CN112834860A - Method for sensing equipment fault by detecting current change - Google Patents
Method for sensing equipment fault by detecting current change Download PDFInfo
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- CN112834860A CN112834860A CN202110282581.2A CN202110282581A CN112834860A CN 112834860 A CN112834860 A CN 112834860A CN 202110282581 A CN202110282581 A CN 202110282581A CN 112834860 A CN112834860 A CN 112834860A
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- 238000005259 measurement Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims abstract description 4
- 238000004458 analytical method Methods 0.000 claims description 16
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- 210000000697 sensory organ Anatomy 0.000 claims description 3
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a method for sensing equipment fault by detecting current change, belonging to the technical field of electric appliance maintenance, which carries out current detection on current: detecting the current by using the test pencil to check whether the current output is too large or too small; finding out the current fault position and marking; disconnecting the power switch; the most effective method for finding out the specific measurement current change is as follows: a thermoelectric method; bolometer method. The invention combines the thermoelectric method and the bolometer method by delicate design, conveniently solves the problem of inaccurate phase flow change asymmetric detection of the current fault of the equipment, detects the phase flow change asymmetry of the current fault of the equipment by combining the current detection methods based on the thermoelectric method and the bolometer method, and determines the current instability so as to detect the minimum current change, thereby detecting the minimum impedance change and accurately sensing whether the capacitor has fault.
Description
Technical Field
The invention relates to a method for sensing equipment faults, relates to the technical field of electric appliance maintenance, and particularly relates to a method for sensing equipment faults by detecting current changes.
Background
With the development of science and technology, in order to ensure the safe and reliable operation of the system and reduce the influence caused by short circuit, the electrical equipment should try to eliminate all the causes which may cause short circuit in operation and maintenance, and also should cut off the short circuit fault part as soon as possible to recover the system voltage to the normal value in a short time. For this purpose, fast acting relay protection and circuit breakers can be used, and generators equipped with automatically regulated excitation devices, etc.
The following problems exist in the prior art:
1. in the prior art, the method for sensing the equipment fault has the problem that the detection of the phase flow change asymmetry of the current fault of the equipment is inaccurate;
2. in the prior art, for some methods for sensing equipment faults, the accuracy of detecting the equipment current faults is not high enough, whether capacitor equipment has faults or not can not be monitored in time, and further the original use purpose of the method for sensing the equipment faults cannot be achieved, the applicability of the method for sensing the equipment faults is poor, and therefore structural innovation is needed to be carried out to solve the specific problems.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for sensing equipment fault by detecting current change, wherein one purpose is to provide a thermoelectric method and a bolometer method, and solve the problem of inaccurate detection of phase flow change asymmetry of the equipment current fault; the other purpose is to solve the problem that the detection accuracy of the current fault of the equipment is not high enough and whether the capacitor equipment fails or not can not be monitored in time, so that the equipment is not affected by the unbalance of the input voltage of the current in the use process, the detection accuracy of the current fault of the equipment is high, whether the capacitor equipment fails or not can be monitored in time, the reliability of fault early warning is improved, and the occurrence of serious faults of electronic equipment can be effectively prevented.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a method for sensing a device fault by detecting a change in current, comprising the steps of,
the method comprises the following steps: firstly, current detection is carried out on the current;
step two: finding out the most effective method for measuring the current change;
step three: repairing the current fault;
step four: further checking the position of the repair treatment;
step five: ensuring the current of the equipment to normally operate.
The technical scheme of the invention is further improved as follows: current detection is carried out on the current in the first step:
a 1: detecting the current by using the test pencil to check whether the current output is too large or too small;
a 2: finding out the current fault position and marking;
a 3: the power switch is turned off.
The technical scheme of the invention is further improved as follows: the method for finding out the most effective specific measurement current change in the second step comprises the following steps: a thermoelectric method; bolometer method.
The technical scheme of the invention is further improved as follows: and in the third step, the current fault is repaired, and the repairing method comprises the following steps: general programming method, power grid division method, circuit analysis method, instrument measurement method and power failure reset method.
