Abstract: A drone protection system that protects a drone from lightning strikes includes a Faraday cage enclosing the drone; and a wire capable of moving along the Faraday cage while maintaining connection with the Faraday cage with an end portion (connection unit) connecting to the Faraday cage.

Abstract: A measurement individual difference correction system for measuring voltage to ground includes a cable comprising a conductor, a floor panel provided on a floor and comprising a conductor, an oscillation circuit connected between the cable and the floor panel, and configured to output a signal, a voltage-to-ground measurement device comprising an upper electrode and a lower electrode positioned apart from each other, and configured to measure voltage between the upper electrode and the lower electrode, and a computation device in communication with the voltage-to-ground measurement device, in which the computation device calculates combined impedance of electrostatic capacity between the user and the cable, impedance of the user, and electrostatic capacity between the user and the upper electrode, by using voltage of the signal output from the oscillation circuit and the voltage between the upper electrode and the lower electrode measured by the voltage-to-ground measurement device.

Abstract: This lightning discharge induction system includes a flying object (1) flying in the air, a discharge electrode (11) provided to the flying object, a ground electrode (3) provided on the ground, an electric wire (2) connecting the discharge electrode (11) and the ground electrode (11), and a voltage control device (4) controlling a voltage generated in the discharge electrode (11). The voltage control device (4) includes a pulse power supply (41) for generating a pulse voltage, and a trigger switch (S1).

Abstract: A device includes a resonant voltage measurement unit 10 configured to input a predetermined frequency signal to a circuit including a fixed capacitance formed between a ground and a lower electrode, a variable capacitance formed between an upper electrode that is disposed above the lower electrode and the ground or between the lower electrode and the upper electrode, and a resonance inductor to measure a resonant voltage that is dependent on a current flowing in the resonance inductor when the variable capacitance is changed to cause the circuit to resonate, a pre-correction voltage-to-ground measurement unit 20 configured to measure a pre-correction voltage-to-ground that is a voltage between a measurement electrode, which is disposed at an equal height to the lower electrode and forms a capacitance-to-ground between the measurement electrode and the ground, and a measurement probe connected to a conductor, and a voltage-to-ground correction unit 30 configured to use the fixed capacitance, the variable capa

Abstract: A wearable measurement system includes a voltage measurement apparatus and a conversion coefficient acquisition apparatus, and measures a ground voltage of electromagnetic noise generated in a cable. The voltage measurement apparatus includes a lower electrode, an upper electrode arranged opposite to the lower electrode, and a voltage measurement circuit connected between the lower electrode and the upper electrode. The conversion coefficient acquisition apparatus includes a first lower electrode, a second lower electrode arranged side by side at the same height as the first lower electrode, an upper electrode arranged opposite to the lower electrodes, a voltage measurement circuit connected between the lower electrode and the upper electrode, and an oscillation circuit connected to the lower electrode and the upper electrode and outputting a signal of a predetermined frequency.

Abstract: An ungrounded measurement possibility determination device that determines whether to ground a measuring instrument when measuring a voltage to ground of electromagnetic noise includes a determination table 35 in which a relationship between a measured frequency and an allowable value of the voltage to ground has been recorded, a first electrode 31 arranged on a floor of a room where the voltage to ground is to be measured, a second electrode 32 arranged on the floor, an oscillation unit 33 that inputs a frequency signal having the same frequency as the measured frequency to the first electrode 31, a voltage measurement unit 34 that measures a voltage value of a frequency signal induced by the second electrode 32, and a determination unit 36 that compares the voltage value induced by the second electrode 32 with the allowable value and determines that it is unnecessary to ground the measuring instrument for measuring the voltage to ground at a corresponding frequency in a case where the voltage value is large

Abstract: To easily measure a voltage to ground of electromagnetic interference waves generated on a cable. A capacitance-to-ground measurement mechanism 10 includes a first electrode 11 and a second electrode 12 positioned at equal altitudes to be opposed to the earth, and a first voltage measurement device 15 to measure a voltage generated in a first resistance 14 connected between the first electrode 11 and the second electrode 12 by an output signal from an oscillation circuit 13. A voltage-to-ground measurement mechanism 30 includes a GND electrode 31 positioned at an altitude equal to that of the first electrode 11 and the second electrode 12 to be opposed to the earth, and a second voltage measurement device 33 to measure a voltage generated in a second resistance 32 connected between the GND electrode 31 and a probe 34 that is brought into contact with a cable core 106 as a measurement target.

Abstract: A measurement individual difference correction system for measuring voltage to ground includes a cable comprising a conductor, a floor panel provided on a floor and comprising a conductor, an oscillation circuit connected between the cable and the floor panel, and configured to output a signal, a voltage-to-ground measurement device comprising an upper electrode and a lower electrode positioned apart from each other, and configured to measure voltage between the upper electrode and the lower electrode, and a computation device in communication with the voltage-to-ground measurement device, in which the computation device calculates combined impedance of electrostatic capacity between the user and the cable, impedance of the user, and electrostatic capacity between the user and the upper electrode, by using voltage of the signal output from the oscillation circuit and the voltage between the upper electrode and the lower electrode measured by the voltage-to-ground measurement device.

Abstract: A common-mode voltage measurement apparatus according to an embodiment includes a measurement electrode attached to a conductor capable of being brought into contact with a coated cable, a measurement circuit configured to measure a common-mode voltage generated in the cable, and a compensation circuit connected in series between the measurement electrode and the measurement circuit, the compensation circuit being configured to compensate for a parasitic capacitive component formed between the measurement electrode and the conductor.

Abstract: A device includes a resonant voltage measurement unit 10 configured to input a predetermined frequency signal to a circuit including a fixed capacitance formed between a ground and a lower electrode, a variable capacitance formed between an upper electrode that is disposed above the lower electrode and the ground or between the lower electrode and the upper electrode, and a resonance inductor to measure a resonant voltage that is dependent on a current flowing in the resonance inductor when the variable capacitance is changed to cause the circuit to resonate, a pre-correction voltage-to-ground measurement unit 20 configured to measure a pre-correction voltage-to-ground that is a voltage between a measurement electrode, which is disposed at an equal height to the lower electrode and forms a capacitance-to-ground between the measurement electrode and the ground, and a measurement probe connected to a conductor, and a voltage-to-ground correction unit 30 configured to use the fixed capacitance, the variable capa

Abstract: To easily measure a voltage to ground of electromagnetic interference waves generated on a cable. A capacitance-to-ground measurement mechanism 10 includes a first electrode 11 and a second electrode 12 positioned at equal altitudes to be opposed to the earth, and a first voltage measurement device 15 to measure a voltage generated in a first resistance 14 connected between the first electrode 11 and the second electrode 12 by an output signal from an oscillation circuit 13. A voltage-to-ground measurement mechanism 30 includes a GND electrode 31 positioned at an altitude equal to that of the first electrode 11 and the second electrode 12 to be opposed to the earth, and a second voltage measurement device 33 to measure a voltage generated in a second resistance 32 connected between the GND electrode 31 and a probe 34 that is brought into contact with a cable core 106 as a measurement target.

Abstract: A common-mode voltage measurement apparatus according to an embodiment includes a measurement electrode attached to a conductor capable of being brought into contact with a coated cable, a measurement circuit configured to measure a common-mode voltage generated in the cable, and a compensation circuit connected in series between the measurement electrode and the measurement circuit, the compensation circuit being configured to compensate for a parasitic capacitive component formed between the measurement electrode and the conductor.