NA20

NA20 Feeder Protection Relay

The NA20 protection relay ensures ssafety of radial networks. In solidly grounded systems, it provides protection against faults on lines of any length. In isolated or Petersen coil and/or resistance grounded systems, it ensures protection on shorter lenghts, to avoid unwanted trippings due to the capacitive current contribution of the feeder on external ground fault.

Features of the NA20 Protection Relay

Thytronic NA20 protection relay provides advanced protection features such as thermal imaging to ensure the safety of lines and power transformers, Undercurrent protection for monitoring of circuit breaker opening,, and negative sequence protection against asymmetrical short circuits and unbalanced loads,. Additionally, the I2/I1 protection functions allow intervention in phase interruptions under low-load conditions.

FUNCTIONS

STANDARD PROTECTIVE & CONTROL ELEMENTS

Phase overcurrent side H and side L - 50/51
Maximum Residual Overcurrent - 50N/51N(1)
Breaker Failure - BF
CT Supervision - 74CT
Trip Circuit Supervision - 74TCS
Under Current - 37
Thermal Image Transformer - 49LT
Negative sequence overcurrent - 46
Negative sequence overcurrent - 46LT
Sequence of Fault Recorder (SFR)
Sequence of event Recorder (SER)

SW PACK OPTIONAL CONFIGURATION

Digital Fault Recorder (DFR)

HW PACK OPTIONAL CONFIGURATION

Thermal with Pt100 Probes - 26

COMMUNICATION FUNCTIONS

Modbus TCP-IP
One USB Type B local port for communication with ThyVisor setup software
Modbus protocol RTU RS485 / IEC 870-5-103 / DNP3

DOWNLOADS

Flyer NA20

Manual NA20

RELATED PRODUCTS

NA21

The NA21 protection relay ensures safety of radial networks In solidly grounded systems, it provides reliable protection against faults on lines of any length. In isolated or Petersen coil and/or resistance grounded systems, it offers protection on shorter lenghtsto avoid unwanted interventions to the

capacitive current contribution of the feeder on external ground fault.

Features of the NA21 Protection Relay

In addition to phase and residual overcurrent protection, the following features are included:

Thermal imaging for line and transformer protection,
Undercurrent protection for monitoring of Circuit Breaker opening.
Negative sequence protection against asymmetrical short circuits and unbalance loads.,
I2/I1 protection against phase interruptions (interruption with reduced load line),
Automatic Reclosing

The NA21 relay also integrates thermal imaging for the protection of lines and transformers. With optional hardware and software configurations, features such as temperature measurement using Pt100 thermometric probes can be included. For communication and configuration, the NA21 relay is equipped with a Type B USB port to connect to the ThyVisor configuration software, allowing easy and fast configuration and system management.

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XMR-A

XMR-A is part of the XMORE platform, the comprehensive range of IEDs for medium voltage applications that includes protection for feeders, motors, generators, transformers, and capacitor banks. The Thytronic XMR-A IED complies with CEI-016 standards. Thanks to its hardware and software modularity, XMR-A is flexible and scalable in terms of applications and performance.

Features of the XMR-A Protection Relay

The XMR-A relay is used in power distribution grids with any state of the neutral (insulated, earthed with high or low resistance, earthed with Petersen coil (compensated neutral) and any resistance, directly connected to earth) for the following typical applications:

protecting radial lines, transformers
as a CEI 0-16 certified General Protection System (SPG) for active or passive users connected to the public distribution network, with possible directional earth protection 67N (with optional HW package).

The following measurement circuits are present:

Versions with inputs from CT
Three phase currents with rated current independently selectable at 1A or 5 A via software
One residual current input with rated current selectable at 1A or 5 A via software.

Optionally:

One additional residual current input with rated current selectable at 1A or 5 A via software.

A residual voltage input, with rated voltage programmable in the range 50...130V (UEn = 100V)

To integrate the protection functions, there are the functions of failure to open the circuit-breaker (BF), CT monitoring (74CT), VT monitoring (74VT), trip circuit monitoring (74TCS), synchronism control and programmable logic (PLC).

The methods of calibration, programming and reading of the measurements and recordings can be implemented through Personal Computer with Software support ( ThyVisor) or via bus RS485 or Ethernet communication; all the above operations are possible using the keyboard frontal view (MMI).

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