RMU

Division : S2 – MV Switchgear Category : General 1

Ring Main Unit- Product Presentation

Division : S2 – MV Switchgear Category : General

CG LUCY SWITCHGEAR

CG Lucy Switchgear Ltd is a joint venture company of Crompton Greaves Ltd., India and W.Lucy & Co. Ltd., U.K. Established in 1994, the factory is situated at Nasik, India.

With 30000 sq.feet of area, the facility has modern automated equipments with all major testing facilities, to guarantee quality products.

CG Lucy is a ISO 9001:2000 Certified company.

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New Factory

CG Lucy is the largest manufacturer of SF6 gas insulated Vacuum RMU in India. With near total population in many metro’s, our RMU’s make the metro’s of India to glow with reliable power.

Oil RMU’s is another most sought product not only in India, but also in the South Asian countries, especially in Malaysia. This is an economical & highly reliable product which uses HT Fuse links immersed in the Oil chamber.

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Ring Network

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Distribution Network

MAIN SUBSTATION

RMU

FEEDER PILLAR

RMURMU

COMPACT SUBSTATION

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‘SABRE’ RING MAIN UNITS (RMU)- SF6 Encapsulated Vacuum RMU


‘SABRE’ Designation

Code Product Description

VRN Vacuum Ring Main Unit - Non ExtensibleVRE Vacuum Ring Main Unit – ExtensibleVCE Vacuum Circuit Breaker - Extensible

SSE Single Switch – ExtensibleDSE Double Switch – Extensible


‘SABRE’ Range

SABRE VRE/ VRN: - 2 Ring Switches + 1 Circuit Breaker

SABRE SSE / DSE- 1 / 2 Ring Switches

SABRE VCE- 1 Circuit Breaker


SABRE : VRN


SABRE : VRE


SABRE : VCE


SABRE : SSE


Single Line Diagram - VRE

Integral cable testing Facility

Integral cable testing Facility

Ring Switch Ring Switch

Off Load Switch

Vacuum Circuit Breaker

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Extensibility – 6 way RMU (VRE+VRE)

Loop IN Loop OUTLoop OUT Loop OUT

Extension for Future

Tr. FeederExtension for

Future

Tr. Feeder

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Extensibility – 4 way RMU (VRE+VCE)

Tr. Feeder

Loop IN Loop OUT

Tr. FeederExtension for

FutureExtension for

Future


Multi Circuit Range (MCR) RMU- SF6 Encapsulated Vacuum RMU


MULTI CIRCUIT RANGE (MCR)

MCR is a versatile SF6 insulated Vacuum Ring Main Unit – a combination of vacuum circuit breaker unit and fault-make load break switches (Ring switch / Isolators).

With front cable terminations, the system is highly compact and well protected with Pad-lock, interlock & earthingfacilities.


MCR – 5 Way Under Assembly

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MCR – Range & Extensibility


Technical Data – SABRE & MCR

Variants SABRE - VRE VRE - 6A SABRE MCRRated Voltage kV 24 12Rated Current A 630 for Ring Switch

& 400 for CB 630

Symmetrical Breaking Capacity kA / sec 16 / 3 21 / 3

Making Current kAp 40 52.5Impulse Withstand kVp 125 75 / 95 (optional)Min Gas Pressure Bar

0Filling Pressure Bar 0.5 0.4Index of protection IP 54Cable terminationIncoming Side Bottom Front BottomTee off Rear Bottom Front BottomCable Tests Bottom Bottom Bottom TopDimensionsWidth 935 948 935 1300Depth 1030 1085 1078 900Height 1333 1750 1470 1400Weight kg 410 350 450 540 (3way)

IP 54

Side BottomRear Bottom

0

0.4

75 / 110 (optional)

52.5

12 / 15.5

630

21 / 3

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Applicable Standards

RMU’s has been fully certified in accordance with IEC standards:

- IEC 60129- IEC 60056- IEC 60265-1- IEC 60298- IEC 60694- IEC 60526 & IEC 60529

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Features

Low gas operating pressure - 0.5 Bar

Pressure indicator and SF6 recharging facility.

Gas pressure relief diaphragm for internal arcing.

Low Temperature rise of Busbars , hence no derating of switches at ambient of 45 to 50 Deg C.

CB Earthing through Vacuum Interrupters hence full rating for earthing circuit.

Operational Safety - We have tested our RMU with ZERO gas pressure for satisfactory electrical performance.

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Stainless Steel Tank: SS is the most preferred material for Gas Insulated System because of its high resistance to corrosive and humid atmosphere.

Extensibility: RMU is extensible on both sides. This feature give greater flexibility to Utility’s planning department to plan future extensions.

Outdoor Application: RMU is suitable for outdoor application. It is IP54 tested. This prevents construction of extra room to house the switchgear.

