JP2002214254A - Arrester type power transmission/distribution line current/voltage measuring apparatus and power transmission/distribution line current/voltage measuring system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an arrester type power transmission/distribution line current and voltage meter which can measure voltage and current of a power transmission/distribution line while allowing simple installation thereof at an arbitrary location with a simple work along with a smaller size and a less cost by accurately accomplishing insulation to the ground without use of a transformer for an instrument and a current transformer for the instrument requiring a costly and larger insulator. SOLUTION: There are arranged a current measuring device 12 which is detachably mounted on a power transmission/distribution line 1 to detect current thereof, an arrester device 14 which performs an arrester function through a resistance element 50 for a high voltage built into an insulator 48 while having a voltage sensor for detecting the voltage of the power transmission/distribution line 1 and an optical signal conversion means (28) for converting the sensed current signal of the power transmission/distribution line 1 to an optical signal while a light transmission path 52 is provided in the insulator 48 of the arrester device 14. Moreover, a photodetecting means (90) is provided and inputs the optical signal to convert the current information of the power transmission/distribution line to an electrical signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides an arrestor function for protecting the insulation of power equipment by discharging to the ground when an abnormal voltage, such as lightning, invades an electric circuit of a transmission and distribution line. The present invention relates to an arrester-type transmission / distribution line current / voltage measurement device that detects a voltage.

[0002]

2. Description of the Related Art In order to stably and rationally supply power, a normal voltage / current of a transmission / distribution line is constantly monitored, and in the event of an accident, a power transformer (PT) or a transformer for operating a relay to open a circuit breaker is provided. Current transformers (CT) are widely used. Instrument transformers and current transformers are, for example, to install a high-voltage transformer in a substation, etc., and to convert and output a voltage value and a current value in proportion to the voltage or current of the primary transmission and distribution line,
While widening the measurement range of current and voltage, or performing insulation between the electric circuit and the meter, convert high voltage to low voltage, and connect the meter or relay while insulated from the high voltage circuit to monitor the transmission and distribution lines. Is being done.

[0003]

By the way, in the instrument transformer, a low-voltage terminal on one side is grounded, so that a withstand voltage insulation is required. In particular, a coil on the high-voltage side is provided separately from a lightning arrester on an electric circuit. High withstand voltage insulation that can withstand surge voltage such as is required. For this reason, it is necessary to provide a large insulation for each coil, and a large and expensive PT built-in insulator must be prepared as compared with other insulators in order to have a structure in which insulating oil is sealed. For example, in the case of a high-voltage transmission line of about 66 kilovolts, an insulator having a diameter of 1.5 m and a height of 6 m or more is used.
The cost was extremely high compared to a station post type insulator installed on a pole of a distribution line having a size of about 2 cm and a height of about 2 m, and the installation required a large-scale construction. Therefore, the installation is limited to only limited places such as substations and main transmission lines, and the monitoring of the transmission and distribution line voltages is also limited, which makes it difficult to provide detailed and efficient power supply. . Similarly, for the current transformer for the instrument, one side of the output terminal is grounded.
It was necessary to install a large and expensive insulator between T and the electric wire, and to attach the CT away from the electric wire. For this reason, the number of turns of the CT transformer must be increased in order to maintain the measurement accuracy, and this has the disadvantage that the magnetic field of the other phase is detected and the relative measurement accuracy is inferior.

In addition, since installation is performed only in a limited place such as a substation or a main transmission line, it takes time to detect a place such as a ground fault accident or a disconnection accident, and the detection is performed by manual patrol or notification. There were problems such as having to find the location.

The present invention has been made in view of the above problems, and an object of the present invention is to reliably perform ground insulation without using an instrument transformer or an instrument current transformer using expensive and large-sized insulators. It can protect equipment such as measuring instruments and protection relays, is small and low-cost, can be easily installed at any location with simple construction, and can measure the voltage and current of transmission and distribution lines with good accuracy. It is an object of the present invention to provide an arrester-type transmission / distribution line current / voltage measuring device capable of enhancing the function of monitoring a distribution line and efficiently detecting a location such as an efficient power supply and an accident.

[0006]

In order to achieve the above object, an arrester-type transmission / distribution line current / voltage measuring apparatus 10 according to the present invention is removably mounted on a transmission / distribution line 1 and has a current of the transmission / distribution line. And a arrester function via a high-voltage resistance element 50, which is disposed in close proximity to the current measuring apparatus and directly receives the voltage of the power transmission and distribution line 1 and is built in the insulator 48, Perform and transmission and distribution line 1
Device 14 having a voltage sensor for detecting the voltage of the arrestor
And an optical signal conversion means (28) for converting the detected current signal of the transmission and distribution line 1 into an optical signal, and the optical signal is converted and transmitted by the optical signal conversion means in the insulator 48 of the arrester device 14. An optical transmission line 52 is provided, and is provided with a light receiving means (90) for inputting an optical signal to be optically transmitted and converting current information of the transmission and distribution line into an electric signal.

The optical transmission line 52 is advantageously a transmission line hole provided through the high-voltage resistance element 50 disposed in the insulator 48.

Further, it is preferable to provide a pressure releasing means for releasing the expansion air pressure generated when the internal high voltage resistance element 50 generates heat when a high voltage is applied to the transmission and distribution line 1.

The pressure releasing means may include a locking member which is fitted to one end of the insulator containing the high-voltage resistance element and which is detached from the insulator by high air pressure inside the insulator.

The locking member may be an elastic airtight cap fitted to one end of an insulator having a built-in high-voltage resistance element. In particular, it is advantageous to adopt a configuration including a lead wire 88 that penetrates the elastic airtight cap and conducts the power transmission and distribution line 1 and the high-voltage resistance element 50.

