Patents by Inventor Sioe T. Mak
Sioe T. Mak has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7496430Abstract: A quick response system incorporated in a TWACS for mapping an outage in an electrical distribution system without having to continuously poll the electrical meters connected to the system. In a primary embodiment of the invention when a fault is sensed to have occurred, the amplitude of the fault is measured to determine if the fault is a medium voltage fault, or a low voltage fault. The pattern of the fault signature and change in load, both before and after the fault, are examined to determine what protective device was triggered by the fault. Using this information, and knowledge of the number and location of electrical meters connected in the distribution system, a population of meters to be polled is determined. By polling the identified population, a map of the extent of the outage is readily determined, and the time to respond to the fault and restore service is reduced.Type: GrantFiled: March 6, 2007Date of Patent: February 24, 2009Assignee: Distribution Control SystemsInventor: Sioe T. Mak
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Publication number: 20070211401Abstract: A quick response system incorporated in a TWACS for mapping an outage in an electrical distribution system without having to continuously poll the electrical meters connected to the system. In a primary embodiment of the invention when a fault is sensed to have occurred, the amplitude of the fault is measured to determine if the fault is a medium voltage fault, or a low voltage fault. The pattern of the fault signature and change in load, both before and after the fault, are examined to determine what protective device was triggered by the fault. Using this information, and knowledge of the number and location of electrical meters connected in the distribution system, a population of meters to be polled is determined. By polling the identified population, a map of the extent of the outage is readily determined, and the time to respond to the fault and restore service is reduced.Type: ApplicationFiled: March 6, 2007Publication date: September 13, 2007Applicant: DISTRIBUTION CONTROL SYSTEMSInventor: Sioe T. Mak
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Patent number: 5696441Abstract: An interface circuit (10) for use with electronic metering equipment (E) to provide a linear output response to an AC or analog input. An air core transformer (12) has a first coil or winding (12a) connected to a load (L). An AC current I.sub.LOAD is produced by the load and is coupled to a secondary coil or winding (12b) of the transformer. The transformer has an air core rather than a ferromagnetic core so to have no saturable core. Because no load is drawn by transformer coil, the voltage across a terminal of the coil equals the EMF induced in the coil. The EMF, in turn, equals the mutual inductance of the coils multiplied by the rate of change of magnetic flux linkages over time. The output from the transformer is applied as an input to an operational-amplifier (16) which has a high input impedance. Further, the amplifier is a low drift amplifier which performs a linear amplification of the input signal provided thereto.Type: GrantFiled: May 13, 1994Date of Patent: December 9, 1997Assignee: Distribution Control Systems, Inc.Inventors: Sioe T. Mak, Brian C. Ramey
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Method of receiving unsolicited messages on an electrical distribution network communications system
Patent number: 5486805Abstract: A two-way communication system (TWACS) used with an electrical power distribution network N. The TWACS provides both outbound and inbound messages to and from remote network locations. A method of detecting and decoding unsolicited inbound messages from remote locations first involves generating the message in response to a time independent event occurring at the remote location. Formation of the message includes both generating a series of message bits, each of which has a prescribed format, and affixing a preamble to the front end of the message which comprises a plurality of bits arranged in a predetermined pattern. The message is then transmitted over any one of a plurality of communication channels n normal used for two-way communications. Since the event triggering the unsolicited inbound message is independent of time, the time of transmission is random.Type: GrantFiled: July 6, 1993Date of Patent: January 23, 1996Assignee: Distribution Control Systems, Inc.Inventor: Sioe T. Mak -
Patent number: 5262755Abstract: Signals carried inbound on an electricity distribution network are detected by extracting electrical current information from a waveform of the electricity distribution network, and digitally filtering the electrical current information, thereby forming a digital waveform, to extract signal information contained in the electrical current information. A reference waveform is constructed from a portion of the digital waveform, and the signal information is detected by comparing portions of the digital waveform with corresponding portions of the reference waveform.Type: GrantFiled: December 17, 1991Date of Patent: November 16, 1993Assignee: Distribution Control Systems, Inc.Inventors: Sioe T. Mak, Kevin J. Franzen
