KR100231523B1 - Monitoring method for gis - Google Patents

Abstract

The present invention relates to a method of monitoring a GIS (SF ₆ Gas Insulated SwitchGear), is operated by an operating device operating with compressed air supplied by the compressor provided with the circuit breaker to open and close a current of each phase and the interior of the circuit-breaker SF ₆ A method of monitoring a gas filled and sealed GIS, comprising: a current flowing through the breaker, an SF ₆ gas temperature inside the breaker, an SF ₆ gas pressure inside the breaker, an air pressure of the operating device, The sensing means detects the opening and closing operation of the circuit breaker and the partial discharge of the circuit breaker, accumulates the sensed data in the data accumulating means, and at the same time the processor continuously reads and processes the accumulated data. The processed result is stored in the data storing means, displayed on the display means, and an abnormal value higher than the reference value stored in the processing part is detected. If it is determined that the alarm, the alarm means through the alarm means, according to the GIS monitoring method, by monitoring the GIS in real time to predict and diagnose the failure to detect the failure early, the expansion of the failure It is possible to supply power stably by preventing the damage.

Description

Monitoring method of gas insulation switchgear

The present invention relates to a method for monitoring GIS (SF ₆ Gas Insulated SwitchGear).

In recent years, substation facilities have become high voltage as demand for electric power increases.

In order to install substation facilities in dense factories or urban areas around large cities, it is becoming increasingly difficult to purchase land due to rising land prices, and serious consideration should be given to the contamination, noise pollution, and safety of insulation due to salt, dust, etc.

In addition, it is difficult to supply manpower due to the advancement of the industry. Therefore, automation of operation, rationalization of maintenance and improvement of installation work are required, and a small high voltage substation facility that can be installed in a basement of a building is required. Conventionally, opening and closing mechanisms for insulating conductors by the atmosphere cannot meet this demand.

Thus, to solve this problem, SF ₆ gas insulated switchgear (SF ₆ Gas Insulated SwitchGear) significantly reduced the volume by using a SF ₆ has a high insulating power that is, a GIS is developed.

The GIS is composed of a circuit breaker, disconnector, ground breaker, bus, current transformer, lightning arrester and instrument transformer, and all the devices are completely enclosed in a tank filled with SF ₆ gas. (For example, contamination of insulators and bushings, location of substations, safety, etc.) has been eliminated.

By the way, the GIS has a number of advantages over the conventional substation equipment, but because all the equipment is located in a closed tank, it is difficult to grasp the status of the substation equipment or maintenance, and it takes a lot of time and effort to recover in case of an accident. In the event of an accident, the power outage zone becomes wider due to the large-capacity ultra-high pressure of the current substation, which causes a lot of problems in the supply of electricity. This will cause huge damage to production.

Therefore, there is a strong demand for a monitoring apparatus and method for predicting and diagnosing a failure in advance.

The present invention was developed in response to this demand, and an object of the present invention is to monitor the GIS in real time to predict and diagnose a failure, and to detect the failure at an early stage, thereby preventing the expansion of the failure and supplying the GIS stably. To provide a monitoring method.

1 is a schematic diagram showing a SF ₆ gas insulated switchgear (GIS) to which the present invention is applied;

2 is a block diagram showing a GIS monitoring apparatus of the present invention;

3 is a schematic flowchart illustrating a process of the processing unit of FIG. 2;

4 is a detailed flowchart for processing data by current flowing in the breaker detected by the current sensing means.

<Description of the code | symbol about the principal part of drawing>

20: sensing means 21: current sensing means

23 gas sensing means 25 gas pressure sensing means

27: air pressure detection means 29: opening and closing operation detection means

31: partial discharge detection means 33: internal temperature detection means

35: ambient temperature detection means 37: gas humidity detection means

39: compressor detection means 40: data storage means

50 processing unit 60 display means

70: alarm means 80: command input means

Monitoring method of the GIS according to the present invention is provided by a circuit breaker for opening and closing the current of each phase is operated by the operating device operating by the compressed air supplied from the compressor, the inside of the breaker is filled with SF ₆ gas is sealed GIS In the method of monitoring,

Means for detecting the current flowing through the breaker, the SF ₆ gas temperature inside the breaker, the SF ₆ gas pressure inside the breaker, the air pressure of the operating device, the opening and closing operation of the breaker, and the partial discharge of the breaker Detects and stores the detected data in the data storage means and at the same time the processor continuously reads and processes the accumulated data, and stores the processing result processed by the processor in the data storage means, and displays the data. On the other hand, if it is determined that an abnormal value higher than the reference value stored in the processing unit is detected, the alarm means to give an alarm sound.

