CN113206545B - Power plant station inspection method and device - Google Patents
Power plant station inspection method and device Download PDFInfo
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- CN113206545B CN113206545B CN202110445845.1A CN202110445845A CN113206545B CN 113206545 B CN113206545 B CN 113206545B CN 202110445845 A CN202110445845 A CN 202110445845A CN 113206545 B CN113206545 B CN 113206545B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C1/00—Registering, indicating or recording the time of events or elapsed time, e.g. time-recorders for work people
- G07C1/20—Checking timed patrols, e.g. of watchman
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/045—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a thermal radiation sensor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Testing And Monitoring For Control Systems (AREA)
Abstract
The invention provides a power plant station inspection method which comprises the steps of periodically sensing the surface temperature of equipment to be detected; receiving the temperature sensed in each period, carrying out segmentation and detection according to a preset time unit, and simultaneously sending an alarm instruction and an action instruction if all the temperatures in the current segment are greater than or equal to a fault temperature threshold; or if all the temperatures in the current section are smaller than the fault temperature threshold, comparing on a two-dimensional coordinate axis by combining a preset temperature memory curve to judge whether all the temperatures in the current section are effective or not, and sending an alarm instruction when the judgment is invalid, and sending one of protection starting prediction information, the alarm instruction and an action instruction according to the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis when the judgment is valid; and when receiving the alarm instruction and the action instruction, alarming and acting. The invention can not only sense and judge the temperature of the equipment in real time, but also automatically alarm and protect the action.
Description
Technical Field
The invention relates to the technical field of power plant inspection, in particular to a method and a device for inspecting a power plant.
Background
Thermal destruction is one of the main causes of failure of electrical equipment. When the electric energy conduction path of the electric power equipment has unequal resistivity, the section with larger resistivity on the electric energy conduction path can generate more heat due to the thermal effect of the resistor, once the heat generation exceeds the heat dissipation performance, the thermal destruction occurs, and finally the damage of the electric power equipment and the failure of the electric energy conduction are caused. For example, in a transformer substation or a power plant, a connection portion between an outgoing line of a transformer and an outgoing line of a bus (a connection palm in an open plant, a connection rod in a closed device) is easily subjected to excessive contact resistance due to oxidation of metal on a contact surface, loosening of the contact portion, and the like, and finally an excessive heating point is formed.
At present, the processing mode aiming at the excessive heating points is to carry out manual inspection monitoring by utilizing infrared rays, when the heating points are found to exceed a standard value (if a transformer is 105 ℃), equipment operation maintenance personnel inform power scheduling personnel to carry out manual power failure, but real-time perception cannot be achieved, and faults cannot be timely eliminated. Taking the period of monthly patrol of the substation as an example, even if operation and maintenance personnel do not omit equipment monitoring, the fault equipment can be discovered only in one month at the longest.
Therefore, it is necessary to provide a method for inspecting a power station, which not only can sense and determine the temperature of the equipment in real time, but also can automatically alarm and protect actions.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a method and a device for patrolling and examining an electric power plant station, which not only can sense and judge the temperature of equipment in real time, but also can automatically alarm and protect actions.
In order to solve the above technical problem, an embodiment of the present invention provides an electric power plant inspection method for performing real-time temperature detection on a device to be detected in an electric power plant through an electric power plant inspection apparatus to implement alarm and action protection of a preset protection action apparatus, where the method includes the following steps:
the power station inspection device periodically senses the temperature of the surface of the equipment to be tested;
after receiving the temperature sensed in each period, carrying out segmentation and detection on the received temperature according to a preset time unit, and if detecting that all the temperatures in the current segment are greater than or equal to a fault temperature threshold, simultaneously sending an alarm instruction and an action instruction; or if all the temperatures in the current section are detected to be smaller than the fault temperature threshold value, comparing on a two-dimensional coordinate axis by combining a preset temperature memory curve to judge whether all the temperatures in the current section are effective or not, and sending an alarm instruction when the judgment is invalid, and sending one of protection starting prediction information, the alarm instruction and an action instruction according to the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis when the judgment is valid;
when the alarm instruction is received, alarming; and
and when the action instruction is received, acting to start the protection of the preset protection action device.