Further, the transmission / distribution line current / voltage measurement system of the present invention is configured by installing the arrester-type transmission / distribution line current / voltage measuring device at a plurality of arbitrary positions on the transmission / distribution line.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an arrester-type transmission / distribution line current / voltage measuring apparatus according to the present invention. 1 to 5 show one embodiment of an arrester-type transmission / distribution line current / voltage measuring apparatus (hereinafter, referred to as an “arrestor-type measuring apparatus”) of the present invention. The arrester-type measuring device according to the present embodiment is detachably attached to the transmission and distribution line, detects the current of the transmission and distribution line, performs a transformation function via a high-voltage resistance element, and further performs Detects and monitors voltage, and at the same time, when an abnormal voltage such as a lightning surge invades, discharges the high voltage to the ground to protect the insulation of equipment.Multi-function transmission and distribution with voltage measurement, current measurement, and lightning arrester functions. It is a current and voltage measuring device for electric wires. In particular, the arrester-type measuring device according to the present embodiment includes:
A lightning arrester having a high-voltage resistance element itself is provided with a voltage measurement function and a transmission path for a detected current signal, and is further configured as an arrester having a function for an instrument transformer including an instrument transformer and a current transformer. It is characteristic.

In FIG. 1, an arrester-type measuring device 10 according to the present embodiment is a current measuring device 12 detachably mounted on the transmission and distribution line 1, and is disposed in proximity to the current measuring device and installed on a support stand or a telephone pole. An arrester device 14. The arrestor device 14 of the embodiment is vertically mounted on a support stand or an arm (not shown) provided on the ground of a substation, for example, and is stretched in a horizontal direction via a mounting bracket 16 for holding electric wires fixed to an upper end thereof. The clamped electric wire 1 is clamped in a gripping shape and fixed to the electric wire. In the present embodiment, a current measuring device 12 having a current sensor 20 built in a cylindrical case 18 that opens and closes in two parts is fixed to the mounting bracket 16. It is detachably attached to the electric wire 1 via a split opening / closing portion. Thus, in this embodiment,
The arrester device 14 and the current measuring device 12 are integrally formed, and are detachably attached to the transmission and distribution line 1 as a whole.

FIG. 3 is a schematic perspective view of the configuration of the current measuring device. In FIG.
The case 18 includes a current sensor 20, a power supply unit 22, and an optical modulation unit (42) that constitutes a part of an optical signal conversion unit 28 that converts a detection current signal of a transmission and distribution line by the current sensor into an optical signal. It is built in.

In this embodiment, the case 18 includes a cylindrical electric wire holding portion 30A and a continuous rectangular box-shaped circuit housing portion 30B below the electric wire holding portion 30A, which are integrally formed of plastic such as polyethylene. ing. The electric wire holding portion 30A is formed with a through hole 30C through which the transmission and distribution line 1 penetrates along a substantially center line in the longitudinal direction, and is formed to be openable and closable along the through hole 30C in two parts. ing. A detachable part 32 is provided at one end of the opening and closing part. In the figure, a hook body 34 protruding outward from the upper half-split body facing the divided upper and lower parts, and a buckle piece 36 hooking and engaging with the hook of the hook body 34 are provided. The electric wire clamp 30 by the standing and falling operation
A is opened and closed and the closed state is locked. These form the detachable portion 32. The mounting structure and material of the current measuring device 12 to the transmission and distribution line 1 are not limited to this embodiment. For example, a material having a screw hole at the open / close end of the half-split body is protruded at a position opposite to the one when closed, and is made of a synthetic resin or the like material that does not cause electric field fluctuation or voltage fluctuation around the material. It may be detachably fixed with a screw made of. Further, it may be a configuration of a simple male and female fitting recess and protrusion, or may be any other configuration.

In the embodiment, the current detector 24, the voltage detector 38, and the current sensor 20 of the power supply unit 22 are embedded in the electric wire holding portion 30A along the through hole 30C. In the circuit housing section 30B, an optical modulation circuit 42 as the optical signal conversion section 28 is housed.

The current sensor 20 is a current detecting means using a coil for detecting, as an induced voltage, a change in a magnetic field formed around the current sensor 20 by a current flowing through the transmission and distribution line 1. In the present embodiment, for example, FIG. As shown in FIG. 4, the single-layer coils 20A and 20B wound around two annular rings having a rectangular cross section
Are arranged on both sides of the transmission and distribution line 1 so as to face each other.
More specifically, in the present embodiment, each coil 20
A and 20B are formed by winding a conductive wire into a rectangular shape by a predetermined number of times, and the first coil 20A is parallel to the upper part of the electric wire holding portion 30A of the case 18 along the through hole 30C. And the second coil 20 </ b> B is similarly embedded in the wire holding portion 3.
It is buried in the lower part of 0A so as to make the gap as small as possible so that the tip ends are parallel to the through hole 30C. The first coil 20A and the second coil 2
0B is arranged opposite to both sides of the transmission line 1 so that the winding direction is reversed. One end C1 of the first coil 20A and the other end D of the second coil 20B
2 are connected in common to form a series connection, and the first coil 20
The other end C2 of A and one end D1 of the second coil 20B are connected to the light modulation circuit 42 to supply the detection output.

More specifically, as shown in FIG.
For example, the number of turns N [turns] of the second coil 20B, the length L [m] of its lateral side, and the distance u between its tip and the transmission and distribution line 1
[M], the distance m [m] between the lower end thereof and the transmission and distribution line 1, the effective value I of the current i flowing through the transmission and distribution line 1, the magnetic flux density at a distance r from the transmission and distribution line 1 is φ, and the magnetic permeability is μo, current i
Using the frequency f and the angular frequency ω, the induced voltage e of the second coil 20B is derived in principle by a derivation formula (for example, Japanese Patent Application No. 2000-11086, the formula (8) in FIG. 9).

