I Nstallat Ion; Location; Mounti Ng; Ground Connections - GE IAV51A Instructions Manual

C . P I CKUP VOLTAGE TEST
The pi ckup vol tage shoul d be checked on one or more taps on rel ays wh i ch cl ose contacts on i ncreas i ng
vol tag e . The drop- out vol tage shoul d be checked on o n e or more taps on rel ays which cl ose contacts o n
dec reas i ng vol tage . See rel ay namepl ates for val ues of p i c kup or drop-out vol tages ( c l os i ng vol tages , ri ght
or l eft contact ) .
D . T I ME-VOLTAGE TEST
The ti me- vol tage curves shoul d be checked for one or more s etti ngs .
Recommended test connect i on s for the above test a re s hown i n F i g . 17 for the overvol tage rel ays such
as the Types IAV5 1A and I AV52 A .
and IAV53 D can be c hec ked for t i me of c l o s i n g l eft contacts by u s i n g connect i on s shown i n F i g . 17 , and for
cl o s i n g r i g ht contacts by the connect ions shown i n F i g . 18 .
i s not u sed i n the case of the I AV53B and I AV53D , but al l stud n umbers a re correct .
s houl d be substi tuted for stud n umbers 9 and 10 on F i g . 18 for test i n q the undervol tage contacts of the
( See i nternal d i agram , Fi g . 5 . ) See i n terna l connecti ons , F i gs . 6 -8, for contact and co i l
Type IAV53C rel ay .
connections for I AV5 3 K , IAV53L , I AV53M and IAV53N.
I NS PECT I ON
At the time of i ns ta l l ati on , the rel ay shou l d be i ns pected for tarn i shed contacts , l oose s crews , or
other i mperfecti ons . I f any troubl e i s found , i t shoul d be corrected i n the manner descri bed u nder
MA I NTENANCE . Check the namepl ate for model number and rati ng .
L OCAT I ON
The l ocati on shoul d be cl ean and dry , free from dust a nd exces s i ve v i b rati on , and wel l l i ghted to
fac i l i a te i ns pecti on and testi ng .
MOUNT I NG
The rel ay s houl d be mounted on a vert i ca l s urface.
i n F i g . 19 for rel ay Types IAV5 1A , I AV52A and I AV53 C .
Types IAV53A , I AV53B and IAV53D.
IAV53L , I AV53M a n d I AV5 3 N .
CONNECT IONS
Internal connecti ons a re shown i n F i gs . 1 to 8 for the vari ous rel ays .

GROUND CONNECTIONS

One of the mounti ng s tuds or screws shoul d be permanently g rounded by a conductor not l ess than No . 1 2
B&S gage copper wi re or i ts equ i val ent.
FI ELD I NSTALLAT I ON TESTS
Before the rel ay i s put i n serv i ce , the p i ckup vol tage and time-vol tage tests descr i bed i n ACCEPTANCE TESTS
( EL ECTR I CAL TESTS) shoul d be made to determi ne tha t the adj us tments have not been d i sturbed .
Th e rel ay may be tes ted wh i l e mounted on the panel , e i ther from i ts own or another s ource of powe r ,
by i nserti ng a separa te testi ng p l ug i n p l a ce o f the connecti n g pl ug .
and repl aced by another wh i ch has been l abora tory tested .
In v i ew of the vi tal rol e of protecti ve rel ays i n the operation of a power sys tem i t i s i mportant that
a peri od i c tes t program be fol l owed .
dependi ng upon envi ronment , type of rel ay and the user ' s experi ence wi th pe ri odi c tes ti ng .
has accumul ated enough exper i ence to select the tes t i nterva l best s u i ted to h i s i ndi v i dual req u i rements
it i s s ugges ted tha t the po i nts l i s ted u nder I NSTALLAT ION PROCEDURE be checked every s i x month s .
G EH - 1 81 4
The under- a n d overvo l tage rel ays s u c h a s t h e Types I AV53A , I AV53B , IAV53C

I NSTALLAT ION

F i g . 2 0 s hows outl i n e a n d panel dri l l i n g for rel ay
Fi g . 2 1 s hows the outl i ne and panel dri l l i n g for rel ay Types I AV5 3 K ,

PERIODI C CHECKS AND ROUT I N E MAI NT ENANCE

It is recog n i zed th at the i nterval between peri odi c checks wi l l vary
9
Of course the seal - i n un i t shown i n the fi gure
The outl i ne and panel dri l l i n g d i men s i on s are s hown
O r , the cradl e can be drawn out
Stud n umbers 1 and 2
Unti l the u ser