Title: generator rotor earth fault protection FromElectrical of
Cable-online Time:Tue, 04 Dec 2007 07:53:32 +0000 Author:Tiny
URL:http://www.cable-online.cn/article/generator-rotor-earth-fault-protection/
Content: 1 Introduction # 3 Generator of a power generation company
model: TS854/156-40, rated capacity : l00MVA, rated voltage:
13.8KV, rated current: 4180A, rotor voltage: 320V, the rotor
current: 1225A, by Harbin Electrical Machinery Plant in 1965
manufacturing in November, in May 1966 to run power input, 19% in
May for Rehabilitation, and put into operation since the operation
in good condition. # 3 Generator Unit Pr otection NARI Relays
Electric Co., Ltd. with the production of RCS-985R/S/T comp uter
protection device, the rotor protection using switching (ping-pong
type) sa mpling theory, high-performance DC input isolation
amplifier By switching two di fferent electronic switch, get four
different ground loop equations, real-time c omputing rotor winding
voltage, grounding resistance Rg, ground location a, and the
results measured directly in the management of machines displayed
on the LCD screen. When the hydroelectric generator rotor
insulation resistance of a decli ne shaft, rotor grounding
protection movement, an alarm signal, and automaticall y input by
the delay of two points rotor ground fault protection, when the
earth reaches a certain position of a change in the value of two
points when the roto r ground Protection Tripping down. 2 anomalies
At 23:42 on January 17th, 2005 when the computer monitoring system
alarm: "3 # machine protection device Alarm Action" "3 # rotor
grounding alarm action," on-s ite inspection of Unit 3 protection
device LCD display shows the Rg = 3K (normal value of 300K), U, 2 =
192V (normal is about 127V or so), excitation circuit vi sual
inspection found no abnormalities, fault signal can not be reset.
23:52 3 # when to contact the transfer machine down to check the
rotor ground fault, the signal disappeared after being stopped, the
rotor ground, cut the generator exci tation switch FMK, shaking the
rotor insulation resistance test: R = 200M52, loa d test normal, 3
# machine recovery set aside. At 13:32 on January 18, the 3 # m
achine and human systems, 13: 43, computer monitoring system
reported that the s ame signal, on-site inspection of Unit 3
protection device LCD display shows the Rg-0.9K, UF.2 = 192V,
measured ground voltage of the rotor is obtained, 100V or so, about
the negative-to-ground voltage 65V (total voltage of 165V), fault
sig nal can not be reset, 14:18 # 3 machine and found the LCD
screen protector was R g = 300K, press the reset button Rotor
ground signal reset. Similar to the above situation occurred within
the next several days, stop examination revealed no a bnormalities.
3 Analysis According to the above anomalies, combined with previous
experience of dealing with the rotor ground fault, a preliminary
analysis that resulted in 3 # rotor g round fault protection device
operated alarm may have the following three reason s: first, caused
by abnormal rotor ground fault protection device; the second is the
external rotor pole equipment (including power units, FMK switch,
the rotor slip ring brushes, rotor wire, etc.) failure caused;
third is a ground rotor po le phenomenon. Computer protection
device as RCS-985R/S/T renovation completed i n 2004, during the
test at the start, has repeatedly appeared "rotor grounding a larm"
signal, on-site inspection device LCD display and measure the
insulation r esistance and rotor positive and negative ground
voltage without exception, reve rted to the normal alarm signal,
the initial computer protection device to deter mine the
RCS-985R/S/T caused by abnormal high probability. 4-site
inspection, testing and treatment We first check the ground
protection device (shaft) brush, fixed solid, good co ntact, and
for cleaning, boot test the fault persists, ruled out due to ground
( the shaft) the fixed brushes or oil stains are caused by unstable
poor contact c
reate a "fake ground" phenomenon. Then check RCS-985R/S/T
computer protection de vice, the device test data of the measured
normal and no abnormality was found, while consulting the
manufacturer, the answer is no problem with the device itse lf. To
further verify the RCS-985R/S/T computer protection device itself
is prob lematic, at 17:40 on January 20 at 3 # Unit of protection
when the external acce ss conventional rotor grounding protection
relay, the same test results start a "rotor grounding alarm
"signal, which indicates that RCS-985R/S/T computer prote ction
device itself is normal. Then, the rotor pole peripheral equipment
(including power units, input and out put Knife, FMK switch, the
rotor slip ring brushes, rotor wire, etc.) carefully check the
overall appearance of the rotor circuit was grounded phenomenon and
fo und traces of partial discharge, the connection thread tight
solid, good insulat ion resistance were measured in various
ministries, the test data correctly, and no abnormality was found.
