diff --git a/main.py b/main.py
index 0d463f6..ce4be50 100644
--- a/main.py
+++ b/main.py
@@ -48,6 +48,7 @@ def egm():
         para.h_arm = toml_parameter["h_arm"]
         para.altitude = toml_parameter["altitude"]
         para.max_i = toml_parameter["max_i"]
+        para.rated_voltage = toml_parameter["rated_voltage"]
         toml_optional = toml_dict["optional"]
         para.voltage_n = toml_optional["voltage_n"]  # 工作电压分成多少份来计算
     #########################################################
@@ -296,7 +297,14 @@ def egm():
                 #     if abs(calculus-0.05812740052770032)<1e-5:
                 #         abc=123
                 #         pass
-                n_sf = 2 * ng / 10 * calculus * arc_possibility(750, insulator_c_len)
+                rated_voltage = para.rated_voltage
+                n_sf = (
+                    2
+                    * ng
+                    / 10
+                    * calculus
+                    * arc_possibility(rated_voltage, insulator_c_len)
+                )
                 avr_n_sf += n_sf / voltage_n
                 n_sf_phases[phase_conductor_foo][u_bar] = n_sf
                 logger.info(f"工作电压为{u_ph:.2f}kV时,跳闸率是{n_sf:.6}")