hansejc.github.io/earth.html at master · HansEJC/hansejc.github.io · GitHub

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<!DOCTYPE HTML>
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<html>
  <head>
    <title>Earthing Calculation Tools</title>
    <meta http-equiv="content-type" content="text/html; charset=utf-8" />
    <meta name="description" content="Earthing Calculation Tools" />
    <meta name="keywords" content="Earthing Calculation Tools" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no"/>
    <link rel="stylesheet" href="css/main-style.css"/>
    <script defer src="js/init.js"></script>
    <link rel="stylesheet" href="css/ext/katex.min.css">
    <script defer src="js/ext/katex.min.js"></script>
    <script defer src="js/ext/auto-render.min.js" onload="renderMathInElement(document.body);"></script>
    <script defer src="js/earthing.js"></script>
  </head>
  <body class="left-sidebar">
    <!-- Google Tag Manager (noscript) -->
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    height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
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    <!-- Header -->
    <div id="header">
      <div class="topnav" id="myTopnav"></div>
      <!-- Logo -->
      <div id="logo">
          <h1><a href="#">Earthing Calculation Tools</a></h1>
        </div>
    </div>
    <!-- Main -->
    <div id="main" class="container">
      <div class="row 50%">
        <div>
          <!-- Content -->
          <div id="content">
            <header>
                <h1>EPR and Fault Current Split</h1>
            </header>
            <div class="row 50%">
              <section class="box">
                <form>
                  Earth Impedance  (Ω)<input type="number" id="ER" value="2" />
                  Return Impedance (Ω)<input type="number" id="RR" value="0.18"/>
                  Parallel Impedance (Ω)<span id="PR" class="label "></span>
                </form>
              </section>
              <section class="box">
                <form>
                  Fault Current (kA)<input type="number" id="FC" value="8"/>
                  Return Current (kA)<span id="IR" class="label "></span>
                  Ground Return Current (kA)<span id="IG" class="label "></span>
                </form>
              </section>
              <section class="box">
                <form>
                  Earth Potential Rise (EPR)<span id="EPR" class="label"></span>
                  Return Current (%)<span id="IRp" class="label "></span>
                  Ground Return Current (%)<span id="IGp" class="label "></span>
                </form>
              </section>
            </div>
            <header>
                <h1>Earth Grid Calculations</h1>
            </header>
            <div class="row 50%">
              <section class="box">
                <form>
                  Ground Resistivity \(\rho\) (mΩ)<input type="number" id="P"/>
                  \(Area\) (m<sup>2</sup>)<input type="number" id="AREA"/>
                  Radius of Circular Plate<br>  of Same Area as Grid \(r\) (m)<span id="R" class="label "></span>
                  $$ r = \sqrt{Area \over \pi} $$
                </form>
              </section>
              <section class="box">
                <form>
                  Tape Depth \(h\) (m)<input type="number" id="H"/>
                  Total Tape Length \(L\) (m)<input type="number" id="L"/>
                  <!--Simplest Formula for <br>Earth Resistance \(R_e\) (Ω):-->
                  <style>#RE {display: none}</style>
                  <span hidden id="RE" class="label "></span>  <br>
                  Rod Factor \(K_R\)<span id="KR" class="label "></span>
                  $$ K_R= 1 + {{n_R \times {l_R}^2} \over {10r^2}} $$
                </form>
              </section>
              <section class="box">
                <form>
                  Rod Number \(n_R\) <input type="number" id="NR"/>
                  Rod Length \(l_R\) (m)<input type="number" id="LR"/>
                  Earth Resistance Calculated <br>with Rods \(R_G\) (Ω):
                  <span id="RG" class="label "></span>
                  <!--$$ R_e = {\rho \over 4r} + {\rho \over {1 + n_R \times l_R}} $$<br>-->
                  \[R_G=\rho  {\left({1+ {\left(r \over {r+2.5h}\right)} \over 8r \times K_R}+{1 \over L}\right)}\]
                </form>
              </section>
            </div>
            <header>
              <h1>Ground Resistivity Correction</h1>
            </header>
            <div class="row 50%">
              <section class="box">
                <form>
                  Earth Resistance \(R\) (Ω)<input type="number" id="ERA"/>
                </form>
              </section>
              <section class="box">
                <form>
                  Corrected Resistivity \(\rho_A\) (mΩ)<span id="PA" class="label "></span>
                </form>
              </section>
              <section class="box">
                <form>
                  <p>$$ \rho_A = {R \times \rho \over R_G} $$</p>
                </form>
              </section>
            </div>
          </div>
        </div>
      </div>
    </div>
    <div id="copyright">
      <ul>
        <li>&copy; Hans Juneby</li>
      </ul>
    </div>
  </body>
</html>