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    3. Q6: What kind of requirements do smart energy meter have to load switch?
      02.08 2016

      A6: The load switch of smart energy meter can be divided into internal or external mode. When it adopts the internal load switch, the maximum current of energy meter should not be more than 60A.


          When it adopts the internal load switch, switch operation shall have Acr suppression measures (hardware or software), and its export loop shall have safety measures for anti false action and being easy to field test. Under the condition of above current, the lifetime of switch shall not be less than 6000 times. Imposing reference voltage on voltage circuit of energy meter, and under the condition of passing 1.2Imax to current circuit, carries out switch on and off test for 10 times; After the test, the energy meter shall work normally; when imposing 70% to 120% reference voltage on voltage circuit of energy meter, the load switch shall work normally.


          When it adopts external load switch, energy meter shall output a set of switch signals, and the capacity of switch node is AC 250V, 2A. During normal operation, the outgoing switch signals shall maintain load switch closing and allow users to use electricity. When the control conditions are satisfied, the outgoing switch signals shall drive external load switch action and interrupt power supply.

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