JPH01248926A - Malfunction diagnosing device gas insulated apparatus - Google Patents

Abstract

PURPOSE:To suitably and rapidly cope with a gas insulated apparatus by standardizing a discharge potential from various types of timing transfer pattern, the continuity of a partial discharge and the timing characteristic of a discharging charge amount. CONSTITUTION:Detector groups for obtaining timing transfer information including a partial discharge detector 5a are provided outside a sealed vessel 2. The groups has a partial discharge detector 5a, an acoustic detector 5b, a temperature detector 5c, a snowfall detector 20a, an earthquake detector 20b and a switch opening/closing operation detector 20c. These groups are connected to a diagnosing device 6 through A/D converters 10a-10c, 30a-30c. The device 6 standardizes the generating position of the partial discharge from the timing transfer pattern, the continuity of the partial discharge and the timing characteristic of the discharging charge amount to be judged on the basis of signals obtained from the detector groups.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an abnormality diagnosis device for gas insulated equipment.

[Prior Art] Generally, gas insulated equipment is manufactured by I! Since the electrical equipment is configured in a sealed container filled with a gaseous gas, an abnormality diagnosis device is provided to diagnose abnormalities in the electrical equipment from outside the sealed container.

Conventional abnormality diagnosis devices improve diagnostic accuracy by using a plurality of sensors that detect potential deterioration time characteristics, as described in Japanese Patent Application Laid-Open No. 55-32476 and No. 55-32477, Further, as described in Japanese Patent Application Laid-open No. 10125/1983, diagnostic accuracy was improved by distinguishing between internal abnormalities and external noise by examining the correlation between two types of signals.

[Problems to be Solved by the Invention] Conventional abnormality diagnostic devices have attempted to improve diagnostic accuracy as described above and perform preventive maintenance based on the magnitude of the detected value, but what is important in preventive maintenance is the progression of an abnormality. It is difficult to judge this only from the magnitude of the detected value. To know the extent of this abnormality, it is necessary to locate the abnormality location,
In other words, it is necessary to determine whether the abnormality is occurring in an insulating part made of an insulating material or an insulating part made of an insulating gas, and take appropriate measures accordingly.

The present invention has been made in view of this point, and its object is to provide an abnormality diagnosis device for gas-insulated equipment that can locate the abnormality occurrence part.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a group of detectors that includes a partial discharge detector and obtains information on the time course leading to partial discharge;
When partial discharge is detected by the above partial discharge detector,
A diagnostic device that locates the location of partial discharge based on the temporal transition pattern determined based on the signals obtained from the previous detector group, the continuity of the partial discharge, and the temporal characteristics of the amount of discharged charge. The present invention is characterized by configuring an abnormality diagnosis device for insulation equipment.

[Function] Since the abnormality diagnosis device for gas insulated equipment according to the present invention has the above-described configuration, the temporal transition pattern of possible partial discharges is clear, so it is possible to determine which temporal transition pattern the partial discharge corresponds to based on the signals from the detector group. By determining whether
It is possible to determine the location of partial discharge occurrence, and since the continuity of partial discharge is used to locate the location of partial discharge occurrence when a conductive foreign object occurs, it is possible to avoid adhesion to conductors or insulators and low electric fields. Furthermore, since the attenuation characteristic of the group ffl charge amount is used, adhesion to conductors and insulators can be distinguished and located. Therefore, necessary measures can be taken easily and quickly from the located area.

,[Example] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an abnormality diagnosis device applied to a gas-insulated bus 1, which is a gas-insulated device.

A current-carrying conductor 3 is supported and fixed through an insulating spacer 4 in a sealed container 2 filled with an insulating gas such as SF or gas. A group of detectors for obtaining temporal transition information including a partial discharge detector 5a is provided outside the sealed container 2. In this example, the group of detectors includes a partial discharge detector 5a and an acoustic detector 5b.
, a temperature detector 5C, a snowfall/rain detector 20a obtained from environmental conditions such as weather conditions and natural disaster conditions, an earthquake detector 20b, and an opening/closing operation detector 2°C for a switch. These detector groups each have an A/D converter 10a.
~loc, and are connected to the diagnostic device 6 via 30a to 30c. This diagnostic device 6 includes a storage device 53 for storing signals obtained by the above-mentioned detector group, comparison data 51 for evaluating these signal values, an arithmetic device 50, and an output device 54 for displaying diagnostic results, etc. It is equipped with Here, the partial discharge detector 5a can be a ground wire current detection sensor, a capacitive coupling sensor, etc.
For b, there are ultrasonic microphones (several tens of KHz) and AE (
acoustic emission) sensor (several hundred KH
z) or an acceleration sensor (several KHz), and as the opening/closing operation detector 20c, an electric signal or an operation detector that issues an opening/closing operation command to the switch can be used.

