What is Doble testing?
What is Doble testing?
The Doble M4000 is for field and factory acceptance, preventive-maintenance, and emergency diagnostic testing of all types of electrical power apparatus insulation to detect changes, and possible failure hazards, prevents loss of service by permitting orderly repair or reconditioning of defective insulation.
What is UST and GST modes of testing?
GST stands for grounded specimen test while UST stands for ungrounded specimen test.
What is UST mode?
UST mode is used to measure insulation between two ungrounded terminals of the apparatus, isolate an individual section of insulation and test it without measuring other connected insulation.
What is PF test in transformer?
POWER FACTOR TESTING Insulation power factor tests are used to measure dielectric losses, which relate the wetness, dryness or deterioration of transformer insulation. Both factory and field testing are performed to verify the insulation integrity of substation transformers.
Who owns Doble Engineering?
ESCO Technologies
Doble Engineering Company/Parent organizations
ABOUT DOBLE ENGINEERING COMPANY Doble is part of the Utility Solutions Group of ESCO Technologies Inc. (NYSE: ESE) and serves customers around the globe.
What is a insulation resistance test?
An insulation resistance (IR) test measures the total resistance between any two points separated by electrical insulation. Such tests are useful for checking the quality of insulation, not only when a product is first manufactured but also over time as the product is used.
What is tan delta?
Tan delta is the ratio between the resistive current and capacitive current. If we consider the resistance of an ideal cable to be infinite, then the total current will be purely capacitive and 90° phase shifted to the applied voltage.
What is tan delta test of CT?
Tan Delta, also called Loss Angle or Dielectric Dissipation Factor (DDF) or Power Factor (PF) testing, is an electrical dielectric test on the insulating oil used to determine its quality. The test is performed at two temperatures.
What is oil tan delta test?
The Oil Tan Delta (OTD) is a laboratory instrument, which measures the Tan Delta, Resistivity and Relative Permittivity of insulating liquids. These tests give a wider picture of the overall quality of the insulating oil, and will indicate if there is any contamination.
Is standard for tan delta test?
The frequency range for tan delta test is generally from 0.1 to 0.01 Hz depending upon size and nature of insulation. There is another reason for which it is essential to keep the input frequency of the test as low as possible. As we know, That means, dissipation factor tanδ ∝ 1/f.
What is a tip up test?
The tip-up test is a measure of void content within the ground wall insulation – it is essentially an indirect partial test. The standard describes the bridge and power factor methods for measuring DF that have been used for many decades.
What is a R1 R2 test?
For each outlet on a circuit, the resistance of both the live and earth conductors together (R1+R2) is measured back to the source. This test also helps identify polarity problems – for example, if a live wire has accidentally been switched with a neutral wire somewhere in a circuit.
What is the use of Doble test equipment?
Doble test equipment is also used to conduct excitation current tests, which can detect short-circuited turns, poor electrical connections, core de-laminations, core lamination shorts, tap changer problems, and other possible core and winding problems. The results, as with all others, should be compared with factory and prior field tests. 3.
What is the purpose of a dotdoble test?
Doble test equipment is also used to conduct excitation current tests, which can detect short-circuited turns, poor electrical connections, core de-laminations, core lamination shorts, tap changer problems, and other possible core and winding problems. The results, as with all others, should be compared with factory and prior field tests.
What is excitation current in Doble test?
Excitation Current Doble test equipment is also used to conduct excitation current tests, which can detect short-circuited turns, poor electrical connections, core de-laminations, core lamination shorts, tap changer problems, and other possible core and winding problems.
Why choose a Doble lab analyst?
Doble lab analysts are considered to be the preeminent experts in DGA, oil quality and corrosive sulfur analysis. Access unlimited expert consultation with a dedicated Doble Principal Engineer. Your engineer can consult with you on testing procedures, test data analysis, apparatus maintenance and more.
