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KLF Loss-of-Field Relay

41-748P

15

Figure 7: KLF Frequency Response for 60 Hertz Impedance Unit

Figure 8: Typical Machine Capacity Curves Plotted on a Per Unit kVA basis

(183,500 kVA, 45# H2, 18 kV, 0.9 pt, 0.64 SRC, inner-cooled, 3600 rpm.)

Sub 2
3491A08

*Sub 3
185A183

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Summary of Contents for KLF

Page 1: ...e unit with adjustable resistor telephone relay and an ICS indi cating contactor switch 2 1 COMPENSATOR The compensators which are designated TA and TC are two winding air gap transformers Figure 10 page 21 The primary or current winding of the lon greach compensator TA has seven taps which termi nate at the tap block They are taps which terminate at the tap block They are marked 2 3 3 16 4 35 5 9...

Page 2: ... Figure 1 Type KLF Relay Photo 9664A65 RV Directional Unit Reversing Links Impedance Unit Undervoltage Unit XD Resistor for X Unit X Unit ICS Front View elephone elay Rear View CB Capacitors CD Reactor T TC TA SA SC CV RB Photo 9664A66 ...

Page 3: ...he moving contact will make the arm slip from the condition of reset to the point where the clamp projection begins to ride up on the wedge The free travel can vary between 15 and 20 The shaft has removable top and bottom jewel bear ing The shaft rides between the bottom pin bearing and the upper pin bearing with the cylinder rotating in an air gap formed by the electromagnet and the mag netic cor...

Page 4: ...g the trip circuit Also during this operation two fingers on the arma ture deflect a spring located on the front of the switch which allows the operation indicator target to drop The target is reset from the outside of the case by a push rod located at the bottom of the cover The front spring in addition to holding the target pro vides restraint for the armature and thus controls the pickup of the...

Page 5: ...KLF Loss of Field Relay 41 748P 5 Figure 2 Internal Schematic of Type KLF Relay in FT 41 Case Sub 10 184A958 ...

Page 6: ...41 748P KLF Loss of Field Relay 6 Figure 3 External Schematic of Type KLF Relay Figure 4 Generalized External Schematic Sub 12 290B607 Sub 3 3491A03 ...

Page 7: ...n Figure 12 C how VPOL is reversed by the ZC compensation In this case the ZA compensation has no effect on the balance point This explains why the reach point is fixed independently by ZC Figure 12 assumes that ZC is positive circle includes origin If the current coil link is reversed the com pensation becomes 1 5 IA ZC In Figure 12 B this change would result in VPOL being reduced rather than inc...

Page 8: ...gs and relative advan tages of these various configurations are summa rized in Table 1 page 9 The single zone and two zone setting recommenda tions are modified when two or more machines are bussed at the machine terminals The voltage and time delay considerations are treated in detail in other sections of this leaflet The recommended set tings are outlined in Table 2 page 9 5 2 ZONE 2 SETTING CAL...

Page 9: ...e to LOF condition 2 Can operate on partial LOF 3 Provide alarm features for manual operation 1 Same as 1 2 and 3 at left 2 Provides back up protection Table 2 Special Settings for Multi Machines Bussed at Machine Terminals Zone 1 Alone Zone 2 Alone Both Zone 1 and Zone 2 IMPEDANCE SETTING See Figure 5 See Figure 6 See Figures 5 6 VOLTAGE SETTING a Contact shorted or b Set at 87 for security 87 Zo...

Page 10: ...A per unit X Zbase 3 ZC ZC per unit X Zbase 2R ZA X Zbase 4 where R radius of circle in per unit The tap plate settings are made according to equations 5 where T compensator tap value S autotransformer primary tap M autotransformer secondary tap value M is a per unit value determined by taking the sum of the values between the L and the R leads The sign is positive when L is above R and acts to lo...

