Overvoltage Limiters OPN 20 kV 1.2 C UHL1

Overvoltage limiters (OPN) are designed to protect the insulation of electrical installations in AC networks with a voltage of 20 kV, a frequency of 50 Hz, and an isolated neutral from switching and lightning overvoltages. The products comply with GOST R 52725-2021 and are manufactured according to TU 27.12.10–041–21639232-2020.

Technical Specifications:

• Nominal discharge current: 10 kA
• Explosion safety current:
  • duration of at least 1 second — at least 0.6 kA
  • duration of at least 0.2 seconds — at least 65 kA
• Residual voltage during lightning current impulses with a duration of 8/20 µs:
  • at 5 kA — 70.2 kV
  • at 10 kA — 76.8 kV
  • at 20 kA — 86.2 kV
• Residual voltage during switching currents with a duration of 30/60 µs:
  • at 125 A — 56.8 kV
  • at 250 A — 58.7 kV
  • at 500 A — 61.7 kV
  • at 1000 A — 83.7 kV
• Residual voltage during a steep current impulse of 10 kA with a duration of 1/10 µs: 83.7 kV
• Charge capacity: 1.2 C
• Impulse current 4/10 µs: 100 kA
• Classification voltage at 2 mA current: 30.2 kV
• Thermal energy: at least 4.0 kJ/kV