CH 21 RELAYS ONLY PDF
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Summary
This document details different types of relays, including metal to carbon live relays, AC immunized relays, track relays, timer relays and metal to metal relays. The document also features various types of group relays, non AC immunized neutral relays, interlocked relays, and includes details about AC immunized relays with both top and bottom immunity. It also discusses miscellaneous metal to metal relays, including double coil relays, universal ECRs, and different WKR types. The document also details specifications for Siemens motorised clockwise timers, and ECRs relays, including their pick-up and drop-away currents and withstand continuous currents.
Full Transcript
# SEM Chapter-21 ## Topic = Relays ### Q-Series Relay #### 1. Metal to Carbon Live Relay (Non-Ac Line Relay) - 6953 - QNNI - QNA1 - QBAI - QBCA-1 - OSPA-1 - Q1-1 #### 2. Metal to Carbon Live Relay (Ac Immunised Relays) - Ac immunized DC neutral Line Relay - QNA-1 Relay - QBAI Relay - QBCA-...
# SEM Chapter-21 ## Topic = Relays ### Q-Series Relay #### 1. Metal to Carbon Live Relay (Non-Ac Line Relay) - 6953 - QNNI - QNA1 - QBAI - QBCA-1 - OSPA-1 - Q1-1 #### 2. Metal to Carbon Live Relay (Ac Immunised Relays) - Ac immunized DC neutral Line Relay - QNA-1 Relay - QBAI Relay - QBCA-1 Relay - OSPA-1 Relay - Q1-1 Relay #### 3. Track Relay - QT2 - QTA 2 - QBAT #### 4. Timer Relay - DC Thermal (COJI) - Electronic ### Siemens Metal to Metal Relays #### 1. K-50 Relays - Mini: (2) - Minor (15) - Major (30, use in RRT) * Minor = one interlocked replacing two neutral * Minor = one contractor replacing 1 neutral * Minor = one resister = one neutral * Minor = one capacitor = one neutral #### 2. Group Relay - 2 aspect signal - 3 aspect signal - Shunt - Universal Route - Point Group - laivet chave group #### 3. Non Ac immunized Neutral Relay - UF/UB, SF/3B, 6F/2B - 1260u for UF/4B - 1260u for SF/1BB - 1840u for 6F/12B #### 4. Interlocked Relay - 4F/4B - SF/3B - 6F/2B - 6152 #### 5. AC immunised Relay (Both top & bottom) - only 5F/3B = 1840 U - AC immunised Relay (Top immunised & bottom non immunised) - SF/1BB only = 1840 (Top) - SF/1BB only = 1260 (Bottom) ### Misc Metal to Metal Relays #### 1. Double Coil Relays - Used as ZIWRI, ZINWR, ZIRWR, WKR3, 21WR, W2R - in Point control cut. - Only 5F/1BB - 1340 2 (Top) - 1590 2 (Bottom) #### 2. Universal ECR - 3F/3 B - 83.1V 2 #### 3. WKR-1 - SF/1B - 1840 U #### 4. WKR-2 - SF/3B - 1840 U #### 5. WgR - 2F/2B - 1840U - Provide 10 sec time duration for point operation. #### 6. WR - 3F/12 B - 60 U #### 7. Siemens Motorised clockwise timer - 110 V AC 110^o - Timer Range 1 to 5 minutes #### 8. ECRs Relay - QECX-61 - Pick up current = 108 mA/AC, 50 ng - Drop away current = 72 mA/AC, 50 ng - Withstand continuous current = 250mA/Ae, 50 ng - 4F/UB (A to D Relay) - Voltage Drop across R18 R2 is less than 10 V @ 125 mA
