Bimetallic thermometer fault point search method

Because of the nature of the bimetallic thermometer faults can only choose different characteristics of different fault exploration method, therefore, before exploration fault point, the nature of the first admit fault and the status of the laying of bimetallic thermometer, location and length of the necessary skills resources, this helps to quickly accurately find out the fault point location. 1) Conclude that fault properties: the most commonly used method is to use megohmmeter ( Used in underground essence safe megger) 。 At the other end of the conductor under the condition of open circuit, thoroughly measurement between the conductor and the insulation resistance of various core over the ground, or as a bimetallic thermometer core over the ground and short circuit, the clock is refers to zero. And another break in the bimetallic thermometer core sub cases, if there are any disconnection, megger pointer to infinite. 2) Fault detection method, usually with bridge method, pulse method, and the sound wave method, induction method, measuring method and so on, to the coal mine bimetallic thermometer, KDLZ - Type 1 mine bimetallic thermometer trouble tester is more appropriate, it can be applied to the gas dust explosion dangerous mines. To exploration and mining electric short circuit, grounding of bimetallic thermometer and the break line fault point location, but for shielding rubber set soft bimetallic thermometer, belt type featuring the weaving structure supervision conductor shielding rubber set soft bimetallic thermometer and armoured bimetallic thermometer with some difficult exploration, of high resistance grounding fault point can't exploration, together under humid environment, the influence of underground stray current, the exploration of fault point accuracy is bound to be affected. 3) KDLZ - Type 1 mine bimetallic thermometer faults tester, audio receiver by audio generator, electric rationality of sensor, capacitive sensor. Electric rational probe used for short and interphase short circuit measurement, capacitive sensor used for bimetallic thermometer break line measurement. Exploration and fault point location error is less than + 20 cm, exploration problems bimetallic thermometer length of 300 m. When measuring probe into a sheath maerial, two phase short circuit or relatively two end received the transmitter output on the two end of the transmitter output after trouble bimetallic thermometer into a closed loop, after wire around the frequency of 825 hz alternating magnetic field. Electric rational probe is winding on the electricity magnet coil, magnetic induction electromotive force in the coil, a receiver, when the probe moving along the bimetallic thermometer line, have sound on headphones, indicating meter. In trouble points the loudest noise, electric meter pointer swing ups and downs, the biggest problem after fell sharply to the silent, small electric meter pointer swing and even not swing. Measurement of bolt is the use of power line through capacitance probe converged on the induction to the earth, for the receiver noise in the largest beheaded, after sharp drops to zero.