JP3840844B2 - Lightning surge detection device and switch equipped with the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lightning surge detection device that detects lightning to a switch, and more particularly to a lightning surge detection device that can determine the degree of deterioration of a switch based on the value of detecting a lightning strike.
[0002]
[Prior art]
Conventionally, this type of lightning surge detection device does not exist, and as a related one, there is a lightning arrester built-in type switch shown in FIG. This FIG. 5 shows the schematic block diagram of a lightning arrester built-in type switch. In the figure, a lightning arrester built-in type switch includes a lightning arrester 1 inside a switch 100, and the lightning arrester 1 applies an induction applied to a power supply distribution line 111 or a load side distribution line 112 which is a main circuit of the switch 100. In this configuration, an abnormal voltage caused by lightning is lowered and discharged to the ground GND side through the case 101. The lightning arrester 1 includes a varistor element 12 and a discharge gap 11 that are grounded in series.
[0003]
In a steady state where there is no lightning strike, the discharge gap 11 is always insulated and no voltage is applied to the varistor element 12. On the other hand, when a lightning surge voltage is generated due to a lightning strike, an abnormal current is passed through the varistor element 12 by discharging at the discharge gap 11, and the abnormal voltage is attenuated and limited by the non-linear resistance characteristic of the varistor element 12. .
[0004]
Thus, when a lightning surge occurs in the insulator 102 due to a lightning strike to the distribution line connected to the switch 100, an abnormal voltage due to the lightning strikes the main circuit of the distribution lines 100, 110 on the power supply side or the load side. When applied, the lightning arrester 1 attenuates the voltage level of the abnormal voltage, and discharges the attenuated abnormal voltage to the ground side.
[0005]
[Problems to be solved by the invention]
Since the conventional lightning arrester built-in switch is configured as described above, the abnormal voltage generated by the lightning strike can be attenuated and discharged to the ground GND side. There is a problem that the degree of deterioration cannot be detected and the degree of deterioration of the switch 100 due to the impact cannot be detected.
[0006]
In particular, it is extremely difficult to detect how much the switch 100 has deteriorated due to a plurality of lightning strikes, so it is impossible to know until a failure such as the switch 100 suddenly stops functioning. The broken switch 100 may induce a spillover to the entire distribution line.
The present invention has been made to solve the above-described problems, and an object thereof is to provide a lightning surge detection device capable of detecting the degree of deterioration of a switch due to a lightning strike.
[0007]
[Means for Solving the Problems]
A lightning surge detection device according to the present invention is a lightning surge detection device for detecting a lightning strike to a distribution line to which a switch is connected, and a lightning arrester for reducing an abnormal voltage generated by the lightning strike, and a voltage value of the abnormal voltage. a voltage detection unit for detecting, the comparison with the detected voltage value predetermined set voltage, and a number accumulation unit for accumulating the number of the lightning strike on the basis of the comparison result, the integration result of the count integration unit And a deterioration analogy unit that analogizes the degree of deterioration of the switch . As described above, in the present invention, an abnormal voltage due to a lightning strike to a distribution line to which a switch is connected is lowered by a lightning arrester, the abnormal voltage is detected by an abnormal voltage detection unit, and a lightning strike is detected based on the detected voltage value. The number of times is accumulated by the number accumulation unit, and the deterioration analogy unit can detect the degree of deterioration of the switch due to lightning strikes by estimating the degree of deterioration of the switch based on the result of accumulation of the number of lightning strikes. Ripple accidents can be prevented by detecting and replacing deteriorated switches .
[0009]
Further, in the lightning surge detection device according to the present invention, the voltage detector detects the voltage value of the abnormal voltage based on the light that discharges the abnormal voltage in the gap of the lightning arrester, as necessary. As described above, in the present invention, the voltage detection unit detects the voltage value of the abnormal voltage from the light emission due to the discharge generated in the gap of the lightning arrester, thereby reliably detecting the abnormal voltage and detecting the degree of deterioration of the switch. Can do.
[0010]
In addition, the lightning surge detection device according to the present invention integrates values weighted to a plurality of stages by the number of times accumulation unit as the number of lightning strikes as necessary. As described above, in the present invention, since the number accumulating unit accumulates values weighted in a plurality of stages depending on the magnitude of the abnormal voltage as the number of lightning strikes, the degree of impact received by the switch due to the magnitude of the lightning strike is taken into consideration. The degree of deterioration of the switch can be detected.
