JPH011973A - Switching abnormality detection device for tap switching device under load - 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]

[Industrial Application Field 1] The present invention relates to a switching abnormality detection device for an on-load tap changer, which detects switching abnormalities such as overcurrent switching in the on-load tap changer. [Prior Art] Fig. 3 is a perspective view showing a built-in type on-load tap changing device for a transformer as an example of a conventional on-load tap changing device, and Fig. 4 is a configuration diagram of the switching switch shown in #s3. In the figure, a switching switch (2) that opens and closes the current in the circuit and a tap selector (3) that selects the current to open and close are housed in the insulating oil in the transformer tank (1). Since the switching mm switch (2) contaminates the insulating oil in the transformer tank (1), it is placed in an insulating container with an oil ffi structure. This switching switch (2)
A plurality of fixed contacts (4) are arranged concentrically inside the housing. A switching shaft (5) is provided at the center of this concentric circle. Three movable contacts (6) are provided in three directions from the switching shaft (5), and these three movable contacts (6) can each rotate 120 degrees around the switching shaft (5). This allows the fixed contact (4) to be contacted to be changed. A current limiting resistor (7) is provided inside the switching switch (2) to limit the circulating current flowing between the taps when switching the taps. Above the transformer tank (1), there is insulating oil to ensure that there is always enough insulating oil in the switching switch (2) even if the oil level in the switching switch (2) changes due to temperature changes. A conservator (8), which is a tank, is provided via piping (9). An IJ relay 10) which is a switching abnormality detection device is provided in the middle of the pipe (9). At the top of the conservator (8), a discharge pipe (11) is provided for discharging the gas generated inside the switching switch (2) into the atmosphere. There is a pressure relief plate (1) on the top of the switching switch (2).
2) is provided, and this pressure relief plate (12) protects the switching switch (2) from damage by breaking the pressure relief plate (12) in the event of a sudden pressure increase due to gas generation during abnormal switching. It looks like this. In such a conventional on-load tap changing device, an arc (13) is generated between the fixed contact (4) and the movable contact (6) when changing the tap, and this arc (13) causes the insulating oil to leak. Some of it turns into gas. This gas is carried through the insulating oil from the pipe (9) through the protective relay (10) to the conservator (8) and is discharged into the atmosphere through the discharge pipe (11). At this time, a 17 leak (10) occurs, but the large amount is detected by the flow rate of the insulating oil flowing inside the pipe (9). This protective relay (10) depends on the switching during normal operation, but it does not operate in a large outbreak, but due to switching abnormalities such as overcurrent switching, damage to the switching contact, damage to the current limiting resistor (7), and delay in switching time, a large amount of If this gas is generated in the switching switch (2), it will be detected and an alarm will be issued to notify you of a switching abnormality. When the protective relay (10) issues an alarm, you must immediately stop the transformer, lift the switching switch (2) from the transformer tank (1), and inspect the inside of the switching switch (2). No. [Problems to be Solved by the Invention] In the conventional switching abnormality detection device for a tap changer under load as described above, a large number of switching errors (10) occur, but the switching abnormality is indirectly caused by switching open/close. Since the detection is performed outside the switch (2), it takes time for the protective relay (10) to issue an alarm after a switching error occurs, and during that time, the switching switch (2) remains in the switching error state. Since the device is left unattended, there is a problem in that by the time a switching abnormality is detected, the damage to the on-load tap switching device has already increased. This invention was made to solve the above problems, and provides an on-load tap switching device that can detect switching abnormalities in a short time and can reduce damage to the on-load tap switching device due to switching abnormalities. The purpose of this invention is to obtain a switching abnormality detection device. [Means for Solving the Problems] A switching abnormality detection device for an on-load tap switching device according to the present invention includes providing an optical fiber in a switching switch for transmitting the light of arc discharge generated during tap switching as an optical signal, and A switching abnormality monitoring means is provided outside the switching switch and is connected to an optical 7-eyeper to monitor abnormalities in tap switching using optical signals transmitted through optical fibers. [Function 1] The switching abnormality detection device of the tap switching device under load according to the present invention uses an optical fiber to detect a switching error of 1 m when switching taps.
The light of the arc discharge generated in the closing device is transmitted as an optical signal to the switching abnormality monitoring means, and the switching abnormality is detected. [Embodiment 1] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a block diagram showing a switching switch of an on-load tap changer of a transformer showing an embodiment of the present invention, and Fig. 2 is a block diagram showing a switching abnormality detection device of the on-load tap changer of Fig. 1. The same or equivalent parts as in FIG. 13 and FIG. 4 are designated by the same reference numerals, and the explanation thereof will be omitted. In the figure, on the outer periphery of a plurality of fixed contacts (4) arranged on a concentric circle, there is an optical fiber (14) which is an insulator and which senses light in its vertical cross section. The same number of entrance ports as the fixed contacts (4) are provided facing the fixed contacts (4). A plurality of optical fibers (14) are connected to one optical 7 eye bar code (15) provided in the switching switch (2), and this optical 7 eye bar code (15) is connected to the switching switch (2).
) is drawn out to the outside of the switching switch (2) through a puffing (not shown) provided on the wall of the switch (2). The optical fiber bar code (15) drawn out to the outside of the switching switch (2) is a component of switching abnormality monitoring means and is connected to a converter (16) that converts an optical signal into an electrical signal. In the device (16), there are 7 otodiodes (P
D) and seven baluns and seven otodiodes (eight PDs) are used. The converter (16) is electrically connected to a monitor (17) which is a component of the switching abnormality monitoring means. In such a switching abnormality detection device for a tap switching device under load, the light from the arc (13) generated at the time of tap switching enters the optical fiber (14), and the likely intensity and occurrence time are recorded as an optical fiber code in the form of an optical signal. (15) and is transmitted to the outside of the switching switch (2). Since this optical signal cannot be processed by the monitor (17) as an optical signal, it is first converted into an electrical signal through the converter (16), amplified and A/D converted, and then processed by the monitor (17).
7). The transmitted digital electrical signal is compared and examined with a previously input normal electrical signal in a microcomputer installed in the monitor (1). If it is determined that there is an abnormality, the monitor (17) outputs a 5TOP signal to the transformer to stop the transformer and also informs the outside of the abnormality. Additionally, if it is determined to be normal, monitoring will continue. In the above embodiment, an optical fiber bar cord (15) was used, but an optical fiber cable may also be used.Also, in the above embodiment, an optical fiber (14) that senses light only in its vertical cross section is fixedly connected. The one with the same number of fibers as (4) is a light 7 fiber that can sense light on the side.
One may be provided so as to pass near each of the plurality of contact points of the fixed contact (4) and the movable contact (6).

