The **WRPP-CAJ-R2** is a specific model of a **flexible Rogowski coil** current sensor, typically used for AC current measurement in industrial environments. These sensors are known for their ability to measure high currents without the saturation issues found in traditional iron-core current transformers (CTs). --- ### 1. Key Electronic Specifications The performance of the WRPP-CAJ-R2 is defined by its electrical characteristics, which allow it to integrate with power meters and monitoring systems. | Specification | Description | | :--- | :--- | | **Sensor Type** | Rogowski Coil (Flexible) | | **Output Signal** | Low-voltage AC (typically mV/kA) | | **Current Range** | Often scalable from 100A to 100kA | | **Frequency Range** | 10 Hz to 1 MHz (application dependent) | | **Accuracy Class** | Generally Class 0.5 or 1.0 | | **Insulation Voltage** | Often rated for 1kV to 10kV | --- ### 2. Core Electronic Components The device consists of several critical electronic sub-sections that enable accurate current sensing: #### A. The Non-Magnetic Core Unlike traditional CTs, the R2 model uses an air-core (non-magnetic) winding. - **Benefit:** It eliminates magnetic saturation, allowing it to measure massive fault currents or high-frequency transients linearly. - **Construction:** A copper winding is wrapped around a flexible plastic or rubberized form. #### B. The Shielding Layer The "R2" designation often implies enhanced protection. - **EMI Shielding:** The coil is wrapped in a grounded conductive layer to prevent electrical noise from nearby high-voltage lines from interfering with the small millivolt signal. #### C. Connector and Wiring - **Signal Lead:** Usually a shielded twisted-pair cable. - **Integrator Requirement:** Because a Rogowski coil outputs a signal proportional to the *derivative* of the current ($V_{out} = M \cdot di/dt$), the electronic signal must pass through an **Integrator circuit** (either built-in or external) to convert it back into a standard voltage or 4-20mA signal. --- ### 3. Comparison: Rogowski vs. Standard CT | Feature | WRPP-CAJ-R2 (Rogowski) | Traditional Iron-Core CT | | :--- | :--- | :--- | | **Saturation** | None | Possible at high currents | | **Weight** | Very Light | Heavy | | **Installation** | Wrap-around (Clip-on) | Must break circuit or use bulky split-core | | **Linearity** | High across all ranges | Limited to specific range | --- ### 4. Typical Application Circuit When integrating this part into a system, the electronic flow follows this path: ```mermaid graph LR A[Primary Conductor] --> B[WRPP-CAJ-R2 Coil] B --> C[Integrator/Amplifier] C --> D[ADC / Power Meter] ```