The formation of the long pressure protection voltage.
From vice winding step-down transformer B1 first, after 15 v voltage diode VD15 half-wave rectifier, capacitor C5 filter, resistance R19, R20 partial pressure, on the resistance of the R20 UR20 remove the dc voltage control signal.
The voltage signal UR20 is proportional to the generator
output voltage UAC, added to the startup circuit behind.
When normal generator output voltage, the voltage on the resistance of the R20 UR20, the regulator tube breakdown, W4 triode VT5 in saturated conductivity, the time delay of the circuit capacitor C6 is short circuit.
Because the triode VT5 saturated conductivity, therefore, VT5 collector potential VC5 about 0.
3 v, so the diode VD17 cut-off, the unijunction transistor BT and export of SCR silicon controlled rectifier circuit, the output voltage signal.
Under-voltage protection start and delay circuit.
Under-voltage protection started and delay circuit by the resistance of R22, R23 and capacitor C6 and C7.
When the generator output voltage drop to 65% rated voltage Ufe, as a result of the generator output voltage has been below the under-voltage protection start voltage setting value, at this point, the voltage on the resistance of the R20 UR20, drops, low to the regulator tube can not be breakdown, therefore, triode VT5 from saturated conductivity to cut-off.
At this point, the working power supply through resistance R22, R23 and diode VD17 to parallel charging capacitor C6 and C7 with charging process, the voltage of capacitor C6 and C7, charging capacitor C6 and C7 da unijunction transistor BT the time needed for the peak point of the voltage, delay time is under-voltage protection.
It consists of BT unijunction transistor and thyristor contactless SCR and other parts export circuit.
Owe when rolling, large instantaneous short circuit current, short circuit the short time delay and overload long time delay tripping protection signal, composed of diodes VD17, VD18, VD19 three-terminal or gate, as long as the protection of one of these, you are able to operate the export circuit, make the unijunction transistor trigger output trigger, trigger thyristor SCR conduction, through export output tripping circuit control signals.
S is in the trip coil, when it lost electricity switch will trip.
Generator in the normal power supply, the output voltage by the B1 step-down transformer, the third deputy winding voltage 84 v, the single-phase rectifier bridge rectifier circuit, the adjustable output voltage by the Bl step-down transformer, the third deputy winding voltage 84 v, the single-phase rectifier bridge rectifier circuit, the adjustable winding resistance R25 half part, the trip coil S power supply, the current flow from the 7 to 8, make automatic switch in the switching state.
The control process of long pressure protection.
When the generator output voltage is lower than the under-voltage protection start voltage setting value, the triode VT5 from saturated conductivity to globe, capacitor C6 and C7 is charging, capacitor voltage reach a peak point of BT tube voltage, BT tube conduction, capacitor C6 and C7 R33 discharge through the tube for resistance, resistance R33 UR33 spike pulse voltage, to trigger the thyristor SCR conduction, ZL1 rectifier circuit, the R25 upper S in the opposite direction (to the trip coil
By the side to 7 and 8)
Provide current, offset each other, trip coil S loss of pressure, automatic trip switch.
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