SiemensWINCC软件6AV6381-2BE07-5AV0

SIPROTEC 7SJ61 - Feeder and overcurrent protection, automation device

4xI, 4-line text or grafic display

The SIPROTEC 7SJ61 relays can be used for line protection of high and medium voltage networks with earthed (grounded), low-resistance earthed, isolated or compensated neutral point. When protecting motors, the SIPROTEC 7SJ61 is suitable for asynchronous machines of all sizes. The relay performs all functions of backup protection supplementary to transformer differential protection.The relay provides control of the circuitbreaker, further switching devices and automation functions. The integrated programmable logic (CFC) allows the user to implement their own functions, e. g. for the automation of switchgear (interlocking). The user is also allowed to generate user-defined messages. The flexible communication interfaces are open for modern communication architectures with control systems.

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The SIPROTEC 7SJ61 unit is a numerical protection relay that also performs control and monitoring functions and therefore supports the user in cost-effective power system management, and ensures reliable supply of electric power to the customers. Local operation has been designed according to ergonomic criteria. A large, easy-to-read display was a major design aim.

Control

The integrated control function permits control of disconnect devices, grounding switches or circuit-breakers via the integrated operator panel, binary inputs, DIGSI 4 or the control and protection system (e.g. SICAM). The present status (or position) of the primary equipment can be displayed, in case of devices with graphic display. A full range of command processing functions is provided.

Programmable logic

The integrated logic characteristics (CFC) allow the user to implement their own functions for automation of switchgear (interlocking) or a substation via a graphic user interface. The user can also generate user-defined indications.

Line protection

The relay is a non-directional overcurrent relay which can be used for line protection of high and medium-voltage networks with earthed (grounded), low-resistance grounded, isolated or compensated neutral point.

Motor protection

When protecting motors, the 7SJ61 relay is suitable for asynchronous machines of all sizes.

Transformer protection

The relay performs all functions of backup protection supplementary to transformer differential protection. The in suppression effectively prevents tripping by in currents. The high-impedance restricted ground-fault protection detects short-circuits and insulation faults on the transformer.

Backup protection

The 7SJ61can be used universally for backup protection.

Flexible protection functions

By configuring a connection between a standard protection logic and any measured or derived quantity, the functional scope of the relays can be easily expanded by up to 20 protection stages or protection functions.

Metering values

Extensive measured values, limit values and metered values permit improved system management.

Protection functions

Overcurrent protection (definite-time/inverse-time/user-def.)

Sensitive earth-fault detection

Intermittent earth-fault protection

High-impedance restricted earth fault

In-current detection

Motor protection

Undercurrent monitoring

Starting time supervision

Restart inhibit

Locked rotor

Load jam protection

Overload protection

Temperature monitoring

Breaker failure protection

Negative-sequence protection

Auto-reclosure

Lockout

Control functions/programmable logic

Commands for control of a circuit-breaker and of isolators

Position of switching elements is shown on the graphic display

Control via keyboard, binary inputs, DIGSI 4 or SCADA system

User-defined logic with CFC (e.g. interlocking)

Monitoring functions

Operational measured values

Circuit-breaker wear monitoring

Slave pointer

Time metering of operating hours

Trip circuit supervision

8 oscillographic fault records

Motor statistics

Communication interfaces

System interface

IEC 60870-5-103, IEC 61850

PROFIBUS-DP

DNP 3.0/MODBUS RTU

Service interface for DIGSI 4 (modem)

Front interface for DIGSI 4

Time synchronization via IRIG B/DCF77

Hardware

4 current transformers

3/8/11 binary inputs

4/8/6 output relays