Ring Main Unit: 8DJH ST -...

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Ring Main Unit: 8DJH STCost efficient solution for secondary power distributionPresentation, Ver 1.0

April 14 IC LMV MS S GIS

8DJH ST: Secondary distribution


8DJH ST: Applications

RRR


8DJH ST: Applications


8DJH ST: SF6 gas for insulation

Vacuum for switching & SF6 for insulationNo toxic gases due to interruption in vacuum

Climate independent and maintenance free design

High dielectric strength thereby reducing volume of switchgear

Sealed for life

Safe and low-tolerance pressure co-ordination for pressure relief system


8DJH ST: Technical details

Ratings up to 12kV, 630A, 21kA 3s STCInternal arc classification IAC A FLR 20kA 0.1s [21kA 1.0s available on request]Factory-assembled, type-tested, metal-enclosed switchgear according to IEC 62271-200 Blocks consisting up to 5 feeders in a single tank



Technical features

Rated values up to 12kV, 21kA 3s

Rated frequency 50Hz

Busbar current up to 630A

Feeder current up to 630A

Busbars Single busbar

Rated power frequency withstand voltage 28kV 38kV

Rated lighting impulse withstand voltage 75kVp 95kVp

Rated making current 52.5kAp

Rated breaking current 21kA

Insulation Gas insulated

Switchgear vessel Hermetically sealed



Classification according to IEC 62271-200

Partition class PM

Loss of service continuity category LSC 2

Accessibility to compartments Busbar compartment: Non-accessibleSwitching-device compartment: Non-accessibleCable compartment: Interlock-controlled

Degree of protection For switchgear enclosure [Indoor]: IP3XFor switchgear enclosure [Outdoor]: IP54For gas filled vessel: IP65

Internal arc classification IAC A FLR 20 kA, 0.1 sIAC A FLR 21 kA, 1.0 s



One way typical [310mm]

Two way typical [620mm]

Three way typical [930mm]

Four way typical [1240mm]

Five way typical [1550mm]

R RK RRR RRRR RRRRR

L RR RRL RRRL LRRLL

K RL RLR LRRL LLLLL

S * LK

ME 1 $

ME 2 $

Legends: R [Ring main feeder] L [Circuit breaker feeder] K [Cable connection feeder]S [Bus coupler feeder] ME1 [Line metering feeder] ME2 [Bus metering feeder]

Extensibility options: on both side, on right hand side, on left hand sidePanel combination with metering will be on right side always. No further extensibility on right side possible with meteringBus coupler feeder will always have extensibility on both sidesWidth indicated above is for vessel

* - Width of Bus coupler feeder vessel is 620mm$ - Width of metering feeder vessel is 630mm



Dimensions

Block width depending on number and type of panels

645mm, 955mm, 1265mm, 1575mm

Panel height 1620 mm

Operating height <1500mm

Panel depth Bottom explosion: 820 mm Top explosion: 918 mm


8DJH ST: Vacuum circuit breaker

Technical details

Rated voltage 12kV

Rated current 630A

Basic insulation level 12kV / 28kV / 75kVp

Rated short time withstand current 21kA, 3s

Rated short circuit breaking / making current 21kA / 52.5kAp

Rated operating sequence O-3min-CO-3min-CO

Endurance class

Breaking [2,000 times mechanically without maintenance] M1 [IEC62271-100]

Breaking [2,000 times rated normal current without maintenance]

E2 [IEC62271-100]

Breaking [Low probability of restrikes] C1 [IEC62271-100]

Breaking [For cable systems] S1 [IEC62271-100]


8DJH ST: Three position disconnector for CB

Technical details


Endurance class

Disconnecting [1,000 times mechanically] M0

Earthing [1,000 times mechanically]

Earthing [5 making operations through VCB] E2


8DJH ST: Three position switch for Ring main feeder

Technical details

Rated voltage 12kV

Rated current 630A

Basic insulation level 12kV / 38kV / 95kVp


Rated short circuit making current 52.5kA

Rated breaking current 630A

Endurance class

Disconnecting [1,000 times mechanically] M0 [IEC62271-102]

