CN114152848A - Fault detection method and equipment for gas insulated totally-enclosed combined electrical apparatus - Google Patents
Fault detection method and equipment for gas insulated totally-enclosed combined electrical apparatus Download PDFInfo
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Abstract
The invention provides a fault detection method for a gas insulated totally-enclosed combined electrical apparatus, which comprises the following steps: arranging the sensing optical fiber outside the shell along the length direction of the shell of the gas insulated totally-enclosed combined electrical appliance; the gas insulated totally-enclosed combined electrical apparatus is divided into a plurality of sections according to a certain distance, and a vibration signal in each section of the gas insulated totally-enclosed combined electrical apparatus is simultaneously monitored by using a sensing optical fiber, so that whether a fault exists in the section of the gas insulated totally-enclosed combined electrical apparatus or not and the section with the fault exists in the section of the gas insulated totally-enclosed combined electrical apparatus are judged. According to the fault detection method and equipment for the gas insulated fully-enclosed combined electrical appliance, provided by the invention, only one optical cable needs to be wound outside a GIS enclosed metal shell, no electronic device is needed in a field, the problem of data transmission does not exist, the method and equipment have the advantages of no electromagnetic interference influence, no transmission signal limitation, convenience and intuition in real-time observation outside the field and the like, and great reliability and convenience are brought to quick and effective positioning of GIS equipment with breakdown faults.
Description
Technical Field
The invention belongs to the technical field of equipment detection, and particularly relates to a fault detection method and equipment for a gas insulated fully-closed combined electrical appliance.
Background
GIS (gas Insulated switchgear) is a short English name for gas Insulated fully enclosed switchgear. The GIS is composed of all devices except a transformer in a transformer substation, including a circuit breaker, a disconnecting switch, a grounding switch, a voltage transformer, a current transformer, a lightning arrester, a bus, a cable terminal, an inlet and outlet bushing and the like, wherein the devices or parts are all sealed in a metal grounded shell, and SF6 insulating gas with certain pressure is filled in the metal grounded shell, so the GIS is also called as an SF6 totally-enclosed combined electrical appliance. The GIS system has the advantages of compact structure, small occupied area, high reliability, flexible configuration, convenience in installation, high safety and strong environment adaptability, and is widely applied to the fields of high voltage, ultrahigh voltage and extra-high voltage.
According to the requirements of the field voltage withstand and insulation test guide of gas insulated metal enclosed switchgear (DL/T555-2004), the GIS new installation part, the extension part and the disassembly maintenance part are required to be subjected to insulation voltage withstand tests. Because the GIS equipment is completely enclosed in the metal-grounded shell, once equipment or component failure occurs during the insulation withstand voltage test, how to quickly and effectively locate the failed equipment is a problem to be solved. However, in the process of performing an insulation withstand voltage test on a GIS system, all GIS devices are enclosed in a metal-grounded shell, and in addition, the field is in a high-voltage state, and various electromagnetic environments are complex, so that a common electronic sensor system is easily interfered, is unstable in work, and is difficult to monitor in real time outside the field.
Meanwhile, in the daily operation and maintenance process of the GIS system, all GIS equipment is sealed in a metal grounded shell, once breakdown fault occurs to certain equipment, the outside can feel huge sound and vibration, and other effective information is difficult to obtain. In the daily operation process, once equipment or part faults occur, how to quickly and effectively locate the equipment with the faults is an urgent problem to be solved. In addition, if a certain means can predict and give an early warning before the GIS equipment finally breaks down, great significance and influence can be brought to GIS system maintenance work, and passive waiting equipment faults in GIS system maintenance engineering can be changed into active discovery and timely scheduling, so that power utilization risks are avoided.
Therefore, the method has great economic and social benefits no matter how to quickly and effectively position the equipment with breakdown faults after the breakdown faults of the GIS equipment occur in the insulation and voltage resistance test before the power supply of the GIS system or in the daily operation process. However, due to the high voltage state on site and the complex electromagnetic environment, various electronic instruments for monitoring sound and vibration by adopting the conventional monitoring means usually have various problems and have unsatisfactory use effect.
Disclosure of Invention
The technical problem is as follows: the invention provides a fault detection method and equipment for a gas insulated fully-closed combined electrical appliance, aiming at solving the problem of quickly and effectively positioning equipment with breakdown faults after the breakdown faults of GIS equipment occur in the processes of insulation and voltage withstand test before power supply and daily operation.
