Direct current circuit breaker

A direct current circuit breaker, comprising:

• n in number mechanical switches connected in series;
• one energy-absorbing and voltage-limiting module connected in parallel to the n in number mechanical switches;
• a trigger module;
• and
• one commutation branch circuit connected in parallel to the n in number mechanical switches;
• wherein
• the one commutation branch circuit comprises a charging commutation module and a commutation capacitor which are connected in series;
• the charging commutation module is configured to charge up the commutation capacitor and produce reverse current to cut off the n in number mechanical switches;
• the one energy-absorbing and voltage-limiting module is configured to absorb energy stored in inductive elements of power systems after a fault current is cut off, so as to limit voltage and protect the mechanical switches;
• the trigger module is connected in parallel to the one charging commutation module, and is configured to trigger and turn on the one charging commutation module after faults;
• and
• n is a positive integer greater than or equal to 1.

A direct current circuit breaker, comprising:

• n in number circuit breaker modules connected in series;
• n in number energy-absorbing and voltage-limiting modules connected in parallel to the n in number circuit breaker modules, respectively;
• and
• a trigger module;
• wherein
• the n in number circuit breaker modules each comprise a mechanical switch and a commutation branch circuit which are connected in parallel;
• each commutation branch circuit comprises a charging commutation module and a commutation capacitor which are connected in series;
• the charging commutation module is configured to charge up the commutation capacitor and produce reverse current to cut off the mechanical switch;
• the n in number energy-absorbing and voltage-limiting modules are configured to absorb energy stored in inductive elements of power systems after a fault current is cut off, so as to limit voltage and protect the mechanical switch;
• the trigger module is connected in parallel to n in number charging commutation modules, and is configured to trigger and turn on the n in number charging commutation modules after faults;
• and
• n is a positive integer greater than or equal to 1.

A direct current circuit breaker, comprising:

• n in number mechanical switches connected in series;
• n in number energy-absorbing and voltage-limiting modules connected in parallel to the n in number mechanical switches, respectively;
• a trigger module;
• and
• one commutation branch circuit connected in parallel to the n in number mechanical switches;
• wherein
• the one commutation branch circuit comprises a charging commutation module and a commutation capacitor which are connected in series;
• the charging commutation module is configured to charge up the commutation capacitor and produce reverse current to cut off the mechanical switches;
• the n in number energy-absorbing and voltage-limiting modules are configured to absorb energy stored in inductive elements of power systems after a fault current is cut off, so as to limit voltage and protect the mechanical switches;
• the trigger module is connected in parallel to the charging commutation module, and is configured to trigger and turn on the charging commutation module after faults;
• and
• n is a positive integer greater than or equal to 1.

A direct current circuit breaker, comprising:

• n in number circuit breaker modules connected in series;
• one energy-absorbing and voltage-limiting module which is connected in parallel to the n in number circuit breaker modules;
• one forward trigger module;
• and
• one reverse trigger module;
• wherein
• each circuit breaker module comprises a mechanical switch and a commutation branch circuit which is connected in parallel to the mechanical switch;
• the commutation branch circuit comprises a forward charging commutation module, a commutation capacitor, and a reverse charging commutation module which are connected in series in that order;
• the forward charging commutation module is configured to produce a reverse current in the commutation branch circuit through the coupling reactor to realize the zero-crossing turn-off of the mechanical switch after a forward fault happens;
• the reverse charging commutation module is configured to produce a reverse current in the commutation branch circuit through the coupling reactor to realize the zero-crossing turn-off of the mechanical switch after a reverse fault happens;
• the one energy-absorbing and voltage-limiting module is configured to absorb energy stored in inductive elements of power systems after a fault current is cut off, so as to limit voltage and protect the mechanical switch;
• the forward trigger module is connected in parallel to forward charging commutation modules of the n in number circuit breaker modules and is configured to turn on the forward charging commutation modules when a forward fault happens;
• the reverse trigger module is connected in parallel to reverse charging commutation modules of the n in number circuit breaker modules and is configured to turn on the reverse charging commutation modules when a reverse fault happens;
• and
• n is a positive integer which is greater than or equal to 1.

