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6873159 |
Device and method for monitoring a capacitor bushing
The invention relates to a method for monitoring a capacitor bushing ( 1 ) to which an electrical operating voltage (UB) is applied and in which a voltage divider is formed with an electrically...
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6704568 |
Protection system for an electricity network having an infrared data transmission link using the WAP protocol
The digital protection system for a high voltage electricity network to instruct circuit breakers to open in the event of faults being detected by current and/or voltage sensors on the network...
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6661235 |
Method and device for detecting a partial discharge in an electrical device
The present invention provides a method and device for detecting a discharge in an electrical device comprising, providing a bushing having a bottom lower flange and a top upper flange, providing a...
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6504382 |
Electrical system with a stress shield system for partial discharge on-line monitoring of the state of high-voltage insulation
An electrical system and a sensor for on-line monitoring of the state of high-voltage insulation in the electrical system. In this arrangement, the signals associated with partial discharge...
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6433557 |
Electrical system with capacitance tap and sensor for on-line monitoring the state of high-voltage insulation and remote monitoring device
A sensor and associated circuits are provided for on-line monitoring of the state of the high-voltage insulation in electrical equipment with capacitance tap. In this arrangement, both the power...
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6424162 |
Insulated device diagnosing system that prepares detection data from partial discharge signal such that periodic elements are given to different specific frequencies of the partial discharge signal
An insulated device diagnosing system is capable of judging the deterioration, lifetime, and defects of a device. The intensity at each voltage phase angle is measured at a plurality of specific...
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6259243 |
Method for electromagnetically shielding inductive voltage detectors
The method of this invention provides a means for altering commonly available inductive voltage detector instruments into dual sensitivity test instruments. By shielding the sensor probe with a...
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6236217 |
Cable fault monitoring system
A method of detecting faults on a cable (1) is provided, such a cable (1) having a conductive path, there being a number of sensors (5a, 5b, 5c, 5d, 5e) along the length of the cable (1), each of...
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6177803 |
Monitoring elements in a multi-phase alternating current network
A group of bushings receives voltage in parallel to produce a current output from each bushing. Cumulatively combining the current outputs from the bushings vectorially furnishes a vector sum...
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6130540 |
Measurement system for electric disturbances in a high-voltage switchboard plant
In a measurement system for electric disturbances in a metalen-capsulated high-voltage switchgear having at least one measurement probe for each phase for decoupling of electromagnetic interference...
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6011400 |
Bushing for an electrical high-frequency signal and a measuring instrument containing same
A bushing for an electrical high-frequency signal, with at least one conductive element carrying the electrical high-frequency signal, with at least one mechanical supporting element and with at...
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5764065 |
Remote contamination sensing device for determining contamination on insulation of power lines and substations
A remote contamination sensing device for contamination on insulation of electric power lines and substations includes a data logger and a supporting structure to which a sensing capacitor with at...
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5594349 |
Dielecrtric breakdown prediction apparatus and method, and dielectric breakdown life-time prediction apparatus and method
An accurate dielectric breakdown prediction method and a prediction method in which accurate time dependent dielectric breakdown (TDDB) characteristics can be obtained on the basis of dielectric...
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5530366 |
Acoustic optical system for partial discharge detection and location
An apparatus for detecting a partial discharge in a high voltage transformer comprising a live tank comprises a metal box detachably connected to the tank; a first acoustic sensor inside the box...
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5416420 |
Method and apparatus for the verification of an electrical insulator device based on the analysis of the electric field along the insulator
A method and apparatus for verifying the condition of an electrical insulator which is placed between two live conducting elements which are separated by the insulator. The insulator has a...
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5386192 |
Apparatus for checking the contamination condition of electric insulators
The apparatus comprises a probe-insulator (3) with an internal cavity, a first system (8/1) that circulates a cold fluid within the cavity (4) of the probe-insulator in order to cool the latter to...
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5373242 |
Device for detecting and for indicating fault current through a lightning arrestor or an insulator
A device for detecting and indicating a fault current flowing through a lightning arrestor or an insulator, the current being DC or at AC mains frequency, the device being housed inside a box that...
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5272442 |
Electrical feed-through bushing cavity insulation detector
Apparatus for detecting the sufficiency and quality of an amount of dielectric material contained in the cavity of a transformer bushing is disclosed. The apparatus comprises a collar assembly...
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5140270 |
Electrical feed-through bushing cavity insulation detector
Apparatus for detecting the sufficiency and quality of an amount of dielectric material contained in the cavity of a transformer bushing is disclosed. The apparatus comprises a collar assembly...
