Motor protection

Main function:

• Motor protection for small to medium-sized motors (100 KW to 2 MW).
• Certification for use in explosive environments (EN 60079-14 or Verband der Elektrotechnik, Elektronik und Informationstechnik 0165, Part 1, ATEX)

Inputs and outputs:

• 4 current transformers,
• 4 voltage transformers (optional),
• 11 or 23 binary inputs, 
• 9 or 16 binary outputs, 
• 12 RTD inputs (optional)

Hardware flexibility:

• Different hardware quantity structures for binary inputs and outputs are available in the 1/3 base module. Adding 1/6 expansion modules is not possible; available with large or small display.

Width of housing:

• 1/3 × 19 inches

As standard:

• Conformal coating

DIGSI 5 permits all functions to be configured and combined as required.

• Motor protection functions: Startup time monitoring, thermal overload protection for stator and rotor, restart inhibit, unbalanced-load protection, load-jam protection 
• Stator and bearing temperature monitoring via temperature sensors with optional temperature inputs or with external RTD unit. 
• Sensitive ground-fault protection (non-directional, directional) to detect stator ground faults 
• Directional and non-directional overcurrent protection (short- circuit protection) with additional functions 
• Detection of ground faults of any type in compensated or isolated electrical power systems using the following functions: 3I0>, V0>, transient ground fault, cos φ, sin φ, harmonic, dir. Detection of intermittent ground faults and admittance 
• Ground fault detection using the pulse detection method 
• Overvoltage and undervoltage protection
  
• Arc protection
• Power protection, configurable as active or reactive power protection
• Detection of current and voltage signals up to the 50th harmonic with high accuracy for selected protection functions (such as thermal overload protection) and operational measured values
• Control, synchrocheck and switchgear interlocking protection
• PQ-Basic: voltage unbalance; voltage changes: overvoltage, dip, interruption; TDD, THD and Harmonics
• Graphical logic editor to create powerful automation functions in the device
• Single line representation in small or large display
• Integrated electrical Ethernet RJ45 for DIGSI 5 and IEC 61850 (reporting and GOOSE)
• 2 optional pluggable communication modules, usable for different and redundant protocols (IEC 61850-8-1, IEC 60870-5-103, IEC 60870-5-104, Modbus TCP, DNP3 serial and TCP, PROFINET IO)
• Reliable data transmission via PRP and HSR redundancy protocols
• Extensive cybersecurity functionality, such as role-based access control (RBAC), protocolling security-related events, signed firmware or authenticated network access IEEE 802.1X
• Simple, quick and secure access to the device via a standard Web browser to display all information and diagnostic data, as well as vector diagrams, single-line and device display pages
• Secure serial protection data communication, also over great distances and all available physical media (optical fiber, two-wire connections and communication networks)
• Capturing operational measured variables and protection function measured values for the evaluation of the systems, to support commissioning, and to analyze faults
• Integrated RTD inputs (optional) for thermal motor monitoring
• Phasor Measurement Unit (PMU) for synchrophasor measured values and IEEE C37.118 protocol
• Powerful fault recording (buffer for a max. record time of 80 sec. at 8 kHz or 320 sec. at 2 kHz)
• Auxiliary functions for simple tests and commissioning.

• Protection against thermal overload of the stator from overcurrent, cooling problems or pollution
• Protection against thermal overload of the rotor during startup due to frequent startups, excessively long startups or blocked rotor
• Monitoring for voltage unbalance or phase outage
• Monitoring the thermal state and the bearing temperatures with  temperature measurement
• Detection of idling drives of pumps and compressors, for example
• Detection of ground faults in the motor
• Protection against motor short circuits
• Protection against instability due to undervoltage
• Acquisition and recording of power quality data in the medium voltage and subordinate low voltage network

• Compact and low-cost motor protection
• Safety due to powerful protection functions
• Purposeful and easy handling of devices and software thanks to a user-friendly design
• Cybersecurity in accordance with NERC CIP and BDEW Whitepaper requirements
• Highest availability even under extreme environmental conditions by “conformal coating“ of electronic boards
• Full compatibility between IEC 61850 Editions 1, 2.0 and 2.1