JPH0538531U - Lightning arrester discharge current recording device - Google Patents

Abstract

(57) [Abstract] [Purpose] A linear resistor discharges the discharge gap, eliminating the need for a coil, and reducing costs, reducing the number of assembly steps and easily replacing recording paper. It has a different structure. [Structure] A linear resistor 8 including a connecting portion 8b connected in series to a lightning arrester is molded, and a discharge gap g is discharged by a terminal voltage of the linear resistor to melt a metal foil 4a and a fusing length thereof. The current value of the recording paper 4 is recorded with and the protective gap 6 is connected in parallel to the linear resistor 8.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a discharge current recording device for a lightning arrester that records the discharge current of a lightning arrester.

[0002]

[Prior Art]

 FIG. 4 is a circuit diagram showing a conventional discharge current recorder of a lightning arrester. In the figure, 1 is a lightning arrester, 2 is a coil housed in a container 3 (see FIGS. 5A and 5B) due to poor weather resistance, Reference numeral 4 denotes a recording paper housed in a container together with the coil 2, and a discharge gap g is formed between the metal foil 4a of the recording paper 4 and the terminal. Since 5 is a structure in which the recording paper 4 and the coil 2 are housed in the same container 3 (see FIGS. 5A and 5B), a SiC resistor (non-linear) that secures a current path for inspection and replacement of the recording paper 4 Resistor), the SiC resistor 5 is connected in parallel to the coil 2. Reference numeral 6 denotes a protective gap connected in parallel to the SiC resistor 5. The protective gap 6 is provided in consideration of the case where the lightning arrester 1 operates again after the metal foil 4a of the recording paper 4 is melted. Reference numeral 7 is a discharge current recording device composed of a coil 2, a recording paper 4, a SiC resistor 5 and a protective gap 6, and this discharge current recording device 7 is a metal foil due to the energy of the arc current flowing between the discharge gaps g. 4a is melted.

Next, the operation will be described. The leakage current of the usual lightning arrester 1 is flowing through the coil 2. When the surge arrester 1 operates and a surge current flows, a terminal voltage (Ldi / dt) is generated across the coil 2, and this voltage causes the discharge gap g to discharge. The surge current flows through the metal foil 4a, and the current value is recorded by melting the metal foil 4a according to the magnitude of this surge current.

[0004]

[Problems to be solved by the device]

 Since the conventional discharge current recording device for the lightning arrester has the structure in which the coil 2 and the recording paper 4 are housed in the same container 3 as described above, the coil 2 which is the current path must be removed when the recording paper 4 is replaced. become. Therefore, the SiC resistor 5 is required as a current path when the container 3 is removed. Since the terminals of the SiC resistor 5 are connected by solder, there is a problem that the solder is peeled off. The reason for using the SiC resistor 5 is that no ordinary linear resistor has a short size and a high impulse withstand voltage and a large electric power. There was a problem that the line part was weak.

The present invention has been made to solve the above-mentioned problems, and discharges the discharge gap by the voltage generated in the linear resistor, thereby eliminating the need for a coil and reducing the cost. It is an object of the present invention to provide a lightning arrester discharge current recording device having a simple structure by reducing the number of assembling steps and easily replacing the recording paper.

[0006]

[Means for Solving the Problems]

 A discharge current recording device of a lightning arrester according to the present invention is formed by a linear resistor which is insulation-coated with a mold resin including a connecting portion connected in series to the arrester, and a metal foil having a discharge gap. The discharge gap is discharged by the terminal voltage applied to the metal foil, the metal foil is melted, and the current value is recorded according to the fusing length of this metal foil, and the metal foil is connected in parallel with the linear resistor. Is a protective gap that is used when the above arrester operates again after it has melted.

