HT Switchgear (LBS/VCB)

1No emergency trip push button (mechanical). Mimic: A single line diagram showing the direction of power flow shall be dawn on the front of load break switch. The mechanical operation of switch shall automatically indicate ON/OFF status of both main switch as well as the earth switch in the mimic diagram. Fluorescent lamps for sufficient illumination shall be provided.

CURRENT TRANSFORMER

Type                                                                      :               Resin cast, bar primary.

Ratio, burden accuracy class, cores          :               50/25/5/5A, 15VA, class 1.0formetering. 5P15for Protection for transformer feeder.

Short time rating                                              :               current 18.4 KA for 3sec

Dynamic stability                                              :               47KA peak

Insulation level

a} Impulse with stand voltage                    :               75 KV PEAK

1. b) PF with stand voltage : 28KV (RMS)

Thermal over load capacity                          :               120%continuous

Applicable standard                                        :               MPE-2021

POTENTIAL TRANSFORMER:

Type                                                                      :               Resin cast. Natural air cooled

Ratio                                                                      :               11KV/3, 110V/3

Rated burden                                                    :               20VAIPhase.class1.0

Connection                                                         :               Three single phase PT with suitable power pack for DC Shunt trip

Voltage                                                                :               factor 11continuous, 1.5 for 30 sec

INSULATION LEVEL

Impulse with stand voltage                         :               75KV (P)

PF with stand voltage                                     :               28KVRMS

Protection                                                           :               HV side 2Amp.HT HRC fuse for each phase

Applicable standard                                        :               MPE-2021

INDICATING METERS

Type of meters                                                 :               Ammeters. Voltmeters

Type of movement                                         :               Taut band

Size                                                                        :               96x96mm

Dial finish                                                             :               White painted dial with pointer type needle

Mounting                                                            :               Flush mounting’

Accuracy Class                                                   :               1.0

Voltage / current                                             :               110 V PT.5A CT sec current

Applicable standard                                        :               MPE-2021

INDICATING LMPS:

VCB ON/OFF/AUTO TRIP/Trip Circuit Healthy/Spring Charged indication lamps

LBS ON/OFF Indication lamp

RYB Indication Lamps

Indication lamps shall be complete with lens cover sand holders

Each lamp shall be fitted with a durable resistance integrally wired in series within the lamp.

The lamp cover (lens) shall be translucent of red color.

Bulbs and covers shall be inter changeable easily replaceable from the front without the need for any special means.

Terminals having potential above 120V shall be shrouded to prevent. Contact with personnel.