As a result, in the present embodiment, since the two coils 20A and 20B are arranged vertically and connected in series, a detection voltage of 2 × e is obtained in the detection outputs C1 and D2. , And supplied to the light modulation circuit 42.

On the other hand, the power supply section 22 is a power supply circuit for supplying power to the optical modulation circuit 42. In the present embodiment, the power supply section 22 detects the voltage and current of the transmission and distribution line 1 in a non-contact manner and outputs the detected voltage and current. It is a power supply circuit that obtains power by converting it into a power supply. In particular, in the present embodiment, the current detector 24 as current detecting means for detecting the current of the electric wire buried in the electric wire holding portion 30A of the case 18 and using the electric current as a power supply, and detecting the voltage of the electric wire and using this as a power supply It includes a voltage detector 38 as a voltage detecting means to be used, and a constant voltage circuit 26 provided in the circuit storage section 30B.

The current detector 24 is, for example, as shown in FIG.
As shown in FIG. 2, the current sensor 20 is formed of the same coil as the above-described current sensor 20. In the present embodiment, the current sensor 20 is formed of a single-layer coil wound around an annular core having a rectangular cross section. Are arranged along the through hole 30C. The detection outputs E1, E2 of the current detector 24
Are connected to the input of the constant voltage circuit 26. The voltage detector 38 is formed of a non-grounded capacitor in the embodiment. For example, as shown in FIG. 5B, the voltage detector 38 is formed in a semi-concentric cylinder and faces the current detector 24 so as to face the current detector 24.
8 is provided along the through hole 30C below the wire holding portion 30A.

The voltage detector 38 is voltage detecting means for detecting the voltage by dividing the capacity of the transmission and distribution line 1 with respect to the ground and detecting the voltage. As shown in FIG. A non-grounded capacitor formed by two aluminum conductor plates 38A and 38B formed in a semi-concentric cylindrical shape so as to face the current sensor 20 composed of a coil around the coil 1 is advantageously applied. In the present embodiment, the voltage detector 38 is provided below the electric wire holding portion 30A of the case 18 so as to face the current detector 24 along the through hole 30C.
Are laid and buried. That is, a coil of the current detector 24 is buried in the upper part of the transmission and distribution line 1, and the two coils are formed of two aluminum conductor plates so as to surround the lower part of the transmission and distribution line 1 with the center thereof facing the coil. A ground capacitor is embedded. And the voltage detector 3
Eight detection outputs F1 and F2 are connected to the inputs of the constant voltage circuit 26.

The constant voltage generating circuit 26 is a constant voltage power supply circuit that combines the detection outputs from the current detector 24 and the voltage detector 38 to generate a constant voltage. For example, each of the current detector 24 and the voltage detector 38 A plurality of rectifier circuits, such as a diode bridge, for rectifying the detected output, a smoothing capacitor connected in parallel to smooth the rectified output, and a DC-capacitor for stabilizing the output smoothed by the smoothing capacitor. A stabilizing circuit such as a DC converter is included. The output of the stabilizing circuit is supplied to the light modulation circuit 42.

Although not shown in FIG. 3, in FIG. 3, a temperature sensor such as a temperature-sensitive resistance element whose resistance changes according to the detected surface temperature of the transmission and distribution line 1 is installed in the case to measure the current. You may make it monitor so that a function may be performed stably. In this case, for example, a signal processing circuit or the like may be provided, the temperature information thereof may be optically modulated, and transmitted along with a current detection signal via an optical transmission line provided in an arrester device described later.

Further, referring to FIG.
Is an optical modulation unit for inputting a current signal output from the current sensor 20 obtained from an induced voltage due to a magnetic field change around the transmission and distribution line and transmitting the change as an optical signal. Transmission and distribution line 1 from sensor 20
The integrator formed by an operational amplifier or the like that integrates the detection output corresponding to the differential value of the current and amplifies it as a signal proportional to the original current waveform, and the current signal output from the integrator corresponds to the current change And a light intensity modulation circuit for converting the intensity of the light into high and low.

The modulation signal from the above-mentioned light modulation circuit 42 is output to the light emitting element 46 in the arrester device 14 connected via the signal line 44, and emits light with a light emission intensity proportional to a change in current. Here, the light variable signal conversion unit 28 includes a light modulation circuit 42 and a light emitting element 46. Note that the light modulation circuit is not limited to one that converts a change in current into light intensity as in the embodiment, and may be, for example, Vf conversion, conversion to an optical pulse train, or light wavelength conversion.

Returning to FIG. 1, the arrester device 14 is integrally fixed to the current measuring device 12 detachably mounted on the electric wire, and is provided such that the upper end side of the arrester device grips the transmission and distribution line 1. Have been. The arrestor device 14
A high-voltage resistance element 50 is built in the insulator 48 to perform an arrester function and a voltage detection function. In particular, in the present invention, a transmission path 52 for transmitting an optical signal output from the light emitting element 46 is provided inside the insulator 48 so that information on a change in current of a transmission and distribution line can be transmitted with high accuracy and stability. ing.

In the figure, an arrestor device 14 is a vertical long body formed by continuously forming a plurality of grooves and mountains in a pleated shape in the vertical direction on a peripheral side surface, and a through hole in the center portion in a body length direction. A hollow insulator 48 having a hole 54 formed therein;
When a normal voltage is applied and a normal voltage is applied, a very small current is supplied. When an abnormally high voltage such as lightning is applied, the resistance decreases and a large current for a lightning arrester flows. Voltage resistance element 50 and high voltage resistance element 50
And a voltage sensor element 56a connected to the high-voltage resistance element and disposed below. After being discharged by a lightning strike or the like, the high-voltage resistance element 50 cuts off a commercial frequency current flowing to the ground following the discharge current, and maintains a normal power transmission state. The hollow interior of the insulator 48 is protected by a hollow cylindrical silicon wall formed in close contact with its inner wall. In the embodiment, the hollow interior of the insulator 48 is in a state where dry air is present, and is a free space.

