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I.L. 41-748.1F

2

Figure 1. Type KFL-1 Relay

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Содержание KLF-1

Страница 1: ...due to inadvert ent loss of potential such as due to a blown potential fuse On circuits with 3 phase 3 wire connected volt age transformers the type KLF relay is used 2 CONSTRUCTION The relay consists...

Страница 2: ...I L 41 748 1F 2 Figure 1 Type KFL 1 Relay...

Страница 3: ...e the magnetic core from the frame The electromagnet has two sets of two series con nected coils mounted diametrically opposite one another to excite each set of poles Locating pins on the electromagn...

Страница 4: ...is attached to the moving contact arm by a spiral spring The spring adjuster is also held in place by a spring type clamp When contacts close the electrical connection is made through the stationary...

Страница 5: ...ses the moving con tacts bridge two stationary contacts completing the trip circuit Also during this operation two fingers on the armature deflect a spring located on the front of the switch which all...

Страница 6: ...ly by ZC Figure 6 assumes that ZC is positive circle includes origin If the current coil link is reversed the compensation becomes ZC In figure 6 b this change would result in VPOL being reduced rathe...

Страница 7: ...the range of 60 to 100 percent of normal system voltage The actual range of adjustment is 40 to 70 VL N The dropout ratio of the unit is 98 percent or higher 4 4 TRIP CIRCUIT The main contacts will sa...

Страница 8: ...igure 8 After plotting the steady state stability limit and the machine capability curves on the R X diagram plot the relay circle between the stability limit and the capability curve Note in figure 8...

Страница 9: ...value S auto transformer primary tap value M auto transformer secondary tap value M is a per unit value determined by taking the sum of the values between the L and R leads The sign is positive when L...

Страница 10: ...R lead in 0 03 tap and L lead in the upper 06 tap Since MC has plus sign lead L must be over R Then ohms or 98 of the desired value 5 3 UNDERVOLTAGE UNIT The undervoltage unit is usually set to a val...

Страница 11: ...are applica tions where an external timer would be desirable 1 Cross compound units with undervoltage unit setting of 58 volts should use an exter nal timer to assure tripping before thermal damage ca...

Страница 12: ...Since the link and connector screws carry operating current be sure that the screws are turned to bind snugly Compensator TC requires an additional setting for including or excluding the origin of R...

Страница 13: ...er 06 03 0 0 Lower 06 0 03 0 0 03 0 Lower 06 0 0 03 Upper 06 Lower 06 Upper 06 Upper 06 Table 1 RECOMMENDED SETTINGS FOR KLF RELAY ZONE 1 ALONE ZONE 2 ALONE BOTH ZONE 1 ZONE 2 IMPEDANCE SETTING See Fi...

Страница 14: ...I L 41 748 1F 14 NEG DC Figure 10 Generalized External Schematic Figure 11 Zone 1 Impedance Characteristic 3491A03 3491A03...

Страница 15: ...I L 41 748 1F 15 Figure 12 Zone 2 Impedance Characteristic Figure 13 KLF 1 Frequency Response for Impedance Unit 3491A03 3491A09...

Страница 16: ...se shifter for 90 current lag ging the voltage 3 With the terminal voltage at 50 volts increase current until contacts just close This current should be within 3 of 2 11 amp 2 20 2 05 amp 4 Adjust pha...

Страница 17: ...ted to the 0 insert R lead should be connected to the upper 06 insert 03 06 06 15 between L R For the most accurate calibration preheat relay for at least an hour by energizing termi nals 4 5 6 7 with...

Страница 18: ...p of 22 2 With relay deenergized adjust the restraint spring so that contact arm just floats 3 Maximum Torque Angle Check With 50 volts and 5 amperes applied vary the phase shifter to obtain the two a...

Страница 19: ...d not be greater than the particular ICS tap settings being used The indicator target should drop freely G Telephone Relay Energize the telephone relay circuit terminals 10 and 3 with rated dc voltage...

Страница 20: ...ompany Inc 4300 Coral Ridge Drive Coral Springs Florida 33065 TEL 954 752 6700 FAX 954 345 5329 I L 41 748 1F Figure 14 Outline and Drilling Plan for the Type KLF 1 Relay in the FT 41 Case 57D7904 Den...

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