JP3487578B2 - Abnormality diagnosis device for electric operating device for switch - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality diagnosis device for an electric operating device for a switch for opening and closing a switch body such as a disconnector or a grounding device. 2. Description of the Related Art In general, an abnormality diagnosis of an electric operating device for opening and closing a switch body is carried out at regular maintenance inspections by visually confirming an operation condition, measuring a dimension of an adjustment portion by a scale, and stopping. The operating time is measured using a watch to determine whether there is an abnormality. In addition, parts that are likely to deteriorate due to aging are dealt with by regular replacement of parts and re-adjustment. [0003] In the abnormality diagnosis by the periodic inspection described above, a diagnosis with sufficient reliability cannot always be performed due to individual differences between inspectors and restrictions on accuracy of measuring instruments. Until the next inspection, a malfunction such as an open / close operation failure may occur. In addition, regular and uniform replacement and replacement of all parts implies urgent care for the majority of normal switches that have not been degraded. Is causing loss. Accordingly, an object of the present invention is to provide an electric operation for a switch which can perform an abnormality diagnosis with higher reliability than before, reduce opening / closing operation defects, etc., and can streamline maintenance and inspection by eliminating urgent maintenance. An object of the present invention is to provide a device abnormality diagnosis device. [0005] According to the present invention, an electric motor,
A control current detecting device for controlling and driving the electric motor, and a control current detecting device for detecting a control current of a control power source in an abnormality diagnosis device for an electric operating device of a switch for opening and closing a switch body by the electric motor. An operation current detection unit that detects an operation current of the operation power supply; a control voltage detection unit that detects a control voltage of the control power supply; a temperature detection unit that detects an internal temperature of the electric operation device; The control current waveform and the operation current waveform respectively detected by the current detection unit and the operation current detection unit, the control voltage detected by the control voltage detection unit, and the device internal temperature detected by the temperature detection unit are recorded. A recording unit, and a time difference at which both flows start from the control current waveform and the operation current waveform recorded by the recording unit, and the control recorded by the recording unit. The pressure and the device internal temperature as a parameter, is compared with the control value set in advance and the time difference, and a determining operation determining unit whether there is an abnormality. The present invention constructed as described above operates as follows. When an opening or closing operation command is issued to the electric switch operating device, the control power is first turned on, the mechanical lock mechanism is disengaged, the auxiliary relay is excited, and the operation power is turned on. When the operation power supply is turned on, the electric motor starts, drives the coupling mechanism, and finally opens and closes the contact portion. At this time, a mechanical operation is required for releasing the mechanical lock mechanism and exciting the auxiliary relay, and a timing difference occurs between the operation command and the start of the electric motor. Therefore, if the control current is detected by the control current detection unit, the operation current is detected by the operation current detection unit, the waveform is recorded by the recording unit, and the calculation determination unit determines the time difference between the two starts to flow by comparison. A time difference corresponding to this timing shift can be obtained. When the switch is in a normal state, the time difference is substantially constant. However, when an abnormality occurs in the mechanical lock mechanism or the auxiliary relay, the time difference changes greatly. Therefore, by setting an allowable range as a management value in advance, it is possible to determine that an abnormality occurs when the obtained time difference deviates from the allowable range. The contact portion is finally opened and closed by the opening or closing operation command. At this time, the control voltage value can be detected by the control voltage detecting portion, and the internal temperature of the electric operating device can be detected by the temperature detecting portion. On the other hand, even when the switch is in a normal state, the time difference between the start of the flow of the control current and the operation current slightly changes depending on the control voltage and the internal temperature of the device. Can be set in advance. Therefore, a highly accurate abnormality diagnosis can be performed by comparing the obtained time difference with a control value using the control voltage and the apparatus internal temperature as parameters. FIG. 1 to FIG. 4 show an embodiment of the present invention.
Shown in In these figures, the disconnector is connected to the disconnector body 10.
