f Siemens Protection Relays SIPROTEC 4 Series SIPROTEC 7VK61- A&S Automation Co., Ltd
 
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  • A&S Automation Co., Ltd.
  • Address: 469 Xinsheng Road, Gaoxin District, Chengdu, China
  • Tel: +86-28-67198331
  • Fax: +86-28-86129221
  • Email: sensor@esmachinery.com
  • Contact Person: Ivy

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The 7VE61 and 7VE63 paralleling devices of the SIPROTEC 4 family are multifunctional compact units used for paralleling power systems and generators. Their technical design ensures highly reliable paralleling due to their 1-channel or 2-channel measurement method and their hardware design. This is supported by numerous monitoring functions. The units automatically detect the operating conditions. The response to these conditions depends on settings. In “synchronous network switching” mode, the frequency difference is measured with great accuracy. If the frequency difference is almost zero for a long enough time, the networks are already synchronous and a larger making angle is permissible. If the conditions are asynchronous, as is the case when synchronizing generators, the generator speed is automatically matched to the system frequency and the generator voltage to the system voltage. The connection is then made at the synchronous point, allowing for circuit-breaker make-time.The SIPROTEC 4 breaker management relay 7VK61 is a highly flexible autoreclosure, synchro-check and circuitbreaker failure protection unit. This unit is used for the single and threepole auto-reclosure of a circuit-breaker, after this circuit-breaker has tripped due to a fault. The synchro-check function ensures that the two circuits being reconnected by closing the circuit-breaker are within a defined safe operating state before the CLOSE command is issued. The 7VK61 is also applicable as circuitbreaker failure protection. A breaker failure occurs when the circuit-breaker fails to correctly open and clear the fault after single or three-pole trip commands have been issued by the protection. It is then necessary to trip the relevant busbar zone (section) to ensure fault clearance. Together with the above-mentioned protection functions, the following additional functions of the 7VK61 can be applied: end-fault protection, pole-discrepancy protection, overvoltage protection and undervoltage protection. As a member of the numerical SIPROTEC 4 relay family, it also provides control and monitoring functions and therefore supports the user with regard to a cost-effective power system management.

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Siemens Protection Relays SIPROTEC 4 Series SIPROTEC 7VK61- A&S Automation Co., Ltd

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