CN204131092U - The connection circuit of current transformer in the backup protection of a kind of main transformer height - Google Patents
The connection circuit of current transformer in the backup protection of a kind of main transformer height Download PDFInfo
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- CN204131092U CN204131092U CN201420420029.0U CN201420420029U CN204131092U CN 204131092 U CN204131092 U CN 204131092U CN 201420420029 U CN201420420029 U CN 201420420029U CN 204131092 U CN204131092 U CN 204131092U
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Abstract
The utility model provides the connection circuit of current transformer in the backup protection of a kind of main transformer height, comprise some inlet wire current instrument transformers and some internal bridge current transformers, the input that the output of each inlet wire current instrument transformer is corresponding in transform er differential protection with it is respectively connected; The input that the output of each internal bridge current transformer is corresponding in transform er differential protection with it is respectively connected; The output parallel connection that the output that described inlet wire current instrument transformer is corresponding in transform er differential protection is corresponding in transform er differential protection with described internal bridge current transformer accesses its input corresponding in the backup protection of main transformer height afterwards.Therefore inlet wire current instrument transformer produce electric current and internal bridge current transformer produce electric current be main transformer height backup protection input current with electric current, increase the protection range of main transformer height backup protection, enhance the fail safe of electric power system.
Description
Technical field
The utility model relates to a kind of connection circuit of current transformer.Relate in particular to the connection circuit of current transformer in the backup protection of a kind of main transformer height.
Background technology
Transform er differential protection is the main salvo of transformer; general principle is the vector that inflow current respectively held by the protected transformer of reaction; when breaking down in the protection range of transform er differential protection; protective device failure judgement electric current is greater than setting value; transform er differential protection instantaneous operation, tripping relative breaker.At present; a kind of connection type that internal bridge formula is generally adopted by domestic electrical system; main transformer height backup protection under this connection type is the important supplement of transform er differential protection, plays the effect of the whole transformer of protection and line related and electric equipment when transform er differential protection is stopped transport or overhaul.
At present; the electric current that main employing main transformer high voltage side current instrument transformer second siding ring produces is as the input current of main transformer height backup protection; when breaking down within the scope of main transformer high voltage side current instrument transformer sensing main transformer side; the backup protection of main transformer height can when transform er differential protection tripping tripping relative breaker, thus ensure power network safety operation.But the input current of transform er differential protection be inlet wire current instrument transformer produce electric current and internal bridge current transformer produce electric current and electric current; and the input current of main transformer height backup protection is only the electric current that main transformer high voltage side current instrument transformer produces; therefore; the protection range of main transformer height backup protection is much smaller than the protection range of transform er differential protection; stop transport or maintenance once transform er differential protection; part grid equipment (i.e. grid equipment outside the protection range of main transformer height backup protection) unprotect will be caused to run, and this will have a strong impact on the fail safe of electric power system.
Utility model content
For this reason; technical problem to be solved in the utility model is the protection range of protection range much smaller than transform er differential protection of main transformer height backup protection in prior art; stop transport or maintenance once transform er differential protection; part grid equipment unprotect will be caused to run; have impact on the fail safe of electric power system, thus the connection circuit of current transformer in a kind of main transformer height backup protection that the protection range of main transformer height backup protection can be made identical with the protection range of transform er differential protection is provided.
For solving the problems of the technologies described above, the technical solution of the utility model is as follows:
The utility model provides the connection circuit of current transformer in the backup protection of a kind of main transformer height, comprising: some inlet wire current instrument transformers and some internal bridge current transformers;
Described some inlet wire current instrument transformers, the input that the output of each inlet wire current instrument transformer is corresponding in transform er differential protection with it is respectively connected;
Described some internal bridge current transformers, the input that the output of each internal bridge current transformer is corresponding in transform er differential protection with it is respectively connected;
The output parallel connection that the output that described one or more inlet wire current instrument transformer is corresponding in transform er differential protection is corresponding in transform er differential protection with described one or more internal bridge current transformer accesses its input corresponding in the backup protection of main transformer height afterwards.
