JPS5916304A - Nonlinear resistor - 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 [Technical Field of the Invention] The present invention relates to a nonlinear resistor used in an undervoltage protection device, especially in a single-stroke system.

[Technical outlook and problems of the invention]

In order to remove the voltage from the electrical system (pulled to normal voltage) and to protect the ``air system'' and ``tankiki'', overload voltage such as surge absorbers and protectors should be installed. Seven protective devices are used.

This overpressure protection device exhibits almost insulating properties for positive 1.6 wires, and when overpressure is applied (2 is a relatively low resistance value, 2 is a non-11 wire resistance The body is used.

The nonlinear resistor is formed by pressing and molding a mixture of silicon carbide (Sin) or zinc oxide (ZnOJi bimetallic compound, and then deposited at the bottom of a mine) at 4°C.

ZnO-based nonlinear resistors have a steep non-linearity in the small region (2) and a sharp rise up to the large region (2), so SiO-based nonlinear resistors Using this, it is possible to create an overvoltage protection device that is more sophisticated than the existing overvoltage protection device.

When this ZnO-based nonlinear resistor is used in the middle, the resistance layer on the side surface of the nonlinear resistor decreases.

In other words, there is a problem that the non-linear index α is significantly impaired, and conventionally, a quotient resistance layer containing zinc silicate and curved lead antimonate as main components is provided on the side 1n1 of the non-linear resistor, or, Furthermore, by providing Nigarasu No. 1 (Nigarasuno 1), not only the same t tUf and the same as above, but also the prevention of creeping flash was attempted.

However, the conventional non-i11.7 resistor still has an increase in resistance and poor adhesion with the glass layer (2. Impulse has a low drop and a leakage current problem in a low overlap region). However, it had the disadvantage of poor nonlinearity.

[Purpose of the invention]

The present invention addresses the above-mentioned drawbacks (knees) and provides a non-linear resistor with improved impulse withstand capability and non-self-linear characteristics.

[Embodiments of the invention] Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

Zn095.5 mol% + B12o30.5 mol%
, 5b2(J++ 1.0 mol%, = NiO1,0
Mol%, Cr2O30.5mol%, Co2030
．． 5 mol% + MnO20.5 mol% + 5102
Weigh and mix in a ball mill at a ratio of u and s mol%. At this time, the oxide and an organic binder such as polyvinyl alcohol are mixed simultaneously. The mixture thus obtained is placed in a dry granulation oven, e.g. a spray dryer, and
Make into spherical particles. Press this powder mixture (two times,
For example, 5i02, 5b203 and Bi2O
An oxide paste mixed at a molar ratio of 70 to 20 is applied to the side surface of the former self-molded body, and fired at, for example, 1200°C. In this way, zinc oxide (Zn25104) and antimony e + lead (Z
On the side surface of the sintered body on which the resistance layer was formed, the main component of which was n7Sb20I2) was a low melting point lead glass frit.
mJ, a mixture slurry of alumina, silica and feldspar mixed at a ratio of 10 mJ each as a refractory filler is applied and fired at, for example, 500"O to form a resistance layer. After that, several layers are applied to the surface. , spray an aluminum electrode to form a non-linear resistor.

The electrical characteristics of the nonlinear resistor obtained in this way are
As shown in Fig. and Fig. 2.

Fig. 1 shows the pass rate when impulse (4 x 10 us)'4 current was applied, and Fig. 2 shows the current characteristics. In each figure, a solid line A and a broken line B indicate the characteristics of the conventional and inventive nonlinear resistors, respectively.

As is clear from FIGS. 1 and 2, the nonlinear resistor of the present invention has significantly improved impulse performance and nonlinearity compared to the conventional nonlinear resistor.

In the present invention, such excellent properties are obtained because the reduction of oxygen ions on the surface of the zinc oxide particles that occurs during baking is reduced by mixing and dispersing the 1iltj pyrophoric filler in the low melting point lead glass. Prevent and reduce leakage current? ,
It is thought that adding a refractory filler improves the nonlinearity and also increases the specific resistance of the low-melting point lead glass (secondarily, the specific resistance of the glass alone is higher than that of glass alone, improving the impulse withstand capacity).

Furthermore, because of the use of inexpensive refractory fillers, compared to using only expensive low melting point lead glass flint,
It is also advantageous in terms of cost.

The low melting point lead glass frit conveniently used in the present invention is P
bO is 60 to 950, SiO2 is 05 to 10, B2O3 is 3 to 20% by weight, and A4ox is O20.
) to 10 weights, contained within the range of -C.

PilO is smaller than 60LO, -chita 5in2 and A
4 (Ja is 10% by weight, B20y is 2 (11 (i:
% j') increases, the softening point of the glass and the working tolerance increase, resulting in a disadvantage that nonlinearity worsens. The reason for this is that when the baking temperature exceeds 850'O, the temperature rises above the melting point of Bi2O (approximately 820'0) (Second 9, Bi2C contained in the nonlinear resistor).
If l3 causes a circular change and disturbs the once stabilized grain boundary layer υ, the excellent nonlinearity shown in FIG. 2 cannot be obtained. On the other hand, PbO has more p than M1% since 95, and 5
102 and Al2O3 are below 0.5, BtOs is 3
Satogi Goose is also small - If you like it, the glass mesh structure 1+...
L collapses, causing cracks and peeling in the epithelial membrane, as shown in Figure 1.
Excellent impulse vibration resistance cannot be obtained.

In addition, the content of the effective low melting point lead glass frit and the type of refractory filler range from 5 to 95%.
The fire-retardant light agents that account for % by weight are alumina, silica, magnesia, zirconia, and mullite.

It was confirmed that at least one of cordierite, Nagawa, talc, and Saizando was more than one pongee.

Unrealistic 1U example (-Oi ℃, content rate of zinc oxide in non-linear resistor, composition and content rate of oxide, ml composition and rate of 4-I of oxide that forms a high resistance layer) is not limited to the above embodiments.

Furthermore, it goes without saying that the conditions of the process are not limited to 11.

(Effects of the Invention) According to the above-mentioned and seven-part method, it is possible to provide a non-linear #i resistor with improved one-pulse resistance M and non-linear characteristics.

[Brief explanation of the drawing]

Figures 1 and 2 are a diagram of the impulse resistance of a non-straight resistor according to IFII 91, which is a part of the present invention, and a diagram of the pressure-current characteristics.

Claims (3)

[Claims] (1) A non-linear resistor whose main component is zinc chloride; insulated on at least the side surface of the viscous body; A first resistance layer containing Zn?5b2012) as a main component, and a
Consisting of a second resistance layer produced from a (#, sound material) of low-melting fish boat crow frit with a softening point of 0 to 900'C+ and a refractory filler (:zf characteristics and 4- Ursu resistance 4V1 [. (2) Low melting point lead glass frit contains 60-95% lead oxide (PbO) and 0.0% silicon oxide (SiOz).
5 to 10 pieces of candy, boron oxide (B203), 3 to 20 parts, and aluminum oxide (Ax203), containing 5 to 10 parts of aluminum oxide (Ax203), and a low melting point lead glass frit in the mixture. The non-linear resistor according to claim 1, characterized in that it occupies 95 times. (3) Menshi fire Jki'i+ r:! I is aluminum two,
Shiritsuno, magnesia, zirconia, no-lite, cordierite. The nonlinear resistor according to claim 1, characterized in that it is made of at least one of feldspar, Melk, and clay.