Characteristics - Siemens SIPROTEC 4 7VK61 Manual

Introduction

1.3 Characteristics

1.3 Characteristics
General Features
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Powerful 32-bit microprocessor system
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Complete digital processing of measured values and control, from the sampling and digitizing of the
measure quantities up to the closing and tripping commands to the circuit breakers
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Complete galvanic separation and interference immunity of the internal processing circuits from the
measurement, control, and power supply circuits by analog input transducers, binary inputs and outputs
and the DC/DC or AC/DC converters
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Simple device operation using the integrated operator panel or a connected personal computer with
operator guidance
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Storage of fault indications and instantaneous values for fault recording
Automatic reclosure function (optional)
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For reclosure after 1-pole, 3-pole or 1-pole and 3-pole tripping
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Single or multiple reclosure (up to eight reclosure attempts)
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With separate action time setting for the first 4 reclose attempts, optionally without action times
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With separate dead times after 1-pole and 3-pole tripping, separate for the first four reclosure attempts
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Controlled optionally by protection pickup with separate dead times after 1-pole , 2-pole or 3-pole pickup
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Optionally with adaptive dead time, reduced dead time and dead line check
Synchronism and voltage check (optional)
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Verification of the synchronous conditions before reclosing after three-pole tripping
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Fast measurement of the voltage difference U
difference f
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Alternatively, check of the de-energized state before reclosing
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Closing at asynchronous system conditions with consideration of the CB closing time to achieve system
re-connection when voltages are in phase
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Settable minimum and maximum voltage
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Verification of the synchronous conditions or de-energized state before manual closing of the circuit
breaker is possible with separate setting thresholds and states
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Phase angle compensation for voltage measurement behind a transformer
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Measuring voltages optionally phase-phase or phase-earth
Time Overcurrent Protection (optional, available with breaker failure protection)
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Two definite time stages (DT) and one inverse time stage (IDMT), each for phase currents and earth
current
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For inverse-time overcurrent protection select from various characteristics based on several standards
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Blocking capability e.g. for reverse interlocking with any stage
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Instantaneous tripping by any stage when switching onto a fault
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Additional stage, e.g. stub protection, for fast tripping of faults between the current transformer and line
isolator (when the isolator switching status feedback is available); particularly well suited to substations
with 1 1 / circuit breaker arrangements.
2
22
diff
, the phase angle difference φ
diff
C53000-G1176-C159-5, Edition 05.2018
and the frequency
diff
SIPROTEC 4, 7VK61, Manual