FIELD: high-frequency communications using power transmission lines to transfer various signals.
SUBSTANCE: device designed to transfer supervisory control, automatic emergency control, and relay protection signals over power transmission lines is built around three-circuit band filter that has line leads, resistance matching means incorporating input circuit inductively coupled with output circuit which is shorted out by capacitor and connected with aid of LC circuit to output cable lead; capacitor is connected in addition between line lead and input circuit of resistance matching means and inductance coil is inserted between line leads. Voltage limiter that functions as protective gear is connected to line leads and double-winding transformer or autotransformer is used as matching means.
EFFECT: eliminated shunt effect of protective gear, enlarged pass-band, enhanced electric strength of device.
3 cl, 3 dwg
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