American Audio VELOCITY - REV 4-05 Betriebsanleitung PDF herunterladen (Seite 145)

METRO RAIL DESIGN CRITERIA SECTION 9 / SYSTEMS

DE304.09 9-140 Revision 4 : 05/09/12

Metro Baseline Re-Baseline: 04/29/10

1. Protective relays and other necessary devices shall be provided and

individually set in accordance with a detailed and comprehensive protection

coordination study, in order to assure effective, safe, and selective isolation

of faults at any point in the system in any operational scenario.

2. Each AC high voltage circuit breaker shall be provided with the

instantaneous, inverse time, phase rotation, and under voltage relays.

3. Each DC feeder breaker shall be provided with over-current and rate of rise

relays. The rate of rise relays shall be capable of discriminating any low level

short-circuit currents from any train operational currents at any time and any

point of the line. The associated DC breaker shall trip for a low level short-

circuit and not trip for a normal operational current.

4. All rectifier transformers and rectifier units shall be provided with over-

temperature protection.

5. The DC feeders shall include Load Measuring Systems capable of testing

the line for the presence of faults before allowing the closing of the

associated feeder breakers. In the event of a trip of the respective breaker

due to a short-circuit, three attempts will be made to re-close it. In the case

that the three re-close attempts fail, the respective breaker will be locked

out. Automatic re-closing shall not be allowed upon tripping of the respective

breaker by any ground relay.

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American Audio VELOCITY - REV 4-05 Betriebsanleitung Seite 145