Hi pot test procedure for cables pdf free

Jan 16, 2014 dc hipots can be used for the following testing applications. Low voltage directive itself doesnt indicate electronic product needs to pass what kind of test, the meaning of. Hipot test is the most common type of electrical safety test. This technical article provides general guidelines for high potential hi pot dc testing of mv power cables. Engineers use hipottesting instruments on cables, wires, circuit boards, appliances, electric motors, and transformers. Cable types, design, and associated insulation faults. Commissioning tests for hv underground cables up to 33kv swp page 5 of standard work practice sp0407 ver 16 ergon energy corporation limited abn 50 087 646 062 this test is required for xlpe and paper lead cables.

Between contacts and shielded, the puncture voltage must not less than 1. Insulation resistance testing is a nondestructive test procedure. Often, the hipot hi pot tests are carried out manually, for which a suitable link between the operator, hipot tester and dut is required. Cables and conductors with very capacitive nets, such as very long cables, also require higher charge and current limits when performing a hipot test. However, in many cases these tests are not performed, even the basic ac hipot test, because the power required from the test set to charge the capacitance of a large coil can be very high, making the. An insulation resistance testmeasures the quality of the electrical insulation used in a product.

An indicator panel at the top of cableeyes control screen shows the present hipot settings. I have done this test with several motors in our mills with baker insulation tester instrument about one year ago. The test is usually performed at about 75% of the typical breakdown voltage and is done as a safety net. The hipot test the dielectric voltagewithstand test is commonly known as the hipot test. I saw cables tested years ago and am wondering if the same method would be productive with motors. Testing of high voltage cables manual horizon power. Withstand test apply high voltage on power and ground. Hipot testing is an abbreviation for high potential testing a category of electrical tests used to verify the effectiveness of electrical insulation in transformers, motors, printed circuit boards, electrical sub. High voltage xlpe cable systems technical user guide. Vlf testing of shielded power cables by paul brooker, consultant to techrentals division of tr corporation. Hipot, or high potential, is a class of electronic test equipment used to verify electrical insulation. Hipot testing we provide services of dc high voltage proof testing of hv cables and switchgears up to 120 kv.

During cable pulling, cable is sometimes subjected to physical stress due to excessive force exerted on it that could eventually leads to damaging the outer layer parts that serve as primary protection of the cable. These tests include a simple ac withstand test and diagnostic testing like tan deltapower factor measurement and partial discharge analysis. It is commonly used in the industry for acceptance testing prior to energizing the cable and for maintenance testing programs. Low voltage directive nowadays and emc directive are common use in european community, various member countries should obey them. In order to pass the hi pot test, the production folks must make sure that they made it like the design engineer designed it. Misinterpretation of the relevant standard may result in the product being subjected to a hi pot design verification test to the levels described above. Hipot test makes surety of no current will flow from one point to another point.

Measuaring motor insulation using hi pot tester electrical. Due to the nature of a dc withstand test, setting high and low leakage limits can prove difficult. Standard for acceptance testing specifications for electrical. A simple water metaphor may help clarify this condundrum. However, we must understand the difference between hipot dielectric testing and standard high voltage test. During the test process, keep yourself and all nearby persons at least three feet away. What is the purpose of the hipot test, and what hazard does it address or obviate.

Dielectric withstand or hipot test the dielectric voltagewithstand test, or hipot high potential test, is designed to stress the insulation of your product far beyond what it will encounter during normal use. Hi afton chemical, before to perform this test made a megger readding and if you have a good reading perform the hipot test. The dielectric withstand hipot test in compliance magazine. The probes with builtin start switch protect the testing personnel, who.

Using the right diagnostic tester keeps equipment operational so that users are able to ascertain whether insulation is functioning properly. Dry testing transformer series is produced, it is completely changed by the backward state of old test transformer stupid, big and heavy, it can produce our matching mounted on a highvoltage silicon stack to provide dc highvoltage test power supply, with a control box,automatic protection microammeters, gap and other ancillary equipment. One safe and effective testing method offered by industrial tests, inc. Designed to verify that the insulation of a product is. Dec 14, 2011 what mental images do you have about testing cables with high voltages. Electrical safety testing reference guide importer over high. How to conduct a hipot test on a 11kv cable answer prabhu krishna. Insulationresistance test data may be used to establish a trending pattern.