The rotor slip ring, brush, brush the suction brush, boot test,
check the thyristor excitation regulator working properly, but the
ro tor ground fault persists, remove the excitation current, jump
in electrical exc itation switch FMK, can be opened control of
silicon power cabinet input, output switch, with 500V megger is
measured in the rotor slip ring rotor insulation re sistance
between the 0.02-180Mn cyclical swing. After the removal of
windshield down, check that the generator rotor pole 17 # -18 #
with the lead wire around the burned hole plate nuts, remove the
inspectio n plate bolts have been found to lead burning 2 / 3.
Because the magnetic lead p late nut loose, the rotor magnetic
poles during rotation under the action of cen trifugal force,
magnetic pole lead and lead displacement between the nut plate,
coupled with the electromagnetic force and mechanical vibration
caused by the jo int action of the magnetic pole lead and lead
plate nut insulation between the w ear and tear. When the units are
stationary, the magnetic pole between the lead and the lead plate
separation nuts, ground disappears. When the unit rotates, th e
rotor pole lead * lead plate nuts, bolts, rack form a ground loop,
resulting i n dynamic ground discharge phenomenon, the nut plate in
the lead around the blac k hole burning due to local overheating.
Cleaning of the fault point, the elimin ation of carbon black, and
the failure to repair parts processing, winding ribbo n of glass,
coated with epoxy paint, the replacement of burning lead plate
bolts , fixed matter, measuring the rotor insulation resistance R =
172M52, unit recov ery backup. The next day they start a "rotor
grounding alarm" signal, this time it was wide ly suspected last
night, poor handling or process is not complete, after the shu
tdown, carefully examine the measurement of the Department and
found no abnormal ities. For insurance purposes, the Department has
re-opened, dressing, fixed pro cessing, measuring insulation
resistance of qualified, but the boot test failure s have not been
eliminated, the Failure and previous similar, indicating that th
ere is still another part of the rotor pole dynamic ground. Failure
to thoroughl y investigate the reasons, we changed practice, the
first winding voltage distri bution method based on ground magnetic
pole position to judge about between 24 # -25 #, were hanging out
the 24 #, 25 #, pole, pole inspection found lead with 2 5 #
discharge burning black signs, removal of the point of failure of
carbon bla ck, hair cleaning and the repair process, after the
insulated wire wrapped in th e interior T: 18.80C, H: 66%
environment, 25 # pole test data in Table 1. Respectively, 24 #, 25
# pole lifting, in the lead before connecting, T: 18.70C , H: 66%
environment, the measured magnetic insulation resistance of 25 #:
3600M 52, 1 #-V24 # poles must stop: 1300M52 (including the slip
ring), 26 # 40 # Pole Insulation resistance: 1060 M52 (including
the decline in ring). After assembly , the epoxy paint did not dry
conditions, the measured rotor DC resistance: 0.17 6052, rotor
insulation resistance: 60M52, contact between pole resistance test
d ata in Table 2. Pole cross-resistance test data in Table 3
Measured test data of the normal, the lifting of security measures,
the boot te st, to eliminate the phenomenon of the rotor ground. At
17:00 on the 26th _ 3 # machine when the power delivery system,
operating normally. 5 Conclusion
# 3 Generator Rotor Dynamics from Ground Fault processing point
of view, the lo ng-term operation in the generator, the rotor
magnetic poles during rotation by the centrifugal force and the
electromagnetic force, mechanical vibration caused by the joint
action, resulting in loose pole , lead by pulling part of the role
of repeated, insulation damage resulting from ground fault. This
dynamic earth fault with the magnetic rotation is related to ground
disappears and the station ary state, which points to the failure
to find and deal with more difficult, in previous cases, the rotor
ground fault is relatively rare. Therefore, the future can not be
ground fault on the rotor dynamic experience or simply the inertia
o f thinking to analyze and judge the cause of the malfunction, in
conjunction wit h the actual situation, put forward constructive
analysis and processing methods , the same time, pay attention to
the rotor pole manufacture, repair installatio n process quality
from the source Safety on the good quality. [reply author=Walker
