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GEI-50261

1

(a)

VT

3

1

(c)

3

SYSTEM VOLTAGES

(a) BALANCED CONDITIONS

VT

(b) UNBALANCED BY SHIFT OF ONE CORNER

(c)

UNBALANCED BY SHIFTING

TWO

CORNERS

(b)

TOWARD EACH OTHER ALONG VECTOR BETWEEN

THEM.

2

Figure 9 (0459A0252-1) System Voltages under Balanced and Unbalanced Conditions

18

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Summary of Contents for NBVllA Series

Page 1: ...NGS 4 CALCULATIONS 6 CONSTRUCTION 7 RECEIVING HANDLING STORAGE 7 ACCEPTANCE TESTS 8 INSTALLATION PROCEDURE 10 PERIODIC CHECKS AND ROUTINE MAINTENANCE 10 RENEWAL PARTS 11 TYPE NBVllA GE Protection and...

Page 2: ...V11A Relay Top View Showing Location of Parts Referred to in Text TELEPHONE RELAY RESISTOR Rl RESISTOR R2 DIODE RECTIFIER BRIDGE Figure 2 8031804 Type NBVl1A Relay Left Side View Figure 3 8031803 Type...

Page 3: ...phase condition on light load as well as on heavy load The NBV is usually connected to a bus and it will effectively protect a group of many motors when the open circuit is between the source and the...

Page 4: ...l define the relay pickup voltage VR as the single phase voltage that when connected to the relay as shown in Figure 10 will just cause the relay to pick up This will be between 10 and 20 volts for th...

Page 5: ...otential transformers are connected in open delta as shown in Figure 6 B the burden is as shown in Table III For the best division of burden it is recormnended that terminal No 6 of the relay be conne...

Page 6: ...ages seen by the relay are the same as the relay would see if it were connected to a three phase system that had one phase shorted Thus if we assume v12 is shorted then in equation 1 V1 2 0 v2 3 v2 3...

Page 7: ...e front of the relay case contains an interlock arm that prevents the cover from being put back in place until the connection plugs have been inserted The relay case is suitable for either semi flush...

Page 8: ...With the telephone type relay de energized each normally open contact should have a gap of 010 015 inch Observe the wipe on each normally closed contact by deflecting the stationary contact member to...

Page 9: ...ave should decrease Continue increasing resistor R1 until the minimum voltage occurs As the magnitude of the wave decreases it will be due to the fundamental wave decreasing The harmonic content of th...

Page 10: ...y changing the Resistor R2 setting PERIODIC CHECKS AND ROUTINE MAIRTENANCE In view of the vital role of protective relays in the operation of a power system it is important that a periodic test progra...

Page 11: ...equired RENEWAL PARTS Sufficient quantities of renewal parts should be kept n stock for the prompt replacement of any that are worn broken or damaged When ordering renewal parts address the nearest Sa...

Page 12: ...A0254 Potential Transformer Connections for Type NBV11A Relay 0418A0807 2 Test Connections for Checking R C Circuit Adjustment 0418A0805 Internal Connections for Type NBV11A Relay Front View 0459A0252...

Page 13: ...tt tt r 4 Jt r _ h tt R H H d i t 1 GEI 50261 1 1 ttt t ft i i 1 i t 0 0 0 0 0 t N i Figure 4 SONOJ3Silll Nl 3 11 0459A0251 Operating Times of Type NBVllA Relay Contacts When Unbalanced Voltage Is Su...

Page 14: ...t 1 H 1 0 r M h _4j 1 t tl t i t _ 0 1 0 M _ i t t t r c c I I f c t t tf t _ t t j I fhl l0fi W 1 0 N M SONOJ3Sill1Vi t _ _ t 7 t o t l 1 0 0 M Nl Vi 11 _J_ 1 1 1 t T rq I tt i 0 Figure 5 0459A0250 O...

Page 15: ...NECTION FOR WYE CONNECTED P T S l 5 i L 1 0 6 B P T SECONDARIES 7 RELAY S1UDS RECOMMENDED CONNECTION FOR OPEN DELTA P T S Figure 6 0459A0254 Potential Transformer Connections for Type NBVllA Relay 15...

Page 16: ...GEI 50261 1 t l RATED VOLTAGE 3 FREQUENCY 2 2 3 1 3 9 10 Figure 7 0418A0807 2 Test Connections for Checking R C Circuit Adjustment 16 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 17: ...GEI 50261 TR I l i 5 7 6 I I I 111 112 fl j AUTo TRANSFORMER r 9 8 TR 10 x SHORT F I NGER Figure 8 0418A0805 Internal Connections for Type NBVllA Relay Front View 17 w w w E l e c t r i c a l P a r t...

Page 18: ...IONS VT 2 b UNBALANCED BY SHIFT OF ONE CORNER c UNBALANCED BY SHIFTING TWO CORNERS b TOWARD EACH OTHER ALONG VECTOR BETWEEN THEM 2 Figure 9 0459A0252 1 System Voltages under Balanced and Unbalanced Co...

Page 19: ...C VARIAC GEI 50261 1 2 4 6 9 COAITI VVITY LIGHT 10 W 7H VOLTA SOVI CI Figure 10 0459A0223 2 Test Connections for Setting Pickup of Type NBV11A Relay 19 w w w E l e c t r i c a l P a r t M a n u a l s...

Page 20: ...AF TER ENGAGING AUXILIARY B RUSH CONNECTING PLUG TRAVELS Y4 INCH BEFORE ENGAGING THE MAIN BRUSH ON THE TERMINAL B LOCK Figure 11 8025039 Cross Section of Drawout Case Showing Position of Auxiliary Br...

Page 21: ...60X0 0003 T SI TARGET 1 SEAL IN T D C TIME DELAY CLOS lNG F RA IC FILTER OtS5AS788 I I I I I I I 1 I I PT S I I J I I I j _J_ I J _ II _____ _ WHEII USED r l J o F _ J I 7 5 FUSES IF U f D AUX PT I I...

Page 22: ...8 6 4 2 L 29MM I 6 187 1 9MM 3 0 I 157MM 76MM 4 I II I I 4 406 l 112MM I _i_ CUTUUT 8 81 I 224M III 2 843 f 2 M 72MM 1 218 f t ____ 5MM 5 687 PANEL I I II 144MM 5 25 BACK VIEW DRILLED HOLES 1 156 29M...

Page 23: ...I il e I oc3ood 0 0 OG2 GEI 50261 BACK VIEW OF CASE Figure 14 0178A5824 1 Outline and Mounting Dimensions for the Harmonic Filter 23 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 24: ...3 94 200 Protection and Control GE Technology Center 205 Great Valley Parkway Malvern Pennsylvania 19355 1337 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...

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