Page 11: ...KLF Loss of Field Relay 41 748P 11 Figure 5 Zone 1 Impedance Characteristic Figure 6 Zone 2 Impedance Characteristic Sub 3 3491A03 Sub 3 3491A03 ...

Page 12: ...ted to the same bus loss of field of one unit may not depress the bus voltage to the point where the undervoltage unit will operate if it has the standard setting The following recommenda tions should be considered 1 For cross compound turbine generator appli cations the dropout voltage i e the voltage at which the back contact of the undervolt age unit closes of the undervoltage unit should be se...

Page 13: ...KLF impedance circle should be small and fully offset in the nega tive reactance region The long reach should be set above synchronous reactance Xd The short reach should be set equal to one half transient reactance Xd 2 The trip circuit should be energized directly with no time delay The alarm circuit should operate a timer which may be set from 0 25 to 1 0 sec onds depending on user preference I...

Page 14: ...s 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 of the numbers that are crossed when going from the R lead position to the L lead position The sign of the M value is determined by which lead is in the higher position on the tap plate The sign is posi tive if the L lead is higher and negative if the R lead is higher An M setting may be made in...

Page 15: ...48P 15 Figure 7 KLF Frequency Response for 60 Hertz Impedance Unit Figure 8 Typical Machine Capacity Curves Plotted on a Per Unit kVA basis 183 500 kVA 45 H2 18 kV 0 9 pt 0 64 SRC inner cooled 3600 rpm Sub 2 3491A08 Sub 3 185A183 ...

Page 16: ...minal voltage at 80 volts increase current until contacts just close This current should be within 3 of 2 25 amp 2 32 2 18 amp This value corre sponds to 1 5ZA setting since the voltage is applied to terminals 4 and 5 is equivalent to 1 5 VIN voltage or 4 Adjust phase shifter for 90 current leading the voltage 5 With the terminal voltage at 80 volts increase current until contacts just close This ...

Page 17: ...ad should be connected to the 0 insert R lead should be connected to the upper 06 insert 03 06 06 15 between L and R For the most accurate calibration preheat relay for at least an hour by energizing terminals 5 6 7 with 120 volts 3 phase The links in the middle tap block should be set for the TC direction vertical 1 Contact Gap Adjustment The spring type pressure clamp holding the sta tionary con...

Page 18: ... should not be loosened prior to rotating the spring adjuster The adjust ment of the spring is accomplished by rotating the spring adjuster which is located on the under side of the bridge The spring adjuster has a notched periphery so that a tool may be used to rotate it 3 Plug adjustment for reversing of spurious torques a Set TC 0 0 Connect a heavy current lead from TA center link to terminal 8...

Page 19: ... the telephone relay coil is shorted This may be done by manually closing the impedance unit Z and direc tional unit D contacts H Compensator Check Accuracy of the mutual impedance T of the compen sators is set within very close tolerances at factory and should not change under normal conditions The mutual impedance of the compensators can be checked with accurate instruments by the procedure outl...

Page 20: ...41 748P KLF Loss of Field Relay 20 Figure 9 Typical Machine Capability Curves and Sample KLF Setting Sub 2 185A184 ...

Page 21: ...KLF Loss of Field Relay 41 748P 21 Figure 11 R X Diagram Characteristics with Various ZC Compensator Settings Sub 2 185A182 Figure 10 Compensator Construction Sub 1 185A181 ...

Page 22: ...41 748P KLF Loss of Field Relay 22 Figure 12 Effect of Compensator Voltages ZC is positive Sub 3 185A331 ...

Page 23: ...KLF Loss of Field Relay 41 748P 23 Figure 13 Diagram of Test Connections for KLF Relay Sub 5 290B580 ...

Page 24: ... Coral Ridge Drive Coral Springs Florida 33065 TEL 954 752 6700 FAX 954 345 5329 41 748P KLF Loss of Field Relay ABB Automation Inc Figure 14 Outline and Drilling Plan for the Type KLF Relay in the FT 41 Case Sub 18 57D7904 ...

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