JPH10262349A - Electrostatic induction type power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply the power even when no current flows in applying the voltage by spirally winding an electrode around an insulation, and providing a rectification circuit on the secondary side while an input lead from the electrode and an input lead from a power cable conductor are the primary side. SOLUTION: A tape-like insulation 2 is spirally wound around a power cable conductor 3 in the vicinity of a shield case 5, and an electrode 1 is spirally wound around the insulation 2 in an overlapping manner. An input lead 14 is led from the electrode 1, an input lead 15 is led from the power cable conductor 3, the input lead 14 and the input lead 15 are the primary side input, and a rectification circuit 13 in which the secondary side is connected to a sensor 4 is stored in the shield case 5. The power can be supplied even when no current flows in applying the voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for supplying power to a sensor attached to a high voltage portion of a power line conductor in a substation premises.

[0002]

2. Description of the Related Art Conventionally, as a device for supplying power to a sensor attached to a high voltage portion of a power line conductor in a substation premises, a battery type power supply device having a battery inside the device and supplying power from the battery, There is a power supply CT type power supply device in which an iron core is linked to a power line conductor, a secondary winding is provided on the iron core, and power is supplied by utilizing an electromagnetic induction phenomenon. FIG. 3 is a view showing an example of the battery type power supply apparatus. 3 is a power line conductor, 4 is a sensor, 10 is a battery, and a battery 1 housed in a shield case 5 is shown.
Power is supplied to the sensor 4 from 0.

FIG. 4 is a view showing an example of the above-mentioned power supply CT type power supply device, wherein 3 is a power line conductor, 4 is a sensor,
Reference numeral 11 denotes an iron core and 12 denotes a secondary winding. When a current flows through the power line conductor 3, the iron core 11 is excited, a voltage is induced in the secondary winding 12, and power is supplied to the sensor 4.

[0004]

However, the battery type power supply has a drawback that it cannot be used continuously for a long period of time because the life of the battery 10 is short. On the other hand, the power supply CT-type power supply device has a disadvantage that the weight of the device is increased due to the use of the iron core 11 and an excessive weight load is applied to the power line conductor 3. In addition, since the power is supplied to the sensor 4 by utilizing the current flowing through the power line conductor 3, there is a disadvantage that the voltage cannot be supplied when the current is not flowing even when the voltage is applied. Therefore, an object of the present invention is to provide a power supply device that can be used continuously for a long period of time, is lightweight, and can supply power even when a voltage is applied and no current flows.

[0005]

According to the present invention, there is provided an insulator wound spirally around a power line conductor in a substation, an electrode wound spirally so as to overlap the insulator, and an input drawn from the electrode. A rectifier circuit having a lead and an input lead drawn from the power line conductor serving as a primary input and a secondary connected to a sensor.

As a result, an induced voltage is generated between the electrode and the power line conductor due to an electrostatic induction phenomenon between the ground, the electrode and the power line conductor, and the induced voltage is taken into the rectifier circuit by two input leads. By rectifying, power can be supplied to the sensor.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. Here, FIG. 1 is a diagram showing an example of an embodiment of the electrostatic induction type power supply device of the present invention, and FIG. 2 is a diagram for explaining the operation thereof. In FIG. 1, a sensor 4 is housed in a shield case 5 attached to a power line conductor 3 in a substation premises. A tape-shaped insulator 2 is spirally wound around the power line conductor 3 near the shield case 5. The electrode 1 is spirally wound so as to overlap the insulator 2.
The input lead 14 is pulled out from the electrode 1 and the input lead 15 is drawn out from the power line conductor 3. Electrode 1
A rectifier circuit 13 in which an input lead 14 drawn out of the power line conductor 15 and an input lead 15 drawn out of the power line conductor 3 are used as primary inputs and the secondary side is connected to the sensor 4 is connected to the shield case 5.
Is stored inside. A shield ring 6 is attached to the power line conductor 3 at the end opposite to the shield case 5. In addition, as the insulator 2, it is preferable to use a non-water-absorbing polymer.

Next, the operation of the above-described electrostatic induction type power supply device will be described with reference to FIG. When a voltage is applied to the power line conductor 3, an electrostatic induction phenomenon occurs between the ground 7, the electrode 1, and the power line conductor 3. At this time, due to the electrostatic induction phenomenon,
An AC voltage Vout is induced between the electrode 1 and the power line conductor 3. The AC voltage Vout is expressed as: Vout = V · C2
/ (C1 + C2). Here, V is the voltage between the power line conductor 3 and the ground 7, C1 is the capacitance between the electrode 1 and the power line conductor 3, and C2 is the capacitance between the electrode 1 and the ground 7. The current flowing due to the induced voltage Vout is taken into the rectifier circuit 13 by the input lead 14 and the input lead 15, converted into a direct current, and supplied to the sensor 4. The shield ring 6 reduces the electric field at the end of the electrode 1 to prevent corona discharge. As insulator 2
When a non-water-absorbing polymer is used, a stable capacitance C1 independent of environmental conditions such as moisture absorption can be secured, and a stable voltage can be obtained.

In order to increase the output of the above device,
The electrode 1 and the insulator 2 are spirally wound around the power line conductor 3 for increasing the surface area of the electrode 1. As a result, a power supply output required for the electrostatic induction power supply device can be obtained.

[0010]

As described above, the electrostatic induction type power supply device of the present invention can be used continuously for a long period of time because the output is extracted from the voltage of the power line conductor, and the iron core is unnecessary. In addition, since the weight can be reduced and the electrostatic induction phenomenon is used, power can be supplied even when no current is flowing through the power line conductor.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of an electrostatic induction type power supply device of the present invention.

FIG. 2 is a diagram illustrating the operation.

FIG. 3 is a diagram illustrating an example of a conventional battery-type power supply device.

FIG. 4 is a diagram illustrating an example of a conventional power supply CT type power supply device.

[Explanation of symbols]

 Reference Signs List 1 electrode 2 insulator 3 power line conductor 4 sensor 5 shield case 6 shield ring 7 ground 13 rectifier circuit 14 input lead 15 input lead C1 electrostatic capacitance between electrode 1 and power line conductor 3 C2 between electrode 1 and ground 7 Capacitance

Claims (1)

[Claims] 1. A power supply device for supplying power to a sensor attached to a high voltage portion of a power line conductor in a substation premises, comprising: an insulator wound spirally around the power line conductor; An electrode wound in a spiral shape, and a rectifier circuit in which an input lead drawn from the electrode and an input lead drawn from the power line conductor are used as primary inputs and a secondary side is connected to the sensor. Inductive power supply.