Matches 1 - 39 out of 39


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US20120162829 STAND-ALONE CIRCUIT BREAKER ASSEMBLY AND ASSOCIATED METHOD OF USE  
A stand-alone circuit breaker assembly that includes a housing having a plurality of openings, a plurality of first bushings mounted through the openings in the housing for receiving electrical...
US20130182355 CONNECTION DEVICE FOR TRANSFORMER SUBSTATION MODULES  
The present invention relates to a transformer substation (6) comprising high-voltage switchgear (1), a low-voltage switchboard (3) and a transformer (2) which are electrically interconnected on...
US20110128656 OUTPUT SHORT CIRCUIT PROTECTION FOR ELECTRONIC TRANSFORMERS  
An overcurrent protection control circuit for an electronic transformer includes a feedback current detection circuit, an averaging circuit and an overcurrent shutdown circuit. The feedback...
US20150124356 Blocker of geomagnetically induced currents (GIC)  
A device for mitigating Geomagnetically Ground Induced Currents (GIC) flowing from the neutral of a star-connected three-phase power transformer to ground without compromising its basic...
US20110090606 Countermeasure for EMP-E3 induced currents  
A countermeasure for mitigating Electromagnetic Pulse E3 (EMP-E3) induced currents flowing through the neutral of a star-connected three-phase power transformer without compromising its neutral...
US20110216450 TRANSFORMER FAILURE ANALYSIS SYSTEM  
A transformer failure analysis system using a programmable chip in conjunction with a shock response spectrum analysis method to distinguish inrush current and fault current of a transformer and...
US20140192443 MAGNETIZING INRUSH CURRENT SUPPRESSION DEVICE  
According to one embodiment, there is provided a magnetizing inrush current suppression device. A closing phase determination unit determines a phase position for suppressing the magnetizing...
US20120008239 TRANSFORMER MODULE WITH MULTIPLE PROTECTIONS  
The transformer module of the invention includes an isolation transformer having a primary winding with a first tap and a secondary winding with a second tap. A protection circuit is electrically...
US20140160820 Electrical Current Transformer for Power Distribution Line Sensors  
An electrical current transformer for installation upon a power distribution line including a generally annular, split core and a secondary winding. The secondary winding includes a first winding...
US20150043108 SYSTEM, APPARATUS, AND METHOD FOR REDUCING INRUSH CURRENT IN A TRANSFORMER  
A system for reducing inrush current in a three phase utility transformer upon energization of the transformer by an applied three phase voltage utilizes a pre-flux circuit for establishing...
US20120050923 METHODOLOGY FOR PROTECTION OF CURRENT TRANSFORMERS FROM OPEN CIRCUIT BURDEN  
A protected electrical power system may comprise a feeder between a power source and an electrical load. A first current transformer may be positioned on the feeder in a first location. The first...
US20120293896 INRUSH-CURRENT SUPPRESSING DEVICE AND INRUSH-CURRENT SUPPRESSING METHOD  
An inrush-current suppressing device includes a residual-magnetic-flux calculation unit that obtains a residual magnetic flux generated within a three-phase transformer, an input...
US20130308229 Self-Testing Features of Sensing and Control Electronics for a Power Grid Protection System  
Systems and method for detecting potentially harmful harmonic and direct current signals at a transformer are disclosed. One system includes a protection circuit electrically connected to a...
US20110062797 PROTECTION SYSTEM FOR VOLTAGE TRANSFORMERS  
The subject of the invention is a protection system for voltage transformers, finding application in the attenuation of ferroresonant states occurring in voltage transformers in high and medium...
US20120236442 INTELLIGENT CONTROLLER  
Described herein is an intelligent controller for management and control of electrical distribution transformer either located within the transformer or outside the transformer, housed in a...
US20060152865 Circuit for protecting a transistor from an open secondary ignition coil  
An electronic circuit for driving a load includes a primary coil coupled to a secondary coil. The secondary coil is coupled to the load. A switching device is electrically connected to the primary...
US20150124357 EXCITATION INRUSH CURRENT SUPPRESSING APPARATUS AND EXCITATION INRUSH CURRENT SUPPRESSING METHOD  
According to one embodiment, an excitation inrush current suppressing apparatus comprising: bus voltage measurement equipment which measures each phase voltage of the single-phase AC-side bus;...
US20130155553 MAGNETIZING INRUSH CURRENT SUPPRESSION APPARATUS  
According to one embodiment, there is provided a magnetizing inrush current suppression apparatus including a transformer-side voltage measuring unit measuring a single-phase voltage, a conversion...
US20100142102 Low Force Low Oil Trip Mechanism  
A circuit breaker for a transformer includes means for interrupting circuitry in the transformer upon a fault condition in the transformer (the “fault interruption means”). The circuit breaker...
US20090091867 Transformer Through-Fault Current Monitor  
A device is provided for monitoring through-fault current in an electric transformer on an electrical power system. The device generally includes a magnitude calculator for calculating the...
