CPU繼電器功能由兩個處理器控制：一個是Freescale MPC5125 32位微處理器，用于測量所有模擬信號和數(shù)字輸入并控制所有輸出繼電器，另一個是Free scale MPC8358 32位微處理器用于控制所有以太網(wǎng)通信協(xié)議。模擬輸入和波形捕獲磁性變壓器用于縮小來自源儀表變壓器的輸入模擬信號。模擬信號然后通過11.5kHz低通模擬抗混疊濾波器。然后，采樣和保持緩沖器同時捕獲所有信號，以確保不存在相移。信號由16位a/D轉(zhuǎn)換器轉(zhuǎn)換為數(shù)字值，后傳遞給CPU進(jìn)行分析。“原始”樣本在軟件中進(jìn)行縮放，然后放入波形捕獲緩沖區(qū)，從而模擬故障記錄器。可以通過EnerVista 8系列設(shè)置軟件從繼電器中檢索波形，用于顯示和診斷。頻率頻率測量是通過測量三相母線電壓、線路電壓或三相電流的復(fù)合信號的零交叉之間的時間來實現(xiàn)的。信號通過低通濾波器以防止假過零。頻率跟蹤利用測量的頻率來設(shè)置電流和電壓的采樣率，這使得離散傅立葉變換（DFT）算法對于非標(biāo)稱頻率具有更好的精度。
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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