In the embodiment, the high-voltage resistance element 50
Is composed of a gapless arrester in which one or a plurality of zinc oxide (ZnO) elements are joined in series and stacked. In this embodiment, two zinc oxide elements are joined and arranged in series in a hollow hole of the silicon wall 49. The insulator 48 is arranged at an upper and lower middle position of the through hole. This high-voltage resistance element 50
The position of the zinc oxide element 50b on the lower side of the conductive metal ring 60 is determined by an insulating positioning member 58.
And 62, a voltage sensor element 56a is sandwiched from above and below. A voltage-dividing lead wire 63 is fixed to the upper conductive metal ring 60 with one end thereof extended to the outside to form a measurement electrode on the upper surface side of the voltage sensor element 56a. In the embodiment, the voltage sensor element 56a
Are connected in series with the high-voltage resistance element to form a voltage-dividing resistor, and are made of the same zinc oxide as the high-voltage resistance element 50. For this reason, errors due to temperature changes are less likely to occur. The high-voltage resistance element 50 has such a large resistance that only a weak current flows when the transmission and distribution line is in a normal state.
And the voltage on the transmission / distribution line side is detected from the voltage ratio determined by the resistance value with the voltage sensor element 56a. That is,
By setting various resistance values of the elements of the voltage sensor 56 composed of the high-voltage resistance element 50 and the voltage sensor element 56a, a desired transformation ratio corresponding to the voltage drop can be obtained and a kind of transformation function can be performed. At the same time, by measuring the voltage on both the upper and lower sides of the voltage sensor element 56 as a voltage dividing resistor, it functions as a voltage sensor on the transmission and distribution line side.

On the other hand, a hollow cylindrical lower receiving member 64 having a bottom is fitted so as to cover an opening at the lower end of the main body of the insulator 48, and is fixed by cement 73 or the like. Further, a ring receiving groove is formed in the inner wall of the insulator 48 at a position near the lower end, and a metal snap ring 66 is fitted in the ring receiving groove. On the upper surface side of the metal snap ring 66, a thick plate-shaped upper and lower two-piece caulking metal fitting 68 forming a V-groove on the peripheral surface is mounted, and an elastic O-ring 70 is mounted in the V-groove. The O-ring 70 is pressed against the inner wall surface of the insulator 48 by applying force to the two-piece caulking metal fitting 68 from above and below so as to be watertight or airtight. Further, on the upper surface of the upper caulking metal fitting of the two-piece caulking metal fitting 68, a conductive metal supporting member 72 having a flat supporting surface is disposed on the upper surface of the upper caulking metal fitting so as to hang down its legs. ing. The lower conductive metal ring 62 of the above-described conductive metal rings is mounted on and supported by the support surface of the metal support member 72, whereby the high-voltage resistance element 50 applies a biasing force downward. When the metal snap ring 66 is received, the metal snap ring 66 receives this, and the two-piece caulking metal fitting 68, the conductive metal support member 72,
The lower conductive metal ring 62, the voltage sensor element 56a, and the upper conductive metal ring 60 are supported. A ground terminal is provided on the metal snap ring 66, and a ground wire 74 is connected to the ground terminal and extends to the outside. Then, the above-described voltage dividing lead wire 63 and the ground wire 74
For example, by measuring the voltage between the upper and lower surfaces of the voltage sensor element 56a with a voltmeter on the ground side at the extension end of
The voltage of the transmission and distribution line is measured from the voltage ratio with the voltage across the high-voltage resistance element.

On the other hand, inside the hollow hole of the insulator 48 and above the high-voltage resistance element 50, a vertical hollow metal ring 76 is vertically arranged.
And the spring 80 constantly urges it downward. Further, an upper hollow metal vertical ring 82 having a hollow portion disposed concentrically above the hollow metal vertical ring 76 and an upper end located near the upper end of the insulator is mounted in series. The upper end of the insulator 48 is screwed with an upper closing fitting 83 having an elastic closing cap 96 fitted at the center thereof, and the inside is closed.

As shown in FIG. 2, a mounting bracket 16 including a clamp portion 100 is fixed to the upper surface of the upper closing bracket 83, and the arrester device 14 and the electric wire are fixed via the mounting bracket 16. Further, the arrester device and the current measuring device 12 are connected. In the drawing, a mounting bracket 16 has a hollow square frame shape in a plan view and a lower surface welded and fixed to an upper surface of an upper closing metal bracket 83, and a mounting frame portion 102, which is integrally fixed to one end side of the mounting frame portion 102 and has an upper side L. A first clamp piece 104 provided to be raised in a letter shape, a driving screw member 106 arranged laterally in a hollow square frame of the underframe 102, and a lower portion screwed into the driving screw member 106. A second clamp piece that moves forward and backward with respect to the first clamp piece according to the rotation of the screw member. Needle electrodes 86 are fixed to the opposing surfaces of the first and second clamp pieces, respectively, with their tips facing in opposite directions. The first and second clamp pieces are moved closer to each other to narrow the electric wire 1 between them. When the two clamp pieces are forcibly moved in the opposite direction, the covering portion of the electric wire 1 is punctured, and the tip of the sheath contacts the core wire of the wire 1 and the tip is connected to the core wire of the wire 1 for electrical conduction. are doing. One end of the lead wire 88 is connected to the mounting bracket 16, so that the voltage of the electric wire is directly applied to the high voltage resistance element side. As shown in the figure, a mounting bracket 110 is fixed to one end of the first clamp piece 104 so as to protrude therefrom.
2 is fastened and fixed to the mounting bracket 110 by bolts or the like. As a result, the entire arrester-type current / voltage measuring device 10 is integrally fixed so as to grip the electric wire. The other end of the lead wire 88 passes through the center of the elastic closing cap 96 of the upper closing fitting 83 and is connected to the upper hollow metal vertical ring 82. Thus, the voltage of the transmission and distribution line is directly applied to the high-voltage resistance element 50 via the lead wire 88, the upper hollow metal vertical ring 82, and the hollow metal vertical ring 76 to apply a voltage.

