DC bridge `` MVU-49 ''.

Instruments for adjusting and controlling the PTA.DC bridge "MVU-49" has been produced since 1950. The bridge is designed to determine the nature and location of damage in overhead and cable lines and to measure resistances at direct current from 10 to 100,000 ohms with an error of ± 0.2%. The device makes it possible to carry out the following types of measurements and tests: Measurement of resistances at direct current. Determination of the nature of damage to overhead or cable lines: earth fault; short circuits between the wires. Determination of wire asymmetry. Determination of the location of the short circuit of one wire to ground: by the method of three measurements; by the loop method; by the three-wire method. Determination of the location of a short circuit between wires to ground. Determination of a short circuit between wires. Determination of the break point of a four-wire cable. Determination of the breakage location of the overhead line wire. In addition, it is possible: using the bridge comparison arm as a resistance store; using the internal galvanometer of the bridge separately as a zero gauge.