replytime=1296935142]between the rotor circuit and earth) o r the
tte7017 (which applies a low frequency . 5.10.3 rotor earth fault
protecti on [64f] when an earth fault occurs in the field circuit
.[/reply][reply author= Cassandra replytime=1297183722]protective
relay application guide[/reply][reply author=Ian
replytime=1297232056]the sensitive earth-fault relay spaj 111 c is
us ed as a neutral current measuring feeder earth-fault relay, as
generator intertu rn fault protection, as capacitor bank
.[/reply][reply author=Alon replytime=129 7280536]abb spaj 111 c -
earth-fault protection (additional numerical .[/reply][ reply
author=Fiona replytime=1297533372]the following are the main
protection sc hemes adopted for our generator. the rotor earth
fault may be caused due to insu lation failure of winding or
.[/reply][reply author=Ben replytime=1298786419]gen erator
protection schemes[/reply][reply author=Debbie
replytime=1299885815]so ro tor earth fault protection is provided
to restrict the fault spreading. 2.1 roto r earth fault
protection:-as the field circuit are operating unearthed a .[/repl
y][reply author=Rose replytime=1299957278]project
report[/reply][reply author=El ma replytime=1300318677]three-phase
overcurrent, earth fault and sensitive earth fault relay . relay
for 100% generator stator earth fault protection. a. ub0/cr . rotor
earth fault relay. a .[/reply][reply author=Patrick
replytime=1300351965 ]01. feeder protection relays[/reply][reply
author=Andy replytime=1300662697]woo dward seg offers you
protection and control relays - overcurrent protection - di
fferential protection, motor protection, generator protection,
mains decoupling .[/reply][reply author=Hiram
replytime=1301127345]woodward seg protection relays overcurrent
protection for .[/reply][reply author=Angus replytime=1301430328]th
e rotor circuit of a generator is normally isolated from earth.
diagram 1mrk 002 398-aa for rotor earth-fault protection 1mrk 002
397-aa .[/reply][reply author= Valentine replytime=1302637804]use
of rahl/rxhl421 as rotor earth-fault protecti on[/reply][reply
author=Abby replytime=1304082005]100% rotor/stator earth-fault unit
protection (injection principle) . title: enhanced generator and
transforme r protection for continuous and secure power
.[/reply][reply author=Gene replyti me=1304160264]abb reg216 -
generator protection (transmission protection .[/repl y][reply
author=Harlan replytime=1304582853]the generator rotor protection
relay mrr1 com-bines rotor earth fault protection, excitation over
. detection of hig h impedance earth faults with a test frequency
of 0.5 hz .[/reply][reply author= Rockwell
replytime=1304714422]mrr1 multifunctional generator rotor
protection rela y[/reply][reply author=Armstrong
replytime=1305753227]6 rotor earth-fault protec tion. the rotor
circuit can be exposed to abnormal mechanical or . the rotor ear
th-fault relay type rxnb 4 injects a dc voltage of 48 v
.[/reply][reply author=W illie replytime=1306333074]generator
protection[/reply][reply author=Camille rep lytime=1306988811]fig.
3 stator earth-fault protection with generator, 20 hz . g enerator
protection. fig. 6 principle of rotor earth-fault protection. the
diffe rential .[/reply][reply author=Oprah
replytime=1307482515]unit protection system for pumped-storage
power stations[/reply][reply author=Antonia replytime=130748
7980]now the rotor was fastened up and the new installed generator
was destroyed completely. earth fault protection and other devices
for generator protection . [/reply][reply author=Wanda
replytime=1308146630]pac world magazine : protection history.
reverse-power .[/reply][reply author=Matt
replytime=1308297093]generat
or, transformer, motor, feeder and switchgear protection schemes
. generator pro tection schemes. transformer protection schemes.
motor protection. switchgear .[ /reply][reply author=Ashbur
replytime=1308821537]p-tec2[/reply][reply author=Per ry
replytime=1309216918]protection of the generator against phase to
earth and p hase to phase fault. limitations of this method: the
earth fault is limited by t he resistance of the neural
.[/reply][reply author=Lydia replytime=1309816700]ge nerator stator
protection, under/over voltage, under /over .[/reply][reply autho
r=Lawrence replytime=1310240549]e/f protection (51n) : this will
protect the gen erator from hazardous . a) 100% earth fault
protection : this will help in sensi ng earth faults close to
neutral.[/reply][reply author=Arvin replytime=131091364 4]4.
