华为UPS并机故障解决方案

华为UPS并机故障解决方案

近年来，中国电信大力开发和推广信息化应用，以全新的多业务、多网络、多终端融合及价值链为延伸，改造建设地方工程项目，使信息化成果更好地惠及社会各行业和广大人民群众。多年来，作为中国电信可靠的合作伙伴，科华恒盛积极帮助客户转型升级和信息化推广建设，携自主研发的高端电源和数据中心产品方案，在中国电信各地工程项目建设中广泛应用，为客户的基站、机房、云计算IDC建设等，提供可靠、安全、智慧的绿色电能，以及建设、运营、租赁等云基础服务保障。作为通信领域领先的设备电力保护提供商，科华恒盛28年来始终致力于电力电子技术的自主创新和发展应用，积极参与通信领域的信息化安全建设和国产化的设备替代，助力通信企业为国民经济发展和社会信息化建设作出更大贡献。

    故障现象
    动力维护人员在巡检时发现某UPS1+1并机系统异常切换至旁路供电，同时，UPS1-2出现告警,显示逆变器故障。出现该故障后，维护人员紧急联系某公司的工程师，根据厂家工程师的建议先把UPS1-1逆变恢复，将负载从旁路切换回UPS1-1逆变带载，之后再将UPS1-2下电重新上电是否能够正常工作。操作后，UPS1-1逆变器能正常开启，负载已经从旁路切换至UPS1-1逆变带载，UPS1-2下电后重启仍然显示“逆变器故障告警”。
     市场中的工频UPS电源逆变设备绝大多数采用的IGBT技术，内置隔离变压器，开关频率在1K~3KHZ，而市电的频率在50HZ，开关频率是市电频率的20~60倍，这么低的开关频率会产生大量的低次谐波，工频机由于开关频率低，无法滤除低次谐波，而3*n次谐波无法进入三角形输入变压器，这样隔离变压器对工频机的电压起着很大的作用，良好的提升电压，保障使用要求。
     隔离变压器在早期UPS电源的配置中起着不可或缺的作用，随着技术的发展UPS中逆变隔离变压器个数越来越少，现在的工频机内只有一个隔离变压器，由于机身本身的结构特点，无法剔除，而华为UPS电源凭借先进的技术，已经剔除了隔离变压器，高频无隔离变压器华为UPS电源，减少了体积 重量 提高了工作效率，势必会带来新一轮的技术革新，进而净化UPS不间断电源市场，淘汰工频UPS电源。
    处理步骤
    1、UPS1-2的逆变指示灯亮红色，故障告警显示“逆变器故障”，UPS内部断路器保持原位，UPS1-1逆变正常供电。用调机软件察看UPS1-2的机器状态和故障信息，导出设备REPORT,确认没有其它异常告警，开始下电进行维修。现场换完三个输出交流电容后，工程师测量拆下来的旧电容，发现其中一个交流电容的容量由标称的600UF直接下降为0,电容完全失效。
    2、更换完成输出电容，某工程师将UPS1-2输出开关断开，用手动模式进行单机测试，逐步调整UPS1-2逆变输出电压，同时测量逆变输出电压和交流电容的滤波电流，测试各项指标均正常，退出手动模式后，UPS1-2单机运行也都正常。
    3、完成维修后的各项功能测试，我们将UPS1-2各断路器恢复并机状态，开启UPS1-2逆变器，可是UPS1-2逆变灯一直在闪烁，无法进行并机，测试多次，偶尔并机成功，但是关闭逆变按钮后又无法再次并机，看来UPS1-2还有其它故障没有完全修复。
    4、经过分析该型号UPS工作原理和相关电路，初步怀疑“切换电路控制板AROI”异常，因此利用仓库拆下该板件进行维修更换，换上该板件后需要重新刷写参数以及板件校验，完成相关操作及测试后，UPS并机运行正常，UPS故障完成修复。
故障总结
    1、建议针对现网运行5年以上的UPS设备进行易损件的预防性更换，防止类似故障再次出现，易损件包括：交流滤波电容、直流母线滤波电容、风扇、辅助电源板等，以提高设备运行的可靠性和延长UPS使用寿命。
    2、针对超期使用的UPS应及时进行替换，该套某UPS已达到使用寿命的时间。因此，计划今年进行割接替换，目前已完成新建UPS的验收以及割接电缆的到货。
    3、建议对UPS产品进行原厂维保，以保证UPS设备维护的深度，同时可以提前预防和排除类似的设备隐患，提高故障响应度，加快故障现场处理时限。

华为UPS并机故障解决方案

HUAWEI UPS parallel machine failure solution

In recent years, China Telecom has vigorously developed and popularized the application of information technology, transforming and constructing local engineering projects with the brand-new multi-service, multi-network, multi-terminal integration and value chain as the extension, so as to better benefit all sectors of society and the broad masses of the people. Over the years, as a reliable partner of China Telecom, Kehua Hengsheng has actively helped customers upgrade and promote information technology. With its own research and development of high-end power supply and data center products, Kehua Hengsheng has been widely used in China Telecom project construction all over the country. Provide reliable, safe, intelligent green power, as well as construction, operation, leasing and other cloud infrastructure services. As a leading equipment and power protection provider in the field of communications, Kehua Hengsheng has been committed to independent innovation and development and application of power electronics technology for 28 years. Kehua Hengsheng has actively participated in information security construction in the field of communications and equipment substitution of localization, and helped communication enterprises to make greater contributions to national economic development and social information construction. Offer.