Technique scheme of the present utility model has the following advantages compared to existing technology:
(1) connection circuit of current transformer in main transformer height described in the utility model backup protection, comprise some inlet wire current instrument transformers and some internal bridge current transformers, the input that the output of each inlet wire current instrument transformer is corresponding in transform er differential protection with it is respectively connected; The input that the output of each internal bridge current transformer is corresponding in transform er differential protection with it is respectively connected; And the output parallel connection that the output that described one or more inlet wire current instrument transformer is corresponding in transform er differential protection is corresponding in transform er differential protection with described one or more internal bridge current transformer accesses its input corresponding in the backup protection of main transformer height afterwards.Because the electric current input main transformer height backup protection only having main transformer high voltage side current instrument transformer to produce in prior art, and the connection circuit of current transformer in main transformer height described in the utility model backup protection, the electric current that the electric current that some inlet wire current instrument transformers can be produced and some internal bridge current transformers produce with the backup protection of electric current input main transformer height, by this design, can by the expanded range of main transformer height backup protection to the grid equipment at main transformer inlet wire side and internal bridge place, make the protection range of main transformer height backup protection consistent with the protection range of transform er differential protection, therefore, even if when transform er differential protection is stopped transport or overhauls, more grid equipment can run in the protection range of main transformer height backup protection, enhance the fail safe of electric power system.
Accompanying drawing explanation
In order to make content of the present utility model be more likely to be clearly understood, below according to specific embodiment of the utility model also by reference to the accompanying drawings, the utility model is described in further detail, wherein
Fig. 1 is the circuit theory diagrams of the connection circuit of current transformer in main transformer height described in the utility model backup protection;
Fig. 2 is the protection range schematic diagram of main transformer height backup protection in prior art;
Fig. 3 is the protection range schematic diagram of main transformer height described in the utility model backup protection.
Embodiment
Embodiment 1
Present embodiments provide the connection circuit of current transformer in the backup protection of a kind of main transformer height, as shown in Figure 1, comprising: some inlet wire current instrument transformers and some internal bridge current transformers.
Described some inlet wire current instrument transformers, the input that the output of each inlet wire current instrument transformer is corresponding in transform er differential protection with it is respectively connected.
Described some internal bridge current transformers, the input that the output of each internal bridge current transformer is corresponding in transform er differential protection with it is respectively connected.
The output parallel connection that the output that described one or more inlet wire current instrument transformer is corresponding in transform er differential protection is corresponding in transform er differential protection with described one or more internal bridge current transformer accesses its input corresponding in the backup protection of main transformer height afterwards.
In embody rule, the current flow configuration that described high voltage side lead-in current transformer and internal bridge current transformer produce flow into the input of main transformer height backup protection as judging electric current with electric current.By this design; the electric current that the electric current that some inlet wire current instrument transformers can be produced and some internal bridge current transformers produce with the backup protection of electric current input main transformer height; make the expanded range of main transformer height backup protection to the grid equipment at main transformer inlet wire side and internal bridge place; make the protection range of main transformer height backup protection consistent with the protection range of transform er differential protection; therefore; even if when transform er differential protection is stopped transport or overhauls; equipment in electrical network also all runs in the protection range of main transformer height backup protection, enhances the fail safe of electric power system.
In embody rule, when this kind of mode of connection is used in intelligent substation, by inlet wire current and bridge electric current are inputted in the merge cells at respective interval respectively, delivered in the standby of main transformer height and differential protection by optical fiber, realize electric current add and.
Fig. 1 is the circuit theory diagrams of a connection circuit concrete case of current transformer in main transformer height backup protection described in the present embodiment, wherein 2LH is the secondary coil of an inlet wire current instrument transformer, 11LH is the secondary coil of an interior bridge current transformer, 1n is transform er differential protection, 1-2n is the backup protection of main transformer height, the input 1ID1 that the output of inlet wire current instrument transformer 2LH is corresponding in transform er differential protection 1n with it is respectively can be clearly seen that by Fig. 1, 1ID2, 1ID3 is connected, the input 1ID8 that the output of internal bridge current transformer 11LH is corresponding in transform er differential protection 1n with it respectively, 1ID9, 1ID10 is connected, the output 1nA2 that inlet wire current instrument transformer 2LH is corresponding in transform er differential protection 1n, 1nA4, the output 1nA8 that 1nA6 is corresponding in transform er differential protection 1n with internal bridge current transformer 11LH, 1nA10, 1nA12 parallel connection accesses its input 1-2ID1 corresponding in main transformer height backup protection 1-2n afterwards, 1-2ID2, 1-2ID3.As adopted other inlet wire current instrument transformer and internal bridge current transformer also with reference to this connected mode.
