JPH0643947U - Electrolytic insulator with coupling capacitor for power line carrier - Google Patents

Abstract

(57) [Summary] [Purpose] It is used for supporting conductors of high-voltage or special cubicles, and is used for power detection and power transfer of the line. [Structure] A high-voltage side terminal 4 for connecting a conductor of a high-voltage or extra-high-voltage cable is provided on the upper side of the high-voltage or extra-high-voltage support insulator 1, and a detection terminal 5 and a power line carrier terminal 6 are provided on the lower side. Capacitor Ca for voltage detection connected between high-voltage side terminal 4 and terminal 5 for voltage detection, and capacitor C connected in series with this capacitor Ca and connected to power line carrier terminal 6.
b is provided to support a high-voltage or extra-high-voltage cable or conductor, and is also used for detection of a high-voltage or extra-high-voltage line and a coupling capacitor for power line transportation.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a voltage detector having a coupling capacitor function for a power line carrier.

[0002]

[Prior art]

2. Description of the Related Art Conventionally, as shown in FIG. 2, a voltage detecting insulator for high voltage and extra high voltage lines has a suitable number of high voltage magnetic capacitors C ₁ , C ₂ , C _{3 connected} in series between a high voltage side terminal 4 and a voltage detecting terminal 5. And is molded with epoxy resin 3. The reference numeral 7 designates a mounting metal piece provided below the detector insulator 2.

As shown in FIG. 3, the detector insulator 2 configured in this manner is often attached to the cable chamber as a conductor of the high-voltage or extra-high-voltage cabicle 11 or a support insulator of the lead-in cable 16. In this case, the voltage detection terminal 5 is grounded via the voltage display circuit 17 in which the resistor R and the neon tube N are connected in parallel to detect the high voltage or the special high voltage line 15.

On the other hand, in the power line carrier line system, as shown in FIG. 4A, in the substations A and B, the power line carrier device PCL is connected to the high voltage or the special high voltage line 15 via the coupling capacitor C _K , respectively. Connect and communicate.

As the coupling capacitor C _K , a dedicated coupling capacitor is prepared, or as shown in FIG. 4B, the primary of the winding type current transformer CT with a shield screen for detecting the current of the line 15, The stray capacitance between the secondary windings 21 and 22 is used as a coupling capacitor C _K through the shield screen S between the windings 21 and 22.

[0006]

[Problems to be solved by the device]

 As mentioned above, if a power line carrier system is required, use a dedicated coupling capacitor or use a wire wound current transformer with a shield screen.

When the current transformer is a bushing type or a ring core type, it cannot be used as a coupling capacitor, so a dedicated coupling capacitor is used. Providing a dedicated coupling capacitor on the sending feeder or retracting cubicle has more advantages than installing it on a pole because the distance of the cable to the power line carrier PLC is shortened and the installation and maintenance are simple. . However, in recent years, the cubicles themselves have been shrinking, and it has become increasingly difficult to secure space for mounting components.

The present invention has been made in view of the above-mentioned conventional problems, and the purpose thereof is to use the line as a support for a conductor or a lead-in cable of a high-voltage or extra-high-voltage cubicle. Another object of the present invention is to provide a detection insulator with a coupled capacitor for a power line carrier, which can be used for power detection and power line carrier.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, an electric insulator with a coupling capacitor for a power line carrier according to the present invention is a high-voltage or extra-high-voltage support insulator having a high-voltage or extra-high voltage side terminal in the upper part, and an electro-detector terminal in the lower part and A power line carrying terminal is provided, and inside it is provided a detecting capacitor connected between the upper terminal and the detecting terminal, and a capacitor connected directly to the power carrying terminal in series with this capacitor. It will be.

[0010]

[Action]

 Support insulators are used as conductors in high-voltage or extra-high-voltage cubicles or as support insulators for drop-in cables. Also, by connecting the lower voltage detection terminal to the voltage display circuit, it is possible to perform high-voltage or extra-high voltage power detection that is supported and connected to the upper part via the internal voltage detection capacitor.