The technical scheme is as follows: the invention provides a fault detection method for a gas insulated totally-enclosed combined electrical apparatus, which comprises the following steps:
(1) arranging the sensing optical fiber outside the shell along the length direction of the shell of the gas insulated totally-enclosed combined electrical appliance;
(2) the gas insulated totally-enclosed combined electrical apparatus is divided into a plurality of sections according to a certain distance, and a vibration signal in each section of the gas insulated totally-enclosed combined electrical apparatus is simultaneously monitored by using a sensing optical fiber, so that whether a fault exists in the section of the gas insulated totally-enclosed combined electrical apparatus or not and the section with the fault exists in the section of the gas insulated totally-enclosed combined electrical apparatus are judged.
Preferably, the method for monitoring the vibration signal inside the segment of the gas insulated fully-closed combined electrical appliance by using the sensing optical fiber comprises the following steps:
(2.1) sending two laser pulses I and II with different frequencies and a fixed time interval to a sensing optical fiber by using a laser, wherein the angular frequencies of the laser pulses I and II with different frequencies are different by omega; receiving two beams of reverse Rayleigh scattering signals I and II formed by two laser pulses A and B with different frequencies in a sensing optical fiber, and delaying the scattering signal I to enable the scattering signal I and the scattering signal II to be positioned at the same position to form interference;
(2.2) detecting phase change signals of the optical fiber caused by external physical reasons
The method is used as a basis for judging whether a fault exists in the section of the gas insulated totally-enclosed combined electrical apparatus or not and judging whether the fault exists in the section of the gas insulated totally-enclosed combined electrical apparatus: solvable using the following formula
Wherein the content of the first and second substances,
Vithe interference signal is filtered to remove a direct current term, then is mixed with a reference signal cos (ω t), and then is subjected to low-pass filtering to obtain a signal;
Vqthe interference signal is obtained by low-pass filtering after filtering a direct current term and mixing with a reference signal sin (ω t);
a is the amplitude of the light intensity of the laser pulses I and II, and is related to the input light intensity, the splitting ratio of the coupler and the polarization state of the two beams of light.
Preferably, the method for determining whether a fault exists in the section of the gas insulated fully-closed combined electrical appliance and the section with the fault exists comprises the following steps: in a two-dimensional coordinate system, length segments are taken as an X axis, monitoring time is taken as a Y axis, abnormal signals in a phase change signal psi are represented in the coordinate system, the degree of deviation from normal signals is represented by different colors, whether faults exist or not is judged according to the abnormal signals in the coordinate system, the fault position is judged according to an abscissa, the fault time is judged according to an ordinate, and the severity and possible causes of the faults are judged according to the colors.
Preferably, the method for determining whether a fault exists in the section of the gas insulated fully-closed combined electrical appliance and the section with the fault exists comprises the following steps: identifying real-time domain data of each channel (a group of data of the same abscissa at different time is a channel) as events of different classifications by adopting a machine learning algorithm, and obtaining equipment in a GIS (geographic information System) and alarm information related to the position by combining the corresponding relation of the position and the equipment; and adopting different alarm strategies according to the emergency degree of each alarm message.
Has the advantages that: according to the fault detection method and equipment for the gas insulated fully-enclosed combined electrical appliance, provided by the invention, only one optical cable needs to be wound outside a GIS enclosed metal shell, no electronic device is needed in a field, the problem of data transmission does not exist, the method and equipment have the advantages of no electromagnetic interference influence, no transmission signal limitation, convenience and intuition in real-time observation outside the field and the like, and great reliability and convenience are brought to quick and effective positioning of GIS equipment with breakdown faults.
Through actual tests and experiments of a plurality of transformer substations, the method can intuitively monitor vibration signals of different positions of the metal shell of the GIS system in real time in the GIS voltage insulation and withstand test. In the process of the insulation voltage withstand test, once breakdown occurs, the equipment with the fault can be quickly and effectively positioned on the real-time domain signal or on the classification event after the machine learning algorithm SVM is adopted for processing, and the field fault removal and maintenance processing are greatly facilitated. Meanwhile, in order to achieve the best effect, the sensing optical cable needs to be tightly coupled with the metal shell, otherwise, false signals and noise are easily brought, and interference is brought to a given position.
