KR101128421B1 - Instant pressure rise detecting switch for a gas insulated switchgear and control method thereof - Google Patents

Abstract

The present invention discloses an instantaneous pressure rise detection switch and control method of a gas insulated switchgear for detecting an instantaneous pressure rise of an internal filling gas according to an arc generation and outputting an alarm signal for switching in response to a fault condition. The instantaneous pressure rise detection switch of the switchgear, the pressure sensor unit for detecting the gas pressure in the gas insulated switchgear; An alarm signal output unit for outputting an alarm signal; And measuring a current pressure using the pressure sensor unit a predetermined number of times for a predetermined sampling time at each sampling time point of a predetermined period, and sampling the current by averaging the maximum and minimum values of the pressure values measured during the sampling time at the sampling time point. Obtaining a current average value corresponding to a time point, and determining whether the current average value at the current sampling time point falls outside a reference value of an allowable range based on a current reference value defined by averaging average values obtained for each sampling time point for a predetermined time period before the current time. It characterized in that it comprises a control unit for controlling the output of the alarm signal.

Description

Instant pressure rise detecting switch for a gas insulated switchgear and control method

The present invention relates to a gas insulated switchgear, and more particularly, the instantaneous pressure of the gas insulated switchgear for detecting an instantaneous pressure rise of the internal filling gas due to arc generation and outputting an alarm signal for switching in response to a fault condition. Rising sensing switch and control method.

Gas Insulated Switchgear (hereinafter referred to as 'GIS') is a device used to protect the power system for indoor and outdoor power plants or substations. Safely open and close the power system to protect the power system.

GIS has a structure to collectively store the opening and closing facilities such as gas circuit breaker and disconnector, transformer, lightning arrester, main circuit bus, etc. in the metal tank, and the charging part is supported by a solid insulator, and has excellent insulation performance and fire extinguishing ability. SF6 gas is a system filled and sealed inside the tank.

In the event of an accident such as a short circuit, an arc may occur inside the GIS, and the arc causes an instantaneous temperature rise of several thousand to tens of thousands degrees, and the pressure of the SF6 gas in the GIS suddenly increases rapidly due to the temperature rise. To rise.

The pressure rise time and the degree of rise may vary slightly depending on the size and shape of the gas blocker and the gas compartment, but generally rise more than 0.3 bar within 30m seconds.

Therefore, there is a need to stably protect the power system by detecting an abnormal state in which the pressure inside the GIS rapidly rises in a short time due to an accident such as power failure.

If the pressure switch is not installed in the conventional GIS, the SF6 gas must be collected from several blocking and gas compartment suspected arcs in order to detect the pressure change, and the location of the arc generation must be found by analyzing the components of the SF6 gas. do. Therefore, in this case, there is a problem that it is difficult to easily find the arc generation position.

In addition, when a pressure switch is installed in a conventional GIS, a pressure switch may generate an alarm signal when a preset pressure value is reached. However, in this case, when the internal temperature of the cutoff and gas compartment increases due to the external environment, the internal pressure is changed accordingly, and an alarm signal is generated in excess of the set value. There was a problem of providing an alarm signal.

In addition, even if an arc occurs in a state where the internal pressure drops by more than 0.3 bar due to leakage of the shutoff part and the gas compartment, or the ambient temperature drops, the internal pressure is preset for detection due to the buffer effect caused by the dropped pressure. There was a problem that the alarm signal does not occur because the pressure does not reach.

Due to the above characteristics, the conventional pressure switch installed in the conventional GIS has a problem that is not suitable for measuring the instantaneous pressure change of the blocking section and the gas compartment.

In order to solve the above problems, an object of the present invention is to provide an instantaneous pressure rise detection switch and control method of a gas insulated switchgear that can detect an instantaneous pressure rise of the internal filling gas due to an arc generated by an accident such as a short circuit. It is done.

