High - voltage cubicles , current transformers , cable heads , hour meters , switches , transformers , circuit beakers , etc 高压制柜、电流变压器、电缆前端、时间电表、电闸、变压器及断路器等
Railway applications - fixed installations - particular requirements for a . c . switchgear - measurement , control and protection devices for specific use in a . c . traction systems - single - phase current transformers - single - phase current transformers 铁路设施.固定装置.交流电开关的专门要求.交流牵引系统特殊使用的测量控制和保护装置.单相电流变压器
At power frequencies ( 45 hz to 60 hz ) , the measuring range can be extended to 100 a . however , the calibrator under test must be capable of driving inductive loads as precision current transformers will be used for the measurements in this extended range 有关的测量量程在市电频率( 45hz至60hz )可扩大至100a 。但由于在此扩大量程的测量需使用精密电流变压器，故此接受测试的校正器必须有驱动电感负载的能力。
