By hvhipot 
The partial discharge detection device refers to the non-penetrating discharge that occurs between the electrodes under the action of high electric field strength in the insulating medium in the high-voltage electrical appliance.
The detection “accuracy” and the “stability” of the partial discharge detection device are related to the safety of the operation of high-voltage electrical appliances, which may affect the normal operation of the entire power system. Before the partial discharge detection device is used for testing, the type and performance of the entire device are often checked in the laboratory.
When the partial discharge is generated under the test voltage, the pulse current is generated by the coupling capacitor Ck, and the pulse signal is picked up by the input unit. After low noise preamplification, filter amplifier select the required frequency band and main amplifier amplification, it is displayed on the ellipse of the oscilloscope screen. The discharge pulse is displayed on the scan baseline, and it is also sent to the pulse peak meter to display its peak value. The time window unit controls the working time of the pulse peak meter in each cycle of the test voltage, and highlights the display of the display during this period, and the width and position can be changed, which further strengthens the anti-interference ability.
The calibration equipment of the partial discharge detection device includes: a pulse generator for transmitting calibration signals; a coupling device. The pulse generator is connected to the local sensor in the measured partial discharge detection device through the coupling device, and the local sensor is used to collect the pulse generation The calibration signal emitted by the detector; and the local detector host, which is connected with the local sensor to detect the impulse response signal. Among them, the comparison result of the impulse signal and the calibration signal is used to indicate the test performance of the partial discharge detection device. The purpose of the verification of the partial discharge detection device is to solve the technical problem of the low accuracy of the on-site verification of the partial discharge detection device by the related technology, thereby realizing the improvement of the accuracy of the partial discharge detection device for the partial discharge detection Technical effect.