案例分享 | 地面电源无法给飞机供电
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<span style="line-height: 2em;color: #595959;white-space: pre-wrap;font-size: 12px;letter-spacing: 2.912px;">全世界只有不到</span><span style="line-height: 2em;font-size: 14px;"><strong><span style="font-size: 12px;"><span style="color: #ab1942;">1 %</span><span style="color: #407600;"> </span></span></strong></span><span style="line-height: 2em;color: #595959;white-space: pre-wrap;font-size: 12px;letter-spacing: 2.912px;">的人关注了九品机务</span>
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<span style="line-height: 2em;color: #595959;white-space: pre-wrap;font-size: 12px;letter-spacing: 2.912px;">你真是个特别的人</span>
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<span style="font-size: 14px;letter-spacing: 0.476px;">某日航前,一架双电瓶构型的NG飞机无法使用地面电源给飞机供电,怀疑电瓶严重亏电,检查发现主电瓶电压11V,辅助</span><span style="font-size: 14px;letter-spacing: 0.476px;">电瓶电压25.8V,对调主辅电瓶后可以接通地面电源。</span>
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<span style="font-size: 14px;"><span style="font-family: 等线;font-size: 14px;letter-spacing: 0.578px;">电源系统的逻辑十分复杂</span><span style="font-family: 等线;font-size: 14px;letter-spacing: 0.578px;">,在此我们仅简述有关于本案例的相关原理。</span></span>
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为什么主电瓶没电时地面电源无法给飞机供电?
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<span style="font-family: 等线;font-size: 10.5pt;">带着这个疑问,我们开始查阅SDS和SSM。</span>
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<span style="font-family: 等线;font-size: 10.5pt;">这是一张电源系统分配的总述图</span><span style="font-family: 等线; font-size: 10.5pt;">,</span><span style="font-family: 等线; font-size: 10.5pt;">高亮显示的部</span><span style="font-family: 等线; font-size: 10.5pt;">分就是本案例中最核心的部分。</span>
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<span style="font-size: 10.5pt;font-family: 等线;">当AC XFR BUS 1&2有电的时候,飞机可以正常供电。</span>
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<span style="font-size: 10.5pt;font-family: 等线;">如图,当EXT PWR接入飞机时,EPC和BTB1&2必须闭合,才能使飞机得到供电。也就是说,如果AC XFR BUS没有电,要么是EPC没有闭合,要么是BTB1&2没有闭合。</span><span style="font-family: 等线;font-size: 10.5pt;"></span>
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<span style="font-family: 等线;font-size: 10.5pt;">这张图体现了EPC和BTB的控制关系,从此图可知,EPC是由BPCU控制的,BTB是由GCU控制。</span><span style="font-family: 等线;font-size: 10.5pt;"></span>
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<span style="font-family: 等线;font-size: 10.5pt;">我们先看BPCU是如何控制EPC的。在SSM</span><span style="font-family: 等线;font-size: 10.5pt;">24-41-11</span><span style="font-family: 等线;font-size: 10.5pt;">可以看出相关控制逻辑。</span>
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<span style="font-family: 等线;font-size: 10.5pt;">B</span><span style="font-family: 等线;font-size: 10.5pt;">PCU</span><span style="font-family: 等线;font-size: 10.5pt;">通过控制EPC中的继电器,来控制EPC上相关的电路。如图,蓝线为EPC继电器供电,黄线为EPC继电器接地,可以看出,BPCU主要是控制接地逻辑从而控制继电器。</span><span style="font-family: 等线;font-size: 10.5pt;"></span>
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<span style="font-family: 等线;font-size: 10.5pt;">我们将<strong>接地部分</strong>放大来看。</span><span style="font-family: 等线;font-size: 10.5pt;"></span>
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<span style="font-family: 等线; font-size: 10.5pt;">这是一个</span><span style="font-family: 等线; font-size: 10.5pt;">“与”门电路,只要这6个逻辑同时“1”即可接地。</span>
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<strong><em><span style="font-family: 等线;font-size: 10.5pt;">OC</span></em></strong><strong><em><span style="font-family: 等线;font-size: 10.5pt;"></span></em></strong>
