JPS62133708A - Pulse capacitor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a pulse capacitor.

[Conventional technology]

Conventionally, laminated mica (mica paper) has excellent withstand voltage characteristics.
A wound capacitor impregnated with electrically insulating oil as a dielectric is a pulse forming network (PEN).
It is used as a capacitor, etc.

[Problem that the invention seeks to solve]

However, such capacitors are subject to mechanical vibrations for a long time due to electromagnetic field vibrations generated during discharge, and there is a risk that the scales of the aggregated mica, which is the dielectric material, will fly off, resulting in poor insulation.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pulse capacitor that has a small dielectric loss tangent (tan δ) and is resistant to vibrations caused by pulses and the like.

[Means for solving problems]

In order to achieve the above object, the present invention has developed a composite dielectric material obtained by sandwiching a vibration-resistant dielectric material such as aggregated mica between dielectric materials that have the property of swelling with electrical insulating oil, etc. It is characterized by being wound or laminated with the electrode, tightened, and impregnated with electrical insulating oil, etc.

[For production]

By configuring as described above, the adhesion between the dielectrics is increased by the impregnated electrical insulating oil, etc., and mechanical strength is provided against oscillating electromagnetic fields such as pulses.

〔Example〕

An embodiment of the present invention will be described below.

Figure 1 shows the configuration of a wound capacitor element 1.
A composite dielectric 4 is formed by sandwiching both sides of the dielectric 2, which is weak against vibration, between dielectrics 3, 3, which have the property of swelling with electrical insulating oil, etc., and a metal foil electrode is placed between the composite dielectrics 4, 4. A suitable number of layers are stacked with 5 in between and wound to form a non-inductively wound element.

Note that as the dielectric material 2 which is weak against vibrations, for example, a composite mica called mica paper or paper with weak bonding force is used, and as the dielectric material 3 which has the property of swelling with electrical insulating oil or the like, Organic films such as polypropylene, polyethylene, and polyvinylidene fluoride are used. Further, as the electrical insulating oil, polybdenum oil, polybdenum oil, etc. are used.

Figure 2 shows the wound type capacitor element 1 constructed in this way.
For tightening, a plurality of capacitors are mounted on the jig 10 and connected in series or in parallel to obtain a predetermined capacitance.

That is, the tightening jig 10 is such that a plurality of columns 12 are planted on a -3-board 11, a presser plate 13 is inserted into the upper part of the columns 12, and a nut 14 is attached to the upper end of the column 12.
A plurality of wound capacitor elements 1 are stacked on a substrate 11, the upper part is held down with a holding plate 13, a nut 14 is screwed onto the support 12, and a plurality of wound capacitor elements 1 are screwed together. Tighten the wound capacitor elements 1, connect these capacitor elements 1 in series or parallel, impregnate this with electrical insulating oil, make the dielectric 3 absorb the electrical insulating oil and expand,
A dielectric body 2 sandwiched between dielectric bodies 3 is firmly brought into close contact with the dielectric body 2.

The capacitor thus impregnated with electrical insulating oil is then shaped by known means to obtain a pulse capacitor.

In this way, when the wound capacitor element 1 is tightened using the jig 10, the vibration of the capacitor element generated by the steep electromagnetic field can be suppressed. The dielectric material 3, which has the property of swelling with electric insulating oil, swells, and in order to further firmly adhere the dielectric material 2, which is weak against vibrations such as laminated mica, which is sandwiched between them, the scales of the laminated mica are swelled with electric insulating oil. This prevents the capacitance from scattering inside the capacitor and maintains stable capacitance over the long term.

FIG. 3 shows the change over time in the dielectric loss tangent (tan δ) of the pulse capacitor A according to this embodiment and the conventional pulse capacitor B made only of assembled mica, and shows the change over time in the dielectric loss tangent (tan δ), respectively.
It shows the results of testing each individual item.

As can be understood from this, the dielectric loss tangent of capacitor A in this example was about 0°02% at the start of the experiment, and it remained stable with almost no change over time. , conventional capacitor B is about 0.0 at the start of the experiment.
5%, but the value increases with time and becomes 0.5% or more after approximately 5,000 hours of light use, making it impossible to obtain long-term stability. Furthermore, the capacitor of this example has a dielectric loss tangent about 173 smaller than conventional capacitors, and generates less self-heating.

In the above embodiment, a wound type capacitor was described, but a laminated type capacitor may be used, and although a plurality of capacitors are tightened and impregnated, a number of - capacitors may also be used. Further, the tightening jig is not limited to the above embodiment.

In addition, if composite mica is used as the dielectric material 2, which is weak against vibration, and polyvinylidene fluoride is used as the dielectric material 3, which has the property of absorbing electrical insulating oil etc. Due to its withstand voltage characteristics, it is possible to obtain high-voltage, large-capacity capacitors.

〔Effect of the invention〕

As described above, the present invention consists of sandwiching a dielectric material weak against vibration with a dielectric material having a property of swelling with electrical insulating oil, etc., to form a composite material, and then winding or laminating the composite dielectric material with a metal foil electrode and tightening the material. Since it is impregnated with electrical insulating oil or the like, it increases the adhesion between the dielectrics, has mechanical strength against oscillating electromagnetic fields such as pulses, and achieves long-term stability.

[Brief explanation of drawings]

The figures show one embodiment of the pulse capacitor of the present invention. Fig. 1 is a perspective view showing the configuration of a wound capacitor, and Fig. 2 shows a plurality of wound capacitors arranged one on top of the other and tightened. FIG. 3 is a graph comparing the dielectric voltage contact of a pulse capacitor according to an embodiment of the present invention and a conventional pulse capacitor made of a dielectric made only of integrated mica. DESCRIPTION OF SYMBOLS 1... Wound capacitor element 2... Dielectric material weak against vibrations 3... Dielectric material having a property of swelling with electrical insulating oil etc. 4... Composite dielectric material 5... Metal foil electrode 10...・Tightening is done using a jig patent.Applicant: Soshin Electric Co., Ltd.It is also possible to fix the first opening and fix the cable.

Claims (1)

[Claims] 1. A composite dielectric obtained by sandwiching a vibration-resistant dielectric such as laminated mica with a dielectric that swells with electrical insulating oil, etc. is wound or laminated with a metal foil electrode and tightened, A pulse capacitor characterized by being impregnated with electrical insulating oil, etc.