In addition, the present invention outputs an alarm signal corresponding to the average value of the pressure currently measured pressure compared to the last updated reference value when the difference is out of the allowable range while updating the reference value to the average value of the pressures measured at predetermined intervals for a predetermined time. It is another object of the present invention to provide a switch and a control method for detecting a pressure increase in the gas insulated switchgear.

In addition, the present invention provides a momentary pressure rise detection switch and a control method of the gas insulated switchgear that can set the pressure change rate, that is, the allowable range and the sampling period with a simple button operation and can easily check the setting state with another object. do.

Another object of the present invention is to provide an instantaneous pressure rise detection switch and a control method of a gas insulated switchgear having a function of informing about a temperature sensor installed in a circuit when the operating temperature is out of a set range.

The instantaneous pressure rise detection switch of the gas insulated switchgear according to the present invention for achieving the above object, the pressure sensor unit for detecting the gas pressure inside the gas insulated switchgear; An alarm signal output unit for outputting an alarm signal; And measuring a current pressure using the pressure sensor unit a predetermined number of times for a predetermined sampling time at each sampling time point of a predetermined period, and sampling the current by averaging the maximum and minimum values of the pressure values measured during the sampling time at the sampling time point. Obtaining a current average value corresponding to a time point, and determining whether the current average value at the current sampling time point falls outside a reference value of an allowable range based on a current reference value defined by averaging average values obtained for each sampling time point for a predetermined time period before the current time. It characterized in that it comprises a control unit for controlling the output of the alarm signal.

Herein, the controller includes a current if the current average value of the sampling time point does not deviate from a reference value of an allowable range based on the current reference value defined by averaging average values obtained for each sampling time point for a predetermined time before the current time. The current reference value may be updated by averaging the average values obtained for each sampling time for a predetermined time.

And, if the current average value of the current sampling time point is outside the reference value of the allowable range based on the current reference value defined by averaging the average values obtained for each sampling time point for a predetermined time before the present time, a predetermined verification time The current pressure is measured using the pressure sensor unit for a predetermined number of times, and a verification average value is obtained by averaging the pressure values except for the maximum value and the minimum value among the pressure values measured during the verification time, and the verification average value is constant before the current. Verification monitoring to determine whether the reference value of the allowable range based on the current reference value defined by averaging the average values obtained for each sampling time point over time may be further performed before controlling the output of the alarm signal.

The control unit may further include a button unit used to set at least one of the sampling time point and the allowable range, and a state display unit which distinguishes the setting state of at least one of the sampling time point and the allowable range. At least one of the sampling time point and the allowable range is reset by the setting of the button unit, and the reset state may be displayed through the state display unit.

The controller may further perform an initialization process corresponding to power-on, and the initialization process may be performed by sequentially reading the pressure values for a predetermined number of times during a predetermined initialization time and excluding the maximum and minimum values among the pressure values. And calculating the initial average value by averaging the pressure values, setting the initial average value to the current reference value, and resetting at least one of the sampling time point and the allowable range by the setting of the button unit.

The sampling time point may be set to one of 20 msec, 30 msec, 50 msec or 100 msec.

The reference value of the allowable range may be set to a value of 10% of any one of 0.2 bar, 0.3 bar, 0.5 bar or 1.0 bar.

The apparatus may further include a memory configured to store at least the current reference value, the sampling time point, and the allowable range and interface with the controller.

The temperature sensor unit may further include a temperature sensor unit installed in the circuit unit constituting the pressure sensor unit, the alarm signal output unit, and the control unit. When a signal corresponding to a temperature outside the preset operating temperature is transferred from the temperature sensor unit to the control unit, The controller may perform alarm control corresponding thereto.

The instantaneous pressure rise detection control method of the gas insulated switchgear according to the present invention includes the steps of measuring the current pressure by a predetermined number of times for a predetermined sampling time at each sampling point of a predetermined period; Obtaining a current average value corresponding to the current sampling time point by averaging the maximum and minimum values of the pressure values measured during the sampling time at the sampling time point; And controlling the output of the alarm signal by determining whether the current average value at the current sampling time point falls outside a reference value of an allowable range based on a current reference value defined by averaging average values obtained for each sampling time point for a predetermined time period before the current time. Characterized in that it comprises a step.