The technical scheme of the invention is further improved as follows: the position of the repairing treatment is further checked in the fourth step; the current detection method based on the thermoelectric method and the bolometer method is combined, the current fault of the equipment is detected in a way that the phase flow change is asymmetric, and the current instability is determined.
The technical scheme of the invention is further improved as follows: and fifthly, normal operation of the current of the equipment is ensured, the reliability of fault early warning is improved, and the serious fault of the electronic equipment is effectively prevented.
The technical scheme of the invention is further improved as follows: the current detection method comprises the following steps: thermoelectric methods, bolometer methods;
a thermoelectric method: the method can be used for measuring direct current, low frequency and high frequency current. When measuring alternating current, sending a measured current signal from the left end, and recording an indicator value; then, the direct current is input to obtain the direct current value which is equal to the measured alternating current value when the same indicating value is obtained. This dc current must be calibrated to ensure high accuracy. The core of the thermoelectric method circuit is a thermocouple, in order to eliminate the forward and reverse errors of the thermocouple, the wiring directions of two ends of the thermocouple are required to be changed when the direct current is measured, and then the average value of the two times is taken. The method has wide range of about 10 < -3 > to 102 amperes; the accuracy is high and can reach +/-10-5, and the method is the most used method;
bolometer method: by using the characteristic that the resistance value of the radiant heater is only related to the applied power and not related to the frequency, a high-frequency voltage is measured by using a direct current instead of a high-frequency current by using a radiant heater bridge circuit, and then the current is obtained by using the voltage and the resistance. To reduce the standing wave effect, the resistance of the bolometer should be made as equal as possible to the characteristic impedance of the transmission line. The output port is typically connected to a resonant tank or 1/4 wavelength short to reduce shunt effects. The method has the precision of +/-10-2 to 10-3 and the use frequency of several gigahertz.
The technical scheme of the invention is further improved as follows: the repairing method comprises the following steps: a general program method, a power grid division method, a circuit analysis method, an instrument measurement method and a power failure reset method;
general procedure: (1) according to the computer monitoring alarm and briefing information login, the measuring instrument indication, the relay protection action condition and the field inspection condition, judging the accident property and the fault range and determining a correct processing program;
(2) when an accident or a fault seriously threatens the human body and equipment, the related power supply of the equipment is quickly cut off; when a fire accident occurs, the fire fighters are informed and necessary field matching is carried out;
(3) and a fault point is quickly cut off, and the relay protection is manually executed when the relay protection does not act correctly. In order to accelerate the accident or fault processing process and prevent the accident from expanding, the fault equipment isolation operation which has no great influence on the system operation can be automatically processed according to the field accident processing rule;
a grid splitting method: the method is a method commonly used by operators for searching the faults of electrical equipment. For example, a power grid division method is commonly used for searching faults such as single-phase earth faults and direct-current one-point earth faults of a generator voltage system and a 10kV voltage system, loss of voltage of service power and a unit power panel and the like. Usually, a 'route pulling method' of pulling the feeder lines one by one is adopted, when a certain feeder line is pulled, a ground fault signal disappears, and a ground point is in the feeder line;
circuit analysis method: the method is a method for preliminarily diagnosing the fault property of the equipment, analyzing the fault reason of the equipment and determining the fault range of the equipment according to the working principle, the control principle and the control loop of the electrical equipment and by combining with a sense organ. When in analysis, the main circuit is started, and then each control loop and the auxiliary loop thereof are analyzed in sequence. The common circuit analysis method is used by operators to search for more complicated faults such as unsuccessful excitation starting of the excitation system;
measuring a meter: the method comprises the steps of utilizing instrument equipment to check electrical equipment, measuring the magnitude of certain electrical parameters according to an instrument, comparing the magnitude with a normal value, and determining the fault reason and the fault position. The measuring instruments commonly used by operators are multimeters and megameters. Multimeters are commonly used to measure ac and dc voltages, ac and dc currents and resistance;
a power-off reset method: the automatic device is an integral body composed of various electronic components, and the device is electrified for a long time to operate, so that the components are unstable in operation and are easily affected by factors such as electrical interference, thermal stability and the like to cause various accidental faults.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the technical progress that:
1. the invention provides a method for sensing equipment faults by detecting current changes, which is ingenious in design, adopts a thermoelectric method and a bolometer method to be combined, is convenient to solve the problem of inaccurate phase flow change asymmetric detection of the current faults of equipment, and is used for detecting the phase flow change asymmetry of the current faults of the equipment and determining current instability by combining a current detection method based on the thermoelectric method and the bolometer method so as to detect minimum current changes, so that the minimum impedance changes can be detected, and whether the faults of a capacitor occur or not can be accurately sensed.
