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ABB SA-1 Instruction Leaflet

Generator differential relay
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Summary of Contents for ABB SA-1

  • Page 2: Operation

    3.0 OPERATION The amplifier circuit is connected to the sensing cir- The type SA-1 relay is connected to the protected cuit such that it receives the difference in output of apparatus as shown in Figure 5 (page 10). On exter- the restraint filter and the operating filter.

  • Page 3: Installation

    The frequency response characteristic of the Type means of screws. SA-1 relay is shown in Figure 11 (page 15). The external reactor assembly should be mounted and wired per “Interwiring Connection Drawing”, Fig- 5.0 ENERGY REQUIREMENTS...

  • Page 4: Maintenance

    41-348.11C SA-1 Generator Differential Relay - Class 1E 0.2 amperes 60 hertz and reading the voltage drop 1. Minimum Trip Current – Connect the relay per test circuit of Figure 12 (page 15). With switch K across the reactor with a high impedance true rms open, adjust the operating resistor in the rear of reading voltmeter.
  • Page 5 SA-1 Generator Differential Relay - Class 1E 41-348.11C...
  • Page 6 41-348.11C SA-1 Generator Differential Relay - Class 1E Table 1: (Values in Parenthesis Represent Desensitized SA-1) CHECKPOINTS (TYPICAL VALUE) PRIMARY CIRCUIT CURRENT PHASE TERMINAL VALUE FUNCTION 0.14A 2 - 7 2.5 ac Input to operate rectifier Operating 3 - 6 2.5 ac...
  • Page 7 SA-1 Generator Differential Relay - Class 1E 41-348.11C Table 2: Electrical Parts List CIRCUIT SYMBOL REFERENCE STYLE Resistors UT, UM, UB 60 Ohms, 25W 1875676 Resistors LT, LM, LB 265 Ohms, 25W 1725542 Resistors 1.8K, 40W 187A321H06 Zener IN2986B 629A798H03...
  • Page 8 41-348.11C SA-1 Generator Differential Relay - Class 1E *Sub 9 3520A40 Figure 3. Internal Schematic of Type SA-1 Relay in Type FT-32 Case 48/125 Vdc...
  • Page 9 SA-1 Generator Differential Relay - Class 1E 41-348.11C Sub 3 3525A93 Figure 4. Component Location on Printed Circuit Board Type SA-1 Relay 48/125 Vdc...
  • Page 10 41-348.11C SA-1 Generator Differential Relay - Class 1E Sub 4 775B965 Figure 5. External Schematic of Type SA-1 Relay for Generator Protection Sub 1 775B982 Figure 6. Reactor Outline...
  • Page 11 SA-1 Generator Differential Relay - Class 1E 41-348.11C NOTE: A - PLACE IT. 1 TO 3 IN IT. 5 FOR SHIPPING PART STYLE ITEM NOTE ENG. NAME DWG. CODE REF. SCREW SIZE Lead LEAD 57Z0301 63-D-653 LEAD 57Z0401 63-D-655 3.00 .164 - 32...
  • Page 12 41-348.11C SA-1 Generator Differential Relay - Class 1E Sub 2 3537A44 Figure 8. Percentage Slope Characteristic at Low Value of Restraint Current...
  • Page 13 SA-1 Generator Differential Relay - Class 1E 41-348.11C Sub 3 878A742 Figure 9. Percentage Slope Characteristic at High Value of Restraint Current...
  • Page 14 41-348.11C SA-1 Generator Differential Relay - Class 1E 471106 Figure 10. Typical Operation Time Characteristic...
  • Page 15 SA-1 Generator Differential Relay - Class 1E 41-348.11C Sub 2 3537A45 Figure 11. Typical Frequency Response Curve Sub 6 184A864 Figure 12. Test Diagram for Type SA-1 Relay...