TIDUFK2 September   2026

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Terminology
    2. 1.2 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 Processing
      2. 2.2.2 Voltage and Current Sensing
        1. 2.2.2.1 Voltage Measurement
        2. 2.2.2.2 Current Measurement
      3. 2.2.3 Solenoid – Relay Driver
      4. 2.2.4 Temperature Measurement
    3. 2.3 Highlighted Products
      1. 2.3.1 CC2340R53
      2. 2.3.2 OPA2323
      3. 2.3.3 DRV8213
      4. 2.3.4 TMP236A2
  9. 3System Design Theory
    1. 3.1 Software Architecture
      1. 3.1.1 System Initialization
      2. 3.1.2 Sample Acquisition
      3. 3.1.3 Sample Processing and Task Prioritization
    2. 3.2 Circuit Breaker Functionality
      1. 3.2.1 Breaker State and Relay Control
      2. 3.2.2 Instantaneous Short-Circuit Trip
      3. 3.2.3 Inverse-Time Overload Trip
    3. 3.3 Electrical Metrology
    4. 3.4 Zigbee Connectivity
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
      1. 4.1.1 Hardware Connections and Test Points
    2. 4.2 Test Setup
      1. 4.2.1 Connecting the TIDA-011030 to the Metering Test Equipment
      2. 4.2.2 Power-Supply Options
      3. 4.2.3 Metrology Calibration
      4. 4.2.4 Test-Data Acquisition and Error Calculation
    3. 4.3 Test Results
      1. 4.3.1 Relay Control and Protection
        1. 4.3.1.1 Relay Pull-In and Holding PWM
        2. 4.3.1.2 Instantaneous Trip and Relay-Opening Latency
        3. 4.3.1.3 Inverse-Time Overload Trip
      2. 4.3.2 Metering
      3. 4.3.3 Real-Time Software Performance
      4. 4.3.4 Zigbee Functional Test
  11. 5Design and Documentation Support
    1. 5.1 Tools and Software
      1. 5.1.1 Tools
      2. 5.1.2 Software
    2. 5.2 Documentation Support
    3.     Trademarks
  12. 6About the Author

4.3.2 Metering

Table 4-4 RMS Current Measurement Error
Mean Reference Current Load (% of In) PF = 1PF = 0.5LPF = 0.8C Maximum Standard DeviationMaximum Absolute Relative Error
0.800110A5.0%+1.229%+1.261%+1.237%0.663mA1.261%
1.000100A6.25%+1.131%+1.159%+1.156%0.732mA1.159%
1.601712A10.0%+0.651%+0.683%+0.654%0.733mA0.683%
2.001274A12.5%+0.196%+0.231%+0.211%0.749mA0.231%
4.001386A25.0%-0.244%-0.223%-0.231%0.893mA0.244%
6.000832A37.5%-0.365%-0.345%-0.356%1.566mA0.365%
8.000929A50.0%-0.386%-0.374%-0.372%2.371mA0.386%
10.001415A62.5%-0.501%-0.483%-0.481%2.190mA0.501%
12.010968A75.0%-0.575%-0.560%-0.558%10.405mA0.575%
14.013064A87.5%-0.576%-0.574%-0.563%11.510mA0.576%
16.009736A100.0%-0.503%-0.496%-0.504%12.690mA0.504%

Between 5% and less than 10% of the nominal current, the highest observed absolute RMS-current error was 1.261% at 0.8A with an inductive power factor of 0.5. Between 10% and 100% of the nominal current, the highest observed absolute error was 0.683% at 1.6A under the same load condition. Above 2A, the absolute current error remained below 0.6% throughout the nominal metering range.

Table 4-5 Extended Current-Range Characterization
Mean Reference CurrentPF = 1PF = 0.5 LPF = 0.8CMaximum Standard DeviationMaximum Absolute Relative Error
32.047744A-0.209%-0.194%-0.211%26.771mA0.211%
42.011713A+0.316%+0.344%+0.419%29.467mA0.419%
52.093418A+0.709%+0.702%+0.724%28.478mA0.724%

The extended current range up to approximately 52A was characterized to verify the measurement path used by the protection functions. This range is outside the nominal 16A metering range. The maximum observed absolute RMS-current error was 0.724% at 52A.

During the current and power-factor sweep, the mean reference voltage was approximately 230.005V. Within the nominal current range from 0.8A to 16A, the maximum observed absolute RMS-voltage error was 0.041%. This indicates that the current magnitude and load phase had no significant effect on the voltage measurement.

Table 4-6 Voltage Measurement Error, 120V at 60Hz
Nominal VoltageMean Reference VoltageMean TIDA VoltageStandard DeviationRelative Error
108V108.0022V108.0054V0.0076V+0.0029%
120V120.0022V119.9993V0.0041V-0.0024% (1)
132V132.0025V132.0026V0.0082V+0.0001%
Table 4-7 Voltage Measurement Error, 230V at 50Hz
Nominal VoltageMean Reference VoltageMean TIDA VoltageStandard Deviation Relative Error
207V207.0070V207.0560V0.0218V+0.0237%
230V230.0047V230.0304V0.0178V+0.0112% (1)
253V253.0079V252.9926V0.0084V-0.0060%

(1) Calibration point

Voltage-measurement accuracy was evaluated at ±10% around the nominal 120V and 230V operating points. The 120V measurements were performed at 60Hz, while the 230V measurements were performed at 50Hz. Each operating point contains 31 TIDA-011030 readings recorded at intervals of one second.

Across all six operating points, the maximum absolute mean relative error was 0.0237%, measured at 207V. The maximum standard deviation was 21.8mV at the same operating point.