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Siemens 7SJ81 Siprotec 5 overcurrent protection numerical relay

Siemens 7SJ81 Siprotec 5 overcurrent protection numerical relay
Siemens 7SJ81 Siprotec 5 overcurrent protection numerical relay
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Product Code : 7SJ81
Brand Name : Siemens
Product Description

The SIPROTEC Compact7SJ81 provides 4 low-power current transformer inputs and optionally 3low-power voltage transformer inputs. With the same low-power currenttransformer (LPCT) a wide range of primary rated line currents can be covered.Objects with rated currents in the range from 20 A to 2500 A can be protectedwhen using low-power current transformers.

The followinglow-power current transformer ratios are suitable for the following primarycurrent operating rangesHighlights-300 A/225 mV for a primary operating currentrange of 60 A to 630 A-600 A/225 mV for a primary operating current range of120 A to 1250 A-1250 A/225 mV for a primary operating current range of 250 A to2500 A-100 A/225 mV for a primary operating current range of 20 A to 200 ASIPROTEC7SJ81 is a multi-functional motor protection relay. It is designed for theprotection of asynchronous motors of all sizes.

The relays have allthe functionality to be applied to a backup relay to a transformer differentialrelay.The relay provides numerous functions to respond flexibly to the systemrequirements and to deploy the invested capital economically. Examples for thisare exchangeable interfaces, flexible protection functions and the integratedautomation level (CFC).

Freely assignableLEDs and a six-line display ensure a unique and clear display of the processstates. In combination with up to 9 function keys, the operating personnel canreact quickly and safely in any situation. This guarantees a high operational reliability.Highlights-Inputs for Low power CTs and VTs according to IEC61869-6 (formerly IEC 60044-7 and IEC 60044-8)-Removable terminal blocks-Binaryinput thresholds settable using DIGSI (3 stages)-9 programmable functionkeys-6-line display-Buffer battery exchangeable from the front-USB front port-2additional communication ports-integrated switch for low-cost and redundantoptical Ethernet rings-Ethernet redundancy protocols RSTP, PRP and HSR forhighest availability-Relay-to-relay communication through Ethernet with IEC61850 GOOSE-Millisecond-accurate time synchronization through Ethernet withSNTPThe SIPROTEC Compact 7SJ81 relays can be used for line/feeder protection ofhigh and medium-voltage networks with grounded, low-resistance groundedisolated or a compensated neutral point.

The relays have allthe functionality to be applied to a backup relay to a transformer differentialrelay.The SIPROTEC Compact 7SJ81 offers the highest reliability at majorfunctionality by the synergy of reliable algorithms with newly developed hardware.The reliability is proven by the experience in the field of almost 1,000,000SIPROTEC devices.The relay provides numerous functions to respond flexibly tothe system requirements and to deploy the invested capital economically.Examples for this are exchangeable interfaces, flexible protection functionsand the integrated automation level (CFC). Freely assignable LEDs and asix-line display ensure a unique and clear display of the process states. Incombination with up to 9 function keys, the operating personnel can reactquickly and safely in any situation. This guarantees a high operationalreliability.

 
CONTROL FUNCTIONS/PROGRAMMABLE LOGIC

   MONITORING FUNCTIONS

   8 oscillographic fault records

 


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