JP6521744B2 - Gas-insulated switchgear monitoring apparatus, gas-insulated switchgear monitoring method, and gas-insulated switchgear - Google Patents

Description

  The present invention relates to a technology for detecting a contact failure that occurs inside a gas-insulated switchgear.

The gas-insulated switchgear is a sealed tank that encloses devices such as a circuit breaker, a disconnector, a bus bar, a lightning arrester, a meter transformer, etc. with sulfur hexafluoride gas having high insulation performance. For example, it is used to connect a plurality of gas-insulated switchgears and to seal the wiring installed in the substation. By using gas-insulated switchgear for wiring, miniaturization of the substation has been realized. The gas insulated switchgear is also called "GIS" (GIS: Gas Insulated Switch). Further, sulfur hexafluoride gas is also referred to as "SF ₆ gas".

  The GIS may internally enclose switches, including moveable parts and contacts, such as circuit breakers or disconnectors. The switch will have high contact resistance when it does not fit in the position where the contacts are in full contact and it is in an incomplete contact state. Abnormal heating may occur if current flows in the area with high contact resistance. The abnormal heat generation due to the contact failure may melt the contact 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 from a change ΔP of pressure (hereinafter also referred to as “gas pressure”) of SF ₆ gas enclosed inside and a calorific value of a conductor.

Japanese Patent Application Laid-Open No. 56-125908

  The technique disclosed in Patent Document 1 determines whether or not abnormal heat generation occurs on the premise that all Joule heat by current flow in a short time Δt is reflected in energy that raises the gas pressure. However, in practice, Joule heat is also used to raise the temperature of the equipment and wiring enclosed in the gas-insulated switchgear, and therefore, it appears as a change in gas pressure. Further, in the method of Patent Document 1, when the rate of change in current with respect to time is small, the change in gas pressure ΔP is also small, so this method is unsuitable for a system in which the change in current is originally 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 apparatus according to an aspect of the present invention includes a plurality of pressure vessels and seals equipment in one or more pressure vessels. An abnormality occurs in the pressure acquiring 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 vessels by a predetermined pressure difference threshold or more. And determining means for determining that

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

It is a block diagram showing a schematic physical configuration of gas insulated switching equipment by this embodiment. FIG. 1 is a view showing an example of the entire configuration of a gas-insulated switchgear 1. It is a figure which shows the cross section of a pressure vessel. It is a block diagram showing a schematic functional configuration of a monitoring device according to the present 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 showing a time course of 20 ° C. Conversion gas pressure P _20. It is a graph which shows the relationship between electricity supply current I and gas pressure difference deltaP20 of 20 ° C 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. The embodiments to be described later are merely examples, and combinations of the embodiments, combinations of the embodiments and known or known techniques, and some of the embodiments can be replaced by known or known techniques.

  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 the present embodiment includes a gas-insulated switchgear 1 and a monitoring device 100 thereof.

The gas-insulated switchgear 1 has a structure in which a plurality of cylindrical pressure vessels 2a to 2c in which SF ₆ gas is sealed are connected. In the center of these pressure vessels 2a to 2c, a bus bar 5 of a conductor penetrates in the coaxial direction. Not only the bus bar 5 but also the device 6 is enclosed 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 switchgear, that is, a contact, as an example. There is contact failure of the contact as an abnormality of the switchgear. Since the non-contact is a relatively serious abnormality that causes excessive heat generation, in the present embodiment, this contact failure is targeted for detection.

  FIG. 2 is a view showing an example of the entire configuration of the gas-insulated switchgear 1. As shown in FIG. In the example of FIG. 2, a large number of pressure vessels 2 from “001” to “0050” are connected in a complicated manner. Focusing on the pressure vessel 2 of "001", the bus bar 5 penetrates through the pressure vessel 2 and the device (switch) 6 is enclosed.

Returning to FIG. 1, the monitoring device 100 measures a pressure sensor 3 that measures the pressure of the gas inside each pressure vessel 2 and a temperature for measuring the surface temperature of the pressure vessel 2 (hereinafter referred to as “tank temperature”) A sensor 4, a current sensor 7 for measuring a current (hereinafter referred to as “energized current”) flowing through the bus 5, an A / D converter 8 for converting an analog signal output from each sensor into a digital signal, A / D The processing unit 10 connected by the D converter 8 and the communication line 9, the recording unit 11 for recording the measured data, and the tank temperature T _tank , the conduction current I, and the gas temperature T _gas estimated by analysis in advance It has a gas temperature characteristic database 12 in which information representing the mutual relationship is recorded in advance, and a display unit 13 which displays that an abnormality due to a contact failure has occurred.

