Abstract: An automatic electrical load matching device for applying loads to wind den generators. The device switches five different loads to the output of a wind driven generator. Each load corresponds to a range of speeds of the wind driven generator's rotor.

Abstract: A constant illumination level control system for continuously adjusting the evel of artificial illumination in an area of controlled lighting to complement available natural illumination. A photocell sensor in combination with an input amplifier generates a voltage representative of the illumination level in the area of controlled lighting. This illumination level voltage is compared by a comparator with a reference voltage, a non-zero difference voltage output from the comparator being indicative of a change in the illumination level from a desired, preset level. The output from the comparator is applied to a solid state dimmer circuit which, by controlling the gating of a triac, regulates the electrical energy input to the artificial lighting system. In response to a non-zero difference voltage output from the comparator, the solid state dimmer circuit, in combination with the triac, adjusts the artificial illumination output to reestablish the desired, preset level of total illumination.

Abstract: A detector for locating the direction of propagation of transients on eleical power lines supplying critical loads having various types of random impulse voltage transients. The device detects the polarity of transient voltages and the direction of transient current. An integrated logic and control circuit compares the sampled voltage and current to indicate from which direction the transient came. The logic and control circuit activates indicator lights which show whether the transient occurred in the direction of the source or the load and whether the transient was positive or negative.