1. The invention provides a method for sensing equipment faults by detecting current changes, which can solve the problems that the equipment current fault detection accuracy is not high enough and whether capacitor equipment fails or not can not be timely monitored by adopting a general program method, a power grid segmentation method, a circuit analysis method, an instrument measurement method and a power failure reset method which are combined, so that the equipment is not influenced by unbalanced input voltage of current in the use process, the equipment current fault detection accuracy is higher, whether the capacitor equipment fails or not can be timely monitored, the reliability of fault early warning is improved, and the occurrence of serious faults of electronic equipment can be effectively prevented.
Drawings
FIG. 1 is a schematic view of a step flow structure of the present invention;
FIG. 2 is a schematic structural diagram of a current detection step according to the present invention;
FIG. 3 is a schematic structural diagram of a measurement method according to the present invention;
FIG. 4 is a schematic structural diagram of a maintenance method according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples: comprises the following steps of (a) carrying out,
the method comprises the following steps: current detection is carried out on the current:
a 1: detecting the current by using the test pencil to check whether the current output is too large or too small;
a 2: finding out the current fault position and marking;
a 3: the power switch is turned off.
Step two: the most effective method for finding out the specific measurement current change is as follows: a thermoelectric method; bolometer methods; a thermoelectric method: the method can be used for measuring direct current, low frequency and high frequency current. When measuring alternating current, sending a measured current signal from the left end, and recording an indicator value; then, the direct current is input to obtain the direct current value which is equal to the measured alternating current value when the same indicating value is obtained. This dc current must be calibrated to ensure high accuracy. The core of the thermoelectric method circuit is a thermocouple, in order to eliminate the forward and reverse errors of the thermocouple, the wiring directions of two ends of the thermocouple are required to be changed when the direct current is measured, and then the average value of the two times is taken. The method has wide range of about 10 < -3 > to 102 amperes; the accuracy is high and can reach +/-10-5, and the method is the most used method;
bolometer method: by using the characteristic that the resistance value of the radiant heater is only related to the applied power and not related to the frequency, a high-frequency voltage is measured by using a direct current instead of a high-frequency current by using a radiant heater bridge circuit, and then the current is obtained by using the voltage and the resistance. To reduce the standing wave effect, the resistance of the bolometer should be made as equal as possible to the characteristic impedance of the transmission line. The output port is typically connected to a resonant tank or 1/4 wavelength short to reduce shunt effects. The method has the precision of +/-10-2 to 10-3 and the use frequency of several gigahertz.
