Electrical High Voltage Bushings

8/20/2019 Electrical High Voltage Bushings

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ELECTRICAL HIGHVOLTAGEBUSHINGS

GROUP 8

*PANLICAN, ARVIN NICO VILLANUEVA – #29

*RAZ, JOHN BENIDICT ENRIQUEZ - #30

*TAN, JASON ED!ARD - #3"


2/49

E$%&'(%) H(+ V&)$ B.+(/.

• T1$.

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• S)$&

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Bushing is an insulating stru

including a through conductor or provicentral passage for such conductor,

provision for mounting a barrier, cond

or otherwise, for the purpose of insu

the conductor from the barrier and electrical current from one side o

barrier to the other.


5/49

Types of Bushing

Composite Bushing - A .+(/ (/ 6+(%+ (/.)&(/ %/.(.&. ' '$ %):() )$'. 5(;$'$/& (/.)&(/ )&$'().<

Compound-Filled Bushing - A .+(/ (/ 6+(%+ &+$ .1)%$ $&+$ )=' (/.)&(/ 7' %/5%&' 6+$'$ / )=' (/.)&(/ (.)/5 &+$ (/.(5$ .')%$ ) 1'&$%&(>$ 6$)&+$' %).(/ 7.)1'%$)(/ (. ?$5 6(&+ ) %1/5 +)>(/ (/.)&(/ 1'1$'&($

Condenser Bushing - A .+(/ (/ 6+(%+ %(/5'(%) %/5%&(/)$'. )'$ )'')/$5 %):() 6(&+ &+$ %/5%&' 6(&+(/ &+$(/.)&(/ )&$'()< T+$ $/&+ )/5 5()$&$' &+$ %(/5$'. )5$.(/$5 & %/&' &+$ 5(.&'(&(/ &+$ $$%&'(% ?$5 (/ )/5 &+$ &$' .')%$ &+$ .+(/<


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C1.(&$B.+(/


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C1/5-@($5B.+(/


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CONDENSEBUSHING


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Oil-Filled Bushing - A .+(/ (/ 6+(%+ &+$ .1)%$ $)=' (/.)&(/ )/5 &+$ (/.(5$ .')%$ ) 1'&$%&(>$%).(/ (. ?$5 6(&+ (/.)&(/ (<

Oil Immersed Bushing - A .+(/ %1.$5 ) .

)=' (/.)&(/. &&) ($'.$5 (/ ) )&+ (/.)&

Oil-Impregnated Paper Insulated Bushing - A .+6+(%+ &+$ (/&$'/) .&'%&'$ (. )5$ %$.$ )&$(1'$/)&$5 6(&+ (<

Resin-Bonded, Paper Insulated Bushing - A .+(/&+$ )=' (/.)&(/ (. 1'>(5$5 %$.$ )&$'() 6(&+ '$.(/<

olid!Cerami" Bushing - A .+(/ (/ 6+(%+ &+$ )=(/.)&(/ (. 1'>(5$5 ) %$')(% ' )/). )&$


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D' ' U/?$5

T1$ B.+(/


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O(-?$5 B.

O( I$'.$5B.+(/


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Oil-ImpregPaper Insu

Bushing


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C$')(%B.+(/

R$.(/-B/5$5

B.+(/


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Safety/Precautions

At all times, safety is the most im

consideration. All testing work on bushinbe performed in accordance with the

(Reclamation Operation and Maintenanc

Standards which establish safety stand

safe work practices for operations and a

performed by the !ureau. "he follow

minimum suggestions for safety and

intended to supersede safety p


15/49

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). &)1$, '1$, ' 1'&)$ $/%$ .$%&(/.< S(/. '$)5(/

- DO NOT PASS THIS BARRIER, -- DANGER - HIGH VOL

.(()' /&(%$ .+) $ 1)%$5 )/ &+$ )''($'.

6'(/ )'$)<

i i d


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26/49

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Bushing Trou(lesT (l P ( R & 4 &+ 5 D & &(


27/49

Trou(le P..($ R$.&. 4$&+5 D$&$%&(/

Cra")ed por"elain

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$).

• @($' $). &

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"emented *oints

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• H&-6('$ &$.& '

(.&'$

• I/.)&(/

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insulation • 4(.&'$ $/&$'.

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older seal lea) • 4(.&'$ $/&$'.

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(et'een ground

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• Filler• Po'er fa"tor test


28/49

Oil migration• Filler

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/o oil • O( $). &

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0le"tri"al ashoer

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hort-"ir"uited

"ondenser se"tions

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• R$5%$5 >&)$ )&

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& (/.)&(/

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• P' &$.& '$.&.

• P6$' )%&' &$.&

• H& %)' &$.&

S& B +(


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I &( 5 P T &(


34/49

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• I/.1$%&(/ !+($ O& .$'>(%$K

• E$%&'(%) T$.&(/

• P6$' @)%&' T$.&(/

• Should perform upon installation to establish benchmark.

• This test is generally more effective on Silicon Carbide arresters than

arresters in detecting internal contamination or breakdown of spark ga

valve blocks.

• Make the measurement with the highest voltage available on the test s

without eceeding the line to ground voltage of the arrester under test

• The values that are measured are the leakage current !less than " mil

amperes$ and watts loss !less than %&' m($. These tests can only be

utili)ing a %'kV power factor test set.

P6$' @)%&' T$.&K


38/49

T$.& R$.&./ ) G5 A''$.&$'

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P+).$ '$.&. 7%1)')$ & ) )''$.&$'. &$.&$5 &+$ .))$ )/5 5$

A !)&&.

T1 0


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R$&)(/(/ 1)&$ '$>$5 )/5 .$)1)&$ $:1.$5<


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U/5$' .(5$ S$) 1)&$ )&$' '$>)

N&(%$ &+$%''.(/ )/5.(/. (.&'$


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I/.(5$ )''$.&$' 6(&+ S$) 1)&$ '$>$5

N&(%$ &+$%''.(/ )/5.(/. (.&'$


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ABB I/>$.&()&(/32002

A %.$ (/.1$%&(/ &+$ .$) 1)&$'$>$)$5 ) %')% (/ &+$ 1)&$<


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ABB I/>$.&()&(/32002

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4$$' T$.&K


45/49

• I/.1$%&(/ !+($ O& .$'>(%$K

• E$%&'(%) T$.&(/

• I/.)&(/ R$.(.&)/%$• *n arrester is to act as an insulator a ma+ority of its in service life. ,t w

allow current to flow to ground during high voltage transients generallycaused by lightning.

• Make the measurement with the highest voltage available on the test swithout eceeding the line to ground voltage of the arrester under test

• -eadings should be comparable to similar arresters. The value shoulgreater than '' Mega Ohms. This test is generally more effective on

Silicon Carbide arresters than MOV arresters in detecting internalcontamination or breakdown of spark gaps or valve blocks.

• MOV arresters may show a high insulation resistance value after anoperation but still be failed as an open circuit.

4$$' T$.&K

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• 4ercise 45T-4M4 caution while investigating problems and handling suspec

arresters. Sealed Silicon Carbide and MOV arresters may be under pressure dbuild up of fault gasses.

• Visually inspect suspect arresters carefully while looking for burn deposits near

chutes on Silicon Carbide arresters.

• MOV arresters may show very subtle signs of failure such as deformation of th

polymer covering. 6enerally7 MOV arresters will fail and split the polymer cove

fracture the porcelain cover.

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Electrical High Voltage Bushings

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