JPS5817261Y2 - Overhead distribution line fault point display device - Google Patents

Description

[Detailed explanation of the invention] This invention is designed to immediately display the point where a large line current suddenly flows in a high-voltage or low-voltage overhead distribution line due to a short circuit, etc., so that an inspector can come to the scene. This relates to a fault point display device for overhead power distribution lines that is capable of informing inspectors that ``there is no accident here'' upon arrival.

In recent years, in the case of a short-circuit accident occurring in a high-voltage or low-voltage overhead power line, it has become particularly desirable to discover the point of the accident at an early stage and to promptly perform recovery from the accident.

However, currently, when an accident occurs on the distribution line and current flows, the overcurrent relay at the substation is tripped, and the OCB trips, resulting in a power outage, the power outage covers a wide area and it takes a lot of time to find the fault point. , and long power outages were unavoidable.

Therefore, this proposal is proposed in view of the above points.If a short-circuit current exceeding a set value flows (passes) through the distribution line, this is detected and the fault point is immediately displayed on the overhead distribution line. The present invention aims to provide an accident point display device.

The drawings showing the embodiments of the present application will be described below.

In FIGS. 1 to 3, 1 is a road, 2 is a utility pole, and 3 is a high-voltage power distribution line shown as an example of an overhead power distribution line.

Next, 4 indicates an accident point display device attached to each utility pole 2,
They are attached to distribution lines near major branch points and intermediate points of high-voltage distribution lines.

This accident point display device 4 consists of a detection section 5 installed on the high voltage distribution line 3 and a main body 6 attached to the utility pole 2, as clearly shown in FIG.

Next, the configuration will be explained in detail based on FIG. 3.

First, in the detection unit 5, 7 is an iron core, and 8 is a coil wound around the iron core 7, which detects the magnetic flux generated around the high-voltage distribution line 3 by the current flowing through it, and generates an output signal corresponding to the magnetic flux. It is configured.

5a and 5b indicate output ends, which are connected to the main body 6.

Next, in the main body 6, numeral 9 indicates a discrimination circuit, which is a circuit designed to discriminate whether the signal coming from the detection section 5 is a normal signal or an abnormal signal.

In this circuit 9, 10 is an isolation transformer (pulse transformer), 10a is its primary winding, and 10b is its secondary winding.

1'1.1'1 is a Zener diode whose Zener voltage is selected to be higher than the voltage that enters from the detection unit 5 and is applied to the eye body during normal operation.

12 is a variable resistor for adjusting the current flowing through the primary winding 10a of the transformer 10.

Next, reference numeral 13 indicates a rechargeable battery, for example a nickel cadmium storage battery.

Note that any type of battery, such as a dry type or a wet type, can be used as this battery.

14 is a light emitting diode exemplified as a notification means.

Next, 15 shows a switching circuit interposed in the closed circuit between the battery 13 and the diode 14, and in this circuit, 16
is a switching element, for example, Cyrisk is used.

Further, the gate of this element 16 is connected to the secondary winding 1 of the transformer 10.
0b so that it can be driven.

Reference numeral 17 indicates a resistor for protecting the gate of the switching element 16.

Next, 18 shows a charging circuit, and in this circuit, 19 is a rectifying diode, and 20 is a current limiting resistor, which has a high resistance value.

Note that this charging circuit 18 is connected to the primary winding 10 of the transformer 10.
a and the variable resistor 12, but it may be directly connected to the detection section without going through these.

In the above configuration, when a normal current is flowing through the high voltage distribution line 3, the detection section 5 picks up the magnetic flux due to the current, and the detection section 5 sends out a normal signal.

This signal is input to the discrimination circuit 9 in the main body 6.

However, at this time, since the voltage applied to the Zener diode 11 does not exceed the Zener voltage, no current flows through the Zener diode 11, and therefore the following abnormal operation is not performed.

Next, when there is a short-circuit accident in the high-voltage distribution line 3 and an excessive current flows, an abnormally large magnetic flux is generated around the distribution line 3.

This magnetic flux is detected by the detection unit 5, and its output end 5a,
An abnormality signal is sent from 5b to main body 6.

At this time, since a voltage higher than the Zener voltage is applied to both ends of the Zener diode 11 in the discrimination circuit 9, the Zener diode 11 becomes conductive, and a current flows through the primary winding 1'Oa of the transformer 10.

Due to this current, a signal also appears in the secondary winding 10b of the isolation transformer 10.

This signal is transmitted to the switching element 16 via the protective resistor 17.
join the gate.

Then, the switching element 16 becomes conductive.

Due to this conduction of element 16, current from battery 13 flows to light emitting diode 14 and switching element 16.

As a result, the light emitting diode 14 lights up to notify that a short circuit accident has occurred.

Such notification is made for a certain period of time (for example, 3 hours,
This time is determined by the capacity of the battery 13.

) has passed, the power of the battery 13 is consumed and it becomes impossible to maintain the conduction state of the switching element 16,
The switching element 16 enters the cut-off state.

As a result, no current flows through the light emitting diode 14, and the light emitting diode 14 turns off.

Next, when the short-circuit accident is resolved and a normal current begins to flow through the distribution line 3, a normal signal is sent from the detection section 5 to the main body 6 as described above.