Wherein, if the power station inspection device detects that all temperatures in the current segment are less than the fault temperature threshold, the power station inspection device compares on a two-dimensional coordinate axis by combining a preset temperature memory curve to judge whether all temperatures in the current segment are effective or not, and the specific steps comprise:
when all temperatures in the current section are smaller than the fault temperature threshold value, determining the positions of all temperatures in the current section on the two-dimensional coordinate axis, comparing the offset by combining the preset temperature memory curve, and if the number of the temperatures which meet a first preset condition in the current section is larger than or equal to a preset value, judging that all temperatures in the current section are invalid; or if the number of the temperatures meeting the first preset condition in the current section is smaller than the preset value, judging that all the temperatures in the current section are effective; the first preset condition is that a positive and negative offset formed by a position of a certain temperature on the two-dimensional coordinate axis in the current section and the preset temperature memory curve exceeds a preset offset distance value.
When the power station inspection device is effective in judgment, the specific step of sending one of protection starting prediction information, an alarm instruction and an action instruction according to the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis comprises the following steps:
and when all the temperatures in the current section are judged to be effective, if the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis is greater than or equal to a first preset slope value, the action command is sent.
When the power station inspection device is effective in judgment, the specific step of sending one of protection starting prediction information, an alarm instruction and an action instruction according to the slope formed on the two-dimensional coordinate axis by all the temperatures in the current section further comprises the following steps:
and when all the temperatures in the current section are judged to be effective, if the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis is smaller than the first preset slope value and larger than or equal to a second preset slope value, the alarm instruction is sent.
When the power station inspection device is effective in judgment, the specific step of sending one of protection starting prediction information, an alarm instruction and an action instruction according to the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis further comprises the following steps:
when all the temperatures in the current segment are judged to be effective, if the slopes formed on the two-dimensional coordinate axes by all the temperatures in the current segment are smaller than the second preset slope value and larger than the third preset slope value, all the temperatures in the current segment and the slopes formed on the two-dimensional coordinate axes are combined with a preset action temperature threshold value for calculation, and the time required when the temperatures in the current segment reach the preset action temperature threshold value is obtained and sent as protection starting prediction information.
Wherein the method further comprises:
and the power plant inspection device sends the protection action starting prediction information to a preset operation and maintenance personnel monitoring system.
Wherein the first preset slope value is 1; the second preset slope value is 0.5; the third preset slope value is 0.
The embodiment of the invention also provides an electric power station inspection device which comprises an infrared sensor, a measurement monitor, an alarm instrument and an operation box; wherein the content of the first and second substances,
the infrared sensor is connected with the measurement monitor and is used for periodically sensing the temperature of the surface of the equipment to be measured;
the measurement monitor is used for segmenting and detecting the received temperature according to a preset time unit after receiving the temperature sensed in each period, and simultaneously sending an alarm instruction and an action instruction if all the temperatures in the current segment are detected to be greater than or equal to a fault temperature threshold value; or if all the temperatures in the current section are detected to be smaller than the fault temperature threshold value, comparing on a two-dimensional coordinate axis by combining a preset temperature memory curve to judge whether all the temperatures in the current section are effective or not, and sending an alarm instruction when the judgment is invalid, and sending one of protection starting prediction information, the alarm instruction and an action instruction according to the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis when the judgment is valid;
the alarm instrument is connected with the measurement monitor and is used for giving an alarm when receiving the alarm instruction;
the operation box is respectively connected with the measurement monitor and the preset protection action device and used for acting when receiving the action command so as to start the protection of the preset protection action device.
Wherein, the measurement monitor includes:
the receiving unit is used for receiving the temperature sensed in each period;
the segmentation and detection unit is used for segmenting and detecting the received temperature according to a preset time unit;
the first measurement judging unit is used for simultaneously sending an alarm instruction and an action instruction if all temperatures in the current section are detected to be greater than or equal to the fault temperature threshold;
and the second measurement judging unit is used for comparing on a two-dimensional coordinate axis by combining a preset temperature memory curve if all the temperatures in the current section are detected to be smaller than the fault temperature threshold value so as to judge whether all the temperatures in the current section are effective or not, sending an alarm instruction when the judgment is invalid, and sending one of protection starting prediction information, the alarm instruction and an action instruction according to the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis when the judgment is valid.