Earthing [5 times rated short-circuit making current] E2 [IEC62271-102]

Load breaking [1,000 times mechanically] M1 [IEC 60265-1]

Load breaking [100 times rated breaking current5 times rated short-circuit making current]

E3 [IEC 60265-1]


Standards

Switchgear IEC 62271-1IEC 62271-100

DevicesCircuit BreakersDisconnector & Earthing SwitchSwitch-disconnectorVoltage detection systems

IEC 62271-200IEC 62271-102IEC 62271-103IEC 61243-5

Degree of protection IEC 60529

Insulation IEC 60071

Instrument transformersCurrent transformerVoltage transformer

IEC 61869-2IEC 61869-3

Installation & commissioning IEC 61936-1



8DJH ST: One way typical


8DJH ST: Two way typical


8DJH ST: Three way typical


8DJH ST: Four way typical


8DJH ST: Five way typical


8DJH ST: Constructional features [Vessel]

Stainless steel vesselInsensitive to temperature and pressure variations

Stable dew-point behavior

Modern and safe laser welding technology

Maximum flexural and burst strength

Safe and low-tolerance pressure co-ordination for pressure relief system

Maintenance-free [leakage of 0.1% p.a.]

High quality non magnetic SS


8DJH ST: Constructional features [Pressure detection systems]

ManometerClearly visible indication [Red/Green]

Refilling of gas possible

Optionally with signaling contact


8DJH ST: Constructional features [Pressure detection systems]

Ready for service indication [with aux contacts]Temperature and pressure compensated gas density measurement (2)

Magnetic coupling (3) between measurement box and indication

Independent of site altitude & ambient temperature

Optionally with signaling contact

Indication:4 Not ready for service5 Ready for service


8DJH ST: Constructional features [Cable connection]

Climate independent connection systemCable connections for bushings with outside cone

Insensitive to pollution and condensation

Switchgear or panel extension possible without gas work

Corrosion free and maintenance free connection


8DJH ST: Constructional features [Extension]

High flexibility for creation of switchgear configurationsBusbar extension possible on all individual panels & panel blocks [optional]

Plug-in unit consisting of contact coupling & screened silicone coupling

Centering via guide bolts & stop angles

Corrosion free and maintenance free connection


8DJH ST: Constructional features [Interlocks]

Switchgear interlocking with logical mechanical interlocksSwitching gate prevents direct operation from CLOSE to EARTH and

EARTH to CLOSE

Cable compartment can be removed only after feeder is eatthed and

operating lever removed

Active interlocks between circuit breaker and three position

disconnector

Closing and opening of circuit breaker not possible if operating lever is

inserted


8DJH ST: Constructional features [Interlocks]

Switchgear interlocking with logical mechanical interlocksOptional

Three position disconnector can be operated only if cable cover is

closed

Closing & opening lock-out in case cable cover is removed for three

position disconnector

Padlocking in all three positions


8DJH ST: Fault passage indicator

Short circuit / Earth fault indicatorIndication at the switchgear front

Factory assembled including sensor mounting

Manual / Automatic reset

Optical signals for a preselected pick-up values

Optionally remote electrical indication

Earth fault indicatorShort circuit indicator


8DJH ST: Voltage detection systems

Safe to touchWith voltage indicator

Verification of safe isolation from supply phase by phase

Voltage indicator flashes in presence of high voltage

Indicator suitable for continuous operation

Measuring system and voltage indicator can be tested


8DJH ST: SCADA compatibility

Ease of communicationMotorized VCB / LBS

Self powered numerical relay

Mini RTUs

Power pack

Control MCCBs

Pre wired auxiliary contacts


8DJH ST: Safe and Reliable

Safe and ReliableDielectric test

Temperature rise test

Short time withstand current

Peak withstand current

Verification of IP code

Pressure withstand test for gas-filled compartment

Tightness test

Internal arc test

Alternating pressure test [10,000 cycles]

Climatic tests on components

Switching performance test

Mechanical endurance test

Disconnector switch switching test


8DJH ST: Customer benefits


8DJH ST: We are serving


Thank You for your attention

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