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<span style="font-family: 等线;font-size: 10.5pt;">OC为OVERCURENT的缩写,如图,OC</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">OK</span><span style="font-family: 等线;font-size: 10.5pt;">=1</span><span style="font-family: 等线;font-size: 10.5pt;">的逻辑是任一相上的电流小于3</span><span style="font-family: 等线;font-size: 10.5pt;">35</span><span style="font-family: 等线;font-size: 10.5pt;">±</span><span style="font-family: 等线;font-size: 10.5pt;">15</span><span style="font-family: 等线;font-size: 10.5pt;">A,EXT</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">PWR</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">CT给出相关数据。</span><span style="font-family: 等线;font-size: 10.5pt;"></span>
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<strong><em><span style="font-family: 等线;font-size: 10.5pt;">PWR</span></em></strong><strong><em><span style="font-family: 等线;font-size: 10.5pt;"> </span></em></strong><strong><em><span style="font-family: 等线;font-size: 10.5pt;">QTY</span></em></strong><strong><em><span style="font-family: 等线;font-size: 10.5pt;"></span></em></strong>
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<span style="font-family: 等线;font-size: 10.5pt;">PWR</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">QTY</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">OK</span><span style="font-family: 等线;font-size: 10.5pt;">=1</span><span style="font-family: 等线;font-size: 10.5pt;">就是电源品质没问题,满足要求。</span><span style="font-family: 等线;font-size: 10.5pt;"></span>
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<strong><em><span style="font-family: 等线;font-size: 10.5pt;">NO</span></em></strong><strong><em><span style="font-family: 等线;font-size: 10.5pt;"> </span></em></strong><strong><em><span style="font-family: 等线;font-size: 10.5pt;">LOCKOUT</span></em></strong><strong><em><span style="font-family: 等线;font-size: 10.5pt;"></span></em></strong>
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<span style="font-family: 等线;font-size: 10.5pt;">NO</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">LOCKOUT</span><span style="font-family: 等线;font-size: 10.5pt;">=1</span><span style="font-family: 等线;font-size: 10.5pt;"> 就是外电源面板上的E&F钉短接,E和F两个钉是比较短的,如果E和F短接正常,代表外电源插头连接可靠。</span><span style="font-family: 等线;font-size: 10.5pt;"></span>
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<strong><em><span style="font-family: 等线;font-size: 10.5pt;">GPS</span></em></strong><strong><em><span style="font-family: 等线;font-size: 10.5pt;"> </span></em></strong><strong><em><span style="font-family: 等线;font-size: 10.5pt;">ON</span></em></strong><strong><em><span style="font-family: 等线;font-size: 10.5pt;"></span></em></strong>
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<span style="font-family: 等线;font-size: 10.5pt;">GPS</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">ON</span><span style="font-family: 等线;font-size: 10.5pt;">=1</span><span style="font-family: 等线;font-size: 10.5pt;">,GROUND</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">POWER</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">SWITCH到ON位。</span><span style="font-family: 等线;font-size: 10.5pt;"></span>
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<strong><em><span style="font-family: 等线;font-size: 10.5pt;">DEAD</span></em></strong><strong><em><span style="font-family: 等线;font-size: 10.5pt;"> </span></em></strong><strong><em><span style="font-family: 等线;font-size: 10.5pt;">BUS</span></em></strong><strong><em><span style="font-family: 等线;font-size: 10.5pt;"> </span></em></strong><strong><em><span style="font-family: 等线;font-size: 10.5pt;"></span></em></strong>
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<span style="font-family: 等线;font-size: 10.5pt;">DEAD</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">BUS</span><span style="font-family: 等线;font-size: 10.5pt;">=1</span><span style="font-family: 等线;font-size: 10.5pt;">的逻辑是两个BTB上游没有电。</span><span style="font-family: 等线;font-size: 10.5pt;"></span>
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<strong><em><span style="font-family: 等线;font-size: 10.5pt;">APB</span></em></strong><strong><em><span style="font-family: 等线;font-size: 10.5pt;"> </span></em></strong><strong><em><span style="font-family: 等线;font-size: 10.5pt;">TRIP</span></em></strong><strong><em><span style="font-family: 等线;font-size: 10.5pt;"></span></em></strong>