Step three: the current fault is repaired, and the repairing method comprises the following steps: a general program method, a power grid division method, a circuit analysis method, an instrument measurement method and a power failure reset method;
general procedure: (1) according to the computer monitoring alarm and briefing information login, the measuring instrument indication, the relay protection action condition and the field inspection condition, judging the accident property and the fault range and determining a correct processing program;
(2) when an accident or a fault seriously threatens the human body and equipment, the related power supply of the equipment is quickly cut off; when a fire accident occurs, the fire fighters are informed and necessary field matching is carried out;
(3) and a fault point is quickly cut off, and the relay protection is manually executed when the relay protection does not act correctly. In order to accelerate the accident or fault processing process and prevent the accident from expanding, the fault equipment isolation operation which has no great influence on the system operation can be automatically processed according to the field accident processing rule;
a grid splitting method: the method is a method commonly used by operators for searching the faults of electrical equipment. For example, a power grid division method is commonly used for searching faults such as single-phase earth faults and direct-current one-point earth faults of a generator voltage system and a 10kV voltage system, loss of voltage of service power and a unit power panel and the like. Usually, a 'route pulling method' of pulling the feeder lines one by one is adopted, when a certain feeder line is pulled, a ground fault signal disappears, and a ground point is in the feeder line;
circuit analysis method: the method is a method for preliminarily diagnosing the fault property of the equipment, analyzing the fault reason of the equipment and determining the fault range of the equipment according to the working principle, the control principle and the control loop of the electrical equipment and by combining with a sense organ. When in analysis, the main circuit is started, and then each control loop and the auxiliary loop thereof are analyzed in sequence. The common circuit analysis method is used by operators to search for more complicated faults such as unsuccessful excitation starting of the excitation system;
measuring a meter: the method comprises the steps of utilizing instrument equipment to check electrical equipment, measuring the magnitude of certain electrical parameters according to an instrument, comparing the magnitude with a normal value, and determining the fault reason and the fault position. The measuring instruments commonly used by operators are multimeters and megameters. Multimeters are commonly used to measure ac and dc voltages, ac and dc currents and resistance;
a power-off reset method: the automatic device is an integral body consisting of various electronic components, and the device is electrified for a long time to operate, so that components are unstable in operation and are easily affected by factors such as electrical interference, thermal stability and the like to cause various accidental faults;
the non-stick bag process of the glue product has the advantages that the problem that the detection of phase flow change asymmetry of current faults of equipment is inaccurate is conveniently solved by combining a thermoelectric method and a bolometer method through delicate design, the detection of the phase flow change asymmetry of the current faults of the equipment is carried out by combining the current detection methods based on the thermoelectric method and the bolometer method, the current instability of the equipment is determined, so that the minimum current change is detected, the minimum impedance change can be detected, whether the fault of a capacitor occurs or not can be accurately sensed, and the problems that the detection accuracy of the current faults of the equipment is not high enough, and whether the fault of the capacitor equipment occurs or not can not be timely monitored can be solved by combining a common program method, a circuit analysis method, an instrument measurement method and a power-off reset method, the method has the advantages that the equipment is not affected by unbalanced input voltage of current in the using process, the current fault detection accuracy of the equipment is high, whether capacitor equipment breaks down or not can be monitored in time, the reliability of fault early warning is improved, and the method is favorable for effectively preventing serious faults of electronic equipment.
The present invention has been described in general terms in the foregoing, but it will be apparent to those skilled in the art that modifications and improvements can be made thereto based on the present invention. Therefore, modifications or improvements are within the scope of the invention without departing from the spirit of the inventive concept.
Claims (8)
1. A method of sensing a device fault by detecting a change in current, comprising: comprises the following steps of (a) carrying out,
the method comprises the following steps: firstly, current detection is carried out on the current;
step two: finding out the most effective method for measuring the current change;
step three: repairing the current fault;
step four: further checking the position of the repair treatment;
step five: ensuring the current of the equipment to normally operate.
2. A method of sensing a device fault by detecting a change in current according to claim 1, wherein: current detection is carried out on the current in the first step:
a 1: detecting the current by using the test pencil to check whether the current output is too large or too small;
a 2: finding out the current fault position and marking;
a 3: the power switch is turned off.
3. A method of sensing a device fault by detecting a change in current according to claim 1, wherein: the method for finding out the most effective specific measurement current change in the second step comprises the following steps: a thermoelectric method; bolometer method.
4. A method of sensing a device fault by detecting a change in current according to claim 1, wherein: and in the third step, the current fault is repaired, and the repairing method comprises the following steps: general programming method, power grid division method, circuit analysis method, instrument measurement method and power failure reset method.
5. A method of sensing a device fault by detecting a change in current according to claim 1, wherein: the position of the repairing treatment is further checked in the fourth step; the current detection method based on the thermoelectric method and the bolometer method is combined, the current fault of the equipment is detected in a way that the phase flow change is asymmetric, and the current instability is determined.
6. A method of sensing a device fault by detecting a change in current according to claim 1, wherein: and fifthly, normal operation of the current of the equipment is ensured, the reliability of fault early warning is improved, and the serious fault of the electronic equipment is effectively prevented.
