-
How often is insulating oil dielectric breakdown voltage testing performed?
How often is insulating oil dielectric breakdown voltage testing performed?Dielectric breakdown voltage testing is an important element in the maintenance programme of any item of oil-insulated electrical equipment. However, to get the maximum benefit from this type of testing, it is strongly recommends ...
-
Why and when is insulating oil dielectric breakdown voltage test performed?
Why and when is insulating oil dielectric breakdown voltage test performed?The dielectric breakdown voltage test is a relatively quick and easy way of determining the amount of contamination in insulating oil. Usually the contaminant is water, but it can also be conductive particles, dirt, debris, insulating ...
-
Which types of insulating oil can be tested?
Which types of insulating oil can be tested?While the generic term "oil" is almost universally used to describe insulating fluids, there are currently five different types of insulating fluid in common use. These are:(1) Mineral oil(2) High molecular weight hydrocarbon (HMWH) fluids(3) Silicone fluids(4) ...
-
Who needs to perform insulating oil dielectric breakdown voltage tests?
Who needs to perform insulating oil dielectric breakdown voltage tests?There are many types of organisation that benefit from carrying out tests on transformer oil. These include:(1) Utility contractors (principally in substations)(2) Utility companies (principally in power stations)(3) Rail companies ...
-
What is insulating oil dielectric breakdown voltage testing?
What is insulating oil dielectric breakdown voltage testing?Put simply, a dielectric breakdown voltage test is a measure of the electrical stress that an insulating oil can withstand without breakdown. The test is performed using a test vessel that has two electrodes mounted in it, with a gap between ...
-
What are the methods testing insulating oil?
What are the methods testing insulating oil?For in-service equipment in particular, there are many test techniques for evaluating the condition of the insulating oil. If the technique of dissolved gas analysis is excluded, oil tests can be divided into two basic groups.The first group includes tests ...
-
Table of NLGI consistency number and penetration range
Table of NLGI consistency number and penetration rangePenetrometer is an instrument that measures the consistency or hardness of semiliquid to semisolid materials by measuring the depth to which a specified cone or needle under a given force falls into the material. Following is table of NLGI consistency ...
-
ASTM D937 standard test method for cone penetration of petroleum
ASTM D937 standard test method for cone penetration of petroleum9. Report9.1 Report the average of all results to the nearest 0.1 mm as the penetration, ASTM D937.10. Precision and Bias10.1 Precision - The precision of the test method as determined by statistical examination of interlaboratory results ...
-
ASTM D937 standard test method for cone penetration of petroleum
ASTM D937 standard test method for cone penetration of petroleum8. Procedure8.1 The surface of the sample must not be cut level nor worked in any other way, as this may affect the result. If the temperature of the penetrometer cone (that is, the room temperature) varies from 25°C by 2°C (77°F by 3°F) ...
-
ASTM D937 standard test method for cone penetration of petroleum
ASTM D937 standard test method for cone penetration of petroleum6. Apparatus6.1 Penetrometer and Cone, as specified in Test Methods D217.6.2 Oven, capable of maintaining a temperature of 82 more or less 2°C (180 more or less 5°F) for melting the petrolatum samples.6.3 Water Bath, constant-temperature, ...
