JPS5953773B2 - Multiphase bulk gas insulated electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-phase bulk gas-insulated electrical terminator, and its purpose is to reduce the loss and ground surge impedance, and to provide voltage detection electrodes that are not affected by other phases. There is a need to obtain this type of equipment.

FIG. 1 and FIG. 2 are longitudinal cross-sectional views showing a polyphase lump-type gas-insulated electrical equipment of a low-loss and ground-to-ground surge impedance reduction type, which has been considered by the inventor of the present invention. In FIG. 1, reference numeral 1 denotes a multi-phase, for example, three-phase bulk storage container, which is usually made of metal such as iron, is grounded, and has an SF inside. Filled with insulating gas such as gas. Reference numerals 3 to 5 denote three-phase conductors, which are arranged in the container 1 in a substantially triangular shape.

A substantially Y-shaped interphase barrier 6 is provided between the three phase conductors, and this barrier 6 is attached to the container 1 by appropriate means and is kept at the same potential. Focusing on the conductor, it is magnetically disconnected at one or more points so that a magnetic closed loop is not formed between the interphase barrier 6 and the container 1 surrounding the conductor. Further, the length is arbitrarily extended in the axial direction of the container 1 as necessary. The one shown in FIG. 2 has interphase barriers different from those in FIG. 1, and has interphase barriers 61 to 63 each supported by the container 1, but these are insulated from each other approximately at the center of the container 1.

Therefore, when paying attention to each of the phase conductors 3 to 5, the magnetic closed loop is cut off by the barrier and the container. Therefore, with the above configuration, most accidents can be prevented from being ground faults due to the interphase barrier at ground potential, and even if the conductor current increases abnormally due to the above-mentioned accidents, the barrier and container are magnetically No reflux flows from the cut point to the section, and the surge impedance to the ground can be reduced by the barrier, and the degree of this can be freely selected depending on the axial length of the container.

The present invention is constructed by further arranging voltage detection electrodes in a device having such an interphase barrier. In the embodiment shown in FIG. 5, respectively, and are provided with the front air barrier behind them.

These electrodes are each supported by the barrier 6, for example. Lead wires 10 to 12 are connected to the electrodes 7 to 9, respectively, and these lead wires pass through the amplifier 1 together with their shields 13 to 15 to the input side of an amplifier 16 provided outside. It is connected to the. (The figure shows only one phase for simplicity.) With this configuration, each capacitance between the conductor 4 and the electrode 8, and between the lead wire 11 and its shield 14 and the amplifier 16 are well-known. An amplifier type capacitor type voltage transformer is constructed, and a negative terminal 17 such as a relay or meter connected to the output side of the amplifier 16 can accurately recognize the voltage obtained at the electrode 8. . FIG. 4 shows another embodiment of the present invention, which is the same as the one shown in FIG. 2 but equipped with voltage detection electrodes. are placed opposite. In this case read wires 10 to 12 and shields 13 to 15
are individually connected to the input side of an amplifier 16 provided outside by passing through the container 1. In the above structure, the electrode is not affected by other phases because the electrostatic coupling with other phases is almost completely cut off by the presence of the barrier.

For example, regarding the phase of conductor 4, Ca・〈〈C,,C
O・〈〈C, (where C28・: Capacitance between electrode 8 and conductor 3, C,: Capacitance between electrode 8 and conductor 4, Ce・:
capacitance between the electrode 8 and the conductor 5) can be realized,
The electrode 8 receives almost no induction from other phases. Therefore, each of the electrodes accurately detects the voltage of each phase conductor, and if a ground fault occurs in any phase, for example, the phase of conductor 4, and the voltage becomes 0, the voltage of the electrode 8 becomes 0. The signal is transmitted to the amplified capacitor type voltage transformer via the lead wire 11, and the negative voltage 17 correctly detects a ground fault.

Note that the electrodes are not affected by other phases no matter where they are placed within the container partitioned by the barrier.

As described in detail above, according to the present invention, even if the current flowing through the conductor becomes large, the current does not circulate through the interphase barrier or container, so no loss occurs, and furthermore, there is no short circuit between the phases. In addition to reducing the surge impedance to the ground and lowering the peak value of intruding surges, the voltage detection electrode can be prevented from capacitive coupling with other phases by interphase barriers. Since it is cut off, it is hardly affected by other phases, and the conductor of the live part is connected to T.
This has advantages such as eliminating the need for a complicated structure such as branching and configuring a phase separation part outside the container.

[Brief explanation of drawings]

1 and 2 are longitudinal cross-sectional views showing different examples of multi-phase lump-sum gas insulated electrical equipment with low loss and reduced surge impedance to ground, which have been considered in the past, and FIG. FIG. 4 is a vertical cross-sectional view showing one embodiment, and FIG. 4 is a vertical cross-sectional view showing another embodiment. 1...Container, 2...Insulating gas, 3~
5...Multiphase conductor, 6,61-63...
Interphase barrier, 7 to 9 voltage detection electrodes, 10 to 12...
...Lead wire, 13~]5... Sea lead, 1
6......Amplifier, 17......Burden.

Claims (1)

[Claims] 1 In a device that attempts to insulate multiphase conductors by collectively storing them in a container filled with an insulating gas, a grounded interphase barrier is provided between each of the phase conductors, and a conductor of any of the phases is focused on. Also, the interphase barrier, the magnetic loop through the container is 1
The interphase barrier is cut so as to be cut at a plurality of points, and voltage detection electrodes are respectively disposed in a container partitioned by the interphase barrier so as to face each phase conductor. A multiphase gas-insulated electric device characterized in that the voltage obtained at the electrode is led out of the container.