Here, if the current average value of the current sampling time point does not deviate from a reference value of an allowable range based on the current reference value defined by averaging the average value obtained for each sampling time point for a predetermined time period before the present time for a predetermined time including the present time. The method may further include updating the current reference value by averaging the average values obtained for each sampling time point.

If the current average value of the sampling time point is out of an allowable range based on the current reference value defined by averaging the average values obtained for each sampling time point for a predetermined time period before the present time, further performing verification monitoring to perform the alarm signal. Controlling the output, wherein the verification monitoring comprises: measuring a current pressure using the pressure sensor unit a predetermined number of times during a predetermined verification time; Obtaining a verification average value by averaging the maximum and minimum values measured during the verification time; And determining whether the verification average value deviates from a reference value of an allowable range based on the current reference value defined by averaging average values obtained for each sampling time point for a predetermined time before the present time.

In addition, an initialization process corresponding to power-on may be further performed. The initialization process may further include sequentially reading the pressure value for a predetermined number of times during a predetermined initialization time; Calculating an initial average value by averaging the remaining pressure values except for the maximum value and the minimum value among the pressure values; Setting the initial average value to the current reference value; And resetting at least one of the sampling time point and the allowable range.

When the temperature sensor unit installed in the pressure sensor unit, the alarm signal output unit, and the circuit unit constituting the control unit senses a temperature outside the preset operating temperature, an alarm control corresponding thereto may be further performed.

Therefore, according to the present invention, since the instantaneous pressure rise of the internal filling gas due to the arc generated by an accident such as a short circuit can be detected, there is an effect of enabling rapid discovery and recovery of the accident.

In addition, the present invention can set the pressure change rate and the sampling period with a simple button, and can easily check the setting state for them with the naked eye, there is an effect that can prevent malfunction due to operational convenience and malfunction.

In addition, the present invention can sense the operating temperature of the circuit, it is possible to check the state in which the circuit operation is not performed normally due to the abnormal temperature environment has the effect of ensuring the reliability of the product.

In addition, the present invention does not require a temperature compensation algorithm corresponding to the temperature of the gas, a sensor for measuring the temperature of the gas and a calibration procedure using the same, and can be composed of simple components, thereby ensuring the economics of the product. have.

1 is a block diagram showing an instantaneous pressure rise detection switch of a gas insulated switchgear according to the present invention.
Figure 2 is a flow chart illustrating a method of controlling the instantaneous pressure rise detection of the gas insulated switchgear according to the present invention.
3 is a time versus pressure change graph for explaining the pressure value detection method according to the present invention.

Hereinafter, the same reference numerals will be described in detail with reference to the accompanying drawings, with reference to the same components preferred embodiments of the present invention. The terms or words used in the specification and claims are not to be construed as being limited to conventional or dictionary meanings, but should be construed as meanings and concepts corresponding to the technical matters of the present invention.

Referring to Figure 1 the instantaneous pressure increase detection switch of the gas insulated switchgear according to the present invention is the pressure sensor 10, the signal processing unit 12, the control unit 14, the memory 16, the button unit 20, the temperature control unit (22), a status display section 24 and an alarm signal output section 26.

Here, the pressure sensor 10 and the signal processing unit 12 constitute a pressure sensor unit, and the pressure sensor 10 is installed at the gas shutoff unit and the gas compartment unit (not shown) of the gas insulated switchgear so as to suppress the pressure of the SF6 gas. The signal processor 12 may be configured as an analog-to-digital converter for converting the analog signal output from the pressure sensor 10 into a digital signal and transferring the analog signal to the controller 14.

As described above in the present invention, when the pressure sensor 10 is installed in the gas shut-off part and the gas compartment, when the arc occurs inside due to an accident such as power failure of the power system, the location where the arc is generated is detected by detecting the fault location. It may be used to determine, and includes a configuration for detecting and alerting the instantaneous pressure rise due to the arc of the gas.