【Effect of the invention】

As explained above, the switching abnormality detection device of the on-load tap switching device according to the present invention includes an optical fiber that transmits light due to arc discharge generated during tap switching as an optical signal in the switching interval rR'f#, and Switching abnormality monitoring means is installed on the outside of the device to monitor abnormalities in tap switching by connecting to an optical fiber, and switching abnormalities are directly detected by electrical discharge, making it possible to detect switching abnormalities in a short time. Therefore, damage to the tap switching device under load due to switching abnormality can be reduced.

[Brief explanation of drawings]

Fig. Pt51 is a block diagram of a switching switch of an on-load tap changer showing an embodiment of the present invention, Fig. 2 is a block diagram of a switching abnormality detection device of the on-load tap changer shown in Fig. 1, and Fig. 3
The figure is a perspective view of a conventional built-in on-load tap changer for a transformer, and Figure 4 is a configuration diagram of the switching switch shown in Figure 3. In the figure, (2) is a switching switch, (13) is an arc,
(14) is an optical fiber, (15) is an optical fiber bar code, (16) is a converter, and (17) is a monitor. In each figure, the same reference numerals indicate the same or corresponding parts. Trap IUXU Ryo 4 figure

Claims (2)

[Claims] (1) An optical fiber provided in a switching switch of an on-load tap switching device and transmitting light due to arc discharge generated during tap switching to the outside of the switching switch as an optical signal; and an optical fiber installed outside the switching switch. A switching abnormality detection device for a tap switching device under load, comprising: switching abnormality monitoring means for monitoring switching abnormality in tap switching using an optical signal connected to the optical fiber and transmitted by the optical fiber. (2) The switching abnormality monitoring means consists of a converter that converts an input optical signal into an electrical signal and outputs it, and a monitor that monitors switching abnormalities using the electrical signal output from the converter. A switching abnormality detection device for an on-load tap switching device according to claim 1.