Photovoltaic inverter power supply control circuit breaker tripping the analysis of the reason

Photovoltaic inverter ( PCS) Is the heart of the photovoltaic power generation equipment. If PCS will not operate properly, generating electricity cannot be transported to the grid system. The introduction in the new set up photovoltaic power generation equipment in the interconnection test, PCS control power supply circuit breaker tripping examples. In a power output of 990 kw million watts photovoltaic device interconnection test site, when confirm the PCS before the setup and operation of a variety of switch state after all have no problem, started the interconnection. PCS by the rated power output of 490 kw and 500 kw respectively of the two. PCS in a short time, since we started running machine load on board in the PCS control power supply circuit breaker ( MCCB 2P10A) Stopped suddenly jumped brake, the PSC. 

 In order to find out the reason, we first check the PCS and other devices to see if there is abnormal, but found no problem. So, try to restart the PCS, as a result, PCS control power supply circuit breaker ( MCB 2P10A) Trip again. Through the current is rated current of nearly 1. Four times the PCS control power from high pressure to send the electric equipment dedicated circuit breaker ( MCB 2P20A) Through machine load on board in the circuit breaker tripping, branch to each PCS of dedicated circuit breaker ( MCB 2P6A) Connected to PCS. Dedicated circuit breakers at all PCS with no trip ( FIG.  1) 。 Figure 1: the machine compartments within the PCS control power supply circuit breaker ( MCCB 2P10A) Tripping dedicated circuit breakers at all PCS with no trip ( Reference: central electric security association) Hence, measuring the current of each PCS began to run. It was found that PCS in operation control current is 6. 8A。 Therefore, machine load of current reached its 13 2 times. 6A。 

 The circuit breaker rated current of the compartments of the machine for 10 a. This presumably, due to the flow of electric current is the circuit breaker rated current nearly 1. 4 times, so led to the trip. Then, with the contractor to discuss, remove the machine side of circuit breaker, instead of directly with the PCS dedicated circuit breaker connection. And will be a dedicated circuit breaker rated current of the increased from 6 a to 10 a ( FIG.  2) 。 Figure 2: a direct connection to the dedicated circuit breaker for each of these PCS, eliminates the rated current of the fault will be dedicated circuit breaker from 6 a to 10 a ( Reference: central electric security association) After changes, implement the interconnection test again, the smooth interconnection. The fault is because of the PCS control power in considering how much when we started running through the current inadequate, chose the insufficient capacity of the breaker. Even if, in accordance with the construction design drawings, may appear this kind of failure. Such failure, need to calm grasp the situation at the scene, problem solver. More articles about photovoltaic inverter display: two factors determine the conversion efficiency of photovoltaic inverter
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