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| Number | Title | Issue Date |
| 7295415 | Circuits for circuit interrupting devices having automatic end of life testing function The present invention provides a set of circuits which is capable of performing an automatic check on main components of a circuit interrupting device when the circuit interrupting device is properly powered and the device is at a tripped state to determine whether ... | 11/13/2007 |
| 7265956 | Ground fault circuit interrupter containing a dual-function test button The present invention provides a circuit interrupting device, preferably a ground fault circuit interrupter (GFCI), which contains a dual-function test button having a short pole and a long pole positioned underneath the dual-function test button. When the GFCI is p... | 09/04/2007 |
| 7164079 | Preferential separable overhead electric service drop and associated method An overhead service drop extending between a utility pole and a customer location includes at least one power conductor, a neutral conductor messenger supporting itself and the power conductor, and a separable power connector between the power conductor and a corres... | 01/16/2007 |
| 6965676 | Volume-responsive loudness compensation circuits, systems, and methods An audio compensation system (20) for producing a sound compensated output signal (So). The system comprises a volume control circuit (24) for producing a volume-adjusted signal (Sic) by applying a volume adjustment to an audio si... | 11/15/2005 |
| 6932624 | Modular signal and power connection device An electrical connection box for wall mounting provides a recessed external plug for receiving or transmitting power to electronic components. The connection box is configured to receive a variety of signal connection modules for interconnecting associated audio/vis... | 08/23/2005 |
| 6888709 | Electromagnetic transient voltage surge suppression system Three single-phase transformers are provided, the primary sides connected in a Wye configuration. One terminal on the primary side of each transformer is coupled to a reference node and the other terminal on the primary side of each transformer is coupled to one pha... | 05/03/2005 |
| 6760208 | Distributive capacitor for high density applications A distributive capacitor 205 and impedance matching network 201 and transmitter 101 that use the capacitor and are suitable for high density integration applications include a printed circuit substrate 303 comprising one of a printed circ... | 07/06/2004 |
| 6744255 | Grounding device for electric power distribution systems A grounding and testing device for power distribution systems includes an electrically insulated housing with a bore that extends from an aperture at a front of the housing towards a rear of the housing. An electrical contact is disposed at least partially within th... | 06/01/2004 |
| 6724014 | High-voltage hybrid circuit A hybrid semiconductor circuit adjustable by a control current for controlling voltage comprising a single high-voltage reversely polarized diode surrounded by at least two diodes emitting infrared radiation fed in series by the control signal and arranged to allow ... | 04/20/2004 |
| 6697239 | Ground fault circuit interrupter for coaxial drop cable and method of operation A protective system for reducing the possibility of injury to individuals or damage to electrical equipment due to a fault in a coaxial drop cable connected between a tap unit receiving both RF signals and AC power from a main distribution line and a prem... | 02/24/2004 |
| 6532140 | Arc-fault detecting circuit breaker system An arc-fault detecting circuit-breaker system includes a normally closed line circuit breaker in series with a protected electrical circuit element whose current flow is to be interrupted upon the occurrence of an arc fault. A detector senses the rate of ... | 03/11/2003 |
| 6411487 | Coaxial surge protector having thermal fail-safe shunt A coaxial surge protector includes a housing in which is situated a transmission line in the form of a two-sided printed circuit board. The surge protector includes input and output signal connectors mounted on a housing and connected to the transmission ... | 06/25/2002 |
| 6342998 | Data surge protection module A data surge protection module can be added to data and control networks not having such surge protection. The use of quick connect/disconnect connectors allows for the rapid installation and/or replacement of such modules. A built-in ground plate and a b... | 01/29/2002 |
| 6266224 | Broadband coaxial overvoltage protector A broadband coaxial overvoltage protector includes a short-circuit line segment connected in parallel with a coaxial line section, a transforming coaxial line section with a length | 07/24/2001 |
| 6147851 | Method for guarding electrical regions having potential gradients A multi-potential guarding technique for preventing electrical charge exchange to or from an electrical system containing potential gradients and sources of electrical noise. An inner electrically conductive guard shield surrounds the system to be guarded... | 11/14/2000 |
| 5953195 | Coaxial protector A protector which is coupleable with a coaxial transmission line. The protector includes a gas tube assembly. The gas tube assembly has a first electrode which is coupleable with the inner conductor of the coaxial transmission line such that the first ele... | 09/14/1999 |
| 5898558 | Protective overload device A protective overload device (POD) that absorbs energy and reduces the damage to transmission towers resulting from sudden conductor, shield wire, insulator, or conductor suspension failures is herein disclosed. The POD is positioned between the non-energ... | 04/27/1999 |
| 5812353 | Current limiter for electrical transmission/distribution protection systems A current limiter arrangement particularly adapted to be positioned at a substation of an electrical power system for limiting the fault current for a predetermined period of time to permit protective devices positioned downstream in the network to clear ... | 09/22/1998 |
| 5793593 | Method and apparatus using a five-wire network for distribution of electrical power The present invention features a method and an apparatus for distributing electrical power from a power source to a distribution transformer, using at least one hot-phase conductor, a neutral conductor and an independent ground conductor. The neutral cond... | 08/11/1998 |
| 5793590 | Coaxial cable protection device A coaxial drop cable safety device is used for cable television, data and telephony applications. The device is used on buried drop cable where 60 Hz powering voltages applied to the drop cable exceed low voltage safety limits and where the drop cable is ... | 08/11/1998 |
