Protection Device of Cummins Diesel Generator Set

The stator ground protection of Cummins diesel generator set, as the stator single-phase ground fault protection of Cummins diesel generator set, consists of two parts: the fundamental zero sequence voltage part and the third harmonic voltage part. The protection is composed of longitudinal zero sequence voltage and negative sequence fault direction criterion, and PT disconnection blocking measures are set. The rotor one point grounding protection of Cummins diesel generator set is used to reflect the one point grounding fault of the rotor circuit of Cummins diesel generator set. The protection adopts the ping-pong switching principle, sampling the positive and negative voltage of the rotor return circuit to the ground in turn, and calculating the rotor grounding resistance and grounding position in Real-time computing by solving two different grounding circuit equations.

The protection device consists of a fixed time limit and an inverse time limit, with the fixed time limit acting on the signal after a time limit of 5 seconds. The inverse time action characteristic is determined according to the ability of Cummins diesel generator set to withstand overload current, and acts on disconnection. The protective device can reflect the heat accumulation process of the generator stator. The protection device consists of fixed time limit and inverse time limit. The fixed time limit action current is set to avoid the long-term allowable negative sequence current value of the Cummins diesel generator set and the unbalanced current value of the negative sequence current filter under the maximum load, and acts on the signal after a time limit of 3 seconds.

The inverse time limit action characteristic is determined according to the ability of Cummins diesel generator set to withstand negative sequence current, and acts on de excitation of disconnection. Before the Cummins diesel generator set is connected to the grid, if the generator terminal voltage reaches 1.3 times the rated value, the overvoltage of Cummins diesel generator set will act on de excitation after delaying 0.5 s. When the Cummins diesel generator set is connected to the grid, this protection will automatically exit. Whether the Cummins diesel generator set transformer set is connected to the grid will be judged by the auxiliary contact status of the 220KV side switch of the main transformer.

Since 1982, Starlight Generator has been a generator set manufacturer qualified by the "National Internal Combustion Engine Quality Supervision and Inspection Center". The product quality has passed the IS09001 quality system standard certification. And obtained the qualification certificate for self-operated import and export. Over the years, starlight units have been widely used in all walks of life, and have won the network access qualification of the Ministry of Information Industry, the network access qualification of the Ministry of Radio and Television, the network access qualification of CNPC, the network access qualification of China Mobile, and the manufacturing qualification of marine units. In 2016, Starlight was awarded the Certificate of Qualified Supplier of China Nuclear Power Group. Starlight Generator has been cooperating with Shangchai Power for many years. In 2009, it became the OEM partner of Shangchai Power in China. Starlight generator VOLVO unit ranks the top three in the Asia-Pacific sales volume, and is the core OEM partner of Sweden Volvo in the Asia-Pacific region. If any question please feel free to visit our website https://www.dieselgeneratortech.com/ or send email to sales@dieselgeneratortech.com.