CN214041463U - Generator transformer set system - Google Patents
Generator transformer set system Download PDFInfo
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- CN214041463U CN214041463U CN202022550304.9U CN202022550304U CN214041463U CN 214041463 U CN214041463 U CN 214041463U CN 202022550304 U CN202022550304 U CN 202022550304U CN 214041463 U CN214041463 U CN 214041463U
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Abstract
The utility model provides a generator transformer set system, include: the power generator, the main transformer and the outlet voltage transformer; the generator is connected with the high-voltage bus through a main transformer, and the outlet voltage transformer is connected with the output end of the generator; the generator is connected with the first end of the generator neutral point disconnecting link through a neutral point connecting line, and the second end of the generator neutral point disconnecting link is grounded through a grounding transformer; and the neutral point of the outlet voltage transformer is connected with the second end of the generator neutral point disconnecting link. This embodiment can reduce dismouting flexible coupling lead wire procedure, and protective apparatus reduces maintenance, operating personnel's work load, avoids the maloperation and electrocutes danger.
Description
Technical Field
The utility model relates to a send out and become insulating test technical field of group, particularly, relate to a generator transformer group system.
Background
In the existing wiring and protection configuration of a generator set, a Voltage Transformer (VT) at an outlet of the generator is mostly used as a measuring device for protecting turn-to-turn short circuit of a stator winding of the generator, a neutral point of the Voltage Transformer at the outlet of the generator is connected with a neutral point of the generator through a cable, and a cable connection point is arranged on a generator side of a neutral point grounding disconnecting link of the generator and is grounded through a neutral point grounding disconnecting link of the generator and a neutral point grounding Transformer.
When the generator transformer bank is subjected to insulation test, the generator transformer bank needs to be powered off, each VT pulls out intervals and pulls open the grounding knife switch of the neutral point of the generator, and the soft connecting lead from the neutral point of the generator to the grounding transformer of the neutral point is disassembled, and when the wire is disassembled, a maintainer needs to be informed and transact a work order, install a grounding wire and close the grounding knife switch to take safety measures. Because the capacitance current of the connecting cable from the VT neutral point to the generator neutral point is large, the capacity of the megohmmeter is small, the starting variable insulation value cannot be measured, and the starting variable insulation value can be measured only by throwing away the connecting cable from the VT neutral point to the generator neutral point.
The generator transformer bank has the advantages of complex procedure, high labor intensity, easy misoperation and electric shock danger when the insulation measurement of the generator transformer bank is carried out.
SUMMERY OF THE UTILITY MODEL
The utility model provides a current generator transformer group, the procedure that needs when sending out the insulation measurement of transformer group is loaded down with trivial details, intensity of labour is high, easily takes place maloperation and the dangerous problem of electric shock.
In order to solve the above problem, the embodiment of the present invention is implemented as follows:
an embodiment of the utility model provides a generator transformer set system, include: the power generator, the main transformer and the outlet voltage transformer; the generator is connected with a high-voltage bus through the main transformer, and the outlet voltage transformer is connected with the output end of the generator; the generator is connected with a first end of a generator neutral point disconnecting link through a neutral point connecting wire, and a second end of the generator neutral point disconnecting link is grounded through a grounding transformer; the outlet voltage transformer neutral is connected to the second end of the generator neutral disconnecting link.
Optionally, a neutral point current transformer is further included; the neutral point current transformer is connected between the generator and the generator neutral point disconnecting link.
Optionally, the outlet voltage transformer comprises an inter-turn protection voltage transformer, a neutral point of the inter-turn protection voltage transformer being connected to the second end of the generator neutral point disconnecting link.
Optionally, the outlet voltage transformer further includes a measurement voltage transformer and an excitation regulation voltage transformer.
Optionally, the main transformer is grounded through a main transformer neutral point disconnecting link and a current transformer which are connected in parallel.
Optionally, an excitation transformer is further connected to the output end of the generator.
Optionally, the generator neutral point disconnecting link is provided with a locking device.
Optionally, the outlet voltage transformer is a trolley or drawer voltage transformer.