[0011]
Further, in the lightning surge detection device according to the present invention, the number integration unit sets a plurality of set voltages as necessary, and integrates the number of lightning strikes for each comparison result of the plurality of set voltages. As described above, in the present invention, a plurality of set voltages and abnormal voltages are compared, and the number of lightning strikes for each comparison result is accumulated by the frequency accumulating unit. It is possible to detect and judge the degree of deterioration of the switch.
[0012]
The lightning surge detection device according to the present invention includes communication means for transmitting at least one of a voltage value of an abnormal voltage, an integrated number of lightning strikes, or an estimated degree of deterioration as necessary. As described above, in the present invention, various information related to lightning strikes is detected or analogized and transmitted via communication means. Therefore, the occurrence of lightning surges and the deterioration of switches and arresters are installed in the switch. Even a place away from the site can be immediately grasped and analyzed, and it becomes easy to determine the replacement time at an early stage.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment of the present invention)
Hereinafter, a lightning surge detection apparatus according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2A. FIG. 1 is an overall block configuration diagram according to this embodiment, and FIG. 2 (A) is a detailed circuit block diagram of a circuit integration unit in the lightning surge detection device shown in FIG.
[0014]
In each of the above drawings, the lightning surge detection device according to the present embodiment reduces an abnormal voltage generated by a lightning strike applied to the load side distribution line 112 (or the power supply side distribution line 111) of the main circuit introduced into the switch. The lightning arrester 1 to be detected, the voltage detector 2 for detecting the voltage value of the abnormal voltage, the detected voltage value is compared with a preset voltage, and the number of lightning strikes is integrated based on the comparison result. The number of times integration unit 3 and a deterioration analogy unit 4 for estimating the degree of deterioration of the switch based on the integration result of the number of times integration unit 3 are provided.
[0015]
The lightning arrester 1 is configured by connecting a varistor element 12 and a discharge gap 11 in series as in the prior art. The voltage detection unit 2 includes one or a plurality of photoelectric conversion units 21 that receive light emitted by an abnormal voltage due to discharge in a discharge gap 11 of a switch, and an electric signal converted by the photoelectric conversion unit 21 Is output to the number integration unit 3.
[0016]
The number accumulation unit 3 includes an amplifier 31 that amplifies the voltage value of the abnormal voltage detected by the voltage detection unit 2 with a predetermined amplification factor, a comparator 32 that compares the amplified voltage value with a set voltage, A set voltage memory 33 that presets and stores a set voltage, a counter 34 that accumulates the number of lightning strikes based on the comparison result of the comparator 32, and an output relay that outputs the comparison result to a control unit (not shown). 35.
[0017]
Next, the operation of the present embodiment based on the above configuration will be described. First, when a lightning surge voltage is generated in the bushing of the switch due to the induced lightning of the distribution line, the abnormal voltage is superimposed on the load (or power supply side) distribution line 112 (or 111) that is the main circuit of the switch. Applied.
This abnormal voltage is discharged in the discharge gap 11 of the lightning arrester 1, and the voltage generated by this discharge is lowered by the varistor element 12 and conducted to the ground side.
[0018]
The photoelectric converter 21 of the voltage detector 2 receives the arc emitted by the discharge gap 11 and converts it into an electrical signal, and outputs a voltage having a magnitude corresponding to the degree of the arc. This output voltage is input to the comparator 32. The comparator 32 reads the set voltage from the set voltage memory 33 and compares it with the output voltage. If the output voltage is equal to or higher than the set voltage, there is a lightning strike. Output as stuff.
[0019]
The outputs of the comparator 32 are integrated by the counter 34 and output to the deterioration analogy unit 4. The degradation analogy unit 4 can determine the degree of degradation of the switch based on the contents of the integrated output and notify the supervisor or the monitoring center via a communication line, a telephone line, a PHS, or the like.
