FIELD: electrohydraulic control systems for turbomachines. SUBSTANCE: actuating hydraulic device of protection unit is made in the form of hydraulic distributor; control spool valve is provided with additional bands on plunger and ports through which hydraulic line connected to one of control chambers of spool valve of electrohydraulic booster passes due to which abrupt relief of pressure is ensured at operation of protective unit; pressure relieving is effected simultaneously through hydraulic distributor of protective unit and sloop valve of electrohydraulic booster. Besides, control spool valve of protective unit may be provided with increased number of bands on plunger and ports connected with hydraulic distributor and check pressure hydraulic line, thus providing for dual protection: by electric and hydraulic signals. EFFECT: enhanced efficiency of protection. 3 cl, 2 dwg
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