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SIPROTEC 7SJ86 Overcurrent Protection as Backup Protection for Line Protection

SIPROTEC 7SJ86 Overcurrent Protection as Backup Protection for Line Protection
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SIPROTEC 7SJ86 Overcurrent Protection as Backup Protection for Line Protection - 1

SIPROTEC 7SJ86 Overcurrent Protection as Backup Protection for Line Protection www.siemens.com/siprotec Description The SIPROTEC 7SJ86 overcurrent protection has specifically been designed as backup or emergency protection for the line protection devices. With its modular structure, flexibility and the highperformance DIGSI 5 engineering tool, the SIPROTEC 7SJ86 device offers future-oriented solutions for protection, control, automation, monitoring, and Power Quality – Basic. Main function Overcurrent protection (V/inverse-time-overcurrent protection) 3 predefined standard variants with 4/4 current transformers/voltage transformers, 11 to 23 binary inputs, 9 to 25 binary outputs SIPROTEC 5 Device with Expansion Module Backup protection for differential protection devices of all kind for lines, transformers, generators, motors, and busbars Hardware flexibi- Flexibly adjustable and expandable I/O quantity lity structure within the scope of the SIPROTEC 5 modular system Phasor Measurement Unit (PMU) Reverse-power protection Housing width Detection and recording of power-quality data in the medium-voltage and subordinate low-voltage power system Backup and emergency protection for line protection Detection and selective 3-pole tripping of short circuits in electrical equipment of star networks, lines with infeed at one or two ends, parallel lines and open-circuited or closed ring systems of all voltage levels Used in switchgear with breaker-and-a-half layout configuration Detection of ground faults in isolated or arc-suppression-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 Functions DIGSI 5 permits all functions to be configured and combined as required. • Overcurrent protection as backup / emergency line protection for all voltage levels with 3-pole tripping Optimized tripping times due to directional comparison and protection data communication Detection of ground faults of any type in compensated or isolated electrical power systems using the following functions: 3I0>, V0>, transient ground fault, cos φ, sin φ, dir. detection of intermittent ground faults, harmonic detection, and admittance measurement Fault locator plus for accurate fault location with inhomogenous line sections and targeted automatic overhead-line

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SIPROTEC 7SJ86 Overcurrent Protection as Backup Protection for Line Protection - 2

Arc protection Automatic frequency relief for underfrequency load shedding, taking changed infeed conditions due to decentralized power generation into consideration Overvoltage and undervoltage protection Frequency protection and frequency-change protection for load-shedding applications 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 functions (such as thermal overload protection) and...

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