Characteristics - Siemens Siprotec 7VK61 Manual

Introduction

1.3 Characteristics

1.3 Characteristics
General Features
• Powerful 32-bit microprocessor system
• complete numerical processing of measured values and control, from sampling and digitalising of the ana-
logue input values up to tripping commands to the circuit breakers
• complete galvanic and reliable separation between the internal processing circuits from the measurement,
control, and power supply circuits by analogue input transducers, binary inputs and outputs and the DC/DC
or AC voltage converters
• simple device operation using the integrated operator panel or a connected personal computer with operator
guidance
• simple device operation using the integrated operator panel or a connected personal computer with operator
guidance
Automatic Reclosure Function (optional)
• For reclosure after single-pole, three-pole or single-pole and three-pole tripping
• Single or multiple reclosure (up to 8 reclosure attempts)
• With separate action times for every reclosure attempt, optionally without action times
• With separate dead times after single-pole and three-pole tripping, separate for the first four reclosure at-
tempts
• Controlled optionally by production pickup with separate dead times after single, two-pole and three-pole
pickup
• Optionally with adaptive dead time, reduced dead time and dead line check
Synchronism and Voltage Check (optional)
• Verification on the synchronous conditions before reclosing after three-pole tripping
• Fast measuring of voltage difference U
• Alternatively, check of the de-energized state before reclosing
• Closing at asynchronous system conditions with prediction of the synchronization time
• Settable minimum and maximum voltage
• Verification of the synchronous conditions or de-energized state also possible before the manual closing of
the circuit breaker, with separate limit values
• Phase angle compensation for voltage measurement behind a transformer
• Measuring voltages optionally phase-pase or phase-earth
Time overcurrent protection (optional, available with breaker failure protection)
• Two definite time stages (DT) and one inverse time stage (IDMT), each for phase currents and earth current
• For inverse time overcurrent protection a selection from various characteristics based on several standards
is possible
• Blocking capability e.g. for reverse interlocking with any element
• Instantaneous tripping by any stage when switching onto a fault
20
, on the phase angle difference ϕ
diff
and frequency difference f
diff
SIPROTEC, 7VK61, Manual
C53000-G1176-C159-3, Release date 05.2009
diff