电弧闪络计算器
估算电弧闪络能量及其个人防护装备类别。
Reads IEEE 1584-2002 and 2018. Tables checked 1 Oct 2026.
尝试一个工程 7
每项工作都会预填示例数值。请替换为您自己的数值。
- Estimate arc flash energy at an MCCThe incident energy at 455 mm from a 25 kA MCC, cleared in 0.15 s.
- Estimate arc flash at a main switchboardThe incident energy at 40 kA cleared in 0.3 s.
- Estimate arc flash at a distribution boardThe incident energy at 10 kA cleared in 0.1 s.
- Estimate arc flash in open airThe incident energy with no enclosure.
- Estimate arc flash at 11 kV switchgearThe incident energy at 11 kV and 12 kA.
- Find the boundary at a longer reachThe incident energy and arc flash boundary at a 600 mm working distance.
- Compare a faster clearing timeThe incident energy of a 25 kA fault cleared in 0.05 s.
输入
使用默认输入值的示例计算。
- 型号
- IEEE 1584-2018
- 系统电压
- 0.4 kV
- 金属性短路电流
- 20 kA
- 切断时间
- 0.2 s
- 降低电流下的切除时间
- 0 s
- 设备
- 开关设备
- 电极配置
- VCB：箱内垂直导体
- 电极间距
- 0 mm
- 外壳高度
- 0 mm
- 外壳宽度
- 0 mm
- 外壳深度
- 0 mm
- 工作距离
- 455 mm
入射能量
7.01cal/cm²
- 电弧电流
- 13.64kA
- 降低后的弧电流
- 11.9kA
- 电弧闪络边界
- 1,373.09mm
- PPE 类别
- 2
此结果仅供设计参考。请对照现行标准进行核验。
计算步骤
- 型号IEEE 1584-2018
IEEE 1584-2018 Cl 4
- 600 V 下的电弧电流16.27kA
IEEE 1584-2018 Cl 4
- 电极布置VCB
IEEE 1584-2018 Cl 4
- 电极间距32mm
IEEE 1584-2018 Cl 4
- 电弧电流13.64kA
IEEE 1584-2018 Cl 4
- 等效外壳尺寸20
IEEE 1584-2018 Cl 4
- 外壳尺寸修正系数×1.00
IEEE 1584-2018 Cl 4
- 全弧电流下的入射能量7.01cal/cm²
IEEE 1584-2018 Cl 4
- 电弧电流变化系数0.26
IEEE 1584-2018 Cl 4
- 降低的电弧电流11.9kA
IEEE 1584-2018 Cl 4
- 降低弧电流下的入射能量6.15cal/cm²
IEEE 1584-2018 Cl 4
- 入射能量，较高的一档结果7.01cal/cm²
IEEE 1584-2018 Cl 4
- 电弧闪络边界，取较高者1,373.09mm
IEEE 1584-2018 Cl 4
关于此计算器
How this is calculated
The tool estimates the incident energy of an arcing fault. It uses the IEEE 1584-2018 model. It can also run the 2002 model for older studies. IEEE 1584 is not an AS/NZS Standard, so the steps cite its clause only.
- Model. You pick the 2018 or the 2002 model. The 2018 model asks for the electrode configuration and the equipment. The 2002 model asks if the equipment is enclosed and earthed (Cl 4).
- Arcing current. The tool finds the arcing current at 600 V. It then corrects it to your voltage for the electrode gap.
- Enclosure. It works the equivalent enclosure size. It applies the enclosure size correction factor.
- Incident energy. It works the incident energy at the full arcing current. It uses your clearing time and working distance.
- Reduced current. It applies an arcing current variation factor. It works the incident energy again at that lower current.
- Result. The tool keeps the higher of the two passes. It gives the arc flash boundary and the PPE category.
| Step | Table or clause | What it decides |
|---|---|---|
| Arcing current | IEEE 1584-2018 Cl 4 | The current at your voltage and gap |
| Enclosure correction | IEEE 1584-2018 Cl 4 | The effect of the box size |
| Incident energy and boundary | IEEE 1584-2018 Cl 4 | The energy and the distance for the higher pass |
Worked example
- 400 V switchgear with a 20 kA bolted fault and a 0.2 s clearing time. The working distance is 455 mm. The tool gives an arcing current of 13.64 kA and an incident energy of 7.01 cal/cm². The boundary is 1,373.09 mm. The PPE category is 2.
