JPS5939806Y2 - Harmonic filter device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a harmonic filter device comprising a plurality of unit harmonic filters having resonance harmonics of different orders.

Conventionally, a harmonic filter device consisting of a plurality of unit harmonic filters having resonance harmonics of different orders has been used.
For example, a circuit configuration shown in FIG. 1 is known.

In FIG. 1, 11a. 11b, 11c, 21a, 2
1b, 21c, 31a.

31b and 31c are unit capacitor groups in which a plurality of unit capacitors are connected in series and parallel to obtain a desired capacitance.

Reference numerals 12, 22, and 23 designate resonant axles having one end connected in series and the other end commonly connected for each phase of the capacitor group.

And each three unit capacitor groups 11a-11C92
1a-21c, 31a-31e and the resonant axles 12, 22, 32 connected in series to each phase constitute a set of unit harmonic filters, and each unit harmonic filter 1,
2.3 have resonance harmonics of different orders.

Next, FIGS. 2a and 2b are a plan view and a front view showing an example of the arrangement of the harmonic filter device.

That is, each unit capacitor group 11a, 11b.

11e, 21a, 21b, 21c, 31a, 31b.

31c are arranged in parallel on separate pedestals 4, and predetermined electrical connections are made, and these pedestals 4 are installed on the ground via an inter-ground insulator 5.

Moreover, FIGS. 3a and 3b are a plan view and a front view showing another example of the arrangement of the harmonic filter device.

In other words, the frames 4 shown in FIG.
is used to provide insulation.

However, since the device shown in FIG. 2 has a planar arrangement, it requires a very large installation area and is subject to significant restrictions.

On the other hand, in the case of the one shown in Figure 3, the installation area can be greatly reduced because the mounts for each unit capacitor group are stacked in three stages for each harmonic for three phases. I can do it.

However, the mechanical strength of the unit harmonic filters 1, 2, and 3 needs to be greatly strengthened, and especially when installed in earthquake-prone areas, equipment costs such as frames and insulating supports are significant. The problem is that it is difficult and expensive.

This invention was developed to solve the above problems, and its purpose is to significantly reduce the installation area while maintaining the original filter function, and to easily provide sufficient mechanical strength. It is an object of the present invention to provide a harmonic filter device that is advantageous and can reduce costs.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

4a and 4b are a plan view and a front view showing an example of the arrangement of the harmonic filter device according to the present invention, and FIG.
Components that are the same as those in FIGS.

That is, FIGS. 4a and 4b show unit capacitor groups 11a to 11C121a in a plurality of unit harmonic filters 1, 2.3 having resonance harmonics of different orders and configuring independent circuits as shown in FIG. ~21C931a~31c
are assembled independently for each phase on one stand 4, and those of the same phase among these unit capacitor groups 11a, 2
1a, 31a and 11b.

21b, 31b and 11c, 21c, 31c are stacked in three stages via a harmonic insulator I for each phase.

Furthermore, an inter-ground insulator 5 is interposed between the lowermost pedestal 4 and the ground.

In the harmonic filter device having such an arrangement, since unit capacitor groups of the same phase are stacked on each pedestal 4, the installation area can be significantly reduced.

In addition, as shown in Fig. 3, when the stand 4 of the unit capacitor group is stacked for each harmonic, the interphase insulator 6 is connected to the line voltage of the system voltage, that is, the composite value of the fundamental voltage and the harmonic voltage. It has to be durable.

By the way, in the case of a 33 KV system, for example, the harmonic voltage is usually 6 KV or less, although it varies depending on the rating of the harmonic filter and system conditions.

Therefore, the interphase insulator 6 shown in FIG. 3 is required to withstand the combined voltage of the fundamental wave voltage of 33 kV and harmonic voltage of 6 kV.

In this respect, in the harmonic insulator 7 according to the present invention, the line voltages are in phase and have the same potential, so that only the harmonic voltage of 6 KV is applied.

However, since this type of insulator generally uses insulators, it is necessary to use a large number of insulators in parallel in order to obtain sufficient mechanical strength.

In addition, if the insulator has a high dielectric strength voltage, that is, an insulator with a long shaft dimension, the strength will drop significantly, but if an insulator with a short shaft dimension and low dielectric strength voltage can be used, sufficient mechanical strength can be easily obtained. The cost can also be reduced.

As explained above, according to the present invention, in a harmonic filter device consisting of a plurality of unit harmonic filters each having resonance harmonics of different orders and configuring independent circuits, a unit capacitor in each unit harmonic filter is provided. The capacitor groups are separated for each phase and assembled on the same pedestal, and the capacitors of the same phase among these unit capacitor groups are stacked together via harmonic insulators, so that the original filter function can be achieved. It is possible to provide a highly reliable harmonic filter device that can significantly reduce the installation area while maintaining the above-mentioned characteristics, easily obtain sufficient mechanical strength, and reduce costs.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing an example of a harmonic filter device, Figure 2 is a circuit diagram showing an example of a harmonic filter device.
Figures a and b are a plan view and a front view showing an example of the arrangement of a conventional device, Figures 3 a and b are a plan view and a front view showing another example of the arrangement of a conventional device, and Figures 4 a and b. 1 is a plan view and a front view showing an embodiment of the present invention. 11a, 11b, 11e, 21a, 21b. 21 c, 31 a, 3 lb, 31 c・
...Unit capacitor group, 12, 22.32...
... Resonance accelerator, 4... Mount, 5...
...Ground insulator, 7...Harmonic insulator.

Claims (1)

[Scope of utility model registration request] In a harmonic filter device consisting of a plurality of unit harmonic filters each having resonance harmonics of different orders and configuring independent circuits, a group of unit capacitors in each unit harmonic filter is made independent for each phase. 1. A harmonic filter device assembled on a single pedestal, characterized in that out of these unit capacitor groups, capacitors of the same phase are stacked together with a harmonic insulator interposed therebetween.