The sensing means may further detect the temperature inside the operating device to measure an operation time of each component of the operating device due to the temperature inside the operating device to prevent an accident in advance.

In addition, the sensing means may further detect the temperature around the GIS to prevent accidents due to external fires or other influences in advance.

In addition, the sensing means may sense the additional humidity of the SF ₆ gas to know the isolated force destruction due to the moisture contained in the SF ₆ gas.

In addition, the detection means further detects the current of the compressor motor, the processing unit calculates the number of operation of the compressor and the amount of supply air based on the current of the motor, the time taken from the stop of the compressor to the start and the ambient temperature The abnormal state of the furnace compressor may be determined and output through the display means and the alarm means.

In addition, the sensing means may further detect the pressure drop of the air due to leakage of the air pipe line or the failure of the pump in advance to further detect the pressure of the compressor and the temperature of the compressor tank so as not to affect the GIS operation.

In addition, the opening and closing operation detection of the sensing means preferably detects the opening and closing operation time of the main contact and the opening and closing operation time of the auxiliary contact at the same time.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the present invention will be described in detail.

1 is a schematic diagram showing a SF ₆ gas insulated switchgear (GIS) to which the present invention is applied, and only the GIS for one of three phases of the power source is shown.

As shown, the circuit breaker 1 is a device in which the power is cut off when an electric current of more than the rated current flows due to an accident, and the circuit breaker 1 is a compressed air `and manually operated to block the current 2 ) Is combined.

On the output side of the circuit breaker 1, a bus bar 3, which is a type of distributor for branching a large number of electricity passing through the circuit breaker 1, is coupled, and a circuit is opened and closed on the input side and the output side of the circuit breaker 1. Or a disconnector (5) (7), which is a type of switchgear used for the purpose of changing a connection, and the earthing switch (9) which facilitates grounding from the outside during maintenance or inspection because the charging part of the GIS is not exposed. 11 is coupled to the input side and the output side of the circuit breaker 1, and the current transformers 13 and 15, which send down the current flowing through the wire and send it to the instrument, are coupled to a predetermined position.

The ground breakers 9 and 11 are interlocked with the disconnectors 5 and 7 and the breaker 1 to prevent accidental accidents due to inadvertent operation.

The bus bar 3 and disconnector 7 are operated by compressed air or by hand.

The GIS sensing device to which the present invention is applied may be applied to each device constituting the GIS. Hereinafter, the sensing device detecting the state of the circuit breaker will be described as an example.

As shown in Fig. 2, the monitoring device for monitoring the GIS includes a current flowing through the circuit breaker 1, SF ₆ gas charged inside the circuit breaker 1, and an operating device 2 for operating the circuit breaker 1. Compressed air to be supplied, the detection means 20 for detecting the state values such as partial discharge and opening and closing of the breaker (1), and the data accumulating to store and accumulate the data and processed data detected by the detection means 20 A means for diagnosing the state of the GIS and predicting a failure based on the means 40, the data stored in the data accumulating means 40, and a display for displaying the results and judgments processed by the processor 50 Means (60), alarm means (70) for generating an alarm when it is determined that the breaker (1) is in an abnormal state based on the results and judgments processed by the processor (50), and the user wants the processor (50). Consisting of command input means (80) for inputting a command to instruct .

The sensing means 20 is a current flowing through the breaker 1, SF ₆ gas charged inside the breaker 1, compressed air supplied to the operation device 2 for operating the breaker 1, the breaker (1) ) The number of phases is installed so as to independently detect the state values such as partial discharge and opening / closing, the temperature inside the control device (2) and the temperature outside the breaker (1) for each phase. Three sets are installed.

The sensing means 20 includes a current sensing means 21 for sensing a current flowing in the breaker 1 so as to predict a power load and a ground fault based thereon, and the progress and temperature rise of the arc inside the breaker. Gas temperature detecting means 23 for detecting the temperature of the SF ₆ gas charged in the circuit breaker 1 and the operation difference according to the leakage or pressure of the SF ₆ gas. The gas pressure detecting means 25 for detecting the gas pressure inside the breaker 1 and the compressed air inside the operating device 2 to know the operating state of the device according to the compressed air for operating the operating device 2. Air pressure detecting means 27 for detecting pressure, opening and closing operation detecting means 29 for detecting the opening and closing operation time of the breaker 1, and partial discharge detecting means 31 for detecting partial discharge inside the breaker 1; )

In addition, the sensing means 20 measures the change in the operating time of each component of the operating device 2 due to the temperature inside the operating device 2 to prevent the accident in advance to prevent the temperature in the operating device 2 in advance. Internal temperature detecting means (33) for detecting the, ambient temperature detecting means (35) for detecting the temperature around the breaker (1) to prevent accidents due to external fire or other effects, and the breaker (1) inside the pressure of the air caused by and the SF to know the isolated force destruction due to the moisture contained in the _six gas SF ₆ gas humidity, gas humidity sensing means 37 for sensing the charge air pipe failure of the leakage or the pump of the line, etc. It is preferable to further include a compressor detecting means 39 which detects the degradation in advance and does not affect the circuit breaker operation so as to sense the current, pressure and temperature of the compressor tank.