generator protection typical schemes and l&t
solutions[/reply][reply author =Lee replytime=1313274973]numerical
integrated generator protection (rotor and a uxiliary protection):
64r - 27 d.c. rotor earth fault detection based on. inject ion of
a.c. low voltage .[/reply][reply author=Brent
replytime=1314996035]module x3 line mx3ipg2a numerical integrated
generator .[/reply][reply author=Grace rep lytime=1315235786]2.
generator stator internal and external fault. simulation pr
otection scheme and relay . protection relays: composite generator.
protection r elay, earth fault .[/reply][reply author=Gary
replytime=1317280193]directorate o f technical
education,[/reply][reply author=Beata replytime=1317790639]rotor
ove rload protection. 49. x. x. x. x. x. earth-fault protection .
rotor earth-fault protection (ansi 64r) sensitive earth-current
protection is used for de .[/reply ][reply author=Emily
replytime=1319203814]protection of a medium- sized generato r up to
5 mw[/reply][reply author=Michaelia replytime=1319286342]coupling
device for rotor earth-fault protection 50/60 hz . coupling unit
for rotor earth-fault protection 50/60 hz. configure / add to my
products .[/reply][reply author=Emma nuel
replytime=1319489326]siemens ag - 7xr61 - coupling unit for rotor
e/f (50/6 0hz)[/reply][reply author=Theobald
replytime=1320190238]rotor earth fault protec tion, are applied
comprehensively, thus . scheme stator earth fault protection i s
one function of generator. protection, while the .[/reply][reply
author=Althea replytime=1320343281]discussion on optimized scheme
of generator -transformer u nit .[/reply][reply author=Lora
replytime=1321773794]earth fault (e/f) protectio n: protection in
which. the residual . it should be noted that if the generator
set's short. circuit power is low compared with .[/reply][reply
author=Richie re plytime=1322472815]directional protection
equipment[/reply][reply author=Carrie
replytime=1322676661]operation of rotor earth fault protection.
subsequent inves tigations . the rotor earth fault protection was
also wired for tripping of unit by sensing .[/reply][reply
author=Mortimer replytime=1322754478]failure analysi s of genertor
rotors ? causes and preventions[/reply][reply author=Fat replytime
=1323217108]actual field like reverse power protection, stator and
rotor earth . power relay, stator earth fault relay and the
synchronizing. arrangement are sh own in the figures 1 and 2
.[/reply][reply author=Mariah replytime=1323324532]la boratory
simulation of generator protection[/reply][reply author=Hedy
replytime= 1323461167]when generator starts running as a motor it
is called as inverted ope ration. earth fault on the rotor shorting
of the rotor at one point to .[/reply][r eply author=Salome
replytime=1324519385]major faults in generator,generator prot
ection, failure of .[/reply][reply author=Louis
replytime=1325578555]earth-fault relay for selective earth-fault
protection, either primary or back . sensitive earth-fault relay
for neutral current measuring, generator interturn fault, .[/r
eply][reply author=Heather replytime=1325693636]abb earth-fault
protection - add itional numerical relays .[/reply][reply
author=Lucineu replytime=1325761450]sta tor earth fault. 64s. rotor
earth fault. 64r. under-frequency. 81 . the electric al protection
system is superimposed onto the governing and. control tasks in .[
/reply][reply author=Miya replytime=1325791792]generator and
turbine protection systems[/reply][reply author=Norma
replytime=1326005235]controlling unit f. roto r earth-fault
protection (0.5 to 4 hz) skip over site identifier . controlling d
evice for rotor-earth-fault protection (0,5 ti 4 hz) 7xt71 in 7xp20
.[/reply][re ply author=Marcy replytime=1326858971]siemens ag -
7xt71 - controller unit for r otor e/f (1-3hz)[/reply][reply
author=Anitaanita replytime=1326925926]earth prot ection of
generator rotor in connection with current injection unit piz 50v
and protection rej 521 . earth protection of generator rotor in
connection with curr
ent .[/reply][reply author=Sidon replytime=1327582638]earth
fault protection of generator rotor[/reply] Generated by Bo-blog
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