Schneider Electric to Distribute EOCR to 3 Industries
Strengthen performance and respond to demand in line with KEC standards
EOCR data analysis to support motor predictive maintenance


Electronic Over Current Relay (EOCR) is a device that protects equipment from abnormalities such as motor overcurrent, phase failure, and ground fault.

Schneider Electric announced on the 4th that new EOCR products, 'EOCR-iSEMMETS', 'EOCR PFZ/PMZ', and 'EOCR FMZ2' models with enhanced digital functions and new functions in accordance with the newly revised Korean Electrical Installation Technology Standards (KEC), are now being distributed.

The EOCR-iSEMMETS model is a total solution that protects and monitors motors and equipment with information such as current, voltage, power, and temperature and humidity. It has an analysis function through the Fast Fourier Transform (FFT) of the load current. It analyzes the current frequency spectrum in real time to diagnose the motor aging status and enable predictive maintenance.

When dozens to hundreds of motors on a ship fail, repairs and restorations take a lot of time and cost. To prevent this, it is necessary to continuously monitor the motor condition, predict the time of failure, and manage assets and equipment in optimal condition through preemptive repairs and replacements. Accordingly, Samsung Heavy Industries is providing technology that can detect motor abnormalities in advance based on the EOCR-iSEMMETS model to the ship's important equipment monitoring system.

The EOCR PFZ/PMZ, FMZ2 series can analyze leakage current with total harmonic distortion measurement function and noise reduction performance. The measurement accuracy has been improved by improving the current RMS error to less than 1%, and a temperature and humidity measurement function has also been added.

It identifies the noise status and harmonic current in the field, improves the EOCR current error, and removes capacitive leakage current with the digital low pass filter function to prevent ground fault protection and unnecessary malfunction due to resistive leakage current. To analyze the cause of the accident, the waveform recorded in EOCR and the time of accident occurrence are recorded and analyzed in a dedicated SW.

This function corresponds to Article 67 of the Electricity Business Act and Article 43 of the Enforcement Decree, and Article 4 of the KEC, which revised the standards to allow insulation performance to be verified by resistance components when the insulation function of a low-voltage circuit must be verified by leakage current. Three new product groups that have been improved in accordance with these regulations are actively being applied in power plants, water treatment plants, commercial buildings, steel mills, and chemical plants.