Siemens SIPROTEC 4 User Manual

[anlaufbeispiele-a-260602-kn, 1, en_US]
Figure 2-59
Startups according to examples A.1 and A.2
B) Above the thermal restarting limit:
•
A startup brings the machine from load operation into a temperature range far above the thermal
restarting limit and the machine is stopped. The minimum inhibit time and the equilibrium time are
started and 66 TRIP is reported. The temperature cool-down below the restarting limit takes longer
than 4310 T MIN. INHIBIT and 4304 T Equal, so that the time passing until the temperature falls
below the temperature limit is the decisive factor for clearing the message
66 TRIP . The thermal replica
remains "frozen" while the equilibrium time expires (see Figure 2-60, to the left).
•
A startup brings the machine from load operation into a temperature range just above the thermal
restarting limit and the machine is stopped. The minimum inhibit time and the equilibrium time are
started and 66 TRIP is reported. Although the temperature soon falls below the restarting limit, the
blocking 66 TRIP is preserved until the equilibrium time and the minimum inhibit time have expired
(see Figure 2-60, to the right).
Functions
2.8 Motor Protection
156 SIPROTEC 4, 7SJ62/64, Manual
C53000-G1140-C207-8, Edition 08.2016

Siemens SIPROTEC 4 Specifications

General

Brand	Siemens
Model	SIPROTEC 4
Category	Protection Device
Language	English