Power line filter for transient and continuous noise suppression

A power line filter having first and second line terminals providing a line voltage and first and second load terminals, said filter receiving a transient over first through fourth time periods and receiving long-term broad spectrum continuous interference, and comprising:

• continuous suppression and dissipation means, connected between said first and second line terminals and said first and second load terminals, for dissipating the continuous interference, storing part of the energy of the transient during the first through third time periods, and dissipating another part of the energy of the transient during the first through fourth time periods;
• and
• transient suppression means, connected between said first and second line terminals, for shunting the transient including the energy stored by said continuous suppression means and clamping the line voltage, said transient suppression means comprising:
• first clamping means, connected between the first and second line terminals, for shunting a part of the energy of the transient and clamping the line voltage during the second and third time periods, said first clamping means comprising a selenium surge suppressor having an energy dissipation capability of at least 800 joules;
• second clamping means, connected between the first and second line terminals, for shunting a part of the energy of the transient and clamping the line voltage in conjunction with said first clamping means during the third time period;
• and
• shunt means, connected between the first and second line terminals, for shunting part of the energy of the received transient during the fourth time period and turning off said first and second clamping means at the beginning of the fourth time period.

A power line filter for dissipating a transient, for clamping a line voltage and for continuous interference suppression on a three-phase power system having first, second and third line phases and a neutral, each phase and neutral pair including first and second line terminals providing a line voltage and first and second load terminals, said filter receiving a transient over first through fourth time periods and receiving long-term broad spectrum interference, said filter comprising:

• first, second and third power line filter modules, said first power line filter module connected to the first phase and neutral, said second power line filter module connected to the second phase and neutral, and said third power line filter module connected to the third phase and neutral, each of said power line filter modules comprising:
• transient suppression means, connected between the respective phase and neutral, for shunting the transient and clamping the line voltage, said transient suppression means comprising:
• first clamping means, connected between the first and second line terminals, for shunting a part of the energy of the transient and clamping the line voltage during the second and third time periods, said first clamping means comprising a selenium surge suppressor having a dissipation capability of at least 800 joules;
• second clamping means, connected between the first and second line terminals, for shunting a part of the energy of the transient and clamping the line voltage in conjunction with said first clamping means during the third time period;
• and
• shunt means, connected between the first and second line terminals, for shunting part of the energy of the transient during the fourth time period and turning off said first and second clamping means at the beginning of the fourth time period;
• and
• continuous suppression and dissipation means, operatively connected to the respective phase and neutral, for dissipating the continuous interference, storing part of the energy of the transient during the first through third time periods and dissipating another part of the energy of the transient during the first through fourth time periods, and said transient suppression means shunting the stored energy during the second through the fourth time periods.

A power line filter for dissipating a transient, for clamping a line voltage and for continuous interference suppression on a three-phase delta power system having first, second and third phases, each phase including first and second line terminals providing a line voltage and first and second load terminals, said filter receiving a transient over first through fourth time periods and receiving long-term broad spectrum continuous interference, said filter comprising:

• first, second and third power line filter modules, said first power line filter module connected to the first and second phases, said second power line filter module connected to the second and third phases and said third power line filter module connected to the first and third phases, each of said power line filter modules comprising:
• transient suppression means, connected between the first and second line terminals, for shunting the transient and clamping the line voltage, said transient suppression means comprising:
• first clamping means, connected between the first and second line terminals, for shunting a part of the energy of the transient and clamping the line voltage during the second time period, said first clamping means comprising a selenium surge suppressor having an energy dissipation capability of at least 800 joules;
• second clamping means, connected between the first and second line terminals, for shunting a part of the energy of the transient and clamping the line voltage in conjunction with said first clamping means during the third time period;
• and
• shunt means, operatively connected between the first and second line terminals, for shunting part of the energy of the transient during the fourth time period and turning off said first and second clamping means at the beginning of the fourth time period;
• and
• continuous suppression and dissipation means, operatively connected to the respective phase and neutral, for dissipating continuous interference, storing part of the energy of the transient during the first through third time periods and dissipating another part of the energy during the first through fourth time periods, and said transient suppression means shunting the stored energy during the second through fourth time periods.

A direct current power line filter having first and second line terminals providing a line voltage and first and second load terminals, said filter receiving a transient over first through third time periods and receiving long-term broad hard continuous interference, and comprising:

• transient suppression means, connected between said first and second line terminals, for shunting the transient and clamping the line voltage, said transient suppression means comprising:
• first clamping means, connected to the first and second line terminals, for shunting a part of the energy of the transient and clamping the line voltage during the second and third time periods, said first clamping means comprising a selenium surge suppressor having an energy dissipation capability of at least 800 joules;
• and
• second clamping means, connected to the first and second line terminals, for shunting part of the energy of the transient and clamping the line voltage in conjunction with said first clamping means during the third time period;
• and
• continuous suppression and dissipation means, connected between said first and second line terminals and said first and second load terminals, for dissipating the continuous interference, storing part of the energy of the transient during the first through second time periods and dissipating another part of the energy of the transient during the first through third time periods, and said transient suppression means shunting the stored energy during the second through fourth time periods.