Facebook Twitter Instagram
    Trending
    • Testing of Circuit Breaker
    • Faults in Distribution Lines
    • Distribution System Overview
    • Transmission Towers
    • TRANSFORMER MAINTENANCE
    • OVERVIEW OF GENERATOR PROTECTION
    • TYPES OF EXCITATION SYSTEM
    • Functions and Performance Requirements of Excitation Systems
    Learn With Electric Know How
    • Home
    • Generation
      • Hydropower Station
      • Thermal Power Station
      • DISTRIBUTED ENERGY SOURCES
      • Diesel Generator
      • Industrial Tools
      • DC System-Generating Stations
    • Transmission
      • High Voltage DC Transmission
      • High Voltage AC Transmission
      • Three Phase Control Wiring
    • Distribution
      • Distribution System Overview
      • Faults in Distribution Lines
    • Protection
      • Power System Protection
        • Types of Fault in Power System
        • Circuit Breaker
      • OVERVIEW OF TRANSFORMER PROTECTION
        • Differential Protection of Transformer
      • OVERVIEW OF GENERATOR PROTECTION
      • Distance Protection
      • Electrical Safety
    • Switchgear
      • Electrical Sub-Station
        • BATTERY SYSTEM IN GRID SUBSTATION
        • Operation of Float Cum Boost Charger
        • Protection Circuitry of Battery Charger
        • Transformer
          • INSULATION RESISTANCE OF TRANSFORMER
          • WTI AND OTI in Power Transformer
          • Transformer Oil Dielectric strength
        • Sub-Station Operation
        • Multiplying Factor for Energy Meter
      • Current Transformer
      • Potential Transformer
      • Isolator in Substation
      • Electrical Busbar
      • Insulators
      • Clamps and Connectors
      • Fire Fighting System
      • Lightening Arrester
      • Gas Insulated Substation
        • Local Control Cubicle
        • SF6 circuit breaker gas compartment
    • Q&A
      • FAQS ON CT
      • POWER SYSTEM
      • FAQ ON BUSBAR
    Learn With Electric Know How
    Home»Switchgear»DC System-Generating Stations
    Switchgear

    DC System-Generating Stations

    madhusmitaBy madhusmitaNovember 25, 2022Updated:March 16, 2023No Comments3 Mins Read
    Facebook Twitter Pinterest LinkedIn Tumblr Email
    Share
    Facebook Twitter LinkedIn Pinterest Email

    D.C. Supply in a Power Station or Sub-Station is very essential as all most the protection and control system work on it allso at the time of A.C. failure, D.C. supply is utilized for emergency lighting.

    There are two sets of batteries for every 110 nos. of cells. Per each set, a provision is there for connecting either a boost charger or a float charger to the batteries for charging.

    Batteries and D.C.D.B.S which are in parallel to each other are normally kept charged from the respective trickle charger.

    On this condition the D.C. load of the Station is taken by float charger, thus keeping the battery sections in floating condition. In case of failure of float charge the D.C. load is taken care of by the batteries. Secondly, at the time of heavy D.C. drawal the output voltage of the trickle charger falls down and the battery supplies the excess load causing the better voltage to fall down rapidly. In such a case the charger has to be switched on immediately.

    It charges the batteries as well as feeds the connected load. To operate the boost charger trickle charger has to be made “OFF” (D.C. output switch M.C.C.B-I of the trickle charger is to be made off).

    CHECKING OF BATTERY:

                   Normally while the batteries are in the charged condition the specific gravity of the electrolyte should be kept at 1200 ± 0.005 at 27 0C. This should be checked once a shift at least 24 hrs intervals. This can be ascertained by taking the specific gravity of the pilot cells only. The specific gravity of the electrolyte is important because it indicates the state of charge of batteries while it is in operation.

                   The level of the electrolyte should be checked while checking the batteries

    NOTE:   When the boost charger is made “ON” the following points are to be kept in mind.

    1. When the cell voltage reaches 2.4V the charging current to be reduced to 42 amp approx.
    2. During this time hourly specific gravity voltage & temperature of the cells should be measured.

    When the specific gravity of electrolyte reaches 1.200, voltage per cell reaches 2.7V approx. at a temperature of the electrolyte below 480C, the charge is completed. During charging if the temperature rises beyond 48 0C, the charging current should be reduced so that it will not exceed 48 0C. After observing the specific gravity of 1.200 & Volt per Cell 2.7 V for three consecutive readings at an interval of one hour, the boost charger to be made Off & the batteries should be charged by float charger and kept in auto. 

    CHANGING OVERLOAD FROM D.C.D.B – I TO D.C.D.B – II OR VICE – VERSA.

                   In case of maintenance or fault in Battery set-I, the load can be transferred to battery set-II and vice versa. In such case Bus-coupler is to be made on DCDB Incommer – I to be made ‘OFF’. AC supply to Charger – I to be made ‘OFF’.

    D.C. EMERGENCY SUPPLY ON:

                   In the case of D.C., emergency supply from external source channel 5 will glow them hooter will also come.

    Share. Facebook Twitter Pinterest LinkedIn Tumblr Email
    Previous ArticleHydropower Station
    Next Article Transformer Oil Dielectric strength
    madhusmita
    • Website
    • Facebook
    • Instagram
    • LinkedIn

    Related Posts

    TRANSFORMER MAINTENANCE

    December 26, 2022

    On Load Tap Changing of Transformer

    November 25, 2022

    Transformer Oil Dielectric strength

    November 25, 2022

    Comments are closed.

    Recent Posts
    • Testing of Circuit Breaker
    • Faults in Distribution Lines
    • Distribution System Overview
    • Transmission Towers
    • TRANSFORMER MAINTENANCE
    Recent Comments
    • Faults in Distribution Lines - Learn With Electric Know How on Distribution System Overview
    • POWER SYSTEM - Learn With Electric Know How on Distribution System Overview
    • POWER SYSTEM - Learn With Electric Know How on Thermal Power Station
    • Basics of Power System Protection - Learn With Electric Know How on OVERVIEW OF GENERATOR PROTECTION
    • Functions and Performance Requirements of Excitation Systems - Learn With Electric Know How on TYPES OF EXCITATION SYSTEM
    Archives
    • March 2023
    • December 2022
    • November 2022
    Categories
    • Distribution
    • Generation
    • Protection
    • Q&A
    • Switchgear
    • Transmission
    • Uncategorized
    Meta
    • Register
    • Log in
    • Entries feed
    • Comments feed
    • WordPress.org

    Quick Links

    • Home
    • About Us
    • Contact Us

    Post Categories

    • Generation
    • Transmission
    • Distribution
    • Protection
    • Switchgear
    • Q&A

    Vip Link

    • Privacy Policy
    • Disclaimer
    • Terms and Conditions

    Contact Us

    • [email protected]
    Youtube Linkedin