Products
Protection Relays - MELPRO-D Series
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).
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)
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
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)
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