To this end, the control unit 14 performs control operations for detection and alarm by an algorithm (initialization process, normal monitoring and verification monitoring) defined by a program such as firmware capable of storing the detection and alarm control in itself or in the memory 16. The memory 16 performs pressure values sensed by the pressure sensor 10 and transmitted through the signal processor 12, an initialization sampling cycle for initial pressure measurement, a normal sampling cycle, a verification sampling cycle, and an allowable range (pressure The amount of change) can be stored. Among these, the initialization sampling period and the verification sampling period may be applied at a predetermined time, and the setting state may be changed by the user for the normal sampling period and the allowable range.

The memory 16 may use a nonvolatile memory that does not lose data even when power is not supplied. A flash memory, a ferromagnetic memory, or the like may be used as the nonvolatile memory.

The button unit 20 is configured to vary the sampling time point and the allowable range for the normal monitoring, and the button unit 20 is used to set the button (not shown) and the allowable range for setting the sampling time of the normal monitoring. A button (not shown) may be provided, and at this time, the button may be configured as a push button, and a signal according to an operation state of the button is input to the controller 14.

In addition, the state set by the button unit 20 may be displayed as the state display unit 24 by the control unit 14, the state display unit 24 is a light emitting diode (LED) for displaying the setting state of the sampling time of the normal monitoring ( LED1 (not shown) and a light emitting diode (LED2 (not shown)) for indicating an allowable range setting state, respectively, may be included, and Tables 1 and 2 manipulate buttons of the button unit 20. Thus, various setting states of the period ΔT and the allowable range (a change in the pressure value, ΔP) at the sampling point of the normal monitoring are illustrated, and different display states are illustrated according to each setting state. As such, the state set by the user may be confirmed by checking the light emission states of the two light emitting diodes of the state display unit 24.

△ T (cycle at normal sampling time) setting method and LED 1 display Number of presses Set value LED 1 display One 10 msec Repeat 1000msec off after 1 time (200msec on, 200msec off) 2 30 msec Repeats 1000msec off after 2 times (200msec on, 200msec off) 3 50 msec Repeats 1000msec off after 3 times (200msec on, 200msec off) 4 100 msec Repeats 1000msec off after 4 times (200msec on, 200msec off)

△ P (allowable range) setting method and LED 2 display Number of presses Set value LED 2 display One 0.05bar Repeat 1000msec off after 1 time (200msec on, 200msec off) 2 0.1bar Repeats 1000msec off after 2 times (200msec on, 200msec off) 3 0.3 bar Repeats 1000msec off after 3 times (200msec on, 200msec off) 4 1.0 bar Repeats 1000msec off after 4 times (200msec on, 200msec off)

The setting state using the button unit 20 will be exemplarily described with reference to <Table 1> and <Table 2>.

If the number of pushes of the button for setting the period of the normal sampling point of the button unit 20 is once, the period of the normal sampling point is set to 10 msec, and the light emitting diode LED 1 of the status display unit 24 turns on for 200 msec and turns for 200 msec. The operation to be turned off is repeated once every 1000msec. If the number of times the button is pressed for setting the period of the normal sampling point of the button unit 20 is twice, the normal sampling period is set to 30 msec, and the light emitting diode LED 1 of the status display unit 24 is turned on for 200 msec and turned off for 200 msec. The operation is repeated twice every 1000msec. When the number of pushes of the button for setting the period of the normal sampling point of the button unit 20 is three times, the normal sampling period is set to 50 msec, and the light emitting diode LED 1 of the status display unit 24 is turned on for 200 msec and turned off for 200 msec. The operation is repeated three times every 1000msec. When the number of times the button is pressed for setting the period of the normal sampling time of the button unit 20 is four times, the normal sampling period is set to 100 msec, and the light emitting diode LED 1 of the status display unit 24 is turned on for 200 msec and turned off for 200 msec. The operation is repeated four times every 1000msec.