Wherein the second measurement judgment unit includes:
the effective temperature judging module is used for determining the positions of all the temperatures in the current section on the two-dimensional coordinate axis when all the temperatures in the current section are smaller than the fault temperature threshold, carrying out offset comparison by combining the preset temperature memory curve, and judging that all the temperatures in the current section are invalid if the number of the temperatures in the current section which meet the first preset condition is greater than or equal to a preset value; or if the number of the temperatures meeting the first preset condition in the current section is smaller than the preset value, judging that all the temperatures in the current section are effective; the first preset condition is that a positive and negative offset formed by a position of a certain temperature on the two-dimensional coordinate axis in the current section and the preset temperature memory curve exceeds a preset offset distance value;
the first temperature change rate judging module is used for sending the action instruction if the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis is greater than or equal to a first preset slope value when all the temperatures in the current section are judged to be effective;
the second temperature change rate judging module is used for sending the alarm instruction if the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis is smaller than the first preset slope value and larger than or equal to a second preset slope value when all the temperatures in the current section are judged to be effective;
and the third temperature change rate judgment module is used for calculating all the temperatures in the current section and the slopes formed on the two-dimensional coordinate axis of the temperatures in the current section in combination with a preset action temperature threshold value if all the temperatures in the current section are judged to be effective and the slopes formed on the two-dimensional coordinate axis of the temperatures in the current section are smaller than the second preset slope value and larger than a third preset slope value, so that the time required when the temperatures in the current section reach the preset action temperature threshold value is obtained and sent as protection starting prediction information.
The embodiment of the invention has the following beneficial effects:
based on the photo-thermal protection principle, under the limitation of a temperature memory curve (namely, judgment among a slope formed by temperature on a two-dimensional coordinate axis, a first preset slope value, a second preset slope value and a third preset slope value is introduced), protection misoperation is not easy to occur, the protection condition of non-short-circuit overheating faults of power equipment can be compensated, the conditions of oxidation heating of equipment connection points and ageing heating inside the equipment are particularly reliable, meanwhile, fault electrical quantity open logic (namely, judgment of fault temperature threshold values) is introduced for ensuring that the protection reliably acts when the equipment is in a short circuit, the action rejection of other protection cannot be caused, and the action reliability is improved. The intelligent automatic temperature sensing and alarm system has huge application prospects in intelligent and automatic operation and maintenance, can sense and judge the temperature of equipment in real time, and can automatically alarm and protect actions.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an inspection device for an electric power plant according to an embodiment of the present invention;
fig. 2 is a flowchart of an electric power plant inspection method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, in an embodiment of the present invention, an inspection apparatus for an electric power plant station includes an infrared sensor 1, a measurement monitor 2, an alarm 3, and an operation box 4; wherein the content of the first and second substances,
the infrared sensor 1 is connected with the measuring and monitoring instrument 2 and is used for periodically (such as 1 time per second) sensing the temperature of the surface of the equipment to be measured;
the measurement monitor 2 is used for segmenting and detecting the received temperature according to a preset time unit (such as every 1 minute) after receiving the temperature sensed in each period, and simultaneously sending an alarm instruction and an action instruction if all the temperatures in the current segment are detected to be greater than or equal to a fault temperature threshold (such as 3000 ℃); or if all the temperatures in the current section are detected to be smaller than the fault temperature threshold value, comparing on a two-dimensional coordinate axis by combining a preset temperature memory curve to judge whether all the temperatures in the current section are effective or not, and sending out an alarm instruction when the judgment is invalid, and sending out one of protection starting prediction information, the alarm instruction and an action instruction according to the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis when the judgment is valid;
the alarm instrument 3 is connected with the measurement monitor 2 and is used for giving an alarm when receiving an alarm instruction;
the operation box 4 is respectively connected with the measurement monitor 2 and a preset protection action device (not shown), and is used for acting to start the protection of the preset protection action device when receiving an action instruction.
It should be noted that, in the embodiment of the present invention, the inspection device for an electric power plant performs real-time temperature detection on a device to be detected in the electric power plant based on a photo-thermal protection principle, so as to implement alarm and action protection of a preset protection action device. Wherein, the protection principle that the light and heat protection principle formed on the basis of obtaining infrared ray intensity measurement value, infrared ray sensor 1 measuring frequency is 1 time per second, obtains 1 measurement value per second promptly, and this measurement value can be directly surveyed by infrared ray sensor 1's real-time light intensity numerical value, or measures the average calculation of the light intensity total amount in the fixed period and obtain. Therefore, the temperature division may be segmented based on time units or segmented based on number units (e.g., 60 temperatures are one number unit).
