JPH0246129A - System of judging abnormal temperature for electric machinery and apparatus - Google Patents

Abstract

PURPOSE:To improve accuracy in judgement of abnormal temperature by arranging temperature detectors on the outer wall face of an electric machine container respectively at positions where it is subjected to heating and where it is not subjected to heating then judging whether the temperature is abnormal or not based on the difference of detected temperature. CONSTITUTION:A conductor 3 for passing a large current is contained in the metallic container 2 for a gas insulated switchgear, where a temperature detector 5 is arranged on the outer wall face of the container 2 at a position corresponding to the joint 4, i.e., a heating portion, of the conductor 3 and another temperature detector 6 is arranged on the outer wall face at a pocket section 2C where there is no heating portion, and both temperature detectors 5, 6 are connected with a judging section 10. Assuming the difference of temperature detected through the temperature detector 5 at the heating side and the temperature detector 6 at the non-heating side is T, abnormality of the temperature T can be judged accurately by previously grasping the relation between the actual temperature at the joint under normal power supply and the temperature of the metallic container as a data base.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a gas insulated switchgear 1 (hereinafter abbreviated as GIS), which is installed outdoors, and a closed panel.

This paper relates to a temperature abnormality monitoring device for electrical equipment such as a transformer, and in particular to a method for determining whether the temperature is normal or abnormal.

[Conventional technology]

Conventionally, as this type of temperature monitoring device, a determination method is known in which a temperature sensor is attached to a device, the temperature is simply measured, and when the temperature exceeds a certain threshold, it is determined that the device is abnormal.

[Problem to be solved by the invention]

In the conventional method, the temperature measured is not only the heat generated from inside the device (but also includes the temperature rise in the device due to so-called external disturbances such as solar radiation and outside temperature), so the threshold value is set with consideration for this disturbance. Therefore, it is difficult to detect early failures in equipment, and there is a major drawback in that they cannot be detected until a certain degree of major failure occurs.

An object of the present invention is to remove disturbances, that is, temperature rises due to solar radiation, outside air temperature, etc. from measured temperature data, and to more accurately grasp the temperature rise from an abnormal part.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention monitors the abnormal temperature of an electrical device using a temperature detector arranged on the outer wall of a metal container housing the electrical device, in which the metal container houses the electrical device. It has a part that stores the heat generating part and a part that does not store it, and a temperature sensor is placed on the outer wall surface of both parts under almost the same environmental conditions to detect the temperature of the metal container. From this, it is determined whether the heating part is generating normal heat or abnormal heat.

[Effect]

In the above method, the influence of disturbance conditions is eliminated by detecting the temperature of a part that is easily affected by heat and a part that is not easily affected by the heat of the heat generating part of the storage container of the electrical equipment, and determines abnormal temperature based on the temperature difference. Therefore, it is possible to more accurately grasp the heat generation temperature of electrical equipment.

〔Example〕

The present invention will be explained below based on examples.

Figure 1 is a GIS for explaining an embodiment of this invention method.
FIG. 2 is a configuration diagram of the device including a cross section of the main part of the device.

In the figure, a metal container 2 of the GIS houses a conductor 3 through which a large current (1) passes, and a temperature detector 5 is installed on the outer wall of the container 2 facing the connecting part 4 of the conductor 3 which is a heat generating part. A temperature detector 6 is provided on the outer wall surface of the pocket section 2C where the heat generating section of the container 2 is not present, and both are electrically connected to the determination section 10. Furthermore, the temperature detectors 5 and 6 are installed at positions where the sunlight conditions and ambient temperature of the metal container 2 are approximately equal. Now, the detected temperature of the heat generating part side temperature detector 5 is ′
ll 5. The detected temperature of the non-heat generating part side temperature detector 6 is Ts2.
Let both calibration detection temperatures be +[5-l116=T.

Fig. 2 is a temperature change characteristic diagram for 24 hours a day obtained by the method of the embodiment, in which the flow condition of the connection part 4 is normal and the α flow rate changes from 11 to I2Iζ after 1 time tI. This example shows the case where the The detected temperatures +1'+5 and T6 are strongly influenced by sunlight conditions and exhibit a mountain-shaped characteristic with a peak value around noon.
= Ill 5 - Ill , shows a flat curve that changes in a stepwise manner as the current I changes, and shows a characteristic that reflects the heat generation state of the heat generating part 4, with the influence of disturbance almost eliminated. Therefore, it is important to understand the relationship between the actual temperature of the connection part 4 and the metal container temperature under normal energization as a database in advance.
It is possible to accurately determine whether the temperature difference T is normal or abnormal, and
Abnormal temperatures can be automatically monitored by comparing the temperature difference T obtained in the judgment unit 10 with a threshold value.

FIG. 3 is a temperature characteristic diagram obtained in the same manner as in FIG. 2, and shows an example of a case where an abnormality in energization occurs in the connection portion 4. As is clear from the figure, current ■1 and
is the same as in Fig. 2, the temperature difference T=Ts
-Ts is large (and indicates the direction in which the temperature difference increases over time), thereby clearly indicating the occurrence of an abnormal temperature.

Figure 4 is a temperature characteristic diagram when there is a change in solar radiation conditions.The current I is held at a constant value, the detected temperature T6 is temporarily lowered by the non-heat generating cover, and the temperature Difference T
increases, but there is no change in the temperature T5 detected by the temperature detector 5 on the heat generating part side, and the current is also kept constant. Therefore, by combining these data, it can be determined that there is a change in the disturbance condition. Since it is visible, it is possible to distinguish it from changes caused by disturbance conditions.

〔Effect of the invention〕

As mentioned above, in this invention, temperature detectors are provided on the container wall surface of the part of the housed electrical equipment that is likely to generate heat, and on the outer wall surface of the container that is not easily affected by the heat of the heat generating part, and abnormal temperatures are detected by detecting the difference between the detected temperatures of the two detectors. The method was used to determine whether or not the

As a result, if the disturbance conditions, etc. of both temperature detectors are the same, the influence of the disturbance is non-linear, and a temperature difference that reflects only the temperature rise of the heat generating part is obtained, so the accuracy of abnormal temperature judgment is compared to that of the conventional method. can be significantly increased. Furthermore, even if there is a temporary difference in sunlight conditions, there is an advantage that this can be discriminated from both detected temperatures and the reflux value.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a device showing an embodiment of the present invention, Fig. 2 is a temperature characteristic diagram in a normal energization state according to the embodiment, Fig. 3 is a temperature characteristic diagram in an abnormal energization state, and Fig. 4 is a @ degree characteristic diagram when a difference occurs in solar radiation conditions. 2... Metal container, 3... Large current conductor, 4... Connection part (heat generating part), 5... Temperature detector (heat generating part side), 6...
... Temperature detector (non-heat generating part side), 10... Judgment part, T
s, Ts...detected temperature,'1゛...detected temperature difference. brown 1 figure

Claims (1)

[Claims] 1) Abnormal temperatures of electrical equipment are monitored by a temperature detector placed on the outer wall of a metal container housing the electrical equipment, where the metal container has a part that stores the heat generating part of the electrical equipment and a non-storage part. , the temperature of the metal container is detected by placing temperature detectors on the outer walls of both parts under almost the same environmental conditions, and it is determined whether the heat generating part is generating normal heat or abnormal heat based on the difference in the detected temperatures of both temperature detectors. An abnormal temperature determination method for electrical equipment characterized by the following.