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I.L.

 41-553.1G

and the cover in place, and preferably with the case
mounted on a swtichboard panel. If the relay time
is to be checked from a cold start, the relay should

have been de-energized for several hours
beforehand. If the overload is to be applied follow-
ing a constant load, the current must be main-
tained at the constant initial value until there is no

further change in the moving contact position

before applying the overload. Both the load and
overload currents must be carefully regulated
throughout the test. The relay should not be sub-

jected to drafts or sudden changes in temperature

during the test, as there is some delay in the
response of the temperature compensation. In the
factory calibration the relay is held in a controlled
temperature and other precautions are taken to
minimize factors which would introduce calibra-
tion errors.

The test current should be interrupted as soon

as the contacts close in order to avoid possible
damage to the heaters, particularly when testing at
high values of overload.

RENEWAL PARTS

Repair work can be done most satisfactorily at

the factory. However, interchangeable parts can be

furnished to the customers who are equipped for

doing repair work. Completely assembled and
calibrated thermal elements can be furnished, but

individual parts for the thermal element should not
be ordered since factory fixtures and equipment
are necessary for satisfactory assembly and
calibration. When ordering parts, always give the
complete nameplate data.

ENERGY REQUIREMENTS

The burdens of the heater unit plus the 6-50

ampere instantaneous unit in series at 5 amperes
60 cycles is as follows:

Heater

lap Llnk Continous

Position

Rating

 Amp

 Watt Volt-Amp power Factor

Open 

3.5 

6.25 6.25 

1.0

Closed 

5.0 

3.25 3.25 

1.0

1 7

Courtesy of NationalSwitchgear.com

Содержание BL-1

Страница 1: ...plications However the drop across a portion of the protected circuit such as the interpole field win ding of a machine sometimes can be utilized as a source of energy for the relay CONSTRUCTION AND OPERATION The single element type BL 1 relay consists of a heater unit an instantaneous overcurrent unit 0 two operation indicators and a contactor switch Figures 1 3 The double element type BL 1 relay...

Страница 2: ...Fig 1 Type BL 1 Single Unit Relay without case Front View 2 ...

Страница 3: ...I L 41 553 1G Fig 2 Type BL 1 Double Unit Relay without case Front View 3 Courtesy of NationalSwitchgear com ...

Страница 4: ... currents of short duration The reactor should be removed from the circuit for dc application This is readily accomplished by removing the heavier lead from the two left hand terminals of each thermal unit enclosure of the internal spring will cause it to res pond more slowly than the external spring and a temporary change in contact position would result from a large and rapid change in ambient t...

Страница 5: ... is a small solenoid type switch A cylindrical plunger with a silver disc mounted on its lower end moves in the core of the solenoid As the plunger travels up ward the disc bridges three stationary contacts The coil is in series with the main contacts of the relay and with the trip coil of the breaker When the relay contacts close the coil becomes energized and closes the switch contacts This shun...

Страница 6: ...TACT REACHES FINAL POSITION FOR INITIAL STEADY LOAD INDICATED BELOW ZERO CURRENT INTERNAL TEMP AT APPROX AMBIENT TEMP 70 OF 3 5 AMPS 100 OF 3 5 AMPS V 1 5 1 1 1 1 l i I I I I 1 1 HT V 1 1 1 I I V i T u I I i I l I I I 1 r I I 1 1 X m 9 v 8 V XT T 7 m 6 V p a 5 i m A 1 m X 4 X p jz H t PI A 3 T X7 i V x x 2 I m r r f i 1 i s u s I 1 1 1 1 L 1 i I I I I I I i K J 1 i I i I I I U 1 I I i I k I i I 1 ...

Страница 7: ...OAD APPLIED AFTER MOVING CONTACT REACHES FINAL POSITION FOR INITIAL STEADY LOAD INDICATED BELOW ZERO CURRENT INTERNAL TEMP AT APPROX AMBIENT TEMP 70 OF 5 AMPS 100 OF 5 AMPS l T T i i i V I M V I 1 v J jOk X 9 8 PI 7 J 6 I z4 v 5 7 5 fK 5 V 4 I X 3 Tx X X I iz i ri w i ES i 2 v r 7 i_L l v L C 1 n f LLU i A 1 1 1 1 I 093 MIN AT 1000 L s i i 1 100 200 300 400 500 600 700 800 900 1000 PERCENT OF POIN...

