JPH0325183Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a voltage phase detection electrode that improves the accuracy of detecting the voltage level or voltage phase of a power distribution line.

As a conventional voltage phase detection electrode, it has a built-in electrode that is electrostatically coupled to the line under test, and a shielding layer that reduces induction interference of different phase wires to the built-in electrode, and the signal detected by the built-in electrode is Some devices detect the voltage phase of a line under test by inputting it to a measuring device via a lead wire.

However, according to the conventional voltage phase detection electrode,
Even if it has a shielding layer that reduces the induction interference of different-phase wires to the built-in electrode, it cannot completely prevent the capacitive coupling of different-phase wires that go around the shielding layer and detour, so the voltage Phase detection accuracy cannot be sufficiently increased. Therefore, for example, it is necessary to judge loop switching in heavy load areas.
There is a possibility that accurate phase difference detection of 1° or less cannot be performed properly.

This invention was made in view of the above,
In order to accurately detect phase differences with high precision (including voltage level detection when necessary), electrodes are capacitively coupled to the line under test and output a signal according to the line voltage. The present invention provides a voltage phase detection electrode configured such that an inner insulator located on the side of the line to be measured of the member and an outer insulator located on the side of the different phase line of the member have different dielectric constants.

The voltage phase detection electrode according to the present invention will be described in detail below. FIGS. 1A and 1B show an embodiment of the present invention, in which A is a front view and B is a cross-sectional view. As shown in the figure, an electrode according to the present invention (consisting of a pair of symmetrical electrodes, but only one electrode is shown for ease of explanation), collectively designated by the reference numeral 10, is attached to the outside diameter of a covered wire (not shown). The electrode base 1 (outer part 1a
and an inner portion 1c having a higher conductivity than the outer portion 1a), an electrode plate 2 embedded in an electrode base 1 made of an insulator, and a predetermined electrode plate 2 from the electrode plate 2 via a spacer 1b. A flexible layer (or flexible plate) 3 made of a conductor such as copper, aluminum, etc., arranged at intervals and having a surface area sufficiently larger than the surface area of the electrode plate 2, and connected to the electrode plate 2. The core wire 4 , the insulation coating layer 5 on the outside of the core wire 4 , the shield wire 6 connected to the shielding plate 3 on the outside of the insulation coating layer 5 , and the insulation disposed further outside the shield wire 6 It is composed of a cable 8 with a shielded wire and a sheath 7.

The electrode 10 is, for example, an electrode base outer part 1a.
After passing the shielded cable 8 through the shielded wire 6 and soldering the shielded wire 6 to the shield plate 3, the cable 8 and the electrode base outer part 1a are bonded, the spacer 1b is inserted, and the electrode plate 2 and the core wire 4 are connected. This is manufactured by soldering the electrode plate 2 to the spacer 1b, placing the electrode base inner part 1c on top of the spacer 1b, and integrally bonding it to the electrode base outer part 1a. One end of the cable 8 is connected to the electrode plate 2, and the other end of the cable 8 is connected to, for example, a loop switching determination device to be described later.

FIG. 2 shows an application example of the voltage phase detection electrode 10 according to the present invention, which is used as a detection probe 100 of a loop power distribution switching determination device (not shown), and is applied to a covered lead wire (not shown) of a loop switch. The electrode 10 is electrostatically coupled to the wire holder 15 (the adapter 11 and the wire holder 15 are connected by bolts 12 to the adapter 11 which is disposed inside the electrode inner base 1c and can be replaced according to the diameter of the covered lead wire). If the inductivity is different, the electrostatic induction disturbance can be further reduced) and the head 1 respectively connected to the wire holder 15 via a pin.
3, the opening/closing link 14, the cylindrical operating rod 16 fixed to the head 13, and the opening/closing link 1 via the pin.
4, a movable shaft 18 located inside the operating rod 16 fixed to the pushing rod 17, an operating box 19 fixed to the operating rod 16, and an operating box 19 connected to the operating box 19. The end of the probe 100 passes through the operating lever 20, the spring receiver 21 that contacts the operating lever 20 and is fixed to the movable shaft 18, the spring 22 seated on the spring receiver 21, and the inside of the movable shaft 18 that is connected to the electrode 10. A cable 8 with a shielded wire is shown to be connected to a measuring device (not shown).

