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41-748.31B

24

KLF-1 Loss-of-Field Relay

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Summary of Contents for KLF-1

Page 1: ......

Page 2: ...ylinder unit is composed of four basic components A die cast aluminum frame an electromagnet a moving element assembly and a molded bridge The frame serves as a mounting structure for the magnetic core The magnetic core which houses the lower pin bearing is secured to the frame by a locking nut The bearing can be replaced if necessary without having to remove the magnetic core from the frame The e...

Page 3: ...t Mechanically the voltage unit is composed like the directional unit of four components A die cast alumi num frame an electromagnet a moving element assembly and a molded bridge The electromagnet has two pairs of voltage coils Each pair of diametrically opposed coils is connected in series In addition one pair is in series with an adjustable series resistor These sets are in parallel as shown in ...

Page 4: ...With the reversing links in the normal posi tion ZC the circle includes the origin with the opposite link position ZC the circle misses the origin The following paragraphs explain this com pensator action Referring to Figure 6 page 23 note that XC and CC cause the polarizing voltage to be shifted 90 in the leading direction Thus when the current is zero polarizing voltage VPOL leads the operating ...

Page 5: ...L RATINGS Potential 75 volts L N continuous for relays rated 69 Vac 132 volts L N continuous for relays rated 120 Vac Current 8 amperes continuous 200 amperes for 1 second 5 0 SETTING CALCULATIONS 5 1 GENERAL SETTING RECOMMENDATIONS The KLF 1 relay may be applied as a single zone device or two relays may be used to provide two zone protection The single zone setting may be fully offset Zone 1 or m...

Page 6: ...plot conversion is as shown in Figure 8 page 23 Continue this process with other points from curves such as those of Figure 7 page 23 until a complete curve like that of Figure 8 page 23 is obtained After plotting the steady state stability limit and the machine capability curves on the R X diagram plot the impedance unit circle between the stability limit and the capability curve Note in Figure 8...

Page 7: ...arest to 13 8 is TA 15 8 Set TA in 15 8 tap Step 3 1 145 1 145 Set M 15 Place R lead in 0 L lead in upper 06 The relay setting is now Actual This is 99 7 of the desired setting To set ZC 3 29 ohms Step 1 The lowest SC tap for 6SC greater than 3 29 is SC 1 Set SC 1 Step 2 TC nearest to Set TC in 3 64 tap Step 3 1 107 1 107 Hence the nearest MC value is 12 Now set R lead in 0 03 tap and L lead in th...

Page 8: ... safe volt age for system stability NOTE An electrical check of this particular set ting is outlined in this instruction leaflet under the heading Acceptance Check 6 0 TIME DELAY CONSIDERATIONS It may be conservatively stated that the rotor struc ture and stator heating as a result of a shorted field can be tolerated for 10 seconds on a conduc tor cooled machine and 25 seconds for a conven tional ...

Page 9: ...rmers primaries SA and SC and for the undervoltage unit Table 1 RECOMMENDED SETTINGS FOR KLF 1 RELAY ZONE 1 ALONE ZONE 2 ALONE BOTH ZONE 1 ZONE 2 IMPEDANCE SETTING See Figure 11 page 25 See Figure 12 page 26 See Figure 11 12 VOLTAGE SETTING a Contact shorted or b Set at 80 for security 80 Zone 1 voltage contact shorted with Zone 2 set at 80 TD 1 1 4 to 1 sec 1 sec preferred 1 4 to 1 sec 1 sec pref...

Page 10: ...C Secondary tap connections are made through two leads identified as L and R for each transformer These leads come out of the tap plate each through a small hole one on each side of the vertical row of M tap inserts The lead connectors are held in place on the proper tap by connector screws Values for which an M setting can be made are from 15 to 15 in steps of 03 The value of a setting is the sum...

Page 11: ...ntacts just close This current should be within 3 of 17 9 amps 17 3 18 5 amps Contact Gap The gap between the station ary contact and moving contact with the relay in de energized position should be approximately 040 B Directional Unit Circuit D 1 Connect the relay as shown in Figure 9 page 24 with the switch in position 1 and the trip circuit de energized 2 With a terminal voltage of 1 volt and 5...

Page 12: ...uld be connected 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 terminals 4 5 6 7 with 70 volts phase to neutral or terminals 5 6 7 with 3 phase 120 volts phase to phase voltages The links in the middle tap block should be set for the TC direction vertical 1 Contact Gap Adj...

Page 13: ... 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 angles where the moving contacts just close These two angles where torque reverses should be where the current leads the voltage by 313 4 and 133 4 Readjust the bottom resistor located in the rear for correct read ing 4 Sensitivity Adjustment A...

