JP2016226146A - Gas-insulation opening/closing device monitoring device, gas-insulation opening/closing device monitoring method, and gas-insulation opening/closing facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique for detecting abnormality in a gas-insulation opening/closing device with high accuracy.SOLUTION: A gas-insulation opening/closing device monitoring device is configured to detect abnormality of equipment in a gas insulation opening/closing device which includes a plurality of pressure containers and seals the equipment in one or more pressure containers, and has pressure acquisition means of acquiring gas pressure in the pressure containers, and determination means of determining that abnormality is occurring in the equipment in the pressure container whose gas pressure is higher than gas pressure in other pressure containers by a predetermined pressure difference threshold.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a technique for detecting a contact failure occurring inside a gas insulated switchgear.

The gas insulated switchgear is a sealed tank that encloses devices such as circuit breakers, disconnectors, busbars, lightning arresters, and instrument transformers with sulfur hexafluoride gas having high insulation performance. For example, it is used to connect a plurality of gas-insulated switchgears and seal wiring installed in a substation. By using a gas-insulated switchgear for wiring, the substation is downsized. The gas insulated switchgear is also referred to as “GIS” (GIS: Gas Insulated Switch). The sulfur hexafluoride gas is also referred to as “SF ₆ gas”.

  The GIS may enclose a switch including a movable part and a contact, such as a circuit breaker or a disconnector. The switch does not fit in the position where the contact is completely in contact, and has a high contact resistance when in contact with the switch. Abnormal heat generation may occur when a current flows through a portion with a high contact resistance. Abnormal heat generation due to this poor contact may melt the contacts and cause an accident due to a ground fault or a short circuit.

Patent Document 1 discloses a technique for detecting a contact failure. Patent Document 1 discloses a technique for detecting a contact failure based on a change ΔP in the pressure of SF ₆ gas (hereinafter also referred to as “gas pressure”) sealed inside and the amount of heat generated by the conductor.

JP 56-125908 A

  The technology disclosed in Patent Document 1 determines whether or not abnormal heat generation has occurred on the premise that all Joule heat due to the energizing current in a short time Δt is reflected in the energy that increases the gas pressure. However, in practice, Joule heat is also used to increase the temperature of equipment and wiring enclosed in the gas-insulated switchgear, so that it appears only partly as a change in gas pressure. Further, the method of Patent Document 1 is not suitable for a system where the change in current is small because the change ΔP in gas pressure is also small when the rate of change in current with respect to time is small.

  An object of the present invention is to provide a technique for detecting an abnormality in a gas insulated switchgear with high accuracy.

  A gas-insulated switchgear monitoring device according to an aspect of the present invention includes a plurality of pressure vessels, and the gas-insulated switchgear monitoring device detects an abnormality of the device in a gas-insulated switchgear that encloses a device in one or more pressure vessels. An abnormality has occurred in the pressure acquisition means for acquiring the gas pressure in the pressure vessel and the equipment inside the pressure vessel whose gas pressure is higher than the gas pressure of the other pressure vessel by a predetermined pressure difference threshold or more. Determining means.

  ADVANTAGE OF THE INVENTION According to this invention, abnormality of the apparatus in a gas insulated switchgear can be detected with high accuracy.

It is a block diagram which shows the schematic physical structure of the gas insulated switchgear installation by this embodiment. It is a figure which shows an example of the whole structure of the gas insulated switchgear 1. It is a figure which shows the cross section of a pressure vessel. It is a block diagram which shows the schematic function structure of the monitoring apparatus by this embodiment. It is a flowchart which shows operation | movement of the monitoring apparatus by this embodiment. It is a figure for demonstrating calculation processing of gas temperature and gas pressure. It is a figure for demonstrating a gas temperature characteristic. It is a graph which shows a time-dependent change of ₂₀ degreeC conversion gas pressure P20. It is a graph which shows the relationship between the electric current I and gas pressure difference (DELTA) P20 of 20 degreeC conversion. It is a figure for demonstrating the detailed process of the process in other embodiment. It is a figure which shows an example of measurement data.

  Embodiments of the present invention will be described in detail with reference to the drawings. In addition, embodiment mentioned later is an example, Comprising: Combination of embodiment, the combination of embodiment and a well-known or well-known technique, and a part of embodiment can be substituted by a well-known or well-known technique.

