JPH048177A - Multiple lightning generator - Google Patents

Abstract

PURPOSE:To block discharge from other IGs by juxtaposing a plurality of IGs, each having a diode comprising a plurality of voltage division resistors and discharge gaps, at the output end and then discharging the IGs with time difference. CONSTITUTION:Voltage of an initially operated IG-1 is blocked by a diode D2 from being applied on an IG-2 which thereby does not discharge. Consequently, voltage of the IG-1 is applied on a load. When the IG-2 operates 1-100mS later, voltage of the IC-2 is blocked from being applied on the IG-1 which thereby does not discharge. Consequently, voltage of the IG-2 is applied on the load Z.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a multiple lightning generator that applies an impulse voltage Ef] to a single sample at minute time differences of 1 to 100 m5.

2. Description of the Related Art Conventionally, in natural snow, there is a phenomenon of multiple lightning strikes in which lightning strikes multiple times at intervals of 1 to several IQms. Furthermore, during the alternating current interruption process of the circuit breaker, there is a phenomenon of re-ignition due to the restart voltage after the current is interrupted. In order to elucidate the effects of these phenomena on the insulation of power equipment, a multiple lightning generator is required.

Report of inventions or attempts to solve problems If you connect a plurality of impulse voltage generators (hereinafter referred to as IGs) with approximately the same rating to a single sample and try to apply approximately the same voltage with a minute time difference, an arbitrary one Individual IG
When viewed from above, the sample and other IGs constitute a parallel circuit, causing discharge to the other IGs as well, resulting in a significant change in the voltage applied to the sample. Therefore, some kind of element for preventing reverse discharge is required between each IG and the sample.

If, for example, an insulated needle end-bulb gap is used for the above element, the difference between the self-destructive discharge voltage and the minimum voltage that can be triggered is small, and the self-destructive voltage varies, making stable operation difficult. Furthermore, if a silicon rectifier is used as the above-mentioned element, it will be very expensive because it must withstand a large pulse current and an extremely high voltage. In the case of a rectifier, when the polarities of the voltages generated by several IGs are the same,
It is possible to withstand large pulse currents and ultra-high voltages, but when the polarities are different, there is no reverse voltage blocking function, and it is impossible to withstand large pulse currents and ultra-high voltages.

Means for Solving the Problems The present invention aims to solve the above problems, and
to the sample, and also connects the above IG to other IGs.
The purpose of this is to provide a function to prevent discharge from occurring, and the conventional method consists of a main capacitor, a charging resistor, a braking resistor, a discharge gap, a discharge resistor, an inductor for adjusting the wavefront length, or a capacitor for adjusting the wavefront length. A multiple lightning generator characterized by arranging a plurality of IGs each having a diode consisting of a plurality of voltage dividing resistors and a discharge gear at the output end of the IG, and discharging them with a time difference! It is.

First, multiple lightning generator! The equivalent circuit of is shown in Fig. 2.

FIG. 2(a) shows a case where an inductor is used for wavefront length adjustment, and shows an example using two IG-1 and IG-2.

Ro7 and RO2 are discharge resistors, C7 and C2 are each IG-1
, IG-2 main capacitor, charging resistor R91, R9
-2 is charged. R3I, R92 are each 1G series braking resistor, G1, G2 are IG starting dose gap device with trigger terminal (hereinafter referred to as starting gap), Ll, L
2 Wavefront length adjustment inductor 01.02 is a diode according to the present invention. TT2 is a terminal of a charging resistor, and 2 is a load.

Figure 2 (b) shows the wavefront length adjustment capacitor C61, CO2
In the figure (a), in place of the wavefront length adjustment inductor 2, L2, only the wavefront length adjustment capacitor C61, CO2 is used.
) is the same as

Next, the principle of the diode according to the present invention is shown in FIG. This figure shows an internal connection diagram for one IG using a wavefront length adjustment inductor. That is, a main capacitor C1, a series braking resistor R5H1, a wavefront length adjustment inductor, and a trigger capacitor CT to the starting gap of the diode and a trigger discharge gap G are provided at the top stage of the IG, which discharges in 12 stages. ing. In the figure, DG, DG,
DG is a discharge gap for a diode (hereinafter referred to as a diode gear amplifier), and a diode gap DG + is provided with an insulating needle end gap for a trigger. r is a voltage dividing resistor for making the diode voltage uniform; all the resistance values are equal and the two parallel voltage dividing resistors are connected to each gap in an alternating manner.

Operation The operation of the diode gap will be explained with reference to FIG. In this example, each stage is equipped with two capacitors of the same rating that are charged positively and negatively, and this is configured in 6 stages, and the IG discharges with the charging voltage of each main capacitor being E (V). Then, 12E (■) is generated at the output end, that is, the input end of the diode. In this example, the diode has a six-stage gap configuration of diode gaps DG1 to OG6, and a diode gap DG0 is further provided in the lower stage. Due to the discharge of IG, the voltage to ground of the upper electrode of diode gap DG, which is the first stage gap, is increased.Meanwhile, the trigger capacitor C is also charged with E (V), which is discharged and becomes the lower part of diode gap DG, tf. ! 13E (V) is applied to.

