Line differential protection RED670 1MRK505228-BEN E-Directional over/underpower protection GOPPDOP/GUPPDUP

Date: May 05, 2026 Views: 4579

　　The directional over-/under-power protection GOPPDOP/ GUPPDUP can be used wherever a high/low active, reactive or apparent power protection or alarming is required. The functions can alternatively be used to check the direction of active or reactive power flow in the power system. There are a number of applications where such functionality is needed. Some of them are:

　　• detection of reversed active power flow

　　• detection of high reactive power flow

　　Each function has two steps with definite time delay. Reset times for both steps can be set as well.

　　Broken conductor check BRCPTOC

　　The main purpose of the function Broken conductor check (BRCPTOC) is the detection of broken conductors on protected power lines and cables (series faults). Detection can be used to give alarm only or trip the line breaker.

　　Voltage protection

　　Two step undervoltage protection UV2PTUV

　　Undervoltages can occur in the power system during faults or abnormal conditions. Two step undervoltage protection (UV2PTUV) function can be used to open circuit breakers to prepare for system restoration at power outages or as longtime delayed back-up to primary protection.

　　UV2PTUV has two voltage steps, each with inverse or definite time delay.

　　Two step overvoltage protection OV2PTOV

　　Overvoltages may occur in the power system during abnormal conditions such as sudden power loss, tap changer regulating failures, open line ends on long lines etc.

　　Two step overvoltage protection (OV2PTOV) function can be used to detect open line ends, normally then combined with a directional reactive over-power function to supervise the system voltage. When triggered, the function will cause an alarm, switch in reactors, or switch out capacitor banks.

　　OV2PTOV has two voltage steps, each of them with inverse or definite time delayed.

　　OV2PTOV has an extremely high reset ratio to allow settings close to system service voltage.

　　Two step residual overvoltage protection ROV2PTOV

　　Residual voltages may occur in the power system during earth faults.

　　Two step residual overvoltage protection ROV2PTOV function calculates the residual voltage from the three-phase voltage input transformers or measures it from a single voltage input transformer fed from an open delta or neutral point voltage transformer.

　　ROV2PTOV has two voltage steps, each with inverse or definite time delay.

　　Reset delay ensures operation for intermittent earth faults.

　　Overexcitation protection OEXPVPH

　　When the laminated core of a power transformer or generator is subjected to a magnetic flux density beyond its design limits, stray flux will flow into non-laminated components not designed to carry flux and cause eddy currents to flow. The eddy currents can cause excessive heating and severe damage to insulation and adjacent parts in a relatively short time. The function has settable inverse operating curves and independent alarm stages.

　　Voltage differential protection VDCPTOV

　　A voltage differential monitoring function is available. It compares the voltages from two three phase sets of voltage transformers and has one sensitive alarm step and one trip step.

　　Loss of voltage check LOVPTUV

　　Loss of voltage check (LOVPTUV) is suitable for use in networks with an automatic system restoration function. LOVPTUV issues a three-pole trip command to the circuit breaker, if all three phase voltages fall below the set value for a time longer than the set time and the circuit breaker remains closed.

　　Frequency protection

　　Underfrequency protection SAPTUF

　　Underfrequency occurs as a result of a lack of generation in the network.

　　Underfrequency protection SAPTUF is used for load shedding systems, remedial action schemes, gas turbine startup and so on.

　　SAPTUF is also provided with undervoltage blocking.

　　The operation is based on positive sequence voltage measurement and requires two phase-phase or three phaseneutral voltages to be connected. For information about how to connect analog inputs, refer to Application manual/IED application/Analog inputs/Setting guidelines.

1MRK505228-BEN_E_en_Product_Guide__RED670_1.2_pre-configured.pdf

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