Page 14: ...pe 1 64 to 3 64 when the armature is against the core 2 Target Manually raise the moving contacts and check to see that the target drops at the same time as the contacts make or up to 1 16 ahead The cover may be removed and the tab holding the target reformed slightly if necessary However care should be exer cised so that the target will not drop with a slight jar 3 Pickup The unit should pickup a...

Page 15: ...his setting corresponds to ZA 23 7 and ZC 2 80 ohms Adjust the phase shifter for 90 current lag ging the voltage 3 With the terminal voltage at 90 volts increase current until contacts just close This current should be within 3 of 3 80 amp 3 686 3 914 amp 4 Adjust phase shifter for 90 current leading the voltage 5 With the terminal voltage at 90 volts increase current until contacts just close Thi...

Page 16: ...d be followed for taps 1 and 2 of SC 2 Set SA and SC on Tap 1 and adjust the volt age at the relay terminals for 100 volts Mea sure voltage drop from terminals 5 to each of the MA and MC taps This voltage should be equal to 100 1 plus the sum of values between R and tap being measured Exam ple 100 1 03 06 109 volts Transformers that have an output different from nominal by more than 1 0 volt proba...

Page 17: ...now be 1 20 1 28 amp D Directional Unit Top Unit 1 Contact Gap Adjustment The spring type pressure clamp holding the stationary contact in position should not be loosened to make the necessary gap adjust ments With moving contact in the open position i e against right stop on bridge screw in stationary contact until both contacts just make Then screw the stationary contact away from the moving con...

Page 18: ...ed with 91 or more volts The spring should not be used for this setting F Indicating Contactor Switch ICS Initially adjust unit on the pedestal so that arma ture fingers do not touch the yoke in the reset position Viewed from top of switch between cover and frame This can be done by loosening the mounting screw in the molded pedestal and moving the ICS in the downward position 1 Contact Wipe Adjus...

Page 19: ...ections MA and MC 3 Pass 10 amperes ac current in terminal 9 and out of terminal 8 4 Measure the compensator voltage with an accurate high resistance voltmeter 5000 ohms volt 5 Compensator A voltage should be checked between lead LA and terminal 5 a For TA 15 8 the voltage measured should be 158 volts 3 6 Compensator C voltage should be checked between lead LC and the front terminal of the reactor...

Page 20: ...Class 1 E Relay Directional Unit TA Tap Plate Impedance Unit UnderVoltage Unit ICS RB TA Compensator TA Autotransformer RV Directional Unit Maximum Torque Angle Adjustment TC Compensator TC Autotransformer TC Tap Plate Front View Rear View Telephone Relay X Unit ...

Page 21: ...41 748 31B 21 KLF 1 Loss of Field Relay Figure 2 Compensator Construction Figure 3 Internal Schematic of Type KLF 1 Relay in FT41 Case 185A181 Sub 1 3531A60 Sub 5 ...

Page 22: ...41 748 31B 22 KLF 1 Loss of Field Relay Figure 4 External Schematic of Type KLF 1 Relay 1505B95 Sub 1 ...

Page 23: ...nsator Voltage ZC is positive 185A182 Sub 2 Figure 8 Typical Machine Capability Curves and Sample KLF 1 Settings Per Unit Impedance 185A184 Sub 2 Figure 7 Typical Machine Capacity Curves Plotted on a Per Unit Basis 183 500 kVA 45 H2 18 KV 0 9 pf 0 64 SCR inner cooled 3600 rpm 185A183 Sub 3 188A320 Sub 2 Denotes change since previous issue ...

Page 24: ...41 748 31B 24 KLF 1 Loss of Field Relay Figure 9 Diagram of Test Connections for KLF 1 Relay 1505B94 Sub 1 ...

Page 25: ...41 748 31B 25 KLF 1 Loss of Field Relay Figure 10 Generalized External Schematic Figure 11 Zone 1 Impedance Characteristic 3533A32 3533A32 Sub 3 Sub 3 ...

Page 26: ...41 748 31B 26 KLF 1 Loss of Field Relay Figure 12 Zone 2 Impedance Characteristic Figure 13 KLF 1 Frequency Response For Impedance Unit For 60 Hz Relay 3335A32 3491A09 Sub 3 Sub 2 ...

Page 27: ...41 748 31B 27 KLF 1 Loss of Field Relay Figure 14 Relay Type KLF 1 Time Delay Schematic for Class 1E Application 3533A29 Sub 4 ...

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