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Hi experts The ground system of our (industrical plant) is baised on many ground rods in diffents areas ,that are connected to the same ground network. using Megger DET24C . The measurmetns of some rods show relativluuty high grounding resistance (40 to 110 Ohm) . what is the minium reading and...

Thank you all ,yes I meat broke delta connection from the residual VT connection. NER :neutral earthing resistor is opened in TR star point and closed in generator star point

A new 30MvA 11kv generator connected to a new abb 35MVA 11/20kv ynd11 transformer.to be synchronized with other genset in 20kv busbar. My questions are: 1-We started the set with no load ,all phases voltages in transformer output are identical 20kv but residual voltage (read from broken delta...

HI How to select the earth fault protection set point for the low voltage electrical motors? Does it depends on the system voltage, motor size? Earthling system type? I can make an example: 0.4kv 37kw induction motor, neutral is direct connected to ground?

olympian GEH250 cracks but can’t startup ,only if fuel valve supplied directly. With out diagnosis tool it is difficult to diagnostic the fault in ECM Is there any way to spot which sensor by unplug the defect one or any other way

Dear Che This is the name plathttps://files.engineering.com/getfile.aspx?folder=0f5faec4-62b2-4d37-b524-c6e0bb8fca7b&file=20914999-671A-48B3-8119-53B50D112EAC.jpeg

Hello A very old 37.5kva GM generator with Markon alternator. It gives 3ph 220 volt with manual voltage regulator (external auto transform) Please see the pictures. I would like to convert the system to be 3ph 400v but the connection of alternator terminals look confusing Can any check the...

Thank you very much . in regard to your inquiries ,the measurements in done using bar-type CTs read by Sepam M20. the 6.6kv system is supplied by NER transformer. the motor is protected by earth fault protection using toriodal CT .

Hello The second attached picture is for the same motor with full load. The zero off set value is declined but remains some different. The motor now is running with full load ,170A ,but with some buzzing or hamming. CBM team check the vibration and informed me that the bearings and all...

Hello 1.8kw ,6.6kv motor was in solo running with out coupling .what is the response of phase 2 current displacement as shown in graph . https://files.engineering.com/getfile.aspx?folder=193d5823-ca34-44be-9469-6bb0b9d8e1bf&file=D054C86F-520A-4115-B59B-E15750891160.jpeg

Hi Folks RTD Pt 100, fixed on the bearings of 1.8MW motor . Due to failure in the lubrication system . the bearing were melted and the motor stopped manually before the RTD detected the over temperature. The RTD removed to be tested in heating bat, the temperature take 8min to rise form 20c to...

Hi caterpillar controller 1.1 fail to switch to auto mode because push button. Can I set a free input to switch the mode to auto . If so,can that be done by a manual programming?

Dear Folks, Power transformer 20kv/6.6kv 5MVA ,transformer outgoing tripped by (27),l1=6.2 l2=5.5kv l3=4.3kv ,it seems that the voltage dipping is in one phase only L3 the transformer is protected with many protection units (87T,50,51,64) but non has popped up except 27 -no new load was...

Hi Folks Caterpillar generator engine C15 controlled by PowerWizard The controller can not run in auto mode during simulation of power cut. When manual mode activated the machine run only while holding run button and stopped when Leaving it.

Hi Folks cat engine driven by ecu with a VLPM Voltage load protection module ,is it possible to bypass this defected module,if so what is the procedure?https://files.engineering.com/getfile.aspx?folder=203b09f2-1a52-481a-b112-e34df900c26a&file=8FD35007-E49E-4C64-9A78-D8D2F4DABCB1.jpeg

Old AVR picturehttps://files.engineering.com/getfile.aspx?folder=cfd210db-5c48-479f-a65f-19b1c394f2e9&file=DE93AA2B-29FB-4BB5-BE58-C44A09028085.jpeg

Hi folks A compound avr (coils) as shown in attachment has a damaged coil. Is possible to change it with an electric avr (self excitation) What kind of re-wiring need ? Amplitude of need AVR...

Hi Thank you for variable tips. The PF for the same load supplied by national grid is almost 0.7. Can the AVR or diode affect the PF

Hi folks, A 3ph PMG generator driving load with a very low power factor 0.37. The engine fail after 2 to 3 hours. Please see the attached picture. What are the reasons of low Pf rather than load types .would the low pf course generator to shut down with out a alarm...

Hi folks, 1-What are the side effects of unbalanced loading of three phase generator? 2-What are the acceptable range of current unbalancing that will have no serious effect to the generator? 3-If the windings of generator has reconnected to be a single phase rather than three phase Does...