[0020]
(Second embodiment of the present invention)
FIG. 2B shows a detailed block circuit diagram of the number-of-times integrating unit in the lightning surge detector according to the second embodiment of the present invention. In the same figure, the lightning surge detection device according to the second embodiment is similar to the lightning surge detection device described in FIG. 1, with a lightning arrester 1, a voltage detection unit 2, and a frequency integration unit 30 (FIGS. 1 and 2A). Is equivalent to 3), the deterioration analogy unit 4 is provided in common, and the circuit configuration of the number integrating unit 30 is different.
[0021]
In addition to the amplifier 31, the comparator 32, the set voltage memory 33, and the counter 34, the number accumulating unit 30 stores a plurality of set voltages in the set voltage memory 33, and generates lightning strikes according to the comparison result of the comparator 32. It is the structure provided with the weighting part 36 which weights the frequency | count.
Next, the operation of the lightning surge detector according to this embodiment based on the above configuration will be described. When an abnormal voltage due to a lightning strike is input to the frequency integration unit 30 via the load side (or power supply side) distribution line 112 (or 111), the lightning arrester 1, and the voltage detection unit 2 as in the above embodiment, the frequency integration unit. 30 amplifies the input detection voltage by an amplifier 31 and compares it by a comparator 32. The comparator 32 reads the set voltage from the set voltage memory 33 in which a plurality of set voltages are stored, compares the detected voltages, and outputs a comparison result corresponding to the plurality of set voltages.
[0022]
Based on the comparison results corresponding to the plurality of set voltages, the weighting unit 36 weights and outputs the number of lightning strikes. The weighting unit 36 assigns a large weighting value in the order of a plurality of setting voltages. For example, when the setting voltage is a value of 5 levels, the weighting values are 5 · 4 · 3 · 2 · 1 in the descending order. Become. The weighting value may be a numerical value that increases exponentially such as 11, 7, 4, 2, 1, etc. That is, the greater the number of lightning strikes, the more exponential the impact on the switch will be, thus increasing the apparent number of lightning strikes.
[0023]
Thus, the deterioration of the switch can be estimated by counting the number of lightning strikes weighted by the weighting unit 36 from the output of the counter 34.
In each of the above embodiments, the voltage detection unit 2 is configured to detect an abnormal voltage based on an arc in the discharge gap 11 of the lightning arrester 1. However, the magnetic field is detected by CT through which the preceding or intermediate line of the lightning arrester 1 penetrates. In other words, an abnormal voltage can be detected.
[0024]
Further, as shown in FIG. 3, the detection device main body provided outside the switch 100 receives an electrical signal from the photoelectric conversion unit 21 installed in the vicinity of the discharge gap 11 of the lightning arrester 1 provided in the switch 100. It is also possible to output from the signal output unit 22 to the side. As described above, a signal is transmitted from the lightning surge detection device to the manager or the monitoring center via the communication unit 7 every time a lightning surge occurs or based on the contents of the integrated output. As the communication means 7, a coded information signal such as a lightning surge level, the number of occurrences, and the date and time of occurrence is transmitted through a communication line or using wireless communication such as a general telephone line or a PHS line. Based on the received signal, the monitoring center can grasp the deterioration state of the lightning arrester 1 installed in the body of the switch 100 or built-in or externally, analyze the data, and determine the replacement time.
[0025]
In addition, as shown in FIG. 4, the detection device main body is housed and disposed in the case 101 of the switch 100, and the display unit 5 may be configured to notify the number of lightning strikes detected by the detection device main body. it can. In this way, the number of lightning strikes on the switch 100 is individually displayed on the display unit 5 and can be visually recognized, so that the degree of deterioration of each switch 100 can be determined.
[0026]
Moreover, although the lightning surge detection device according to each of the above embodiments is attached to or built in the switch 100, the device of the administrator or the like without being attached to or built in the switch 100. It can also be arranged in a monitoring center. In other words, the switch 100 is provided with only the lightning arrester 1 and the voltage detector 2 sensor, and the voltage value of the abnormal voltage from the sensor is transmitted to the manager or the management center to detect the lightning surge. it can. In this case, the voltage value of the abnormal voltage sequentially transmitted from the plurality of switches 100 can be processed by a single administrator or the monitoring center side.