In the daily operation and maintenance process of the GIS system, the method provided by the invention can be used for continuously monitoring the vibration of each position of the GIS closed metal shell, and can be used for timely finding out any abnormal vibration information. Once breakdown failure occurs to the GIS device, extremely violent vibration information is inherently caused. From normal operation to breakdown of a GIS device, the GIS device usually fails not instantaneously but in a time accumulation process. According to the daily monitoring of the method, the machine learning algorithm SVM is utilized, slight abnormal information before breakdown fault of the GIS equipment is picked up from the monitored big data, the rule is summarized, the prediction rule of the GIS equipment fault can be gradually formed, active, purposeful and targeted maintenance of the GIS equipment is realized, passive is changed into active, and the safety and stability of power supply of the transformer substation are improved.
Drawings
Fig. 1 is a schematic structural diagram of a fault detection device of a gas insulated fully-closed combined electrical appliance.
Fig. 2 is a schematic view of the optical cable of embodiment 1 laid along the GIS metal housing (red tape-bonded coupling).
Fig. 3 is a real-time waterfall chart monitored by the method of embodiment 1.
FIG. 4 is a time domain diagram of real-time monitoring of different channels according to the method of embodiment 1.
Fig. 5 is a schematic diagram of a method for monitoring the waterfall in real time in an abnormal situation according to embodiment 1.
Fig. 6 is a schematic view of the optical cable of embodiment 2 laid along the GIS metal housing (red tape-bonded coupling).
Fig. 7 is a schematic diagram of a method of embodiment 2 for real-time monitoring of waterfall.
FIG. 8 is a GIS metal case real-time vibration event classification schematic diagram of embodiment 2
Detailed Description
The present invention is further explained below.
The fault detection equipment for the gas insulated totally-enclosed combined electrical apparatus comprises a sensing optical fiber (1) outside a shell of the gas insulated totally-enclosed combined electrical apparatus, a laser (2), an AOM acousto-optic modulator (3), an EDFA amplifier (4), a circulator (5), a coupler (6), a photoelectric converter (7), an ADC (analog-to-digital converter) (8) and a data processing module (9) which are connected in sequence; the laser (2) is used for emitting laser to the AOM acousto-optic modulator (3), the AOM acousto-optic modulator (3) is used for modulating the laser and forming two laser pulses with two different frequencies and a fixed time interval, and the EDFA amplifier (4) is used for amplifying the two laser pulses with two different frequencies and a fixed time interval and inputting the two laser pulses to the sensing optical fiber (1); the coupler (6) is used for receiving two bundles of reverse Rayleigh scattering signals formed in the sensing optical fiber (1) and coupling the two bundles of reverse Rayleigh scattering signals to generate an interference effect, the photoelectric converter (7) is used for converting the interfered reverse Rayleigh scattering signals into electric signals, the ADC (analog-to-digital converter) (8) is used for converting the electric signals into digital signals, and the data processing module (9) is used for processing the digital signals and monitoring whether faults occur.
The part types and sources used in the apparatus are:
sensing optical fiber (1)
The model is as follows: TotalPlay-G.657B3
The supplier: nanjing Huaxin Tencang optical communication Co Ltd
Laser (2)
The model is as follows: 800834
The supplier: RIO Laser
AOM acousto-optic modulator (3)
The model is as follows: 30196701
The supplier: gooch & Housego Ltd
EDFA amplifier (4)
The model is as follows: JAOC-EDFA-FG-15C21
The supplier: AOC Technologies, Inc.
Circulator (5)
The model is as follows: CIR-P110L11
The supplier: shandong Rui opto-electronic technology Co Ltd
Coupler (6)
The model is as follows: WBC-1550nm-1 x 2-3 x 54-0.9
The supplier: shandong Rui opto-electronic technology Co Ltd
Photoelectric converter (7)
The model is as follows: LDPF 0120
The supplier: OSI LaserDiode, Inc.
ADC analog-to-digital converter (8)
The model is as follows: AD9253
The supplier: analog devices, Inc.