  FIG. 1 is a block diagram showing a schematic physical configuration of the gas insulated switchgear according to the present embodiment. Referring to FIG. 1, the gas-insulated switchgear according to this embodiment includes a gas-insulated switchgear 1 and a monitoring device 100 for the gas-insulated switchgear 1.

Gas-insulated switchgear 1 has a plurality of pressure vessels 2a~2c cylindrical encapsulating SF ₆ gas is set to linked structure. A conductor bus 5 passes through the central portion of these pressure vessels 2a to 2c in the coaxial direction. Not only the bus bar 5 but also the device 6 is sealed inside some of the pressure vessels 2a to 2c (the pressure vessel 2b in FIG. 1).

  The device 6 is an electric circuit having a switching device, that is, a contact as an example. There is a contact failure of the contact as an abnormality of the switchgear. Since contactlessness is a relatively serious abnormality that causes excessive heat generation, this contact failure is targeted for detection in this embodiment.

  FIG. 2 is a diagram illustrating an example of the overall configuration of the gas insulated switchgear 1. In the example of FIG. 2, many pressure vessels 2 from “001” to “0050” are connected in a complicated manner. When attention is paid to the pressure vessel 2 of “001”, the bus 5 penetrates through the inside thereof, and the device (switch) 6 is enclosed.

Returning to FIG. 1, the monitoring device 100 measures the pressure of the gas inside each pressure vessel 2 and the temperature for measuring the temperature of the surface of the pressure vessel 2 (hereinafter referred to as “tank temperature”). A sensor 4, a current sensor 7 for measuring a current flowing through the bus 5 (hereinafter referred to as “energization current”), an A / D converter 8 for converting an analog signal output from each sensor into a digital signal, The processing unit 10 connected by the D converter 8 and the communication line 9, the recording unit 11 for recording the measured data, the tank temperature T _tank , the energization current I, and the gas temperature T _gas estimated in advance by analysis. It has a gas temperature characteristic database 12 in which information representing the mutual relationship is recorded in advance, and a display unit 13 for displaying that an abnormality has occurred due to poor contact.

FIG. 3 is a view showing a cross section of the pressure vessel. The pressure vessel 2 has a structure in which SF ₆ gas 22 is sealed inside a cylindrical sheath 21. A bus bar 5 passes through the pressure vessel 2. The bus 5 is an electric wire through which an energization current I flows.

  FIG. 4 is a block diagram illustrating a schematic functional configuration of the monitoring apparatus according to the present embodiment. Referring to FIG. 4, the monitoring apparatus 100 includes a temperature acquisition unit 10A, a pressure acquisition unit 10B, and a determination unit 10C in addition to the pressure sensor 3, the temperature sensor 4, and the current sensor 7. The temperature acquisition unit 10A, the pressure acquisition unit 10B, and the determination unit 10C correspond to the processing unit 10 in FIG.

  The pressure acquisition unit 10B acquires the gas pressure in the pressure vessel 2. The determination unit 10C determines that an abnormality has occurred in the device 6 inside the pressure vessel 2 whose gas pressure is higher than the gas pressure of the other pressure vessel 2 by a predetermined pressure difference threshold or more. As a result, the abnormality of the device 6 in the pressure vessel 2 is detected based on the comparison between the difference in gas pressure among the plurality of pressure vessels 2 and an appropriate pressure threshold, so that the heat generated by the abnormality of the device 6 increases the gas pressure. Regardless of how much is consumed and how much the current changes with time, an abnormality of the device 6 can be detected with high accuracy.

  Further, the determination unit 10C determines in advance whether or not gas is leaking from the pressure vessel 2 based on the acquired gas pressure, and determines whether or not an abnormality has occurred in the device 6 with respect to the pressure vessel 2 in which no gas leaks. To do. Since the gas pressure is reduced in the pressure vessel 2 in which gas is leaking, the abnormality of the device 6 cannot be normally detected due to the difference in gas pressure with other pressure vessels 2. Therefore, by excluding such a pressure vessel 2 from an abnormality detection target of the device 6, it is possible to detect the abnormality of the device 6 with high accuracy.

  In addition, the determination unit 10 </ b> C determines whether there is an abnormality in the device 6 in the pressure vessel 2 based on the difference in gas pressure between the adjacent pressure vessels 2. Thereby, since abnormality of the apparatus 6 is detected by the difference in the gas pressure inside the pressure vessels 2 placed in a similar external environment, the abnormality of the apparatus 6 can be detected with high accuracy.

