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Qaagi - Book of Why

Causes

Effects

a fault(passive) caused bythe negative sequence current

load unbalance(passive) caused bynegative sequence current

an unbalanced load(passive) caused bynegative sequence current

Series faults close to the generatorwill causenegative sequence currents

the load to improve power system balance(passive) caused bynegative - sequence current

imbalance faults on the load side of the primary sub station(passive) caused bynegative sequence current

Unbalanced phase currentscreatenegative sequence current in Negative sequence

The imbalance in phase and magnitudecausesnegative sequence currents

the portion of the systemis causingnegative sequence currents

this type of event(passive) created bynegative sequence currents

The unbalanced set of 3-phase voltagescausesa negative sequence current

unbalanced loads(passive) caused bynegative sequence currents

phase voltage unbalance and phase to phase faults(passive) caused bynegative sequence currents

Unbalanced supply voltage given to a 3 - φ , delta connected induction motorwill causenegative sequence current

unbalance loads , which ensure balanced 3-phase grid current(passive) caused bynegative sequence current

electrical grid faults(passive) caused bynegative sequence currents

the carrier potential injection(passive) caused bynegative sequence currents

unbalance loads , which ensurebalanced 3-phase grid current(passive) caused bynegative sequence current

the rotor(passive) created bynegative sequence currents

earth faults(passive) caused bynegative sequence current

asymmetrical loads in industrial field(passive) caused bynegative - sequence current

ableto createa negative - sequence current

the DC injection(passive) caused bythe negative sequence current

the heating of the generators and transformerscausesthe heating of the generators and transformers

voltage unbalance ( known as negative sequence voltagewill causevoltage unbalance ( known as negative sequence voltage

The stator core resonance of hydro - electric generator(passive) caused byThe stator core resonance of hydro - electric generator

in heating of the rotorresultin heating of the rotor

the rotor to overheatcausesthe rotor to overheat

rotor damage ... and that damage is highly detrimental to rotating machines such as motors and generatorscould causerotor damage ... and that damage is highly detrimental to rotating machines such as motors and generators

impermissible overheating of the rotorcauseimpermissible overheating of the rotor

the overheating in rotor of motor(passive) caused bythe overheating in rotor of motor

supersynchronous resonance in the rotor shaftmay causesupersynchronous resonance in the rotor shaft

counter rotating torque in the rotor which acts against the normal torquecausecounter rotating torque in the rotor which acts against the normal torque

in rotor overheating along with increases in motor winding temperature , noise and vibration levelsmay resultin rotor overheating along with increases in motor winding temperature , noise and vibration levels

from the systemresultingfrom the system

such , mechanical motor vibrations(passive) caused bysuch , mechanical motor vibrations

torque pulsations(passive) caused bytorque pulsations

in unbalanced load currentresultsin unbalanced load current

excessive heating of electrical machines , saturation of transformerswill causeexcessive heating of electrical machines , saturation of transformers

Capacitor ripple voltage(passive) caused byCapacitor ripple voltage

from a series fault conditionresultingfrom a series fault condition

excessive heating in the generator windingscausesexcessive heating in the generator windings

from a turn faultresultingfrom a turn fault

Capacitor ripple current(passive) caused byCapacitor ripple current

overheating and shorten their lifecan ... causeoverheating and shorten their life

the DC current(passive) caused bythe DC current

from unbalanced disturbances on the distributor associated with disconnection of unbalanced loadsresultingfrom unbalanced disturbances on the distributor associated with disconnection of unbalanced loads

in a possibility to have less switching cells connected in series in each phase leg than when using a zero - sequence voltage referenceresultsin a possibility to have less switching cells connected in series in each phase leg than when using a zero - sequence voltage reference

fundamental - frequency component of capacitor current(passive) caused byfundamental - frequency component of capacitor current

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