 1 through a wireless network, a signal input end of the alarm unit 5 is electrically connected to a signal output end of the microprocessor 1, the signal output end of the parameter setting unit 6 is electrically connected with the parameter signal input end of the microprocessor 1, the signal output end of the control instruction input unit 7 is electrically connected with the control signal input end of the microprocessor 1, and the communication interface of the microprocessor 1 is electrically connected with the industrial computer 10 through the communication unit 9.
The electrical equipment aging detection system adopting the temperature change rate difference method further comprises a display unit 8, and a signal input end of the display unit 8 is electrically connected with a display signal output end of the microprocessor 1.
Example 2
As shown in fig. 2, the present embodiment provides a method for detecting aging of an electrical device by a temperature change rate difference method, which uses a system for detecting aging of an electrical device by a temperature change rate difference method as in the first technical solution, and includes the following steps:
step 1, electrifying a system, and setting parameters of the system acquisition path number, a temperature rise change rate coefficient and a multiplying power coefficient;
step 2, inputting a temperature detection starting signal into a control instruction input unit 7;
step 3, the microprocessor 1 collects signals of the temperature sensor group 4, processes the data, and displays and transmits the data;
and 4, alarming when the temperature change rate exceeds a set value, and sending an alarm signal to the industrial computer 10.
Preferably, step 3 comprises
Step 31, the microprocessor 1 starts to calculate the temperature change rate after collecting 3 temperature data, and the 3 rd temperature signal record U0The 4 th temperature signal is recorded as U1Sequentially record to Un(nth temperature signal), converting the temperature data into temperature value according to the characteristic relation of the temperature sensor, and calculating formula as follows:
wherein: t is temperature in units of; q is the measuring range of the temperature sensor and the unit is; u shapesThe unit is V, and the voltage is corresponding to the maximum measuring range; u is feedback voltage of the temperature sensor and has the unit of V;
step 32, converting the temperature data into a temperature change rate, wherein a conversion formula is as follows:
ΔT＝Tn-Tn-1(2)
wherein: delta T is the rate of temperature change in units of; t isnIs the nth temperature value with the unit of ℃ and n is a positive integer; t isn-1Is the (n-1) th temperature value and has the unit of;
step 33, obtaining the temperature change rates of the internal monitoring point of the electrical equipment 11 and the operating environment 12 through calculation and recording the temperature change rates as delta T respectivelyn1And Δ Tn2Calculating the absolute value of the difference between the two：
P＝|ΔTn1-ΔTn2| (3)
Wherein, P is the temperature rise change rate difference value, and the unit is;
step 34, calculating the temperature rise change rate difference P and K times of the temperature change rate delta T of the monitoring point in the electrical equipment 11n1A difference value according to the following formula:
Q＝P-K×ΔTn1(4)
wherein Q is the temperature rise change rate difference P and K times the temperature change rate delta T of the monitoring point in the electrical equipment 11n1The difference in units of; k is a temperature rise change rate coefficient and is dimensionless; if Q is larger than 0, the temperature change rate is judged to be too high, and the monitoring point in the electrical equipment 11 has aging risk.
Preferably, step 3 comprises
Step 35, during temperature data acquisition, taking M data as a data processing small period (after acquiring N data, a first small period starts to be established, N is greater than M, if there is interference data in the M data in the small period, the forward data is taken to replace the re-established small period), and calculating an average value of the data in the small period, namely:
wherein,the average value of data in a small period is V; m is a small data processing period and is dimensionless; u shapeiThe unit V, i is a positive integer of voltage data in a small period; and performing difference operation on the data in the small period and the average value of the data, then taking an absolute value, and comparing, wherein the calculation process is as follows:
wherein, F is a voltage signal comparison parameter with the unit of V; s is a voltage signal comparison coefficient and is dimensionless; the voltage signal comparison parameter F is calculated as follows:
if equation (6) holds, data UiThe microprocessor 1 stores and calculates the non-interference data; if formula (6) does not hold, rejecting data UiAnd supplementing data by adopting a mean multiplying power derivation method, removing interference data, taking a piece of data ahead, reestablishing a small period, and continuously processing the data according to a small period mean comparison method.
Preferably, in step 35, the method comprises
And step 36, if the formula (6) is established, supplementing and removing data by multiplying the newly calculated small-period data average value by a multiplying factor, wherein the calculation formula is as follows:
wherein, UiData of mean multiplying power derivation method is shown in unit V;newly established data average value in a small period, wherein the unit is V; m is a multiplying factor and is dimensionless.
The invention utilizes the principle that contact resistance is large due to aging, online monitors the temperature of the internal connecting wire and the bus of the electrical equipment 11 and the temperature of the operating environment 12 in the operating process, judges the aging degree of the electrical equipment 11 according to the temperature change rate, improves the safety and reliability of the electrical equipment 11, avoids safety production accidents caused by the faults of the electrical equipment 11, lays a foundation for the development of intelligent detection and evaluation technology of the electrical equipment 11, and has important theoretical and practical significance for guaranteeing social stability and the safety of lives and properties of people.
The foregoing is only a preferred embodiment of the present invention, and many variations in the specific embodiments and applications of the invention may be made by those skilled in the art without departing from the spirit of the invention, which falls within the scope of the claims of this patent.