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<span style="font-family: 等线;font-size: 10.5pt;">APB</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">TRIP</span><span style="font-family: 等线;font-size: 10.5pt;">=1</span><span style="font-family: 等线;font-size: 10.5pt;">,即APB跳开,也是保证BTB上游没有电。</span>
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<span style="font-family: 等线;font-size: 10.5pt;">以上是接地逻辑,接下来看继电器的<strong>供电</strong>。</span>
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<span style="font-family: 等线;font-size: 10.5pt;">继电器的供电有三个来源:</span><span style="font-family: 等线; font-size: 10.5pt;">DC</span><span style="font-family: 等线; font-size: 10.5pt;"> </span><span style="font-family: 等线; font-size: 10.5pt;">BUS</span><span style="font-family: 等线; font-size: 10.5pt;"> 1 </span><span style="font-family: 等线; font-size: 10.5pt;">、DC</span><span style="font-family: 等线; font-size: 10.5pt;"> </span><span style="font-family: 等线; font-size: 10.5pt;">SW</span><span style="font-family: 等线; font-size: 10.5pt;"> </span><span style="font-family: 等线; font-size: 10.5pt;">HOT</span><span style="font-family: 等线; font-size: 10.5pt;"> </span><span style="font-family: 等线; font-size: 10.5pt;">BAT</span><span style="font-family: 等线; font-size: 10.5pt;"> </span><span style="font-family: 等线; font-size: 10.5pt;">BUS</span><span style="font-family: 等线; font-size: 10.5pt;"> SECT 2</span><span style="font-family: 等线; font-size: 10.5pt;">和BPCU内部TR。</span>
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<span style="font-size: 10.5pt;font-family: 等线;">由于本例中电瓶没电,</span><span style="font-size: 10.5pt; font-family: 等线;">地面电源插上后,通过下图</span><span style="font-family: 等线; font-size: 10.5pt;">蓝色线路,BPCU和继电器的供电都是没有问题的,所以EPC是能闭合的。</span>
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<span style="font-family: 等线;font-size: 10.5pt;">我们再看BTB。</span><span style="font-family: 等线;font-size: 10.5pt;"></span>
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<span style="font-family: 等线;font-size: 10.5pt;">与BPCU不同,GCU是通过控制BTB继电器的供电,来实现对BTB的控制的。</span><span style="font-family: 等线; font-size: 10.5pt;">这个图来自SSM</span><span style="font-family: 等线; font-size: 10.5pt;">24-23-21</span><span style="font-family: 等线; font-size: 10.5pt;">,控制逻辑有点复杂,我们先看供电来源,因为案例中电瓶是没有电的,而此图中的供电刚好是2</span><span style="font-family: 等线; font-size: 10.5pt;">8</span><span style="font-family: 等线; font-size: 10.5pt;">VDC,所以猜测是因为电瓶没电而提供不了供电,从而导致BTB没办法闭合。</span>
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<span style="font-family: 等线;font-size: 10.5pt;">为了验证猜测,我们继续查找。</span><span style="font-family: 等线;font-size: 10.5pt;"></span>
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<span style="font-family: 等线;font-size: 10.5pt;"></span><span style="font-family: 等线; font-size: 10.5pt;">此图来自SSM</span><span style="font-family: 等线; font-size: 10.5pt;">24-21-21</span><span style="font-family: 等线; font-size: 10.5pt;">,图上高亮部分显示GCU供电来源只有BAT</span><span style="font-family: 等线; font-size: 10.5pt;"> </span><span style="font-family: 等线; font-size: 10.5pt;">BUS</span><span style="font-family: 等线; font-size: 10.5pt;"> </span><span style="font-family: 等线; font-size: 10.5pt;">和IDG,SDS</span><span style="font-family: 等线; font-size: 10.5pt;">24-20-00</span><span style="font-family: 等线; font-size: 10.5pt;">上也有相关描述。</span>
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<span style="font-family: 等线; font-size: 10.5pt;">这就验证了我们的猜测——</span><span style="font-family: 等线; font-size: 10.5pt;">在主电瓶没电的情况下,B</span><span style="font-family: 等线; font-size: 10.5pt;">TB</span><span style="font-family: 等线; font-size: 10.5pt;">没办法闭合,导致EXT</span><span style="font-family: 等线; font-size: 10.5pt;"> </span><span style="font-family: 等线; font-size: 10.5pt;">PWR不能被供到飞机电网上。</span>
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辅助电瓶不参与供电吗?
