JPH09163529A - Monitor/controller of gas insulated machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To estimate a time by which a gas density reaches a limit density immediately when the gas density decline happens, select a proper action in accordance with an allowance time and make the cause of the gas density decline clear. SOLUTION: A monitor/controller of a gas insulated electric machine is composed of a gas pressure detector 2, a thermosensor 4, A/D converters 3 and 5, a gas density calculating means 6, a gas density comparing means 7, a gas density variation rate calculating means 8, an estimated time calculating means 9, a waveform storing means 13, a data base 14 and a waveform comparing means 15. When a gas density declines, the monitor/controller outputs not only a control signal and an alarm signal but also a time by which the density reaches a limit density to maintain the insulation security and, further, the estimated cause of the density decline.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulating device monitoring / controlling device for detecting a gas leak of a gas insulating device at an early stage while ensuring insulation guarantee.

[0002]

2. Description of the Related Art FIG. 8 shows, for example, JP-A-1-129702.
It is the conventional monitoring / controlling apparatus for gas insulation equipment disclosed in Japanese Patent Publication No. A gas pressure detector 2 and a temperature detector 4 are mounted adjacent to the gas insulation device 1. The gas pressure signal from the gas pressure detector 2 is the A / D converter 3 which is the first input means.
Has been entered. The internal temperature signal from the temperature detector 4 is input to the A / D converter 5 which is the second input means. The gas pressure of the gas insulation device 1 detected by the gas pressure detector 2 is converted into a digital signal in the A / D converter 3 and then input to the gas density calculation means 6. Similarly, the internal temperature signal detected by the temperature detector 4 is
After being converted into a digital signal in the A / D converter 5, it is input to the gas density calculating means 6. Since gas density is a function of pressure and temperature, gas density J = F (P, T) (P: pressure,
The gas density is calculated by the relational expression (T: temperature).
If there is no gas leak, the gas density is constant. Next, the calculated gas density is input to the gas density comparing means 7 and the gas density change rate calculating means 8. In the gas density comparison means 7, the gas density that can ensure the insulation guarantee is initially set. If the input gas density value is lower than this value, a device control signal (a GIS operation block signal). Etc.) and an alarm signal is output. In the gas density change rate calculation means 8, a certain appropriate negative change rate dJ / dt (t: time) is initially set. If the rate of change of the input gas density value with time is abrupt and the rate of change is equal to or higher than the initial set value, an alarm signal is output. The output signals from the gas density change rate calculating means 8 and the gas density comparing means 7 are both OR circuits 10.
The alarm signal is output by one of the outputs. By allowing the gas density comparing means 7 to have a margin in its initial setting, or by providing a number of comparison levels, a gentle gas leak can be detected at an early stage. If you want to obtain more detailed data, use the above data from the CPU.
It suffices to perform the processing via the and display it on the status display unit 20 such as a CRT.

[0003]

Since the conventional monitoring / controlling device for gas insulation equipment is constructed as described above, the gas density is lower than the set value or the change rate (decrease rate) of the gas density is set. When it is larger than the value, it only outputs the control signal and the alarm signal, so when the alarm occurs, the time to reach the limit density for ensuring insulation guarantee is not immediately known,
There is a problem that there is no room to select an appropriate treatment according to the margin time and that it takes a long time to elucidate the cause of the decrease in gas density.

The present invention has been made to solve the above-mentioned problems, and when the gas density is lowered, the time until the critical density is reached is immediately known, and an appropriate measure is taken according to the margin time. It is an object of the present invention to provide a device capable of selecting the above, and clarifying the cause of the generation at an early stage.

[0005]

According to the present invention, there is provided a monitoring / controlling apparatus for gas insulation equipment, comprising: first input means for taking in a gas pressure signal from a gas pressure detector provided in the gas insulation equipment; and gas insulation equipment. Second input means for taking in an internal temperature signal from a temperature detector provided in the device, gas density calculating means for calculating a gas density based on the gas pressure signal and the internal temperature signal, and a calculation result and setting of the gas density. A gas density comparing means for comparing the value with a value to output the determination result and the equipment state, a density change rate calculating means for computing the rate of change of the gas density and outputting the equipment state by comparing with the set value, and a change in the gas density And a predicted time calculating means for calculating and outputting the time required to reach the set value based on the rate.

