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owais766 Two more considerations: 3. I'm excluding LV, 380V systems 4. No, not low Impedance grounding! Instead, Distribution-Xfmer-Grounding. It was covered in an earlier Forum. When I find it I'll provide details?

owais766 When the neutrals of a group of generators in parallel are solidly-earthed, then the following should be considered: 1. Earth-Fault current at any location will be the total of all, limited only by the magnitude of the Fault impedance at the fault location. Thus, discrimination, as to...

OWAIS766... Welcome to Control Automation. Solid earthing of Generators, assures destruction of generators! Regards, Phil Corso

mahjoub abdallah You have far too many earth connections. I suggest you contact the mfg of the Differential-Relay for aid! Regards, Phil Corso

Welcome to Control Automation. 1. Very important. Provide Single-Line-Diagram (SLD)! 2. Name of Relay Mfg! Regards, Phil Corso

HSH5757... Welcome to Control Automation My copy of NFPA-70, 2017 version, does not contain the term "SCE". Can you provide the source that does? My opinion is a speed problem with an engine-driven fire-water pump will be revealed as a water pressure problem! Best wishes to you and yours in this...

@ Dave But the discussion is about I(t) Phil

LeVanw... To be clear I assumed by "Current" you meant that capacitors charged at Voltage "E" are discharged by providing a conducting-path between its terminals! That path can be a resistor, inductor, even shorting it! If so, then the answer to your question is "YES"! Phil

leVanw... Welcome to Control Automation! If you are speaking of an RC circuit the current discharge rate is not proportional to capacitor size. However the circuit's time-constant, RxC, is used in an exponential decay calculation for current discharge! Let us know If you need additional info...

Polash... If you prefer to not discuss the problem publicly my e-mail address is [email protected] ! Regards, Phil Corso

Mutahir... Last question (I promise)! 5. How about details on generator enclosure: Drip proof; TEFC; air cooled with air from non-hazardous area. If the latter what is shaft-bushing material? If your answer is positive, then the problem could be related to something called the "MORTON" effect...

Mutahir... 1. Do the trips occur with some regularity with regard to activity, such as shift change? 2. Do the trips occur with some regularity with regard to time of day? 3. Are there other physical operations, such as heavy construction, occurring nearby? Regards, Phil Corso

Polash... Welcome To Control Automation! Presuming it is 3-phase system what are system parameters: Q1, The Neutral Current? Q2, The 3 Phase Currents? Q3, The 3 Phase to Phase Voltages? Q4, The 3 Phase to Neutral Voltages? Regards, Phil Corso

Samsoon It depends on the Parameters of the LCI used. Those, for Mr. Niazislam's project had the particular parameters needed for his project! Send your E-mail Address and I will send it to you! Regards, Phil Corso [email protected]

Samsoon You are right. I'm talking about apples and you oranges! Have a good life! Regards, Phil Corso

@Samsoon Welcome to Control Automation! The simple answer to your question is yes. The typical LCI uses the Generator, first as a Motor to accelerate, then it becomes a Generator. Neither has to be in motion prior to a cold startup. The answer was presented in Mr. Niazislam's question to this...

P Picardi Welcome to Control Automation! Are you describing an Intrinsically-Safe area? Regards, Phil Corso

sahil3143 Welcome to Control Automation! For your problem I suggest your contact Endresser+Hauser about their FMR63B instrument that detects heavy foam buildup! Regards, Phil Corso

Hyuncheol Kim Perhaps the clash is about conductor color. In this situation the usual solution is to abide by the AHJ, or Authority Having Jurisdiction! Phil Corso

5. If inside an Ex 1a zone, where is certificate?