Optionally, the power generation system further comprises a high-voltage service transformer, wherein the high-voltage service transformer is connected with the output end of the power generator.
Optionally, a current transformer is arranged between the high-voltage station transformer and the output end of the generator.
The generator transformer set system that this embodiment provided improves the hookup location of export voltage transformer neutral point and generator neutral point, connects in the ground connection one side of ground connection switch, need not to dismantle the soft connection lead wire of generator neutral point switch to generator when carrying out insulation test to reduce dismouting soft connection lead wire procedure, protective apparatus reduces maintenance, operating personnel's work load, avoids maloperation and electric shock danger.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a generator transformer set system according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The working flow of the insulation value measurement of the existing generator-transformer group is as follows:
1. and (5) overhauling the work ticket.
2. The operating personnel need to stop the generator-transformer unit to take safety measures, hang the ground wire and close the grounding disconnecting link. A grounding knife switch or a group of grounding wires can be arranged on each side lead of the possible incoming calls.
3. And the rear part of the operator maintenance personnel is allowed to disassemble the soft lead for work.
4. And after the soft lead is removed and the cable from the neutral point of the generator to the neutral point of the voltage transformer is thrown away, contacting an operator to remove the grounding wire.
5. And measuring the insulation value of the strain generating group.
6. And after the measurement is finished, the safety measures of the generator-transformer unit are recovered, and the removed grounding wire and the grounding disconnecting link are closed again for recovery.
7. And (4) reconnecting the removed soft lead of the neutral point of the generator.
8. And ending the transaction work ticket.
9. The generator is converted into a standby state after an operator removes the grounding wire, pulls the grounding knife switch and other safety measures open.
The insulation measurement operation of the generator-transformer group is executed aiming at the existing generator-transformer group, the procedure is complex, misoperation is easy to occur to operating personnel, electric shock danger is easy to occur when the maintainer is not in contact with the generator-transformer group, the time is long, and the labor intensity of the operating personnel and the maintainer is high.
The embodiment provides a generator transformer set system, which changes the cable connection position of a generator neutral point and a generator outlet voltage transformer neutral point, and can meet the requirements of throwing away a cable during insulation measurement and connecting the cable to a primary system during operation only by switching on and switching off a grounding switch of the generator neutral point.
This embodiment provides a generator transformer set system, and fig. 1 is the utility model discloses a structural schematic of generator transformer set system that the embodiment provides. As shown in fig. 1, the generator transformer bank system includes: generator G1, main transformer T1, and outlet voltage transformer TV.
The generator G1 is connected to a high-voltage bus through a main transformer T1, and the outlet voltage transformer TV is connected to the output terminal of the generator G1.
In this embodiment, the outlet voltage transformers include a measurement voltage transformer 1TV, an excitation regulation voltage transformer 2TV, and an inter-turn protection voltage transformer 3 TV.
The generator G1 is connected with a first end (A side in figure 1) of a generator neutral point disconnecting link K1 through a neutral point connecting line, and a second end (B side in figure 1) of a generator neutral point disconnecting link K1 is grounded through a grounding transformer T2; the outlet voltage transformer neutral point is connected with the second end of the generator neutral point disconnecting link K1. Specifically, a neutral point C of the turn-to-turn protection voltage transformer is connected with a second end of the generator neutral point disconnecting link.
The neutral point grounding side of the generator neutral point disconnecting switch, namely the connecting point B in figure 1, is connected by changing a connecting cable between the generator neutral point and the outlet voltage transformer neutral point C. During generator insulation test, only need will send out the transformer group and have a power failure, pull open generator neutral point switch K1 simultaneously, generator outlet voltage transformer 3TV pull out the interval can, need not to dismantle the flexible coupling lead wire of generator neutral point switch to generator.
Specifically, the generator set insulation test was performed as follows:
1. and (5) the generator and transformer set is powered off, (a neutral point knife switch of the generator is pulled open, and a voltage transformer 3TV at the outlet of the generator is pulled out for separation). The outlet voltage transformer may be a trolley or drawer type voltage transformer requiring a pull out interval.
