JPS60185172A - Low surge impedance earth electrode and measurement thereof - Google Patents

Abstract

PURPOSE:To enable accurate measurement, by forming a low surge impedance earth electrode by a good conductive metal tube embedded in the ground and radial conductors on the earth's surface and connecting a plurality of current passing measuring electrodes to said earth electrode to supply a surge current. CONSTITUTION:A good conductive metal pipe 1 having a large diameter 18 is embedded from the earth's surface and earth wires 2 are radially arranged to the upper part of said pipe 1 to be connected thereto at points 3. A conductor 5 is attached to the metal pipe 1 so as to be able to be connected to an object to be earthed from a conductor lead-out point 4. As a result, a low surge impedance earth electrode is obtained. A surge current is supplied to said earth electrode from a generator 8 through an ammeter 9 and a measuring current is flowed to current passing auxiliary electrodes 13-16 through pipe like twisted electric wires 11. Generated earth potential generated at this current supply time is detected by a voltage detection electrode 17 through a voltmeter 10. As a result, surge impedance can be accurately measured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a low surge impedance ground electrode and a method for measuring the same.

Hereinafter, to explain with a diagram, a highly conductive metal pipe 1 with a diameter of 18 shown in Fig. 1 is buried at a depth 7 of 0.5 to 1 m from the ground surface 6, and a ground wire 2 is radially connected to the top of the pipe. If a wire is attached and pulled out from the conductor lead-out point 4 to connect it to the grounding target, low surge impedance grounding can be achieved.

Furthermore, as shown in Fig. 2, even if a highly conductive metal strip or wire 1' is buried in a cylindrical shape with a large diameter 18 and a conductor is connected, the result will be the same as the ground electrode shown in Fig. 1. It has the effect of

To measure the surge impedance of the ground electrode 1 shown in the plan layout of FIG. 3, a surge generator 8 is connected to the ground electrode through an ammeter 9 with a wire 11, and the other end is connected to a pipe-shaped fuel wire with a synthetic resin core. Current-carrying auxiliary pole using 11, 13,
14, 15, 16, etc., and a measuring current is applied.

The ground potential generated when the current is applied is detected through a voltmeter (oscilloscope) 10 and connected to a voltage detection pole 17 via wiring 12.

Surge impedance Z is expressed as V/I.

A lightning strike is the neutralization of the electric charge at the bottom of the earth and the electric charge induced on the ground surface, and the current that rises at that time is the same. Therefore, surge impedance can be measured accurately by providing multiple current-carrying auxiliary electrodes to closely reproduce this. be able to.

[Brief explanation of the drawing]

Figure 2 shows a combination of a large diameter cylindrical ground electrode and a radial ground wire, Figure 2 shows the case where a wire or strip is used as the diameter ground electrode, and Figure 3 shows the measurement arrangement of the ground electrode. The top view of the line is shown. 1. Cylindrical installed pole 1', constituent material of radial grounding electrode 2, radial grounding wire 3, grounding point 4 between grounding electrode and grounding wire, connection point 5 of grounding conductor, grounding conductor 6, ground surface 7, electrode and ground Wire burial depth 8, surge generator 9, ammeter (oscilloscope) 10, voltmeter (oscilloscope) 11, synthetic resin core cylindrical combustion current wire 12, voltage detection wire 13, current carrying auxiliary pole 14, current carrying auxiliary Outside information on pole 15, current carrying auxiliary pole 16, current carrying auxiliary pole 17, voltage detection auxiliary pole 18, and grounding electrode Applicant: Tadashi Fujii ■

Claims (1)

[Claims] A low-surge impedance grounding electrode and a current-carrying electrode for measurement are installed by burying a long cylinder or cylindrical strip or wire made of a highly conductive material in the ground, and connecting a ground wire radially to the end of the surface of the ground. A measurement method that consists of multiple or more methods.