The electrode according to the present invention can be used as a voltage detector, a phase detector, etc. in addition to the loop switching determination device described above.

In the above configuration, according to the present invention, the electrode plate 2 embedded in the electrode base 1 made of an insulator is formed by the electrostatically resistant layer 3 embedded at a predetermined interval via the insulator spacer 1b. Therefore, even if the electric field around the electrode 2 changes (for example, due to a 50 or 60 cycle distribution voltage of a different wire adjacent to the wire to be measured), it is hardly affected by it.

In addition, in the electrode base 1, by changing the dielectric constants of the insulators of the outer part 1b and the inner part 1c, and further changing the dielectric constants of the adapter 11 and wire holder 15, the voltage induced on the outside of the electrode can be transferred to the inside thereof. It can be made difficult to get around.

Therefore, the detection voltage remains constant. Since it is not affected by the electric field around the electrode, higher detection accuracy can be obtained compared to conventional electrodes that do not have a thin layer.

FIG. 3 shows a voltage phase detection electrode according to the present invention located at a loop point of a distribution line. Loop switch 200
An example is shown in which the detection parts 203 and 204 are electrostatically coupled to the lead wires 201 and 202 of the electrode 6.
A lead wire 20 extends from a loop switch (pillar switch) 200 fixed to a cross arm 61 of No. 0 through bushings 62 and 63 (63 is omitted in the illustration).
A wire holder 15 containing a built-in 1,202 (eg, butyl rubber insulated wire) electrode (not shown) is fixed thereto. The wire holder 15 is connected to the operation box 1
It is provided at the tip of the operating rod 16 having 9,
Lead wires 201 and 202 of the loop switch 200 are opened by operating the operating lever 20 of the operating box 19.
It can be attached and detached. The built-in electrode of the wire holder 15 detects the voltage signal, and the lead wire 206 is connected to the phase shifter 205 through the operation box 19.
The signal is supplied to the phase shifter 205 via the phase shifter 205. The lead wires 201 and 202 of the loop switch 200 are tension-resistant insulators 7
Overhead electric wire 7 stretched by 2,73
It is connected to 4,75.

As explained above, according to the voltage phase detection electrode according to the present invention, an electrostatically conductive layer is buried at a predetermined interval on the outer periphery of the electrode buried in an electrode base made of an insulator, and the buried electrode Since the inner insulator located on the measured wire side and the outer insulator located on the different phase wire side have different dielectric constants, it is possible to suppress electrostatic induction and improve detection accuracy. .

[Brief explanation of the drawing]

FIGS. 1A and 1B are explanatory diagrams showing the voltage phase detection electrode of the present invention, in which A is a front view and B is a cross-sectional view. FIG. 2 is an explanatory diagram showing a specific example of application of the present invention. FIG. 3 is an explanatory diagram showing an example of use in which the present invention is applied to detect a phase difference on both sides of a loop switch. Explanation of symbols, 1... Electrode base, 1a... Outer part of the electrode base, 1b... Spacer, 1c... Inner part of the electrode base, 2... Electrode plate, 3... Shiyahei layer, 4... Core wire , 5... Insulating coating layer, 6... Shield wire, 7... Insulating sheath, 8... Cable with shield wire, 10... Electrode, 11... Adapter,
12...Bolt, 13...Head, 14...Opening/closing link, 15...Wire holder, 16...Operation rod,
17... Push-up bar, 18... Movable shaft, 19...
...Control box, 20...Control lever, 21...
Spring receiver, 22... Spring, 23...
Groove, 100... Probe for loop switching judge.

Claims (1)

[Claims for Utility Model Registration] An electrode member that is electrostatically coupled to the line to be measured and outputs a signal according to the line voltage, and a thin layer that reduces electrostatic induction interference of different phase wires to the electrode member. and an electrode composed of an insulator in which the electrode member and the insulation layer are embedded, an outer insulator located on the different phase line side of the electrode member, and an outer insulator located on the line to be measured side of the electrode member. and an inner insulator having a larger dielectric constant than the outer insulator.