The SIPROTEC easy is a numerical overcurrent protection device which is primarily intended as a radial feeder or transformer protection (backup) in electrical networks. It provides definite time and inverse time characteristics according to IEC and ANSI standards. The convenient setting with DIP- switches is self-explaining and simple. The compact housing allows an easy mounting. A version for the most adverse environmental conditions is also available.

The SIPROTEC easy device has an AC- and DC auxiliary power supply with a wide range allowing a high degree of flexibility in its application. Phase selective indication of protection pick -up is indicated with LEDs.

The protective device SIPROTEC 7SJ602 extends the functionality of the established SIPROTEC 7SJ600.
Features:

• complete functionality as 7SJ600
  
• additive fourth current transformer input for separate measurement of the earth current
  
• front interface for link to PC
  
• system interface (alternatively RS 485, RS 232, or fibre-optic)
  
• 1 control command (without feedback signal)
  
• 1 fault recording with storage after auxiliary voltage failure

The SIPROTEC 7SJ62 relays can be used for line protection of high and medium voltage networks with earthed (grounded), low-resistance earthed, isolated or compensated neutral point. For motor protection, the SIPROTEC 4 7SJ62 is suitable for asynchronous machines of all sizes. The relay perform all functions of backup protection supplementary to transformer differential protection.

The relay provides a simple control of the circuit-breaker and automation functions. The integrated programmable logic (CFC) allows the user to implement their own functions, e.g. for the automation of switch-gear (interlocking). The user is also allowed to generate user-defined messages.

The flexible communication interfaces are open for modern communication architectures with control system.
Extensive communication options:

• Integration into control and protection
• Service interface via modem.
  

Supersedes: 7SJ512/7SJ531

The SIPROTEC 4 7SJ63 can be used as a protective control and monitoring relay for distribution feeders and transmission lines of any voltage in networks that are earthed, low-resistance earthed, unearthed, or of a compensated neutral point structure. The relay is suited for networks that are radial or looped, and for lines with single or multi-terminal feeds. Regarding the time-overcurrent/directional time-overcurrent protection the characteristics can be either definite time, inverse time or user-defined.

The SIPROTEC 4 7SJ63 is equipped with motor protection applicable for asynchronous machines of all sizes. Motor protection comprises undercurrent monitoring, starting time supervision, restart inhibit, locked rotor.

The relay provides easy-to-use local control and automation functions. The number of controllable switchgear depends only on the number of available inputs and outputs. The integrated programmable logic (CFC) allows the user to implement their own functions, e.g. for the automation of switchgear (interlocking). The user is able to generate userdefined messages as well.

The flexible communication interfaces are open for modern communication architectures with control systems.
Extensive communication options:

• Integration into substation control system
  
• Service interface via modem for protection engineer
  

Supersedes: 7SJ531

The SIPROTEC 4 7SJ64 can be used as a protective control and monitoring relay for distribution feeders and transmission lines of any voltage in networks that are earthed, low-resistance earthed, unearthed, or of a compensated neutral point structure. The relay is suited for networks that are radial or looped, and for lines with single or multiterminal feeds. The SIPROTEC 4 7SJ64 is equipped with a synchronization function which provides the operation modes "synchronization check" (classical) and "synchronous/asynchronous switching" (which takes the CB mechanical delay into consideration). Motor protection comprises undercurrent monitoring, starting time supervision, restart inhibit, locked rotor. Furthermore it supports all functions known from 7SJ63/62 like non-directional and directional time-overcurrent / motor / voltage/ frequency protection and automation functions.

The relay provides easy-to-use local control and automation functions. The number of controllable switchgear depends only on the number of available inputs and outputs. For temperature monitoring of up to 12 measuring points two RTD (resistance temperature detector) - boxes may be connected to 7SJ64. The integrated programmable logic (CFC) allows the user to implement their own functions, e.g. for the automation of switchgear (interlocking). CFC capacity is much larger compared to 7SJ62/63 due to extended CPU power. The user is able to generate user-defined messages as well.

The flexible communication interfaces are open for modern communication architectures with control systems.

Extensive communication options:

• Integration into substation control system
  
• Service interface via modem for protection engineer
  

• 7SJ50 Overcurrent Protection - replaced by 7SJ600 Overcurrent Protection.
• 7SJ511 Overcurrent Protection - replaced by 7SJ61 Multifunction Protection.
• 7SJ512 Overcurrent Protection - replaced by 7SJ62 Multifunction Protection.
• 7SJ531 Line and Motor Protection - replaced by 7SJ63 Multifunction Protection.
• 7SJ551 Line and Motor Protection - replaced by 7SJ61/62 Multifunction Protection with RTD box.