Detection device of relay protection testing device

The utility model discloses a detection device of a relay protection testing device. The detection device not only can achieve high-precision measurement (grade 0.05) to AC/DC voltage and current parameters of the relay protection testing device and high-precision measurement (0.05 degrees) to AC voltage and current phase position, but also can achieve measurement to the actuation time of the relay protection testing device, in addition, the detection device can achieve detections to the total harmonic distortion, the response speed and the synchronicity of the output amplitude of the AC voltage source and the AC current source of the relay protection testing device. The detection device comprises a signal sampling circuit, an A/D converting circuit, a DSP, a color liquid crystal display and a keyboard. The signal sampling circuit is connected with the A/D converting circuit, the A/D converting circuit is connected with the DSP for being responsible for signal sampling, processing and calculating as well as the displaying of 8.4 inch TFT color LCD and the processing of the keyboard; the photoelectric isolation circuit is connected with the DSP for being responsible for conveying signals by taking light as medium under a condition of electrical isolation and for isolating the input and output circuits.