As described above, one characteristic of the present invention is that an optical signal conversion means for converting a detection current signal of a transmission and distribution line into an optical signal, and an optical transmission line provided in an insulator of an arrester device. 5 is provided with a light receiving means for inputting an optical signal to be transmitted optically and converting current information of the transmission and distribution line into an electric signal. In FIG. A high-luminance LED (Light Emitting diode) is provided as the light emitting element 46 fixed to the metal fitting 83, and constitutes the optical signal conversion unit 28 as an optical signal conversion unit together with the optical modulation circuit 42 provided in the current measuring device 12. ing. The light emitting element 46 receives a modulation signal from the light modulation circuit 42 and generates an optical signal related to current information corresponding to the modulation method. For example, a laser diode or the like may be used.

On the other hand, as shown in FIG. 5, a through hole 50c is vertically formed at the center of the high-voltage resistance element 50, and upper and lower conductive metal rings 60 and 62, a conductive metal support member 72 are provided. A hollow through hole is formed in each of the two-piece caulking fitting 68 and the metal snap ring 66. Moreover, these holes are formed with a certain size of diameter at the concentric position with the hollow through-holes of the hollow metal vertical ring 76 and the upper hollow metal vertical ring 82, and the whole vertically extends substantially the center of the insulator. It is formed as a straight through hole penetrating straight. In the present embodiment, this constitutes the optical transmission line 52. The interior of the straight through hole is a cavity through which dry air enters, and the cavity of the straight through hole is a propagation medium of the optical transmission path. That is, in the embodiment, the light transmission path 52 is provided inside the insulator to form the light emitting element 46.
, And is formed as a cavity of a straight through hole formed so as to connect the light receiving elements 90 linearly. The straight through hole may be filled with a known insulating oil and used as a transmission medium. A light receiving element 90 as a light receiving means is located at the center of the lower receiving bracket 64 at the lower end of the insulator 48 and at the lower end of the straight through hole, that is, at the end side of the optical transmission path 52.
Is buried. In the present embodiment, the light receiving element 90
Consists of, for example, a phototransistor, receives an optical signal from a light emitting element, converts it into an electric signal, amplifies it, and outputs current information. A current output line 92 is connected to the light receiving element 90 with one end thereof extended to the outside. On the extension side, a signal is output using an information processing device such as a computer on which a predetermined analysis program including waveform analysis is installed. The processing and the like may be performed to measure and analyze the current of the transmission and distribution line. Thus, the current of the transmission and distribution line can be measured via the inside of the insulator 48. Therefore, in addition to the function as the original lightning arrester, it has a voltage measuring function and a current measuring function, and has a function as a conventional instrument transformer or instrument current transformer completely. In particular, while having a voltage and current measurement function, by incorporating a high-voltage resistance element to control high insulation and discharge at the time of abnormal voltage, compared to conventional instrument transformers and current transformer insulators A significantly smaller and lower cost device can be constructed. In the embodiment, the light source light emitting element 46 of the light transmitted through the optical transmission line 52 is constituted by a light emitting diode. However, the light emitting element may be a laser diode and the laser light may be incident on the light receiving element. Good.

In this embodiment, when a high voltage is applied to the transmission and distribution line 1, the internal high-voltage resistance element 50
Pressure release means for releasing the expansion air pressure generated by the heat generation of the pressure sensor. In this embodiment, a certain thickness for positioning of the upper hollow metal vertical ring 82 that fits the center hole of the upper hollow metal vertical ring 82 installed on the upper end side of the insulator 48 to hermetically close the upper and lower gaps. Disc-shaped elastic hermetic cap 94 having a rubber (rubber cap in the embodiment)
Is further provided, and an elastic closing cap 96 is provided which is fitted over the upper surface of the upper closing member 83 so as to close the center opening of the upper closing member 83, and a needle is inserted through the center of the elastic closing cap. A voltage measuring lead wire 88 connected to the electrode 86 is connected. The elastic sealing cap 94 is a locking member that is easily detached from the insulator due to the high air pressure inside the insulator, and may be a heat-resistant resin or metal other than rubber, but keeps the airtight inside the insulator while positioning the lead wire 88. This is preferable in that it can be performed. The lead wire is electrically connected to the power transmission and distribution line 1 via a needle electrode, and is connected to the high-voltage resistance element 50 via hollow or upper hollow metal vertical rings 76 and 82. In this case, for example, when a lightning surge invades, a large voltage is applied to the high-voltage resistance element 50, and at this time, the high-voltage resistance element 5
Even if the surrounding air expands due to heat generation of 0, at least the elastic caps 94 and 96 will be released at an early stage by this air pressure, and the pressure will be released. Can be physically blocked to prevent damage to the arrester device and damage to peripheral devices.
In the embodiment, the pressure release means is a high-voltage resistance element 50.
And a lead wire 88 penetrating the airtight cap and electrically connecting the transmission / distribution line 1 and the high-voltage resistance element 50 to each other.
And A conductive shield (not shown) is disposed between the inner wall of the insulator and the high-voltage resistance element in a cylindrical shape over the entire circumference of the high-voltage resistance element. The inner wall and the high-voltage resistance element are electrostatically shielded. As a result, the surface side of the insulator and the internal high-voltage resistance element side are electrostatically separated from each other, and the detection accuracy of the voltage sensor does not fluctuate due to climatic conditions, and the detection accuracy is kept good.