If the number of pushes of the button for setting the allowable range of the button unit 20 is once, the allowable range is set to 0.05 bar and the light emitting diode LED 2 of the status display unit 24 is turned on for 200 msec and turned off for 200 msec 1000 msec. Repeat once every time. Tolerance range of the button part 20 When the button is pressed twice, the allowable range is set to 0.1 bar and the light emitting diode LED 2 of the status display part 24 turns on for 200 msec and turns off for 200 msec twice every 1000 msec. Repeat. If the number of pushes of the button for setting the allowable range of the button unit 20 is three times, the allowable range is set to 0.3 bar and the light emitting diode LED 2 of the status display unit 24 is turned on for 200 msec and turned off for 200 msec 1000 msec. Repeat three times each time. If the number of pushes of the button for setting the allowable range of the button unit 20 is four times, the allowable range is set to 1.0 bar and the light emitting diode LED 1 of the status display unit 24 is turned on for 200 msec and turned off for 200 msec 1000 msec. Repeat four times each time.

In addition, the user may confirm that the power is normally applied by confirming that the status display unit 24 is normally displayed.

On the other hand, the alarm signal output unit 26 is a modem for transmitting an alarm signal to the wired or wireless, a warning light or a light emitting diode for visually confirming the alarm state by the control signal provided from the control unit 14, or hearing the alarm state It may be composed of any one or two or more of the speaker or buzzer that can be confirmed.

Operation of the momentary pressure increase detection switch of the gas insulated switchgear according to the present invention configured as described above is controlled by the control unit 14, the control unit 14 signals the pressure value sensed by the pressure sensor 10 Normal monitoring is performed at each sampling point of a predetermined cycle received through the processing unit 12, and if it is determined that the abnormal state is detected during the normal monitoring, verification monitoring is performed.

The operation of the controller 14 will be described with reference to FIGS. 2 and 3, and the instantaneous pressure rise detection operation of the gas insulated switchgear according to the present invention configured in FIG. 1 will be described with reference to the operation of the controller 14. .

First, the controller 14 may perform an initialization process before performing the above-described normal monitoring.

The initialization process may include the steps of initial pressure measurement (S10), initial average value calculation (S12), initial reference value storage (S14), and operation mode setting (S16).

By the sequential progress of the above-described steps, the controller 14 sequentially reads the pressure value by a predetermined number of times during the preset initialization time in response to the power-on (S10). At this time, the initialization time may be set to be the same as the verification time to be described later, and the initialization operation is preferably performed after the initial transition period of the power supply for a predetermined time after the power-on. That is, the controller 14 may be set to read the pressure value about 30 times for 1 msec after the power is stabilized.

Thereafter, the controller 14 calculates an initial average value by averaging the remaining pressure values except the maximum value and the minimum value among the read pressure values (S12), and then sets the initial average value in the memory 16 as the current reference value (S14). . At this time, excluding the maximum value and the minimum value is to exclude the influence of noise.

As described above, when the current reference value is set in the memory 16 as the initialization process is performed, the operation mode may be set by resetting the period and the allowable range at the normal sampling point by the setting of the button unit 20 (S16). At this time, the value of the period and the allowable range of the normal sampling time point to be reset may be selected with reference to Tables 1 and 2 and the selected value may be reset in the memory 16.

The controller 14 performs normal monitoring when the current reference value is set through the initialization process as described above. If the initialization process is not performed, the current reference value may be set by the controller 14 as a value preset and provided in the memory 16, and a selection thereof may be determined according to the manufacturer's intention.

The normal monitoring includes the steps of the current pressure measurement (S20), the current average value calculation (S22), determining whether it is within the allowable range (S24) and updating the current reference value (S26).

First, the controller 14 reads the pressure value periodically at each normal sampling time point and measures the current pressure (S20). That is, as shown in FIG. 3, the control unit 14 reads the pressure value sensed by the pressure sensor 10 for a predetermined number of times for a predetermined time at each time point having a constant period such as 10 msec, such as T1 and T2 to T7, and displays a current average value S22. Obtain That is, the control unit 14 reads 30 pressure values for a predetermined time of 1 msec, for example, at each sampling time point of 10 msec periods such as T1 and T2 to T2 and calculates a current average value with pressure values excluding maximum and minimum values. At this time, excluding the maximum value and the minimum value is to exclude the influence of noise, and the calculated current average value may be stored in the memory 16 by the controller 14 or in its own cache memory (not shown). have.

