Importance

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Abstract

An electric fence energiser is intended to reduce exposure of an animal tangled in the fence line to high power deterrent pulses for an indefinite period. The energiser is arranged to along the fence line, sense a characteristic associated with said evaluation pulse(s) that varies with load on the fence line, and set a threshold value based on said sensed characteristic, send one or more further low power evaluation pulses along the fence line, sense a characteristic associated with the evaluation pulse(s) that varies with load on the fence line, compare the sensed characteristic to the threshold value, and when a change in the sensed characteristic relative to the threshold value indicative of an animal in contact with the fence line is detected, send one or more but not more than a predetermined maximum number of higher power deterrent pulses along the fence line, subsequently send one or more further low power evaluation pulses along the fence line, sense a characteristic associated with the evaluation pulses that varies with load on the fence line, and either re-evaluate and optionally reset the threshold, or set a new threshold value, and continue to send further low power evaluation pulses along the fence line and sense a characteristic associated with the low power evaluation pulse(s) that varies with load on the fence line, and compare the sensed characteristic to the current threshold value, and send one or more further but not more than a predetermined maximum number of higher power deterrent pulses along the fence line if a change relative to the threshold value is again detected.

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First Claim