GE IAV51A Instructions Manual Download Page 11

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(

Seal-in element
sta. contact-left

Seal-in element
sta. contact-right

Seal-in element

moving contact

assembly

Disk and

shaft

screw

Type

/A V

Undervoltage and Overvoltage Relays GEH-12668

Seal-in

element

oldin g

coil

Main stationary brush

and contact asse

Top pivot

Fig.

14.

Front view of Type

lA VSIA

relay withclrawn from case

Coi I

m agnet and

tap bl o ck assembly

Fig. 15. Bade view of Type

IAV51A

relay withclrawn from

case

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Summary of Contents for IAV51A

Page 1: ...LTAGE AND OVERVOLTAGE RELAYS TYPES IAVSlA IAVS3A IAVS2A IAVS4A IAVSSA IN THE DRAWOUT CASE GENERAL flELECTRIC GEH 12668 w w w E l e c t r i c a l P a r t M a n u a l s c o m w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 2: ... for every possible contingency to be met in connection with installation operation or maintenance Should further in formation be desired or should particular problems arise which are not covered sufficiently for the purchas er s purposes the matter should be referred to the General Electric Company w w w E l e c t r i c a l P a r t M a n u a l s c o m w w w E l e c t r i c a l P a r t M a n u a l...

Page 3: ... removed Then the connecting plug can be drawn out In so doing the trip circuit is first opened then the voltage circuits are opened After the connecting plug has been removed the lower latch can be re leased and the cradle easily drawn out To replace the cradle the reverse order should be followed Note Care must be taken to insert the connecting plug slowly on relays that have contacts which are ...

Page 4: ...on the seal in element is determined by the current drawn by the trip coil The 0 2 ampere tap is for use with trip coils that operate on currents ranging from 0 2 up to 2 0 am peres at the minimum control voltage If this tap is used with trip coils requiring more than two amperes there is a possibility that the seven ohms resistance will reduce the current to so low a value that the breaker will n...

Page 5: ...on the curve I I I I I I I I I I I I I I I I I I I I I Time to close left contacts when voltage is suddenly increased from zero to the values on the curve v 1 Q i r u o t CI f 1 1 Left contact closed r r 8 fi 0 0 f O J5l _o I 50 0 e r 60 g J r 70 E e 80 0 g 90 95 0 0 0 0 20 40 60 80 100 120 140 180 200 160 Per cent of voltag e required to close l eft contact Fig 3 Time voltage curves for TypeIAV53...

Page 6: ...ake 2 0 amperes or more at minimum control voltage provided the tripping current does not exceed 30 amperes at the maximum control voltage If the tripping current exceeds 30 amperes an auxiliary relay should be used the connections being such that the tripping current does not pass through the contacts or the target and seal in coil of the protective relay Burdens Burdens for the various relay typ...

Page 7: ...tely they should be stored in their original carton in a place that is free from moisture dust and metallic chips Foreign matter collected on the outside of the case may find its way inside when the cover is re moved and cause trouble in the operation of the relay Installation Location The location should be clean and dry free from dust and excessive vibration and well lighted to facilitate inspec...

Page 8: ...d at the factory to operate from any time dial position at a minimum voltage within five per cent of the tap plug setting The relay resets at 90 per cent of the 8 minimum operating value on all relays listed except the IAVS3A which will be explained later Operating voltage for the IAVS1A and the IAV52A is the minimum voltage for a given tap setting at which the contacts just make Operating voltage...

Page 9: ...he desired characteristic by turning it until the number lines up with the notch in the adjacent frame The time indicated by the curves is the time required to close the relay contacts when the voltage is suddenly increased from a value below pickup to the value on the curve Time settings on the IAV54A and the IAVSSA are quite similar except that their characteristics as shown in Fig 4 indicate th...

Page 10: ...mmended test connections for the above tests are shown in Fig 12 for the lAV51A and the lAV 52A Fig 13 shows test connections for the lAV54A and the lAVSSA The lAV53A can be checked for time of closing left contacts by using connections shown in Fig 12 and for closing right contacts 10 R A c supply of correct frequency c O M Synchronous timer type MF 2 Fig 12 Connectio s for testing Types IAV51A a...

Page 11: ...s GEH 12668 Seal in element holdin g coil Main stationary brush and contact assem bly Top pivot Fig 14 Front view of Type lAVSIA relay withclrawn from case _ _ _ Coi I m agnet and tap bl o ck assembly Fig 15 Bade view of Type IAV51A relay withclrawn from case 11 t w w w E l e c t r i c a l P a r t M a n u a l s c o m w w w E l e c t r i c a l P a r t M a n u a l s c o m ...

Page 12: ...months are recommended Test connections are shown in Fig 12 and 13 Renewal Parts It is recommended that sufficient quantities of renewal parts be can ied in stock to enable the prompt replacement of any worn broken or dam aged parts Those most subject to wear in ordinary operation and to damage due to possible abnormal conditions are listed below For illustration of parts see Fig 14 and 15 Orderin...

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