Claims (6)
1. Temperature rate of change difference method electrical equipment aging detecting system which characterized in that: comprises a microprocessor, a wireless transmission unit, a filtering unit, a temperature sensor group, an alarm unit, a parameter setting unit, a control instruction input unit, a communication unit, an industrial computer and electrical equipment,
the measuring end of the temperature sensor group is respectively connected with a wire, a bus and an operating environment in the electrical equipment, the signal output end of the temperature sensor group is electrically connected with the signal input end of the filter unit, the signal output end of the filter unit is electrically connected with the signal input end of the wireless transmission unit, the signal output end of the wireless transmission unit is electrically connected with the signal input end of the microprocessor through a wireless network, the signal input end of the alarm unit is electrically connected with the signal output end of the microprocessor, the signal output end of the parameter setting unit is electrically connected with the parameter signal input end of the microprocessor, the signal output end of the control instruction input unit is electrically connected with the control signal input end of the microprocessor, and the communication interface of the microprocessor is electrically connected with the industrial computer through the communication unit.
2. The system according to claim 1, wherein the system comprises: the temperature change rate difference method electrical equipment aging detection system further comprises a display unit, and a signal input end of the display unit is electrically connected with a display signal output end of the microprocessor.
3. A method for detecting the deterioration of an electrical device by a differential temperature change method, using the system for detecting the deterioration of an electrical device by a differential temperature change method according to claims 1 and 2, comprising the steps of:
step 1, electrifying a system, and setting parameters of the system acquisition path number, a temperature rise change rate coefficient and a multiplying power coefficient;
step 2, inputting a temperature detection starting signal into a control instruction input unit;
step 3, the microprocessor collects signals of the temperature sensor group, processes the data, and displays and transmits the data;
and 4, alarming when the temperature change rate exceeds a set value, and sending an alarm signal to an industrial computer.
4. The method for detecting aging of electrical equipment by differential temperature change according to claim 3, characterized in that: in step 3, comprising
Step 31, the microprocessor starts to calculate the temperature change rate after collecting 3 temperature data, and the 3 rd temperature signal recordsU0The 4 th temperature signal is recorded as U1Sequentially recording the (n +3) th temperature signal UnConverting the temperature data into a temperature value according to the characteristic relation of the temperature sensor, wherein the calculation formula is as follows:
wherein: t is temperature in units of; q is the measuring range of the temperature sensor and the unit is; u shapesThe unit is V, and the voltage is corresponding to the maximum measuring range; u is feedback voltage of the temperature sensor and has the unit of V;
step 32, converting the temperature data into a temperature change rate, wherein a conversion formula is as follows:
ΔT＝Tn-Tn-1(2)
wherein: delta T is the rate of temperature change in units of; t isnIs the nth temperature value with the unit of ℃ and n is a positive integer; t isn-1Is the (n-1) th temperature value and has the unit of;
step 33, obtaining the temperature change rates of the internal monitoring points of the electrical equipment and the operating environment through calculation and recording the temperature change rates as delta T respectivelyn1And Δ Tn2And calculating the absolute value of the difference between the two values:
P＝|ΔTn1-ΔTn2| (3)
wherein, P is the temperature rise change rate difference value, and the unit is;
step 34, calculating the temperature rise change rate difference value P and K times of temperature change rate delta T of the internal monitoring point of the electrical equipmentn1A difference value according to the following formula:
Q＝P-K×ΔTn1(4)
q is the temperature rise change rate difference value P and K times of the temperature change rate delta T of the monitoring point in the electrical equipmentn1The difference in units of; k is a temperature rise change rate coefficient and is dimensionless; if Q is larger than 0, judging that the temperature change rate is too high, and the internal monitoring point of the electrical equipment has aging risk.
5. The method for detecting aging of electrical equipment by differential temperature change according to claim 4, wherein: in step 3, comprising
Step 35, during temperature data acquisition, taking M data as a data processing small period, starting to establish a first small period after acquiring N data, wherein N is greater than M, if interference data exist in the M data in the small period, replacing the forward data with the re-established small period, and calculating an average value of the data in the small period, namely:
wherein,the average value of data in a small period is V; m is a small data processing period and is dimensionless; u shapeiThe unit V, i is a positive integer of voltage data in a small period; and performing difference operation on the data in the small period and the average value of the data, then taking an absolute value, and comparing, wherein the calculation process is as follows:
wherein, F is a voltage signal comparison parameter with the unit of V; s is a voltage signal comparison coefficient and is dimensionless; the voltage signal comparison parameter F is calculated as follows:
if equation (6) holds, data UiThe microprocessor stores the non-interference data and calculates the non-interference data in the next step; if formula (6) does not hold, rejecting data UiAnd supplementing data by adopting a mean multiplying power derivation method, removing interference data, taking a piece of data ahead, reestablishing a small period, and continuously processing the data according to a small period mean comparison method.
6. The method for detecting aging of electrical equipment by differential temperature change according to claim 5, characterized in that: in step 35, include
And step 36, if the formula (6) is established, supplementing and removing data by multiplying the newly calculated small-period data average value by a multiplying factor, wherein the calculation formula is as follows:
wherein, UiData of mean multiplying power derivation method is shown in unit V;newly established data average value in a small period, wherein the unit is V; m is a multiplying factor and is dimensionless.
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| CN118129946A (en) * | 2024-05-10 | 2024-06-04 | 山东中慧环保科技有限公司 | Method and device for monitoring electrode state of ozone generator |
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