Function of the device with rolling owed tripping protection;
Extra large short-circuit instantaneous trip protection;
Short circuit the short time delay tripping protection and overload long time delay tripping protection function.
Working principle of relay protection circuit (1) dc voltage power supply circuit, when the generator
voltage, the output of the line voltage UAC added to the primary side of transformer B1, after dropping from the second deputy winding voltage 74 v, single-phase rectifier bridge rectifier circuit, then through R34C10 resistance capacity filter and regulator tube W5 voltage regulator, as a power supply circuit dc voltage stability work.
(2) long rolling protection circuit: 1)
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.
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