Meanwhile, based on the related knowledge in the technical field, the operation box 4 may include components such as an operational amplifier, a relay, a circuit breaker control circuit, and the like, so that when the operation box 4 receives an action instruction, the circuit breaker control circuit is actuated by controlling the open/close state of a normally open contact on the relay, so as to drive the preset protection actuation device to start protection.
When the equipment to be tested has short-circuit fault (such as short-circuit fault during insulation damage), a large amount of heat can be generated at the short-circuit point, and the temperature of the fault point can be rapidly increased to 3000 ℃. In the event of a short-circuit fault, the short-circuit point passes a large fault current and, with a reduction in voltage, generates a large amount of heat from the fault current over a certain period of time. The heat generation therefore lags behind the short-circuit current. In order to ensure that the protection reliably acts when the equipment is in short circuit, open logic of fault electrical quantity is introduced, the photothermal protection can directly carry out numerical judgment on the measurement numerical value of the equipment to be tested, and an alarm instruction and an action instruction are directly sent out.
It can be understood that the preset temperature memory curve is a measured value curve formed by fixed measured values (for example, 60) measured in history, and by comparing with the segmented temperature measured in real time, sudden change of the measured values caused by a fault of the infrared sensor 1 or a shielding of the surface of the device to be measured can be prevented.
In an embodiment of the present invention, the measurement monitor 2 includes: the device comprises a receiving unit, a segmenting and detecting unit, a first measurement judging unit and a second measurement judging unit; wherein, the first and the second end of the pipe are connected with each other,
the receiving unit is used for receiving the temperature sensed in each period;
the segmentation and detection unit is used for segmenting and detecting the received temperature according to a preset time unit;
the first measurement judging unit is used for simultaneously sending out an alarm instruction and an action instruction if all temperatures in the current section are detected to be greater than or equal to a fault temperature threshold;
and the second measurement judging unit is used for comparing on a two-dimensional coordinate axis by combining a preset temperature memory curve if all the temperatures in the current section are detected to be smaller than the fault temperature threshold value so as to judge whether all the temperatures in the current section are effective or not, sending an alarm instruction when the judgment is invalid, and sending one of protection starting prediction information, the alarm instruction and an action instruction according to the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis when the judgment is valid.
In the embodiment of the present invention, the second measurement determining unit of the measurement monitor 2 may specifically implement the following condition determination through the effective temperature determining module, the first temperature change rate determining module, the second temperature change rate determining module, and the third temperature change rate determining module:
(1) the effective temperature judging module is used for determining the positions of all the temperatures in the current section on a two-dimensional coordinate axis when all the temperatures in the current section are smaller than a fault temperature threshold, performing offset comparison by combining a preset temperature memory curve, and judging that all the temperatures in the current section are invalid if the number of the temperatures which meet a first preset condition in the current section is greater than or equal to a preset value (such as 12); or if the number of the temperatures meeting the first preset condition in the current section is smaller than a preset value (such as 12), judging that all the temperatures in the current section are effective; the first predetermined condition is that a positive and negative offset formed by a position of a certain temperature on the two-dimensional coordinate axis in the current segment and a preset temperature memory curve should exceed a predetermined offset distance value (e.g. 20%). That is, the number of times the temperature (latest measurement point value) in the current segment shifts from the temperature memory curve by more than 20% is 25% of the total number (60) in the current segment, and the temperature in the current segment is masked and is not substituted into the calculation logic. At this time, it is judged that the temperature measurement in the current segment fails, and all protection action logics are locked, so that other protection logics cannot act, and thus protection misoperation is prevented.
(2) And the first temperature change rate judging module is used for sending an action instruction if the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis is greater than or equal to a first preset slope value (such as 1) when all the temperatures in the current section are judged to be effective. Namely, the temperature is determined to increase too fast, the action command is output to realize the action of the outlet of the operation box 4, and meanwhile, the alarm command can be output to the alarm instrument 3 to alarm.
(3) And the second temperature change rate judging module is used for sending an alarm instruction if the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis is smaller than a first preset slope value (such as 1) and larger than or equal to a second preset slope value (such as 0.5) when all the temperatures in the current section are judged to be effective. Namely, the temperature is determined to increase rapidly, and an alarm instruction is output to the alarm 3 for alarming.