US20110181989 TRANSFORMER INRUSH CURRENT SUPPRESSION APPARATUS  
Inrush current suppression apparatus for suppressing a transformer inrush current including a transformer side voltage measurement unit which measures a voltage at a side of a transformer, a...
US20090279216 Adjustable Rating for a Fault Interrupter and Load Break Switch  
A fault interrupter and load break switch includes a trip assembly configured to automatically open a transformer circuit electrically coupled to stationary contacts of the switch upon the...
US20090027815 Protective Device Having a Circuit Breaker, in Particular a Low-Voltage Circuit Breaker  
A protective device is disclosed having a circuit breaker for an electrical connection between a transformer and a load, wherein an overcurrent device is arranged between the transformer and the...
US20130163125 MAGNETIZING INRUSH CURRENT SUPPRESSION APPARATUS  
According to one embodiment, there is provided a magnetizing inrush current suppression apparatus including an interrupting phase detection unit that detects a phase when the transformer that...
US20100085668 PHASE-CONTROL SWITCHING APPARATUS AND SWITCHING CONTROL METHOD FOR PHASE-CONTROL SWITCHING APPARATUS  
A residual-magnetic-flux calculating unit includes a voltage-change-rate detecting unit that detects a transformer-voltage change rate from a phase voltage between a breaker and a transformer, a...
US20090059447 METHOD AND DEVICE FOR FAULT DETECTION IN AN N-WINDING THREE-PHASE POWER TRANSFORMER  
A method and a device for fault detection in an n-winding, three-phase power transformer. For each of the windings (Wi) the three phase currents (IL1—Wi; IL2—Wi; IL3—Wi) are measured. For each of...
US20120026630 Method and Apparatus For Use In Monitoring Operation of Electrical Switchgear  
An instrument transformer includes a current transformer configured to be coupled to a load, and to generate an analog signal that is proportional to a current flowing through the load. The...
US20170170648 PROTECTIVE DEVICE FOR PROTECTING A TRANSFORMER AGAINST GEOMAGNETICALLY INDUCED CURRENTS  
A protective device for a transformer which is connected on the high-voltage side via supply lines to a network for transmission and distribution of electrical energy, wherein the transformer...
US20170005469 SURGE SUPPRESSION SYSTEM FOR MEDIUM AND HIGH VOLTAGE  
A system of surge suppressor units is connected at multiple locations on a power transmission and distribution grid to provide grid level protection against various disturbances before such...
US20160197469 SYSTEMS AND METHODS FOR ACTUATING A TRANSFORMER NEUTRAL BLOCKING SYSTEM  
A control device for an electrical protection circuit for use in an alternating current system including a transformer is disclosed. An example system includes a first measurement probe, a second...
US20160181786 APPARATUS FOR MITIGATION OF ADVERSE EFFECTS OF GEOMAGNETICALLY INDUCED CURRENTS ON TRANSFORMERS  
An apparatus for mitigating GIC (geomagnetically induced current) effects through a fuzzy logic controlled variable resistor. Under GIC conditions (or any unbalanced fault current condition), the...
US20160149396 System For Protection Of Dry Type Transformers  
A system for transient over voltage protection of a three-phase transformer. Two surge arresters are series connected across each winding of the transformer and the center point connection of the...
US20160126738 SURGE SUPPRESSION SYSTEM FOR MEDIUM AND HIGH VOLTAGE  
A system of surge suppressor units is connected at multiple locations on a power transmission and distribution grid to provide grid level protection against various disturbances before such...
US20160126725 ELECTROSTATIC DISCHARGE PROTECTION FOR A TRANSFORMER BALUN  
A balun includes an input coil and an output coil with first and second outputs that vary during normal operation. The output coil has a center point connection that remains substantially constant...
US20150333509 Protective Circuit for a Current Transformer and Current Transformer with a Protection Circuit  
A protective circuit for a current transformer for preventing a secondary voltage on a secondary circuit of the current transformer from exceeding a secondary voltage threshold. A protective...
US20150311697 TRANSFORMER PROTECTION CIRCUIT AND METHOD  
Systems and methods for protecting an electrical component in an alternating current system that includes a transformer are disclosed. In one aspect, a circuit includes a switch assembly connected...
US20150280422 FAULT PROTECTION OF A VOLTAGE DIFFERENTIAL TRANSFORMER (VDT) EXCITATION CIRCUIT  
An excitation circuit includes an operational amplifier, a transistor circuit, a switch, and a pull-down resistor. The operational amplifier receives an excitation input voltage at a non-inverting...
US20150270699 TRANSFORMER PROTECTION SYSTEM  
An exemplary transformer protection system including a protective housing having a transformer which is arranged in the protective housing, a transformer core, and at least one primary-side...
US20130335864 ELECTRONIC IGNITION SYSTEM FOR AN ENGINE OF A VEHICLE IN CASE OF FAILURE  
An electronic system to discharge a transformer in case of a failure during a charging phase of the transformer. The system includes the transformer having a primary winding with a first terminal...

Matches 1 - 39 out of 39