FIG. 3 is a view showing a cross section of the pressure vessel. The pressure vessel 2 has a structure in which an SF ₆ gas 22 is enclosed in a tubular sheath 21. A bus bar 5 penetrates into the pressure vessel 2. The bus bar 5 is a wire through which the current I flows.

  FIG. 4 is a block diagram showing a schematic functional configuration of the monitoring device according to the present embodiment. Referring to FIG. 4, the monitoring device 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 10 </ b> B acquires the gas pressure in the pressure vessel 2. The determination unit 10C determines that an abnormality occurs in the device 6 inside the pressure vessel 2 in which the gas pressure is higher than the gas pressure of the other pressure vessels 2 by a predetermined pressure difference threshold or more. Thereby, since the abnormality of the apparatus 6 in the pressure vessel 2 is detected based on the difference between the gas pressure of the plurality of pressure vessels 2 and the appropriate pressure threshold, the heat generation due to the abnormality of the apparatus 6 causes the gas pressure to rise. Irrespective of how much time is spent, and how much the current changes with time, etc., it is possible to detect an abnormality of the device 6 with high accuracy.

  Further, the determination unit 10C determines in advance whether gas leaks from the pressure vessel 2 based on the acquired gas pressure, and determines whether or not an abnormality occurs in the device 6 for the pressure vessel 2 in which the gas does not leak. Do. Since the gas pressure of the pressure vessel 2 in which the gas is leaking decreases, the difference in gas pressure with the other pressure vessels 2 can not normally detect an abnormality of the device 6. Therefore, by excluding such a pressure vessel 2 from the target of abnormality detection of the device 6, it is possible to detect an abnormality of the device 6 with high accuracy.

  Further, the determination unit 10C determines the presence or absence of abnormality of the device 6 in the pressure vessel 2 based on the difference in gas pressure between the adjacent pressure vessels 2. Thereby, since the abnormality of the apparatus 6 is detected based on the difference in the gas pressure inside the pressure vessels 2 placed in similar external environments, the abnormality of the apparatus 6 can be detected with high accuracy.

  Furthermore, the determination unit 10C calculates the difference between the gas pressure of the pressure container 2 to be determined and the gas pressure of the two pressure containers 2 on both sides of the pressure container 2 to be determined. If it is more than a difference threshold value, it will be judged that abnormalities have occurred in apparatus 6 in pressure vessel 2 of judgment object. As a result, it is determined that the equipment 6 in the pressure vessel 2 has a difference between the gas pressure with both adjacent pressure vessels 2 in the near environment, both of which are equal to or larger than the pressure difference threshold. can do.

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

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

  The monitoring apparatus 100 supplies 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 energization of the conductor (bus) 5 measured by the current sensor 7 at a predetermined cycle. The 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 detected values by the A / D converter 8 and are 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 calculation processing of gas temperature and gas pressure. As also shown in FIG. 6, next, the monitoring device 100 calculates a primary estimated gas temperature T _gas0 , which is a primary estimated value of the gas temperature, based on the tank temperature T _tank and the energizing current I by the temperature acquisition unit 10A. (Step S2). At that time, the temperature acquisition unit 10A refers to the gas temperature characteristic database 12.

The gas temperature characteristic database 12 previously stores data of the gas temperature characteristic calculated by numerical analysis in consideration of the dimensions of the pressure vessel and the like. Gas temperature characteristic shows the correlation between the tank temperature T _tank and the primary estimated gas temperature T _Gas0 that the current I and parameters. As the primary estimated gas temperature T _gas0 , an estimated value of the gas temperature in a steady state in which the current I and the tank temperature T _tank are stable is used.

FIG. 7 is a diagram for explaining gas temperature characteristics. In FIG. 7 (a), a graph of correlation between the tank temperature _{T tank} and the primary estimated gas temperature _{T Gas0} that the current I as a parameter is shown.

Here, as an example, it is assumed that the measured tank temperature T _tank is T ′ [° C.] and the conduction 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. Temperature acquisition unit 10A, interpolates between current I ₁ and the current I ₂ assumes a tank temperature T _tank and the secondary curve of the energizing current I, based on the quadratic curve, corresponding primary estimated current I ' The gas temperature T _gas0 (T ', I') is calculated.

  Note that the reason for interpolating with a quadratic curve here is that, theoretically, the amount of heat generated by the current of the bus 5 is proportional to the square of the current. However, if the correlation between the tank temperature and the gas temperature can be collected as an actual measurement value for each current value with sufficiently fine intervals, interpolation by linear approximation may be performed in advance.

