Thytronic NA011
Feeder protection relay with phase and residual overcurrent, automatic reclosing and breaker failure protection.
The Thytronic NA011 is a feeder protection relay that guards medium voltage lines and transformers against phase and earth faults, with automatic reclosing and breaker failure protection. This Modbus RTU template reads the phase and residual currents, breaker position, trip flags and counters, and lets you change protection settings, operate the breaker and send store and reset commands from ModbusCloud.
- Protocol
- Modbus RTU
- Connection
- RS485, 9600 baud
- Registers
- 106, read and write
- Brand
- Thytronic
- Key readings
- Phase currents · Residual current · Breaker position · Trip flags · Autoreclose state · Start, trip and reclose counters · Self-test status
- Available commands
- Overcurrent thresholds · Time curves and operate times · Cold load pickup · Breaker open and close · Autoreclose on and off · Store, reset and test commands
- Compatible models
- NA011
- Last updated
Registers (106)
100 read, 60 write
| Name | Unit | Access | Address (Hidden until you enter your email) | Function (hidden) | Type (hidden) |
|---|---|---|---|---|---|
| Phase Current L1 | A | Read | |||
| Phase Current L2 | A | Read | |||
| Phase Current L3 | A | Read | |||
| Residual Current | A | Read | |||
| Protection Trip Flags | Read | ||||
| Breaker Position | Read | ||||
| Input IN1 | Read | ||||
| Input IN2 | Read | ||||
| Input IN3 | Read | ||||
| Autoreclose Active | Read | ||||
| Self-Test Level | Read | ||||
| Oscillography Recorder State | Read | ||||
| Settings Command | Write | ||||
| Reset Command | Write | ||||
| Breaker Command | Write | ||||
| Autoreclose Command | Write | ||||
| Test Command | Write | ||||
| Recorded Data Default Command | Write | ||||
| Modbus Address | Read and write | ||||
| RS485 Protocol | Read and write | ||||
| RS485 Baud Rate | Read and write | ||||
| Measurement Reading Mode | Read and write | ||||
| Phase CT Primary Current | A | Read | |||
| Residual CT Primary Current | A | Read | |||
| Fault Record Select | Read and write | ||||
| Event Record Select | Read and write | ||||
| I> Time Curve | Read and write | ||||
| I> Inverse Pickup (x In) | Read and write | ||||
| t> Inverse Time Setting | s | Read and write | |||
| I> Definite Pickup (x In) | Read and write | ||||
| t> Definite Operate Time | s | Read and write | |||
| t> Reset Time | ms | Read and write | |||
| I> Cold Load Mode | Read and write | ||||
| I> Cold Load Time | s | Read and write | |||
| I> Definite Cold Load Pickup (x In) | Read and write | ||||
| I> Inverse Cold Load Pickup (x In) | Read and write | ||||
| I>> Pickup (x In) | Read and write | ||||
| t>> Operate Time | s | Read and write | |||
| t>> Reset Time | ms | Read and write | |||
| I>> Cold Load Mode | Read and write | ||||
| I>> Cold Load Time | s | Read and write | |||
| I>> Cold Load Pickup (x In) | Read and write | ||||
| I>>> Pickup (x In) | Read and write | ||||
| t>>> Operate Time | s | Read and write | |||
| t>>> Reset Time | ms | Read and write | |||
| I>>> Cold Load Mode | Read and write | ||||
| I>>> Cold Load Time | s | Read and write | |||
| I>>> Cold Load Pickup (x In) | Read and write | ||||
| IE> Time Curve | Read and write | ||||
| IE> Inverse Pickup (x IEn) | Read and write | ||||
| tE> Inverse Time Setting | s | Read and write | |||
| IE> Definite Pickup (x IEn) | Read and write | ||||
| tE> Definite Operate Time | s | Read and write | |||
| tE> Reset Time | ms | Read and write | |||
| IE> Cold Load Mode | Read and write | ||||
| IE> Cold Load Time | s | Read and write | |||
| IE> Definite Cold Load Pickup (x IEn) | Read and write | ||||
| IE> Inverse Cold Load Pickup (x IEn) | Read and write | ||||
| IE>> Time Curve | Read and write | ||||
| IE>> Inverse Pickup (x IEn) | Read and write | ||||
| tE>> Inverse Time Setting | s | Read and write | |||
| IE>> Definite Pickup (x IEn) | Read and write | ||||
| tE>> Definite Operate Time | s | Read and write | |||
| tE>> Reset Time | ms | Read and write | |||
| IE>> Cold Load Mode | Read and write | ||||
| IE>> Cold Load Time | s | Read and write | |||
| IE>> Definite Cold Load Pickup (x IEn) | Read and write | ||||
| IE>> Inverse Cold Load Pickup (x IEn) | Read and write | ||||
| Breaker Failure Triggers | Read and write | ||||
