During the construction and installation of the power cable, or during operation, short circuits, overloaded operation, insulation aging, or external damage often cause failures. For this reason, Jiaotai Cable explains the method of finding cable fault points so that everyone can quickly find the cable. Failure point.
1. Sound measurement method: The sound measurement method is based on the sound of the fault power cable discharge. The sound measurement method is more effective for high-voltage cable cores for insulation layer flashover discharge. The sound measurement equipment used is a DC withstand voltage tester.
2. Capacitance amperometry: During operation of the cable, capacitance exists between the core and the core. The capacitance is evenly distributed. The capacitance is linearly proportional to the length of the cable. The capacitance amperometry is based on both. Based on the principle of proportional relationship to measure, it is more accurate to detect the breakage of power cable core wire.
3. Bridge method: The bridge method measures the DC resistance value of the cable core with two-arm bridge, and then accurately measures the actual cable length, and calculates the fault point according to the proportional relationship between the cable length and the resistance. In this method, the error for the direct short-circuit or short-circuit point contact resistance between cable cores is less than 1Ω, and the error is generally not more than 3m. For faults with contact resistance greater than 1Ω at the fault point, the resistance can be reduced to 1Ω by increasing the voltage through burning. Below, measure again according to this method.
4. Zero potential method: zero potential method is the potential comparison method, it is adapted to the short length of the cable core ground fault, the application of this method is simple and accurate measurement, does not require precision instruments and complex calculations.
Jiaotai Cable Commitment Statement:
1. After leaving the factory, the cable product ensures compliance with the customer's regulatory requirements.
2. If the customer finds quality problems during use, JiaoTai cable staff will respond 24 hours after receiving the information and need to dispatch the relevant personnel within 24 hours after the site is resolved.
3. For those products that are truly the product quality issue of our company, we shall refund or replace or pack the service according to the customer's requirements. After the economic loss to the customer is confirmed, the compensation shall be paid in accordance with relevant regulations.
1. Sound measurement method: The sound measurement method is based on the sound of the fault power cable discharge. The sound measurement method is more effective for high-voltage cable cores for insulation layer flashover discharge. The sound measurement equipment used is a DC withstand voltage tester.
2. Capacitance amperometry: During operation of the cable, capacitance exists between the core and the core. The capacitance is evenly distributed. The capacitance is linearly proportional to the length of the cable. The capacitance amperometry is based on both. Based on the principle of proportional relationship to measure, it is more accurate to detect the breakage of power cable core wire.
3. Bridge method: The bridge method measures the DC resistance value of the cable core with two-arm bridge, and then accurately measures the actual cable length, and calculates the fault point according to the proportional relationship between the cable length and the resistance. In this method, the error for the direct short-circuit or short-circuit point contact resistance between cable cores is less than 1Ω, and the error is generally not more than 3m. For faults with contact resistance greater than 1Ω at the fault point, the resistance can be reduced to 1Ω by increasing the voltage through burning. Below, measure again according to this method.
4. Zero potential method: zero potential method is the potential comparison method, it is adapted to the short length of the cable core ground fault, the application of this method is simple and accurate measurement, does not require precision instruments and complex calculations.
Jiaotai Cable Commitment Statement:
1. After leaving the factory, the cable product ensures compliance with the customer's regulatory requirements.
2. If the customer finds quality problems during use, JiaoTai cable staff will respond 24 hours after receiving the information and need to dispatch the relevant personnel within 24 hours after the site is resolved.
3. For those products that are truly the product quality issue of our company, we shall refund or replace or pack the service according to the customer's requirements. After the economic loss to the customer is confirmed, the compensation shall be paid in accordance with relevant regulations.
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