Further, based on the output of the predicted time calculation means, first and second input means, gas density calculation means,
The gas density comparing means and the monitoring interval adjusting means for adjusting the operation cycle of the density change rate calculating means are provided.

Further, it is provided with a man-machine interface for manually setting the monitoring interval adjusting means.

Further, the waveform storage means for storing the output of the gas density calculation means, a database in which the gas density change waveform for each factor is stored in advance, and the stored contents of the waveform storage means and the database are compared, and the result is compared. It is provided with a waveform comparing means for outputting.

Further, it is provided with a waveform comparing means and a database updating means for updating the database by the output of the waveform storing means.

Further, a man-machine interface for confirming and editing the contents of the database and setting the judgment conditions of the waveform comparing means is provided.

Furthermore, a ring memory and a memory controller are provided, and a waveform storage means is provided for storing only when the output of the density change rate calculation means exceeds a set value.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Embodiment 1 of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a gas insulation device, 2 and 4 are a gas pressure detector and a temperature detector attached to the gas insulation device 1, and 3 and 5 are a gas pressure detector 2 and a temperature detector, respectively. A / D connected to 4
The converter, 6 is a gas density calculating means for calculating the gas density from the outputs of the A / D converters 3 and 5, and the outputs thereof are a gas density comparing means 7, a density change rate calculating means 8 and a prediction time calculating means 9 respectively. Has been entered in.

Next, the operation will be described. The gas pressure of the gas insulation device 1 detected by the gas pressure detector 2 is A /
After being converted into a digital signal by the D converter 3, it is input to the gas density calculating means 6. Similarly, the internal temperature signal detected by the temperature detector 4 is converted into a digital signal in the A / D converter 5 and then input to the gas density calculation means 6, and the gas density calculation means 6 calculates the gas density. It If there is no gas leak, the gas density is constant.
Next, the calculated gas density is input to the gas density comparison means 7, the gas density change rate calculation means 8, and the predicted time calculation means 9. In the gas density comparison means 7, the gas density that can ensure the insulation guarantee is initially set, and if the input gas density value is lower than this, a device control signal and an alarm signal are output. It In the gas density change rate calculation means 8, a change rate in a certain negative direction is initially set, and calculation is performed by the gas density input from the gas density calculation means 6, and as a result, the time change rate is equal to or greater than the initial value. When the value is indicated, an alarm signal is output. Since the output signals from the gas density change rate calculating means 8 and the gas density comparing means 7 are both input to the logical sum circuit 10,
An alarm signal is output by either one of the outputs. Further, in the predicted time calculating means 9, the calculation is performed based on the gas density input from the gas density calculating means 6, and the time from the calculated rate of change of time until reaching the gas density at which the insulation guarantee can be secured initially set. Is calculated and the predicted time is output.

Embodiment 2 FIG. In the first embodiment described above, the method of collecting and calculating the data from the gas insulation device 1 at a constant cycle has been described, but it may be adjusted according to the rate of change of the gas density. Will be described. In FIG. 2, reference numeral 11 is input with the predicted time data from the predicted time calculation means 9, and is input to the A / D converters 3, 5, the gas density calculation means 6, the gas density comparison means 7, and the gas density conversion rate calculation means 8. The monitoring interval adjusting means outputs a monitoring interval setting signal.

Next, the operation will be described. When the arrival time to the insulation guarantee limit input from the predicted time calculation means 9 is shorter than the preset time, the monitoring interval adjustment means 11 narrows the monitoring intervals as the predicted arrival time becomes shorter. The accuracy of time prediction is improved by outputting the monitoring interval setting signal. Further, when the time is longer than the preset time, the processing interval is reduced by outputting the monitoring interval setting signal so that the monitoring interval is a constant cycle wider than the interval.