Next, the reason for using the detector group will be explained using FIGS. 7 and 8.

FIGS. 7 and 8 are representative examples of parts in gas-insulated equipment where partial discharge may occur, with the former showing a gas-insulated bus bar and the latter showing a gas-insulated disconnect switch.

The gas insulated bus shown in FIG. 7 is constructed by supporting a conductor 3 with an insulator such as an insulating spacer 4 in a sealed container 2 filled with an insulating gas. The insulating spacer 4 is interposed between the flanges 8 of the sealed container 2 on both sides, and these are connected by a tightening bolt 9.

Most of the various causes of partial discharges have already been eliminated before this gas-insulated bus bar is actually used as power equipment, and past statistics indicate that partial discharge abnormalities during operation are caused by some cause. When conductive foreign objects 41 to 43 pop out, and cracks 45.4 occur in the insulating spacer 4.
It turns out that this is the case when 6 occurs. And M4
The reason for the occurrence of cracks 45 and 46 in the spacer 4 is that the cracks that occurred during manufacturing were detected and the insulating spacer was removed, so moisture that entered the joint between the flange 8 and the insulating spacer 4 froze. This may be due to localized stress concentration, or unexpected vibrations such as an earthquake were applied.

On the other hand, the cause of the occurrence of the conductive foreign matter 41 to 43 is that what remained inside the conductor or inside the electric field mitigation shield flew out due to vibrations such as an earthquake.

Furthermore, the gas insulated disconnect switch shown in FIG.
1 and the conductive side conductor 62 by a movable element 60, and the movable element 60 is driven by an operating device 63 via an insulated operating rod 65 to perform opening/closing operations.

Even in this gas-insulated disconnect switch, most of the various causes of partial discharge have already been eliminated through various tests and inspections before it is actually used as power equipment, and past statistics indicate that partial discharge during operation It has been found that abnormalities occur when a conductive foreign object 71 pops out due to vibration and when a crack 70 occurs in the insulated operating rod 65.

And an insulated operating rod 7 in a switch such as a gas insulated disconnector
The occurrence of cracks at 0 is due to the opening/closing operation, and the occurrence of the conductive foreign matter 71 is due to the remaining foreign matter being thrown out during the opening/closing operation or due to an earthquake.

FIG. 6 summarizes the locations and causes of these partial discharges.

The part surrounded by a dashed line in the same figure represents the cause and location.
The partial discharge caused by the occurrence of is first detected by the partial discharge detector 5a, but the cause of its occurrence is the snowfall and rain detector 20.
The location can be determined by a temperature detector 5c that detects the presence of moisture by a and the occurrence of low temperatures that cause subsequent freezing, or by only an earthquake detector 20b. In other words, the partial discharge detector 5a detects a partial discharge at time t4 in FIG. 2, which shows an example of a temporal transition pattern, and the temporal transition information before that is as shown in the same figure.
If the snowfall/rain detector 20a detects moisture at time t2, and then the temperature detector 5c reaches below freezing at time t2, this means that cracks 45°46 have occurred in the insulating spacer 4 due to localized stress concentration due to freezing. I understand that. In other words, (a) in FIG. 6 can be understood from the temporal transition pattern in FIG. On the other hand, as shown in FIG. 4, although the partial discharge detector 5a detected a discharge at time t, there was no detection by the acoustic detector 5b before a predetermined time, and the earthquake detector 20b detected vibration at time t. If so, it is understood that a crack has occurred in the insulating spacer 4 due to the earthquake, and (b) in FIG. 6 can be understood from the temporal transition pattern in FIG. 4.

Further, the occurrence of conductive foreign matter 41 on the gas-insulated bus bar can be determined from the acoustic detector 5b and the earthquake detector 20b, which detect abnormal noises generated by the repeated lifting and lowering operations of the conductive foreign matter 41. In other words, if a partial discharge is detected by the partial discharge detector 5a at time t3 as shown in Figure 3, and the temporal transition information before that is as shown in the figure, the earthquake detector 5a detects the 20b detects the vibration, and the acoustic detector 5b detects an abnormal sound at time t2, which indicates that the conductive foreign object 41 was thrown out by the earthquake, and (c) in FIG. This can be understood from the temporal transition pattern in the figure.

