JP2002311079A - Ground fault and short circuit indicator device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dispense with an external power source and simplify structure in a ground fault and short circuit indicator device. SOLUTION: An electric equipment container 1 housing a charging part 2 is internally mounted with a photoelectric transducing part 4 comprising a solar cell or the like. The photoelectric transducing part 4 is connected to an indicator 6 outside the container. The indicator 6 comprises an electrochemical integrating element, which is formed from a material that develops an oxidation-reduction reaction and changes in color when voltage is applied thereto. The arrangement can dispense with an external power source and simplify the structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting and displaying a ground fault or a short circuit occurring inside an electric device.

[0002]

2. Description of the Related Art Electrical equipment such as a gas insulated switchgear (GIS) accommodates a high-voltage charging unit in a container. When a ground fault or short circuit occurs in this container, an arc light is generated due to the ground fault or short circuit. Conventionally, this arc light is detected by a light collecting glass and transmitted to the outside of the container by an optical fiber. Then, the optical signal is converted into an electric signal by a photodiode or the like, and when the electric signal exceeds a predetermined value, the occurrence of an accident is indicated on a display. The maintenance person determines that a ground fault or a short circuit accident has occurred inside the electrical equipment container by looking at the display on the display.

[0003]

In the above conventional method,
Since optical components such as light-collecting glass and optical fiber are used, the system is complicated and expensive. Also,
A circuit that determines the presence or absence of an accident based on an optical signal and displays the signal requires an external power supply. SUMMARY OF THE INVENTION It is an object of the present invention to provide a ground fault / short circuit display device that does not require an external power supply and has a simple structure.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object. In the present invention,
A photoelectric conversion unit for inducing a voltage when an arc light due to a ground fault or a short circuit is detected is provided in a container housing the high-voltage charging unit. This photoelectric conversion unit is connected to a display unit provided outside the container. This display unit is constituted by an electrochemical integration element connected to the photoelectric conversion unit, and when a voltage is applied, an oxidation-reduction reaction occurs to change color.

When a ground fault or short circuit occurs in the container and the photoelectric conversion unit detects arc light due to the ground fault or short circuit, a voltage corresponding to the intensity of the arc light is generated, and the voltage is applied to the display unit. . This causes the display to change its color. Also,
The color remains changed even after the application of the voltage by the photoelectric conversion unit is stopped. Therefore, ground fault in the container,
When a short circuit occurs, the display unit keeps the display state, so that even after a lapse of time after the occurrence of a ground fault or short circuit, it is easy to detect the occurrence of a ground fault or short circuit in the electrical equipment container. You can know. According to the present invention,
A ground fault or short circuit display device having a simple structure including only the photoelectric conversion unit and the display unit and requiring no external power supply can be obtained.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a GIS will be described with reference to the drawings. (Embodiment 1) FIG. 1 shows a configuration of a first embodiment in which the present invention is applied to a GIS (gas insulated switchgear).

In the GIS, an insulating gas such as SF6 gas is sealed in a container 1, and a charging section 2 to which a high voltage is applied is housed in the insulating gas atmosphere. The container 1 is formed in a cylindrical shape, and the charging unit 2 is a three-phase conductor arranged along the axial direction of the container 1 and receives a high voltage. FIG. 1 is a sectional view of the container 1 in a direction perpendicular to the axial direction. The storage part 3 is formed in a part of the container 1, and the storage part 3 is hermetically sealed with a lid 4 on the outside and a shield 5 on the inside. Shield 5
Is formed of a mesh-like metal net or the like, and
The inside of the storage unit 3 is shielded from light, and light generated in the container 1 passes through the storage unit 3.

A photoelectric conversion unit 6 is attached to the storage unit 3 with the light receiving surface facing the container 1. As the photoelectric conversion unit 6, a solar cell, a solar cell, a photocell, or the like can be used. The light-receiving surface of the photoelectric conversion unit 6 is coated with a light-transmitting insulating material 7 such as a transparent epoxy resin. A sealing terminal 8 is provided on the lid 4, and the photoelectric conversion unit 6 is connected to a display 9 provided outside the container 1 through the sealing terminal 8.