Since the capacitor connected in series with the internal detection capacitor functions as a power line carrier capacitor together with the capacitor for power detection, the power line carrier terminal at the lower part to which the series capacitor is connected is connected to the power line carrier terminal. By connecting the device, power line carrier communication can be performed without using a separate power line carrier capacitor.

[0012]

【Example】

 An embodiment of the present invention will be described with reference to FIG. It should be noted that the same components as those shown in FIG. 2 of the related art are denoted by the same reference numerals, and duplicate description thereof will be omitted.

In FIG. 1, 3 is a high-voltage side terminal provided at the center of the upper portion of an insulator 2 made of epoxy resin, and 5 and 6 are terminals for electricity detection arranged at appropriate intervals in the lower part of the insulator body 2. Power line carrier terminals, Ca and Cb are high-voltage porcelain capacitors connected in series between terminals 4 and 6, and a is connected to the voltage detection terminal 5 at the connection point between the capacitors Ca and Cb.

The capacitances of the capacitors Ca and Cb are selected so that they have good high-frequency characteristics even with respect to currents of several KHZ or more, and the capacitances are set to appropriate values or more, and the series capacitors (Ca + Cb) are used as power line carrier devices. The capacitor Ca is used as a power line carrier coupling capacitor and the capacitor Ca is used as a voltage detecting capacitor.

Then, this support insulator is attached to the support fitting of the cubicle by screwing the bolt to the mounting fitting 7. The conductor of the high voltage or extra high voltage service cable or the main circuit conductor is fixed to the high voltage side terminal 4 with a terminal bolt and used as a support insulator.

Further, the power detection terminal 5 is connected to the voltage display circuit to perform power detection, and the terminal 6 is connected to the power line carrier to be used as a power line carrier coupling capacitor.

According to this embodiment, since the support insulator can also be used for the one in which a dedicated coupling capacitor is separately provided for power line carrier in the related art, space saving and component saving can be achieved.

[0018]

Since the present invention is configured as described above, it has the following effects.

(1) While being used as a support insulator for a conductor of a high-voltage or extra-high-voltage cubicle, it can be used for detection of the line and power line carrier communication.

(2) Therefore, it is possible to omit the power line carrier coupling capacitor, which has conventionally been required to be separately prepared, and to save parts and space.

(3) Further, since the cubicle can be downsized, the economic merit is large.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a schematic configuration of a detector insulator according to an embodiment.

FIG. 2 is a cross-sectional view showing a schematic configuration of a detector insulator according to a conventional example.

FIG. 3 is an equivalent circuit diagram of a conventional voltage detecting device using a voltage measuring insulator.

FIG. 4A is a conceptual diagram of a power line carrier system. (B)
FIG. 3 is an explanatory view of the configuration of a wire wound current transformer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Support insulator 2 ... Electrostatic insulator 3 ... Epoxy resin 4 ... High voltage side terminal 5 ... Voltage detection terminal 6 ... Power line carrying terminal 7 ... Mounting bracket 11 ... Cubicle 12 ... High voltage circuit portion 13 ... Low voltage circuit portion 15 ... High voltage Or special high-voltage line 16 ... Cable 17 ... Voltage display circuit 21 ... Primary winding 22 ... Secondary winding C, C _{1 to} C ₃ , Ca, Cb, C _K ... Capacitor CT ... Winding current transformer N ... Neon Tube R ... Resistance S ... Shield screen

Claims (1)

[Scope of utility model registration request] 1. A high-voltage or extra-high-voltage support insulator having a high-voltage or extra-high-voltage side terminal on an upper part, and a detection terminal and a power line carrying terminal provided on the lower part, and the upper terminal and the detection terminal on the inside. A capacitor for voltage detection connected between terminals and a capacitor connected to the terminal for power transfer in series with this capacitor were provided so that it could be used as a capacitor for voltage detection of a high voltage or extra high voltage line and a coupling capacitor for power line transfer. An electric insulator with a coupling capacitor for carrying power lines.