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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Control The relay permits circuit-breakers to be opened and closed without command feedback. The surface-mounting version has terminals accessible from the front. In order to detect the unbalanced load, the ratio of manaul phase-sequence current to rated current is evaluated. 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 with the negative-sequence protection.


This can compensate for initial inrush when energizing a circuit without compromising the sensitivity of the overcurrent elements during steady state conditions. Asymmetric short-circuits with currents that can be smaller than manua, largest possible load currents or phase interruptions are reliably detected.


In this way, equipment such as motors can be protected against asymmetric and excessive loading. Jack Sheldon standards development with responsibility, amongst others, for the creation. Available inverse-time characteristics Characteristics acc. After the set time has expired, the pickup settings automatically return to their original setting.

This is selectable via a jumper inside the relay. Interruptions, short-circuits or crossed connections to the current transformers are detected.

Overcurrent Protection / 7SJ600

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. This can occur, for example, if the rotor is blocked, if excessive voltage drops occur when the motor is switched on 7sj600 if excessive load torques occur.

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

Siemens SIPROTEC 7SJ600 Instruction Manual

If the control switch is connected to a circuit-breaker bypassing the internal control function, manual detection using a binary input is implemented. In this case, reverse interlocking provides high-speed busbar protection in radial or ring power systems that are opened at one point. Fort Hood 7dj600 Advertisement.


Furthermore, low level single-phase and two-phase short-circuits such as faults beyond a transformer as well as 7sj6000 interruptions can be detected. If the internal control function is used local or via serial interfacethe manual closing function is available without any additional wiring.

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Overcurrent Protection / 7SJ

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 kanual to less sensitive settings for a programmable duration of time.

The tripping time t is calculated in accordance with the following tripping characteristic complete memory in accordance with IEC The tripping time depends on the current.

Intentional trip delays can be parameterized from 0.

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