[0027]
【The invention's effect】
In the present invention, an abnormal voltage caused by a lightning strike on a distribution line to which a switch is connected is lowered by a lightning arrester, detected by the abnormal voltage detection unit, and the number of lightning strikes is integrated by a frequency integration unit based on the detected voltage value. In addition, by estimating the degree of deterioration of the switch by the deterioration analogy unit based on the result of integration by the frequency integration unit, it is possible to detect the degree of deterioration received by the switch due to lightning strikes and By detecting and replacing, it has the effect of preventing spillover accidents .
[0029]
Further, in the present invention, the voltage detector detects the abnormal voltage value from the light emission due to the discharge generated in the gap of the lightning arrester, so that the abnormal voltage can be reliably detected and the degree of deterioration of the switch can be detected. It has the effect of being able to.
In addition, the lightning surge detection device according to the present invention integrates values weighted to a plurality of stages by the number of times accumulation unit as the number of lightning strikes as necessary. As described above, in the present invention, since the number accumulating unit accumulates values weighted in a plurality of stages depending on the magnitude of the abnormal voltage as the number of lightning strikes, the degree of impact received by the switch due to the magnitude of the lightning strike is taken into consideration. This has the effect that the degree of deterioration of the switch can be detected.
[0030]
Further, in the present invention, a plurality of set voltages and abnormal voltages are compared, and the number of lightning strikes for each comparison result is accumulated by the frequency accumulator, so the lightning intensity is divided into a plurality of stages. This has the effect that the degree of deterioration of the switch can be detected.
Furthermore, in the present invention, various information related to lightning strikes is detected or analogized and transmitted via communication means. Even if it is away from the location, it can be immediately grasped and analyzed, and it is easy to determine the replacement time at an early stage.
[Brief description of the drawings]
FIG. 1 is an overall block configuration diagram of a lightning surge detector according to a first embodiment of the present invention.
2A is a detailed circuit block diagram of a circuit integration unit in the lightning surge detection device shown in FIG. 1; FIG.
FIG. 3B is a detailed block circuit diagram of a frequency accumulating unit in the lightning surge detection device according to the second embodiment of the present invention. FIG. 3 shows a detection device body of the lightning surge detection device according to another embodiment of the present invention. It is the whole schematic block diagram arranged outside the case of a switch.
FIG. 4 is an overall schematic configuration diagram in which a lightning surge detector according to another embodiment of the present invention is housed in a switch and a display unit is added.
FIG. 5 is a schematic configuration diagram of a lightning arrester built-in type switch.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lightning arrester 2 Voltage detection part 3, 30 Count accumulation part 4 Degradation analogy part 5 Display part 7 Communication means 11 Discharge gap 12 Varistor element 21 Photoelectric conversion part 22 Signal output part 31 Amplifier 32 Comparator 33 Setting voltage memory 34 Counter 35 Output relay 36 Weighting unit 100 Switch 101 Case 102 Insulator 111 Power supply side distribution line 112 Load side distribution line

Claims (6)

In the lightning surge detection device that detects lightning strike to the distribution line connected to the switch,
A lightning arrester that reduces the abnormal voltage generated by the lightning,
A voltage detector for detecting a voltage value of the abnormal voltage;
Comparing the detected voltage value with a preset setting voltage, and integrating the number of times of the lightning strike based on the comparison result ;
A lightning surge detection device comprising: a deterioration analogy unit that analogizes a degree of deterioration of a switch based on an integration result of the frequency integration unit . In the lightning surge detection device according to claim 1,
The lightning surge detector according to claim 1, wherein the voltage detector detects a voltage value of the abnormal voltage based on light discharged from the abnormal voltage in a gap of the lightning arrester . In the lightning surge detection device according to claim 1 or 2,
A lightning surge detection device that accumulates values weighted in a plurality of stages by the number-of-times integration unit as the number of lightning strikes . In the lightning surge detection device according to any one of claims 1 to 3,
The lightning surge detection device, wherein the number integration unit sets a plurality of set voltages and integrates the number of lightning strikes for each comparison result of the plurality of set voltages . In the lightning surge detection device according to any one of claims 1 to 4,
A lightning surge detection apparatus comprising: a communication unit that transmits at least one of the abnormal voltage value, the number of lightning strikes, or the estimated degree of deterioration to a monitoring side . The lightning surge detection device according to any one of claims 1 to 5 is provided.
Features a switch.

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