ZIV e-NET FLEX Protection & Control Relays

Complete and Reliable Solutions for Digital Transmission and Distribution Substations

Modular, Flexible & Cybersecure Protection IEDs designed to meet the most demanding requirements in each Application Field

HV Lines / Transformers / Busbars and Breakers / Feeders / Motors / Bay Control Applications / Grid Automation



General characteristics of the Flex Family

  • Powerful programable logic. 9 2000 event log. Up to 100 oscillography seconds.
    Alphanumeric or graphic display.
  • 160 DI, 80 DO, and 22 LEDs.
  • Bonding, RSTP, PRP and HSR Redundancy.
  • IEC 61850 Ed.2, DNP3.0, Modbus RTU and PROCOME Protocols.
  • Native process bus. Analog input cards operate as Merging Units for the CPU.
  • Synchronized samples at 4800 Hz (as per IEC 61869-9).
  • Cybersecurity in accordance with IEC 62351, IEC 62443 and IEEE 1686-2013 standards. RBAC, secure keys, physical and logical port disabling, cybersecurity event log, securing of management protocols (PROCOME, HTTPS, SFTP, SSH), remote authentication (LDAP, RADIUS) and digital firmware securitization.
  • Time synchronization by IRIG-B, SNTP and PTP (Ordinary Clock / Transparent Clock).


Download now the Flex Family Protection Relays leaflet PDF

All about the Cybersecurity functionality on the Flex Family Protection Relays 

IRF – Modular Feeder Protection Relay IEC 61850 2

Protection relay for distribution feeders, transformers and generators, transmission line backup, and BCU (bay control unit). IEC 61850 Certified ed 2. The IRF is applicable in any substation scheme. The protection functions are suitable for any neutral configuration, solid-grounded, resistor grounded, Petersen coil compensated, and isolated. The powerful programmable logic features selectable execution times according to the required priority (2 [...]

DLF – Line Differential Protection Relay IEC 61850

Line Differential Protection with Distance Backup. Both functions are suitable for lines of any Voltage Level, Overhead or Under Ground, Multiterminal, and Single or Parallel Circuits The DLF includes all the protection, control and measurement functions for a power line with or without Series Compensation, Single Breaker, and Single or Three Pole Tripping. The fast Differential Unit, complemented by the [...]

IDF – Transformer Protection Relay IEC 61850 2

Protection relay for two or three winding transformer or autotransformer, of any voltage level, with single or double circuit breaker. IEC 61850 Certificate ed 2 Suitable for phase-shifting transformers, Scott or Leblanc transformers. The IDF is applicable as a differential protection for reactances, SVCs, generators and motors. A fast differential unit, complemented by advanced blocking and harmonic restraint logics and an external [...]

ZLF – Distance Protection Relay IEC 61850 2

Subcycle distance protection suitable for lines of any voltage level with any configuration: overhead or underground, single or parallel circuits The ZLF includes all the protection, control and measurement functions for a power line, with or without series compensation, single or double breaker, and single pole or three pole tripping. Eight distance zones with Mho or quadrilateral characteristic, complemented with [...]

RTF – (AVR) Automatic Voltage Regulator – IEC 61850

Automatic voltage regulation (AVR) for up to 5 power transformers in parallel. Parallel transformer regulation by master-slave, circulating current and negative reactance methods. It also includes line voltage drop compensation. AVR Key Features Voltage Regulation. Maintains the transformer output voltage at the setpoint value, calculating the difference between the measured voltage and the setpoint voltage and comparing it with a threshold [...]

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