  Further, the determination unit 10C calculates the difference between the gas pressure of the determination target pressure vessel 2 and the gas pressure of the two pressure vessels 2 adjacent to the determination target pressure vessel 2, and the value of the difference between the two is the pressure. If it is equal to or greater than the difference threshold, it is determined that an abnormality has occurred in the device 6 in the pressure vessel 2 to be determined. As a result, it is determined that there is an abnormality in the device 6 in the pressure vessel 2 in which the difference in gas pressure between the adjacent pressure vessels 2 in the near environment is equal to or greater than the pressure difference threshold, so the abnormality in the device 6 is detected with higher accuracy. can do.

  Further, the monitoring apparatus 100 according to the present embodiment will be described in detail.

  FIG. 5 is a flowchart showing the operation of the monitoring apparatus according to the present embodiment.

  The monitoring device 100 is configured to supply the gas pressure measured by the pressure sensor 3, the tank temperature of the pressure vessel 2 measured by the temperature sensor 4, and the conductor (bus) 5 measured by the current sensor 7 in a predetermined cycle. Current is collected (step S1). Analog output signals from the pressure sensor 3, the temperature sensor 4, and the current sensor 7 are converted into digital signals indicating the detected values by the A / D converter 8 and input to the processing unit 10. The processing unit 10 stores each detection value indicated by the digital signal in the recording unit 11.

FIG. 6 is a diagram for explaining the calculation processing of the gas temperature and the gas pressure. As shown in FIG. 6, next, the monitoring apparatus 100 calculates a primary estimated gas temperature T _gas0 that is a primary estimated value of the gas temperature based on the tank temperature T _tank and the energization current I by the temperature acquisition unit 10A. (Step S2). At that time, the temperature acquisition unit 10 </ b> A refers to the gas temperature characteristic database 12.

The gas temperature characteristic database 12 stores gas temperature characteristic data calculated in advance by numerical analysis in consideration of the dimensions of the pressure vessel and the like. The gas temperature characteristic shows the correlation between the tank temperature T _tank and the primary estimated gas temperature T _gas0 with the current I as a parameter. As the primary estimated gas temperature T _gas0 , an estimated value of the gas temperature in a steady state where the current I and the tank temperature T _tank are stable is used.

FIG. 7 is a diagram for explaining the gas temperature characteristics. FIG. 7A shows a graph of the correlation between the tank temperature T _tank and the primary estimated gas temperature T _{gas0 using} the current I as a parameter.

Here, as an example, it is assumed that the measured tank temperature T _tank is T ′ [° C.] and the energization current I is I ′ [kA]. As shown in FIG. 7B, it is assumed that the current I ′ is larger than the current I1 and smaller than the current I2. The temperature acquisition unit 10A assumes that the tank temperature T _tank is a quadratic curve of the energization current I, interpolates between the currents I ₁ and I ₂ , and performs a primary estimation corresponding to the current I ′ based on the quadratic curve. The gas temperature T _gas0 (T ′, I ′) is calculated.

  The reason why the quadratic curve is used here is that the amount of heat generated by the current of the bus 5 is logically proportional to the square of the current. However, if the correlation between the tank temperature and the gas temperature can be collected as measured values for each current value at sufficiently fine intervals in advance, interpolation by linear approximation may be performed.

In addition, when a current I ′ larger than the maximum value of the current I assumed in advance is measured, the temperature acquisition unit 10A may calculate the primary estimated gas temperature T _gas0 by extrapolation.

As described above, the primary estimated gas temperature T _gas0 can be obtained from the current I and the tank temperature T _tank .

Furthermore, the temperature acquisition unit 10A calculates the gas temperature T _gas used for the gas pressure calculation process by filtering the primary estimated gas temperature T _gas0 accumulated in time series.

Next, the monitoring apparatus 100 calculates the gas temperature T _gas considering the transient temperature transition by filtering the primary estimated gas temperature T _gas0 by the temperature acquisition unit 10A (step S3). Here, as an example of the filtering process, a moving average calculation using history data of the primary estimated gas temperature T _gas0 is shown. When the time constant of the system is τ, the average value of the primary estimated gas temperatures T _gas0 (i) (i = 1, 2,..., N) of the past gas temperatures calculated at the time τ is calculated.

