Multifunction protective relay system
First Claim
1. A protective relay system for selectively providing multiple protective relaying functions for electrical power generation apparatus connectable to a three-phase alternating current electrical utility system and to the connections of said power generation apparatus and said utility system, said protective relay system having input means for receiving voltages and currents from said electrical utility system, said protective from said electrical utility system, said protective relay system comprising in combination,digital signal processing means having digital signal processor means, and a microprocessor means,means for coupling said voltages and currents of said utility system as separate analog signals to said relay system,analog-to-digital converter means for receiving and converting said analog values to digital data and coupling said data to said digital signal processor means,said digital signal processor means including means for executing various signal processing algorithms to estimate signal parameters to generate control data and commands,dual-ported memory means providing access to a same memory means location simultaneously by said digital signal processor means and said microprocessor means, said dual ported memory means being operatively coupled to said digital signal processor means and to said microprocessor means for providing a fast bi-directional and independent communications link between said memory means and each of said digital signal processor means and said microprocessor means whereby,said microprocessor means initializes said parameters to control input and output functions of said relay system, andsaid digital signal processor means and said microprocessor means provide a dual processing architecture wherein said digital signal processor means has the function of executing signal processing algorithms and said microprocessor means has the function of providing input and output control data communications to effect high-speed protective relaying.
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Accused Products
Abstract
A protective relay system for generation apparatus connectable to a three-phase alternating current electrical utility system. The relay system includes a dual processing architecture wherein a digital signal processor executes all the signal-processing algorithms, and a separate microprocessor is used for input/output data processing. A dual-ported RAM is used to effect a fast communication link between the digital signal processor and the microprocessor to accomplish high-speed protective relaying functions to selectively trip and close a circuit breaker at a generator or cogenerator site, or that which connects it to an electric utility system.
144 Citations
33 Claims
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1. A protective relay system for selectively providing multiple protective relaying functions for electrical power generation apparatus connectable to a three-phase alternating current electrical utility system and to the connections of said power generation apparatus and said utility system, said protective relay system having input means for receiving voltages and currents from said electrical utility system, said protective from said electrical utility system, said protective relay system comprising in combination,
digital signal processing means having digital signal processor means, and a microprocessor means, means for coupling said voltages and currents of said utility system as separate analog signals to said relay system, analog-to-digital converter means for receiving and converting said analog values to digital data and coupling said data to said digital signal processor means, said digital signal processor means including means for executing various signal processing algorithms to estimate signal parameters to generate control data and commands, dual-ported memory means providing access to a same memory means location simultaneously by said digital signal processor means and said microprocessor means, said dual ported memory means being operatively coupled to said digital signal processor means and to said microprocessor means for providing a fast bi-directional and independent communications link between said memory means and each of said digital signal processor means and said microprocessor means whereby, said microprocessor means initializes said parameters to control input and output functions of said relay system, and said digital signal processor means and said microprocessor means provide a dual processing architecture wherein said digital signal processor means has the function of executing signal processing algorithms and said microprocessor means has the function of providing input and output control data communications to effect high-speed protective relaying.
