Large Signal Inductance Measuring Device and Method for Performing a Measuring Process for Measuring an Inductance

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This patent discloses a device and method for accurately measuring the inductance of direct current (DC) power supply lines, particularly under large-signal (high-current) conditions. The invention separates the energy supply line into source-side and load-side regions and employs a combination of disconnect switches, capacitors, diodes, and measurement modules to capture voltage and current values linked to the inductive components of both sides. By disconnecting the line and analyzing resulting voltage changes, the system can accurately determine the inductance at each section, thereby aiding in the design and protection of DC circuit breakers and power network components.

Use CasesContent extracted from patent full text and abstract with AI.

• Design and testing of electronic, mechanical, or hybrid DC circuit breakers for industrial DC networks, electric vehicle (EV) networks, and photovoltaic (PV) installations.
• Measuring the inductance at different points in DC grids for improved grid analysis and maintenance.
• Verification and compliance testing of DC charging stations, specifically assessing output inductance as required by standards.
• Evaluating and optimizing overload protection strategies on both the energy source and load sides of a DC network.
• Implementation in service tools for power utilities, grid operators, or renewable energy installations for commission and diagnostic measurements.

BenefitsContent extracted from patent full text and abstract with AI.

• Enables accurate large-signal inductance measurement in DC systems, crucial for safe and reliable DC circuit breaker design.
• Provides distinction between source-side and load-side inductances, allowing targeted and optimized overload protection on both ends.
• Offers rapid and precise measurements without significantly interrupting network operation.
• Adaptable for a wide range of applications, including industrial, EV, and renewable energy settings.
• Helps prevent destructive switching transients or failures in DC systems by allowing tailored protection schemes based on real-world inductance data.

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Inventors & Applicants

Patent Abstract

The invention relates to a large signal inductance measurement device (1) and to a method for carrying out a measurement operation to measure an inductance (QTI, LTI) on an electrical energy supply line arrangement (EL, ZL) operated with a DC voltage, the large signal inductance measurement device (1) comprising: a disconnector (2) for electrically disconnecting the first conductor (EL) of the energy supply line arrangement (1); a first series circuit (3, 4) comprising a first capacitive arrangement (3) and a first diode arrangement (4); a first measurement device (5) for measuring a first voltage change following the disconnection of the first conductor (EL); a second series circuit (6, 7) comprising a second capacitive arrangement (6) and a second diode arrangement (7); a second measurement device (8) for measuring a second voltage change following the disconnection of the first conductor (EL); a third measurement device (9) for measuring a third current over the first conductor (EL) prior to the disconnection of the first conductor; and an evaluation device (10) for evaluating the measured first voltage change, the measured second voltage change, and the measured third current.