CN201656499U - Pre-excitation energy-saving system - Google Patents

Abstract

The utility model relates to a pre-excitation energy-saving system. The pre-excitation energy-saving system comprises a main transformer and a teaser transformer which are connected between the power supply electrical network and main transformer load, so constructed that the capacity of teaser transformer is far less than that of the main transformer, the main transformer and the teaser transformer being in parallel connection, a first circuit breaker being serially connected between the primary side of the main transformer and the power supply electrical network, a second circuit breaker being serially connected between the primary side of the teaser transformer and the power supply electrical network, a third circuit breaker being serially connected between the auxiliary sides of the main and teaser transformers. The system can effectively protect the main transformer from damage in case of no load switching, which prolongs service life of main transformer, decreases damage and loss, and increases operation economy of the whole machine.

Description

The pre-excitation energy conserving system

Technical field

The utility model relates to a kind of pre-excitation energy conserving system, belongs to technical field of electricity.

Background technology

Usually the service entrance switch (circuit breaker) of transformer is in closing position always, even on-load not, no-load loss is also arranged on the transformer always, this part no-load loss all is used for producing the copper loss and the iron loss of transformer inside, this part energy consumption has not only reduced the power factor of complete machine, increased the complete machine operation cost, and no-load running for a long time, the useful life that also can reduce transformer.In order to reduce the loss of transformer self, generally can when transformer is in zero load, itself and power generating facilities and power grids be separated the useful life of prolongation transformer, saying the connection of transformer and power generating facilities and power grids when waiting to need to connect load.But, may produce very big transient state in Transformer Close moment shoves, its aperiodic component can reach more than 10 times amount electric current, this electric current can make the winding in the voltage device be subjected to very big mechanical stress, cause winding deformation and insulation damages, so the transformer number of times of operating a switch, close a floodgate too much can influence useful life equally when Light Condition.

The utility model content

The purpose of this utility model provides and a kind ofly very big transient state can not occur shove the pre-excitation energy conserving system of effectively protecting main transformer to be without prejudice when the main transformer idle-loaded switching-on.

For achieving the above object, the utility model adopts following technical scheme: a kind of pre-excitation energy conserving system, comprise the main transformer that is connected between power generating facilities and power grids and the main transformer load, the secondary of main transformer is connected with teaser transformer, the secondary of teaser transformer is connected with the secondary of main transformer, the capacity of described teaser transformer is much smaller than the capacity of main transformer, be in series with first circuit breaker between the former limit of described main transformer and the power generating facilities and power grids, also be in series with the 3rd circuit breaker between the secondary of described major and minor transformer.

Described main transformer and teaser transformer are arranged in parallel, and the former limit of described teaser transformer is connected with power generating facilities and power grids, and are in series with second circuit breaker between the former limit of teaser transformer and power generating facilities and power grids.

Pre-excitation energy conserving system of the present utility model in use, main transformer is in Light Condition, be to be in off state between main transformer load and the main transformer, with second and third breaker closing, teaser transformer has been linked in the circuit, at this moment, teaser transformer carries out excitation to the secondary of main transformer, simultaneously, former limit at main transformer induces high pressure, and after several seconds (the concrete time decides on the capacity that becomes main depressor), first circuit breaker that closes a floodgate is again thrown the former limit of transformer, after treating that main transformer is stable, cut off second and third circuit breaker more successively.After adopting said system, when main transformer closed a floodgate, it to be inducing voltage respectively, so when throwing the former limit of main transformer, can not occur bigger transient state in the main transformer and shove, and had effectively protected main transformer, had prolonged the useful life of main transformer.After adopting said system, even carrying out frequent switching, main transformer can not cause damage to main transformer yet, therefore when zero load, can cut off main transformer, eliminated the loss when main transformer is unloaded, saved the energy, can not reduce simultaneously the power factor of complete machine again, reduce the complete machine operation cost.

Description of drawings

Fig. 1 is the principle schematic of the utility model pre-excitation energy conserving system.

Embodiment

Shown in Figure 1, in the utility model, be connected with main transformer 2 and teaser transformer 7 by lead between power generating facilities and power grids 1 and the main transformer load 8, wherein the capacity of teaser transformer 7 is much smaller than the capacity of main transformer 2 (capacity of main transformer is not less than ten times of teaser transformer capacity generally speaking), wherein, described main transformer 2 is arranged in parallel with teaser transformer 7, between the former limit 3 of main transformer 2 and power generating facilities and power grids 1, be in series with the first circuit breaker Q F1, between the former limit 5 of teaser transformer 7 and power generating facilities and power grids 2, be in series with the second circuit breaker Q F2, leading, the secondary 4 of teaser transformer, be in series with the 3rd circuit breaker Q F3 between 6.Between the secondary 4 of main transformer load 8 and main transformer, be in series with main transformer short-circuiting device QF.

This pre-excitation energy conserving system in use, main transformer is in Light Condition, be to be in off state between main transformer load and the main transformer, with second and third breaker closing, teaser transformer has been linked in the circuit, at this moment, teaser transformer carries out excitation to the secondary of main transformer, simultaneously, former limit at main transformer induces high pressure, and after several seconds (the concrete time decides on the capacity that becomes main depressor), first circuit breaker that closes a floodgate is again thrown the former limit of transformer, after treating that main transformer is stable, cut off second and third circuit breaker more successively.

Claims (2)

1. pre-excitation energy conserving system, it is characterized in that: comprise the main transformer that is connected between power generating facilities and power grids and the main transformer load, the secondary of main transformer is connected with teaser transformer, the secondary of teaser transformer is connected with the secondary of main transformer, the capacity of described teaser transformer is much smaller than the capacity of main transformer, be in series with first circuit breaker between the former limit of described main transformer and the power generating facilities and power grids, also be in series with the 3rd circuit breaker between the secondary of described major and minor transformer.

2. pre-excitation energy conserving system according to claim 1, it is characterized in that: described main transformer and teaser transformer are arranged in parallel, the former limit of described teaser transformer is connected with power generating facilities and power grids, and is in series with second circuit breaker between the former limit of teaser transformer and power generating facilities and power grids.

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