A direct current circuit breaker, comprising:

• n in number mechanical switches connected in series;
• one energy-absorbing and voltage-limiting module which is connected in parallel to the n in number mechanical switches;
• one commutation branch circuit which is connected in parallel to the n in number mechanical switches;
• one forward trigger module;
• and
• one reverse trigger module;
• wherein
• the one commutation branch circuit comprises a forward charging commutation module, a commutation capacitor, and a reverse charging commutation module which are connected in series in that order;
• the forward charging commutation module is configured to produce a reverse current in the commutation branch circuit through the coupling reactor to realize the zero-crossing turn-off of the mechanical switch after a forward fault happens;
• the reverse charging commutation module is configured to produce a reverse current in the commutation branch circuit through the coupling reactor to realize the zero-crossing turn-off of the mechanical switch after a reverse fault happens;
• the one energy-absorbing and voltage-limiting module is configured to absorb energy stored in inductive elements of power systems after a fault current is cut off, so as to limit voltage and protect the mechanical switch;
• the forward trigger module is connected in parallel to forward charging commutation modules of the n in number circuit breaker modules and is configured to turn on the forward charging commutation modules when a forward fault happens;
• the reverse trigger module is connected in parallel to reverse charging commutation modules of the n in number circuit breaker modules and is configured to turn on the reverse charging commutation modules when a reverse fault happens;
• and
• n is a positive integer which is greater than or equal to 1.

A direct current circuit breaker, comprising:

• n in number circuit breaker modules connected in series;
• n in number energy-absorbing and voltage-limiting modules which are connected to the n in number circuit breaker modules in parallel, respectively;
• one forward trigger module;
• and
• one reverse trigger module;
• wherein
• each circuit breaker module comprises a mechanical switch and a commutation branch circuit which is connected to the mechanical switch in parallel;
• the commutation branch circuit comprises a forward charging commutation module, a commutation capacitor, and a reverse charging commutation module which are connected in series in that order;
• the forward charging commutation module is configured to produce a reverse current in the commutation branch circuit through the coupling reactor to realize the zero-crossing turn-off of the mechanical switch after a forward fault happens;
• the reverse charging commutation module is configured to produce a reverse current in the commutation branch circuit through the coupling reactor to realize the zero-crossing turn-off of the mechanical switch after a reverse fault happens;
• the one energy-absorbing and voltage-limiting module is configured to absorb energy stored in inductive elements of power systems after a fault current is cut off, so as to limit voltage and protect the mechanical switch;
• the forward trigger module is connected to forward charging commutation modules of the n in number circuit breaker modules in parallel and is configured to turn on the forward charging commutation modules when a forward fault happens;
• the reverse trigger module is connected to reverse charging commutation modules of the n in number circuit breaker modules in parallel and is configured to turn on the reverse charging commutation modules when a reverse fault happens;
• and
• n is a positive integer which is greater than or equal to 1.

A direct current circuit breaker, comprising:

• n in number mechanical switches connected in series;
• n in number energy-absorbing and voltage-limiting modules which are connected in parallel to the n in number mechanical switches, respectively;
• one commutation branch circuit which is connected in parallel to the n in number mechanical switches;
• one forward trigger module;
• and
• one reverse trigger module;
• wherein
• the one commutation branch circuit comprises a forward charging commutation module, a commutation capacitor, and a reverse charging commutation module which are connected in series in that order;
• the forward charging commutation module is configured to produce a reverse current in the commutation branch circuit through the coupling reactor to realize the zero-crossing turn-off of the mechanical switch after a forward fault happens;
• the reverse charging commutation module is configured to produce a reverse current in the commutation branch circuit through the coupling reactor to realize the zero-crossing turn-off of the mechanical switch after a reverse fault happens;
• the one energy-absorbing and voltage-limiting module is configured to absorb energy stored in inductive elements of power systems after a fault current is cut off, so as to limit voltage and protect the mechanical switch;
• the forward trigger module is connected to forward charging commutation modules of the n in number circuit breaker modules in parallel and is configured to turn on the forward charging commutation modules when a forward fault happens;
• the reverse trigger module is connected to reverse charging commutation modules of the n in number circuit breaker modules in parallel and is configured to turn on the reverse charging commutation modules when a reverse fault happens;
• and
• n is a positive integer which is greater than or equal to 1.

A direct current circuit breaker, comprising:

• n in number circuit breaker modules connected in series;
• one energy-absorbing and voltage-limiting module which is connected in parallel to the n in number circuit breaker modules;
• one forward trigger module;
• and
• one reverse trigger module;
• wherein
• each circuit breaker module comprises a mechanical switch and a commutation branch circuit which is connected in parallel to the mechanical switch;
• the commutation branch circuit comprises a forward charging commutation module and a commutation capacitor which are connected in series, and a reverse charging commutation module which is connected in parallel to the forward charging commutation module;
• the forward charging commutation module is configured to produce a reverse current in the commutation branch circuit through the coupling reactor to realize the zero-crossing turn-off of the mechanical switch after a forward fault happens;
• the reverse charging commutation module is configured to produce a reverse current in the commutation branch circuit through the coupling reactor to realize the zero-crossing turn-off of the mechanical switch after a reverse fault happens;
• the one energy-absorbing and voltage-limiting module is configured to absorb energy stored in inductive elements of power systems after a fault current is cut off, so as to limit voltage and protect the mechanical switch;
• the forward trigger module is configured to turn on the forward charging commutation module when a forward fault happens;
• the reverse trigger module is configured to turn on the reverse charging commutation module when a reverse fault happens;
• and
• n is a positive integer which is greater than or equal to 1.