The display 9 is constituted by an electrochemical integrating element. This electrochemical integration element is formed of a material that undergoes an oxidation-reduction reaction and changes color when a voltage is applied. Lid 4
A container 10 for accommodating the display 9 is provided outside the device.
A glass 11 plate is disposed at an end of the container 10 so that the display 9 can be visually observed from the outside. When a ground fault 12 or a short circuit occurs in the container 1, an arc light 13 is generated.
The photoelectric conversion unit 6 outputs a voltage corresponding to the amount of the arc light 13 to the display unit 9. The electrochemical integration element of the display 11 is
The color is changed by applying a voltage. Thereafter, even if the ground fault and the short circuit in the container 1 disappear and the application of the voltage is stopped, the electrochemical integrating element maintains the state in which the color has been changed.

Therefore, even after a lapse of time after the occurrence of a ground fault or short circuit, it is possible to know that a ground fault or short circuit accident has occurred in the GIS by visually checking the color of the display 9. And necessary countermeasures can be taken. Further, according to the present embodiment, a ground fault and short circuit display device can be obtained with a simple configuration in which the photoelectric conversion unit 6 and the display 9 are simply connected. In addition, since an external power supply is not required, labor for maintenance and the like can be saved.

In this embodiment, since the photoelectric conversion unit 6 is arranged to face the high-voltage charging unit 2, a voltage may be induced by the electric field of the charging unit 2. A shield 5 is provided to prevent this. As a result, since the surroundings of the photoelectric conversion unit 6 are at the ground potential, a high voltage is not induced. Further, since the shield 5 is formed in a wire mesh shape, it allows light to pass therethrough, and the photoelectric conversion unit 6 causes the arc light 13 to pass therethrough.
Does not prevent detection.

Further, in the present embodiment, the light receiving surface of the photoelectric conversion section 6 is coated with an insulating material 7. When an arc is generated in the insulating gas, a decomposition gas is generated, which may corrode the photoelectric conversion unit 4. The insulating material 7 is provided to prevent this. (Embodiment 2) FIG. 2 shows a circuit configuration of a second embodiment of the present invention.

In this embodiment, an opening 22 is provided in the container 1, which is closed with a light transmitting member 23 such as acrylic or glass, and the photoelectric conversion section 6 is arranged outside the opening. By arranging the photoelectric conversion unit 4 outside the container 1 as in this example, the shield 6 is provided or the light receiving surface of the photoelectric conversion 6 is coated with the insulating material 7 as in the first embodiment. You don't have to.

(Embodiment 3) FIG. 3 shows a circuit configuration of a third embodiment of the present invention. In this example, the photoelectric conversion unit 6
It is formed in a film shape and is attached to the entire inner periphery of the container 1. Further, the surface is covered with a transparent conductive sheet film 24, and the sheet film 24 is connected to the container 1 at the ground potential.

As described above, by making the entire inner periphery of the container 1 the photoelectric conversion section 6, the area for receiving the arc light 13 is increased, and a voltage sufficient to drive the display 9 can be obtained. . In addition, by covering the surface of the photoelectric conversion unit 6 with the sheet film 24 at the ground potential, a high voltage is generated in the photoelectric conversion unit 4 and corrosion by the decomposition gas is performed as in the first embodiment. Can be prevented.

(Embodiment 4) FIG. 4 shows a circuit configuration of a fourth embodiment of the present invention. In this example, means for projecting inspection light on the light receiving surface of the photoelectric conversion unit 6 is provided so that the operation of the photoelectric conversion unit 6 and the display 9 can be confirmed. An optical fiber 25 is provided through the container 1, and one end of the optical fiber 25 is desired on the light receiving surface of the photoelectric conversion unit 6. At the time of inspection of the display device, an inspection light is emitted from a portion where the optical fiber 25 is projected outside the container 1 using an appropriate light source 26. Thus, if a change in color can be confirmed on the display 6, it can be determined that there is no abnormality in the display device.