(4) A third temperature change rate determining module, configured to, when it is determined that all temperatures in the current segment are valid, determine whether a slope formed by all temperatures in the current segment on the two-dimensional coordinate axis is smaller than a second preset slope value (e.g., 0.5) and larger than a third preset slope valueThe slope value (such as 0) is obtained by comparing all the temperatures in the current segment and the slopes formed on the two-dimensional coordinate axis with a preset action temperature threshold (such as T)set) And (4) combining calculation to obtain the time required by the temperature in the current period reaching the preset action temperature threshold value and sending the time as protection starting prediction information. The temperature change condition can be predicted according to slopes formed by all temperatures in the current segment on a two-dimensional coordinate axis, the time required for rising to the action temperature threshold value can be obtained by combining the temperature change condition, and the time is further used as protection starting prediction information to be sent to an operation and maintenance personnel monitoring system to form predictive protection.
As shown in fig. 2, in an embodiment of the present invention, a method for inspecting an electric power plant station is provided, where the method is used to perform real-time temperature detection on a device to be tested in the electric power plant station through the electric power plant station inspection apparatus, so as to implement alarm and action protection of a preset protection action apparatus, and the method includes the following steps:
step S1, the power station inspection device periodically senses the surface temperature of the equipment to be tested;
step S2, after receiving the temperature sensed in each period, carrying out segmentation and detection on the received temperature according to a preset time unit, and if detecting that all the temperatures in the current segment are greater than or equal to a fault temperature threshold value, simultaneously sending an alarm instruction and an action instruction; or if all the temperatures in the current section are detected to be smaller than the fault temperature threshold value, comparing on a two-dimensional coordinate axis by combining a preset temperature memory curve to judge whether all the temperatures in the current section are effective or not, and sending an alarm instruction when the judgment is invalid, and sending one of protection starting prediction information, the alarm instruction and an action instruction according to the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis when the judgment is valid;
step S3, when the alarm instruction is received, giving an alarm; and
and step S4, when the action command is received, the action is carried out to start the protection of the preset protection action device.
In step S1, the infrared sensor in the inspection apparatus of the power plant periodically (e.g., 1 time per second) senses the temperature of the surface of the device to be tested.
In step S2, after the measurement monitor in the inspection apparatus of the power plant station receives the temperature sensed in each period, the received temperature is segmented and detected according to a predetermined time unit (for example, every 1 minute), and if it is detected that all temperatures in the current segment are greater than or equal to the fault temperature threshold (for example, 3000 degrees), an alarm instruction and an action instruction are simultaneously sent.
And if all the temperatures in the current section are detected to be smaller than the fault temperature threshold, determining the positions of all the temperatures in the current section on the two-dimensional coordinate axis, comparing the offset by combining a preset temperature memory curve, and judging whether all the temperatures in the current section are effective or not according to the comparison result. The method comprises the following specific steps:
if the number of the temperatures meeting the first predetermined condition in the current segment is greater than or equal to a predetermined value (for example, 12), all the temperatures in the current segment are judged to be invalid.
If the number of the temperatures meeting the first predetermined condition in the current segment is smaller than a predetermined value (for example, 12), all the temperatures in the current segment are determined to be valid.
In this case, the first predetermined condition is that a positive and negative offset between a position of a certain temperature in the current segment on the two-dimensional coordinate axis and a preset temperature memory curve should exceed a predetermined offset distance value (e.g. 20%).
That is, the number of the temperature (latest measurement point value) in the current segment that deviates from the temperature memory curve by more than 20% is 25% of the total number (60) in the current segment, and the temperature in the current segment is masked and not substituted into the calculation logic. At this time, it is judged that the temperature measurement in the current segment fails, and all protection action logics are locked to make other protection logics unable to act, so as to prevent protection misoperation.
Furthermore, it is also necessary to select one of the protection start prediction information, the alarm instruction and the action instruction to be issued based on the temperature change rate under the condition that all temperatures in the current segment are valid, and the specific process is as follows:
(1) when all the temperatures in the current section are judged to be effective, if the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis is greater than or equal to a first preset slope value (such as 1), an action instruction is sent. Namely, the temperature is determined to increase too fast, the action instruction is output to realize the action of the outlet of the operation box 4, and meanwhile, the alarm instruction can be output to the alarm 3 to give an alarm.
(2) When all the temperatures in the current section are judged to be effective, if the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis is smaller than a first preset slope value (such as 1) and larger than or equal to a second preset slope value (such as 0.5), an alarm instruction is sent. Namely, the temperature is determined to increase rapidly, and an alarm instruction is output to the alarm 3 for alarming.