Limits
- The 2018 model covers 208 V to 15 kV. Above 15 kV the tool uses the Lee model, which is a different method.
- The reduced current pass uses the same clearing time. Enter its own time from the device curve.
- The tool takes your bolted fault current and clearing time as given. Get them from a fault level study and the device curve.
- The result is an estimate. It is not a label and it is not a safe-work permit.
See also: Arc flash basics, Incident energy at a 400 V switchboard and Arc flash label for a commercial main switchboard.
问题
结果仅供设计参考。请依据现行标准核对。
电弧闪络计算器有什么作用？
本工具先估算电弧电流，再估算电弧闪络边界。它还估算工作距离处的入射能量，并报告该能量对应的个人防护装备类别。步骤中显示模型所用的每个数值。
它采用哪种模型？
新页面采用 IEEE 1584-2018 模型。若需与旧研究保持一致，可选择 2002。在 2018 模型推出前生成的链接或保存记录按 2002 读取，因此其结果不会改变。超过 15 kV 时两种模型均不适用，因此本工具采用 Lee 法并予以说明。
哪些输入最重要？
金属性短路电流和切断时间决定入射能量。工作距离同样重要，默认为 455 mm。在 2018 模型中，电极配置和外壳尺寸会改变能量。VCB（箱内垂直导体）是配电箱的常见情形。在 2002 模型中，封闭与接地设置会影响结果。
为何 2018 年模型会运行两次？
电弧电流因测试而异。因此工具也会以较低的电弧电流运行，此时装置可能动作更慢。它会报告较高的能量和较大的边界。若您的装置曲线在该电流下给出不同的时间，请输入该电流下的切断时间。
个人防护装备类别如何确定？
本工具根据入射能量确定类别。所用分界值为每平方厘米 1.2、4、8、25 和 40 卡路里。超过 40 时，结果报告为高于类别 4。输入参数保存在页面地址中，因此链接可以重现该分析案例。
计算示例
- IEEE 1584-2002: arc flash model and limitsWhat the IEEE 1584-2002 empirical model governs, where it stops applying, and a 400 V switchboard study that lands on 7.54 cal/cm² at 455 mm.
- Arc flash at a 48 V home batteryClass a 48 V lithium home battery with 6 kA at its terminals by AS/NZS 5139, find its arc flash energy and PPE level, then bring it down with fuses.
- Arc flash boundary at a motor control centreArcing current, incident energy and arc flash boundary for a 400 V MCC at 25 kA with a 0.1 s clearing time, and why the equipment type moves the result.
- Arc flash incident energy at a 400 V switchboardA 400 V board with 20 kA bolted fault and 0.2 s clearing gives 6.23 cal/cm² at 455 mm, an arcing current of 9.64 kA and a 1395.97 mm boundary.
背景
- Battery classes and arc flash in AS/NZS 5139How AS/NZS 5139 classes a battery system by hazard and decisive voltage class, works its arc flash energy, and sets the PPE, consequence and home limits.
- Arc flash basicsArcing current, incident energy, boundary and working distance explained, with three engine runs that show clearing time beating fault current every time.
本工具读取的条款和表格
- IEEE 1584-2018 Cl 4Arc flash incident energy, 2018 model
- IEEE 1584-2002 Cl 5Arc flash incident energy
- IEEE 1584-2018 Table 1Coefficients for the intermediate average arcing current
- IEEE 1584-2018 Table 2Coefficients for the arcing current variation correction factor
- IEEE 1584-2018 Table 7Enclosure size correction factor coefficients
- IEEE 1584-2018 Tables 3 to 5Coefficients for the intermediate incident energy and arc-flash boundary
- IEEE 1584-2018 Tables 8 and 10Typical bus gaps, enclosure sizes and working distances by equipment class
- IEEE 1584-2002 Cl 5.2–5.6Arc flash incident energy model coefficients
表格最后核对于 1 Oct 2026。
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