The above-mentioned arrester-type transmission / distribution line current / voltage measuring device can be installed at a plurality of arbitrary positions on the transmission / distribution line because the whole can be configured to be small and lightweight and the installation work is easy. In other words, not only the main transmission line but also many general transmission lines and distribution lines can be installed to set many data collection points of the transmission and distribution lines. Then, the current and voltage data from the arrester type transmission / distribution line current / voltage measuring device are input to a computer in a monitoring center or a base station installed on, for example, the ground, which is connected by a required transmission line. By analyzing current and voltage information, it is possible to monitor and manage information on wide-area electric wires. Therefore,
Instead of arranging the substations at intervals of several tens of kilometers, support insulators are installed at intervals of several kilometers, and the arrester-type transmission / distribution line current / voltage measuring device of the present invention is installed in the support insulators. By configuring the system, the current and voltage information of the transmission and distribution lines with a resolution of several kilometers can be obtained.
A fine power supply service can be realized. In particular, this has made it possible to instantly identify those accident points that had previously relied on manual patrol to detect the location of ground faults and disconnection accidents in mountainous areas, etc. Become. In addition to electric power companies, transmission / distribution line current / voltage measurement systems incorporating the arrester-type transmission / distribution line current / voltage measurement device of the present invention are also used for small-scale power systems such as general companies and factories having power generation facilities and transmission / distribution lines. Can be applied, a network based on abundant transmission line information can be constructed, and efficient power system operation and energy saving can be achieved. In addition, this transmission and distribution line current / voltage measurement system combines the information network used for it with the wireless network of mobile phones and satellite communications, and uses similar capital investment in areas and foreign countries where wired facilities are not provided. Service can be provided. In the figure, reference numeral 98 denotes an arm attached to a support base that supports the arrester device.

Next, the operation of the arrester type transmission / distribution line current / voltage measuring apparatus 10 of this embodiment will be described.
The arrestor device 14 is installed at a portion corresponding to a desired measurement position of the transmission and distribution line, for example, by fixing the lower end side to a support base installed on the ground. At this time, the upper end side of the arrester device is fixed to the wire stretched laterally by the wire holding fitting 16. In this case, when the clamp piece is tightened by the driving screw member 106, the needle electrode 86 penetrates through the coating of the electric wire, hits the inner core wire, and is electrically conducted.
The electric wire voltage is directly applied to the high-voltage resistance element 50 via the lead wire 88 connected thereto.

Next, the current measuring device 1 attached to the mounting bracket 16 fixed at the upper end of the arrester device
Attach the 2 split open / close body to the electric wire. At this time, the transmission / distribution line is kept in a live state, and the electric wire holding portion 30A of the case 18 is held.
Is once opened, the transmission and distribution line is made to pass along the through-hole 30C, and then the lower part of the electric wire holding portion 30A is pushed up to close the open / close end, and through the attaching / detaching operation portion such as the hook body 34 and the buckle piece 36. Then, the electric wire holding portion 30A is closed and fixed, and the case 18 is attached to the power transmission and distribution line.

When the current measuring device 12 is mounted on the power transmission and distribution line 1, the detection output detected by the current sensor 20 or the temperature sensor as necessary and corrected by the correction circuit is supplied to the optical modulation circuit 42. At this time, in a state where there is a voltage and a current in the transmission and distribution line 1, the voltage and current of the transmission and distribution line 1 are detected by the voltage detector 38 and the current detector 24 of the power supply unit 22, respectively, and the detected output is a constant voltage. To the conversion circuit 26 sequentially. Thereby, the constant voltage conversion circuit 26
Then, the detected outputs from the voltage detector 38 and the current detector 24 are combined and the stabilized power is supplied to the optical modulation circuit 42.

Next, in the light modulation circuit 42 comprising an LED modulation circuit or the like which has been supplied with power, the detection result from the current sensor 20 is processed and modulated via the signal line 44 by, for example, a light intensity modulation method. The signal is supplied to the light emitting element 46 arranged in the arrester device. As a result, a signal including current information of the transmission and distribution line is converted into an optical signal and output from a light emitting element such as a high-brightness LED. It is transmitted via the path 52. This optical signal is received by a light receiving element 90 such as a phototransistor, and is converted into an electric signal by the current output line 9.
The signal is transmitted to the outside via the second line 2 and subjected to signal processing and the like, and the current of the transmission and distribution line is measured.

On the other hand, in a normal state, the electric wire voltage is cut off by the high-voltage resistance element 50, and only a slight weak current flows. Therefore, the arrester device side is shut off with respect to the voltage of the transmission and distribution line, thereby protecting the insulation. On the other hand, when a lightning surge occurs, a large voltage is applied to the high-voltage resistance element 50, and the voltage is discharged from the ground wire 74 to the ground. Further, by measuring the voltage between the voltage dividing lead wire 63 and the ground and measuring the voltage on the upper and lower surfaces of the voltage sensor element 56a connected in series with the high voltage resistance element, the high voltage resistance element 50; The voltage of the transmission and distribution line is measured from the voltage ratio determined by the value of the resistance with the voltage sensor element 56a. In addition, by setting various resistance values of the elements of the voltage sensor 56 including the high-voltage resistance element 50 and the voltage sensor element 56a, a desired transformation ratio corresponding to the voltage drop can be obtained.

On the other hand, when an abnormality occurs in the transmission and distribution line,
When either the voltage or the current is stopped, for example, when a ground fault or the like occurs and the voltage becomes zero, the power supply unit 22 detects the voltage from the transmission and distribution line to be zero and detects the voltage. The detection output from the body 38 to the constant voltage circuit 26 is stopped.

