photovoltaic power plants convert solar radiation energy( ) into electrical energy.
electrical equipment that directly produces, converts, and distributes electrical energy is called ( ).
in the power system, （ ）can play the role of peak and valley load shifting.
when the whole（ ） is cut off, the power system will be disconnected or even paralyzed.
which of the following devices are not secondary devices ( ).
which of the following is not a function of the primary device ( ).
thermal power plant energy chain: chemical energy--( )--mechanical energy--electrical energy.
hydroelectric power plant energy chain: ( )--mechanical energy -- electrical energy.
there are three main equipment in a hydroelectric power plant, pressure pipe, ( ) and generator.
nuclear power plant energy chain: ( ) -- thermal energy -- mechanical energy -electrical energy
wind power plant energy chain: ( ) -- mechanical energy--electrical energy
photovoltaic power plant energy chain: ( ) -- electrical energy
( ) is an electrical device used to close or break the normal working current, overload current or short-circuit current of a circuit and has an arc extinguishing device.
near-cathode effect: when the arc current naturally crosses zero, the initial dielectric strength of ( ) immediately appears in the arc gap within a very short period of time (about 0.1-1.0s).
basic conditions for extinguishing the arc:( )
which of the following is not a characteristic of ac arc ( )
in the contact gap of circuit breaker, the electric arc combustion is maintained by ( ).
which of the following is not the role of high-voltage circuit breaker ? ( )
the maximum operating voltage for equipment with rated voltage of 330kv and 500kv is ( ) times of rated voltage.
( ) of the circuit breaker is the time interval from the moment the circuit breaker receives the switching order to the moment when all phase arcs of the circuit breaker are finally extinguished.
type zn4-10/600 circuit breakers can be used in circuits with a maximum continuous operating current of ( ).
lw6-500 is an outdoor 500kv high voltage ( ).
rated breaking current is the ( ) that the circuit breaker can be safely broken at rated voltage.
one of the uses of the high voltage isolator is ( ).
the isolating switch model is gn2-10/1000, meaning ( ).
gw7-35 series high-voltage isolator are of ( ) structure.
gn2-35/1000 with grounding switch is indicated by letter ( ) in its model.
gn2-35/1000 with grounding switch is indicated by letter ( ) in its model.
gw7-35 series high-voltage isolator are of ( ) structure.
the isolating switch model is gn2-10/1000, meaning ( ).
one of the uses of the high voltage isolator is ( ).
rated breaking current is the maximum ( ) that the circuit breaker can be safely broken at rated voltage.
lw6-500 is an outdoor 500kv high voltage ( ).
type zn4-10/600 circuit breakers can be used in circuits with a maximum continuous operating current of ( ).
( ) of the circuit breaker is the time interval from the moment the circuit breaker receives the switching order to the moment when all phase arcs of the circuit breaker are finally extinguished.
the maximum operating voltage for equipment with rated voltage of 330kv and 500kv is ( ) times of rated voltage.
which of the following is not the role of high-voltage circuit breaker ? ( )
in the contact gap of circuit breaker, the electric arc combustion is maintained by ( ).
which of the following is not a characteristic of ac arc ( )
basic conditions for extinguishing the arc:( )
near-cathode effect: when the arc current naturally crosses zero, the initial dielectric strength of ( ) immediately appears in the arc gap within a very short period of time (about 0.1-1.0s).
( ) is an electrical device used to close or break the normal working current, overload current or short-circuit current of a circuit and has an arc extinguishing device.
one of the function of transformer is ( ).
the correct symbol of the current transformer is ( ).
the correct symbol of the voltage transformer is ( ).
the transformer composed of capacitive voltage ider and battery unit is ( ).
the primary winding of ( ) is in series in a primary system (circuit).
the primary winding of ( ) is parallel to the primary system (circuit).
the accuracy level of ( ) current transformer is 0.1, 0.2, 0.5......and so on.
open circuit is not allowed in the secondary circuit of the electromagnetic current transformer in operation, or it will be generated ( ) in the secondary circuit.
one of the commonly used wiring forms of electromagnetic current transformers is ( ).
the secondary circuit of the electromagnetic voltage transformer in operation is not allowed to ( ) operate.
one of the factors affecting the error of electromagnetic voltage transformer is ( ).
which of the following is not a standard for measuring the reliability of electrical main wiring ( )?
the operation sequence of the line power outage is ( ).
the operation sequence of the line power recover is ( ).
belonging to the wiring with bus line is ( ).
the connection of the outer bridge is suitable for ( ).
the connection of the inner bridge is suitable for ( ).
the function of a bypass circuit breaker is ( ).
the wiring of one and a half circuit breakers belongs to ( ).