The digital protection for catenary feeder PDZI_N protects the fixed installations of electric traction, in charge of feeding catenaries with 25 kV or 2 X 25 kV, 50 or 60 Hz voltages.
The PDZIN1 also features functions that help network operation: fault locator, assistance to the maintenance of the circuit breakers, disturbance recording. An optional recloser with 4 cycles is available.
As well as the usual functions of protection, PDZIN1 relay provides monitoring, measurement and recording of the electrical quantities of the network. The relays can be set locally, using either the keypad or the RS232 port, or remotely using the RS485 port. The setting, reading, measuring and recording are all available locally or remotely.

CONTROL   AND   PROTECTION   FUNCTIONS

• 3 downstream and 2 upstream zones of minimum of impedance protection [21]
• 2 phase thresholds of overcurrent protection [50] [51], with two switchable modes
• 2 thresholds of directional protection [67]
• Overcurrent [51] de-icing protection
• Under-voltage protection [27]
• Circuit breaker failure protection [50BF]
• Fault locator
• 4 cycles recloser [79] (option)
  

MAIN   FEATURES

• Configuration and parameter setting by local MMI or off-line / on-line PC
• Measurement of electrical quantities:
  – Catenary, feeder and de-icing currents
  – Catenary voltage
  – Resistance, reactance, impedance and angle of the line
  – Harmonic ratio H2 and H3
• Definite and dependent time tripping according to inverse, very inverse and extremely inverse IEC 60255-4 curves
• Minimum of impedance protection, type parallelogram, with 3 downstream zones and 2 upstream zones
• 2 setting groups, locally or remotely selectable by digital input or by the communication channel
• Self-diagnosis: memories, output relays, A/D converters, auxiliary supply, cycles of execution of software, hardware failure
• 2 tripping and 12 signalling outputs
• 12 dedicated digital input
• Event recording: 100 locally recorded events, retained in the event of loss of auxiliary supply
• Disturbance recording according to Comtrade® format: storage of eight 52 periods recordings
• Optional Communication by Modbus® RS 485