Abstract: Power line transient suppressing circuits which use inductors in series w the load to reject or attenuate transients on the power line over a wider range of transients than with prior devices, and also serve as inrush current limiters. Two unidirectional current circulating diode-inductor loop circuits eliminate the 60Hz voltage drop across the inductors. Normal operation is not affected by the circuits, but transients are rejected by the inductors.

Abstract: A system for measuring the transfer immitances, impedance and admittance, a linear electrical network having one or more ports. The system utilizes clamp-on ferromagnetic cores to electromagnetically couple the transfer immitance measuring system to the electrical network without having to interrupt the normal on-line operation of the electrical network. A high frequency injection network, which includes a high frequency signal generator and a multichannel amplifier, injects a high frequency signal into each of the ports of the electrical network. High frequency voltage and current measuring networks are electromagnetically coupled to each of the ports of the electrical network to measure the high frequency component of the port voltage and the port current.

Abstract: A parametric energy coupling system for providing uninterruptible a-c power o electrical loads. In a normal mode, a parametric transformer couples a-c line power directly from an a-c power source to a load. Upon a power outage occurrence, an inverter is energized whereby a-c power is generated from a d-c source and applied to the load.

Abstract: A dynamic wave energy extraction system utilizing a suspended weight to extract energy from ocean waves. A spring-biased floating sheave is disposed to move with respect to a pair of guide posts attached to a ship. A cable having a submerged weight attached to one end thereof passes across the sheave and attaches at the other end to the ship. The spring, cable and weight are tuned to match the predominant heave frequency of the ship, thereby exciting the cable system producing maximum dynamic tension variations in the cable. The tension variations force the floating sheaves to move along the guide posts in an oscillatory or reciprocating manner, thus extracting the maximum amount of energy from the waves.

Abstract: An automatic blade angle controller system capable of maintaining a blade an earth-working tool level with the ground. A transparent, closed manometer partially filled with an opaque liquid is contained in an opaque enclosure. A light source is located within the perimeter of the manometer. Two solar cells are located on opposite sides of the enclosure in such manner that the light from the light source must pass through the manometer before impinging on the solar cells. The opaque liquid partially blocks the light from impinging on the solar cells. The voltages from the solar cells are subtracted resulting in an error signal. Of course, when the two voltages are of equal value, no error signal is produced, thereby establishing a level reference position for the enclosure. The enclosure is rigidly affixed to the blade, thereby establishing a reference position for the blade. A servo-hydraulic system returns the blade to its reference position upon receipt of the error signal.

Abstract: A transient direction detector which indicates the occurrence of power line ransients and their direction of propagation. The system is comprised of current and voltage sensors, a logic and control circuit which receives the transient current and voltage sensed and provides an output to an indicator circuit to show the direction of any transients on a power line. The current sensing circuit receives an input from an induction coil on an iron clamp around a power line. The voltage sensing circuit receives its input from a voltage sampling transformer directly connected across a power line. The logic and control circuit determines where the transient occurred by comparing the polarity received from the transient current and voltage sensing circuits.

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.

Abstract: A base insulator design for VLF antennas. A surface insulating material, h as glass, serves to provide a long surface distance between the upper and lower metallic components of the base. A thin, soft metal cover extends the base metal conductor out to the edge of the outer insulator and also provides a weather shield for the internal components. An insulator core of porcelain serves to take up all of the mechanical stress in the structure and a dielectric fluid serves as a coolant which also protects the inside surface from contamination.

Abstract: A circuit for detecting the level of oil in an oil-collecting chamber conning oil floating on water. A pair of electrodes are disposed in the oil-collecting chamber for detecting the presence of oil therein. A sensing circuit, connected between the electrodes and an amplifier, contains a sensing current when water or air surrounds the electrodes. The amplified sensing current switches a transistor on transmitting a d-c voltage to an open type solenoid valve located in an outlet tube thereby closing the valve.