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CPU继电器功能由两个处理器控制：一个是Freescale MPC5125 32位微处理器，用于测量所有模拟信号和数字输入并控制所有输出继电器，另一个是Free scale MPC8358 32位微处理器用于控制所有以太网通信协议。模拟输入和波形捕获磁性变压器用于缩小来自源仪表变压器的输入模拟信号。模拟信号然后通过11.5kHz低通模拟抗混叠滤波器。然后，采样和保持缓冲器同时捕获所有信号，以确保不存在相移。信号由16位a/D转换器转换为数字值，后传递给CPU进行分析。“原始”样本在软件中进行缩放，然后放入波形捕获缓冲区，从而模拟故障记录器。可以通过EnerVista 8系列设置软件从继电器中检索波形，用于显示和诊断。频率频率测量是通过测量三相母线电压、线路电压或三相电流的复合信号的零交叉之间的时间来实现的。信号通过低通滤波器以防止假过零。频率跟踪利用测量的频率来设置电流和电压的采样率，这使得离散傅立叶变换（DFT）算法对于非标称频率具有更好的精度。
CPU Relay functions are controlled by two processors: a Freescale MPC5125 32-bit microprocessor that measures all analog signals and digital inputs and controls all output relays, and a Freescale MPC8358 32-bit microprocessor that controls all the advanced Ethernet communication protocols. Analog Input and Waveform Capture Magnetic transformers are used to scale-down the incoming analog signals from the source instrument transformers. The analog signals are then passed through a 11.5 kHz low pass analog anti-aliasing filter. All signals are then simultaneously captured by sample and hold buffers to ensure there are no phase shifts. The signals are converted to digital values by a 16-bit A/D converter before finally being passed on to the CPU for analysis. The 'raw' samples are scaled in software, then placed into the waveform capture buffer, thus emulating a fault recorder. The waveforms can be retrieved from the relay via the EnerVista 8 Series Setup software for display and diagnostics. Frequency Frequency measurement is accomplished by measuring the time between zero crossings of the composite signal of three-phase bus voltages, line voltage or three-phase currents. The signals are passed through a low pass filter to prevent false zero crossings. Frequency tracking utilizes the measured frequency to set the sampling rate for current and voltage which results in better accuracy for the Discrete Fourier Transform (DFT) algorithm for offnominal frequencies.
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