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<span style="font-family: 等线;font-size: 10.5pt;">飞机电瓶放电时,是飞机的航后状态,即电瓶电门OFF,飞机没有任何外部连接,惯导和应急灯也是OFF,在此状态下,辅助电瓶在电路中是什么状态呢?</span><span style="font-family: 等线;font-size: 10.5pt;"></span>
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<span style="font-family: 等线;font-size: 10.5pt;">这张图来自SSM</span><span style="font-family: 等线;font-size: 10.5pt;">24-31-11</span><span style="font-family: 等线;font-size: 10.5pt;">,主电瓶直接向BAT</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">BUS</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">BAR供电,辅助电瓶通过DUAL</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">BATTERY</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">RCCB连接到BAT</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">BUS</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">BAR上,SPCU通过控制地信号控制DUAL</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">BATTERY</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">RCCB的开合。</span>
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<span style="font-family: 等线;font-size: 10.5pt;">我们看下具体逻辑图。</span><span style="font-family: 等线;font-size: 10.5pt;"></span>
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<span style="font-family: 等线;font-size: 10.5pt;">由图可知,</span><span style="font-family: 等线; font-size: 10.5pt;">DUAL</span><span style="font-family: 等线; font-size: 10.5pt;"> </span><span style="font-family: 等线; font-size: 10.5pt;">BATTERY</span><span style="font-family: 等线; font-size: 10.5pt;"> </span><span style="font-family: 等线; font-size: 10.5pt;">RCCB闭合的条件是K1或K</span><span style="font-family: 等线; font-size: 10.5pt;">3</span><span style="font-family: 等线; font-size: 10.5pt;">任一吸合且APU没有启动。</span><span style="font-family: 等线; font-size: 10.5pt;">通过查询SDS,可知K</span><span style="font-family: 等线; font-size: 10.5pt;">1</span><span style="font-family: 等线; font-size: 10.5pt;">和K</span><span style="font-family: 等线; font-size: 10.5pt;">3</span><span style="font-family: 等线; font-size: 10.5pt;">的<span style="letter-spacing: 0.476px;">吸合</span>条件。</span>
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<span style="font-family: 等线;font-size: 10.5pt;">K</span><span style="font-family: 等线;font-size: 10.5pt;">1</span><span style="font-family: 等线;font-size: 10.5pt;">和K</span><span style="font-family: 等线;font-size: 10.5pt;">3</span><span style="font-family: 等线;font-size: 10.5pt;">的<span style="letter-spacing: 0.476px;">吸合</span>都需要电瓶电门到ON位,所以在航后状态,DUAL</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">BATTERY</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">RCCB不存在闭合条件,辅助电瓶不能通过DUAL</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">BATTERY</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">RCCB连接到BAT</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">BUS</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">BAR上,也就是说只有主电瓶在BAT</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">BUS</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">BAR上。</span><span style="font-family: 等线;font-size: 10.5pt;"></span>
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<span style="font-family: 等线;font-size: 10.5pt;">那在本案例中的航前状态,辅助电瓶能不能给BAT</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">BUS</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">BAR供电呢?从现象看我们已经知道了,是不能的,让我们来验证下。</span><span style="font-family: 等线;font-size: 10.5pt;"></span>
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<span style="font-family: 等线;font-size: 10.5pt;">首先,本案例中的航前状态下,K</span><span style="font-family: 等线;font-size: 10.5pt;">1</span><span style="font-family: 等线;font-size: 10.5pt;">和K</span><span style="font-family: 等线;font-size: 10.5pt;">3</span><span style="font-family: 等线;font-size: 10.5pt;">的<span style="letter-spacing: 0.476px;">吸合</span>条件是都满足了的,APU也没有启动,DUAL</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">BATTERY</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">RCCB的闭合条件全都达到了,但为什么没有闭合呢?</span><span style="font-family: 等线;font-size: 10.5pt;"></span>
