110kV/10kV and 110kV/35kV two pre-installed integrated intelligent substations

Abstract

The invention provides 110kV / 10kV and 110kV / 35kV two pre-installed integrated intelligent substations. Transformers are 110kV / 10kV and 110kV / 35kV two three-phase power transformers and are of a five-stem core structure; three phases of 110kV high-voltage windings of the transformers are in YN connection; each phase of 10kV and 35kV low-voltage windings and 10kV and 35kV fuses are connected in series to form a low-voltage phase arm; and three phases of low-voltage phase arms form d connection, and the connection group is labeled as YN, d11, and has a ''three-phase noninterference'' function. Various accessories in the substations are installed in a high-strength steel structure box body in an integrated manner, so that the characteristic of high ''integration'' is highlighted. By the substations, modern high-new technologies of a digital technology, an automatic control technology, an information collection and transmission technology and the like are combined, so that the characteristic of high ''intelligentization'' is highlighted. Production assembly and debugging of various components in the substations are completed once in a factory, so that the characteristic of high ''pre-installation'' is highlighted; the size and the floor area of the 110kV / 10kV and 110kV / 35kV two pre-installed integrated intelligent substations are greatly reduced; and the power supply safety and reliability are ensured.

Description

technical field [0001] The invention belongs to the field of electric equipment, and specifically relates to two prefabricated integrated intelligent substations of 110kV / 10kV and 110kV / 35kV. Background technique [0002] my country's traditional 110kV / 10kV and 110kV / 35kV substations are traditional substation construction models that install scattered related power equipment in civil construction power distribution houses that meet the corresponding national standards, and put them into operation after successful on-site commissioning. This mode of station construction has many problems such as large land occupation, high building structure, long construction period, large project investment, complex high and low voltage lines, exposed live parts, and complicated installation and commissioning work. The 110kV and 35kV power grids in my country's power system (when the capacity is above 6300kVA (including 6300kVA)) use the neutral point direct grounding method, while the 35k...

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Problems solved by technology

This mode of station construction has many problems such as large land occupation, high building structure, long construction period, large project investment, complex high and low voltage lines, exposed live parts, complicated installation and commissioning work, etc.

The 110kV and 35kV power grids in my country's power system (when the capacity is above 6300kVA (including 6300kVA)) use the neutral point direct grounding method, while the 35kV (when the capacity is below 6300kVA) and 10kV power grids adopt the neutral point indirect grounding method. The grounding method, and the traditional 110 kV / 10kV and 110kV / 35kV two power transformers and the 10kV / 0.4kV and 35kV / 0.4kV two station (grounding) distribution transformers adopt a three-phase three-column iron core structure, Therefore, once the line fails, no matter before or after the faulty phase fuse completes the phase failure protection, it will affect the power supply voltage of the non-faulty phase, making its voltage value exceed the deviation range allowed by the power supply standard. This voltage exceeds the standard For the single-phase modern electronic loads with computers and modern household and office appliances as the main body, they will suffer potential damage or shorten the service life. This is an obvious defect of my country's existing traditional power supply technology.

In addition, in the traditional technology, the distance between the 110kV / 10kV and 110kV / 35kV substations and the 35kV / 10 kV, 10kV / 0.4 kV and 35kV / 0.4kV user substations is generally far away, resulting in line loss and investment The waste is very prominent, which is also the obvious shortcoming of the existing traditional power supply technology

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