电气安全
一、电气安全基础 | Electrical Safety Fundamentals
二、电气危险与控制 | Electrical Hazards & Controls
三、上锁挂牌 | Lock-Out Tag-Out (LOTO)
四、电气PPE与工具 | Electrical PPE & Tools
五、光伏电气特有安全 | PV-Specific Electrical Safety
六、资质与合规 | Qualification & Compliance
场景一：逆变站中压开关柜LOTO程序 Inverter Station MV Switchgear LOTO Procedure We're isolating the MV switchgear CB-304 in Inverter Station F-04 for cable termination work. I've got the switching schedule approved and the electrical work permit issued. Authorized electrician: I need you to execute the LOTO sequence now.
隔离F-04逆变站中压开关柜CB-304做电缆端接。切换计划已批、电气 作业许可已发。授权电工:现在执行LOTO序列。
Electrician: (reads switching schedule) Step 1: open CB-304 at the local control panel. (opens) Breaker open — position indicator confirms "OPEN." Step 2: rack CB-304 out to the test/disconnected position. (racks out) Draw-out mechanism confirmed — breaker is now mechanically separated from the bus. Step 3: close and lock the shutter over the busbar contacts. Shutter locked with lock #1. Step 4: apply personal lock #A-47 to the racking mechanism — this prevents anyone from racking the breaker back in. Step 5: apply the "DANGER — DO NOT OPERATE" tag — signed, dated, with my name and the work order number WO-1182.
(读切换计划)步骤一:就地控制面板断开CB-304。(断开)断路器断开—— 位置指示器确认"OPEN"。步骤二:CB-304摇出至试验/隔离位置。(摇出) 抽出机构确认——断路器现已机械式脱离母线。步骤三:关闭并锁定母线 触头挡板。挡板以1号锁锁定。步骤四:摇进机构加个人锁#A-47——防止任 何人把断路器摇回去。步骤五:挂"DANGER——禁止操作"标签——签字、日期、 姓名及工单号WO-1182。
Good. Now the critical step: verify zero energy. Test your voltage detector on a known live source first.
好。关键一步:验证零能量。先在已知带电电源上验电器。
Electrician: Testing on the live side of the incoming breaker — detector indicates 13.8kV. Detector working. Now testing the cable terminals on the isolated side of CB-304: Phase A — 0V. Phase B — 0V. Phase C — 0V. All three phases confirmed dead. Applying personal ground set: Phase A to ground — Phase B to ground — Phase C to ground — all three phases grounded. Ground cable connected to the station earth bar. Lock #A-47 key placed in the group lock box. The cable termination crew can now collect their personal locks from the lock box and add them. The circuit is isolated, locked out, tagged out, tested dead, and grounded. Safe for work. Handing over the isolation certificate to you.
在进线断路器带电侧验——检测仪显示13.8kV。检测仪工作正常。现在 验CB-304隔离侧电缆端子:A相——0V。B相——0V。C相——0V。三相确认无 电。施加个人接地线组:A相对地——B相对地——C相对地——三相全部接地。 接地电缆接到站接地排。A-47锁钥匙放入集体锁箱。电缆端接班组现在可 以从锁箱取个人锁加上。回路已隔离、锁定、挂牌、验电、接地。可以安 全作业。隔离证书移交你。
场景二：光伏组串直流危险——不安全的组串测试 PV String DC Hazard — Unsafe String Testing
(arriving at Zone A PV array) Stop what you're doing. You're testing string open-circuit voltage with your multimeter probes directly on the MC4 connectors — in broad daylight, with the panels generating. That's 850V DC at up to 14 amps flowing through those connectors the moment you unplug them. You're not wearing arc-rated gloves, no arc-rated face shield, and you haven't de-energized the string. What procedure are you following?
(到A区光伏阵列)停下手里的活。你们在大白天、组件在发电时用万用 表探针直接测MC4接头的组串开路电压。一拔开接头就有850V DC高达14A 流过。没戴电弧级手套、没戴电弧级面罩、没对组串断电。你们执行什么 程序？
Just a quick volt check — we do it all the time. The strings are new, the connectors are clean. We were just checking polarity before connecting to the combiner box.
就快速测个电压——我们总这么干。组串是新的、接头干净。只是接到 汇流箱前查一下极性。
"We do it all the time" is how people get killed by DC arcs. PV modules are always live in daylight — you cannot turn them off. DC arcs don't self-extinguish like AC arcs — they sustain at high temperatures and can reach 4,000°C. An MC4 connector separation under load creates a sustained DC arc — that's a fire ignition source directly underneath a glass panel field. From now on, the procedure for string testing is: (1) cover the modules with opaque blankets to de-energize the string — you test in the dark or under cover. (2) wear 8 cal/cm² minimum arc-rated PPE — gloves, face shield, long-sleeve shirt. (3) use insulated test probes rated for 1500V DC with fused leads. (4) never separate a DC connector under load. I'm issuing a safety stand-down for all commissioning technicians this afternoon — 2-hour DC safety retraining. And I want these strings re-tested using the correct procedure. No exceptions.
"我们总这么干"就是人死于直流电弧的原因。光伏组件昼间永带电—— 关不掉。直流电弧不像交流电弧自行熄灭——持续高温、可达4000°C。有 载拔MC4接头产生持续直流电弧——那是玻璃面板阵列正下方的点火源。从 现在起、组串测试程序是:(1)用不透明毯覆盖组件对组串断电——暗处或 覆盖下测试。(2)穿戴最低8cal/cm²电弧级PPE——手套、面罩、长袖衫。 (3)使用额定1500V DC绝缘测试探针带熔断导线。(4)绝不有载分离直流 接头。今天下午对全体调试技术员发安全停工——2小时直流安全再培训。 这些组串要按正确程序重新测试。没有例外。