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SIPROTEC 7SD86 Combined line differential and distance protection

SIPROTEC 7SD86 Combined line differential and distance protection
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SIPROTEC 7SD86 Combined line differential and distance protection - 1

Description The SIPROTEC 7SD86 line differential protection has specifically been designed for the protection of lines. With its modular structure, flexibility and the powerful DIGSI 5 engineering tool, the SIPROTEC 7SD86 device offers future-oriented solutions for protection, control, automation, monitoring and Power Quality - Basic. Main function Differential protection Interoperability of SIPROTEC 4 and SIPROTEC 5 line protection devices Tripping 3-pole, minimum tripping time: 9 ms Inputs and out- 12 predefined standard variants with 4/4 puts or 8/8 current transformers/voltage trans formers, 5 to 31 binary inputs, 8 to 46 binary outputs Hardware flexibi- Flexibly adjustable I/O quantity structure lity within the scope of the SIPROTEC 5 modu lar system Housing width 1/3 x 19 inch to 2/1 x 19 inch Applications • Line protection for all voltage levels with 3-pole tripping • Phase-selective protection of overhead lines and cables with single-ended and multi-ended infeed of all lengths with up to 6 line ends • Also used in switchgear with breaker-and-a-half layout • Transformers and compensating coils in the protection zone • Detection of ground faults in isolated or arc-suppres-sion-coilground power systems in star, ring, or meshed arrangement • Serial protection communication with SIPROTEC 5 and SIPROTEC 4 devices over different distances and physical media, such as optical fiber, two-wire connections, and communication networks SIPROTEC 5 Device with Expansion Module • Phasor Measurement Unit (PMU) • Detection and recording of power-quality data in the mediumvoltage and subordinate low-voltage power system Functions DIGSI 5 permits all functions to be configured and combined as required. • Minimum tripping time: 9 ms • Main protection function is differential protection with adaptive algorithm for maximum sensitivity and stability even with the most different transformer errors, current-transformer saturation and capacitive charging currents • Directional backup protection and various additional functions • Detection of ground faults of any type in compensated or isolated electrical power systems using the following functions: 3I0>, V0>, transient ground fault, cos 9, sin 9, dir. Detection of intermittent ground faults, harmonic detection and admittance measurement • Ground fault detection using the pulse detection method

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SIPROTEC 7SD86 Combined line differential and distance protection - 2

Detection of current-transformer saturation Fault locator plus for accurate fault location with in-homogenous line sections and targeted automatic overhead-line section reclosing (AREC) Arc protection Automatic frequency relief for underfrequency load shedding, taking changed infeed conditions due to decentralized power generation into consideration Power protection, configurable as active or reactive power protection Directional reactive power undervoltage protection (QU protection) Detection of current and voltage signals up to the 50th harmonic with high accuracy for selected protection...

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