Siemens siprotec 7SD5 User Manual

2 Functions
396
7SD5 Manual
C53000-G1176-C169-1
2.23 Function Control and Circuit Breaker Test
2.23.1 Function Control
The function control is the control centre of the device. It coordinates the sequence of
the protection and ancillary functions, processes their decisions and the information
coming from the power system.
Applications • Line energization recognition,
• Processing of the circuit breaker position,
• Open Pole Detector,
• Fault detection logic,
• Tripping logic.
2.23.1.1 Line Energization Recognition
During energization of the protected object, several measures may be required or de-
sirable. Following a manual closure onto a short-circuit, immediate trip of the circuit
breaker is usually required. This is done, e.g. in the overcurrent protection by bypass-
ing the delay time of specific stages. For every short-circuit protection function which
can be delayed, at least one stage can be selected that will operate instantaneously
in the event of a manual closing, as mentioned in the relevant sections. Also see
Section 2.1.4.1 at margin heading „Circuit Breaker Status“.
The manual closing command must be indicated to the device via a binary input. In
order to be independent of the duration that the switch is closed, the command is set
to a defined length in the device (adjustable with the address 1150 SI Time
Man.Cl). Figure 2-172 shows the logic diagram.
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Siemens siprotec 7SD5 Specifications

General

Brand	Siemens
Model	siprotec 7SD5
Category	Relays
Language	English