7. A method of sensing a device fault by detecting a change in current according to claim 1, wherein: the current detection method comprises the following steps: thermoelectric methods, bolometer methods;
a thermoelectric method: the method can be used for measuring direct current, low frequency and high frequency current. When measuring alternating current, sending a measured current signal from the left end, and recording an indicator value; then, the direct current is input to obtain the direct current value which is equal to the measured alternating current value when the same indicating value is obtained. This dc current must be calibrated to ensure high accuracy. The core of the thermoelectric method circuit is a thermocouple, in order to eliminate the forward and reverse errors of the thermocouple, the wiring directions of two ends of the thermocouple are required to be changed when the direct current is measured, and then the average value of the two times is taken. The method has wide range of about 10 < -3 > to 102 amperes; the accuracy is high and can reach +/-10-5, and the method is the most used method;
bolometer method: by using the characteristic that the resistance value of the radiant heater is only related to the applied power and not related to the frequency, a high-frequency voltage is measured by using a direct current instead of a high-frequency current by using a radiant heater bridge circuit, and then the current is obtained by using the voltage and the resistance. To reduce the standing wave effect, the resistance of the bolometer should be made as equal as possible to the characteristic impedance of the transmission line. The output port is typically connected to a resonant tank or 1/4 wavelength short to reduce shunt effects. The method has the precision of +/-10-2 to 10-3 and the use frequency of several gigahertz.
8. A method of sensing a device fault by detecting a change in current according to claim 1, wherein: the repairing method comprises the following steps: a general program method, a power grid division method, a circuit analysis method, an instrument measurement method and a power failure reset method;
general procedure: (1) according to the computer monitoring alarm and briefing information login, the measuring instrument indication, the relay protection action condition and the field inspection condition, judging the accident property and the fault range and determining a correct processing program;
(2) when an accident or a fault seriously threatens the human body and equipment, the related power supply of the equipment is quickly cut off; when a fire accident occurs, the fire fighters are informed and necessary field matching is carried out;
(3) and a fault point is quickly cut off, and the relay protection is manually executed when the relay protection does not act correctly. In order to accelerate the accident or fault processing process and prevent the accident from expanding, the fault equipment isolation operation which has no great influence on the system operation can be automatically processed according to the field accident processing rule;
a grid splitting method: the method is a method commonly used by operators for searching the faults of electrical equipment. For example, a power grid division method is commonly used for searching faults such as single-phase earth faults and direct-current one-point earth faults of a generator voltage system and a 10kV voltage system, loss of voltage of service power and a unit power panel and the like. Usually, a 'route pulling method' of pulling the feeder lines one by one is adopted, when a certain feeder line is pulled, a ground fault signal disappears, and a ground point is in the feeder line;
circuit analysis method: the method is a method for preliminarily diagnosing the fault property of the equipment, analyzing the fault reason of the equipment and determining the fault range of the equipment according to the working principle, the control principle and the control loop of the electrical equipment and by combining with a sense organ. When in analysis, the main circuit is started, and then each control loop and the auxiliary loop thereof are analyzed in sequence. The common circuit analysis method is used by operators to search for more complicated faults such as unsuccessful excitation starting of the excitation system;
measuring a meter: the method comprises the steps of utilizing instrument equipment to check electrical equipment, measuring the magnitude of certain electrical parameters according to an instrument, comparing the magnitude with a normal value, and determining the fault reason and the fault position. The measuring instruments commonly used by operators are multimeters and megameters. Multimeters are commonly used to measure ac and dc voltages, ac and dc currents and resistance;
a power-off reset method: the automatic device is an integral body composed of various electronic components, and the device is electrified for a long time to operate, so that the components are unstable in operation and are easily affected by factors such as electrical interference, thermal stability and the like to cause various accidental faults.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113708647A (en) * | 2021-08-30 | 2021-11-26 | 西安铁路职业技术学院 | Frequency conversion-power frequency combined driving system for large and medium-sized equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113708647A (en) * | 2021-08-30 | 2021-11-26 | 西安铁路职业技术学院 | Frequency conversion-power frequency combined driving system for large and medium-sized equipment |
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