As described above, the present average value of the pressure is periodically calculated at predetermined sampling time points (S22). For example, when the sampling time point is set to a 10msec period, the current average value is calculated by averaging the remaining pressure values except the maximum value and the minimum value among the pressure values reading 30 pressure values for 1 msec every 10 msec. The time to read the pressure value for each sampling time point and the number of times for calculating the current average value may be variously set by the manufacturer, but it is preferable to set the period including several tens of sampling time points for accurate sensing.

Then, it is determined whether the current average value at the current sampling time is within the reference value of the currently set allowable range (S24). In this case, the reference value may be set based on a value of 10% of the currently set allowable range, and may be variously modified and set by the manufacturer.

More specifically, when the present average value is within 10% of the allowable range of the present reference value, the controller 14 determines that the state is normal and updates the present reference value with the value reflecting the present average value and resets it to the memory 16 (S26). If the current average value is out of 10% of the allowable range of the current reference value, the controller 14 determines that it is in an abnormal state and performs verification monitoring.

At this time, the current reference value compared with the current average value is set as the average value of the current average values calculated for a certain time before the current sampling point. If the current average value obtained at the current sampling point is determined to be in a steady state, the current reference value is currently sampled. Is updated to the average of the current average values calculated for a certain time period (including the current average value obtained at the current time).

The verification monitoring includes verification pressure measurement (S30), verification average value calculation (S32), determining whether the verification average value is within an acceptable range (S34) and alarm signal output (S36).

That is, the controller 14 measures the verification pressure by reading the pressure value for a predetermined number of times from the time when it is determined that the present average value obtained at the present sampling time point is out of the reference value (for example, 10%) of the allowable range (for example, S30). At this time, the measurement of the verification pressure may be started after a few msec from the time determined to be out of the allowable range, it can be illustrated that the verification pressure is measured about 30 times during 1msec.

The control unit 14 calculates a verification average value from the pressure values excluding the maximum value and the minimum value among the measured pressure values for verification (S32), and if the verification average value is within the reference value of the allowable range of the current reference value, it is determined as the normal state. When the normal monitoring is performed and the reference value of the allowable range of the current reference value deviates, the alarm signal output unit 26 controls to output an alarm signal.

As described above, the current reference value may be set in real time even when the internal temperature is increased due to the influence of the external environment and the pressure of the gas is increased or the pressure of the gas is decreased due to the decrease of the leak and the ambient temperature. It is possible to accurately detect the sudden pressure rise by the arc according to the current reference value varied by.

As described above, since the maximum value and the minimum value are not reflected in the calculation of the average value for setting the current reference value in the initialization process and the normal monitoring, the case where the pressure data is temporarily high due to noise may be excluded. It is possible to accurately detect the instantaneous pressure increase.

Referring to FIG. 3 by way of example, in the embodiment of the present invention, a current reference value defined as a value obtained by averaging average values measured for a predetermined time including four sampling points before the current sampling point and the present sampling point Assume that the mean value is set to compare.

In the case of the sampling time T5, the pressure value corresponds to a rising section in which the pressure value increases from A to B. In this case, the conventional method compares the pressure value of the sampling time T4 and the pressure value of the sampling time T5 and does not generate an alarm because the difference is not large. Since the pressure value at the sampling point T5 and the pressure value at the sampling point T6 are compared, the difference is not so great that no alarm is generated.