I was wondering if anyone has ever heard of hipotting a cable that is still terminated to the bus. Deviations from the baseline information permit evaluation of the insulation. Designed to verify that the insulation of a product is adequate enough to withstand high voltage. The service life of a cable is defined as its operating time. When performing an inspection, a quality control firm will conduct a variety of special quality control tests, depending on the type of product. Terminal spacing problems and tolerance errors in cables. However, the standards state that production hipot testing should not exceed 1,500vac, or its dcrectified equivalent of 2,121vdc, from input to output or input to. First, each of the standards seems to have its own unique voltage which differs from all the other standards. The test setup and procedures are identical for both ac and dc hipot tests. What mental images do you have about testing cables with high voltages. Ieee std 400 provides additional information on dc testing and evaluation of the insulation of shielded power cable systems c. Jul 31, 2017 the purpose of the dielectric withstand hipot test is to determine whether the insulation from the primary circuit to grounded or accessible parts has sufficient electric strength to withstand the normal overvoltages which could occur in service. The test is sensitive to arcs or corona so it often finds terminal spacing problems, overmold problems, tolerance errors in idc cables, or any problem that might produce arcs.

Section 7 of the ansineta standard for acceptance testing specifications for electrical power equipment and systems may be reproduced and used on a cut and paste basis for the particular type of equipment to be tested. The hipot tester current trip level should be set high enough to avoid. The test voltages to be used vary depending upon whether the device or circuit is low or high voltage, a primary or control circuit and whether tested at the factory or in the field. Measuaring motor insulation using hi pot tester 28012012 by lemau 1 comment when we need to evaluate the motor condition, hi pot tester or high potential tester is the common equipment are used.

Misinterpretation of the relevant standard may result in the product being subjected to a hipot design verification test to the levels described above. It is done with a state of art continuously variable high voltage testing set hipot capable of producing 0120 kv dc output voltage. Image you are bathing in bath tube, suddenly drier in operating dropping into bath tube, the current flows from drier through your body to ground under this situation. During the hipot test, the cirris cable tester can raise voltage simultaneously on all the legs of a component or circuit so.

A dielectric withstand test or high potential or hipot test is an electrical test performed on a component or product to determine the effectiveness of its insulation. Dc hipot test at test start, there will be inrush current. Is the cable really free of serious insulation defects after passing a dc. Hipots ac, vlf dielectric loss measurements partial discharge testing. This guide provides a general overview of the regulatory framework and approval process and explores the specific manufacturing responsibilities and test procedures associated with electrical safety testing. Any leakage current exceeding a preset limit reveals the presence of moisture, flux, or other. In fact, these tests can result in damage to the cable insulation. Electrical safety testing reference guide touch area. Guidelines for high potential hipot dc testing of medium. Ac hipot testing ac high potential tests are conducted at voltages above the normal system voltage for a short time.

Once the insulation is charged full test potential, the leakage current drops off to near zero ma. Acceptable procedures for conducting hipot testing, although varying slightly in technique, have been standardized as either a withstand test or a timeleaking current test. Hi one misconception is that a hi pot test is not destructive. Hipot testing what is hipot testing dielectric strength. One test cycle can include any combination of a fast dc test, full dc test, and ac test. Timely conducted testing procedures can help notice the loss of cable insulation integrity, spot signs of its deterioration caused by aging, and therefore prevent cable failure. I ran into hi pot test requirements with aircraft instruments. To learn more, subscribe to the cirris systems channel and visit. Cableeye hvx system for high voltage cable and harness. Dc high potential testing dc hipot testing purpose dc hipot testing is used for proof testing shielded cables 5kv to 46kv in the field.

The following sections of the ansineta standard for acceptance testing specifications for. Acceptable procedures for conducting hipot testing, although. The test measures the insulation resistance between the phases andor between phase and ground. Unless the type test was marginal, the routine test, in the end, finds gross defects in the manufacturing process. The ground runs through the ct and the breaker is tripping on reset.

High voltage field acceptance test prior to being placed in service. However, the standards state that production hi pot testing should not exceed 1,500vac, or its dcrectified equivalent of 2,121vdc, from input to output or input to ground. The test is a means to qualify a devices ability to operate safely during. Dc hipots can be used for the following testing applications. When a voltage is raised quickly on a highly capacitive net, there is an inrush of current, even though the net is electrically isolated from other nets. The specially developed test probes sp 02 and sp 03 of sps electronic provide ergonomically and technically optimised connections. The test is a means to qualify a devices ability to operate safely during rated electrical conditions. Inadequate creepage and clearance distances introduced during the manufacturing process. A hipot, or high potential tester, is capable of measuring the electrical insulation in finished appliances, cables, and other wired systems. The description of these tests will not apply to watercooled stator windings since the test procedure and analysis differ for watercooled units. Connect the ground lead of the hipot tester to a suitable building ground or grounding electrode conductor. Manual vlf instruments require the operator to know the. The test set was dc and the current was limited to a very small value.

