VOLTAGE AND FREQUENCY RELAYS
Voltage and Frequency protection relays
Voltage and frequency protections relay perform voltage monitoring for electrical networks and/or islanding, or load shedding for no priority loads. So when the electrical supply of a switchboard is performed by two transformers feeding each a half-busbar, in case of a transformer failure, it is possible to perform automatic load transfer from a half-busbar to the other.
Zero sequence over voltage relays protect three-phase networks with isolated or high impedance earthed neutral against earth faults.
Below the list of CEE products dedicated to the voltage and frequency monitoring.
|NP V911||NP 900||59, 27, 59N, 59P/27P/47, 78, 81O/81U, 81R, 60, 74TC, 86||Busbar voltage & frequency protection IED|
|NPU800||NP 800||27, 27P, 47, 59, 59N, 74TC, 81, 86||Voltage and Frequency Relay|
|NP 800 R||27, 27P, 47, 59, 59N, 74TC, 81, 86||Voltage and Frequency Relay|
|NPUH800||NP 800||59N, 86, 74TC||Residual Overvoltage Relay (Neutral Displacement Relay)|
|NPUH800R||NP 800 R||59N, 86, 74TC||Residual Overvoltage Relay (Neutral Displacement Relay)|
|TMS 700||PROCOM||27, 59, 59N||Digital multi-function voltage relay|
|TMS 7000||PROCOM||27, 27P, 47, 59, 59N||Digital multi-function voltage relay with advanced functionalities|
|HDG 7020||STATIC||81||Frequency relay|
|TTB 7000||STATIC||27DC, 59DC||Measuring relay for DC applications|
|TTG 7000||STATIC||27, 59, 59N||Undervoltage and overvoltage relays|
|TTGB 7031||STATIC||60||Voltage balance relay|