Syncrocloser® Digital Synchronizing System

Integrated Synchronizing System™ for Generator and Intertie Synchronizing

  • Facilitates standardization for generator and system intertie sync check applications
  • Assure safe and accurate connection of a generator to the power network
  • Provides accuracy and independent controls; no additional instrumentation is required for field setting
  • Breaker closing times are field programmable
  • Local and remote serial communications (MODBUS protocol) capability for monitoring and control functions

The M-5625 Syncrocloser Digital Synchronizing System is suitable for the automatic synchronizing of a generator to the electric power network. The system provides speed and voltage "jogs" to bring a generator to proper conditions of matching voltage and frequency, prior to safely and accurately closing a breaker into a bus energized by an electric power network.

The Digital Synchronizing System is intended for three general classes of application:

  • Initial connection of a generator to a power network
  • Closure of a network breaker where there is a possibility of a split of the system into two isolated networks having different frequencies
  • Breaker closure applications with a static phase angle
  • Automatic Synchronizing
  • The system can also be used for manual synchronizing application.

Digital Synchronizing System

When the M-3410A relay is connected with Line-Line voltage input, the following functions are available (refer to the Specification for wiring connections).

  • SyncCheck with Phase Angle, DV and DF with dead line/dead bus options (25)
  • Reconnect enable (79) for intertie application
  • Phase undervoltage (27) detection
  • Dual-setpoint, single or three phase, directional power monitoring that can be selected as over power or under power (32) detection (requires current transformer input)
  • Negative sequence overvoltage (47) detection
  • Phase overcurrent (51) detection (requires current transformer input)
  • Phase overvoltage (59) detection
  • VT fuse-loss detection and blocking (60FL)
  • Four-step over/under frequency (81) detection

If a line-neutral is applied to the single VT input of the M-3410A only the Synch-Check (25) Function is viable. The (51) Function may also be active for this voltage configuration if current input is connected as well.

Standard Features

  • Selectable Anti-Motoring and Anti-Pump
  • Adjustable Jog Durations, proportional to error, for Voltage and Speed Controls
  • Time Between Jogs adjustments bring the generator to a matched condition in minimum time and eliminate overshoot and hunting by accounting for inertial and control lags
  • Kicker Pulse brings phase angle around through zero if speed is matched but synchronism has not yet occurred. Adjustable pulse duration compensates for the sensitivity of the governor.
  • One Auto-sync output, two SyncCheck outputs, one self-test output, two enable inputs, and two control/status inputs
  • Oscillographic recording (COMTRADE file format)
  • Time-stamped sequence of events recording for 32 events
  • Metering of Voltage, Delta Voltage, Frequency, Delta Frequency, Phase Angle, Current and Sync Scope indication
  • One RS-232 port (COM1) on front and one RS-232 or 485 port (COM2) on rear
  • M-3810A IPScom® For WindowsTM Communications Software
  • MODBUS protocol
  • Supports both 50 and 60 Hz applications
  • Accepts 1A or 5 A rated CT inputs
  • Continuous Self-Diagnostics

Optional Features

  • M-3801D IPSplot® PLUS Oscillograph Analysis Software
  • Horizontal and Vertical panel mount versions available
  • Standard 19" Rack Mount Available


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