View and Download Siemens SIPROTEC 7SJ instruction manual online. numerical overcurrent, motor and overload relay. SIPROTEC 7SJ Relays pdf . 5/19 SIPROTEC 7SJ numerical overcurrent, motor and overload . bypassing the internal control function, manual detection using a binary input is. 5 OvercurrentProtection/7SJ 5. 5/19 The SIPROTEC 7SJ is a numerical overcurrent relay which, in . function, manual detection using a binary.

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Cold load pickup By means of a binary input which can be wired from a manual close contact, it is possible to switch the overcurrent pickup settings to less sensitive settings for a programmable duration of time.

After the set time has expired, the pickup settings automatically return to their original setting. The surface-mounting version has terminals accessible from the front. This can compensate for initial inrush when energizing a circuit without compromising the mamual of the overcurrent elements during steady state conditions.

SIPROTEC 4 Downloads

In this case, reverse interlocking provides high-speed busbar protection in radial or ring power systems that are opened at one point. Available inverse-time characteristics Characteristics acc. This manua, occur, for example, if the rotor is blocked, if excessive voltage drops occur when the motor is switched on or if excessive load torques occur.


Interruptions, short-circuits or crossed connections to the current transformers are detected. In order to detect the unbalanced 7sj00, the ratio of negative phase-sequence current to rated current is evaluated.

Overcurrent Protection / 7SJ

If the control switch is connected to a circuit-breaker bypassing the internal control function, manual detection using a binary input is implemented. Asymmetric short-circuits with currents that can be smaller than the largest possible load currents or phase interruptions are reliably detected. The tripping time t is calculated in accordance with the following tripping characteristic complete memory in accordance with IEC Furthermore, low level single-phase and two-phase short-circuits such as faults beyond a transformer as well as phase interruptions can be detected.

The unit has been developed and manufactured for application in an industrial environment according to the EMC standards. Parameters are assigned to decide whether the input circuit is to operate in open-circuit or closed-circuit mode. The tripping time depends on the current.


Jack Sheldon standards development with responsibility, amongst others, for the creation. Intentional trip delays can be parameterized from 0. Low-current single-phase faults on the low voltage side that result in negative phase-sequence current on the high-voltage side can be detected 7sn600 the negative-sequence protection.

In this way, equipment such as motors can be protected against asymmetric and excessive loading. Control The relay permits circuit-breakers to be opened and closed without command feedback.

Fort Hood Sentinel Advertisement. This is selectable via a jumper manuao the relay. If the internal control function is used local or via serial interfacethe manual closing function is available without any additional wiring. The reverse interlocking principle is used, for example, in medium-voltage power systems and in switchgear for power plants, where a high-voltage system transformer feeds a busbar section with several mediumvoltage outgoing feeders.

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