Embodiment 3 In the second embodiment described above, the method of automatically adjusting the monitoring interval has been described.
As shown in FIG. 3, a man-machine interface 12 may be provided so that the monitoring interval adjusting means 11 can be set from the outside, and it is possible to easily perform the optimum setting for the state of the device during installation adjustment and maintenance. You can

Embodiment 4 In the above-described first embodiment, the method of outputting only the control signal of the device, the alarm signal, and the predicted arrival time to the insulation guarantee limit from the value of the gas density and its conversion rate has been described, but the change in the gas density is stored as a waveform. However, the estimated cause may be output by comparing the waveform with a waveform stored in advance, and the embodiment will be described below.

In FIG. 4, 13 is a gas density calculating means 6
Waveform storage means for inputting the gas density from, the reference numeral 14 is a database in which the waveform and its cause when the gas density is lowered are stored in advance, and 15 is a waveform comparison means connected to the waveform storage means 13 and the database 14. 14 receives the signal from the waveform storage means 15 and outputs the estimated cause.

Next, the operation will be described. The waveform storage unit 13 sequentially stores the gas density data input from the gas density calculation unit 6 as a waveform. On the other hand, database 14
The waveforms at the time of gas density decrease obtained from past cases and their causes are stored in advance. The waveform comparison means 15 compares the waveforms in the waveform storage means 13 and the database 14, and if it is determined that they match under the conditions set in advance in the waveform comparison means 15, a match signal is sent to the database 14. Is output. When the coincidence signal is input, the database 14 outputs the cause of the decrease in gas density stored in association with the waveform output to the waveform comparison means 15 at that time as an estimated cause.

Embodiment 5. In the fourth embodiment, the contents of the database are stored in advance, but the data may be automatically updated by the data obtained by monitoring the actual equipment. Hereinafter, the embodiment will be described. To do.

In FIG. 5, reference numeral 16 is a waveform input from the waveform storage means 13, and a coincidence signal is input from the waveform comparison means.
It is a database updating means for outputting the updated data to the database 14.

Next, the operation will be described. When the coincidence signal is output from the waveform comparison unit 15 by the same operation as in the fourth embodiment, the database updating unit 16 determines the estimated cause of the waveform stored in the waveform storage unit 13 by the database 14 at that time. Is output to the database 14 as a waveform associated with, and the content is updated (added).

Embodiment 6 FIG. In the above fourth and fifth embodiments, the conditions for determining the coincidence of the waveforms are preset, and the database is automatically updated. However, as shown in FIG. 17, the database 14 can be used for maintenance such as addition of data obtained from other devices and editing of existing data, and the waveform comparison means 15 can be used to set the determination conditions for waveform matching. By doing so
It is possible to easily make the optimum settings for the state of the equipment during installation adjustment and maintenance.

Embodiment 7 FIG. In the above-described fourth embodiment, the waveform storage means constantly repeats the storage of the gas density data, and the waveform comparison means has been described as the method of performing the successive comparison, but when the rate of change of the gas density becomes a certain value or more. May be compared with the above, and the embodiment will be described below.

In FIG. 7, 18 is a ring memory and 19 is a ring memory.
Is a memory control unit, the waveform storage unit 13 is composed of a ring memory 18 and a memory control unit 19, and the output of the gas density change rate calculation unit 8 is connected to the memory control unit 19.

Next, the operation will be described. The ring memory 18 uses a memory having a limited capacity and is controlled by the memory control unit 19 so that data is sequentially stored from the beginning and when the end position is reached, the data is returned to the beginning and stored again. The gas density data output from the gas density calculating means 6 is always input to the ring memory 18 and always stores a constant amount of the latest data. When the gas density change rate calculating unit 8 detects a change rate equal to or higher than a preset value, a detection signal is output to the memory control unit 19, data storage in the ring memory is stopped, and the waveform is saved. After that, the same operation as that of the fourth embodiment is performed.

