pt gmt32 (b) special measurement circuit of small circuit breakers-ag凯发k8国际

uses and featuresimprove the energy metering accuracyreduce the comprehensive error of electric energy metering devicehas been the important goals of electricity management departmentsowing to the comprehensive error of electric energy metering device is currentthe voltage transformer composite errorwatt-hour meter and voltage circuit voltage drop caused by the errorsalthough the current with high precisionthe voltage transformer and electricity metermake the electric energy metering accuracy is greatly improvedbut more problems due to the measurement circuitthus the accuracy of electric energy metering device also cannot achieve a satisfactory effect
voltage circuit including secondary cable pressure drop of the voltage dropexport voltage transformer circuit breakersor fusethe pressure drop and relaythe pressure drop of terminal blocks, etcin order to reduce the pressure drop of the voltage loopat present has taken many effective measuressuch as increase the cable conductor cross sectionshorten the length of cableif use electricity meter to devolve billingdecorate in the configuration area),billing use special transformerreduce the voltage loop of the intermediate links, and so on are the voltage circuit had a significantly lower voltage dropbut export voltage transformer circuit breakeror fusethe pressure drop of the problem is still not solved completelythus to some extent, has become a limiting thetime "element measurement precision is improved
because at present, for some ⅰ、 ⅱ kind of electricity loadrequired voltage loop un secondary voltage drop of 0.5 ~ 0.25%which includes cableswitch electrical appliances and terminals, such as total pressure drop allows only 0.5 v ~ 0.25 vexcluding certain pressure drop cable and terminalthe pressure drop for switching element itself has been minimaland now is widely used in electric power system voltage transformer secondary circuit breaker or fuseits pressure drop are largerunder normal circumstancesordinary breaker or fusethe rated current 1 a 0.67 ω internal impedancecurrent is 3 a 0.25 ω internal impedancecurrent is 5 a 0.08 ω internal impedanceso much resistanceits pressure drop exceeds allowed pressure dropso that the power supply division
in additionexport voltage transformer circuit breakersor fusethere are other performance requirementssuch as the instantaneous tripping current should be small enoughtime should be enough to move fastand can well protect circuit switch equipmentcommonly used general circuit breakerthe instantaneous tripping current average for more than 7 iethe action time of more than 150 mscommonly used in 3 ie current fusesthe fuse for more than 50 msgmt32 miniature circuit breaker of the instantaneous tripping current for (2.8 3.5)the action time of 20 ms or less
thusinternal resistance is smallthe instantaneous tripping current small gmt32 miniature circuit breaker to reduce metering device voltage loop pressure dropimprove the measurement accuracy is indispensable
gmt32 series miniature circuit breakershereinafter referred to as a circuit breaker),applied to ac 50 hzbelow the rated current 10 arated voltage 230 v / 400 v of pt in the networkused to allocate electricity and as over-current protection circuit and power supply equipmentalso can be used to frequent on-off operationthe circuit breaker has a small volumehigh breaking capacitynimblelow pressure drop, etctherefore is particularly suitable for circuit breaker requirements small pressure dropshort circuit current action requires small pt line protection and precision instrument protection fast

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