Standard for acceptance testing specifications for. High voltage xlpe cable systems techincal user guide brugg cables page 4 selection process of cable design 1. Distance 250m 500m m 2000m cable size m 11kv or less 400mm2 250 125 60 30 185 240mm2 300 150 75 37. Since the dc is free of capacitive division, it is more effective in. The operators manual for the particular test set being used should be read and well understood. As we know,a multimeter or ohm meter reading only can determine if a motor winding is open or shorted but cannot checked winding insulation condition. Typically a pot test is considered a destructive test.

Performed by stressing the insulation of the product far. Ramp down, dwell time test time, trip current, and trip delay soak time are adjustable. These features are used with a dc hipot or ir test. A properly wired and insulated electrical system will have negligible current flow during this test. Some electrical cables have electrical components such as integrated circuits, diodes, capacitors and resistors. Hvx with cb29s, 128 test points, expandable external terminals for single channel safety test. The dielectric voltage withstand test page 2 the dielectric voltage withstand test is an integral part of the product safety evaluation of electrical and electronic devices, and provides manufacturers with important information regarding the quality and appropriateness of the chosen insulation system. Hipot test is short name of high potential high voltage test and it is also known as dielectric withstand test. Hipot testing what is hipot testing dielectric strength test. Hi pot dielectric breakdown automated verification howto. Can the pcb withstand the voltage stress applied to it. Hipot test is a contraction for high potential hv testing. The test may be between mutually insulated sections of a part or energized parts and electrical ground.

The hipot test is another safety subject of which few of us feel comfortable that we are in control. Test method is operating dut and under the status of all switches, link cables. Confirm that all equipment or cable that is not to be tested is isolated from the circuit under test. As electrical safety engineers already know, electrical. The dc hipot is a practice to evaluate the insulation system integrity, i was used for many years with a few problems, for a machines with 5 or more years old we use a voltage test of 1500 v for 460 machines and v for 230 machines. The assumption is that if the insulation can withstand the significantly higher voltage for a given time it will be able to. All tests made following cable installation and during the warranty period must be performed in accordance with the applicable specifications. Leakage current detected during the high voltage test phase provides a measure of insulation quality. The purpose of the dielectric withstand hipot test is to determine whether the insulation from the primary circuit to grounded or accessible parts has sufficient electric strength to withstand the normal overvoltages which could occur in service. Additional columns may be turned on in the net list to show actual dc voltage, dc current. Guidelines for high potential hipot dc testing of medium voltage. Additional columns may be turned on in the net list to show actual dc voltage, dc current, dc isolation, ac voltage, ac current, and ac isolation. One of these tests is the hipot test, which is performed when inspecting electrical products. Advanced test equipment rentals carries a wide selection of hipot and cable testers for your electrical analysis needs.

The test can be done at various times such as acceptance of new cable installation, maintenance testing to track insulation degradation and as a pre and post test for splicing existing cables to new ones. Mv test spec plant cables equipment rated voltage kv ac testing dc testing hipot test partial discharge test. The manufacturers recommended method for cable preparation of 15 kv and 5. This discussion will also focus on testing of stator windings and not on testing individual bars or coils.

Cableeye hvx system for high voltage cable and harness testing. A hipot testmeasures the ability of a product to withstand a high voltage applied between the circuits of a product and ground. Withstand or hipot cable testing withstand or hipot testing is used to evaluate the condition of cable insulation during installation, acceptance, or maintenance testing. Meanwhile, your heart palpitation unregulated and blood pressure falling down causes tragedy cant be redeemed. A leakage current testchecks that the current that flows between ac source and ground does not exceed a safe limit.

Timer is also fitted to select the time duration of dc test. The limited approach boundary for this hipot procedure at volts is 5 ft. Oct 15, 2014 the purpose of the routine test is to determine that the production folks covered all their bases. Dec 01, 2011 the limited approach boundary for this hipot procedure at volts is 5 ft.