NC020

NC020 Capacitor Bank Protection Relay

In recent years, the portion of the total load that produces harmonics has steadily increased due to the massive use of power electronics at all voltage levels. Thyristor converters, frequency converters, switching thyristors, and static compensators, such as Thyristor-Controlled Reactors (TCR) and Thyristor-Switched Capacitors (TSC), are commonly adopted in industrial applications and electrical utilities.


Capacitor bank filters consist of capacitor batteries and an air core connected in series, whose task is to absorb the harmonic currents generated by loads and all the above-mentioned power electronic devices. The purpose of the NC020 protection relay is to provide reliable protection for such an application, ensuring the system's safety.

Features of the NC020 Capacitor Bank Protection Relay


The Thytronic NC020 protection relay is designed to ensure reliable protection for capacitor banks. Its key functions include detection of breaker failure, monitoring of negative sequence overcurrent of the transformer, and control of the maximum voltage and phase current. This relay supports the Modbus RTU RS232 communication protocol.

FUNCTIONS


STANDARD PROTECTIVE & CONTROL ELEMENTS

  • Negative sequence overcurrent - 46LT
  • Phase overcurrent side H and side L - 50/51
  • Breaker Failure - BF
  • Sequence of Fault Recorder (SFR)
  • Sequence of event Recorder (SER)
  • Under Current - 37
  • Maximum Residual Overcurrent - 50N/51N(1)

SW PACK OPTIONAL CONFIGURATION

  • Digital Fault Recorder (DFR)

COMMUNICATION FUNCTIONS

  • Modbus RTU RS232 protocol
  • Modbus protocol RTU RS485 / IEC 870-5-103 / DNP3

DOWNLOADS

NC020 Coding
Flyer NC020
NC020 Manual

RELATED PRODUCTS

NC20

The NC20 protection relay can be used to protect shunt capacitor banks and harmonic filter circuits. The capacitor banks can have the following configuration:

  • Single Wye grounded.
  • Single Wye ungrounded (with a resistor on the output of the neutral unbalance voltage transformer in order to develop the appropriate input current for the unbalance protection)
  • Double Wye ungrounded.
The capacitor banks may be: internally/externally fused or fuseless capacitor units.The protections are equipped with a system for compensating inherent unbalance neutral current
  • Protections 37, 49, and 50/51 (RMS) are based on the measurement of the true RMS value of the three phase currents (fundamental and harmonics up to the11th). 

Features of the NC20 Capacitor Bank Protection Relay


Among the functions of the Thytronic NC20 relay, we find the monitoring of under voltage and under current, along with the control of the negative sequence overcurrent r, phase overcurrent, and maximum residual overcurrent, in addition to the supervision of overvoltage and detection of breaker failure.

The relay is capable of monitoring the phase current transformers and supervising the trip circuit to ensure reliable operation. Additionally, it optionally offers a hardware (HW PACK) and software (SW PACK) package for advanced configurations.
Regarding communication functions, it is equipped with a type B USB port for easy connection to the ThyVisor configuration software.

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