Therefore, there is +3E between the electrodes of the diode gap DG.
An overvoltage of -10E=3E (V) is applied, and the gap length is set so that discharge occurs at this voltage, so that the gap lengths of the diode gaps DG, DG2, and DG6 are all made equal. However, the diode gap D
If the gap length of Go is set to be equal to the gap length of the discharge cap G of IG, that is, it is set to discharge at 2E (V), as described above, if the diode gap DG is discharged, the diode gap DGo will be +2E. -10E
=2E (V) is applied and diode gap DG.

Also discharges.

Next, the potential of the upper electrode of the diode gap DG2 is set by the voltage dividing resistor, and the potential of the upper electrode of the diode gap DG1. When DGo discharges,
The potential of the lower electrode of diode gap DG2 is +2E
(V), so the diode gap OG2 has +2
E-8E=4 E (V) is applied and discharge occurs. below,
Similarly, diode gap DG.

The discharge continues with DG6, and a voltage of 125 (V) is applied to the load 2.

On the other hand, when the voltage generated by another IG (assumed 12E) is applied to the output terminal of the diode, an overvoltage per diode is applied to each gap of the diode.

Therefore, the operating voltage of each gap of the diode ■.

The range is 2E<V. It is sufficient to satisfy <3E, and this range is sufficiently wide for the diode gap to operate stably.

Embodiment An embodiment of the multiple lightning generator of the present invention shown in FIG. 1 will be described. IG-1 and IG-2 are IGs with the same rating,
IG-1 and IG-2 have a rated capacity of 6 μF and a rated voltage of 50 k.
Consists of 12 unit capacitors each with a rated voltage of 60 V.
0kV, total charging energy is 90kJ each.

The diode according to the present invention has a circuit configuration as shown in FIG. 3, and the electrode of each diode gap is formed in a hemisphere of 100 mmφ. and IG-1 or IG-2
When any one of them generates an impulse voltage, the voltage waveform applied to the load 2 is 1,2150 μs (wavelength/wavelength).

Load 2 has high impedance, but if dielectric breakdown occurs, it will become short-circuited, and current waveform adjustment inductor L and IG
The waveform is shaped by a braking resistor and a wavefront length adjustment inductor inside, and a lightning current flows with a waveform of 8/20 μs and a peak value of about 17 kA. E-1 and E-2 are chargers.

The functions of the diodes O3 and D2 are as described above, and the voltage of IG-1 that is activated first is blocked by the diode D2 and is not applied to IG-2, so that IG-2 is not discharged. Therefore, the voltage of IG-1 is applied to load 2.

And 1-100m! If IG-2 operates later,
The voltage on IG-2 is likewise blocked by diode O7 and is not applied to IG-1, so that 1G-1 does not discharge.

Therefore, the voltage of IG-2 is applied to load 2.

Effects of the Invention In the conventional multiple lightning generator, when two IGs are placed side by side and the first discharge is performed on the same load with a small time difference, the voltage of one IG is discharged to the other IG and the output is significantly increased. However, the multiple lightning generator of the present invention can generate multiple lightning by using the above-mentioned diode. can occur. This multiple lightning facilitates the elucidation of the catastrophic breakdown phenomenon, greatly contributes to the progress of insulation technology, and is of great industrial and practical value.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of the multiple lightning generator of the present invention;
2(a) and (b) are circuit diagrams for explaining the principle of the multiple lightning generator of the present invention, and FIG. 3 is a circuit diagram for explaining the operating principle of the diode used in the multiple lightning generator of the present invention. It is a circuit diagram. G-1, IG-2: Impulse voltage generator L: Current waveform adjustment inductor 2: Load Dl, D2: Diode E-1, E-
2: Charger C1, C2: Main capacitor Rol, RO2'' Discharge resistor R5I, R52: Braking resistor Rq+, R12: Charging resistor G,, G2: Impulse voltage generator starting spherical gap device Ll, L2: Wave crest Length adjustment inductor Co1, CO2
: Wavefront length adjustment capacitor T,, T2: Charging terminal r:
Voltage dividing resistor D Go “”” D Gs: Discharge gap for diode C Capacitor for Nidriger Gl Discharge gap for Nidriger

Claims (1)

[Claims] A diode consisting of a plurality of series gaps was provided at the output end of the impulse voltage generator, and the series gaps were alternately divided by two parallel voltage dividing impedances, and the first gap was connected to the charging system of the impulse voltage generator. A multiple lightning generator characterized in that a plurality of impulse voltage generators are arranged in parallel and are started by applying a trigger pulse generated by a starting pulse generator.