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4871972 |
Apparatus for detecting faulty power line insulator
An apparatus for detecting faulty power line insulators of the suspension type on an energized power line by comparing two adjacently mounted insulators in series. The apparatus is generally made...
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4791375 |
Apparatus for detecting degradation of an arrester
An apparatus for detecting degradation of a grounded arrester, including a wave conversion circuit for producing an output signal corresponding to the total leakage current flowing through the...
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4788622 |
Device for indicating the short-circuiting of a lightning arrester
In order visually to indicate the existence of a "continuation" current through a lightning arrester, an indicator is associated therewith, which is formed by an elastically deformable strip...
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4760343 |
Apparatus for detecting defective insulators in an insulating column supporting an electrical conductor in a power circuit line
A method and apparatus for detecting defective insulators in an insulating column supporting an electrical conductor in a power line. The column is made of a plurality of serially connected...
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4758792 |
Method for utilizing a spherical dipole probe for detecting faults in high voltage transmission line insulators
A method is provided for utilizing a nonintrusive, noncontacting electric field sensing device to detect faults in high voltage transmission line insulators. The electric field surrounding an...
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4757263 |
Insulation power factor alarm monitor
The present invention teaches a technique and provides for apparatus eminently useful for the continuous, simultaneous monitoring of the insulation quality of one or more pieces of high voltage ac...
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4577148 |
Surge arrester equipped for monitoring functions and method of use
A metal oxide type surge arrester is provided with a plurality of arrester blocks in series within a housing having, in addition to line and ground terminals at the extremities, a bushing providing...
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4543523 |
Test terminal for use in an electric power transmission system
A test terminal for a lightning arrestor in an electric power transmission system is formed of a unitary generally cylindrical ceramic element having metallic end caps secured thereto. A bar-shaped...
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4266184 |
Method and apparatus for testing insulators
A method and apparatus are described for detecting faulty insulators used on overhead power transmission lines. The apparatus comprises two contact probes, a capacitance, a blocking resistance and...
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4249126 |
On-line fault locator for gas-insulated conductors with plural detectors
Current sensing coils are fixed to the grounded sheath of a gas-insulated conductor in pairs which preferably straddle the internal location of a support insulator. A plurality of such sensors may...
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4237415 |
Method and apparatus for measuring conductivity in electrical feedthrough
Feedthrough bushings containing electrically conductive coatings on the porcelain outer shell are provided with means for electrically monitoring the state of conductivity of the coatings. An...
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3882378 |
Leakage surge indicator
An indicator to indicate or count or record the leakage surge across an insulator of a high voltage transmission line.
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3727129 |
LOGARITHMIC-RESPONSE CORONA DETECTOR
Apparatus for detecting and measuring corona discharges. A sensing circuit is connected to the apparatus, material or sample which is being tested. The output of the sensing circuit is connected to...
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3710242 |
SERVICE BUSHING TEST
Apparatus for measuring a defect characteristic of a bushing which has a high voltage electrode passing through a grounded flange, insulating material around the electrode and a capacitance tap,...
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3707674 |
METHOD AND APPARATUS FOR MEASURING CORONA INCEPTION VOLTAGE ON OVERHEAD CONDUCTORS AND THE LIKE
With this invention, corona inception voltage in uninsulated overhead lines is detected by placing a sensitive direct current galvanometer in position to detect the change from negative to positive...
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3469188 |
COMBINATION DISCHARGE COUNTER AND GRADING CURRENT MEASURING MEANS FOR A LIGHTNING ARRESTER
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3443223 |
LIGHTNING ARRESTER LEAKAGE CURRENT AND DUTY MONITORING SYSTEM
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3439265 |
APPARATUS FOR SUPPRESSING INTERFERENCE CURRENTS IN A MEASURING CIRCUIT BY BYPASSING THE INTERFERENCE CURRENTS AROUND A BRANCH OF THE MEASURING CIRCUIT THROUGH THE SUPPRESSING MEANS
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3363172 |
Insulating bushing test apparatus including an insulated test terminal having a guard electrode
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3189818 |
Portable insulation testing equipment adaptable for conversion from straight to inverted schering-bridge operation
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3156866 |
Method and means for indicating the mode of failure of insulators
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3090912 |
Insulator tester
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2889395 |
Bushing for electrical apparatus
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2802176 |
Bushing for electrical apparatus
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0929773 |
Title is not available
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