(Embodiment 5) FIG. 5 shows a circuit configuration of a fifth embodiment of the present invention. When the circuit breaker is housed in the container 1 of the GIS, the arc light generated when the circuit breaker is opened and closed may be erroneously detected as an arc due to a ground fault or a short circuit. The present example prevents this.

The output of the photoelectric conversion unit 6 is input to a one-shot pulse generation circuit 27, and the output of the one-shot pulse generation circuit 27 is input to one input side of an AND circuit 28. The output side of the AND circuit 28 is connected to the display 6.
The other input side of the AND circuit 28 is connected to the inverter 2
9 and connected to the power supply Vcc.
Grounded through 0. The auxiliary contact 30 is a contact that is turned off when the circuit breaker 31 performs the opening / closing operation, that is, when the current is cut off from the closed state and when the circuit breaker 31 is closed from the closed state.

In the circuit of FIG. 5, while the circuit breaker 31 is in the cut-off state or the closed state, the auxiliary contact 30 is on, and the other input side of the AND circuit 28 is grounded through the inverter 29. . Therefore, the AND circuit 28 is in a gate-on state. If the photoelectric conversion unit 6 detects the arc light, a pulse signal is output from the one-shot pulse generation circuit 27. This pulse signal is input to the display 9 through the AND circuit 28, and the display 9 indicates that a ground fault or short circuit has occurred.

On the other hand, when the circuit breaker 31 performs the switching operation, the auxiliary contact 30 is turned off, so that the other input side of the AND circuit 28 is connected to the power supply Vcc through the inverter 29, and the gate of the AND circuit 28 is turned off. It has become.
Therefore, no voltage is applied to the display 9 even if the photoelectric conversion unit 6 detects the arc light due to the switching operation of the circuit breaker 31.

[0021]

According to the present invention, the ground fault / short circuit display device can have a simple structure without the need for an external power supply.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a first exemplary embodiment of the present invention.

FIG. 2 is a diagram illustrating a configuration of a second exemplary embodiment of the present invention.

FIG. 3 is a diagram showing a configuration of a third exemplary embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a fourth embodiment of the present invention.

FIG. 5 is a diagram illustrating a circuit configuration according to a fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Container 2 ... Charging part 3 ... Storage part 4 ... Cover 5 ... Shield 6 ... Photoelectric conversion part 7 ... Insulating material 8 ... Sealing terminal 9 ... Display 10 ... Container 11 ... Glass plate 12 ... Ground fault 13 ... Arc light 22 ... Aperture 23 ... Light transmitting member 24 ... Sheet film 25 ... Optical fiber 26 ... Light source 27 ... One-shot pulse generation circuit 28 ... And circuit 29 ... Inverter 30 ... Auxiliary contact 31 ... Circuit breaker

Claims (6)

[Claims] A container for accommodating a high-voltage charging unit; a photoelectric conversion unit housed inside the container and inducing a voltage when an earth light generated in the container and an arc light due to a short circuit are detected; A display unit including an electrochemical integration element disposed outside and connected to the photoelectric conversion unit, the electrochemical integration element being formed of a material that undergoes an oxidation-reduction reaction by a voltage induced by the photoelectric conversion unit and changes color. A ground fault, short circuit display device comprising: 2. Between the charging unit and the photoelectric conversion unit,
The ground fault or short circuit display device according to claim 1, further comprising an electric shield that allows light to pass therethrough. 3. The ground fault according to claim 1, wherein an opening is provided in a part of the container, the opening is closed by a light transmitting member, and the photoelectric conversion portion is provided outside the container of the light transmitting member. , Short circuit display. 4. The ground fault and short circuit display device according to claim 1, wherein the photoelectric conversion unit is formed in a sheet film shape and fixed inside the container. 5. The ground fault according to any one of claims 1 to 4, wherein a means for generating light with respect to the photoelectric conversion unit is provided to enable inspection of a ground fault or short-circuit display device. Short circuit indicator. 6. A circuit breaker is housed in the container, and a contact that changes the open / close state when the circuit breaker opens and closes causes an output voltage of the photoelectric conversion unit to be displayed on the display unit when the circuit breaker operates. The ground fault / short circuit display device according to claim 1, wherein the voltage is not applied.