Further, 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, may be from the current I and the tank temperature _{T tank} obtain primary estimated gas temperature _{T gas0.}

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 device 100 performs the filtering process on the primary estimated gas temperature T _gas0 by the temperature acquisition unit 10A to calculate the gas temperature T _gas in consideration of a transient temperature transition (step S3). Here, moving average calculation using history data of the primary estimated gas temperature T _gas0 is shown as an example of the filtering process. _Assuming that the time constant of the system is τ, an average value of the primary estimated gas temperature T _gas0 (i) (i = 1, 2,..., N) of the past gas temperature calculated at time τ is calculated.

In equation (1), N = (time constant τ) / (arithmetic cycle). That is, the time to take moving average may be determined based on the time constant of the system. Although the example which takes the average of primary estimated gas temperature _Tgas0 in the range of time constant (tau) was shown here, the time range which takes a moving average 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 coaxial and extend infinitely as shown in FIG. 3, assuming that induction and radiation are neglected, the unsteady heat transfer equations of the bus 5, the gas 22 and the sheath 21 are respectively Formula (2) (3) (4) represents.

  Further, the time constants of the bus 5, the gas 22, and the sheath 21 are expressed by the equations (5), (6), and (7), respectively. In the present embodiment, as an example, the largest one of the 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.

The symbols in the above formulas and their subscripts 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 Inner surface of sheath
c Sheath outer surface 外 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 the SF ₆ gas by solving the Beattie-Bridgeman equation of state for each pressure vessel 2.

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

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

Monitoring device 100, the measurement or the calculated current I, tank temperature _{T tank,} primary estimated gas temperature _{T Gas0,} it is stored in the recording unit 11 with the time stamp on the gas temperature _T gas, 20 ° C. converted gas pressure _{P 20.}

The monitoring apparatus 100 extracts the data with the time stamp of the predetermined time of night among the 20 ° C. converted gas pressure P ₂₀ accumulated in the recording unit 11 by the determination unit 10 C as a representative value of one day, and the representative thereof The slope a and the intercept b of the regression curve P20 = a × t + b according to the value are calculated (step S6).

FIG. 8 is a graph showing the time-dependent change of the 20 ° C. converted gas pressure P ₂₀ . In the graph of FIG. 8, the horizontal axis represents time [years], and the vertical axis represents a 20 ° C. converted gas pressure P20. If there is no gas leak, the molar volume is basically constant, so if the temperature is converted to a constant, the gas pressure is also basically constant. In the pressure vessel 2 in which the gas leak has occurred, the decrease of the 20 ° C. converted gas pressure P ₂₀ becomes large. The nighttime data is used because the judgment is made using data with less error, which is less susceptible to differences in daily solar radiation.

The determination unit 10C determines whether or not the inclination ((a / b) × 100 [%]) based on the section b for each pressure vessel 2 is smaller than the threshold (−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 the 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 higher than the threshold (−0.5% / year), the determination unit 10C determines that no gas leak has occurred in the pressure vessel 2 The gas pressure of the pressure vessel 2 of all the compartments is acquired (step S9).

  Then, after step S9, the determination unit 10C calculates the 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 vessels 2 (step S10). Subsequently, the determination unit 10C determines whether the gas pressure difference ΔP is equal to or larger than the threshold Pth (step S11).

  In the pressure vessel 2 in which the contact failure occurs in the internal device 6, the resistance value of the bus bar 5 increases due to the contact failure, but the other conditions are assumed to be the same among the pressure vessels 2. Assuming that the ideal gas is PV = nRT, 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 determines the pressure vessel 2 in which the device 6 such as a switch exists inside as a determination target, and the 20 ° C. converted gas pressure P ₂₀ and the other 20 ° C. The 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 supplied current I and the gas pressure difference ΔP20 in 20 ° C. conversion. The threshold Pth is a linear function of the conduction current I. If there is no abnormality in the device 6, the gas pressure difference ΔP20 does not exceed the threshold 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 more than the threshold value Pth, the determination unit 10C determines that an abnormality due to a contact failure has occurred in the device 6 in the pressure container 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 the threshold Pth or more, the monitoring device 100 returns to step S1 and continues monitoring.

  FIG. 2 shows a display example when the determination unit 10C 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, a state in which an abnormality is detected in the pressure vessel “013”, and a portion in which the abnormality has occurred is highlighted in a blink display or the like on the display unit 13 is shown.

As described above, the threshold Pth of the 20 ° C. converted gas pressure difference ΔP ₂₀ in the present embodiment is expressed as a function of the energizing current I. The determination unit 10C determines the gas pressure difference ΔP ₂₀ and the 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. The pressure difference threshold Pth calculated from the function is used to compare with. As a result, since the pressure difference threshold value Pth corresponding to the value of the 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 current I changes.