And an electric operation device 11 for opening and closing the disconnector main body 10 via a coupling mechanism 12. Disconnector body 1
Numeral 0 is composed of a conductive portion 1 and a contact portion 2 forming an electric circuit, and an insulator portion 3 for maintaining insulation between the electric circuit and the ground 4. The electric operating device 11 has an electric motor 31 controlled and driven by a control power supply 13 and an operation power supply 14. The control power supply 13 is connected to the operation command push button 32, the auxiliary relay 35, and the trip coil 34, and a circuit is formed. The operating power supply 14 is connected to the electric motor 31, the contact 35a of the auxiliary relay 35, and the mechanical lock mechanism 33 operated by the trip coil 34, thereby forming a circuit. A control current detector 21 for detecting the control current 15 is provided in a circuit to which the control power supply 13 is connected. An operation current detector 22 for detecting the operation current 16 is provided in a circuit to which the operation power supply 14 is connected. Provide. As the control current detection unit 21 and the operation current detection unit 22, a clamp type current transformer, a shunt resistance, or the like can be used. A control voltage detector 25 for detecting a control voltage of the control power supply 13 of the electric operating device 11 is provided. Further, a temperature detector 26 for detecting the internal temperature of the electric operation device 11 is provided. Further, a recording unit 43 is provided for taking in the output signals of the control current detection unit 21 and the operation current detection unit 22 and recording the detected control current waveform and operation current waveform, respectively. As the recording unit 43, a digital oscilloscope or the like can be used. The recording unit 43 records the control voltage and the device internal temperature detected by the detection units 25 and 26, and also stores the control current 15 and the operation current 16 detected by the control current detection unit 21 and the operation current detection unit 22. Record. Further, the control current waveform and the operation current waveform recorded by the recording unit 43 are fetched, a time difference ΔTx at which the two start to flow is obtained, and the time difference ΔTx is compared with a preset management value ΔT0. , An operation determination unit 44 for determining the presence or absence of an abnormality is provided. As the operation determination unit 44, a personal computer or the like can be used. In addition,
The management value △ T0 of the operation judging section 44 is set as follows.
In other words, when the control voltage decreases, the voltage for exciting the trip coil 34 and the auxiliary relay 35 decreases, and the power decreases. Therefore, the time required for the mechanical operation increases, and the time difference ΔTx increases. . When the internal temperature of the device decreases, the winding resistance of the trip coil 34 decreases, and the control current 15 increases. Therefore, the power increases, but the frictional resistance of the mechanical lock mechanism 33 increases. The time difference ΔTx changes by the minute. Such a degree of influence is experimentally obtained for each type of disconnector having a different structure, and the control value ΔT0 is finely set using the control voltage and the internal temperature of the apparatus as parameters. As a concrete setting method, there are a method of storing the control value ΔT0 for the fluctuation range of the control voltage and the internal temperature of the apparatus in a table format, and a method using a calculation formula. Further, the calculation judging section 44 fetches the control current waveform and the operation current waveform recorded by the recording section 43, obtains a time difference ΔTx at which the two start to flow, and calculates the time difference ΔTx.
Using the control voltage and the internal temperature of the apparatus in which Tx is recorded by the recording unit 43 as parameters, a preset management value {
The presence or absence of an abnormality is determined by comparing with T0. Next, the operation of the present invention configured as described above will be described. The operation power supply 14 of the electric motor 31 of the electric operation device 11 is always doubly shut off by the mechanical lock mechanism 33 and the contact 35 a of the auxiliary relay 35.
Further, the control power supply 13 is always shut off by the operation command push button 32. When the disconnecting switch body 10 is opened and closed, the operation command push button 32 is pressed to issue an opening or closing operation command, the control power supply 13 is turned on, and the control current 15 flows. As a result, the trip coil 34 is excited, the mechanical lock mechanism 33 is released, and the auxiliary relay 35 is also excited, so that the contact 35a is closed,
The operation power supply 14 is turned on. As a result, the operating current 16
Flows, and the electric motor 31 starts. The driving force of the electric motor 31 is transmitted to the disconnector main body 10 via the coupling mechanism 12,
The contact portion 2 of the disconnector main body 10 is opened and closed. In the above process, the control current 15 is detected by the control current detector 21 and the operation current 16 is detected by the operation current detector 22, and the detected control current waveform and operation current waveform are recorded by the recording unit. 23, and the operation timing is as shown in FIG. The two waveforms are compared and calculated by the calculation determination unit 24, and the time difference ΔTx at which the two flow start is obtained. The operation determining section 44 calculates the time difference △
Tx is compared with the control value ΔT0 to determine whether there is an abnormality. For example, if galling or kinking occurs in the mechanical lock mechanism 33, or if the exciting coil of the auxiliary relay 35 burns out, the timing at which the operation current 16 starts to flow is delayed,
Since the time difference ΔTx becomes large, the time difference ΔTx is out of the range of the management value ΔT0, and is determined to be abnormal. FIG. 4 shows an 84 kV 2000 A horizontal center one-point cutting device as a test device, in a normal state and in a state simulating an abnormality of the mechanical lock mechanism 33 of the electric operating device 11.
