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ABB KD-10 Instruction Leaflet
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ABB KD-10 Instruction Leaflet

ABB KD-10 Instruction Leaflet

Compensator distance relay
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Summary of Contents for ABB KD-10

  • Page 2 I.L. 41-490H transformers with two primary current windings. between the R and L lead. The actual per unit values Each primary current winding has seven taps which which appear on the tap plate between taps are 0, terminate at the tap block (Figure 3). They are .03, .09 and .06.

  • Page 3: Operation

    One connection uses an auxiliary 5:5 ratio The main contact of KD-10 and KD-11 relays will current transformer to insert the -31 component.
  • Page 4 X-Y-Z triangle also tends to be zero un- produce restraining torque. der these conditions. A memory circuit in the KD-10 For a fault at B , the currents are larger than for a fault relay provides momentary operating torque under at A , so that compensator voltages are larger.
  • Page 5 Pick up current is proportionately jects the cylinder unit to a similar set of conditions. higher in S=2 and S=3 taps. The KD-10 relay may be set without regard to possi- CHARACTERISTICS ble overreach due to dc transients. Compensators...
  • Page 6 ------- - amperes The .2–4.5 ohms range KD-11 relays have no over- reach regardless of the tap being used. The maxi- The KD-10 relay may be set without regard to possi- ° mum torque angle will stay constant at 60 .
  • Page 7 Operating Time The phase-to-phase potential rating is 120 Vac ±10%. The speed of operation for the KD-10 relay three-phase and phase-to-phase units is shown by Impedance settings in ohms reach can be made for the time curves in Figure 14. The curves indicate the...

  • Page 8: Setting Calculations

    The relay tap plate setting, Z, is set according to the Figure 17 and Figure 18 for the KD-10 and KD-11 re- following Equation: lays respectively. The potential burden and burden...
  • Page 9 Application of the Relay to the Lines to be Protected. –————–—| Example 1 |———–——— a. For Zone 1 application of KD-10 relays no setting or calibration correction should be made if the line Step 1 ___________________________________ angle is 65 degrees or higher for the medium and °...

  • Page 10: Setting The Relay

    I.L. 41-490H 6.2.2 For Short Range Relay T = .690 (.2 - 4.5 ohms) M = +.12 S = 1 Zone 1 application for line angles below 50, recali- brate the phase-to-phase unit to maximum torque NOTE: If for some reasons an exact correction °...

  • Page 11: Installation

    I.L. 41-490H The KD-10 and KD-11 relays require settings for a small hole, one on each side of the vertical row of each of the three compensators (T, T , and T “M” tap inserts. The lead connectors are held in place on the proper tap by connector screws.

  • Page 12: External Connections

    11. ACCEPTANCE TESTS use of a 15/5 auxiliary current transformer so that the CT neutral may be formed elsewhere. KD-10 and KD-11 relays have a very small number of moving parts which might become inoperative. Ac connections for additional applications are shown Acceptance tests in general consist of: in Figures 20, 21, 22 and 23.
  • Page 13 I.L. 41-490H TABLE I RELAY SETTINGS FOR KD-10 & KD-11 RELAYS (.2 - 4.5 OHMS) S = 1 S = 2 S = 3 LEAD CONNECTION ∆ “L” “T” .230 .307 .383 .537 .690 .920 1.23 .920 1.23 1.23 Lead Lead .195...
  • Page 14 I.L. 41-490H TABLE II RELAY SETTINGS FOR KD-10 & KD-11 (0.75 - 21.2) LEAD S = 1 S = 2 S = 3 “M” CONNECTION ∆ “L” “R” Lead Lead 1.16 1.45 2.03 4.06 4.06 4.06 .737 1.23 1.72 2.46 3.44...
  • Page 15 I.L. 41-490H TABLE III RELAY SETTINGS FOR KD-10 & KD-11 RELAYS (1.3 - 36.6) LEAD S = 1 S = 2 S = 3 “M” CONNECTION ∆ 3.51 7.02 10.0 7.02 7.02 1.27 1.69 2.12 2.97 4.24 5.94 8.47 16.9 25.4...
  • Page 16 I.L. 41-490H At any other angle α, relay reach is Make sure that correct lead-lag reference is estab- lished. Once the phase-shifter is calibrated, remove θ α (18) – θ the wattmeter from the circuit. Make all phase angle reading from phase-shifter scale. This method elimi- where Z θ...
  • Page 17 I.L. 41-490H 3-phase unit to operate between 10.5 - 12.7 am- The current required to close contacts of the top peres. unit should be: Use Equations (16) and (17) to estimate test current, Range .2 - 4.5 .75 - 21.2 1.3 - 36.6 and allow 5 percent tolerance as explained above.

  • Page 18: Routine Maintenance

    I.L. 41-490H 12. ROUTINE MAINTENANCE Use the following procedure for calibrating the relay if the relay has been taken apart for repairs or the ad- The relays should be inspected periodically, at such justments disturbed. time intervals as may be dictated by experience, to Connect the relay for testing as shown in Figure 25.
  • Page 19 13.4 Distance Unit Calibration floats or restrains very slightly. a. Make the following relay settings: b. KD-10 ONLY: Connect the relay terminals 7 and 8 together and apply rated ac voltage between 7 Relay Range .2 - 4.5 .75 - 21.2...
  • Page 20 Check maximum torque angle using procedure 14.6 Contact Adjustment described below: 14.6.1 KD-10 Relay With moving-contact arm against right-hand back- Relay Range 0.2 - 4.5 .75 - 21.2 1.3 - 3.6 stop, screw the stationary contact in until it just touches the moving contact.
  • Page 21 I.L. 41-490H PHASE-TO-PHASE UNIT (T De-energized, the relay spring should open the con- tacts. Friction in the movement, relay not level, and COMPENSATORS) MAXIMUM electrostatic attraction may contribute to difficulties SENSITIVITY ANGLE ADJUST- in adjusting this point. To avoid these difficulties it is MENT.
  • Page 22 I.L. 41-490H fied limits, then rotate the cylinder unit core 90 de- – A 1F – B 2F – fault grees and repeat test numbers 5, 6, and 7. if V = 120 volts 15.1 Maximum Torque Angle Check = 2 volts fault a.
  • Page 23 I.L. 41-490H b. Use the No. 4 test connection and repeat the pro- For test voltages to be of correct sequence and val- cedure above for checking the T compensator. ues, use the following equation: – 15.2 Spring Restraint fault ------------------------------ - (13) 1 1F...
  • Page 24 I.L. 41-490H 0.2 - 4.5 Ohms Range θ   ∆ 1.5 IT “L” of M ----------------- -   75° .003 - .006 .008 - .016 “L” of M θ   .008 - .011 .018 - .031 2 IT ----------------- - ...

  • Page 25: Current Verification

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This manual is also suitable for:

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