A direct current circuit breaker, comprising:

• n in number mechanical switches connected in series;
• one energy-absorbing and voltage-limiting module which is connected in parallel to the n in number mechanical switches;
• one commutation branch circuit which is connected in parallel to the n in number mechanical switches;
• one forward trigger module;
• and
• one reverse trigger module;
• wherein
• the one commutation branch circuit comprises a forward charging commutation module and a commutation capacitor which are connected in series, and a reverse charging commutation module which is connected in parallel to the forward charging commutation module;
• the forward charging commutation module is configured to produce a reverse current in the commutation branch circuit through the coupling reactor to realize the zero-crossing turn-off of the mechanical switch after a forward fault happens;
• the reverse charging commutation module is configured to produce a reverse current in the commutation branch circuit through the coupling reactor to realize the zero-crossing turn-off of the mechanical switch after a reverse fault happens;
• the one energy-absorbing and voltage-limiting module is configured to absorb energy stored in inductive elements of power systems after a fault current is cut off, so as to limit voltage and protect the mechanical switch;
• the forward trigger module is configured to turn on the forward charging commutation module when a forward fault happens;
• the reverse trigger module is configured to turn on the reverse charging commutation module when a reverse fault happens;
• and
• n is a positive integer which is greater than or equal to 1.

A direct current circuit breaker, comprising:

• n in number circuit breaker modules connected in series;
• n in number energy-absorbing and voltage-limiting modules which are connected in parallel to the n in number circuit breaker modules, respectively;
• one forward trigger module;
• and
• one reverse trigger module;
• wherein
• each circuit breaker module comprises a mechanical switch and a commutation branch circuit which is connected in parallel to the mechanical switch;
• the commutation branch circuit comprises a forward charging commutation module and a commutation capacitor which are connected in series, and a reverse charging commutation module which is connected in parallel to the forward charging commutation module;
• the forward charging commutation module is configured to produce a reverse current in the commutation branch circuit through the coupling reactor to realize the zero-crossing turn-off of the mechanical switch after a forward fault happens;
• the reverse charging commutation module is configured to produce a reverse current in the commutation branch circuit through the coupling reactor to realize the zero-crossing turn-off of the mechanical switch after a reverse fault happens;
• the n in number energy-absorbing and voltage-limiting modules are configured to absorb energy stored in inductive elements of power systems after a fault current is cut off, so as to limit voltage and protect the mechanical switch;
• the forward trigger module is configured to turn on the forward charging commutation module when a forward fault happens;
• the reverse trigger module is configured to turn on the reverse charging commutation module when a reverse fault happens;
• and
• n is a positive integer which is greater than or equal to 1.

A direct current circuit breaker, comprising:

• n in number mechanical switches connected in series;
• n in number energy-absorbing and voltage-limiting modules which are connected to the n in number mechanical switches in parallel, respectively;
• one commutation branch circuit which is connected in parallel to the n in number mechanical switches;
• one forward trigger module;
• and
• one reverse trigger module;
• wherein
• the commutation branch circuit comprises a forward charging commutation module a commutation capacitor which are connected in series, and a reverse charging commutation module which are connected in parallel to the forward charging commutation module;
• the forward charging commutation module is configured to produce a reverse current in the commutation branch circuit through the coupling reactor to realize the zero-crossing turn-off of the mechanical switch after a forward fault happens;
• the reverse charging commutation module is configured to produce a reverse current in the commutation branch circuit through the coupling reactor to realize the zero-crossing turn-off of the mechanical switch after a reverse fault happens;
• the n in number energy-absorbing and voltage-limiting modules are configured to absorb energy stored in inductive elements of power systems after a fault current is cut off, so as to limit voltage and protect the mechanical switch;
• the forward trigger module is configured to turn on the forward charging commutation module when a forward fault happens;
• the reverse trigger module is configured to turn on the reverse charging commutation module when a reverse fault happens;
• and
• n is a positive integer which is greater than or equal to 1.