However, since a current is flowing in the transmission and distribution line, the current detector 24 of the power supply unit 22 detects the current and supplies it to the constant voltage circuit 26. This stabilizes the detection output from the current detector 24 in the constant voltage circuit 26 and supplies power to the light modulation circuit. The light modulation circuit 42 that has received the power supplies modulates the detection output from the current sensor 20 and sequentially supplies the light output to the light emitting element 46. The light emitting element 46 transmits an optical signal containing current information in the optical transmission line 52. ,
Output to the light receiving element 90.

A signal including current information transmitted from the light receiving element 90 via the current output line is, for example, a signal processing signal on the ground side.
Analyzed via an analysis computer. On the other hand, since the voltage waveform obtained from the voltage sensor 56 measures zero, the analyzing computer determines that an abnormality has occurred in, for example, a management center and performs an accident recovery process.

When only the current in the transmission and distribution line becomes zero, the current sensor 20 detects that the current has become zero in the current measuring device 12 attached to the transmission and distribution line. When a normal voltage or an excessive voltage is detected by the voltage sensor 56, each detected output is supplied to an analysis computer or the like. In this case, the power supply unit 22
The current in the transmission and distribution line becomes zero, and the detection output from the current detector 24 to the constant voltage circuit 26 stops. However, since a voltage is applied to the transmission and distribution line, the voltage detector 38 of the power supply unit 22 detects the voltage and supplies the voltage to the constant voltage circuit 26. This stabilizes the detection output from the voltage detector 38 in the constant voltage circuit 26 and supplies power to the light modulation circuit.

As a result, the optical modulation circuit 4 receiving the power supply
2 outputs the detection output from the current sensor 20 to the light emitting element 46 and transmits the data of this signal to the transmission line 52 and the light receiving element 90.
On the other hand, the voltage sensor 56 detects the voltage during normal voltage and measures the voltage with the analyzer, and when the voltage is abnormally high, the electrical resistance of the high-voltage resistance element rapidly decreases. Discharges to ground. Thus, when the measurement result is analyzed to detect that the current waveform is zero, it is determined that an abnormality has occurred in the transmission and distribution line.

When an abnormal voltage is applied to the high-voltage resistance element due to a lightning surge or the like and heat is generated and the surrounding air expands, the elastic pressure-tight cap is blown off by the air pressure, and the voltage lead wire 88 is used. The arrestor device is prevented from being burned or broken at least by separating the arrestor device.

As described above, according to the arrester type transmission / distribution line current / voltage measuring apparatus of the present embodiment, the high-voltage resistance element and the voltage sensor element of the arrester apparatus are connected in series and determined by the respective resistance values. The voltage of the transmission / distribution line is directly applied to the high-voltage resistance element to generate a weak current due to the high resistance. By measuring the voltage across the sensor element, the voltage of the transmission and distribution line can be measured from the voltage ratio. Furthermore, by using a current measuring device that can be attached to and detached from the transmission and distribution lines, current information can be transmitted as an optical signal through the optical transmission means through the insulator, and precise current information can be detected. Therefore, it can be manufactured at low cost by using a small general-purpose insulator such as a station post type, and it is possible to achieve a significant reduction in equipment costs by eliminating the need for a conventional instrument voltage transformer or current transformer. Becomes

The embodiment of the arrester-type transmission / distribution line current / voltage measuring apparatus according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, but is described in the claims. Any modifications without departing from the essence of the invention are included in the present invention. For example, in the above embodiment, a non-grounded capacitor in which two conductor plates are formed in a concentric cylindrical shape is applied as the voltage detector 38, but in the present invention, the non-grounded capacitor has a parallel plate shape or an arbitrary configuration for storing electric charges. May be used in combination with a dielectric material.

In the above embodiment, the current sensor 20
Although two coils disposed opposite to each other on both sides of the transmission and distribution line are applied, one or more coils may be disposed in the present invention. Further, in the above-described embodiment, the case where the case 18 formed by the cylindrical electric wire holding portion 30A and the rectangular box-shaped circuit housing portion 30B is applied has been described as an example. May be any shape as long as the sensors and circuits are effectively arranged and stored, and are detachably formed on the transmission and distribution line. Also,
The arrester device and the current measuring device may be applied separately to the electric wires without connecting them to each other, and connected to a light emitting element with a signal line for supplying an optical modulation signal.

[0051]

As described above, according to the arrester type transmission / distribution line current / voltage measuring apparatus of the present invention, the current measurement including the current sensor which is detachably mounted on the transmission / distribution line and detects the current of the transmission / distribution line. The device and the current measurement device
An arrester device having a voltage sensor that directly receives the voltage of the transmission and distribution line and performs an arrester function via a high-voltage resistance element built into the insulator and detects the voltage of the transmission and distribution line; An optical signal conversion means for converting the detected current signal into an optical signal is provided, and an optical transmission line is provided in the insulator of the arrester device for optical transmission by being converted by the optical signal conversion means. And a light receiving means for converting the current information of the transmission and distribution line into an electric signal, so that the high voltage resistance element of the arrester device cooperates with the voltage sensor element to detect abnormalities such as lightning surges. It functions stably as a high-voltage lightning arrester and voltage sensor, and can be attached to and detached from power transmission and distribution lines using current measurement equipment, optical signal conversion means, and light reception via an optical transmission line provided in an insulator. Since the current of the transmission and distribution lines can be measured by the steps, the insulator for insulation protection can be reduced in size, and these can be replaced with a conventional instrument transformer or current transformer, eliminating the need for them, and at low cost. Manufacturing can be performed, and reduction in equipment cost can be realized.

Also, the optical transmission line is a transmission line hole provided through a high voltage resistance element disposed in the insulator, so that the transmission line voltage can be cut off. By forming a transmission path in the resistance element itself, it is possible to reliably measure the current of transmission and distribution lines without being affected by disturbances or electromagnetic noise, and achieve space savings, resulting in a smaller insulator as a whole. And cost reduction can be realized.