  Further, as described above, in the present embodiment, based on the gas pressure P measured by the pressure sensor 3, the pressure acquiring unit 10B determines the gas temperature acquired by the temperature acquiring unit 10A 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 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. May be In another example, the monitoring apparatus 100 calculates a value for the conduction current I of the 20 ° C. converted gas pressure difference ΔP 20, and as shown in FIG. 9, the 20 ° C. conversion gas pressure difference ΔP 20 with the conduction current I as the horizontal axis. Plot on the graph as the vertical axis. Then, the monitoring apparatus 100 determines the slope K1 and the intercept K2 by the least squares method, with the regression curve being ΔP20 = K1 * I + K2. Furthermore, the monitoring apparatus 100 determines whether the inclination K1 is equal to or more than a predetermined inclination threshold Kg. If the inclination K1 is equal to or more than the threshold Kg, an alarm is displayed indicating that the contact of the device 6 is a contact failure. It is displayed on the part 13.

  Next, another embodiment will be described.

  FIG. 10 is a diagram for explaining the detailed process of the process in 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, and Based on the molar volume v, a 20 ° C. converted gas pressure P ₂₀ which is a gas pressure obtained by converting the gas temperature T _gas into a reference gas temperature (20 ° C.) is calculated. Further, the temperature acquisition unit 10A corrects the gas temperature T _gas to be 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 enhanced by the correction based on the measurement result, The accuracy of abnormality detection of the device 6 can be enhanced.

  A more detailed description will be given below.

Temperature acquisition unit 10A, in the same way as described with reference to FIG. 6, on the basis of the measured tank temperature T _tank and the current I, calculating a primary estimated gas temperature _T gas0. The configuration of FIG. 10 differs from that of 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, not filtering. The temperature acquisition unit 10A calculates the correction value ΔT = ΔT (i) (i = 1,..., N) of the gas temperature by 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.

The temperature acquisition unit 10A sets the proportional constant K of equation (12) to the initial value K0 = K _I (0) =... K _I (M) = K _T (0) =... K _T (M) = It corrects by feedback of the predetermined period set to 0, and raises accuracy. For example, after determining the proportionality constant K by taking one year of a predetermined period, the temperature acquisition unit 10A fixes the proportionality constant K and operates.

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

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

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, since there is no gas leakage, the molar volume is basically constant, and therefore this average value v ₀ can be regarded as a true value.

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

  Subsequently, the temperature acquiring unit 10A calculates a proportional constant K (T, v, P) with respect to the gas temperature estimation error ΔT (i) of the molar volume error Δv (i) by the 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 _Ttank for the past N days from the recording unit 11, and the correction value ΔK = K (ΔK ₀ , ΔK _I (0) based on the equation (15) ,..., ΔK _I (M), ΔK _T (0),..., ΔK _T (M)) are calculated.

  The embodiments of the present invention described above are exemplifications for explanation of 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 practice the present invention in various other aspects without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Gas-insulated 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 , 2: pressure vessel, 21: sheath, 22: gas, 2 a: pressure vessel, 2 b: pressure vessel, 3: pressure sensor, 4: temperature sensor, 5: conductor (bus), 6: equipment, 7: current sensor, 9 ... Communication line

Claims (12)

