产品介绍
Lightning arresters are designed to protect a power distribution system by shunting to ground the high voltage surges typically caused by lightning. Arresters subjected to the stresses of very high voltages and currents can be damaged by lightning and can deteriorate over time. Eventually, lightning arresters can fail, and when they do it is usually a violent failure resulting in the eventful destruction of the arrester.
Arresters are often installed on an overhead or underground power distribution system while the system islive. Connecting a weak or damaged arrester to a live line can result in an eventual or immediate catastrophic failure. If the failure is eventual, another outage is caused, peripheral equipment is damaged and a service crew must repair the damage and restore power. If the failure is immediate, the line personnel are endangered by the resulting system fault.
The AT-100 tests lightning arresters with high voltage DC. The high voltage DC is equal to the peak AC voltage; for example, on a 15kV system with a line-to-ground voltage of 7200V, the AT-100 DC test voltage is about 10kV. The tester measures and displays the arrester DC leakage current. It is rated for use on systems from 4kV (2.4kV line-to-ground) up to 25kV (15.2kV line-to-ground). The instrument can be used on systems up to 69kV (40kV line-to-ground) with the addition of the optional R-69 add-on resistor stick pair. The AT-100 can be used on 50Hz and 60Hz systems.
Like a voltmeter, the Lightning Arrester & Leakage Tester has high voltage resistors to limit the current through the tester, and unlike a voltmeter it has a high voltage rectifier to convert AC to DC. An arrester tested with the AT-100 cannot be damaged by the test procedure. In practice, the instrument is connected in series with the lightning arrester between an energized phase and ground.
For underground elbow type arresters, the arrester is connected to a 2-way feed-thru with its ground cable grounded. The Lightning Arrester & Leakage Tester is used with two ASP-15/25 load break bushing adapters for 15kV and 25kV systems or two ASP-35U's and R-69 add-on resistor sticks for 35kV systems. The instrument is connected from a live bushing to the feed-thru with the elbow arrester. As with an overhead arrester, leakage current is measured and displayed.
The Lightning Arrester & Leakage Tester improves overall system reliability by testing and removing from the system those arresters that are most likely to fail within a short time.When overhead arresters fail, they generally blow themselves clear of the system and leave the system phase or phases unprotected from lightning.When underground arresters fail, they generally cause a system outage and damage adjacent equipment.
The AT-100 is designed to provide a quick test on arresters using available high voltage. It is not as sensitive as a laboratory test and will not find the most subtle types of arrester damage. It will warn the user of a damaged arrester that could fail immediately upon energizing.
The AT-100 Lightning Arrester & Leakage Tester can be used as a general purpose DC high potential tester for testing the leakage current of devices other than arresters such as insulators, open switch contacts, cross arms, etc. Testing with DC minimizes the much higher AC capacitive current and allows the user to test for actual DC leakage current. The same green/red scale that applies to arresters is applicable to most other equipment.
HD Electric AT-100 避雷器和漏电测试仪
避雷器旨在通过将通常由闪电引起的高压浪涌分流接地来保护配电系统。承受极高电压和电流应力的避雷器可能会被雷击损坏，并且会随着时间的推移而老化。最终，避雷器可能会发生故障，当它们发生故障时，通常是剧烈的故障，导致避雷器的意外损坏。
当系统运行时，避雷器通常安装在架空或地下配电系统上。将弱或损坏的避雷器连接到带电线路可能导致最终或立即发生灾难性故障。如果最终发生故障，则会导致另一次停电，外围设备损坏，维修人员必须修复损坏并恢复供电。如果故障是立即发生的，那么由此产生的系统故障会危及生产线人员。
AT-100 用高压直流测试避雷器。高压直流等于峰值交流电压；例如，在线对地电压为7200V的15kV系统上，AT-100直流测试电压约为10kV。测试仪测量并显示避雷器直流漏电流。它额定用于从 4kV（2.4kV 线对地）到 25kV（15.2kV 线对地）的系统。通过添加可选的 R-69 附加电阻棒对，该仪器可用于高达 69kV（40kV 线对地）的系统。 AT-100 可用于 50Hz 和 60Hz 系统。
与电压表一样，避雷器和漏电测试仪具有高压电阻器来限制通过测试仪的电流，并且与电压表不同的是，它具有将交流电转换为直流电的高压整流器。用 AT-100 测试的避雷器不会被测试程序损坏。实际上，仪器与避雷器串联连接在通电相和地之间。
对于地下肘型避雷器，避雷器连接到 2 路馈通，其接地电缆接地。避雷器和漏电测试仪与用于 15kV 和 25kV 系统的两个 ASP-15/25 负载断路套管适配器或用于 35kV 系统的两个 ASP-35U 和 R-69 附加电阻棒一起使用。仪器通过肘形避雷器从带电套管连接到馈通。与架空避雷器一样，测量和显示漏电流。
避雷器和漏电测试仪通过测试和从系统中移除那些最有可能在短时间内失效的避雷器来提高整体系统的可靠性。不受雷击保护。当地下避雷器发生故障时，它们通常会导致系统中断并损坏相邻设备。
AT-100 旨在使用可用的高压对避雷器进行快速测试。它不像实验室测试那样敏感，并且不会发现最细微的避雷器损坏类型。它将警告用户可能在通电后立即失效的损坏的避雷器。
AT-100 避雷器和漏电测试仪可用作通用直流高电位测试仪，用于测试除避雷器以外的设备（如绝缘体、开路开关触点、横臂等）的漏电流。交流电容电流，并允许用户测试实际的直流漏电流。适用于避雷器的相同绿色/红色刻度也适用于大多数其他设备。
