JPS62225116A - Gis gas pressure monitoring method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a G[S gas pressure monitoring method.

(Prior Art) Generally, in gas insulated switchgear (GIS), it is necessary to monitor gas pressure. As a monitoring system at this time, the output of the gas pressure sensor installed in the GIS is
The data is input to the converter, converted to digital data, and processed by the computer of the system slave station. The data processed here is transmitted to the system master station via a data transmission device, where it is processed and displayed on a display unit (CRT).

On the other hand, when the mechanical gas pressure abnormality detection device δ (detection relay) operates, its contact output is sent to the digital input section of the computer for processing, and sent as an alarm signal to the system master station via the data transmission device. , here it is displayed or printed in CITT and GA.

Figure 4 shows the concept of conventional gas pressure sampling. Gas pressure hardly changes during steady state, and even if it changes, the value is small, so there is almost no point in performing a large number of samplings within a short period of time.

Therefore, for example, as shown in Fig. 4, 10
Sampling is performed every minute, and in order to eliminate the influence of external noise and other transients, if the values are sampled three times every 10 minutes and the same value is correct all three times, that value is sent as a normal value. We are taking measures such as:

For this reason, for example, n5, where the gas pressure change in Figure 4 occurs, is
The first sampling is detected at time t1, but since it is significantly different from the previous sampling value (10 minutes ago), the gas pressure value is detected only at sampling time 20 minutes later. is transmitted as an abnormal value, and the gas pressure value is displayed on the CRT as the time elapses after the gas pressure drops (62+20 minutes).

FIG. 5 shows a flow diagram of these data samplings. That is, data value 1 is read (step 51), stored (step 52), and after 10 minutes, the next data value 2 is read (step 54) and compared.

If they are the same, data value 1 is discarded (step 54) and data value 2 is stored.

After another 10 minutes, data value 3 is read (step 511).
) and is compared with data value 2 (step 513). If data value 3 and data value 2 are the same (step 515),
Data value 3 is transmitted (step 51G).

If the data values are the same, it is compared with the data value of the next numbering (step 517).

In this way, a method is adopted in which only when the same data value occurs three times in a row at 10 minute intervals, for example, is transmitted as an abnormal value. In addition to this method, if the data values match two out of three times, then that value is transmitted as the data value.

(Problems to be Solved by the Invention) As shown in Figure 4, when the gas pressure drops abnormally, such as when the gas pressure detection relay is activated, the alarm signal from the gas pressure detection relay is immediately displayed on the CRT. The gas pressure value at that time is sampled for a certain period of time (for example, 10 minutes) and is not accepted unless it is the same value two or three times in a row. Unless there is a time delay, the information cannot be confirmed on the CRT, resulting in inconvenient maintenance.

The present invention has been made to solve the above-mentioned problems.
The objective is to provide an IS gas pressure monitoring method.

[Configuration 1 of the Invention (Means for Solving the Problems) In the present invention, gas pressure is sampled at regular intervals and C
In addition to the means for displaying on the RT, it is equipped with a mechanical gas pressure detection means.

(Function) When the mechanical gas pressure detection means is in operation, a gas pressure sampling interrupts the sampling operation at fixed time intervals, and the resulting sampling value is immediately displayed on the CRT.

(Example) Examples will be described below with reference to the drawings.

FIG. 1 is a configuration diagram of an embodiment for explaining the GIS gas pressure monitoring method according to the present invention.

1 is a GIS container filled with SF6 gas at a constant pressure.
When the gas pressure drops, the insulation of the internal conductor is no longer maintained, so it must be constantly monitored.

2 is a gas pressure sensor, and 3 is a mechanical detection relay for alarming and related breaker tripping when the gas pressure is abnormally low. This relay is equipped with a gas pressure abnormality detection relay contact 4. The output from the gas pressure sensor is converted into an electrical signal by A/D.
It is input to converter 5.

Further, the gas pressure abnormality detection relay contact 4 is inputted to the terminal 6 as a digital input. These input signals are processed by the CPU 7.

Since the gas pressure value does not change significantly unless there is a particular abnormality such as a hole in the tank, a method such as sampling the gas pressure every 10 minutes is used. This sampling value is input to the CPU 7-1 of the system master station 15 via the data transmission device 8.

This data is displayed on the CRT 11 and output to the typewriter 12 as required. In addition, in order to view the long-term trend of gas pressure, the data is stored in the memory 10 as a data value.