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Patent number: 4996513Abstract: A communication system uses the current waveform of an electricity distribution network as a carrier, the signal being present as current pulses around four predetermined zero crossings. The current waveform is sampled around the voltage zero crossings to obtain a time-ordered set of waveform values. The ordered waveform values for each bit are examined to determine if the values fall within preset criteria indicative of a stable carrier. When the ordered waveform values for a particular bit all fall within the preset criteria, that particular bit is identified as a good bit. When at least some of the ordered waveform values for a particular bit fall outside the preset criteria, that particular bit is labelled as suspect. The ordered values of each suspect bit and of adjacent bits are tested to determine whether four successive values meets the preset stability criteria, and whether the four successive values indicating a stable carrier include at least two succesive values from the suspect bit.Type: GrantFiled: February 20, 1990Date of Patent: February 26, 1991Assignee: Emerson Electric Co.Inventors: Sioe T. Mak, Richard L. Maginnis, Kevin J. Franzen
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Patent number: 4963853Abstract: A communication system with six simultaneous independent inbound channels is disclosed which uses the voltage waveform of an electricity distribution network as a carrier. The manner in which the inbound channels are identified as well as how various sets of such independent channels can be found is disclosed. Identification of sets or groups of such independent channels involves identifying all potential channels and calculating the detection algorithm for each. Pure pulse patterns for binary "1"s for each channel are then multiplied by the detection algorithms for every channel to generate a matrix whose elements include the application of all the detection algorithms to all the aforementioned pulse patterns. Examination of qualifying elements of the matrix allow the identification of sets of mutually non-interfering channels.Type: GrantFiled: October 16, 1989Date of Patent: October 16, 1990Assignee: Emerson Electric Co.Inventor: Sioe T. Mak
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Patent number: 4918422Abstract: Waveforms are derived from each primary of a multi-phase electric distribution system, which derived waveforms include at least a carrier component. At least some of which derived waveforms include a signal component. The waveform of one of the primaries is adjusted in amplitude and phase so that the carrier components of the derived waveforms substantially cancel when the waveforms are summed together.Type: GrantFiled: April 25, 1988Date of Patent: April 17, 1990Assignee: Emerson Electric Co.Inventor: Sioe T. Mak
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Patent number: 4914418Abstract: Outbound signals carried over an electric power network are detected and crosstalk is rejected by sampling the waveform in three segments of each cycle. In the first segment valid signals are always absent. Valid signals appear at the same time in both the second and third segments. Sample waveform values from alternate half cycles are compared to detect differences indicative of outbound signal information. The energy in each of the three segments is compared with an energy threshold for that segment and a cycle under test is rejected when the energy in the first segment exceeds the threshold for that first segment. A cycle under test is also rejected if the energy in the third segment greatly exceeds the energy in the second segment. Signal detection thresholds for both signal strength and energy in the segments are set recursively using actual samples acquired at the outbound detection site. These thresholds are sensitive to dynamic network changes.Type: GrantFiled: January 3, 1989Date of Patent: April 3, 1990Assignee: Emerson Electric Co.Inventors: Sioe T. Mak, David S. Takach, Ray C. Hatton, Jr.
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Patent number: 4658238Abstract: A method and apparatus for transmitting intelligence over a carrier wave are provided in which a signal wave form is indirectly added to a carrier wave to produce a composite wave having a recognizable pattern of variations in intervals that are defined by preselected locations in the composite wave. The pattern of variations in intervals resulting from the addition of the signal wave form to the carrier wave represents at least a portion of the intelligence to be transmitted over the carrier wave. The variations in intervals defined by the preselected locations in the carrier wave are detected and the detected interval variations are converted into a signal which has a characteristic that is a function of the recognizable pattern of interval variations. In the preferred embodiment, the intelligence is transmitted over an electric power distribution network utilizing the alternating voltage thereon as the carrier wave.Type: GrantFiled: August 24, 1982Date of Patent: April 14, 1987Assignee: Emerson Electric Co.Inventor: Sioe T. Mak
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Patent number: 4212696Abstract: An organic composite electrical insulator system includes one or more modular ethylene propylene copolymer elastomeric molded insulators or sheds bonded by a thin line bond to an epoxy or polyester resin bonded fiberglass structural member. In one embodiment, the organic composite insulator system may take the form of a suspension insulator used to support a high voltage power cable from a transmission tower. The suspension insulator includes a pair of metallic end connectors mechanically attached to opposite longitudinal ends of an elongated polyester resin bonded fiberglass core rod. The space between the end connectors along the rod is filled with a plurality of modular ethylene propylene elastomeric molded insulators or sheds having inner diameters smaller than the outside diameter of the rod in order to obtain a slip fit and thereby compressively load the interface surfaces between the sheds and the rod during the manufacture of the rod.Type: GrantFiled: September 29, 1976Date of Patent: July 15, 1980Assignee: Joslyn Mfg. and Supply Co.Inventors: George E. Lusk, Sioe T. Mak, John C. Haarsma