| 5790361 | Coaxial surge protector with impedance matching A surge protector (1) for a coaxial transmission line is constructed with a pair of coaxial connectors (2) mounted on a conducting hollow body (4), and a transmission line conductor (3) with a resilient beam portion (12) to engage and urge a surge protect... | 08/04/1998 |
| 5786974 | Apparatus for and method of suppressing power surges utilizing electrical striplines A method and apparatus for suppressing surges in an electrical power distribution system utilizing stripline techniques. The apparatus includes an input terminal which connects a phase electrical power source to a TVSS device. A stripline circuit connects... | 07/28/1998 |
| 5754382 | Gas insulated switchgear and power transmission system using the switchgear A power transmission system includes a transmission line unit for three phases connected to three gas insulated transmission lines and a standby transmission line unit for a phase connected to a standby gas insulated transmission line connected with each ... | 05/19/1998 |
| 5638244 | Apparatus and methods for generating uninterruptible AC power signals A broadband communications network having an uninterruptible power supply. The power supply has one input connected to AC line voltage and another input connected to a gas powered electrical generator. The power supply contains an uninterruptible power su... | 06/10/1997 |
| 5566040 | Protection arrangement for an electronic device sensitive to electromagnetic radiation A protection arrangement for an electronic device sensitive to electromagic radiation comprises a single printed circuit board which is disposed within a metal casing so that it passes perpendicularly through a metal partition separating an upstream zone... | 10/15/1996 |
| 5515230 | Poly-phase coaxial power line efficiency enhancements Apparatus and method are supplied for an electrical power substation used to interconnect an input three-phase power line to one or more poly-phase output distribution power lines. The teaching of the subject application shows that parasitic losses in pri... | 05/07/1996 |
| 5391929 | Electric power transmission system and method of asymmetric transmission of power to mitigate magnetic fields The method of power transmission and distribution aims to mitigate the magnetic fields generated at a right of way and at distances which extend beyond the right of way. The transmission and distribution lines use various line parameters including the rel... | 02/21/1995 |
| 5384429 | Low impedance surge protective device cables for power line usage A coaxial cable (10) is for use in a power distribution network (N). The cable connects a surge protective device (SPD) in parallel with feeder lines (W1, W2) of the network. The SPD senses voltage surges on the feeder lines and clamps the voltages to a l... | 01/24/1995 |
| 5374853 | Transient damping thyristor controlled series capacitor system A thyristor controlled series capacitor (TCSC) system, including a method and apparatus, uses phase controlled firing based on monitored capacitor voltage and line current. For vernier operation, the TCSC system predicts an upcoming firing angle for switc... | 12/20/1994 |
| 5360998 | Magnetic field minimization in power transmission A series-capacitance compensated shielding circuit is located physically adjacent and parallel to a polyphase power transmission line for the purpose of partially cancelling the electromagnetic fields created by current flow through the transmission line.... | 11/01/1994 |
| 5255150 | Grounding device for power lines A grounding device is automatically operable to create a short circuit in the event of a mechanical fault on a pole line. The grounding device is placed below, and close to, each phase line on a pole line. When the phase line moves down, because of a brok... | 10/19/1993 |
| 5218507 | Overhead three-phase power line eliminating fringing electric and magnetic fields Extraneous electric and magnetic fields, which may be public health risks associated with electric power transmission, are avoided by using an improved power transmission cable and wiring arrangement that uses coaxial transmission lines configured so that... | 06/08/1993 |
| 5216569 | Method and means for suppressing cable line transients An electrical grounding suppressor device, and the method of using the same, which is placed directly in line with the co-axial center conductor of cable television distribution lines without inhibiting or causing significant loss of the radio frequency s... | 06/01/1993 |
| 5202812 | Apparatus for detecting faults on power transmission lines In a system for transmitting an electrical power supply by means of an over-head power transmission line supported by power transmission towers, a fault such as a short-circuit fault and a ground fault is detected by providing optical current sensors havi... | 04/13/1993 |
| 5202583 | Thyristor controlled series capacitor vernier control system A firing control scheme, including a method and apparatus, for secure vernier operation of a thyristor controlled series capacitor (TCSC) in series with a transmission line uses phase controlled firing based on monitored capacitor voltage and line current... | 04/13/1993 |
| 4893211 | Method and circuit for providing adjustable control of short circuit current through a semiconductor device A method for limiting short circuit current flow in a Field Effect Transistor (FET) to limit the power dissipated therein includes sensing a rise in the drain-to-source voltage of the transistor and clamping the gate-to-source voltage to a predetermined a... | 01/09/1990 |
| 4843513 | Method and arrangement for protecting turbine generators against subsynchronous resonances occurring in power transmission systems A method by which a turbine generator (1, 2, 3) can be protected against sub-synchronous frequencies occurring in an electric network which is connected to the turbine generator and which incorporates capacitors. The method is based on de-equalizing the s... | 06/27/1989 |
| 4821138 | Monitoring device for overhead power transmission system In a overhead power transmission system, a sensing member for detecting condition of the overhead power transmission or distribution lines or the ground wire is secured to an anchor and clamp member for anchoring and clamping the power line or overhead gr... | 04/11/1989 |
| 4751614 | Cable having a protecting multi-layer sheath In order to protect a cable, which can be laid in the soil and the conductors of which are electrically conductively connected with a plurality of electrical circuit units, which are arranged distributed at spacings along the cable in the interior of the ... | 06/14/1988 |
| 4747008 | Broken conductor guard system for power distribution systems A broken conductor guard system for a single neutral power distribution system in which at least one high voltage power conductor is suspended between power poles with a neutral conductor being similarly suspended between the poles vertically below the hi... | 05/24/1988 |