Failure phenomenon

Power maintenance personnel in the patrol inspection found a UPS1 + 1 parallel system abnormal switch to bypass power supply, at the same time, UPS1-2 alarm, display inverter fault. After the failure, the maintenance personnel contacted the engineer of a company urgently. According to the suggestion of the manufacturer engineer, the UPS1-1 inverter was restored, the load was switched back from bypass to UPS1-1 inverter with load, and then the UPS1-2 power-down was restored to work properly. After operation, the UPS1-1 inverter can be turned on normally. The load has been switched from bypass to UPS1-1 inverter with load. After the power of UPS1-2 is down, the restart still shows "inverter fault alarm".

Most of the power frequency UPS power supply inverter equipment in the market adopts IGBT technology, built-in isolation transformer, switching frequency in 1K~3KHZ, and the frequency of the market power in 50HZ, switching frequency is 20~60 times of the market power frequency, such a low switching frequency will produce a large number of low-order harmonics, power frequency machine because of low switching frequency, can not filter out the low-order harmonics. Harmonics, and 3 * n harmonics can not enter the triangular input transformer, so the isolation transformer on the power frequency machine voltage plays a great role, good voltage, to ensure the use of requirements.

Isolation transformer plays an indispensable role in the configuration of early UPS power supply. With the development of technology, the number of inverter isolation transformers in UPS is becoming less and less. Now there is only one isolation transformer in power frequency machine. Because of the structure characteristics of the fuselage itself, it can not be eliminated. Huawei UPS power supply has been rejected by virtue of advanced technology. In addition to isolation transformer, high-frequency non-isolation transformer Huawei UPS power supply, reduce the volume and weight to improve efficiency, is bound to bring a new round of technological innovation, thus purifying the UPS uninterruptible power market, the elimination of power frequency UPS power supply.

Processing steps

1. The inverters of UPS 1-2 are red, and the fault alarm shows "inverter fault". The internal circuit breaker of UPS is in situ, and the inverters of UPS 1-1 supply power normally. The machine status and fault information of UPS1-2 are inspected by the dispatching software, and the equipment REPORT is deduced to confirm that there are no other abnormal alarms and start power off for maintenance. After replacing three output AC capacitors on site, engineers measured the old capacitors removed and found that the capacity of one of the AC capacitors decreased directly from the nominal 600UF to 0, and the capacitors were completely invalid.

2. When the output capacitor is replaced, an engineer disconnects the output switch of UPS1-2 and tests it by a single machine in manual mode. The output voltage of UPS1-2 is adjusted step by step, and the filter current of the output voltage and the AC capacitor is measured. All the indexes are normal. After the UPS1-2 is removed from the manual mode, the single machine runs normally.

3. After the maintenance of the various functional tests, we will UPS1-2 circuit breakers to restore the state and turn on the UPS1-2 inverter, but the UPS1-2 inverter lamp has been flickering, can not carry out parallel machine, test many times, occasionally successful parallel machine, but after closing the inverter button again can not parallel machine, it seems that UPS1-2 has no other failures Completely restored.

4. After analyzing the working principle and related circuits of this UPS, we suspect that the "switch circuit control board AROI" is abnormal, so we use the warehouse to remove the board for maintenance and replacement. After replacing the board, we need to rewrite the parameters and check the board. After completing the relevant operation and testing, the UPS runs normally and the UPS failures are completed. Repair.

Fault summary

1. It is suggested to replace the vulnerable parts of UPS equipment which has been running for more than 5 years to prevent the recurrence of similar faults. The vulnerable parts include AC filter capacitor, DC bus filter capacitor, fan, auxiliary power supply board and so on, so as to improve the reliability of equipment operation and prolong the service life of UPS.

2, for overdue use of UPS should be replaced in time, this set of UPS has reached the life expectancy time. Therefore, it is planned to carry out the cutting replacement this year, and the acceptance of the new UPS and the arrival of the cutting cable have been completed.

3. It is suggested that UPS products should be maintained in the original factory to ensure the depth of UPS equipment maintenance. At the same time, similar equipment hidden dangers can be prevented and eliminated in advance, fault responsiveness can be improved, and the time limit for fault site treatment can be accelerated.

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