In the formula (1), N = (time constant τ) / (calculation cycle). That is, the time for taking the moving average may be determined based on the time constant of the system. Here, an example in which the average of the primary estimated gas temperature T _gas0 within the range of the time constant τ is shown, but the time range in which the moving average is taken is not limited to this. A moving average up to about three times the time constant τ may be taken.

  Assuming that the bus 5 and the sheath 21 are coaxially and infinitely extending as shown in FIG. 3, and the induction and radiation are ignored, the unsteady heat transfer equations of the bus 5, the gas 22, and the sheath 21 are respectively It represents with Formula (2) (3) (4).

  In addition, the time constants of the bus 5, the gas 22, and the sheath 21 are expressed by equations (5), (6), and (7), respectively. In this embodiment, as an example, the maximum time constant of the bus 5, the time constant of the gas 22, and the time constant of the sheath 21 is used as the time constant of the entire system.

Symbols and subscripts in the above formulas are as follows.
<Symbol>
T temperature [K]
ρ density [kg / m ³ ]
c Specific heat [J / kg ・ K]
V volume [m ³ ]
h Heat transfer coefficient [W / (m ² K)]
S area [m ² ]
t time [s]
I Current [kA]
<Subscript>
a conductor
g gas
th sheath
b Sheath inner surface
c Sheath outer surface ∞ Outside air

Next, the monitoring device 100 calculates the molar volume v [m ³ / mol] of the SF ₆ gas in each pressure vessel 2 by the pressure acquisition unit 10B (step S4). At this time, the pressure acquisition unit 10B calculates the molar volume v of SF ₆ gas by solving the Beattie-Bridgeman state equation for each pressure vessel 2.

A = 1.578
B = 0.1062 × 10 ^-3
C = 0.366 × 10 ^-3
D = 0.1236 × 10 ^-3
R = 8.3143 J / (mol ・ K)

Subsequently, the pressure acquisition unit 10B calculates a gas pressure converted to a predetermined reference temperature (step S5). Here, the reference temperature is 20 ° C. as an example. The pressure acquisition unit 10B calculates a gas pressure _{P 20} in terms of a reference temperature of 20 ° C. using equation (11).

The monitoring device 100 stores the measured or calculated current I, the tank temperature T _tank , the primary estimated gas temperature T _gas0 , the gas temperature T _gas , and the 20 ° C. converted gas pressure P ₂₀ with a time stamp and stores them in the recording unit 11.

The monitoring device 100 extracts, as a representative value for one day, data having a time stamp of a predetermined time of night out of the 20 ° C. converted gas pressure P ₂₀ accumulated in the recording unit 11 by the determination unit 10C. A slope a and an intercept b of the regression curve P20 = a × t + b based on the values are calculated (step S6).

Figure 8 is a graph showing a time course of 20 ° C. Conversion gas pressure P _20. In the graph of FIG. 8, the horizontal axis represents time [year], and the vertical axis represents 20 ° C. converted gas pressure P20. If there is no gas leakage, the molar volume is basically constant. Therefore, when the temperature is converted to a constant value, the gas pressure is also basically constant. In the pressure vessel 2 gas leak occurs, a decrease in the 20 ° C. converted gas pressure P ₂₀ is increased. The reason why the nighttime data is used is that the determination is made with data with less error that is not easily affected by the difference in the amount of solar radiation for each day.

The determination unit 10C determines whether or not the slope ((a / b) × 100 [%]) with respect to the intercept b for each pressure vessel 2 is smaller than a threshold value (−0.5% / year) (step) S7). If the slope ((a / b) × 100 [%]) is smaller than the threshold (−0.5% / year), the determination unit 10C determines that SF ₆ gas is leaking from the pressure vessel 2, An alarm is displayed on the display unit 13 (step S8).

  On the other hand, if the slope ((a / b) × 100 [%]) is equal to or greater than the threshold (−0.5% / year), the determination unit 10C determines that no gas leak has occurred in the pressure vessel 2. The gas pressures in the pressure vessels 2 in all the sections are acquired (step S9).

  After step S9, the determination unit 10C calculates a difference ΔP between the gas pressure of the pressure vessel 2 (determination target) including the device 6 therein and the gas pressure of the other pressure vessel 2 (step S10). Subsequently, the determination unit 10C determines whether or not the gas pressure difference ΔP is greater than or equal to the threshold value Pth (step S11).