However, according to the present invention, in the sampling time point T5, the current reference value defined by averaging the average values sampled and measured at each of the sampling time points T1 to T4 may be set to A. Therefore, the sampling current average value and the current reference value A can be compared at the sampling time point T5. At this time, although the present average value of the sampling time T5 is slightly increased, the controller 14 does not control the generation of an alarm since it is not significantly different from the current reference value A. However, the current reference value defined at the sampling time point T5 and the sampling time point T6 subsequent to 10 msec after the sampling time point T5 are respectively averaged and measured at the sampling time points T6. At this time, the current average value B of the sampling time point T6 has a significant difference from the current reference value defined by averaging the average values sampled and measured at the sampling time points T2 to T5, respectively, so that the output of the alarm signal may be controlled by the controller 14.

As described above, even the smallest instantaneous upward pressure change can be detected, and the detection time or allowable range can be variably set, so that the detection of the instantaneous upward pressure change can be adjusted more finely or more insensitively.

In addition, the present invention is a circuit portion constituting the pressure sensor 10, the signal processing unit 12, the control unit 14, the memory 16, the button unit 20, the status display unit 24 and the alarm signal output unit 26 The temperature sensor unit 22 may be further installed, and the temperature sensor unit 22 senses an internal temperature of the circuit unit and provides a signal corresponding thereto to the controller 14, and the controller 14 may operate at a normal operating temperature (for example, Outside the range of -20 ° C to 80 ° C) by blanking both light emitting diodes constituting the status display part 24, it is possible to indicate that the instantaneous pressure rise detection switch of the gas insulated switchgear does not operate normally when the circuit part is overheated. have.

Therefore, according to the embodiment of the present invention, it is possible to detect the instantaneous pressure rise of the internal filling gas due to the arc generated by an accident such as a short circuit, thereby enabling rapid discovery and recovery of the accident.

And, it is possible to set the rate of change of pressure and the sampling period with the button and can easily check the setting state for these with the naked eye to prevent operational convenience and malfunction due to misoperation.

In addition, since the operating temperature of the circuit unit can be sensed, it is possible to check a state in which the circuit operation cannot be normally performed due to an abnormal temperature environment.

In addition, since the temperature compensation algorithm corresponding to the gentle temperature change of the gas, the sensor for measuring the temperature of the gas, and a calibration procedure using the same are not required, the economical efficiency of the product can be secured.

Although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the present invention is not limited to the specific embodiments of the present invention without departing from the scope of the present invention as claimed in the claims. Various modifications are possible by those skilled in the art. In addition, matters that can be easily inferred from the appended drawings should be regarded as included in the content of the present invention even if they are not described in the detailed description, and various modifications will be separately understood from the technical spirit or the prospect of the present invention. Will not be.

10: pressure sensor 12: signal processing unit
14 controller 16 memory
20: button 22: temperature sensor
24: status display section 26: alarm signal output section

Claims (14)