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14. A protective relay system for selectively providing multiple protective relaying functions for electrical power generation apparatus connectable to a three-phase alternating current electrical utility system and to the intertie connection of said power generation apparatus and said utility system, said relay system having input means for receiving voltages and currents from said utility system, said protective relay system comprising, in combination, digital signal processing means having a digital signal processor means, and a microprocessor means,
said digital signal processing means being coupled to receive and operate on digitized values representative of sinusoidal voltage and current signals from said utility system, means for coupling said voltages and currents of said utility system as at least eight separate analog signal inputs to said relay system, analog filter means for receiving said separate analog signal inputs and removing noise and higher order harmonics of the fundamental frequency of the input voltage and current signals, means for coupling three additional current input channels from said utility system, the current in said three additional current input channels being passed through at least twice to provide relatively higher gain in order to accurately measure low level current signals such as for reverse power, negative sequence over-current relay elements, multiplexer means for receiving said voltage and current signal inputs as at least eleven discrete inputs, said multiplexer means processing said signal inputs in timed sequence and providing analog values representative of said voltage and current signals, programmable gain amplifier means for receiving said analog values from said multiplexer and optimizing the gain scaling of the voltage signals, and the phase and neutral current signals, analog-to-digital converter means for receiving the signals from said programmable gain amplifier and converting said analog values to digital data and coupling said digital data to said digital signal processor means, said digital signal processor means including means for executing various signal processing algorithms to estimate signal parameters, dual-ported memory means for providing access to a same memory means location simultaneously by said digital signal processor means and said microprocessor means, said dual ported memory means being operatively coupled to said digital signal processor means and to said microprocessor means for providing a fast bi-directional and independent communications link between said memory means and each of said digital signal processor means and said microprocessor means, and said microprocessor means utilizing said signal parameters to control input and output functions of said relay system, whereby said digital signal processor means and said microprocessor means provide a dual processing architecture wherein said digital signal processor means executes signal processing algorithms, and said microprocessor means provides input and output data control and communication to effect high-speed protective relaying, such as relay tripping and relay closure, for said generation apparatus.
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30. A protective relay system for selectively providing, multiple protective relaying functions for electrical power generation apparatus connectable to a three-phase alternating current electrical utility system and to the intertie connections of said power generation apparatus and said utility system, said protective relay system having input means for receiving voltages and currents from said electrical utility system, said protective relay system comprising, in combination,
digital signal processing means having a digital signal processor means, and a microprocessor means, said digital signal processing means being coupled to receive and operate on digitized values representative of voltage and current signals from said utility system, means for coupling said voltages and currents of said utility system as separate analog input signals to said relay system, multiplexer means for receiving said separate current and voltage analog input signals, time-sharing said signals, and providing analog values representative of said signals, analog-to-digital converter means including a single sample-and-hold-circuit for receiving and converting said analog values to digital data and for correcting for time skew between channels of said multiplexer means, said digital signal processor means receiving said digital signal values from said analog-to-digital converter and executing multiple signal processing algorithms to estimate parameters representative of said input signal to generate control data and commands, said microprocessor means utilizing said input signal parameters to control input and output functions of said protective relay system including the functions of relay tripping, man-machine interface, and serial communication, dual ported random access memory means for selectively receiving and storing data from said digital signal processor means and from said microprocessor means and enabling bi-directional communication therebetween, said memory means providing a high-speed communications link between said digital signal processor means and said microprocessor means, whereby said digital signal processor means and said microprocessor means provide a dual processing architecture wherein said digital signal processor means execute signal processing algorithms and said microprocessor means provides input and output data control and communications for said relay system to effect high-speed protective relaying such as relay tripping and relay closure for said electrical power generation apparatus.
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31. In a protective relay system, a method for providing multiple protective relaying functions for generation apparatus connectable to a three-phase alternating current electrical utility system, said protective relay system having input means for receiving voltage and currents from, said protective relay system comprising, in combination, digital signal processing means having a digital signal processor means, and a microprocessor means, said method consisting of the steps of:
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coupling said voltages and currents of said utility system as separate analog signals to said relay system, receiving and converting said analog values to digital data and coupling said data to said digital signal processor means, executing multiple signal processing algorithms to estimate signal parameters to generate control data and commands, providing access to a dual-ported memory means simultaneously by said digital signal processor means and said microprocessor means, operatively coupling said dual-ported memory means to said digital signal processor means and said microprocessor means, providing a fast bi-directional and independent communications link between said memory means and each of said digital signal processor means and said microprocessor means, initializing said parameters to control input and output functions of said protective relay system, and thereby providing a dual processing architecture wherein said digital signal processor means has the function of executing signal processing algorithms and said microprocessor means has the function of providing input and output control data communications to effect high-speed protective relaying. - View Dependent Claims (32, 33)
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Specification