JPS5838591Y2 - capacitor soch - Google Patents

Description

[Detailed explanation of the idea] This invention relates to improvements in capacitor devices.

Conventionally, single power capacitors and capacitor discharge coils have been installed on steel frames or insulated frames.

However, since the terminals of the unit capacitor and the terminals of the discharge coil are connected in an external space, a space is required between the terminals and between the containers for insulation purposes, and space is also required for cooling and maintenance. There were drawbacks such as the requirement for

For this purpose, a capacitor device has been proposed in which a capacitor element or a unit capacitor and a discharge coil are housed in one container as shown in FIG.

That is, a plurality of capacitor assemblies 3 each having a plurality of capacitor elements or unit capacitors connected in parallel are arranged inside a container 1, connected in series, and a primary coil of a discharge coil 2 having a secondary coil is connected to the capacitor assembly. The secondary coil of the discharge coil 2 is connected in series so as to generate a voltage difference, and is led out from a terminal 5 provided in the container 1 and connected to a protective relay 6.

This capacitor device has terminals 4, 4 provided in the container 1.
' is connected to the electric circuit.

The capacitor device with this structure is easier to insulate and cool because the container 1 is filled with insulating oil than when it is installed on the above-mentioned steel mount or insulating mount, and the entire device is smaller and has better protection. Satisfied as usual.

However, since the differentially connected connection point of the discharge coil 2 having a secondary coil is not exposed to the outside of the container 1, it is not considered to measure the terminal voltage of the capacitor assembly 3 inside the container 1. In any case, when the secondary coils of the two discharge coils 2 connect the capacitor devices in a Y manner to intercept the three-phase capacitor device group, the terminal 4 of the capacitor device is on the power supply side.

When terminal 4' is set to the neutral point side, the line-to-ground voltage of the power supply is applied to the discharge coil 2 on the terminal 4 side between the primary coil, secondary coil, and iron core, resulting in higher insulation against partial discharge. sexuality is required.

The differential connection of the discharge coil 2 having a secondary coil requires the installation of two transformers each having a secondary coil, which has the disadvantage of being expensive.

This invention attempts to provide a capacitor device that eliminates the above-mentioned drawbacks.

An embodiment of this invention shown in FIGS. 2 and 3 will be described below.

FIG. 2 shows a capacitor device of this invention in which a discharge coil and a transformer without a capacitor and a secondary coil are housed in one capacitor.

That is, a plurality of capacitor assemblies 3 in which a plurality of capacitor elements or unit capacitors are connected in parallel are arranged inside a container 1 and are connected in series, and are wound around both legs of an iron core 80 as shown in FIG. A terminal 11 provided by connecting the intermediate tap of the coil 9 and the iron core 8, and a terminal 1 of the coil 90.
A discharge coil 7 with terminals 0 and 12 is arranged, and a terminal 11 of this discharge coil 7 is connected to a transformer (instrument or protection transformer).
The terminals 10 and 12 are connected to the connection point A of the capacitor assembly 3 through the primary coil 13, and the terminals 10 and 12 are connected to the connection point A of the capacitor assembly 3
It is connected to both terminals and to terminals 4 and 4' provided on the container 1.

The secondary coil of the residual transformer 13 is drawn out from a terminal 5 provided in the container 1 and connected to a protective relay 6.

- The discharge coil 7 is connected to the ground or to the container 1 by means of an insulator.
It is installed in a more insulated manner.

Therefore, for the discharge coil 7, it is only necessary to take into account 1/2 of the maximum working voltage between the terminals 4 and 4' of the capacitor device against partial discharge, and as shown in FIG. It is even more effective if it is placed on the iron core side.

The voltage between the primary coil, secondary coil and iron core of the transformer 13 in FIG. 2 is also about 1/2 of the ground voltage, which is effective against partial discharge.

Furthermore, even when the capacitor is discharging in the primary coil of the transformer 13, the discharging coil 7 manufactured as shown in FIG. Even if the sensitivity of No. 6 is increased, there are fewer malfunctions, and there is no need to consider the thermal effects of discharge energy at all.

Note that since a test voltage approximately twice as high is applied between the terminals of the capacitor device in order to perform a performance guarantee test, it is necessary to design and manufacture the discharge coil 7 in consideration of magnetic saturation.

As mentioned above, this idea connects multiple capacitor assemblies in series, each consisting of a plurality of capacitor elements or unit capacitors connected in parallel, and connects both ends of the series-connected capacitor assemblies to both ends of the discharge coil. It is a capacitor device in which a transformer is placed between the series connection point of the capacitor assembly and the center tap of the discharge coil, and these are housed in one container.It is highly effective against partial discharge and prevents malfunction of the protective relay. It has advantages such as less noise, improved reliability, and low cost because only one transformer is required, and has great practical value.

[Brief explanation of drawings]

Figure 1 is a wiring diagram showing an example of the equipment layout of a modern capacitor device with a built-in discharge coil and secondary coil, and Figure 2 is an example of the equipment layout of a capacitor device with a built-in discharge coil and transformer of this invention. The wiring diagram shown in FIG. 3 is an explanatory diagram of the discharge coil built into the capacitor device of this invention. 1... Container, 3... Capacitor assembly, 4, 4'5... Terminal provided in container 1, 6...
...Protective relay, 7...Discharge coil, 8.
...Iron core of discharge coil I, 9...Iron core 8
10, 12...terminals of coil 9, 11...center tap of coil 9 and iron core 8
Terminal connected to 13...transformer.

Claims (1)

[Scope of utility model registration request] A plurality of capacitor assemblies in which multiple capacitor elements or unit capacitors are connected in parallel are connected in series, both ends of the series-connected capacitor assemblies are connected to both ends of the discharge coil, and the series connection point of the capacitor assemblies is connected in series. A capacitor device in which a transformer is disposed between the capacitor assembly and the intermediate tack of the discharge coil, and the capacitor assembly, discharge coil, and transformer are housed in one container.