A pressure sensor unit detecting a gas pressure inside the gas insulated switchgear;
An alarm signal output unit for outputting an alarm signal; And
The current pressure is measured using the pressure sensor unit a predetermined number of times for a predetermined sampling time at each sampling time point of a predetermined period, and the current is obtained by averaging the remainder except the maximum and minimum values of the pressure values measured during the sampling time at the sampling time point. Obtaining a current average value corresponding to a sampling time point and determining whether the current average value at the current sampling time point is outside a standard value of an allowable range based on a current reference value defined by averaging average values obtained for each sampling time point for a predetermined time period before the current time; In the instantaneous pressure rise detection switch of the gas insulated switchgear including a control unit for controlling the output of the alarm signal, the control unit,
If the current average value of the sampling time point does not deviate from the reference value of the allowable range based on the current reference value defined by averaging the average values obtained for each sampling time point for a predetermined time period before the present time, the sampling time point for a certain time including the present time The instantaneous pressure rise detection switch of the gas insulated switchgear for updating the current reference value by averaging the average value obtained every time.
delete The method of claim 1, wherein the control unit,
If the current average value at the current sampling time point is outside the standard value of the allowable range based on the current reference value defined by averaging average values obtained for each sampling time point for a predetermined time period before the present time, the pressure is applied for a predetermined number of times during the predetermined verification time. The current pressure is measured using a sensor unit, and the verification average value is obtained by averaging the pressure values except the maximum and minimum values of the pressure values measured during the verification time, and the verification average value is present at each sampling time point for a predetermined time before the present time. And a verification monitoring for determining whether a deviation from a reference value of an allowable range based on the current reference value, which is defined by averaging the average values, is performed before controlling the output of the alarm signal.
The method of claim 1,
A button unit used for setting at least one of the sampling time point and the allowable range; And
Further comprising a state display unit for distinguishing the setting state of at least one of the sampling time point and the allowable range,
And the control unit is configured to reset at least one of the sampling time point and the allowable range according to the setting of the button unit, and the reset state is displayed through the state display unit.
The method of claim 4, wherein the controller is further configured to perform an initialization process corresponding to power-on,
The initialization process reads the pressure value sequentially for a predetermined number of times during a predetermined initialization time, calculates an initial average value by averaging the remaining pressure values except the maximum value and the minimum value among the pressure values, and converts the initial average value to the current reference value. And setting at least one of the sampling time point and the allowable range according to the setting of the button unit.
The method of claim 4, wherein
The instantaneous pressure rise detection switch of the gas insulated switchgear is set at any one of 10msec, 30msec, 50msec or 100msec period.
The method of claim 4, wherein
The instantaneous pressure rise detection switch of the gas insulated switchgear is set to a value of any one of 0.05 bar, 0.1 bar, 0.3 bar or 1.0 bar.
The method of claim 1,
And a memory storing at least the current reference value, the sampling time point, and the allowable range and interfacing with the control unit.
The method of claim 1,
The control unit further includes a temperature sensor unit installed in the circuit unit forming the pressure sensor unit, the alarm signal output unit and the control unit, and when a signal corresponding to a temperature outside the preset operating temperature is transferred from the temperature sensor unit to the control unit, the control unit Instantaneous pressure rise detection switch of the gas insulated switchgear which performs the corresponding alarm control.
Measuring the current pressure by a predetermined number of times for a predetermined sampling time at each sampling time point of a predetermined period;
Obtaining a current average value corresponding to the current sampling time point by averaging the remainder except for the maximum value and the minimum value among the pressure values measured during the sampling time at the sampling time point;
Controlling the output of an alarm signal by determining whether the current average value at the current sampling time point falls outside a reference value of an allowable range based on a current reference value defined by averaging average values obtained for each sampling time point for a predetermined time period before the current time; And
If the current average value of the current sampling time point does not deviate from the reference value of the allowable range based on the current reference value defined by averaging the average value obtained for each sampling time point for a predetermined time period before the present time, the sampling time point for a certain time including the present time Updating the current reference value by averaging the average values obtained every time
Instantaneous pressure rise detection control method of the gas insulated switchgear comprising a.
delete The method of claim 10,
If the current average value of the sampling time point is out of an allowable range based on the current reference value defined by averaging the average values obtained for each sampling time point for a predetermined time period before the present time, further performing verification monitoring to output the alarm signal. Control,
The verification monitoring,
Measuring a current pressure using a pressure sensor unit for a predetermined number of times during a predetermined verification time;
Obtaining a verification average value by averaging the maximum and minimum values measured during the verification time; And
Determining the instantaneous pressure rise of the gas insulated switchgear comprising the step of determining whether the verification average value is outside the reference value of the allowable range based on the current reference value defined by averaging the average values obtained for each sampling time point for a predetermined time before the present time. Control method.
The method of claim 10,
Further performs the initialization process corresponding to the power-on,
The initialization process,
Reading out the pressure value sequentially a predetermined number of times during a predetermined initialization time;
Calculating an initial average value by averaging the remaining pressure values except for the maximum value and the minimum value among the pressure values;
Setting the initial average value to the current reference value; And
And resetting at least one of the sampling time point and the allowable range.
The method of claim 10,
When the temperature sensor unit installed in the pressure sensor unit, the alarm signal output unit and the control circuit unit detects a temperature outside the preset operating temperature, an instantaneous pressure increase detection control method of the gas insulated switchgear further performs the corresponding alarm control. .

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