Feeder Protection Relayp

Strongly supporting power distribution automation by MELPRO-D series.

The MELPRO-D series are compact multi type relays which contain the necessary elements for the protection of extra high voltage/high voltage power distribution network facilities and devices such as transformers, motors etc. The MELPRO-D series can be connected to a supervisory monitoring system through the application of the communication function (IEC 61850, Modbus).

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Feeder Protection Relay
Motor Protection Relay
Biased Differential Relay for Transformer Protection

Feeder Protection Relay

This products are able to widely applied for Feeder Protection. Main feature are shown as below. ・Phase and earth (ground) overcurrent (50, 51, 50G, 51G) ・Directional earth (ground) overcurrent (67G) ・The 2nd harmonic function to block mal-operation by inrush current of transformers. ・Overvoltage, undervoltage (59, 27) ・Negative-sequence overcurrent and negative-sequence overvoltage element to detect phase unbalance (46, 47) ・Undercurrent element (37) ・Breaker failure protection (50BF)

Product Features

Motor Protection Relay

This products are able to widely applied for Motor Protection. Main feature are shown as below. ・Phase and earth (ground) overcurrent (50, 51, 50G, 51G) ・Directional earth (ground) overcurrent (67G) ・Overvoltage, undervoltage (59, 27) ・Negative-sequence overcurrent and negative-sequence overvoltage element to detect phase unbalance (46, 47) ・Unbalance detection by single phase open ・Counter for number of motor starting up or acceleration (66) ・Thermal overload (49) ・Undercurrent element (37) ・Breaker failure protection (50BF) ・Motor run time monitoring

Product Features

Biased Differential Relay for Transformer Protection

This products are able to widely applied for Transformer Protection. Main feature are shown as below. ・Biased current differential (87T) ・The 2nd harmonic function to block mal-operation by inrush current and the 5th harmonic function to block mal-operation by over-exitation current of transformers. ・Differential overcurrent (87TH) ・Phase and earth (ground) overcurrent for high voltage side and low voltage side (50, 51, 50G, 51G) ・Current differential protection for restricted earth fault (87TN) ・Breaker failure protection (50BF)

Product Features

FA Products

Industrial Computer MELIPC: Industrial Computer MELIPC; Edge Computing Software

Controllers: Programmable Controllers MELSEC; Simple Application Controllers; Motion Controllers; Computerized Numerical Controllers(CNCs); Data logging analyzer-MELQIC

FA Sensor: FA Sensor MELSENSOR

Drive Products: AC Servos-MELSERVO; Inverters-FREQROL; Geared Motors

Visualization: Human-Machine Interfaces(HMIs)-GOT; SCADA

Robots: Vertical type robot; Horizontal type robot; MELFA Smart Plus; Collaborative Robot-ASSISTA; Environment-resistant specifications type robot; Micro working robot; Intelligent Options; FA Application Package iQ Monozukuri

Low-voltage Power Distribution Products: Low-voltage Circuit Breakers; Contactors and Motor Starters

Power Monitoring Products: Power Management Meters; Energy Saving Supporting Devices

Medium-voltage Power Distribution Products: Protection Relays - MELPRO-D Series; Protection Relays - MELPRO-A Series; Protection Relays - MELPRO-S Series; Peripheral Equipment

Processing Machines: Laser Processing Machines; Electrical Discharge Machines; Electron Beam Machines

Sewing Machines: Electronically Controlled Pattern Sewing Machines; Lock-stitch Machine; Motor; Option