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POWER CONVERSION BATTERY CHARGER CLASS

Learn about the power circuit components of a Class 1E battery charger, including transformers, fuses, SCR's, diodes, varistors, and more. Understand how power is distributed and protected in a critical power system.

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POWER CONVERSION BATTERY CHARGER CLASS

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  1. NEA33 POWER CONVERSION BATTERY CHARGER CLASS

  2. Class ChargersMCC’sBattery PKA-H11 400A PKA-M41 PKA-F11 PKC-H13 300A PKC-M43 PKC-F13 PKA-H15 400A PKA-M41 PKA-F11 PKC-M43 PKC-F13 PKB-H12 400A PKB-M42 PKB-F12 PKD-H14 300A PKD-M44 PKD-F14 PKB-H16 400A PKB-M42 PKB-F12 PKD-M44 PKD-F14 See print 01-E-PKA-0001 8

  3. PKA-F11 has four spare cells that are maintained on charge with the spare Battery Charger PKN-H01. “Bitrode” 50 amp, 18 volt (Target Range 8.68 - 9.00 Vdc)

  4. Each backup charger has two output breakers to enable them to supply DC power to either bus (A or C and B or D) it serves. A mechanical interlock is provided between the breakers which prevents possible closing of both of the breakers simultaneously.

  5. How long can the Class 1E Batteries supply power continuously to class loads? • The Batteries will provide 2 hours of 125 VDC power continuously to all class IE electrical loads connected to the system. • If the inoperable DC electrical power subsystem cannot be restored to OPERABLE status within the required Completion Time, the unit must be brought to at least MODE 3 within 6 hours and to MODE 5 within 36 hours

  6. During modes 1 through 4, both DC trains consisting of all four control centers consisting of all four batteries and four battery chargers, are operable and energized to meet the Tech Spec requirements. • During modes 5 and 6, at least one train consisting of two control centers, including batteries and battery chargers, is operable and energized to meet the Tech Spec requirements.

  7. Design Basis for Class 1E Chargers: • Restore the batteries to their fully charged state condition within 12 hours regardless of plant condition, starting from a minimum battery design charge of 105 VDC.

  8. Some of the DC loads for PK: • DC power to the PN Inverters (Vital AC) • DC power to the PK Inverters (Shutdown Isolation Valves) • Reactor Trip Switchgear Control Power • Diesel Generator Control And Starting Circuit • Aux Feedwater Turbine Governor Control Panel • DC Control Power for PB and PG • Auxiliary Feedwater Pump A Turbine Trip And Throttle Valve • Aux Relay Panels • Other critical DC valves

  9. 125V DC non class IE power system (NK) The non class IE 125V DC power system consists of three independent non class IE 125V DC subsystems. Each subsystem (E, F, G) has a battery, 125V DC control center and/or 125V DC distribution panels and a battery charger supplied with 3 phase 480V AC power from a different MCC.

  10. Supplies 125V DC power to in-plant DC loads through MCC’s NKN-M45 and NKN-M46 and “D” panel NKN-D19.

  11. NON-CLASS BATTERY CHARGERS NKN-H17 (E) Battery Charger Norm. Feed NKN-M45 500 amp NKN-H18 (F) Battery Charger Norm. Feed NKN-M46 250 amp NKN-H19 (G) Battery Charger Supply to NKN-D19 50 amp NKN-H20 (E1) Battery Charger Alt. Feed NKN-M45 500 amp NKN-H21 (EF) Battery Charger Alternate to M45/M46 500 amp SEE PRINT 01-E-NKA-0001

  12. Normal lineup is the “F” Battery Charger NKN-H18 feeds NKN-M46 and the “E” Battery Charger NKN-H17 feeds NKN-M45. NKN-H18 is a 250 amp charger, smallest charger with the largest Battery (3650 AH) Each non class IE battery has sufficient capacity to independently supply the required loads for 4 hours following the loss of battery charger. NKN-F17 NKN-F18

  13. The backup charger (“EF”) has two output breakers to enable them to supply DC power to either bus (M45 or M46) it serves. A mechanical interlock is provided between the breakers which prevents possible closing of both of the breakers simultaneously. Easy way to remember what 480 volt MCC feeds the swing charger. NHN-M21 feeds NKN-H21.

  14. Some of the DC Loads for NK: • Main Turbine Emergency Lube oil Pumps (EBOP) • Main Turbine Seal Oil Pumps (SO) • Control Power for NA, NB, MA, Switchgear and Transformers. • (Includes protection relays). • Control power for NG • DC Power to the Plant computer (NQ) • Control Power to Diesel Generator • Trip circuit for Main Turbine • Control Power to Aux. Relay panels • Feedwater Trip and Reset control circuit (FW)

  15. EO02 – Identify the Battery Charger Power Circuit Components.

  16. Power Circuit

  17. The AC input Circuit Breaker CB1 Main transformer (T1) Back View Front View T1A T1B T1C

  18. Fuses for the main SCR's (F1-F6) Each of the six power SCR’s are fused to protect it from a high overload.

  19. SCR’s CR6 Free Wheeling Diode CR7 CR5 CR3 CR4 Blocking Diode CR8 CR1 CR2

  20. (MOV’s) Metal Oxide Varistor's (D1-D7): Protect SCR’s (CR1 – CR6) and Freewheeling diode (CR7

  21. Dc filter (L1, C1, and R1) R1 L1 C1

  22. RS1 Shunt to Local Ammeter And A2 & A3 boards RS2 Shunt to Remote Ammeter And alarm module

  23. The DC output circuit breaker (CB2): Used as a switch only Back-up chargers have two output breakers (CB2A and CB2B) CB1 CB2

  24. EO03 Explain the function of the components in the battery charger’s power circuit.

  25. Power is fed to the input transformer (T1). T1 is a three-phase delta to delta transformer. T1 provides power to the main SCR's and the 120VAC power to the Amplifier Board, and the Firing Module. • T1 also supplies power to all of the accessories, such as the power on indicator, the AC failure alarm (K3 relay) the three phase power monitor (K1) and the 0-24 hour timer motor.

  26. Review Prints E051-00018 and E051-00033

  27. The firing module receives the error signal from the Amplifier Board and determines how long the SCR’s need to fire for voltage correction. A1

  28. Control Circuit -10 vdc Common + 10 vdc 120 volt input from T1

  29. A3

  30. Control Circuit -10 vdc Common + 10 vdc 120 volt input from T1

  31. Non-Class Charger

  32. Class Charger

  33. NOTE: Polarity across the load Resistor (RL) does not change. NEA07 Slide 28

  34. Polyphase alternating current, when rectified, gives a much “smoother” DC waveform (less ripple voltage) than rectified single-phase AC.

  35. Alarm Module “32” “37” “27C” “59”

  36. Alarm Module The battery charger’s alarm module contains four (4) alarm circuits on printed circuit boards that are connected to a mother board. The DC Relay on each Alarm board actuates the (K-2) Summation Alarm. All of the cards have an LED that indicates as follows: ALARM CARD NORMAL ALARM Reverse Current LED off LED on Charger Failure LED on LED off Low Voltage LED on LED off High Voltage LED off LED on Note: the LED on the Charger Failure Alarm Board will be in alarm condition until the Battery Charger senses a load on the bus.

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