Data processing module (9)
The model is as follows: TMS320C6678
The supplier: texas instruments TI
By utilizing the equipment, the fault detection of the gas insulated totally-enclosed combined electrical apparatus comprises the following steps:
(1) arranging the sensing optical fiber outside the shell along the length direction of the shell of the gas insulated totally-enclosed combined electrical appliance;
(2) the gas insulated totally-enclosed combined electrical apparatus is divided into a plurality of sections according to a certain distance, and a vibration signal in each section of the gas insulated totally-enclosed combined electrical apparatus is simultaneously monitored by using a sensing optical fiber, so that whether a fault exists in the section of the gas insulated totally-enclosed combined electrical apparatus or not and the section with the fault exists in the section of the gas insulated totally-enclosed combined electrical apparatus are judged.
The method for monitoring the vibration signal inside the section of the gas insulated fully-closed combined electrical appliance by using the sensing optical fiber comprises the following steps:
(2.1) sending two laser pulses I and II with different frequencies and a fixed time interval to a sensing optical fiber by using a laser, wherein the angular frequencies of the laser pulses I and II with different frequencies are different by omega; receiving two beams of reverse Rayleigh scattering signals I and II formed by two laser pulses A and B with different frequencies in a sensing optical fiber, and delaying the scattering signal I to enable the scattering signal I and the scattering signal II to be positioned at the same position to form interference;
(2.2) detecting phase change signals of the optical fiber caused by external physical reasons
The method is used as a basis for judging whether a fault exists in the section of the gas insulated totally-enclosed combined electrical apparatus or not and judging whether the fault exists in the section of the gas insulated totally-enclosed combined electrical apparatus: solvable using the following formula
Wherein, ViThe interference signal is filtered to remove a direct current term, then is mixed with a reference signal cos (ω t), and then is subjected to low-pass filtering to obtain a signal; s2 is a signal obtained by low-pass filtering after the interference signal is mixed with a reference signal sin (ω t) after the direct-current term is filtered; a is the amplitude of the light intensity of the laser pulses I and II, andthe light intensity of the light pulse, the splitting ratio of the coupler and the polarization state of the two beams of light are related.
The calculation formula is obtained by the following method:
the interference output signal I is:
wherein G is the direct current term of the light intensity, the amplitude of the light intensity of the laser pulse I and the laser pulse II of A is related to the light intensity of the laser pulse, the splitting ratio of the coupler and the polarization state of the two beams of light, and the omega heterodyne angular frequency,
t is the time for the signal under test.
After the interference signal is subjected to photoelectric conversion, the direct current term of the formula (1) is filtered out to obtain
The demodulation process requires the use of two reference signals:
yr1＝cos(ωt) (3)
yr2＝sin(ωt) (4)
in the formula, the angular frequency ω is modulated by the AOM and belongs to a known signal.
After the sensing signal (2) is mixed with the reference signals (3) and (4) respectively, the obtained signals are
By low-pass filtering equations (5) and (6), the information on
A pair of orthogonal terms of
By Vq/ViTo obtain
Then using arc tangent operation to obtain the signal to be measured
The method for judging whether a fault exists in the interior of the subsection of the gas insulated totally-enclosed combined electrical apparatus or not and the subsection with the fault exists comprises the following steps: in a two-dimensional coordinate system, length segments are taken as an X axis, monitoring time is taken as a Y axis, and phase change signals are represented in the coordinate system
The abnormal signals in the system are expressed by different colors to deviate from the normal signals, whether faults exist is judged according to the abnormal signals in a coordinate system, the fault position is judged according to an abscissa, the fault time is judged according to an ordinate, and the severity and possible reasons of the faults are judged according to the colors.
The invention is further illustrated below using two specific examples.
For a GIS substation, the total length of the metal-grounded enclosure will typically not exceed 5 km. For the application scenario of the 5 km-length optical cable, the currently mature DAS system can divide the 5 km-length optical cable into 5000 segments, each segment is 1 meter, and can simultaneously monitor the vibration signals received by the 5000 segments of the 1-meter-length optical cable and present the vibration signals in real time. If we lay the cable along the outside of the metal-grounded enclosure (as shown in fig. 2) and sense the vibration (sound) signal from the internal GIS equipment through the cable coupled to the metal enclosure, we can simultaneously monitor the vibration signal along the cable every 1 meter long section.
