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德國PTL漏電起痕測(cè)試儀 M31.06漏電起痕試驗(yàn)儀 供應(yīng)進(jìn)口漏電起痕測(cè)試儀適用于照明設(shè)備、
低壓電器、家用電器、機(jī)床電器、電機(jī)、電動(dòng)工具、電子儀器、
電工儀表、信息技術(shù)設(shè)備的研究、生產(chǎn)和質(zhì)檢部門,也適用于
絕緣材料、工程塑料、電氣連接件、輔件行業(yè)
PTL漏電起痕試驗(yàn)是 IEC60112 : 2003 《固體絕緣材料耐電痕化指數(shù)和相比電痕化指數(shù)的測(cè)定方法》, UL 746A 、 ASTM D 3638-92 、 DIN 53480 等標(biāo)準(zhǔn)規(guī)定的仿真試驗(yàn)項(xiàng)目。
Tracking Resistance
It must be accepted that, in normal use, components made of insulating material may become moist and dirty. If the impurities are electrically conducting, current will flow be-tween parts of different voltage potentials - the tracking current. As a result, small flash-overs may occur, which cause thermal stresses to the surface of the insulating material.
The visual result of thermal decomposition of the insulating material caused by the tracking current is called the track. The interconnecting formation of carbonized material forms a tracking path, by which a lasting current conducting connection results. Thereafter the component cannot fulfill its intended electrical function in the majority of cases and parts may catch fire. The resistance of an insulating material to track formation is called the tracking resistance.
Test Method
The behaviour of the surface of solid insulating materials under the influence of tracking currents is to be determined as follows: The tracking currents are produced by allowing drops of an electrically conductive solution to fall centrally between two electrodes which are put on the sample and subjected to an alternating voltage.
The tests can answer the following questions:
· What highest voltage causes no breakdown up to 50 drops, while another voltage, 25 volts lower than the previously used voltage, causes no breakdown up to 100 drops? (Method CTI).
· Does no breakdown occur at a given voltage up to 50 drops each? (Method PTI).
Testing Apparatus
Platinum is specified as a material for the elec-trodes. The power supply unit is designed for voltages up to 600 V, resp. up to 1 000 V. An electronic control unit serves for releasing the drops.
In the case of the PTL tracking test apparatus, the electrode arrangement is mounted in a cabi-net with polycarbonate panes. By two wing doors, a good accessibility of the testing ar-rangement ensures a pleasant working. A safety system breaks the supply when the cabinet is opened.
Standard Outfit:
1 Pair of electrode holders, swivelling and adjustable in height, pressure force with inserted electrodes each 1 N, distance between electrodes adjustable,
1 Pair of Platinum Electrodes, with dimensions in accordance with IEC 60112, 30?chisel-edged at both ends, made of platinum, purity 99.9 %,
1 drop dispensing unit, adjustable in height, easy to dismantle, container cylinder of acrylic glass, jet nipple ?
1.0 mm, adjustable valve needle with electromagnet,
1 timer for the electromagnetic valve for an impulse every 30 seconds, impulse width adjustable for setting the drop size, with resettable counter for switching off the apparatus, with digital display for the testing time in minutes and seconds,
1 isolating transformer and variable ratio transformer for setting the testing voltage, output more than 600 VA,
voltage drop less than 10 %,
1 sample desk, precisely adjustable in height by a thumb wheel, with plate of glass,
1 adjustable resistor to limit the current to 1 A,
1 current indicating instrument 1.5 A, r.m.s., class 1.5, 1 voltage indicating instrum