  In the pressure vessel 2 in which a contact failure occurs in the internal device 6, the resistance value of the bus 5 increases due to the contact failure, but other conditions are assumed to be the same between the pressure vessels 2. Assuming an ideal gas, PV = nRT is established. Therefore, a pressure difference ΔP corresponding to the temperature difference ΔT depending on the difference in resistance of the bus 5 between the pressure vessels 2 is generated between the pressure vessels 2. Since ΔP is proportional to the temperature difference ΔT, when contact failure occurs in the switch and the contact resistance of the contact increases, Joule heat increases in proportion to the increased resistance value, and the pressure difference ΔP increases.

Therefore, the monitoring device 100 uses the pressure vessel 2 in which the device 6 such as a switch is present as an object to be determined, and the 20 ° C. converted gas pressure P ₂₀ and 20 ° C. of the other pressure vessel 2 through which the same current flows. A difference ΔP20 = P20−P20b from the converted gas pressure P20b is calculated and compared with the threshold value Pth.

  FIG. 9 is a graph showing the relationship between the energization current I and the gas pressure difference ΔP20 in terms of 20 ° C. The threshold value Pth is a linear function of the energization current I. If there is no abnormality in the device 6, the gas pressure difference ΔP20 does not exceed the threshold value Pth. On the other hand, if there is an abnormality in the device 6, the gas pressure difference ΔP20 exceeds the threshold value Pth.

  If the gas pressure difference ΔP is equal to or greater than the threshold value Pth, the determination unit 10C determines that an abnormality due to contact failure has occurred in the device 6 in the pressure vessel 2 to be determined, and displays an alarm on the display unit 13. (Step S12). On the other hand, if the gas pressure difference ΔP is not greater than or equal to the threshold value Pth, the monitoring device 100 returns to step S1 and continues monitoring.

  FIG. 2 shows a display example when the determination unit 10 </ b> C detects an abnormality and displays an alarm on the display unit 13. In the example of FIG. 2, all the pressure vessels 2 of the gas insulated switchgear 1 and numbers uniquely assigned to the respective pressure vessels 2 are illustrated. In the example of FIG. 2, an abnormality is detected in the pressure vessel “013”, and the display unit 13 shows a state where the portion where the abnormality has occurred is highlighted by blink display or the like.

As described above, the threshold value Pth of the 20 ° C. converted gas pressure difference ΔP ₂₀ in the present embodiment is expressed as a function of the energization current I. The determination unit 10C determines the gas pressure difference ΔP ₂₀ and the conduction current I measured by the current sensor 7 when the gas pressure P used to calculate the gas pressure difference ΔP ₂₀ is measured by the pressure sensor 3. And the pressure difference threshold value Pth calculated from the function is compared. Thereby, since the pressure difference threshold value Pth according to the value of the energizing current I can be used, it is possible to detect an abnormality of the device with high accuracy even in a system in which the energizing current I changes.

  Further, as described above, in the present embodiment, the pressure acquisition unit 10B uses the gas temperature acquired by the temperature acquisition unit 10A based on the gas pressure P measured by the pressure sensor 3 as a predetermined reference gas temperature (20 ° C. The gas pressure P20 converted to) is calculated. Then, the determination unit 10C compares the converted gas pressure difference ΔP20 with the pressure difference threshold value Pth. Thereby, the error due to the fluctuation of the gas pressure P due to the gas temperature T can be removed, and the calculation can be performed based on the gas pressure with high accuracy.

  In the present embodiment, an example is shown in which abnormality detection is performed by comparing the 20 ° C. converted gas pressure difference ΔP20 with the threshold value Pth. However, the present invention is not limited to this, and other methods are used to detect abnormality. May be. In another example, the monitoring device 100 calculates the value of the 20 ° C. converted gas pressure difference ΔP20 with respect to the energized current I, and, as shown in FIG. Plot on a graph with the vertical axis. And the monitoring apparatus 100 calculates | requires inclination K1 and intercept K2 by the least square method by making a regression curve into (DELTA) P20 = K1 * I + K2. Furthermore, the monitoring apparatus 100 determines whether or not the inclination K1 is equal to or greater than a predetermined inclination threshold value Kg. Display on the unit 13.

  Next, another embodiment will be described.

  FIG. 10 is a diagram for explaining detailed processing of processing according to another embodiment.