Embodiment 8 FIG. In the above-described Embodiment 7, the method of temporarily suspending the storage of new gas density data while the data in the ring memory is being stored has been described. However, when a plurality of ring memories are provided and the first ring memory is in the data storage state. At the same time, by configuring to start data storage in the next ring memory, waveform storage is performed without interrupting data storage.

[0028]

Since the present invention is configured as described above, it has the following effects.

When the decrease of the gas density and the rate of change of the gas density are equal to or more than a set value, an alarm is issued, and an expected time to reach the limit at which insulation guarantee can be ensured is calculated and output to select an appropriate measure. . Further, when the rate of change of the gas density is large, the accuracy of the predicted time to reach the limit can be improved by reducing the monitoring interval of each component. Further, the monitoring interval can be set from the outside, so that the installation adjustment and the maintenance can be facilitated.

Further, by using the database storing the waveform and the cause of the decrease in gas density, the cause of the decrease in gas density is output as an estimated cause, so that the cause can be clarified easily. Further, since the database is updated with the collected waveforms, it is possible to improve the accuracy of the cause estimation from the next time onward.

Further, confirmation / editing of the contents of the database,
Since the determination conditions of the waveform comparison means are set externally, the installation adjustment and maintenance can be easily performed.
Furthermore, since the waveform is stored only when the density change rate is equal to or higher than a certain value, the processing efficiency of the monitor / control device can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a third embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a fifth embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a sixth embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a seventh embodiment of the present invention.

FIG. 8 is a block diagram showing a configuration of a conventional system.

[Explanation of symbols]

1 Gas Isolator 2 Gas Pressure Detector 3 A / D Converter (First Input Means) 4 Temperature Detector 5 A / D Converter (Second Input Means) 6 Gas Density Calculation Means 7 Gas Density Comparison Means 8 Gas density change rate calculation means 9 Prediction time calculation means 10 OR circuit 11 Monitoring interval adjustment means 12 Man-machine interface 13 Waveform storage means 14 Database 15 Waveform comparison means 16 Database update means 17 Man-machine interface 18 Ring memory 19 Memory control section

Claims (7)

[Claims] 1. A first input means for capturing a gas pressure signal from a gas pressure detector provided in the gas insulation device, and a second input for capturing an internal temperature signal from a temperature detector provided in the gas insulation device. Means, a gas density calculating means for calculating a gas density based on a gas pressure signal and an internal temperature signal, a gas density comparing means for comparing a calculation result of the gas density with a set value, and outputting a judgment result and a device state, a gas density A density change rate calculating means for calculating the change rate of the gas and outputting the device state by comparison with the set value, and an estimated time calculating means for calculating and outputting the time until the set value is reached by the change rate of the gas density are provided. A monitoring / control device for gas-insulated equipment. 2. A monitoring interval for adjusting the operation cycle of the first and second input means, the gas density calculation means, the gas density comparison means, and the density change rate calculation means based on the output of the predicted time calculation means. 2. An adjusting means is provided, wherein the adjusting means is provided.
Monitoring and control device for gas insulation equipment as described in. 3. The monitoring / controlling apparatus for gas-insulated equipment according to claim 2, further comprising a man-machine interface for manually setting the monitoring interval adjusting means. 4. A waveform storage means for storing the output of the gas density calculation means, a database in which a gas density change waveform for each factor is stored in advance, and the stored contents of the waveform storage means and the database are compared, and the result is compared. The monitoring / control apparatus for gas-insulated equipment according to claim 1, further comprising waveform comparison means for outputting. 5. The monitoring / control apparatus for gas-insulated equipment according to claim 4, further comprising a waveform comparing means and a database updating means for updating the database by the output of the waveform storing means. 6. The monitoring / control apparatus for gas-insulated equipment according to claim 5, further comprising a man-machine interface for confirming and editing the contents of the database and for setting the judgment condition of the waveform comparison means. 7. A ring memory and a memory controller,
The monitoring / control apparatus for gas-insulated equipment according to claim 4, further comprising a waveform storage means for storing only when the output of the density change rate calculation means exceeds a set value.