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<span style="font-family: 等线;font-size: 10.5pt;">这两张图解答了疑问,K</span><span style="font-family: 等线;font-size: 10.5pt;">1</span><span style="font-family: 等线;font-size: 10.5pt;">和K</span><span style="font-family: 等线;font-size: 10.5pt;">3</span><span style="font-family: 等线;font-size: 10.5pt;">虽然满足了<span style="letter-spacing: 0.476px;">吸合</span>条件,但由于控制线圈是由BAT</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">BUS供电的,因此没办法真正的<span style="letter-spacing: 0.476px;">吸合</span>,所以DUAL</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">BATTERY</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">RCCB也就不能真正的闭合。</span><span style="font-family: 等线;font-size: 10.5pt;"></span>
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<span style="font-family: 等线;font-size: 10.5pt;">或许RCCB的闭合作动也需要BAT</span><span style="font-family: 等线;font-size: 10.5pt;"> </span><span style="font-family: 等线;font-size: 10.5pt;">BAR的电,这里就不再验证了,有兴趣的可以自行验证。</span>
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<strong><span style="color: #ffffff;">为什么电瓶会亏电?</span></strong>
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<span style="font-family: 等线;font-size: 10.5pt;">当电瓶接入电网时,会有一些STANDBY的系统耗电,随着温度变化和使用时间的增加,电瓶电压也会变低。我们通过查看飞机的电气负载分析文件,可以知道在航后状态下,负载的电流是</span><span style="font-family: 等线;font-size: 10.5pt;">0.133</span><span style="font-family: 等线;font-size: 10.5pt;">A,不同的飞机这个值可能是不同的,但应该不会差太多。</span><span style="font-family: 等线;font-size: 10.5pt;"></span>
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<span style="font-family: 等线;font-size: 10.5pt;">我们的电瓶一般充满电是2</span><span style="font-family: 等线;font-size: 10.5pt;">6</span><span style="font-family: 等线;font-size: 10.5pt;">V,容量为5</span><span style="font-family: 等线;font-size: 10.5pt;">3</span><span style="font-family: 等线;font-size: 10.5pt;">Ah左右, 2</span><span style="font-family: 等线;font-size: 10.5pt;">4</span><span style="font-family: 等线;font-size: 10.5pt;">H消耗的电量是</span><span style="font-family: 等线; font-size: 10.5pt;">0</span><span style="font-family: 等线; font-size: 10.5pt;">.133 </span><span style="font-family: 等线; font-size: 10.5pt;">* </span><span style="font-family: 等线; font-size: 10.5pt;">24=3.192</span><span style="font-family: 等线; font-size: 10.5pt;">Ah。</span><span style="font-family: 等线; font-size: 10.5pt;">假如放电曲线是线性的,</span><span style="font-family: 等线; font-size: 10.5pt;">总容量</span><span style="font-family: 等线; font-size: 10.5pt;">/消耗电量=总电压/电压下降量,</span><span style="font-family: 等线; font-size: 10.5pt;">2</span><span style="font-family: 等线; font-size: 10.5pt;">4</span><span style="font-family: 等线; font-size: 10.5pt;">H电压下降为</span><span style="font-family: 等线; font-size: 10.5pt;">26 * 3.192</span><span style="font-family: 等线; font-size: 10.5pt;">/</span><span style="font-family: 等线; font-size: 10.5pt;">53=1.566</span><span style="font-family: 等线; font-size: 10.5pt;">V。</span><span style="font-family: 等线; font-size: 10.5pt;">这么大概算一下,HOT</span><span style="font-family: 等线; font-size: 10.5pt;"> </span><span style="font-family: 等线; font-size: 10.5pt;">BAT</span><span style="font-family: 等线; font-size: 10.5pt;"> </span><span style="font-family: 等线; font-size: 10.5pt;">BUS上的负载耗电还不小,所以飞机长时间停场时需要断开电瓶插头或者将电瓶拆下放在温暖的室内以防严重亏电。</span><span style="text-align: center; font-size: var(--articleFontsize);"></span>
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<strong>/End.</strong>
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