The opening and closing operation detecting means 21 is a main contact opening and closing operation detecting means for detecting the opening and closing operation time of the main contact of the circuit breaker 1, but the auxiliary point opening and closing operation detection for detecting the opening and closing operation time of the auxiliary contact of the circuit breaker 1 It is preferable to further provide a means.

The sensing means 20 includes a current detection sensor, a temperature sensor, a pressure sensor, a timer, an ultrasonic sensor, a humidity sensor, etc. suitable for each measurement state quantity, and the detection signal is continuously detected and digitized, and then the data is accumulated. Stored in the means 40 continuously.

The data accumulating means 40 is a storage device to which the processing unit 50 can access the storage value, for example, a storage element or a hard disk device.

The processing unit 50 is composed of a central processing unit (CPU), an auxiliary operation unit, a RAM (RAM), a ROM (ROM), etc. to assist with calculation / processing.

The display means 60 is a display device such as a monitor, the alarm means 70 is a speaker to generate sound, and the command input means 80 is a device such as a keyboard mouse.

Hereinafter, the GIS monitoring method of the present invention will be described with reference to a sensing device.

Each state value of the GIS detected by the sensing means 20 is accumulated in the data accumulating means 40 and the processing unit 50 continuously reads and processes the accumulated data, and then the processing result is stored in the data accumulating means ( 40 is displayed and displayed on the display means 60, and when it is determined that an abnormal value higher than the reference value stored in the processing unit is detected, an alarm sounds through the alarm means 70, and the command input means 80 The user can monitor the GIS effectively by software that inputs a command to the processing unit 50 and inputs a reference value.

That is, the current of the circuit breaker detected by the current sensing means 21, the SF ₆ gas temperature inside the circuit breaker sensed by the gas temperature sensing means 23, and the gas pressure sensing means 25 SF ₆ gas pressure inside the circuit breaker, the air pressure of the operating device detected by the air pressure detecting means 27, whether or not the opening and closing of the circuit breaker detected by the opening and closing operation detecting means 29 and the operating speed, The display means 60 after the arc duration of the circuit breaker detected by the partial discharge detecting means 31 and the GIS ambient temperature detected by the ambient temperature detecting means 35 are continuously detected and processed. On the other hand, when it is determined that an outlier higher than the reference value stored in the processing unit 50 is detected, the alarm means 70 makes an alarm sound.

Then, the operation frequency of the compressor and the amount of supply air are calculated based on the current of the motor sensed by the compressor detecting means 39, and the abnormal state of the compressor is determined based on the ambient temperature of the time taken from the stop of the compressor to start up. Output through the display means and the alarm means.

This is done by judging that there is air leakage in the compressor when the frequency of operation of the compressor decreases, and wear of the components of the compressor when the time between start and stop is long.

The processing unit processes the signal sensed by the sensing means and accumulated in the data accumulating means at various angles to compare the time due to the deviation and the operating speed, and to show the arc duration as well as the overall time of opening and closing. This can be recognized by indicating the time to initialize the operating state and by marking the boundaries of the initial and final main currents in each phase when the operation is started.

At this time, the processing unit compares the time difference between the overall operating time when opening and closing the breaker and each phase when opening and closing each phase in parallel analysis for the time difference for the purpose of accurate classification.

In addition, the processing unit also shows the air pressure and SF ₆ gas pressure, current and ambient temperature for the operation of each breaker.

That is, based on the signal detected by the sensing means, the processing unit accumulates the accumulated weight of the circuit breaker, the life of the circuit breaker, the frequency of operation, the operating time, the operating device mechanical component state, the time change according to the pressure of the compressor, and the leakage of the compressor. , The wear of the component, the test value for setting the default value, the speed of the machine components of the operating device, the arc duration during opening and closing of the breaker, etc. are calculated and displayed on the display means.

In addition, the processing unit, the difference between each phase during the opening and closing operation of the breaker, the deviation of the cycle time of the compressor and the set reference value, the deviation of the charging time of the compressor and the set reference value, the deviation of the SF ₆ gas pressure and the set reference value, air pressure After calculating the time difference between the charging time and the set reference value and determining, if an abnormal condition appears, an alarm is generated through the alarm means.

