Detection of electrical arcs in photovoltaic equipment
First Claim
1. A method for detecting a series arc in a photovoltaic device, operating in direct current mode, including N (N=1 or N>
- 1) photovoltaic modules, connected to a charging device having a capacitive behavior for the modules, the method comprising;
a) detecting, across n of the N modules (1≦
n≦
N), a time evolution of a voltage;
b) identifying a voltage variation between a first zone of stable voltage and a second zone of stable voltage for a duration of at least 5 μ
s, which immediately follows the voltage variation; and
c) detecting said arc by determining whether the voltage variation is between a value Vmin higher than or equal to 0.2 V and a value Vmax lower than or equal to 20 V, with a rise time of the variation between a duration Tmin higher than or equal to 0.5 us and a duration Tmax lower than or equal to 5 μ
s.
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Accused Products
Abstract
A method for detecting a series arc in a photovoltaic device, operating in direct current mode, including N (N=1 or N>1) photovoltaic modules, connected to a charging device having a capacitive behavior for the modules, the method including: a) detecting, across n of the N modules (1≦n≦N), time evolution of voltage; b) identifying a voltage variation between a first zone of stable voltage and a second zone of stable voltage for a duration of at least 5 μs, which immediately follows the voltage variation; and c) determining whether the voltage variation is between a value Vmin higher than or equal to 0.2 V and a value Vmax lower than or equal to 20 V, with rise time of the variation between a duration Tmin higher than or equal to 0.5 μs and a duration Tmax lower than or equal to 5 μs.
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Citations
20 Claims
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1. A method for detecting a series arc in a photovoltaic device, operating in direct current mode, including N (N=1 or N>
- 1) photovoltaic modules, connected to a charging device having a capacitive behavior for the modules, the method comprising;
a) detecting, across n of the N modules (1≦
n≦
N), a time evolution of a voltage;b) identifying a voltage variation between a first zone of stable voltage and a second zone of stable voltage for a duration of at least 5 μ
s, which immediately follows the voltage variation; andc) detecting said arc by determining whether the voltage variation is between a value Vmin higher than or equal to 0.2 V and a value Vmax lower than or equal to 20 V, with a rise time of the variation between a duration Tmin higher than or equal to 0.5 us and a duration Tmax lower than or equal to 5 μ
s. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- 1) photovoltaic modules, connected to a charging device having a capacitive behavior for the modules, the method comprising;
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10. A device for detecting a series arc in a photovoltaic device, operating in direct current mode, including N (N=1 or N>
- 1) photovoltaic modules, and a device having a capacitive behavior for the modules, the detecting device comprising;
a) a detector which detects, across n of the N modules, a time evolution of a voltage; b) a voltage variation identification circuit which identifies a voltage variation between a first zone of stable voltage and a second zone of stable voltage for a duration of at least 5 μ
s, which immediately follows the voltage variation;c) a voltage comparator circuit which detects said arc by determining whether the voltage variation is between a value Vmin higher than or equal to 0.2 V and a value Vmax lower than or equal to 20 V, with a rise time of the variation between a duration Tmin higher than or equal to 0.5 μ
s and a duration Tmax lower than or equal to 5 μ
s. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- 1) photovoltaic modules, and a device having a capacitive behavior for the modules, the detecting device comprising;
Specification