The pressure acquisition unit 10B calculates the molar volume v of the gas in the pressure vessel 2 based on the gas temperature T _gas acquired by the temperature acquisition unit 10A and the gas pressure P acquired by the pressure acquisition unit 10B itself, Based on the molar volume v, a 20 ° C. converted gas pressure P ₂₀ , which is a gas pressure converted from the gas temperature T _gas to the reference gas temperature (20 ° C.), is calculated. Further, the temperature acquisition unit 10A corrects the gas temperature T _gas that is input to the pressure acquisition unit 10B, using the correction coefficient calculated based on the molar volume v. According to this, since the gas pressure converted to the reference gas temperature is calculated using the gas temperature T _gas corrected by feeding back the fluctuation of the molar volume, the accuracy of the gas pressure is increased by the correction based on the actual measurement result, The accuracy of the abnormality detection of the device 6 can be increased.

  This will be described in more detail below.

The temperature acquisition unit 10A calculates the primary estimated gas temperature T _gas0 based on the measured tank temperature T _tank and the current I by the same method as described with _reference to FIG. 10 is different from FIG. 6 in that the temperature acquisition unit 10A calculates the gas temperature T _gas by correcting the primary estimated gas temperature T _gas0 based on actual measurement instead of filter processing. The temperature acquisition unit 10A calculates the correction value ΔT = ΔT (i) (i = 1,..., N) of the gas temperature using the equation (12), and subtracts the correction value ΔT from the primary estimated gas temperature _Tgas0. Thus, the corrected gas temperature T _gas is calculated.

Temperature acquisition unit 10A, a proportional constant K of formula (12), the initial value _{K0 = K I (0) =} ··· K I (M) = K T (0) = ··· K T (M) = The accuracy is improved by correcting the feedback by a predetermined period of zero. For example, after determining the proportionality constant K over a predetermined period of one year, the temperature acquisition unit 10A operates with the proportionality constant K fixed.

  Hereinafter, a description will be given of a method of determining by correcting by feedback of the proportionality constant K.

First, the temperature acquisition unit 10A acquires the data of the molar volumes v (1),..., V (N) for the past N days excluding today from the recording unit 11. FIG. 11 is a diagram illustrating an example of actual measurement data. In FIG. 11, the past tank temperature T _tank and current I within a predetermined time (3 hours) from the current time (16:00) are surrounded by a thick line. The molar volume v (1),..., V (N) is a value calculated based on the actual measurement data surrounded by the bold line.

Next, the temperature acquisition unit 10A calculates an average value v ₀ of the acquired molar volumes v (1),..., V (N), and regards this as the true value of the molar volume. As described above in the description of FIG. 8, if there is no gas leakage, the molar volume is basically constant, so this average value v ₀ can be regarded as a true value.

  Next, the temperature acquisition unit 10A calculates errors of the acquired past molar volumes v (1),..., V (N). The equation for calculating the molar volume error is equation (13).

  Subsequently, the temperature acquisition unit 10A calculates a proportionality constant K (T, v, P) with respect to the gas temperature estimation error ΔT (i) of the molar volume error Δv (i) by Equation (14).

^{((C + 2v) RT-} A-3Pv 2) / (CD-vC-v 2) R moiety of formula (14) is K. Then, the temperature acquisition unit 10A acquires the current I and the tank temperature T _tank for the past N days from the recording unit 11, and based on the equation (15), the correction value ΔK = (ΔK ₀ , ΔK _I (0) ,..., ΔK _I (M), ΔK _T (0),..., ΔK _T (M)) are calculated.

  The above-described embodiments of the present invention are examples for explaining the present invention, and are not intended to limit the scope of the present invention only to those embodiments. Those skilled in the art can implement the present invention in various other modes without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Gas insulation switchgear, 10 ... Processing part, 100 ... Monitoring apparatus, 10A ... Temperature acquisition part, 10B ... Pressure acquisition part, 10C ... Determination part, 11 ... Recording part, 12 ... Gas temperature characteristic database, 13 ... Display part DESCRIPTION OF SYMBOLS 2 ... Pressure vessel, 21 ... Sheath, 22 ... Gas, 2a ... Pressure vessel, 2b ... Pressure vessel, 3 ... Pressure sensor, 4 ... Temperature sensor, 5 ... Conductor (bus), 6 ... Apparatus, 7 ... Current sensor, 9 ... communication line

Claims (15)

