Protection equipment for medium and high-voltage grids
10Pages

ids ACOS 300 Protection equipment for medium and highvoltage grids

ACOS 300 – Protection Devices Already minor incidents, such as branches dropping on overhead lines or underground cables damaged by construction works, may lead to short circuits or earth faults and, consequently, cause hazard to valuable equipment through dangerous currents and voltages. In the worst of cases, even human life may be put at risk. Power failures resulting from such incidents can lead to incalculable risks. Moreover, power infeeds from renewable energy sources and their volatility put additional strains on power grids. Therefore, efficient solutions for energy distribution...

Overcurrent Protection and Earth-Fault Protection Earth fault protection: Double earth fault Tripping characteristic – overcurrent protection Tripping characteristic – earth fault protection Overcurrent Protection Earth-Fault Protection All ACOS 300 devices include an overcurrent protection function as a standard. The simplest variant, ACOS 351, is designed for non-directional overcurrent protection. Tripping takes place either independently of the current, or current-dependent, with inverse characteristics according to IEC 60255-151, Edition 1.0, 2009-08 and IEEE. Earth faults or ground...

Distance Protection and Line Differential Protection Tripping characteristic – line differential protection Tripping characteristic – distance protection Distance Protection Line Differential Protection An algorithm that is specially adapted to insulated and deleted networks ensures reliable, safe and selective operation. Up to five zones can be parameterised using an individually configurable polygon. A protection function against inadvertent energizing ensures quick reactions to an existing fault (e.g. after an automatic reclosing) upon connection. If a double earth fault is detected, the...

Trafo Differential Protection and Motor Protection Tripping characteristic neutral point differential protection Tripping characteristic transformer differential protection Transformer Differential Protection Motor Protection A comparison of measured currents (primary, secondary and tertiary) takes place after numerical adaptation of switching groups and amplitudes and after an evaluation of the second and fifth harmonic for transformer inrush stabilisation. If the detected differential current is too high, a tripping command is generated. Additionally, the zero-current differential...

Control, Parameterisation and Diagnostics Fault log– Voltage Fault log – Current Front view Web server Local Control, Parameterisation and Diagnostics Control, Parameterisation and Diagnostics via Web Server ACOS protection devices can be easily operated via the 3.5” colour touch display and four capacitative touch keys. Indications on the display are, to a large extent, freely configurable and can be adapted to the user’s requirements. A web server that is accessible via ordinary web browsers provides several additional servicing functions, namely ■ online parameterisation ■ firmware...

Communication and Engineering Display configurator Function plan Communication Engineering Tool The following standard protocols can be used for system communication: ■ IEC 61850 ■ IEC 60870-5-103 ■ IEC 60870-5-104 The engineering tool included in the ACOS protection equipment is designed for intuitive operation and enables the user to make the following settings: ■ off-line parameterisation of protection and control functions ■ hardware and software configuration ■ system settings ■ communication settings ■ creation of static and dynamic displays, e.g. single-line diagrams, switches,...

Tests and Certificates The protection devices of the ACOS 300 series are certified according to the following standards: Criteria Norm Insulation resistance Surge voltage AC withstand voltage EN 60255-5, Class III EN 60255-5, Class III Interference immunity (EMC) Electrostatic discharge Radiated radio-frequency electromagnetic fields Burst Surge Conducted radio-frequency common mode Power frequency magnetic fields Voltage dips and short interruptions Damped oscillatory waves EN 61000-4-2, IEC 60255-22-2 EN 61000-4-3, IEC 60255-22-3 EN 61000-4-4, IEC 60255-22-4 EN 61000-4-5, IEC 60255-22-5...

ACOS 300 Technical Data Feature Supply voltage Power supply backup time ids Value 60 - 300 V DC/85 - 265 V AC 200 ms CPU 2 x 500 MHz Display and control elements 4 capacitive touch keys (ON, OFF, scrolling, LED acknowledgement) 16 LED (configurable, 3 colours) Visualisation 3.5” TFT colour touch display; 320*240 pixels Service interface 1x Ethernet 10/100 Base-TX Combined Ethernet/COM interface (Ethernet Over Board) Communication interfaces (optional) 1 x Ethernet 10/100Base-TX 1 x Ethernet 10/100Base-FX 1 x RS 485/RS 422 1 x serial optical Communication protocols IEC 61850 IEC 60870-5-103...

ACOS 355 line differential protection ACOS 357 motor protection ACOS 392 two-winding transformer protection ACOS 395 three-winding transformer protection ACOS 354 distance protection ACOS 351 non-directional overcurrent protection ACOS 353 directional overcurrent protection ACOS 300 Protection Functions ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 87T 2W 3W REF 87N ■ ■ Overvoltage protection U>, U>> 59 ■ ■ ■ ■ ■ ■ Undervoltage protection U<, U<< 27 ■ ■ ■ ■ ■ ■ Uo>, Uo>> 59N ■ ■ ■ ■ ■ ■ U2> 47 ■ ■ ■ ■ ■ f<, f<<, f>, f>> 81 ■ ■ ■ ■ Rate-of-frequency-change...