It can be presented in real time by off-site monitoring equipment (as shown in fig. 3). In the figure, the X-axis (horizontal axis) numbers represent segments per 1 meter on the cable (numbers from 150 to 1080 as shown in the field of view in fig. 3) and the Y-axis (vertical axis) represents time, 10 seconds as shown in the field of view in fig. 3. While the different colors represent the signal magnitude corresponding to the X, Y position, as shown in the figure, yellow is the largest and blue is the smallest. In fig. 3, near the leftmost position, which is about 240 serial numbers, there is a stripe which crosses up and down and shows regularity, which means that within the 10 seconds, there is a stable and regular vibration signal near 240 meters.
As shown in fig. 4 on a normal time domain diagram. The form presented through the waterfall layout can simply and intuitively observe the overall situation of thousands of channels by utilizing a two-dimensional view and matching colors, and once an abnormal signal appears in a certain channel, the abnormal position can be seen at a glance, so that the abnormal position can be quickly and effectively positioned on site.
In the process of making an insulating withstand voltage test, each monitoring section has a corresponding normal vibration signal under normal conditions, but once breakdown occurs, the vibration felt by a metal shell nearby where breakdown failure equipment is located is inevitably far larger than that of the metal shell at other places. These vibration signals can be displayed in real time on an off-site monitor (as shown in fig. 5), thereby greatly facilitating the rapid and efficient location of the malfunctioning device on site. As shown in fig. 5, it indicates that an abnormal signal appears around the 800 th sequence number (at about 816 m) from the 8 th second for about 1 second.
A5 km length of cable was used, with each 1 meter length of cable being treated as a sound (vibration) sensor. If the 5km optical cable is wound outside the GIS closed metal shell, the equivalent is that 5000 receivers (channels) are uniformly distributed on the GIS closed metal shell along the pipeline direction. The sensing cable is wound outside the GIS enclosed metal casing as shown in fig. 6. The system adopts a high-performance embedded system, can simultaneously monitor the sound signals of the 5000 channels and transmits the demodulated sound signals to the background server in real time. The frequency characteristic of the system for monitoring 5000 channel signals (with the sampling rate of 2500Hz) in real time aiming at an optical cable with the length of 5km is 1Hz-1250 Hz. If a 2.5km long optical cable is used, the frequency characteristic of the real-time monitoring signal (sampling rate 5000Hz) is 1Hz-2500 Hz. Can satisfy GIS equipment and pass through the discernment demand that seals metal casing transmitted external sound signal characteristic.
Vibration signals at various positions along the GIS closed metal shell can be displayed in real time through monitoring equipment outside the field (as shown in figure 7). In the figure, the X-axis (horizontal axis) numbers represent segments per 1 meter on the cable (numbers from 180 to 1080 as shown in the field of view in fig. 7) and the Y-axis (vertical axis) represents time, 10 seconds as shown in the field of view in fig. 7. While different colors indicate the signal magnitude corresponding to the [ X, Y ] position, yellow being the largest and blue being the smallest. The bars show that an anomaly signal is present around 400 meters for about 1 second, starting at 7 th second.
By utilizing the DAS system, the vibration condition of the GIS closed metal shell along the way can be observed visually, vividly and in real time, so that an effective means for quickly positioning and puncturing the fault of the GIS equipment is provided for the insulation and voltage resistance test and the daily operation and maintenance process of a transformer substation after new construction, extension and disassembly maintenance.
In the daily operation maintenance process of GIS equipment, dispose the DAS system, at GIS closed metal casing winding DAS detection optical cable along the way, then when GIS equipment puncture trouble takes place, can see immediately, directly perceivedly where the equipment puncture trouble takes place.
In addition, the collected daily monitoring vibration data can be utilized to count, analyze and summarize vibration signals before breakdown of different equipment and vibration signals occurring when breakdown of GIS equipment occurs. On the basis, a machine learning algorithm SVM is adopted, and the breakdown position of the GIS equipment and whether dangerous signals suspected of generating faults exist in each position or not are intelligently identified on line.
The real-time domain signal in fig. 7, which is obtained by the SVM method, is represented as an event classification signal waterfall diagram shown in fig. 8.
Fig. 8 shows a waterfall graph, wherein X-axis (horizontal axis) numbers represent segments per 1 meter on the cable, and Y-axis (vertical axis) represents time, and color blocks at different positions [ X, Y ] represent event classifications. The correspondence between colors and event classification numbers is shown on the right side of the figure, with red representing the first type of event, green representing the second type of event, and so on.
