Square D Digest 179

Gas-Insulated Ring Main Units for Secondary Distribution Systems Class 6047 / Refer to Brochure 6000BR1202

Medium Voltage Switchgear

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Outgoing Line Module O DVCAS switchgear module O functions as an outgoing line to a downstream wind generator. There are two medium voltage cables per phase. Construction features include: • Metal base frame • Voltage presence indicator • MV cable compartment

– bushings for cable connection – clamps for MV cable connection

D + O Transformer protection + Outgoing line

DO

(I + D + O) Incoming line + Transformer protection + Outgoing line

I D

O

(I + I + D + O) Two Incoming lines + Transformer protection + Outgoing line

I I D O

Recommended Configurations

Incoming Line Module I DVCAS switchgear module I is a three-position switch-disconnector. It is recommended for the incoming line function from an upstream wind generator for the following reasons: • Reduces downtime caused by faults • Helps with fault detection • Reduces interruptions due to maintenance work • Improves energization works Module I is always connected to module D on the right with single-phase, coupling bushings. Construction features include: • Metal base frame • Operating mechanism compartment

Remote operation

Remote control

Motor power supply

– operating mechanism of the switch-disconnector – motor for the operating mechanism (optional) • MV cable compartment

RE - I

– bushings for cable connection • Stainless steel, gas-tight tank – busbar system – three position disconnector Table 11.56: Ratings Insulation level Powerfrequencywithstandvoltage(kV) Lightningimpulsewithstandvoltage,peak(kV) Rated current of the main busbar (A) Short time withstand current (kA/s) Short circuit breaking current capacity (kA) Short circuit making capacity, peak (kA) Internal arc withstand IAC AFL (kA/1s) Frequency (Hz) Rated voltage (kV)

11 SWITCHBOARDS AND SWITCHGEAR

M

Flair

Type

Rating

50/60

38

70

170 600

Module I

20/3 [24]

20 [24]

50

20 [24]

Degree of protection (NEMA/IP) HVcompartment

6/67

LVandoperatingmechanismcompartment

6P/3X

SF6 gas pressure at 20 ºC (PSI/bar)

4.35/0.3

[24] 25 kA for circuit breaker switchgear module D.

11-39

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