(3) When all the temperatures in the current segment are judged to be effective, if the slopes formed on the two-dimensional coordinate axes by all the temperatures in the current segment are smaller than a second preset slope value (such as 0.5) and larger than a third preset slope value (such as 0), all the temperatures in the current segment and the slopes formed on the two-dimensional coordinate axes thereof are compared with a preset action temperature threshold value (such as T)set) And (4) combining calculation to obtain the time required by the temperature in the current period reaching the preset action temperature threshold value and sending the time as protection starting prediction information. The temperature change condition can be predicted according to slopes formed by all temperatures in the current segment on a two-dimensional coordinate axis, the time required for rising to the action temperature threshold value can be obtained by combining the temperature change condition, and the time is further used as protection starting prediction information and sent to a preset operation and maintenance personnel monitoring system to form predictive protection.
In step S3, when the alarm instrument in the inspection apparatus of the power plant receives the alarm instruction, an alarm is given; and
in step S4, when the operation box in the power plant inspection device receives the operation command, the operation box operates to start the protection of the preset protection operation device.
The embodiment of the invention has the following beneficial effects:
based on the photo-thermal protection principle, under the limitation of a temperature memory curve (namely, judgment among a slope formed by temperature on a two-dimensional coordinate axis, a first preset slope value, a second preset slope value and a third preset slope value is introduced), protection misoperation is not easy to occur, the protection condition of non-short-circuit overheating faults of power equipment can be compensated, the conditions of oxidation heating of equipment connection points and ageing heating inside the equipment are particularly reliable, meanwhile, fault electrical quantity open logic (namely, judgment of fault temperature threshold values) is introduced for ensuring that the protection reliably acts when the equipment is in a short circuit, the action rejection of other protection cannot be caused, and the action reliability is improved. The intelligent temperature monitoring system has huge application prospects in intelligent and automatic operation and maintenance, can sense and judge the temperature of equipment in real time, and can automatically alarm and protect actions.
It should be noted that, in the above device embodiment, the included device units are only divided according to functional logic, but are not limited to the above division as long as the corresponding functions can be implemented; in addition, the specific names of the functional units are only for the convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It will be understood by those skilled in the art that all or part of the steps in the method for implementing the above embodiments may be implemented by relevant hardware instructed by a program, and the program may be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (6)
1. The power station inspection method is characterized by being used for carrying out real-time temperature detection on equipment to be detected in a power station through a power station inspection device so as to realize alarm and action protection of a preset protection action device, and comprises the following steps:
the power station inspection device periodically senses the temperature of the surface of the equipment to be tested;
after receiving the temperature sensed in each period, carrying out segmentation division and detection on the received temperature according to a preset time unit, and if all the temperatures in the current segment are detected to be greater than or equal to a fault temperature threshold, simultaneously sending an alarm instruction and an action instruction; or if all the temperatures in the current section are detected to be smaller than the fault temperature threshold value, comparing on a two-dimensional coordinate axis by combining a preset temperature memory curve to judge whether all the temperatures in the current section are effective or not, and sending an alarm instruction when the judgment is invalid, and sending one of protection starting prediction information, the alarm instruction and an action instruction according to the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis when the judgment is valid;
when the alarm instruction is received, alarming; and
when the action instruction is received, acting to start the protection of the preset protection action device;
when the power station inspection device is effective in judgment, the specific steps of sending one of protection starting prediction information, an alarm instruction and an action instruction according to the slope formed on the two-dimensional coordinate axis by all the temperatures in the current section comprise:
when all the temperatures in the current section are judged to be effective, if the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis is greater than or equal to a first preset slope value, the action instruction is sent; if the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis is smaller than the first preset slope value and larger than or equal to a second preset slope value, the alarm instruction is sent out; if the slopes of all the temperatures in the current segment formed on the two-dimensional coordinate axis are smaller than the second preset slope value and larger than the third preset slope value, calculating all the temperatures in the current segment and the slopes of all the temperatures in the current segment formed on the two-dimensional coordinate axis in combination with a preset action temperature threshold value to obtain the time required by the temperatures in the current segment reaching the preset action temperature threshold value, and sending the time as protection starting prediction information.