Furthermore, the occurrence of conductive foreign matter 71 shown in FIG.
It can be located by b. In other words, as in the case of the gas-insulated bus bar, as shown in FIG. 3, the switching operation detector 20c or the earthquake detector 2
0b detects the vibration, and at the subsequent time t2, the acoustic detector 5
If b detects an abnormal noise, it means that a conductive foreign object 71 has been ejected due to vibration in the gas insulated disconnect switch.
(d) in FIG. 6 can be understood from the temporal transition pattern in FIG. 3 if the detector for detecting vibrations is excluded. Further, the occurrence of a crack 70 in the insulation operation piece 65 can be determined by the opening/closing operation detector 20c.

In other words, as also shown in FIG. 4, before the partial discharge is detected by the partial discharge detector 5a at time t3, there is no detection by the acoustic detector 5b and the opening/closing operation is detected by the opening/closing operation detector 20C at time t. , it can be seen that a crack 70 has occurred in the insulation operation shaft 65 due to the opening/closing operation. Therefore, (e) in FIG. 6 can be understood from the temporal transition pattern in FIG. 4 if the detector for detecting vibrations is excluded.

In FIGS. 6(c) and 6(d), it is not possible to determine where the condensation occurs, that is, whether the conductive foreign matter is attached to an insulator, a conductor, or trapped in a low electric field area. Therefore, for this determination, a transition characteristic diagram of the amount of discharged charge Q shown in FIG. 5 is used. In other words, the generated conductive foreign matter 4
1.71 floats in the sealed container 2, but is eventually trapped in a low electric field part that does not pose a problem in terms of insulation and is no longer detected by the partial discharge detector 5a and the acoustic detector 5b; It is possible to consider cases in which the foreign matter adheres to the conductor 3 like the conductive foreign matter 42 shown in the figure, and the case where the foreign matter adheres to the insulating spacer 4 like the conductive foreign matter 43 shown in the figure. The former and the latter can be distinguished by the continuity of the partial discharge, and in the latter case, that is, when the partial discharge continues, the amount of discharged charge Q when attached to the conductor 3 changes over time as shown by the characteristic curve l. However, the amount of discharged charge Q when attached to an insulating material such as the insulating spacer 4
decreases over time as shown by the characteristic curve (2). Therefore, in the latter case, after detecting the partial discharge by the first partial discharge detector 5a in consideration of the time change in the amount of discharged charge Q, by looking at the amount of change in the amount of discharged charge Q, it is possible to detect the adhesion of conductive foreign matter. position.

In other words, it is possible to locate the location where partial discharge occurs.

As can be seen from the above explanation, partial discharges that can actually occur in gas-insulated equipment have five temporal transition patterns, some of which are shown in Figures 2 to 4, and the continuity of partial discharges. And the release '! shown in Figure 5! ! The cause of the occurrence and the location of the occurrence can be located using the temporal change characteristics of the amount of charge.

Fig. 9 shows details of the diagnostic device shown in Fig. 1;
This will be explained with reference to the flowchart in the figure.

The signal detected by the detector group is processed in step 8 of FIG.
The signals are temporarily stored in first memories 16a to 16c and 36a to 36c through comparators 15a to 15c and 35a to 35C, respectively, which determine whether or not the value is greater than a certain set level, such as 0. The auxiliary processing unit 91 transfers the contents of the first memory to the second memory 92 when a signal larger than the set level of the comparator is input as in step 81 . When the contents of the first memory are transferred to the second memory 92, the second memory 92 stores an arbitrary time t and the signal magnitude Q5 at that time, as shown in step 82 of FIG. On the other hand, if the detection signal of the partial discharge detector 5a is larger than the set value of the comparator 15a, that is, if it is detected in step 83 that a partial discharge has occurred, the controller 17 connected to the comparator 15a starts. Next, step 8 in Figure 10
For example, if the partial discharge detector 5a detects a partial discharge for the first time, the abnormality diagnosis program B whose details are shown in FIG.
Start.

This FIG. 12 is a flowchart of a part of the above-mentioned FIG. 6, in which the cause of partial discharge is located by the combination of the signals of the detector group, and the results are displayed on the output device 54 of FIG. I try to do that. Although the display contents 85, 86, and 87 of this FIG. 12 do not include parts,
The output can be displayed in various ways, such as displaying the location at the same time as shown in the figure, or displaying the cause along with the installation position of each detector.

By the way, in the display of foreign matter occurrence 86 in FIG. 12, it is unclear where the conductive foreign matter has settled, and the location cannot be displayed. As mentioned above, conductive foreign matter may reach the low electric field area, which is harmless in terms of insulation, or may have an adverse effect on insulation. 11! ! It may also adhere to the edges. Orientation of this part is performed as follows.