2. The hair change group insulation was measured.
3. And after the measurement is finished, restoring the generator-transformer group for later use.
The generator transformer set system that this embodiment provided improves the hookup location of export voltage transformer neutral point and generator neutral point, connects in the ground connection one side of ground connection switch, need not to dismantle the soft connection lead wire of generator neutral point switch to generator when carrying out insulation test to reduce dismouting soft connection lead wire procedure, protective apparatus reduces maintenance, operating personnel's work load, avoids maloperation and electric shock danger.
As shown in fig. 1, main transformer T1 is grounded through a parallel main neutral knife switch K2 and a current transformer L1. The output end of the generator G1 is also connected with an excitation transformer LC.
Optionally, the generator neutral knife switch K1 is provided with a locking device. The generator neutral point grounding knife switch operating mechanism must have a reliable locking device to prevent the knife switch from being pulled open during operation to influence the safe operation of the protection device.
As shown in fig. 1, the power generation system further includes a high-voltage service transformer CY, and the high-voltage service transformer CY is connected to the output end of the generator G1. And a current transformer L2 is arranged between the high-voltage station transformer CY and the output end of the generator G1.
The generator outlet voltage transformer is provided with generator turn-to-turn short circuit protection, the outlet voltage transformer neutral point is connected with the generator neutral point through a cable, and the cable connection point is arranged on the generator side of the generator neutral point grounding disconnecting link and can be improved to be arranged on the grounding transformer side of the generator neutral point grounding disconnecting link.
Also shown in fig. 1 is a current transformer L3 disposed between generator G1 and main transformer T1.
Further, the contact resistance of a neutral point disconnecting link of the generator needs to be measured regularly according to a maintenance plan, the generator outlet TV is provided with generator turn-to-turn short circuit protection, and otherwise, normal operation of protection is influenced.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention, and the scope of the present invention is defined by the appended claims.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A generator transformer bank system, comprising: the power generator, the main transformer and the outlet voltage transformer;
the generator is connected with a high-voltage bus through the main transformer, and the outlet voltage transformer is connected with the output end of the generator;
the generator is connected with a first end of a generator neutral point disconnecting link through a neutral point connecting wire, and a second end of the generator neutral point disconnecting link is grounded through a grounding transformer;
the outlet voltage transformer neutral is connected to the second end of the generator neutral disconnecting link.
2. The generator transformer bank system of claim 1, further comprising a neutral point current transformer;
the neutral point current transformer is connected between the generator and the generator neutral point disconnecting link.
3. The generator transformer bank system of claim 1, wherein the outlet voltage transformer comprises an inter-turn protection voltage transformer having a neutral point connected to the second end of the generator neutral point knife-switch.
4. The generator transformer bank system of claim 3, wherein the outlet voltage transformer further comprises a measurement voltage transformer and an excitation regulation voltage transformer.
5. The generator transformer bank system of any one of claims 1-4, wherein the main transformer is grounded through a parallel main transformer neutral knife-switch and a current transformer.
6. The generator-transformer bank system according to any one of claims 1-4, wherein an excitation transformer is further connected to the output of the generator.
7. Generator transformer block system according to any of claims 1-4, wherein the generator neutral knife-switch is provided with a blocking device.
8. The generator transformer bank system of any of claims 1-4, wherein the outlet voltage transformer is a trolley or drawer voltage transformer.
9. The generator transformer bank system of any one of claims 1-4, further comprising a high voltage service transformer connected to an output of the generator.
10. The generator transformer bank system of claim 9, wherein a current transformer is disposed between the high voltage service transformer and the output of the generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022550304.9U CN214041463U (en) | 2020-11-06 | 2020-11-06 | Generator transformer set system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022550304.9U CN214041463U (en) | 2020-11-06 | 2020-11-06 | Generator transformer set system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214041463U true CN214041463U (en) | 2021-08-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022550304.9U Active CN214041463U (en) | 2020-11-06 | 2020-11-06 | Generator transformer set system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214041463U (en) |
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2020
- 2020-11-06 CN CN202022550304.9U patent/CN214041463U/en active Active
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