Okaya Surge Absorbers
RAV, RAV-LD SERIES
RAV was developed to absorb high current surge such as indirect lightning. Specifically, the RAV applied to communication circuits will protect it. The RAV is suitable for use with equipment which requires high reliability protection from external surges.
- Response time: 50ns max.
- Life: Possible to absorb 1000A for 300 times repeatedly (Surge wave form: 8/20 ps).
Click here to view V-T Characteristics
Since the indirect lightning surges entering telecommunication lines have the same voltage and phase, the measures to be taken against the surge must involve placement of a surge absorber between the lines and ground.
For example, in the case of the two-line system shown in the accompanying illustration, the gas arresters Al, A2 are inserted in the lines Li -E and L2-E in order to protect the system, but in this kind of arrangement, there may be a difference in the response time of the elements.
Measurement of Transverse Surge:
A three-pole type of surge absorber is used here 
to protect a telecommunications line. A comparison can be made between the transverse surges in the gas arrester made by another manufacturer and in Okaya’s RAV-361 LD, thus allowing an evaluation of the performance of the respective products.
Measurement Circuit
Measurements are made with the circuit shown below, and by observing the current waveform on an oscilloscope
Measurement Results
The gas arrester produced a transverse surge with a width of about 3-4ps, and the generation of that surge is facilitated in cases where the dv/dt is precipitous and voltage is not so great. This surge generation is a result of the V-T characteristics. In contrast, the RAV type resulted in virtually no transverse surge at all.
In general, indirect lightning surge is called "longitudinal surge"; in contrast, the surge caused by the difference in element operating time is called "transverse surge." This condition is illustrated below. The important thing is to prevent the generation of this transverse surge.
RAV-LD (For protecting network lines)
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