Then, the signal is applied to the storage battery 13 via the primary winding 10a of the transformer 10 or the variable resistor 12, and further via the charging path 18, and the storage battery 13 is sequentially charged to indicate the next short circuit accident. Be prepared.

In addition, in the case where there is a short circuit accident as described above and the light emitting diode 14 emits light to notify the short circuit accident, if normal current starts to flow through the high voltage distribution line 3 before the battery 13 has run out of power, Also, the light-emitting diode 14 is turned off again in the following manner.

That is, the normal signal sent from the detection section 5 is transmitted to the main body 6.
It is applied to the charging circuit 18 via the primary winding 10a of the transformer 10 or the variable resistor 12.

However, since the current limiting resistor 20 with a high resistance value is used in this charging circuit 18, the current flowing through this charging circuit 18 is extremely small, which is less than the minimum holding current of the switching element 16.

Therefore, even with such a small current passing through the charging circuit 18, the power of the battery 13 is continuously consumed to light the light emitting diode 14.

When the power of the battery 13 is consumed and it becomes impossible to maintain the conduction state of the switching element 16, the light emitting diode 14 is turned off as described above.

After this happens, the battery 13 is charged in the same manner as described above.

Next, when there is a short-circuit accident in the distribution line, the fault point can be searched as follows.

That is, as shown in FIG. 1, an inspector travels on a road 1 in a car 21.

At this time, the lighting state of the light emitting diode 14 of the accident point display device 4 attached to each utility pole 2 will be checked.

Then, for example, in all the display devices 4°4... up to the display device 4 at the point A, the light emitting diode 1
4 are all lit, and subsequent display devices 4, 4, and
..., it is confirmed that the light emitting diode 14 is turned off.

Therefore, in this case, it is easily confirmed that the short circuit accident occurred near the point indicated by A.

In addition to being attached in the state shown in FIG. 2, the detection section 5 can be attached in any state as long as it can detect the magnetic flux generated by the current flowing through the distribution line 3.

Also, instead of using a light emitting diode as the notification means,
Mechanical means, such as a structure in which a display piece protrudes, may also be used.

Next, FIG. 4 shows a different embodiment of the present application, and shows a circuit in which a switching element is triggered without using a transformer as described above.
Its operation is substantially similar to that of the circuit shown in FIG. 3 above.

Note that 22 indicates a protective resistor.

In addition, in this circuit, parts that are functionally the same or equivalent to those in the previous figure are given the same reference numerals and the letter e, and redundant explanations are omitted.

As described above, in the present invention, the normal magnetic flux from the power distribution line 3 or the abnormal magnetic flux that increases during abnormal times is input to the detection section 5, and the signal sent from the detection section 5 based on this is input to the discrimination circuit. 9, and then operates the switching circuit 15 only in the event of an abnormality to activate the notification means 14 to enable accident notification. When an accident occurs and a large current flows temporarily, the abnormal state can be easily detected and the notification means 14 can be activated immediately to display the accident.

This means that when a short-circuit accident occurs in the overhead power distribution line 3, an inspector who arrives at the scene some time later (for example, 3 hours or 1 hour later) finds the accident display on the notification means 14, and detects the fault. This has the advantage of making it easier to find the accident point because the location can be detected quickly.

Moreover, in this case, since the battery 13 that maintains the accident display state of the notification means 14 has a rechargeable structure, the power consumed when displaying the accident as described above is automatically replenished after the accident is recovered. It has the following characteristics.

That is, the detection unit 5 always has human power under the influence of the normal current from the overhead distribution line, and by supplying this input energy to the battery 13 via the charging circuit 18,
As mentioned above, the power consumed by the accident display can be stored, and as a result, even if an accident display is performed, it is not necessary to replace the battery every time, which is very useful in terms of maintenance. There is a ratio.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application; Fig. 1 is a perspective view showing an inspection state, Fig. 2 is a perspective view of main parts showing an installed state, and Fig. 3 is a perspective view showing an installed state.
The figure is a circuit diagram, and FIG. 4 is a circuit diagram showing a different embodiment. 3... Overhead distribution line, 5... Detection section, 9
...Discrimination circuit, 13...Battery, 14.
...Notification means, 15...Switching circuit, 18...Charging circuit.

Claims (2)

[Scope of utility model registration request] (1) A detection section installed on a power distribution line to detect magnetic flux emitted from the distribution line, an input end of which is connected to the output end of the detection section, and a detection section that is connected to the output end of the detection section; It is equipped with a discriminating circuit that discriminates between a normal signal and an abnormal signal input from the above-mentioned detection section, and a battery configured to be rechargeable, and connected to both ends of the battery. It is equipped with a notification means capable of displaying a display, and a switching circuit interposed in a closed circuit between the battery and the notification means, and an output end of the discrimination circuit is connected to the switching circuit to receive an abnormal signal from the discrimination circuit. The battery is characterized by comprising a charging circuit configured to close the switching circuit when a signal is sent, and which is configured to take in the signal sent from the detection section and store energy in the battery at all times. Fault point display device for overhead power distribution lines. (2) The charging circuit is characterized by interposing a rectifying element and a current limiting element that limits the flow of current into the switching circuit and slightly allows the flow of current into the battery. A fault point display device for an overhead power distribution line as set forth in claim 1 of the utility model registration claim.