Further, by providing a pressure releasing means for releasing the expansion air pressure generated by the internal high voltage resistance element generating heat when a high voltage is applied to the transmission / distribution line, lightning surge Thus, it is possible to prevent the entire expensive arrester device from being destroyed, and to prevent damage to the equipment.

Further, the pressure releasing means includes a locking member which is fitted to one end side of the insulator having a built-in high-voltage resistance element and is detached from the insulator by a high air pressure inside the insulator, so that the inside of the insulator is provided. It can be easily detached by the inflated air pressure to ensure the protection of the device.

Further, the locking member is an elastic hermetic cap fitted to one end of an insulator having a built-in high-voltage resistance element, and in particular, penetrates the elastic hermetic cap. Therefore, a lead wire for conducting the transmission / distribution line and the high-voltage resistance element can be arranged, so that separation by pressure release, airtight maintenance inside the insulator, and positioning of the lead wire can be performed simultaneously. Further, it can be formed with an extremely simple configuration and inexpensive materials, contributing to low cost.

Further, the arrester-type transmission / distribution line current / voltage measuring device is installed at a plurality of arbitrary positions on the transmission / distribution line, and further, the voltage and current data measured by the arrester-type transmission / distribution line current / voltage measuring device are measured. Is equipped with an analysis computer that receives and analyzes data over a transmission line, and takes in data to a monitoring center installed on the ground or a computer in a base station and transmits information on wide-area transmission and distribution lines via a communication network. Can be monitored and managed.

[Brief description of the drawings]

FIG. 1 is an enlarged configuration explanatory view showing a vertical section of an arrester device of an arrester type transmission / distribution line current / voltage measuring device according to an embodiment of the present invention.

FIG. 2 is an enlarged explanatory view of a main part of the arrester type transmission / distribution line current / voltage measuring apparatus according to the embodiment of FIG.

FIG. 3 is an explanatory perspective view of a main part of the current measuring device according to the embodiment of FIG. 1;

FIG. 4A is a principle diagram of an example of a current sensor applied to the current measuring device according to the embodiment of FIG. 1; (B)
FIG. 3 is a sectional view of a main part of the line XX in FIG. 2.

5A and 5B are diagrams showing a main part of a power supply unit applied to the current measuring device according to the embodiment of FIG. 1, wherein FIG.
FIG. 3B is a sectional view of a main part taken along line YY of FIG. 2.

FIG. 6 is a circuit block diagram of an arrester-type transmission / distribution line current / voltage measuring apparatus according to the embodiment of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Arrester type transmission / distribution line current / voltage measuring device 12 Current measuring device 14 Arrester device 20 Current sensor 22 Power supply unit 24 Current detector 28 Optical signal conversion unit 42 Optical modulation circuit 46 Light emitting element 48 Insulator 50 High voltage resistance element 52 Transmission line 54 Through-hole 56 Voltage sensor 56a Voltage sensor element 86 Needle electrode 88 Lead wire 90 Light receiving element 94 Cap for elastic sealing

Continued on the front page. (72) Inventor, Tominori Matsuda 2-1-1-10, Oe, Kumamoto-shi, Kumamoto (72) Inventor, Eiji Nishiyama 402-8, Yoshitomi, Sashimi-cho, Kikuchi-gun, Kumamoto (72) Inventor, Kenshi Kuwanami, Kumamoto (72) Inventor Hideyuki Kuribayashi 4-19-18 Shimizu, Minami-ku, Fukuoka City, Fukuoka Prefecture Inside of Kuki Co., Ltd. No.Koyo Denki Kogyo Co., Ltd. AG13 AG14 5G013 AA01 AA04 BA02 CB05 DA12

Claims (6)

[Claims] 1. A current measuring device including a current sensor detachably mounted on a transmission / distribution line and detecting a current of the transmission / distribution line, and a current measuring device disposed in proximity to the current measuring device to directly receive a voltage of the transmission / distribution line. An arrester device that performs an arrester function via a high-voltage resistance element built into the insulator and has a voltage sensor that detects a voltage of a transmission / distribution line; and an optical device that converts a detection current signal of the transmission / distribution line into an optical signal. In addition to having a signal conversion means, an optical transmission path for transmitting light after being converted by the optical signal conversion means is provided in the insulator of the arrester device. An arrester-type transmission / distribution line current / voltage measuring device comprising a light receiving means for converting a signal. 2. The arrester-type transmission / distribution line current / voltage measuring apparatus according to claim 1, wherein the optical transmission path is a transmission path hole provided through a high-voltage resistance element disposed in the insulator. 3. The arrester according to claim 1, further comprising a pressure-release means for releasing the expansion air pressure generated by the internal high-voltage resistance element generating heat when a high voltage is applied to the transmission / distribution line. Type transmission and distribution line current and voltage measurement device. 4. The arrester-type delivery system according to claim 3, wherein the pressure releasing means includes a locking member fitted to one end of the insulator containing the high-voltage resistance element and detached from the insulator by high air pressure inside the insulator. Wire current and voltage measurement device. 5. The arrester-type transmission / distribution line current / voltage measuring apparatus according to claim 4, wherein the locking member is an elastic airtight cap fitted to one end of an insulator having a built-in high-voltage resistance element. 6. The arrester-type transmission / distribution line current / voltage measuring apparatus according to claim 1, wherein the arrester-type transmission / distribution line current / voltage measuring device is installed at a plurality of arbitrary positions on the transmission / distribution line. A transmission / distribution line current / voltage measurement system, comprising: an analysis computer that receives and analyzes voltage and current data measured by a voltage measurement device via a transmission line.