It can be seen from the figure that at the position of the abnormal signal corresponding to fig. 8, this abnormal signal has been classified as a first type event (red) according to the SVM method.
To this end, in GIS system deploy
After the DAS, the DAS transmits data to a background server in real time, the background server adopts a machine learning algorithm SVM to identify real-time domain data of each channel (corresponding position) as events of different classifications, and combines the corresponding relation of the position and the equipment to obtain alarm information related to the equipment and the position in the GIS, and then different alarm strategies can be adopted, such as sound and light alarm, mailbox e-mail, mobile phone information prompt and the like, according to the emergency degree of each alarm information (such as prediction that the equipment can break down or break down soon is possible). Therefore, the conversion from passive maintenance to active maintenance is realized, namely the GIS equipment is passively subjected to fault maintenance after the GIS equipment is in fault, the GIS equipment is actively maintained at present, and unexpected power outage is avoided.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (4)
1. A fault detection method for a gas insulated totally-enclosed combined electrical apparatus is characterized by comprising the following steps: the method comprises the following steps:
(1) arranging the sensing optical fiber outside the shell along the length direction of the shell of the gas insulated totally-enclosed combined electrical appliance;
(2) the gas insulated totally-enclosed combined electrical apparatus is divided into a plurality of sections according to a certain distance, and a vibration signal in each section of the gas insulated totally-enclosed combined electrical apparatus is simultaneously monitored by using a sensing optical fiber, so that whether a fault exists in the section of the gas insulated totally-enclosed combined electrical apparatus or not and the section with the fault exists in the section of the gas insulated totally-enclosed combined electrical apparatus are judged.
2. The fault detection method of the gas insulated fully-closed combined electrical apparatus according to claim 1, characterized in that: the method for monitoring the vibration signal in the section of the gas insulated fully-closed combined electrical apparatus by using the sensing optical fiber comprises the following steps:
(2.1) sending two laser pulses I and II with different frequencies and a fixed time interval to a sensing optical fiber by using a laser, wherein the angular frequencies of the laser pulses I and II with different frequencies are different by omega; receiving two beams of reverse Rayleigh scattering signals I and II formed by two laser pulses A and B with different frequencies in a sensing optical fiber, and delaying the scattering signal I to enable the scattering signal I and the scattering signal II to be positioned at the same position to form interference;
(2.2) detecting phase change signals of the optical fiber caused by external physical reasons
The method is used as a basis for judging whether a fault exists in the section of the gas insulated totally-enclosed combined electrical apparatus or not and judging whether the fault exists in the section of the gas insulated totally-enclosed combined electrical apparatus: can be solved by the following formulaIs/are as follows
Wherein the content of the first and second substances,
Vithe interference signal is filtered to remove a direct current term, then is mixed with a reference signal cos (ω t), and then is subjected to low-pass filtering to obtain a signal;
Vqthe interference signal is obtained by low-pass filtering after filtering a direct current term and mixing with a reference signal sin (ω t);
a is the amplitude of the light intensity of the laser pulses I and II.
3. The fault detection method of the gas insulated fully-closed combined electrical apparatus according to claim 1, characterized in that: the method for judging whether the fault exists in the section of the gas insulated totally-enclosed combined electrical apparatus or not and judging whether the fault exists in the section of the gas insulated totally-enclosed combined electrical apparatus comprises the following steps: in a two-dimensional coordinate system, length segments are taken as an X axis, monitoring time is taken as a Y axis, and phase change signals are represented in the coordinate system
The abnormal signals in the system are expressed by different colors to deviate from the normal signals, whether faults exist is judged according to the abnormal signals in a coordinate system, the fault position is judged according to an abscissa, the fault time is judged according to an ordinate, and the severity and possible reasons of the faults are judged according to the colors.
4. The fault detection method of the gas insulated fully-closed combined electrical apparatus according to claim 1, characterized in that: the method for judging whether the fault exists in the section of the gas insulated totally-enclosed combined electrical apparatus or not and judging whether the fault exists in the section of the gas insulated totally-enclosed combined electrical apparatus comprises the following steps: identifying real-time domain data of each channel (a group of data of the same abscissa at different time is a channel) as events of different classifications by adopting a machine learning algorithm, and obtaining equipment in a GIS (geographic information System) and alarm information related to the position by combining the corresponding relation of the position and the equipment; and adopting different alarm strategies according to the emergency degree of each alarm message.
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