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Dołączył: 17 Maj 2018
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PostWysłany: Sro Wrz 19, 2018 04:36    Temat postu: adidas-pierre-pilote-jersey Odpowiedz z cytatem

General Description and Features

The MCCB tester is a programmable , high-current source designed specifically for testing molded-case circuit breakers as well as thermal, magnetic, or solid-state overload motor-protection relays.

MCCB Timer

The tester built-in timer can test the time-delay characteristics of protection relays and molded-case circuit breakers. Once the test is initiated, the current source and the timer are automatically turned on at the next zero-crossing point of the AC. The timer stops when the device input detects a change in the dry contact or voltage input, or detects the removal of the test current. The test results are then displayed in milliseconds and fractions of a cycle(s) on the unit’s back-lit LCD screen (20 characters by 4 lines).

MCCB-250 Current Source

The device has 4 current-source outputs (5 A @ 120 Vac , 25 A @ 24 Vac, 120 A @ 6 Vac, 250 A @ 3 Vac) that conduct the test current through the high-impedance load circuits. Each current source can tolerate short-duration over-loads up to 4 times the rated current. This feature is used for testing the instantaneous trip element of molded-case circuit breakers. When using this feature, the selected test current is displayed on the LCD screen. When it is used as a current source, the current-flow time (the current-on period) is displayed on the LCD screen.

External Current Input

This device also provides an external current input (0 – 10 A). Both internal and external current source readings can be viewed at the same time.

AC Current source

The tester provides five AC current outputs (items 1 , 2, 3, 4, and 5 in Figure 1). AC test current is set by the current control knob. This test current is measured and displayed on the LCD screen. The device’s output current ratings are shown in Table 3 and Table 4 below.

Table 3. Current Output

120 Vac @ 5 A
24 Vac @ 25 A
6 Vac @ 120 A
3 Vac @ 250 A

Table 4 . Overload Current Output

100%(1x) - 30 Minutes - 30 Minutes
200%(2x) - 3 Minutes - 5 Minutes
300%(3x) - 30 Seconds - 4 Minutes
400%(4x) - 4 Seconds - 7 Minutes

Current Output Control

The tester current source output is controlled by the up arrow and down arrow keys. Three control modes are available: ON+TMR, OFF , and MOMT. The OFF mode indicates that both the current source output and timer are off. The MOMT mode turns on the current source momentarily. To turn on the current source, press and hold the down arrow key. The LED indicator next to the “MOMT” label will turn on indicating that the device current source is on. The output current will also be displayed on the LCD screen. Its current output can now be set by turning the current control knob. Release the down arrow key to turn off the current source. The ON+TMR mode turns on the MCCB tester current source and timer. This initiates a test and is stopped by using the timer stop inputs. The test results will be displayed on the LCD screen. The test can also be terminated by pressing the down arrow key.

This content has been taken from http:www.ideamarketerslibraryarticle.cfm?articleid=3436453

NEW YORK, July 17 (Xinhua) -- The crash of a Malaysian passenger plane in Ukraine on Thursday was shrouded in mystery of a deliberate attack, with Kiev trading accusations of blame with separatists and Moscow.

U.S. media reported that the Boeing 777 jet of the Malaysia Airlines, with 295 people onboard , was shot down by a missile when flying over eastern Ukraine en route from Amsterdam to Kuala Lumpur.

A radar system saw a surface-to-air missile system turn on and track an aircraft right before Malaysian airliner MH17 was shot down, CNN reported, citing an unnamed official.

A second system saw a heat signature at the time the airliner was hit, the official added.

The United States is analyzing the trajectory of the missile to try to learn where the attack came from and has not determined who was responsible, according to the report.

The Washington Post quoted a U.S. official as saying that American intelligence agencies had confirmed that the plane was shot down by a surface-to-air missile.

The official , who was not authorized to speak on the record about an early intelligence assessment, told the newspaper that government analysts were scrambling to determine who fired the missile.

U.S. Vice President Joe Biden said on Thursday it appeared that the crash near the Ukraine-Russia border was not an accident and that the passenger jet apparently was "blown out of the sky."

"This is truly a grave situation," Biden said.

A Ukrainian official accused pro-Moscow rebels, aided by Russian military intelligence officers, of shooting down the plane with a long-range , Soviet-era SA-11 ground-to-air missile.

"Terrorists" used a ground-to-air missile to bring down the Boeing 777 passenger plane, the official said.

Meanwhile, a rebel leader said Ukrainian forces shot the airliner down.

"The plane was shot down by the Ukrainian side. We simply do not have such air defense systems. Our MANPADs have a firing range of only 3,000 to 4,000 meters , while passenger jets fly at a much higher altitude," Interfax quoted him as saying.

Russian President Vladimir Putin also laid the blame on the Ukrainian government.

"There is no doubt that the country on whose territory this terrible tragedy happened bears responsibility," Putin was quoted by Ria Novosti news agency as saying.

"This tragedy would not have happened if there was peace in the country, if military operations had not resumed in the south-east of Ukraine," he added.

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