A gas-insulated switchgear monitoring device that detects an abnormality of the device in a gas-insulated switchgear that includes a plurality of pressure vessels and encloses the device in one or more pressure vessels,
Pressure acquisition means for acquiring a gas pressure in the pressure vessel;
A determination means for determining that an abnormality has occurred in a device inside the pressure vessel whose gas pressure is higher than a gas pressure of another pressure vessel by a predetermined pressure difference threshold or more;
A gas insulated switchgear monitoring device.   The determination means determines in advance whether or not gas is leaking from the pressure vessel based on the acquired gas pressure, and determines whether or not an abnormality has occurred in the device with respect to the pressure vessel that does not leak gas, The gas insulated switchgear monitoring device according to claim 1.   The gas insulated switchgear monitoring device according to claim 1, wherein the determination unit determines whether there is an abnormality in the device in the pressure vessel based on a difference in gas pressure between adjacent pressure vessels.   The determination means calculates the difference between the gas pressure of the pressure vessel to be determined and the gas pressure of two pressure vessels adjacent to the pressure vessel to be determined, and the difference value of both is the pressure difference threshold value. The gas insulated switchgear monitoring device according to claim 3, wherein if it is above, it is determined that an abnormality has occurred in the device in the determination target pressure vessel. A pressure sensor for measuring the gas pressure inside the pressure vessel;
A current sensor that measures an energization current flowing through a bus passing through the plurality of pressure vessels, and
The pressure difference threshold is expressed as a function of energization current,
The determination means uses the difference between the gas pressures and the energization current measured by the current sensor when the gas pressure used to calculate the gas pressure difference is measured by the pressure sensor. Comparing the pressure difference threshold value calculated from the function,
The gas insulated switchgear monitoring device according to claim 1. A temperature acquisition means for acquiring a gas temperature in the pressure vessel;
The pressure acquisition means calculates a gas pressure obtained by converting the gas temperature acquired by the temperature acquisition means into a predetermined reference gas temperature based on the gas pressure measured by the pressure sensor;
The determination means compares the difference in gas pressure after conversion with the pressure difference threshold value.
The gas insulated switchgear monitoring device according to claim 5. A temperature sensor for measuring a tank temperature on the surface of the pressure vessel;
The temperature acquisition means calculates the gas temperature based on the tank temperature and the energization current.
The gas insulated switchgear monitoring device according to claim 6. The pressure acquisition means calculates the molar volume of the gas in the pressure vessel based on the gas temperature acquired by the temperature acquisition means and the gas pressure acquired by the pressure acquisition means itself, and the molar volume And calculating the gas pressure obtained by converting the gas temperature into the reference gas temperature,
The temperature acquisition means corrects the gas temperature using a correction coefficient calculated based on the molar volume.
The gas insulated switchgear monitoring device according to claim 6. The device is an electrical circuit having contacts;
The abnormality of the device is a contact failure at the contact point,
The gas insulated switchgear monitoring device according to claim 1. A gas insulated switchgear monitoring method for detecting an abnormality of the device in a gas insulated switchgear comprising a plurality of pressure vessels and enclosing the device in one or more pressure vessels,
A pressure acquisition means acquires a gas pressure in the pressure vessel;
The determination means determines that an abnormality has occurred in the equipment inside the pressure vessel where the gas pressure is higher than the gas pressure of the other pressure vessel by a predetermined pressure difference threshold or more,
Gas insulated switchgear monitoring method.   The determination means determines in advance whether or not gas is leaking from the pressure vessel based on the acquired gas pressure, and determines whether or not an abnormality has occurred in the device with respect to the pressure vessel that does not leak gas, The gas insulated switchgear monitoring method according to claim 10.   The gas insulated switchgear monitoring method according to claim 10, wherein the determination unit determines whether there is an abnormality in the device in the pressure vessel based on a difference in gas pressure between adjacent pressure vessels. A gas insulated switchgear comprising a plurality of pressure vessels and enclosing the equipment in one or more pressure vessels;
A monitoring device that acquires the gas pressure in the pressure vessel and determines that an abnormality has occurred in the equipment inside the pressure vessel that is higher than a gas pressure of another pressure vessel by a predetermined pressure difference threshold value or more,
Gas-insulated switchgear with   The monitoring device determines in advance whether or not gas leaks from the pressure vessel based on the acquired gas pressure, and determines whether or not an abnormality has occurred in the device with respect to the pressure vessel in which no gas leaks, The gas insulated switchgear according to claim 13.   The gas insulated switchgear according to claim 13, wherein the monitoring device determines the presence or absence of abnormality of the device in the pressure vessel based on a difference in gas pressure between adjacent pressure vessels.

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