LV generator protection - engineering site - Schneider Electric

More documents

Recommendations

Info

undervoltage setting:setting range setting step accuracyactivation 100 à 690 V 5 V 0 % to 5 %thresholdactivation 0.2 to 5 s 0.1 s 0 % to 20 %time delayde-activation 690 V of activation 5 V 0 % to 5 %thresholdthresholdde-activation 0.2 to 36 s 0.1 s 0 % to 20 %time delayb overvoltage setting:setting range setting step accuracyactivation 100 à 1200 V 5 V -5 % to 0 %thresholdactivation 0.2 to 5 s 0.1 s 0 % to 20 %time delayde-activation 100 V of activation 5 V -5 % to 0 %thresholdthresholdde-activation 0.2 to 36 s 0.1 s 0 % to 20 %time delay4.2.2.5 Reverse active powerb applicationreverse power protection is used to protect generators connected with the mains(as an auxiliary or standby source) and generators operating in parallelautonomously (e.g. marine).NoteFor protection of generators driven by diesel sets, the threshold must be setbetween 5 and 20 % of generator active power for a period of 2 seconds.For protection of generators driven by steam turbines, the threshold must be setbetween 1 and 5 % of active power for a period of 2 secondsb principle:the function is activated when the active power flowing in the opposite flowdirection to the energy defined by the user, is greater than the activationthreshold for a time longer than the time delay.E88012EActivation zoneDe-activationzoneDe-activation time delayActivation time delayActivationthresholdDe-activationthresholdReverse powerFigure 29.35
The Schneiderprotection solutionb reverse power setting:setting range setting step accuracyactivation 5 kW to 500 kW 5 kW ± 2.5 %thresholdactivation 0.2 to 20 s 0.1 s -20 % to 0 %time delayde-activation 5 kW of activation 5 kW ± 2.5 %threshold thresholdde-activation 1 to 360 s 0.1 s -20 % to 0 %time delay4.2.2.6. Over frequency and under frequencyb causesincorrect operation of generator / motor setfrequency reduction is possible when a generator is on overloadfrequency increase is possible should the generator begin racing after losing itsload.b application:over frequency and under frequency protection is used to:Check generator frequencyCheck frequency at motor terminalsPrevent saturation of transformers further to a frequency reduction.b principle:the function is activated when frequency exceeds the programmed threshold fora time longer than the time delay.Over frequency monitoringDe-activationtime delayOver Fde-activationzoneOver FactivationzoneActivationtime delayFigure 30: Operation for overfrequency.De-activationthresholdActivationthresholdFrequencyE88007EE88013EDe-activationtime delayUnder FactivationzoneUnder Fde-activationzoneActivationtime delayActivationthresholdDe-activationthresholdFrequencyFigure 31: Operation for underfrequency.36
Page 1 and 2: M M M MLow Voltage Expert Guides N
Page 4 and 5: In shortGenerator Sets (GS) are use
Page 6 and 7: ImplementationThe Generator Sets no
Page 8 and 9: Note 2: If there is an MV Set in Pr
Page 10 and 11: E79360EElectrical utilityHV incomer
Page 12 and 13: Replacement SourceThe Set’s purpo
Page 14 and 15: 2.2. Transfer deviceIt is interesti
Page 16 and 17: 2.2.2. SequenceMain source / Genera
Page 18 and 19: 3.1.2. Short-circuit current protec
Page 20 and 21: 3.2. Downstream LV network protecti
Page 22 and 23: E79475EGSRemote control 2Remote con
Page 24 and 25: Short-circuit downstream of a UPSTh
Page 27 and 28: Protection and Monitoringof a LV Ge
Page 29 and 30: Protection and Monitoringof a LV Ge
Page 31 and 32: The Schneiderprotection solution4.1
Page 35: The Schneiderprotection solutionThe
Page 41 and 42: Summary5.1.DiagramA typical example
Page 43 and 44: Summary5.3. Summaryfunctions produc
Page 45 and 46: 6.1. Characteristics tablesof circu
Page 53 and 54: 6.2. Control unitscharacteristicsCo
Page 59 and 60: E887406.2. Control unitscharacteris
Page 61 and 62: 6.2. Control unitscharacteristicsMi
Page 73 and 74: CTCDCE6.3. Communicationcharacteris
Page 75 and 76: CD3 CD2 CD1CE6 CE5 CE4CD3 CD2 CD183
Page 77 and 78: 6.3. Caractéristiquesde la communi

LV generator protection - engineering site - Schneider Electric

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?