SIPROTEC 7SK85 Motor Protection


Catalog excerpts

SIPROTEC 7SK85 Motor Protection - 1

Description The SIPROTEC 7SK85 motor protection device is designed for the protection of motors of all sizes. With its modular structure, flexibility and the high-performance DIGSI 5 engineering tool, SIPROTEC 7SK85 offers future-oriented solutions for protection, control, automation, monitoring, and Power Quality - Basic. For motors in explosive environments, the SIPROTEC 7SK85 is also available with EN 60079-14 or VDE 0165, Part 1, ATEX (Verband der Elektrotechnik, Elektronik und Informationstechnik) certification. Main function Motor protection for motors of all sizes Inputs and 3 predefined standard variants with 4 current transformers, 4 voltage transformers, 11 to 27 binary inputs, 9 to 17 binary outputs Hardware flexibi Flexibly adjustable and expandable I/O quantity structure within the scope of the modular llty SIPROTEC 5 system. 1/6 expansion modules can be added, available with large or small display, or without display Housing width 1/3 x 19 inch to 2/1 x 19 inch Applications • Protection against thermal overload of the stator from overcurrent, cooling problems or pollution • Protection against thermal overload of the rotor during startup due to: Frequent startups, excessively long startups or blocked rotor • Monitoring for voltage unbalance or phase outage • Monitoring the thermal state and the bearing temperatures with temperature measurement • Detection of idling drives of pumps and compressors, for example • Detection of ground faults in the motor • Protection against motor short circuits • Protection against instability due to undervoltage. SIPROTEC 5 Device with Expansion Module • Detection and recording of power-quality data in the medium-voltage and subordinate low-voltage power system Functions DIGSI 5 permits all functions to be configured and combined as required. • Motor protection functions: Starting time supervision, thermal overload protection for stator and rotor, restart inhibit, unbalanced-load protection, load-jam protection • Stator and storage-temperature monitoring via temperature sensors with external RTD unit. • Differential motor protection as fast short-circuit protection for motors of high power • Sensitive ground-fault protection (non-directional, directional) to detect stator ground faults • Directional and non-directional overcurrent protection (shortcircuit protection) with additional functions • Ground-fault detection using the pulse-detection method • Overvoltage and undervoltage prote

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SIPROTEC 7SK85 Motor Protection - 2

Detection of ground faults of any type in compensated or isolated electrical power systems using the following functions: 3I0>, V0>, transient ground fault, cos 0, sin 0, harmonic, dir. detection of intermittent ground faults and admittance Arc protection events, signed firmware, or authenticated IEEE 802.1X network access. Simple, fast, and secure access to the device via a standard Web browser to display all information and diagnostic data, vector diagrams, single-line and device display pages • Power protection, configurable as active or reactive-power protection • Detection of current...

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