A schematic flowchart of the processing of such a processing unit is illustrated in FIG. 3.

As shown, after setting the reference value input from the command input means (S1), receiving the detected value accumulated in the data accumulating means (S2), calculating a comparison value (S3), and comparing the comparison value with the reference value By comparing and determining (S4), an alarm is generated when it is out of the range of the set reference value (S8), and stored in the data storage means (S5) when it is out of the range of the set reference value (S5), after determining whether it is data to be output (S6), If the data to be output is displayed on the display means (S7), the process returns to step 2 (S2) and the process is repeated. If the data is not to be output, the process returns to step 2 (S2) immediately.

On the other hand, the alarm data generated in step 8 (S8) proceeds to step 5 (S5) to accumulate data in the data accumulating means and to continue the processing of the next step.

Next, an example of a method of processing the current data sensed by the current sensing means will be described in more detail according to a flowchart. In the following flow chart, the setting of the reference value by the command input means and the step of storing the data in the data setting means are omitted in the flow chart and described with a flow chart for one phase.

As shown in Fig. 4, after initializing the current value (s11), the sensing current value stored in the data accumulating means is received (S12), and the sensing current value is calculated (S13). Comparing and determining the current value (S14), an alarm is generated when the calculated value is out of the range of the set reference current value (S17), and after determining whether it is data to be output unless it is out of the range of the set reference current value (S15), If the data to be output is displayed on the display means (S16), the process returns to step 12 (S12) and the process is repeated. If the data is not to be output, the process returns to step 12 (S12) immediately and repeats the process. At this time, the data that generated the alarm in step 17 (S17) proceeds to step 15 (S15) to continue the processing of the next step.

SF ₆ gas temperature inside the breaker sensed by the gas temperature sensing means, SF ₆ gas pressure inside the breaker sensed by the gas pressure sensing means, and air pressure of the operating device sensed by the air pressure sensing means. And the SF ₆ gas inside the breaker detected by the gas humidity sensing means and the opening / closing action of the breaker detected by the opening / closing motion detecting means, the partial discharge inside the circuit breaker detected by the partial discharge detecting means. The degree of moisture contained is also processed by an algorithm similar to the method of processing the current data sensed by the current sensing means (illustrated in the flow chart of FIG. 4).

In the above description, the basic processing method has been described, but the present invention is not limited thereto. The data sensed by the sensing means and stored in the data accumulating means may be variously processed by various software and output in various output methods.

According to the GIS detection method according to the present invention, by monitoring the GIS in real time to predict and diagnose the failure to detect the failure early, it is possible to stably supply power by preventing the expansion of the failure.

Claims (7)

In the method for monitoring a GIS that is closed by a SF ₆ gas filled in the circuit breaker is provided with a circuit breaker that is operated by the operating device operating by the compressed air supplied from the compressor to open and close the current of each phase, Means for sensing the current flowing through the breaker, the SF ₆ gas temperature inside the breaker, the SF ₆ gas pressure inside the breaker, the air pressure of the operating device, the opening and closing operation of the breaker, and the partial discharge of the breaker Detected by The sensed data is accumulated in the data accumulating means and at the same time, the processor continuously reads and processes the accumulated data. The processing result processed by the processing unit is stored in the data accumulating means and displayed on the display means, GIS monitoring method for generating an alarm sound through the alarm means when it is determined that an outlier higher than the reference value stored in the processing unit is detected. The method of claim 1, The sensing means of the GIS monitoring method, characterized in that for further detecting the temperature in the operating device to prevent the accident by measuring the change in the operating time of each component of the operating device due to the temperature of the operating device. The method of claim 1, The sensing means of the GIS monitoring method, characterized in that for additionally detecting the temperature around the GIS to prevent accidents due to external fire or other effects. The method of claim 1, The sensing means in the method of monitoring a GIS, characterized in that for detecting the humidity of the SF ₆ gas in addition to know the isolated force destruction due to the moisture contained in the SF ₆ gas. The method of claim 1, The sensing means further detects the current of the compressor motor, The processor calculates the frequency of operation of the compressor and the amount of supply air based on the current of the motor, and determines the abnormal state of the compressor based on the time taken from stop to start of the compressor and the ambient temperature. GIS monitoring method characterized in that the output through the display means and the alarm means. The method of claim 5, The sensing means monitors the pressure of the compressor and the temperature of the compressor tank to further detect the pressure drop of the air due to leakage of the air pipe line or the failure of the pump, so as not to affect the GIS operation. Way. The method of claim 1, The opening and closing operation detection of the sensing means for monitoring the opening and closing operation time of the primary contact and the opening and closing operation time of the auxiliary contact at the same time characterized in that for monitoring.