简答题Which of the following parameters characterizes the breaking capacity of a circuit breaker ( ). A、Rated current; B、Rated breaking current C、 Limit through current D、 Thermal stable current简答题The main structure of indoor disconnecting switch includes conducting part, supporting insulator, operating insulator and base (). A、正确 B、错误简答题LW6-220 represents what kind of equipment ( ). A、Disconnecting switch B、 Sulfur hexafluoride circuit breaker C、Vacuum circuit breaker D、Low oil circuit breaker简答题The rated voltage in the circuit breaker technical parameters ( ). A、Valid value B、Peak; C、Instantaneous value D、 The maximum简答题In the spring operating mechanism of circuit breaker, the closing spring is stored energy by ( ) in general. A、Motor B、Brake spring C、 Closing spring D、leverage简答题What kind of equipment SW6-110 stands for ( ). A、Disconnecting switch B、Vacuum circuit breaker C、Indoor less oil circuit breaker D、Outdoor less oil circuit breaker简答题Which of the following current parameters of a circuit breaker is represented by peak values.（ ） A、Rated current B、Rated breaking current C、Dynamic stable current D、Thermal stable current简答题The disconnecting switch with grounding switch should be equipped with interlocking mechanism to ensure the operation sequence of disconnecting switch and grounding switch closing. A、正确 B、错误简答题Isolating switches can split and close circuits with only voltage but no load current (). A、正确 B、错误简答题ZN4-10 representative is what kind of equipment.（ ） A、Isolating switch B、Vacuum circuit breaker C、Indoor less oil circuit breaker D、Outdoor less oilcircuit breakers简答题10kV vacuum circuit breaker can generally break short circuit current ( ) times or more without maintenance. A、3 B、50 C、2000 D、30000简答题Is mainly used in the switch cabinet circuit breaker is ( ). A、Vacuum circuit breaker B、Less oil circuit breaker C、 SF6 circuit breaker D、Air circuit breaker简答题The parameters of the circuit breaker which of the following about the current is expressed with valid values.（ ） A、Rated switching current B、Rated breaking current C、Dynamic stable current D、Limiting current简答题The reason for the elimination of oil circuit breakers is ( ). A、It uses a lot of oil and is expensive B、Short maintenance cycle and poor reliability C、Complex structure, high process requirements D、There are frequent explosions简答题The disconnecting switch with earthing switch should be equipped with interlocking mechanism to ensure the operation sequence of disconnecting earthing switch and closing isolating switch (). A、正确 B、错误简答题"Frequent oil pump on" fault is said by ( ). A、Spring grass moving mechanism B、 Hydraulic operating mechanism C、Pneumatic operating mechanism D、Vacuum circuit breaker arc extinguishing chamber简答题Check the insulation of circuit breaker in the state of opening, generally do ( ). A、Dc resistance measurement test B、Mechanical properties test C、 Pressure test D、 Operating life test简答题At present, 220kV and above circuit breakers use which operating mechanism (). A、Manual operating mechanism B、Electromagnetic operating mechanism C、 Spring operating mechanism D、Hydraulic operating mechanism简答题There are several forms of disconnecting switch, such as whether there is a grounding switch or not and the number of grounding switches installed A、No grounding B、 Single ground C、Double ground D、Three ground简答题Disconnecting switch according to the different operating mechanism, can be divided into () and other types. A、Manual B、Electric C、Automatically D、semi-automatic