Power cable fault tester failure causes
2023-04-15 10:32:20
Power cable fault tester failure causes:
There are many reasons for the failure of the cable. The following are some of the most common causes summarized below:
1. Mechanical damage: Many failures are caused by mechanical damage caused by careless installation of the cable or mechanical damage caused by cable construction after installation. If the damage is minor, damage to the insulation develops after several months or even years. Causes a complete breakdown of the damaged area and causes a malfunction.
2. Electrical corrosion of cable sheath: If the power cable is buried under the ground of a strong electric field (such as near the rails of large-scale traffic and electric locomotives), lead sheath corrosion of the cable sheath often occurs, causing moisture intrusion and insulation damage.
3. Chemical corrosion: The cable is buried in the area where there is acid and alkali work or near the gas station with benzene vapor. The cable fault tester often causes large areas of cable sheathing and lead packages to be corroded over long distances.
4. Ground subsidence: This phenomenon often occurs when cables cross roads, railways, and tall buildings. As the ground subsides, the cables are vertically deformed by force, resulting in cable smashing, lead package rupture or even broken resulting in various types. failure.
5. Loss of cable insulation: When the cable is laid, the groove is uneven or the outdoor head is on the pole. Due to the cable's undulation, high and low gaps, the cable insulation oil at a high level flows to a low point and makes the cable insulation in high places. Falling causes a malfunction.
6. Long-term overload operation: Due to overload operation, the temperature of the cable will increase. Especially in the hot summer season, the temperature rise of the cable often leads to the cable weak point and the first breakdown of the joint. In summer, the reason for the high rate of cable failures is this.
7. Vibratory cracking: The cable running under the railway track is broken due to the violent vibration caused by the cable's outer skin and causes failure.
8. Poor processes, poor fittings, and failure to lay cables in accordance with technical requirements are often an important cause of cable faults.
9. Do joints under humid weather conditions to mix water vapor in the joint package. Over time, flashover failures often occur.
Cable fault tester technical parameters:
1. The functional cable fault tester can output pulsed sine wave signals. When used in conjunction with a receiver, it can detect the direction of the buried cable and the buried depth.
2, technical indicators Signal frequency: 15KHz
2. Output power: ≥30W
3. Output method: intermittent 4. Working voltage: AC220V±10%50Hz
5. Ambient temperature: -50C～400C
Cable fault fixed point instrument performance index 1, test sensitivity than the signal to noise ratio than 20:1 input signal is not greater than 10μv.
2. Type of work I - signal after 300 cycles of filter amplification to listen to set II - signal to directly amplify the listening path instrument - to detect the direction of cable laying and when buried depth 3, the input impedance ≥ 1.2kΩ
4, using high impedance headphones 5, working voltage: 9V ± 10%
6, the working current: fixed-point work 5mA, path work 7mA
7, the use of ambient temperature: -200C ~ 400C
There are many reasons for the failure of the cable. The following are some of the most common causes summarized below:
1. Mechanical damage: Many failures are caused by mechanical damage caused by careless installation of the cable or mechanical damage caused by cable construction after installation. If the damage is minor, damage to the insulation develops after several months or even years. Causes a complete breakdown of the damaged area and causes a malfunction.
2. Electrical corrosion of cable sheath: If the power cable is buried under the ground of a strong electric field (such as near the rails of large-scale traffic and electric locomotives), lead sheath corrosion of the cable sheath often occurs, causing moisture intrusion and insulation damage.
3. Chemical corrosion: The cable is buried in the area where there is acid and alkali work or near the gas station with benzene vapor. The cable fault tester often causes large areas of cable sheathing and lead packages to be corroded over long distances.
4. Ground subsidence: This phenomenon often occurs when cables cross roads, railways, and tall buildings. As the ground subsides, the cables are vertically deformed by force, resulting in cable smashing, lead package rupture or even broken resulting in various types. failure.
5. Loss of cable insulation: When the cable is laid, the groove is uneven or the outdoor head is on the pole. Due to the cable's undulation, high and low gaps, the cable insulation oil at a high level flows to a low point and makes the cable insulation in high places. Falling causes a malfunction.
6. Long-term overload operation: Due to overload operation, the temperature of the cable will increase. Especially in the hot summer season, the temperature rise of the cable often leads to the cable weak point and the first breakdown of the joint. In summer, the reason for the high rate of cable failures is this.
7. Vibratory cracking: The cable running under the railway track is broken due to the violent vibration caused by the cable's outer skin and causes failure.
8. Poor processes, poor fittings, and failure to lay cables in accordance with technical requirements are often an important cause of cable faults.
9. Do joints under humid weather conditions to mix water vapor in the joint package. Over time, flashover failures often occur.
Cable fault tester technical parameters:
1. The functional cable fault tester can output pulsed sine wave signals. When used in conjunction with a receiver, it can detect the direction of the buried cable and the buried depth.
2, technical indicators Signal frequency: 15KHz
2. Output power: ≥30W
3. Output method: intermittent 4. Working voltage: AC220V±10%50Hz
5. Ambient temperature: -50C～400C
Cable fault fixed point instrument performance index 1, test sensitivity than the signal to noise ratio than 20:1 input signal is not greater than 10μv.
2. Type of work I - signal after 300 cycles of filter amplification to listen to set II - signal to directly amplify the listening path instrument - to detect the direction of cable laying and when buried depth 3, the input impedance ≥ 1.2kΩ
4, using high impedance headphones 5, working voltage: 9V ± 10%
6, the working current: fixed-point work 5mA, path work 7mA
7, the use of ambient temperature: -200C ~ 400C
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