Method and apparatus for testing the operating conditions of an electric network
First Claim
1. A method for testing operating conditions of an electric network, the operating conditions including an operating state, the electric network having a load, the method comprising:
- providing a voltage signal to the load and measuring an instantaneous current signal circulating in the load,generating a delayed instantaneous current signal delayed by an amount of time by delaying the instantaneous current signal with respect to the voltage signal by the amount of time, the amount of time selected as a function of the operating state of said load,calculating, within a measurement time, an admittance ratio between a mean of a product of the voltage signal and the delayed instantaneous current signal, and a mean of the square of the voltage signal,comparing a value of the admittance ratio with a range of admittance values and generating an output signal; and
detecting open-circuit and short-circuit operating states of the electric network based on the output signal.
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Accused Products
Abstract
A method for testing the operating conditions of an electric network, including at least one operating state, including the steps of providing a voltage signal (v(t)) to a network load and measuring the instantaneous current signal (i(t)) circulating in the load, delaying the instantaneous current signal (i(t)) to generate an instantaneous current signal delayed ((i(t+τ)) by a predetermined amount of time (τ), the predetermined amount of time (τ) being a function of the operating state of said load, the method including the steps of calculating, within a predetermined measurement time (Tm), an admittance ratio (Gχ(τ)) between the mean of the product of the voltage signal (v(t)) and the delayed instantaneous current signal (i(t+τ)), and the mean of the square of the voltage signal (v(t)), and to compare the value of the admittance ratio (Gχ(τ)) with a range of predetermined values (Gmin,Gmax) to determine the operating state of the electric network.
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Citations
31 Claims
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1. A method for testing operating conditions of an electric network, the operating conditions including an operating state, the electric network having a load, the method comprising:
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providing a voltage signal to the load and measuring an instantaneous current signal circulating in the load, generating a delayed instantaneous current signal delayed by an amount of time by delaying the instantaneous current signal with respect to the voltage signal by the amount of time, the amount of time selected as a function of the operating state of said load, calculating, within a measurement time, an admittance ratio between a mean of a product of the voltage signal and the delayed instantaneous current signal, and a mean of the square of the voltage signal, comparing a value of the admittance ratio with a range of admittance values and generating an output signal; and detecting open-circuit and short-circuit operating states of the electric network based on the output signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for testing operating conditions of an electric network, the operating conditions having an operating state, the electric network including a load, the method comprising:
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providing an instantaneous current signal (i(t)) to the load and measuring a voltage signal of the load, generating a delayed voltage that is delayed with respect to the instantaneous current signal by delaying the voltage signal by an amount of time, the amount of time selected as a function of the operating state of the load from one of a first time to detect a short circuit and a second time to detect an open circuit, calculating, within a measurement time, an impedance ratio value between a mean of a product of the delayed voltage signal and the instantaneous current signal, and a mean of a square of the instantaneous current signal, comparing the impedance ratio value with a range of impedance ratio values, and detecting open-circuit and short-circuit operating states of the electric network using the comparison to. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A device for testing operating conditions of an electric network having a load, the conditions including an operating state, the device comprising:
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a circuit structured to generate a voltage signal to be provided to the load and to measure an instantaneous current signal circulating in the load; a selector structured to select an amount of time as a function of the operating state to be tested in the load, a circuit structured to generate a delayed instantaneous current signal delayed with respect to the voltage signal by the amount of time that is selected as a function of the operating state of the load; a processor structured to operate within a measurement time and configured to calculate an admittance ratio between a mean of a product of the voltage signal and the delayed instantaneous current signal, and a mean of a square of the voltage signal; and a comparator structured to compare a value of the admittance ratio with a range of admittance values and to generate an output signal to the processor that is structured to detect open-circuit and short-circuit operating states of the electric network. - View Dependent Claims (23)
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24. A device for testing operating conditions of an electric network, including an operating state, the electric network having a load, the device comprising:
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a circuit structured to generate an instantaneous current signal to be provided to the load and measuring a voltage signal at the ends of the load; a selector structured to select the operating state of the load; a generator structured to generate a delayed voltage signal that is delayed with respect to the instantaneous current signal by an amount of time that is selected as a function of the operating state of the load; a processor structured to calculate, within a measurement time, an impedance ratio between a mean of a product of the delayed voltage signal and the instantaneous current signal, and a mean of a square of the instantaneous current signal; and a comparator structured to compare a value of the impedance ratio with a range of impedance values and to generate an output signal to the processor, the processor further structured to detect open-circuit and short-circuit operating states of the electric network. - View Dependent Claims (25)
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26. A method, comprising:
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providing a voltage signal to an electric network having an operating state, the electric network including a load; measuring a resulting instantaneous current signal circulating in the load; generating a delayed instantaneous current signal that is delayed with respect to the voltage signal by an amount of time selected as a function of an operating state of the load; calculating within a measurement time an admittance ratio; and comparing a value of the admittance ratio with a range of admittance values to detect open-circuit and short-circuit operating states of the electric network. - View Dependent Claims (27, 28)
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29. A circuit for testing operating conditions of an electric network having an operating state and coupled to a load, the circuit comprising:
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a first circuit adapted to generate a voltage signal to be provided to the load and to measure an instantaneous current signal circulating in the load as a result of the generating of the voltage signal; a selector circuit adapted to select an amount of time; a second circuit adapted to generate a delayed instantaneous current signal that is delayed with respect to the voltage signal by the amount of time selected by the selector; a processor operating within a measurement time and adapted to process an admittance ratio within a measurement time; and a comparator adapted to compare the value of the admittance ratio with a range of values and generating an output signal to the processor that is further structured to detect open-circuit and short-circuit operating states of the electric network. - View Dependent Claims (30, 31)
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Specification