Страница 8: ... I I i I 1 X T j yY T V 4 9 rr 8 is 3 FOR 2 75 AMP SETTING FOR 3 75 AMP SETTING WHEN STARTING FROM 100J OF FULL LOAD CURRENT 6 51 5 5 Y rt Y 5 Y 5r V L 5 1 X Y T j 3 r i K IT 2 1 I i l J i 075 MIN AT 1000J 1 r 100 200 300 400 500 600 700 800 900 1000 PERCENT OF FULL LOAD CURRENT 396063 Curve Fig 7 Current T ime Curves for Special Applications of the Type BL 1 Relay covering Range of F ull Load Cur...

Страница 9: ...pe BL 1 Relay Covering Range of Fufl Load Currents from 4 0 to 5 0 Amperes Contact Settings Determined by Test for 15 Minute Delay with 125 Load Occurring after Moving Contact reaches Final Position for Steady Full Load Shorting Link Closed 9 Courtesy of NationalSwitchgear com ...

Страница 10: ...Fig 9 Contact Opening and Reset Time Curves for the Type BL 1 Reioy for Fult Load Settings of 2 5 to 3 5 Amperes os marked on Dial Shorting Link Open 10 Courtesy of NationalSwitchgear com ...

Страница 11: ...L 41 553 1G Contact Opening and Reset Time Curves for the Type BL 1 Relay for Full Load Settings of 3 75 to 5 0 Amperes as marked on Dial Shorting Link Closed Fig 10 11 Courtesy of NationalSwitchgear com ...

Страница 12: ... ampere steps and when the scale pointer is set to one of the indicated current values the relay contacts will close in ap proximately 60 minutes if the current increases to 125 percent of the full load value after the full load current has been flowing long enough for the temperature rise to reach a constant value These curves represent the primary performance re quirements of the type BL 1 relay...

Страница 13: ...of current that will ultimately close the relay contacts but variables such as friction and dis crepancies in calibration prevent precise location of the asymptotic value However after making some allowance for such variables a value of 118 of full load current can be considered as the max imum current that will not produce eventual clos ing of the relay contacts when settings are made as describe...

Страница 14: ...supplied in the type BL 1 relay will pick up at 1 0 ampere direct current For detail information on the FT case refer to I L 41 076 SETTINGS CONTACT RATINGS There are two settings to be made on the relay They are as follows Control Capacity Will Break Control Voltage In Amperes Will Close Unit 1 INSTANTANEOUS UNIT Set the element for a pick up current slightly above the maximum current which the a...

Страница 15: ...lower right posi tion Close switch S1 and pass sufficient dc current through the trip circuit to close the contacts of the ICS This value of current should not be greater than the particular ICS nameplate rating The in dicator target should drop freely Repeat above except to pass 85 of ICS nameplate rating current Contacts should not pick up and target should not drop Open switch S1 when checking ...

Страница 16: ...roximately 16 CONTACTOR SWITCH Adjust the stationary core of the switch for a clearance between the stationary core and the moving core of l 64 when the switch is picked up This can be done by turning the relay up side down or by disconnecting the switch and turning it up side down Then screw up the core screw until the moving core starts rotating Now back off the core screw until the moving core ...

Страница 17: ...minimize factors which would introduce calibra tion errors The test current should be interrupted as soon as the contacts close in order to avoid possible damage to the heaters particularly when testing at high values of overload RENEWAL PARTS Repair work can be done most satisfactorily at the factory However interchangeable parts can be furnished to the customers who are equipped for doing repair...

Страница 18: ... 14 30 _ 5 375 36 53 4 0I6 397 250 _ 6 35 0 f 1 031 f 1 031 4 1 031 t 1 031 H 26 19 26 19 26 19 26 19 1 190 32 SCREW 375 1 344 SPACERS FOR 34 14 THIN PANELS 9 53 R PANEL CASE 1 r A 5 16 18 SCREW FOR THICK PANELS USE 5 16 18 STUDS INTERNAL EXTERNAL TOOTHED WASHERS 190 32 SCREW FOR THICK PANELS USE 190 32 STUDS 594 15 09 1 0 25 4 Li nt 5A 77 3 9 i 1 813 i 2 0 i 46 05 i 50 8 i IOV 2 4 6 8 1 V 516 13 ...

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