Fig. 2 is the protection range schematic diagram of transform er differential protection and the backup protection of main transformer height in prior art, because the input current of transform er differential protection be inlet wire current instrument transformer produce electric current and internal bridge current transformer produce electric current and electric current, therefore the protection range of transform er differential protection is the scope that T-shaped frame (frame that Fig. 2 chain lines surrounds) identifies, also be main transformer inlet wire side, the grid equipment of internal bridge place and transformer (high-pressure side and low-pressure side) is all in the protection range of transform er differential protection, and the input current of main transformer height backup protection is only the electric current that main transformer high voltage side current instrument transformer produces in prior art, therefore the protection range of main transformer height backup protection is only the scope that stripe shape frame (frame that in Fig. 2, dotted line surrounds) identifies, compare the protection range of differential protection, it cannot protect the electric equipment on high voltage side lead-in and bridge, therefore much smaller than the protection range of transform er differential protection.Once transform er differential protection is stopped transport and maintenance, the grid equipment unprotect operation at main transformer inlet wire side, internal bridge place will be caused, had a strong impact on the safety of electric power system.
The protection range schematic diagram that Fig. 3 is transform er differential protection described in the present embodiment and the backup protection of main transformer height; because the input current of main transformer height backup protection described in the present embodiment be inlet wire current instrument transformer produce electric current and internal bridge current transformer produce electric current and electric current; therefore, the protection range of main transformer height backup protection identical with the protection range of transform er differential protection (the T-shaped frame that in Fig. 3, dotted line surrounds) in the present embodiment.No matter inlet wire side, internal bridge place or any one grid equipment of transformer side breaks down; such as short circuit, all can cause the increase with electric current, when exceeding setting value; the backup protection of main transformer height will tripping respective circuit breakers, ensures power network safety operation.Therefore, even if when transform er differential protection is stopped transport or overhauls, grid equipment also can safe operation under the protection of main transformer height backup protection.
As the optional execution mode of one; the connection circuit of current transformer in main transformer height backup protection described in this exemplifying embodiment, described inlet wire current instrument transformer secondary coil is respectively used to the double main transformer height standby inlet wire current measurement of transform er differential protection inlet wire current measurement, inlet wire current remote measurement is held concurrently, and metering current is measured and the current measurement of standby current automatic throw-in equipment.
As the optional execution mode of one; the connection circuit of current transformer in main transformer height backup protection described in the present embodiment, described internal bridge Current Transformer Secondary circle is respectively used to the current measurement of transform er differential protection bridge and holds concurrently the backup protection current measurement of main transformer height and bridge telemetering of current.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to execution mode.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all execution modes.And thus the apparent change of extending out or variation be still among the protection range that the utility model creates.
Claims (1)
1. the connection circuit of current transformer in the backup protection of main transformer height, is characterized in that, comprising: some inlet wire current instrument transformers and some internal bridge current transformers;
Described some inlet wire current instrument transformers, the input that the output of each inlet wire current instrument transformer is corresponding in transform er differential protection with it is respectively connected;
Described some internal bridge current transformers, the input that the output of each internal bridge current transformer is corresponding in transform er differential protection with it is respectively connected;
The output parallel connection that the output that described one or more inlet wire current instrument transformer is corresponding in transform er differential protection is corresponding in transform er differential protection with described one or more internal bridge current transformer accesses its input corresponding in the backup protection of main transformer height afterwards.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420420029.0U CN204131092U (en) | 2014-07-28 | 2014-07-28 | The connection circuit of current transformer in the backup protection of a kind of main transformer height |
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| CN201420420029.0U CN204131092U (en) | 2014-07-28 | 2014-07-28 | The connection circuit of current transformer in the backup protection of a kind of main transformer height |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375438A (en) * | 2015-12-16 | 2016-03-02 | 国网山东省电力公司青岛供电公司 | Zero sequence current detection device for neutral point connected to grounding through small resistor and method |
| CN106059068A (en) * | 2016-05-25 | 2016-10-26 | 国网山东省电力公司青岛供电公司 | Architecture of inner bridge connection type intelligent substation process layer |
-
2014
- 2014-07-28 CN CN201420420029.0U patent/CN204131092U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105375438A (en) * | 2015-12-16 | 2016-03-02 | 国网山东省电力公司青岛供电公司 | Zero sequence current detection device for neutral point connected to grounding through small resistor and method |
| CN105375438B (en) * | 2015-12-16 | 2018-01-12 | 国网山东省电力公司青岛供电公司 | Zero sequence current detection device and method for Neutral Point Through Low Resistance system |
| CN106059068A (en) * | 2016-05-25 | 2016-10-26 | 国网山东省电力公司青岛供电公司 | Architecture of inner bridge connection type intelligent substation process layer |
| CN106059068B (en) * | 2016-05-25 | 2019-02-26 | 国网山东省电力公司青岛供电公司 | A kind of framework of internal bridge formula transformer station process layer |
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