- Comprehensive Generator Protection
Numerous current, voltage, frequency, distance, power, and out-of-step elements provide comprehensive protection for large, medium, and small generators.
- Autosynchronizer
The optional, built-in automatic synchronizer function eliminates the need for expensive external synchronizer equipment. Frequency, voltage, and phase control of the generator are automatically synchronized and connected to the power system.
- Easy Communications
Choose from single or dual ports, copper or fiber-optic Ethernet or serial communications, and several protocols, including Mirrored Bits communications and IEC 61850. Pick multiple Modbus TCP or Modbus serial sessions for custom configuration of your application. Use DNP3 serial or DNP3 LAN/WAN protocol.
- One Hundred Percent Stator Ground Detection
The SEL-700G detects stator ground faults on high-impedance grounded generators using a conventional neutral-overvoltage element with a third-harmonic voltage differential detection scheme for 100 percent stator winding coverage.
- Current Differential Protection
Optional current differential elements detect stator faults using a secure, sensitive current differential function. Power transformer and CT connection compensation allows the unit step-up transformer to be included in the generator differential zone.
- Power Elements
Sensitive power elements protect against reverse power, overload conditions, or low forward power.
- RTD-Based Thermal Protection
Use an internal 10 RTD input card or an external SEL-2600 RTD Module to acquire thermal data for alarm, monitoring, and trip functions in the SEL-700G.
- Metering and Reporting
View generator autosynchronizer, Sequential Events Recorder (SER), and 180-cycle oscillographic event reports to analyze generator startup, shutdown, or system faults. Measure electrical, thermal, and generator run-time quantities.
- Synchrophasor Data
Apply SEL synchrophasors (IEEE C37.118) to turn state estimation into state measurement and to provide early warning of potential system instability. The SEL-700G phasor measurement accuracy meets the IEEE C37.118-2005 Level 1 requirement.