The invention discloses a line insulation testing
system, comprising a
signal leading-in connecting unit, an analog switch controlling unit, a test
voltage generating unit, a testing circuit unit, a
data processing unit, a data storage and display unit and a serial data communications unit; the characteristics are as follows: the analog switch controlling unit utilizes the connecting / disconnecting of the switch to realize the
electrical connection between the tested
signal and the testing circuit, one end of the test
voltage generating unit is electrically connected with the tested
signal leading-in connecting unit, the other end is electrically connected with a standard
resistor, the standard
resistor is connected with the tested signal leading-in connecting unit in serial,
voltage at both ends of the standard
resistor is collected, then, data is processed through a central
control unit, and the test result is obtained. Meanwhile, the connecting / disconnecting of the
analog control switch, the control of charging and outputting of direct
voltage source, the data storage display and the data communication are all centralizedly controlled by the central
control unit. Compared with the prior art, the insulation testing
system provided by the invention avoids constantly changing the connection relationship between the instrument measurement terminal and two pins of the tested signal during every testing, and realizes the automatically switching of the signal. The invention adopts DSP as a controller of the
system, the self-bringing rich
logic control units are convenient to write a timing
control circuit and a
data processing program, the corresponding control targets are easy to realize, and the design work is greatly simplified.