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Photovoltaic inverter power supply control circuit breaker tripping! The reason is thoughtless to control current

by:Fangpusun     2020-05-29
In this paper, we introduce the central head office security photovoltaic electric security association project, according to their experience in pv power system fault examples and the countermeasures, Suggestions are put forward on the licensed electrician. Text is the project summary of failure cases focus group members contribute. Photovoltaic inverter ( 个人电脑) 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 ( MCCB2P10A) 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 ( MCB2P10A) 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 ( MCB2P20A) Through machine load on board in the circuit breaker tripping, branch to each PCS of dedicated circuit breaker ( MCB2P6A) 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 ( MCCB2P10A) Special circuit breaker tripping of each PCS were not tripping, and measuring the current of each PCS began to run. It was found that PCS in operation control current is 6. 第8A条。 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 after a change, implement the interconnection test again, 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.
Wenzhou Xihe Electric Co.,LTD.'s products comply fully with all compatible producing regulations.
is a charge controller manufacturers custom inverter provided by Wenzhou Xihe Electric Co.,LTD. which is a leading manufacturer in China. For more information, visit Fangpusun Charge Controller.
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