2. The power plant inspection method according to claim 1, wherein the specific step of comparing the power plant inspection device with a preset temperature memory curve on a two-dimensional coordinate axis to determine whether all the temperatures in the current section are valid or not, if the power plant inspection device detects that all the temperatures in the current section are less than the fault temperature threshold, comprises:
when all temperatures in the current section are smaller than the fault temperature threshold value, determining the positions of all temperatures in the current section on the two-dimensional coordinate axis, comparing the offset by combining the preset temperature memory curve, and if the number of the temperatures in the current section which meet the first preset condition is greater than or equal to a preset value, judging that all the temperatures in the current section are invalid; or if the number of the temperatures meeting the first preset condition in the current section is smaller than the preset value, judging that all the temperatures in the current section are effective; the first preset condition is that a positive and negative offset formed by a position of a certain temperature on the two-dimensional coordinate axis in the current section and the preset temperature memory curve exceeds a preset offset distance value.
3. The power plant inspection method according to claim 1, wherein the method further comprises:
and the power plant inspection device sends the protection action starting prediction information to a preset operation and maintenance personnel monitoring system.
4. The power plant inspection method according to claim 3, wherein the first preset slope value is 1; the second preset slope value is 0.5; the third preset slope value is 0.
5. An inspection device for an electric power plant station is characterized by comprising an infrared sensor, a measurement monitor, an alarm instrument and an operation box; wherein the content of the first and second substances,
the infrared sensor is connected with the measuring monitor and is used for periodically sensing the temperature of the surface of the equipment to be measured;
the measurement monitor is used for segmenting and detecting the received temperature according to a preset time unit after receiving the temperature sensed in each period, and simultaneously sending an alarm instruction and an action instruction if all the temperatures in the current segment are detected to be greater than or equal to a fault temperature threshold value; or if all the temperatures in the current section are detected to be smaller than the fault temperature threshold value, comparing on a two-dimensional coordinate axis by combining a preset temperature memory curve to judge whether all the temperatures in the current section are effective or not, and sending an alarm instruction when the judgment is invalid, and sending one of protection starting prediction information, the alarm instruction and an action instruction according to the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis when the judgment is valid;
the alarm instrument is connected with the measurement monitor and is used for giving an alarm when receiving the alarm instruction;
the operation box is respectively connected with the measurement monitor and a preset protection action device and is used for acting to start the protection of the preset protection action device when receiving the action command;
the measurement monitor includes a second measurement judgment unit, the second measurement judgment unit includes:
the effective temperature judging module is used for determining the positions of all the temperatures in the current section on the two-dimensional coordinate axis when all the temperatures in the current section are smaller than the fault temperature threshold, carrying out offset comparison by combining the preset temperature memory curve, and judging that all the temperatures in the current section are invalid if the number of the temperatures in the current section which meet the first preset condition is greater than or equal to a preset value; or if the number of the temperatures meeting the first preset condition in the current section is smaller than the preset value, judging that all the temperatures in the current section are effective; the first preset condition is that a positive and negative offset formed by a position of a certain temperature on the two-dimensional coordinate axis in the current section and the preset temperature memory curve exceeds a preset offset distance value;
the first temperature change rate judging module is used for sending the action instruction if the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis is greater than or equal to a first preset slope value when all the temperatures in the current section are judged to be effective;
the second temperature change rate judging module is used for sending the alarm instruction if the slope formed by all the temperatures in the current section on the two-dimensional coordinate axis is smaller than the first preset slope value and larger than or equal to a second preset slope value when all the temperatures in the current section are judged to be effective;
and the third temperature change rate judgment module is used for calculating all the temperatures in the current section and the slopes formed on the two-dimensional coordinate axis of the temperatures in the current section in combination with a preset action temperature threshold value if all the temperatures in the current section are judged to be effective and the slopes formed on the two-dimensional coordinate axis of the temperatures in the current section are smaller than the second preset slope value and larger than a third preset slope value, so that the time required when the temperatures in the current section reach the preset action temperature threshold value is obtained and sent as protection starting prediction information.
6. The power plant station inspection device according to claim 5, wherein the measurement monitor further includes:
the receiving unit is used for receiving the temperature sensed in each period;
the segmentation and detection unit is used for segmenting and detecting the received temperature according to a preset time unit;
and the first measurement judging unit is used for simultaneously sending an alarm instruction and an action instruction if all the temperatures in the current section are detected to be more than or equal to the fault temperature threshold.
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