On the other hand, the gas pressure abnormality detection relay contact 4 is constantly scanned as alarm information, and the data is transmitted to the system master station 15 side at the same time as the alarm occurs, and CR is sent as an alarm.
It is output to T11 and typewriter 12.

Gas pressure steady 4 non-bringing is sampled at 10 minute intervals by CPt17 as described above (■, ■ in Figure 2).
,■,■ points).

However, when the gas pressure abnormality detection relay contact 4 of the mechanical gas pressure detection relay 3 goes to 11, alarm information is input to the CPU 7, and emergency gas pressure sampling as shown by diagonal lines in FIG. 2 is immediately performed. Slight time delay Δt'
Later, this gas pressure value is transmitted to the CRT 1 of the system master station 15.
1 can be displayed on top.

FIG. 3 shows a flow diagram of gas pressure sampling.

That is, the presence or absence of operation of the gas pressure detection relay is constantly monitored (steps 61, 62, 63), and if it is activated, emergency gas pressure sampling is immediately performed (step 64), and real-time processing is performed as a gas pressure value (step 65). ). If there is no movement, continue monitoring the continuous value three times every 10 minutes.

By implementing such a method, the mechanical gas pressure detection relay will operate even during normal gas pressure sampling at regular intervals. When abnormal gas pressure occurs, this detection relay signal will trigger emergency sampling. Because it is possible to
When sampling every 10 minutes, at least 10
If the sample is continuously sampled three times within a minute as in this example, the inconvenience of a time delay of (20 minutes and ten tons) can be avoided.

In other words, by performing emergency sampling, alarm information due to the operation of the detection relay can be displayed on the CRT, and gas pressure values can be displayed in real time at almost the same time.
When a gas pressure abnormality occurs, such as when a detection relay operates due to a time delay in the gas pressure value as in the past, even if an abnormality alarm is generated by a mechanical gas pressure relay, the gas pressure value is not the current value, but 10 Since data older than minutes or 20 minutes is displayed, it is difficult to grasp the current data of an abnormality, and there is a risk of misjudgment.According to the present invention, such inconveniences can be avoided.

[Effect of the invention] As explained above, since the gas pressure value hardly changes,
There is almost no point in sampling it many times within an extremely short period of time, and it unnecessarily monopolizes the computer and increases the memory capacity. Therefore, by sampling at regular intervals, such as sampling at 10 minute intervals, the burden on the computer and the memory capacity can be saved.

Furthermore, since the gas pressure sensor is installed near the GIS, it is easily susceptible to electrical noise intrusion, and if noise from the GIS happens to intrude and the sampling is performed, erroneous output may be retrieved as data. Therefore, as described in the description of the present invention, when the same data value is obtained three times in a row, that value is adopted as the data value.

Therefore, in the worst case, only data values with a time delay of about 30 minutes are displayed on the CRT.
Although it may not be possible to obtain the above, when there is an abnormal gas pressure such as when the gas pressure detection relay is activated, emergency sampling can be performed in addition to the numbering period described above, so that the gas pressure value can be measured in real time only when the gas pressure is abnormal. Since it can be processed using GIS, it is possible to provide more accurate data than before, which is extremely effective for safe operation of GIS.

[Brief explanation of drawings]

Fig. 1 is a system configuration diagram of an embodiment for explaining the GIS gas pressure monitoring method according to the present invention, Fig. 2 is a time chart of gas pressure sampling, Fig. 3 is a flow chart showing the process of gas pressure sampling, FIG. 4 is a time chart of conventional gas pressure sampling, and FIG. 5 is a flowchart 1- showing the conventional gas pressure sampling process. 1...GIS container 2...Gas pressure sensor 3.
...Gas pressure abnormality detection relay (mechanical gas pressure detection relay) 4...Gas pressure abnormality detection relay contact (detection relay output contact) 5...To 10 converter 6...Digital input terminal 7.7-1 ...CPU 8.8-1...Data transmission device 9...Transmission cable 10...Memory 11...
CRT 12... Typewriter 13.
...GIS 14...System slave station 15
...System master station

Claims (1)

[Claims] In a GIS gas pressure monitoring method in which the gas pressure of a gas insulated switchgear (GIS) is sampled at fixed time intervals and the sampled value is displayed on a display unit, when the mechanical gas pressure detection device is operated, in addition to the fixed time sampling, A GIS gas pressure monitoring method characterized by immediately interrupting gas pressure sampling and displaying the gas pressure value detected by the interruption sampling on a display unit.