In other words, when the abnormality diagnosis program B shown in Fig. 10 is completed, detection is performed again according to the flow shown in Fig. 10 and according to the predetermined sampling time, and if the partial discharge does not continue, the conductive foreign matter is captured in the low electric field area. It was done,
On the other hand, partial discharge detector 5 detects that partial discharge continues.
a is detected, the second memory 9 is detected in step 82 of FIG.
2, the new time and signal size due to redetection are tttQ
t, and the information stored at the previous time t2 and signal magnitude Q is now stored at time t, -0 and signal magnitude Q,
− Shifted to □. Next, if a partial discharge has been detected by the partial discharge detector 5a, the process proceeds to step 84 via step 83, and since a partial discharge has been detected earlier in step 84, the abnormality diagnosis program A is executed by the main processing unit. 9
3. Therefore, when the abnormality diagnosis program A starts or when a display described below based on this program A appears, it is assumed that a conductive foreign object has not been captured in the low electric field area after it has been generated, but as shown in Figure 7. Either it was attached to the conductor 3 or it was attached to the insulating spacer 4.

The abnormality diagnosis program A is as shown in FIG. 11, and performs the determination shown in FIG. That is, the magnitudes Q, Q, of the signals at time t5 and time t, -0, in the second memory 92 are compared in step 90, and, for example, the released 'trl charges at time 2 and time 0 in FIG. The magnitude of the quantities is compared. When a conductive foreign substance 42 adheres to the conductor 3, Ql and Qll are almost equal as shown in the characteristic curve l, so Qll. -Ql,
=ΔQ≧0, and in this example, it is indicated that it has adhered to a portion dependent on “gas space discharge”. On the other hand, if the conductive foreign matter 43 is attached to the insulating spacer 4, the characteristic curve (2) becomes <Q[, -Ql□=ΔQ<O, in this example.

Displays that it has adhered to areas that depend on "creeping discharge".

In this way, the cause and location can be displayed on the output device 54 of FIG. 1, and appropriate and prompt measures can be taken based on this display. It is preferable that the output device 54 also serves as an input device for changing the set values of the comparators 15a-15c, 35a-35c depending on the model, usage environment, etc.

In the above embodiment, the temporal transition information for determining the temporal transition patterns shown in FIGS. 2 to 4 was obtained by the detector groups shown in FIGS. 1 and 6.
Since the snowfall/rain detector 20a can be replaced with a humidity detector, the detector is not limited to the one example shown, and the temporal transition pattern can be changed accordingly.

[Effects of the Invention] As explained above, the present invention provides a group of detectors that obtain various temporal transition information in order to identify a predetermined temporal transition pattern, and makes a determination based on the signals of this group of detectors. and the temporal transition pattern.

Since we have installed a diagnostic device that locates the site based on the continuity of partial discharge and the time characteristics of the amount of discharge charge, it is possible to take appropriate and prompt measures based on this located site, and it is possible to improve the performance of gas-insulated equipment. Reliability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an abnormality diagnosis device for gas insulated equipment according to an embodiment of the present invention, FIGS. 2, 3, and 4 are diagrams of different temporal transition patterns of partial discharges, and FIG. Figure 6 is a diagram of the combination of detector groups that obtains information on the temporal transition leading to partial discharge. Figures 7 and 8 are diagrams showing the causes and locations of partial discharge. FIG. 9 is a block diagram showing details of the diagnostic device of FIG. 1, and FIGS. 10, 11, and 12 are flowcharts showing programs of the diagnostic device. 5a...partial discharge detector, 5b...acoustic detector, 5
c...Temperature detector, 6...Diagnostic device, 20a...
Snowfall and rain detector, 20b...Earthquake detector, 20c...
Opening/closing operation detector, 50... Arithmetic device, 51... Comparison data, 53... Storage device, 54... Output device. Fig. 1: ZOC/opening/closing movement is not detected Fig. 2: Time Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 6 Part Fig. 7 Fig. 9 Fig. 10 Fig. 12 Fig. 7° lower ram date

Claims (1)

[Scope of Claims] 1. A group of detectors that are installed in gas-insulated equipment that constitutes electrical equipment in a sealed container filled with insulating gas and that obtains information on the time course of partial discharge, including a partial discharge detector. , when a partial discharge is detected by the partial discharge detector, the temporal transition pattern of the partial discharge obtained based on the signals from the previous detector group, the continuity of the partial discharge, and the amount of discharged charge. What is claimed is: 1. An abnormality diagnostic device for gas-insulated equipment, comprising: a diagnostic device for locating a partial discharge occurrence site based on time characteristics. 2. In the device according to claim 1, the detector group includes the partial discharge detector, the acoustic detector,
An abnormality diagnosis device for gas insulated equipment, characterized by comprising a temperature detector, a snowfall/rain detector, an earthquake detector, and an opening/closing operation detector.