Industrial EMP Solutions- Dr. V. Gurevich

HEMP Protection System for High Power Transformer

Geomagnetically induced current (GIC) arising from a high-altitude nuclear explosion (component E3 of the HEMP). This is a quasi-direct current, ranging in size from several tens to several hundred Amperes, which leads to saturation of the transformer core, a sharp decrease in its impedance and unacceptable overheating. In addition, there are a bulk of harmonics in the network. This protection system is designed to protect power transformers with grounded neutral of all power and voltage classes.

Tester for Checking the Operability of the HEMP Protection System of Power Transformers

In order to be sure of the serviceability of the protection system of the power transformer, it is necessary to systematically (once a year or once every two years) check it. For simple and convenient performance of such a test, special testers are designed that are connected via a small connector to the sensor of the transformer protection system.

EMI/HEMP Protection Modules for Critical Electronic Equipment Powered by Ungrounded DC Networks

All critical electronic devices are equipped with their own EMI filters and surge voltage suppressors in their internal power supplies. However, when such apparatus is powered by ungrounded DC electrical network, then such built-in elements protection against electromagnetic impacts turns out to be ineffective. Because of this, many critical and expensive electronic devices fail that should not have failed. Individual EMI filters on the market are also ineffective in ungrounded DC networks. Protective Modules are specifically designed to protect critical electronic equipment against powerful electromagnetic impacts distributed over ungrounded DC power supply networks 125V/250V in power plants, substations, industrial plants, such as switching interference and surge voltages, induced interference, etc., from which conventional protection elements cannot protect.

Backup Power Supply for DC Main Simulation

After exposure to HEMP, there is a need to check the serviceability of electronic equipment before actuating. To do this, we need a power supply that simulates a conventional auxiliary DC power system. This compact backup power supply protected from HEMP and is capable of supply up to 25A at 237V. Among other things, such a power supply is very convenient to use when checking, repairing and adjusting the equipment of stations and substations. Such a source is needed in every laboratory, in every substation.

Protection Modules for Analog Current and Voltage Measurement Circuits of Digital Protective Relays

The multi-kilometer wires of overhead power lines are huge antennas that collect HEMP electromagnetic energy from a large area and deliver it through the current and voltage transformer’s capacitances to the Digital Protective Relays (DPR) analog current and voltage inputs. Long cables running through the substations and connecting secondary circuits of high-voltage current and voltage transformers to DPR are also good antennas. Therefore, the protection of DPR analog current and voltage circuits from HEMP is an important task.

HEMP Protection Module for Telecommunications

• Telecommunications are widely used in relay protection systems and other important systems at substations, power plants, and water supply systems. As a rule, it is based on 10 Base-T and 10/100 Base-TX Ethernet (IEEE 802.2). Complex equipment that provides transmission and premium data in such a system contains microprocessors and other electronic chips operating at very low voltages, that is, it is very sensitive to electrical influences. This is the most vulnerable part of the infrastructure, which requires special high-effective HEMP protection. Moreover, such protection should not affect the work of telecommunication. This is just such a module.

• ADDITION DEVELOPMENTS

  Critical UPS Bypassing and Diagnose Tools

  Special Means
  for Backup High Power Diezel
  Generator Protection

  HEMP
  Filter for Grounding Circuit (without violating
  safety requirements)

  Automatic HEMP Protected
  Reserve Charger for Auxiliary DC Power Supply
  System