Residual or leakage currents, for which the LDSR model was designed to be measured, can arise when faults occur in industrial or power generation environments. Examples include faults such as short circuits or ground faults. Connecting a solar panel to the electrical grid increases safety concerns; if a fault occurs, there is a serious potential safety problem due to a person coming into contact with the system.
The sensor is mounted on a printed circuit board for the primary and secondary connections and supplies an analog voltage output.
The LDSR provides a large overload capacity of up to 3300A (for a pulse duration of 100µs and a rise time of 500 A/µs), as well as a very high level of isolation between the primary and measuring circuits thanks to its long air distances and creepage and clearance lines of 7.1 mm, along with a comparative tracking index (CTI) of 600 V.
The LDSR, which is based on a closed-loop Hall-effect ASIC, is designed with a single integrated conductor in the primary capable of handling up to 35 A on the phase and neutral, providing excellent common-mode rejection. The proprietary ASIC ensures high accuracy between -40 and +105°C, thus meeting the requirements of the EN 61209 standard.
The LDSR model is powered by +5VDC and its typical current consumption is only 40 mA when measuring 300 mA as nominal residual current on the primary side. It provides access to its internal reference voltage and options such as a test winding and demagnetization functions. The LDSR meets the needs of photovoltaic inverters, offering a competitive price, small size, and compliance with all standards. The LDSR also represents an excellent alternative to expensive magnetic induction-based solutions due to its small size and simple construction.
In addition to ensuring safety in solar inverter installations, LEM's LDSR product is also ideal for a range of applications from detecting symmetry faults in medium-power inverters to detecting faults in various power sources.
These transducers are CE and UL marked and meet industry standards. LEM offers a five-year warranty on each transducer.
