Tracking index of insulators
D5288 - 10 Standard Test Method for Determining the Tracking Index of Electrical Insulating Materials Using Various Electrode Materials (Excluding Platinum) , copper electrodes, comparative tracking index, CTI, TI, TI-Cu, track, tracking, tracking, contamination, tracking index, tracking resistance, Comparative tracking index (CTI), Copper electrodes, CTI-CU, Tracking, contamination, Tracking High Voltage Tracking Resistance (HVTR) UL 746A. The High Voltage Tracking Resistance (HVTR) test method is used to assess the susceptibility to tracking of insulating materials that are exposed to high voltages outdoors. Insulators installed in the open are often at the mercy of humidity. 3.2.1 comparative tracking index—an index for electrical insulating materials which is arbitrarily defined as the numeri-cal value of that voltage which will cause failure by tracking when the number of drops of contaminant required to cause failure is equal to 50. 3.2.1.1 Discussion—The voltage value is obtained from a 25 – CTI Comparative Tracking Index and PTI Proof Tracking Index of base material The increased packing density of components on the printed circuit boards leads to increasingly smaller conductor track spacings. Therefore, the CTI / PTI value in the base material data sheets gets more important. This is the index for tracking resistance. CTI: The Comparative Tracking Index Test The Comparative Tracking Index (CTI) is the maximum voltage, measured in volts, at which a material withstands 50 drops of contaminated water without tracking. Tracking is defined as the formation of conductive paths due to electrical stress, humidity, and contamination. The CTI test provides an category” and “comparative tracking index” (a measure of resistance to surface tracking). For further information on compliance issues, see the articles and industry standards referenced below. Improvements To increase breakdown voltage, the first item to check is the conductor shapes. Although
Comparative tracking index (CTI) is used to assess the relative resistance of insulating materials to tracking. The CTI expressed as that voltage which causes
The Comparative Tracking Index (CTI) is used to measure the electrical breakdown (tracking) properties of an insulating material. Tracking is an electrical breakdown on the surface of an insulating material wherein an initial exposure to heat chars the material, and the char is more conductive than the original insulator, The Comparative Tracking Index. (CTI) is the maximum voltage, measured in volts, at which a material withstands 50 drops of contaminated water without tracking. Comparative tracking index (CTI) is used to assess the relative resistance of insulating materials to tracking. The CTI expressed as that voltage which causes 6 Apr 2017 Eventually, a carbon track forms over the surface of the insulator making it conductive at a particular “tracking” voltage. Finally, a short circuit is sealing in insulator material. This paper discusses observations for the determination of the tracking indices for elastic insulators according to the DIN standard
CTI / tracking ASTM D3638. This method is used to assess the relative resistance of insulating materials to tracking. CTI/tracking
17 Mar 2005 INDEX: INSULATORS: Non-Ceramic Composite. SPECIFICATIONS AND Tracking - The formation of electrically conductive carbonized paths insulators were deficient in their resistance to moisture, tracking and UV The Swedish Transmission Research Institute (STRI) Index [2.69] classifies the. The Comparative Tracking Index (CTI) is used to measure the electrical breakdown (tracking) properties of an insulating material. Tracking is an electrical breakdown on the surface of an insulating material wherein an initial exposure to heat chars the material, and the char is more conductive than the original insulator, producing more current flow, more heat, and eventually complete failure.
The Comparative Tracking Index. (CTI) is the maximum voltage, measured in volts, at which a material withstands 50 drops of contaminated water without tracking.
Comparative tracking index (CTI) is used to assess the relative resistance of insulating materials to tracking. The CTI expressed as that voltage which causes tracking after 50 drops of 0.1 percent ammonium chloride solution have fallen on the material. CTI is an index used for electrical insulating materials which is defined as the numerical value of that voltage which will cause failure by tracking during standard test. Tracking is the process that produces a partially conducting path of localized deterioration on the surface of an insulating material as a result of the action of electric discharges on or close to an insulation surface. A Proof Tracking Index test (PTI) is usually carried out at 175 V to confirm that the sample can survive 50 drops. On the other hand, a Comparative Tracking Index test is performed over a range of voltages, incrementing the test voltage by 25 V for each succeeding test. The number of drops is always set at 50. Tracking is a phenomenon in Electrical Insulation. Tracking refers to the flow of current over the surface of the insulation. Tracking causes heating which results in damage to the insulation. As current gets a path to the ground or another energized conductor, tracking can lead to a flash over. Tracking is caused by many factors. Their electrical insulation properties can deteriorate to such an extent as a result that tracking paths are formed on the insulator surface. This test determines the tracking resistance that defines the dielectric strength of the insulating material surface and the maximum allowable leakage current (tracking). ASTM D3638: Standard Test Method for Comparative Tracking Index of Electrical Insulating Materials IEC 60112: Method for the determination of the proof and the comparative tracking indices of solid insulating materials For material properties testing, call 636-949-5835 or request a quote online.
Inclined-plane tracking and erosion test according to the IEC 60587 Standard at best they provide a comparative performance index than the rough surface. rather [5] Composite Insulators for AC Overhead Lines with a Nominal Voltage
A Proof Tracking Index test (PTI) is usually carried out at 175 V to confirm that the sample can survive 50 drops. On the other hand, a Comparative Tracking Index test is performed over a range of voltages, incrementing the test voltage by 25 V for each succeeding test. The number of drops is always set at 50. Tracking is a phenomenon in Electrical Insulation. Tracking refers to the flow of current over the surface of the insulation. Tracking causes heating which results in damage to the insulation. As current gets a path to the ground or another energized conductor, tracking can lead to a flash over. Tracking is caused by many factors. Their electrical insulation properties can deteriorate to such an extent as a result that tracking paths are formed on the insulator surface. This test determines the tracking resistance that defines the dielectric strength of the insulating material surface and the maximum allowable leakage current (tracking).
Comparative Tracking Index (CTI) UL 746, IEC 60112. Comparative tracking index (CTI) is used to assess the relative resistance of insulating materials to tracking. The CTI expressed as that voltage which causes tracking after 50 drops of 0.1 percent ammonium chloride solution have fallen on the material.