Overvoltage Limiter OPN-P 500 kV 4.0 C

The nonlinear overvoltage limiter (OPN) is designed to protect the insulation of electrical installations in AC networks with a voltage of 500 kV, a frequency of 50 Hz, and an effectively grounded neutral from switching and lightning overvoltages. The product complies with GOST R 52725-2021 and is manufactured according to TU 27.12.10-058-21639232-2022.

Technical Specifications:

• Nominal discharge current: 20 kA
• Capacity class: 5
• 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
• Impulse current 4/10 µs: 100 kA
• Climatic design and placement category according to GOST 15150: UHL1
• External insulation design: for areas with pollution degree III

Residual Voltage Parameters:

• During lightning current impulses with a duration of 8/20 µs:
  • at 10 kA — 879 kV
  • at 20 kA — 966 kV
  • at 40 kA — 1080 kV
• During switching currents with a duration of 30/60 µs:
  • at 500 A — 734 kV
  • at 1000 A — 751 kV
  • at 2000 A — 788 kV
• During a steep current impulse of 10 kA with a duration of 1/10 µs: 1070 kV

Additional Characteristics:

• Charge capacity: 4.0 C
• Classification voltage at 2 mA current: 412 kV
• Thermal energy: at least 10.0 kJ/kV
• Active power loss: at least 7.1 kJ
• Creepage distance: 1316 cm