Relay protection test instrument works - Database & Sql Blog Articles

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

Photocoupler

The relay protection test instrument is divided into two loops: the main loop and the auxiliary loop. The main loop is adjusted by a large knob, the auxiliary loop is adjusted by a small knob, and the main loop controls the various quantities of the output through the “output selection” button switch on the panel, and The digital voltage/current meter on the instrument automatically monitors its output value each time an output is switched. The auxiliary circuit directly controls the output through the output switch control, and the measurement can be attached to the multimeter measurement.

The input AC220V power supply enters the input end of the double carbon brush regulator T1 through the output control relay K1, and enters the isolation transformer T2 (part-time riser) through the power adjusted by the T1 large knob. The riser is divided into three tap outputs, one The tap is AC0-250V output, the rated current is 3A; the tap output voltage can be outputted by 0-350V DC voltage after rectification and filtering; the second pumping is 15V (10A), the tap is controlled by the sensor through the relay output 0-10A AC current, one way through the resistance output 0-500mA AC current, one way through the relay conversion can output 0-10A or 0-500mA DC current; the second tap is 10V (100A) high current end, the tap passes directly through the sensor side Output 100A current, the circuit has a strong load capacity, but the output is slightly overloaded and cannot be in a large current state for a long time.

Relay protection test instrument auxiliary circuit

The secondary circuit of the relay protection test instrument is the same as the main circuit. The AC220V power supply enters the voltage of the T1 small knob adjusted by the double carbon brush regulator. The output transformer 04 can directly adjust the output 0-20V or 0-250V AC voltage or 0. -350V DC voltage, this circuit is rated at 1A. Press the auxiliary circuit "output control" switch and adjust the small knob to output.

Measuring circuit

The main circuit output regulated by the large knob is AC “0-250V”, “0-500mA”, “0-10A”, “0-100A”, DC “0-350V”, “0-500mA”, “0- 10A" is converted by the relay on the circuit board inside the device. Each time a file is switched, the corresponding output can be monitored. The "0-500mA" file is included in the "0-10A" file. When used, it is “0-500mA” monitoring under “0-10A”.

Time measurement

The device has a built-in 6-digit chronograph, and the electronic stopwatch can be started internally or externally. When starting internally, press the “Output Control” switch to start the stopwatch and stop the stopwatch by shorting the stop terminal on the device panel. The stopwatch has a separate power switch that can be turned off when not in use.

Sound and light tips

The built-in sound and light cueing circuit of the circuit device can connect the contact point to the sound and light prompting jack of the test box when the contact of the measured electrical device is in contact, and the alarm sound or light is emitted in the test box, indicating the action of the disconnector contact.