Siemens Siprotec 4 SIPROTEC 7VE6 Paralleling Device

Siemens Siprotec 4 Siprotec 7VE6 Multifunction Paralleling Device

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 7VE61 paralleling device is a 1-channel unit (paralleling function + synchro-check) for use with small to medium-size generators and power systems. It is more reliable than 1-channel paralleling devices. It can also be used for synchro-check, with parallel operation of three synchronization points.For larger generators and power systems withhigh reliability requirements, the 2-channel 7VE63 is recommended. Two independent methods decide on the connection conditions. The unit also has the full control functions of the SIPROTEC 4 family.Voltage and frequency functions including voltage vector jump (??) are optionally available for protection or network decoupling applications.The integrated programmable logic functions (continuous function chart CFC) offer the user a high flexibility so that adjustments can easily be made to the varying requirements on the basis of special system conditions.The flexible communication interfaces are open to modern communication architectures with control systems.

SIPROTEC 7VE6 Paralleling Device BASIC FUNCTIONS

• High reliability with a two-out-of-two design (1 ? channels in 7VE61 and 2 channels in 7VE63)
• Paralleling of asynchronous voltage sources
• Balancing commands for voltage and speed (frequency)
• Paralleling of synchronous voltage sources
• Synchro-check function for manual synchronization
• Parameter blocks for use on several synchronizing points (7VE61 max. 4 and 7VE63 max. 8)

SIPROTEC 7VE6 Paralleling Device ADDITIONAL FUNCTIONS

• Consideration of transformer vector group and tap changer
• Synchronization record (instantaneous or r.m.s. record)
• Commissioning support (CB-time measurement, test synchronization)
• Browser operation
• Full control functionality of SIPROTEC 4
• Analog outputs of operational measured values
• Functions for protection or network decoupling tasks

PROTECTION FUNCTIONS (OPTION)

• Undervoltage protection(27)
• Overvoltage protection (59)
• Frequency protection (81)
• Rate-of-frequency-change protection (81R)
• Jump of voltage vector monitoring

MONITORING FUNCTIONS

• Self-supervision of paralleling function
• Operational measured values
• 8 oscillographic fault record

COMMUNICATION INTERFACES

• System interface
  – IEC 60870-5-103
  – IEC 61850 protocol
  – PROFIBUS-DP
  – MODBUS RTU and DNP 3.0
• Service interface for DIGSI 4 (modem)
• Front interface for DIGSI 4
• Time synchronization via IRIG B/DCF77

SIPROTEC 4 leads the way in integrating protection, control, measurement, and automation functions in one device. The homogenous system platform, the unique DIGSI 4 engineering program, and extensive experience of more than a million successfully operating devices in the field worldwide – thanks to these unique advantages, SIPROTEC 4 enjoys top recognition among users worldwide. SIPROTEC 4 is the industry standard for digital protection technology today in all fields of application.