A gas-insulated switchgear monitoring device for detecting an abnormality of the device in a gas-insulated switchgear including a plurality of pressure vessels and enclosing the instruments in one or more pressure vessels,
Pressure acquisition means for acquiring the gas pressure in the pressure vessel;
A determination unit that determines that an abnormality occurs in equipment inside the pressure vessel whose gas pressure is higher than that of the other pressure vessels by a predetermined pressure difference threshold or more;
Have
The determination means determines in advance whether gas leaks from the pressure vessel based on the acquired gas pressure, and determines whether or not an abnormality occurs in the device with respect to the pressure vessel in which the gas does not leak . gas insulated switchgear monitoring device. A gas-insulated switchgear monitoring device for detecting an abnormality of the device in a gas-insulated switchgear including a plurality of pressure vessels and enclosing the instruments in one or more pressure vessels,
Pressure acquisition means for acquiring the gas pressure in the pressure vessel;
A determination unit that determines that an abnormality occurs in equipment inside the pressure vessel whose gas pressure is higher than that of the other pressure vessels by a predetermined pressure difference threshold or more;
Have
The determination means calculates the difference between the gas pressure of the pressure vessel to be determined and the gas pressure of the two pressure vessels on both sides of the pressure vessel to be determined, and the value of the difference between the two is the pressure difference threshold. abnormality in said equipment of the determination target of the pressure vessel if more is determined to be occurring, gas insulated switchgear monitoring device. A gas-insulated switchgear monitoring device for detecting an abnormality of the device in a gas-insulated switchgear including a plurality of pressure vessels and enclosing the instruments in one or more pressure vessels,
Pressure acquisition means for acquiring the gas pressure in the pressure vessel;
A determination unit that determines that an abnormality occurs in equipment inside the pressure vessel whose gas pressure is higher than that of the other pressure vessels by a predetermined pressure difference threshold or more;
A pressure sensor that measures the gas pressure inside the pressure vessel;
A current sensor that measures an electric current flowing to a bus passing through the plurality of pressure vessels;
Temperature acquisition means for acquiring the gas temperature in the pressure vessel ;
The pressure difference threshold is expressed as a function of current flow,
The pressure acquisition unit calculates a gas pressure obtained by converting the gas temperature acquired by the temperature acquisition unit into a predetermined reference gas temperature, based on the gas pressure measured by the pressure sensor.
The determination means determines the difference in the gas pressure after conversion, the flowing current measured by the current sensor when the gas pressure used to calculate the difference in the gas pressure is measured by the pressure sensor. is compared with the pressure difference threshold calculated from the function using,
Gas insulated switchgear monitoring device. It further comprises a temperature sensor for measuring the tank temperature on the surface of the pressure vessel,
The temperature acquisition unit calculates the gas temperature based on the tank temperature and the energization current.
The gas insulated switchgear monitoring device according to claim 3 . The pressure acquisition unit calculates the molar volume of the gas in the pressure vessel based on the gas temperature acquired by the temperature acquisition unit and the gas pressure acquired by the pressure acquisition unit itself, and the molar volume is calculated. Calculating the gas pressure obtained by converting the gas temperature into the reference gas temperature based on
The temperature acquisition unit corrects the gas temperature using a correction coefficient calculated based on the molar volume.
The gas insulated switchgear monitoring device according to claim 3 . The gas-insulated switchgear according to any one of claims 1 to 5, wherein the determination means determines the presence or absence of an abnormality of the device in the pressure vessel based on a difference in gas pressure between adjacent pressure vessels. Device monitoring device. A pressure sensor that measures the gas pressure inside the pressure vessel;
And a current sensor for measuring a current flowing through a bus bar passing through the plurality of pressure vessels.
The pressure difference threshold is expressed as a function of current flow,
The determination means uses the supplied current measured by the current sensor when the difference between the gas pressure and the gas pressure used to calculate the difference between the gas pressures are measured by the pressure sensor. Comparing the pressure difference threshold calculated from the function with
Gas insulated switchgear monitoring device as claimed in claim 1 or 2. The device is an electrical circuit with contacts,
An abnormality of the device is a contact failure at the contact point,
The gas insulated switchgear monitoring device according to any one of claims 1 to 7 . A gas-insulated switchgear monitoring method for detecting an abnormality of the equipment in a gas-insulated switchgear, comprising a plurality of pressure vessels and enclosing the equipment in one or more pressure vessels, comprising:
A pressure acquisition unit acquires the gas pressure in the pressure vessel;
In the gas-insulated switchgear monitoring method, the determination means determines that an abnormality occurs in equipment inside the pressure vessel whose gas pressure is higher than that of the other pressure vessels by a predetermined pressure difference threshold or more.
The determination means determines in advance whether gas leaks from the pressure vessel based on the acquired gas pressure, and determines whether or not an abnormality occurs in the device with respect to the pressure vessel in which the gas does not leak . gas insulated switchgear monitoring method. 10. The gas-insulated switchgear monitoring method according to claim 9 , wherein the determination means determines the presence or absence of an abnormality of the device in the pressure vessel based on a difference in gas pressure between adjacent pressure vessels. A gas-insulated switchgear including a plurality of pressure vessels and sealing equipment in one or more pressure vessels;
A monitoring device that acquires the gas pressure in the pressure vessel and determines that an abnormality occurs in equipment inside the pressure vessel whose gas pressure is higher than that of the other pressure vessels by a predetermined pressure difference threshold or more;
Have
The monitoring device determines in advance whether gas is leaking from the pressure vessel based on the acquired gas pressure, and determines whether or not an abnormality occurs in the device with respect to the pressure vessel in which the gas is not leaking . gas-insulated switchgear equipment. The gas-insulated switching facility according to claim 11 , wherein the monitoring device determines the presence or absence of an abnormality of the device in the pressure vessel based on a difference in gas pressure between adjacent pressure vessels.

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