| Breaker Failure Time | s | Read and write | |||
| Input IN1 Function | Read and write | ||||
| Input IN2 Function | Read and write | ||||
| Input IN3 Function | Read and write | ||||
| Autoreclose Enable | Read | ||||
| Autoreclose Triggers | Read and write | ||||
| Relay K1 Functions | Read | ||||
| Relay K2 Functions | Read | ||||
| Relay K3 Functions | Read | ||||
| Relay K4 Functions | Read | ||||
| Enable TX Delay | ms | Read | |||
| Oscillography Pre-Trigger | Read | ||||
| Start Count I> | Read | ||||
| Start Count I>> | Read | ||||
| Start Count I>>> | Read | ||||
| Start Count IE> | Read | ||||
| Start Count IE>> | Read | ||||
| Trip Count I> | Read | ||||
| Trip Count I>> | Read | ||||
| Trip Count I>>> | Read | ||||
| Trip Count IE> | Read | ||||
| Trip Count IE>> | Read | ||||
| Trip Count External | Read | ||||
| Rapid Reclose Count | Read | ||||
| Slow Reclose Count | Read | ||||
| Delayed Reclose Count | Read | ||||
| Failed Reclose Count Phase | Read | ||||
| Failed Reclose Count Earth | Read | ||||
| Failed Reclose Count External | Read | ||||
| Faults Stored | Read | ||||
| Selected Fault Number | Read | ||||
| Events Stored | Read | ||||
| Selected Event Number | Read | ||||
| Oscillography Records Stored | Read | ||||
| Clock Year | Read | ||||
| Device Identification | Read | ||||
| Product Code | Read |
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Send your device list
If a device is not in the library yet, we build the template for free as soon as we have the register data.
Use cases
- Show the phase and residual currents of each feeder on a dashboard and keep a year of history per value.
- Send an e-mail or webhook alert as soon as the trip flags rise above zero.
- Follow the reclose and failed reclose counters to see how often a line sees transient or lasting faults.
- Check the overcurrent thresholds and curves remotely and adjust them during commissioning.
- Get an alert when the breaker position changes to alarm or the self-test reports a problem.
Installation
Wire the rear RS485 port of the NA011 to the RS485 port of the ModbusCloud Gateway, A to A and B to B, and terminate the bus at both ends with 120 Ω.
On the relay, open the Communication menu, set the RS485 protocol to Modbus and note the address and baud rate (default 1 and 9600 baud).
In ModbusCloud, add a Modbus device on the RS485 port of the Gateway with the same address, 9600 baud, 8 data bits, no parity and 1 stop bit.
Import the Thytronic NA011 template and check that the phase currents and the breaker position come in.
Compare the currents with the relay display, and set the CT primary currents on the relay if you read primary amps.
Things to watch for
The Gateway gets no answer from the NA011. What should I check?
Check that the RS485 protocol on the relay is set to Modbus and not IEC 60870-5-103, that the address and baud rate match the device in ModbusCloud, and that A and B are not swapped. Terminate the bus with 120 Ω at both ends.
The currents do not match the relay display. Why?
With the default Reading Direct the relay reports primary amps, calculated from the phase and residual CT primary currents set under Set, Base. With Reading Relative it reports multiples of the rated current. Check both settings on the relay and compare again.
I wrote a new threshold, but it is gone after a restart. Why?
The NA011 keeps changed settings in temporary memory until it receives the store command. After writing new values, write Store to the Settings Command register, or Clear to discard the changes. Read a setting first before you write it, so you know the current value.
Some values stay empty while the currents come in. Is that normal?
The clock, the identification, the autoreclose state and the fault and event records are part of larger messages that the relay may only send as a whole. The template fits NA011 relays with identification code 105 or 106; older relays with codes 101 to 104 use a different layout.
Can a command from ModbusCloud open the circuit breaker?
Yes. Breaker Command opens or closes the breaker through the output relays assigned to CB Open and CB Close, and a test with trip operates the output relays. Only use them during commissioning or maintenance with the feeder in a safe state.
Want to see how it works?