[0007]

[Action]

 The discharge current recording device of the lightning arrester in this invention discharges the discharge gap of the recording paper by the terminal voltage of the linear resistance antibody, melts the metal foil of the recording paper, and records the current value by the fusing length of this metal foil. It is a thing.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing an embodiment of the present invention. In FIG. 1, the same or equivalent components as in FIG. In FIGS. 1 and 2, reference numeral 8 denotes a linear resistor formed by molding a resistor unit 8a including a lead terminal connecting portion 8b with a synthetic resin 8c. The linear resistor 8 is generated when the breaker 1 is opened and closed. Impulse withstands the electric current that flows through the insulator surface while the insulator of the lightning arrester 1 is contaminated, with the discharge withstand capability of 2 ms square wave surge energy, and the impulse voltage withstanding the voltage generated during operation of the device. It has a withstand voltage and a resistance value. That is, as shown in FIG. 2, when the resistor unit 8a is used outdoors for a long time, its lead wire portion 8b is weak, and in order to improve the weather resistance, the resistor unit 8a is molded to improve the impulse withstand voltage. As shown in Table 1, the improved linear resistor 8 is formed.

[0009]

[Table 1]

Next, the operation will be described. The discharge gap g of the recording paper 4 is discharged by the terminal voltage of the linear resistor 8, the metal foil 4a of the recording paper 4 is melted, and the current value is recorded by the fusing length of the metal foil 4a. As shown in FIG. 3, the operating characteristics recorded in this way are 1 mm, 5 mm, 12 mm, and 50 mm, respectively, when the discharge voltage is 200 A, 500 A, 1100 A, and 2000 A.

Now, the linear resistor 8 has 3W, 500 / cmMAX, 90J / CC = 90J × 0. When a resistance of 4 ² × 2.5 = 113 J, 500 Ω is used, (1) If the tolerance is doubled to the discharge voltage of 1,5 KV of the protective gap 6, the current of 3 KV / 500 = 6 A is applied to the 500 Ω resistance antibody. , The energy of the surge (2 ms square wave) generated at the time of switching is 6 ² × 500 × 2 ms = 36 J, and there is no problem with the discharge withstand capability (considering the energy withstand capability of the switching surge of 2 ms).

(2) The AC withstanding capacity W is (100 mA0-p / 2 ^1/2 ) ² × 500 = 2.3 W, and therefore the AC withstanding capacity (100 m in consideration of the current flowing in a state where the insulator is soiled). There is no problem with A0-p.).

(3) The impulse withstand voltage has a maximum of about 5 KV when the apparatus operates as shown in Table 1 as a result of actual measurement, so there is no problem.

(4) The operating characteristics are the same as the present.

[0015]

[Effect of the device]

 As described above, according to the present invention, the linear resistor including the connecting portion connected in series to the arrester is insulation-coated with the molding resin, and the discharge gap is discharged by the terminal voltage of the linear resistor to remove the metal foil. The current value of the recording paper is recorded by melting and the fusing length, and a protective gap is connected in parallel with the above linear resistor. There is an effect that the cost can be reduced because it is unnecessary, the number of assembly steps can be reduced, the recording paper can be easily replaced, and the structure can be simplified.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a discharge current recording device for a lightning arrester according to the present invention.

FIG. 2 is a sectional view showing a state where the linear resistor shown in FIG. 1 is molded.

FIG. 3 is a characteristic diagram illustrating the operation of a discharge current recording device.

FIG. 4 is a circuit diagram showing an example of a conventional discharge current recording device for a lightning arrester.

5 shows an outer shape of an electric discharge recording apparatus provided with a container containing the coil and recording paper shown in FIG. 4, in which A is a side view,
B is a front view.

[Explanation of symbols]

1 ... Lightning arrester, 4 ... Recording paper, 4a ... Metal foil, g ... Discharge gap, 6 ... Protective gap, 8 ... Linear resistor.

Claims (1)

[Scope of utility model registration request] 1. A linear resistor which is insulation-coated with a molding resin including a connecting portion connected in series to a lightning arrester, and a terminal voltage which is formed by a metal foil having a discharge gap and is applied to the linear resistor. The discharge gap is discharged to melt the metal foil, and the recording paper that records the current value at the fusing length of this metal foil is connected in parallel to the linear resistor, and the lightning arrester operates again after the metal foil has melted. Discharger current recording device with a protective gap used in the event of a surge.