Gas leakage - For a SF6 Insulated VCB type RMU, the chances of Vacuum bottle leaking and SF6 gas leakage from chamber, simultaneously are very rare. Hence in VCB type RMU provides a double protection scheme.

Features

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Features – Vacuum Dielectric Medium

Ionization of Gas: Since fault is broken in Vacuum Interrupter, the SF6 gas is not polluted.

Constant dielectric: There is no gas decomposition products in vacuum and hermetically sealed vacuum interrupter keep out all environmental effects.

Electrical life: Vacuum interrupters, have longer electrical life, duties exceeding IEC limits / requirements.

High total current switched: Since the contact piece erosion is small, rated normal current can be interrupted more than 20000 times and rated shortcircuit breaking current on average a hundred times.

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Stainless Tank – Robotic Welding

Tank Helium Leak Tested

SF6 Filling at 0.1 torr

Quarantine for 10 days

Low SF6 Pressure

Pressure Indication

Facility for SF6 Recharging on site

Features - SF6 Leak Prevention

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Time limit fuses

Electronic Over current and earth fault relays

Auxiliary powered or self powered Relays

Transformer Protection

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Current Transformers with Relay for transformer protection

Transformer Protection

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Cable Testing

Step-1

Step-2

Step-3

Test Bushing

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Bottom or Top Entry

Side & Rear Termination for operator Safety

Full terminal access

Interlocked cable test facility

SABRE Cable Boxes

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Facia Details

All Live parts fully coveredAll positions visible from frontPadlocking in all position– ON / OFF / EARTH

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GA - Overview

Circuit Breaker operating Mechanism

Ring Bushing

Bursting Disk

Gas Pressure Gauge

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Earth/Service operation interlock

Positively driven Indicators (3 positions)

Ring Switch Mechanism

Indication Operating Lever

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Features: Mechanism

Highly reliable time proven mechanism.

Common frame for both switches ensure accurate center alignment.

Use of stainless steel and brass bushings eliminates effects of

corrosion.

5mm thick stainless steel for Service/Earth selectors and interlocks

to avoid possible damage due to mis-operations.

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Ring Switch

Interswitch barrier

Insulated Drive Disc

Key Advantages:

Reduced number of parts

Self aligning contacts

Compact design

Rear Support Disc allowing automatic self alignment of rear bearing

Support Disc

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Ring Switch & Circuit Breaker Module

CG make Vacuum interrupters

High Fault switching capability

Fixed contacts for Circuit Breaker selector

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Contact Arrangements

Hot Brass Stampings

A - Earth ContactB - Switch Blade PivotC - Line Contact

A B C

Benefits over casting:

Better durabilityBetter electrical and mechanical properties

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Live line indication

Earth Fault Indicators

Emergency push button

Key interlocks

Motorization

Remote control & monitoring

Optional Accessories

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FE Stress Analysis

Insulated Drive Plate

SAFETY – Never Compromised

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We are committed towards providing the best safety features & our products undergo rigorous testing for its reliability.


Robotic Welding

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Assembled in Pressurized Clean RoomControlled entry for personnel and materialOnly trained operators are used as per training matrix

Module Building

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Chamber test

Leak Monitoring

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Leak Monitoring – Sniff test

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Electrical Testing

High Voltage Test

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TRIDENT OIL RING MAIN UNIT


‘TRIDENT’ Designation

Code Product Description

FRMU Fused Ring Main Unit - Non Extensible

FRMUE Fused Ring Main Unit – Extensible

EFS Extensible Fuse Switch

NEFS Non Extensible Fuse Switch

EOS Extensible Oil Switch


‘TRIDENT’ Range

TRIDENT FRMUE/ FRMU: - 2 Ring Switches + 1 Fuse Switch unit

TRIDENT EFS / NEFS- 1 Fuse Switch unit

TRIDENT EOS- 1 Switch unit


Fused tee-off oil switch, with 2 ring oil switches in a separate chamber

Transformer mounting or free standing

Tripping facility manually, fuse striker pin or remote electrical signal

FRMU Oil Ring Main Unit


Technical Parameters

Ring Switch Fuse SwitchRated Voltage kVRated Current A 630 400Breaking Capacity Main / Earth kA 0.63 20Making Capacity Main / Earth kAp 55 / 55 50 / 7.8Impulse Withstand kVp 110 110Index of protection IP 54

FRMU / NEFS / EFS / EOS / DEOSTRIDENT Variants

12 / 15.5

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Extensibility – FRMUE & EFS

RMU: Two incoming & Three Outgoing


Thank you

RMU

Documents

s2 mv switchgear category

vre division

vce division

sse division

vrn division

ring network division

circuit breaker division

assembly division