The control voltage and the operating voltage are both DC 100 V, and are waveform examples actually measured. The force required for releasing the mechanical lock mechanism 33 is about 4N (Newton) at normal time, and the time difference ΔTx1 at this time is about 130 ms as shown in FIG. If the force required for tripping is simulated to be about five times, the time difference ΔTx2 is greatly increased to about 290 ms as shown in FIG. 5 (B). . On the other hand, in this process, the control current 15 and the operating current 16 are detected by the control current detecting unit 21 and the operating current detecting unit 22, respectively. Temperature detector 2
6 and these are recorded in the recording unit 43. The control current waveform and the operation current waveform recorded by the recording unit 43 are compared and computed by the computation judging unit 44, and the time difference ΔTx at which the two start to flow is obtained. This time difference △
Tx is compared with the control voltage recorded by the recording unit 43 and the management value ΔT0 corresponding to the internal temperature of the apparatus, and it is determined whether there is an abnormality. Therefore, the time difference ΔTx is compared with the control value ΔT0 in which the control voltage and the internal temperature of the apparatus are set as parameters, so that a highly accurate abnormality diagnosis can be performed. Although the above embodiments have been described as applied to disconnectors, they can also be applied to other switches such as a grounding device. As described above, according to the present invention, the time difference between the start of the flow of the control current and the flow of the operation current is determined to diagnose the presence or absence of an abnormality, so that the diagnosis can be performed with higher reliability than before. It is possible to reduce troubles occurring until the next inspection. In addition, it is possible to save time and effort for urgent part replacement and readjustment, and to perform economical and rational maintenance and inspection.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing an embodiment of the present invention. FIG. 2 is a diagram showing details of the electric operating device. FIG. 3 is a diagram for explaining the operation timing. FIG. 4 is a diagram of operation timing obtained in an experiment using the embodiment of the present invention. [Description of Signs] 1 Conductive part 2 Contact part 3 Insulator part 4 Ground 10 Disconnector main body 11 Electric operating device 12 Connecting mechanism 13 Control power supply 14 Operation power supply 15 Control current 16 Operation current 21 Control current detection unit 22 Operation current detection unit 43 Recording unit 44 Operation determination unit 25 Control voltage detection unit 26 Temperature detection unit 31 Electric motor 32 Operation command push button 33 Mechanical lock mechanism 34 Release coil 35 Auxiliary relay

Continued on the front page (72) Inventor Emi Kawakami 1 Higashi-ku, Higashi-ku, Nagoya City, Aichi Prefecture Inside Chubu Electric Power Co., Inc. (72) Inventor Yoshikazu Wakita 2-14-14 Chiyoda, Naka-ku, Nagoya City, Aichi Prefecture Chubu Electric Power Company Inside the Chugoku Electric Power Center (72) Inventor Atsushi Shimoda Komaki City, Aichi Prefecture, 1010 Kubo Isshiki Tsukuda 1 Chubu Electric Power Co., Inc. Komaki Electric Power Center (56) Reference JP-A-2-281718 (JP, A) JP-A-61-26426 (JP, A) JP-A-61-102012 (JP, A) JP-A-6-260062 (JP, A) JP-A-4-82118 (JP, A) JP-A-1-212374 (JP JP, A) JP-A-9-120759 (JP, A) JP-A 1-155234 (JP, U) JP-A 3-30871 (JP, U) JP-A 2-17931 (JP, U) JP Hei 1-180824 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 33/00 H01H 33/36 G01R 31/00

Claims (1)

(57) [Claim 1] An electric operating device for a switch, comprising an electric motor, a control power supply and an operating power supply for controlling and driving the electric motor, wherein the electric motor performs an opening / closing operation of a switch body. A control current detection unit that detects a control current of the control power supply, an operation current detection unit that detects an operation current of the operation power supply, and a control voltage detection unit that detects a control voltage of the control power supply. A temperature detection unit that detects an internal temperature of the electric operating device; a control current waveform and an operation current waveform respectively detected by the control current detection unit and the operation current detection unit; and a temperature detection unit that is detected by the control voltage detection unit. A recording unit that records the control voltage and the internal temperature of the device detected by the temperature detection unit; and a flow of both the control current waveform and the operation current waveform recorded by the recording unit. Calculation time for determining the presence or absence of an abnormality by comparing the time difference with a preset management value using the control voltage and the apparatus internal temperature recorded by the recording unit as parameters. An abnormality diagnostic device for an electric operating device for a switch, comprising: