CN218243018U - Novel fast saturated damper and capacitive voltage transformer in CVT of intelligent substation - Google Patents
Novel fast saturated damper and capacitive voltage transformer in CVT of intelligent substation Download PDFInfo
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- CN218243018U CN218243018U CN202222383406.5U CN202222383406U CN218243018U CN 218243018 U CN218243018 U CN 218243018U CN 202222383406 U CN202222383406 U CN 202222383406U CN 218243018 U CN218243018 U CN 218243018U
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Abstract
The utility model provides a novel speed saturation damper in an intelligent substation CVT, which is characterized in that a control component and a load component are connected in series on a secondary auxiliary winding of the CVT through ferromagnetic resonance, wherein the control component can be an air switch and the load component is a linear resistor; when the system drops into CVT, arrange air switch in the combined floodgate state, treat that the system is stable after, arrange air switch in the separating brake state, utilize the switching-on or reversing of this resistance of this air switch control to eliminate the resonance phenomenon of CVT at the input in-process, can ensure system safety, reliable operation, solved some intelligent substation CVTs of present stage and drop into the resonance problem that the in-process takes place.
Description
Technical Field
The utility model relates to an intelligent substation CVT secondary system technical field, novel fast saturated damper and capacitive voltage transformer among the concretely relates to intelligent substation CVT.
Background
Capacitor Voltage Transformer (CVT), which is widely used in voltage classes of 110kv and above, has been widely popularized in intelligent substations in recent years. In some specific situations (such as impact operation or harmonic intrusion and the like), the fast saturation damper is one of important devices of the electromagnetic unit, and is used in the electromagnetic unit to limit overvoltage appearing on one or more components, improve transient response characteristics of a capacitor or a voltage transformer and meet requirements of a fast power system relay protection device. Conventional fast saturated attenuator can not reliably damp ferroresonance, causes CVT secondary voltage to appear subferroresonance, and these low-amplitude subharmonics are difficult to attenuate, lead to the secondary voltage to fluctuate easily, so lead to CVT self trouble, influence secondary equipment, can threaten electric power system safety and stability when serious.
SUMMERY OF THE UTILITY MODEL
In view of this, the to-be-solved problem of the present invention is to provide a novel speed saturation damper and a capacitance type voltage transformer in an intelligent substation CVT, so as to eliminate the occurrence of ferroresonance in the intelligent substation under specific conditions.
In order to solve the technical problem, the utility model adopts the technical scheme that:
the novel speed saturation damper in the intelligent substation CVT comprises a control component and a load component connected with the control component in series, wherein the control component and the load component are connected to a secondary auxiliary winding of the CVT through connecting lines, and the control component is used for controlling the switching of the load component.
In the present invention, preferably, the load component is a resistor.
In the present invention, it is preferable that the load component is a reactance having a fast saturation characteristic.
In the present invention, further, the control component includes a switch with a rated voltage of 220V.
In the present invention, preferably, the switch is an air switch.
In the present invention, further, the resistance value of the resistor ranges from 200 ohms to 400 ohms.
The capacitor voltage transformer comprises a transformer, wherein a wire outlet terminal of a secondary auxiliary winding of the transformer is connected with the novel fast saturation damper.
The utility model discloses in, preferred, novel fast saturated attenuator is installed capacitive voltage transformer's protective screen is cashier's office in a shop.
The utility model discloses in, it is further, the primary winding of transformer is connected with high-voltage capacitor, middling pressure electric capacity and compensation reactance sense and arrester.
The utility model has the advantages and positive effects that:
the utility model connects the control component and the load component in series on the secondary auxiliary winding of the CVT with ferromagnetic resonance, and the control component can be an air switch and a linear resistor of the load component in a preferred mode; when the system drops into CVT, arrange air switch in the combined floodgate state, treat that the system is stable after, arrange air switch in the separating brake state, utilize the switching-on and going-off of this resistance of this air switch control to eliminate the resonance phenomenon of CVT at the input in-process, can ensure system safety, reliable operation, solved the resonance problem that intelligent substation CVT takes place at present stage at the input in-process. The utility model discloses rational in infrastructure and compact, convenient to use has overcome the problem that original fast saturated attenuator can not reliably damp ferromagnetic resonance.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is an overall structure diagram of a novel speed saturation damper in a CVT of an intelligent substation;
fig. 2 is a schematic structural diagram of a CVT in the intelligent substation of the present invention;
fig. 3 is a schematic view of the installation of the CVT and the new velocity saturation damper of the present invention;
fig. 4 is a schematic diagram of the voltage-current variation in the novel fast saturation damper for the CVT of the intelligent substation of the present invention;
in the figure: 2. a secondary auxiliary winding; 3. a conventional fast saturation damper; 4. a secondary auxiliary winding outlet terminal; 5. an air switch; 6. a linear resistance; 7. and connecting the wires.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the prior art, a merging unit in an intelligent substation is different from a CVT secondary load of a conventional substation, wherein the load of the CVT secondary load is only a few watts under normal work, and the CVT secondary load belongs to a light load property (a CVT secondary side is approximately in an unloaded state); the latter is mostly relay, pointer voltmeter, and the load is about tens of watts. The intelligent station CVT secondary circuit has small self resistance, so that low-amplitude subharmonics are difficult to attenuate, and secondary voltage continuous fluctuation is easily caused. And ferromagnetic resonance cannot be reliably damped only by switching in a general conventional speed saturation damper 3, so that secondary ferromagnetic resonance of CVT secondary voltage is caused to occur.
As shown in fig. 1 and 3, the utility model provides a novel fast saturation damper in intelligent substation CVT, including control assembly and with the load component that control assembly establishes ties, control assembly and the load component is connected to through connecting wire 7 on the secondary auxiliary winding 2 of CVT, specifically on secondary auxiliary winding terminal outgoing lines 4, this secondary auxiliary winding 2 terminal outgoing lines are located the CVT outside, wherein control assembly is used for control the switching of load component.
Specifically, when the intelligent substation bus or the line is charged, the control assembly in the novel fast saturation damper is controlled to be put into operation, and after the power transmission is normal, the control assembly controls the load assembly to withdraw. So through putting on or off of control assembly control load subassembly, increase CVT load, thereby eliminate CVT and put into the resonance phenomenon of in-process with higher speed damping ferroresonance, can ensure system safety, reliable operation, solved some intelligent substation CVT resonance problems that take place at the in-process that puts into at present stage.
In another embodiment provided by the utility model, novel fast saturated damper acts on supplementary secondary 2 outside the CVT with conventional attenuator 3 jointly, that is to say with conventional fast saturated damper 3 parallelly connected with the novel fast saturated damper that this scheme provided to reach the effect of better damping resonance, in order to satisfy more demands.
In the present invention, preferably, the load component is a resistor and/or a reactance with a fast saturation characteristic, the resistor can be linear or non-linear, wherein the resistance value of the linear resistor 6 ranges from 200 ohms to 400 ohms, and the rated withstand voltage is 1500-2500 volts (the output voltage is 2500V lowest megaohm meter is considered as the withstand voltage). It should be noted that, in general, the resistance value of the resistor is large, and the resonance suppression effect is obvious.
The utility model discloses in, it is further, control assembly includes that rated voltage is 220V's switch, in an embodiment the switch is air switch 5, but is not limited to air switch 5, if also can be other manual switch, the condition that needs to satisfy be 220V rated voltage and realize control function switch can.
Specifically, according to the scheme, a linear resistor 6 is additionally arranged on the auxiliary winding of the CVT, an air switch 5 is arranged on a loop, the air switch 5 is placed at a switching-on position when the CVT is switched in, and the linear resistor 6 is switched into a system; after the CVT has stabilized, the air switch 5 is put in the open position, cutting off the linear resistor 6. Therefore, the air switch 5 is used for controlling the on-off of the linear resistor 6, so that the ferromagnetic resonance of the CVT of the intelligent substation is eliminated.
In the utility model discloses in, preferably, as shown in fig. 3, air switch 5 and linear resistance 6 accessible connecting wire 7 arrange this novel fast saturated attenuator in different positions, and the ideal placement point can be placed install on CVT's protection screen cabinet to fortune dimension personnel operate.
The utility model provides a in another embodiment, provide a Capacitance Voltage Transformer (CVT), including transformer T, transformer T's secondary auxiliary winding terminal outgoing lines 4 is connected with novel fast saturated attenuator, wherein, novel fast saturated attenuator sets up in transformer T secondary auxiliary winding 2's the outside.
Specifically, as shown in fig. 2 and 3, the primary winding of the transformer T is connected to a high-voltage capacitor C1, a medium-voltage capacitor C2, a compensation reactance L0 and a lightning arrester F, where N in the drawings is a low-voltage end of the capacitive voltage divider, and E is a ground end. The secondary winding of the transformer T includes: 1a and 1n are primary and secondary No. 1 windings, and 2a and 2n are primary and secondary No. 2 windings; 3a, 3n primary and secondary No. 3 windings; ZD2 is a primary and secondary winding damping device; da. A dn secondary auxiliary winding terminal; ZD1 is the new type of fast saturation damper of this scheme. Therefore, the novel fast saturation damper of the scheme is connected between the secondary auxiliary windings da and dn of the transformer T.
Further, as shown in fig. 4, when the system exceeds the excitation voltage (generally, the secondary voltage is 130V), the compensation inductance L0 in the novel fast saturation damper rapidly enters the saturation state from the unsaturated state, the inductance value thereof rapidly decreases, and at this time, the air switch 5 controls the resistance to be connected into the loop, so as to consume enough power to eliminate the ferromagnetic resonance.
The utility model has the advantages and positive effects be:
the utility model discloses a control assembly and a load assembly are connected in series on a ferromagnetic resonance CVT secondary auxiliary winding 2, wherein the control assembly can be an air switch 5 and a load assembly linear resistor 6; when the system drops into the CVT, the air switch 5 is placed in a closing state, after the system is stable, the air switch 5 is placed in an opening state, the air switch 5 is used for controlling the resistance to be switched on and off, therefore, the resonance phenomenon of the CVT in the dropping process is eliminated, the system can be ensured to run safely and reliably, and the resonance problem of the CVT in some intelligent substations in the current stage in the dropping process is solved. The utility model has the advantages of reasonable and compact structure, convenient to use has overcome the problem that original novel fast saturated damper can not reliably damp ferroresonance, effectively solves the problem that ferroresonance appears in intelligent substation CVT.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All the equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.
Claims (9)
1. The novel speed saturation damper in the CVT of the intelligent substation is characterized by comprising a control assembly and a load assembly connected with the control assembly in series, wherein the control assembly and the load assembly are connected to a secondary auxiliary winding of the CVT through a connecting line, and the control assembly is used for controlling the load assembly to be turned on or off.
2. The novel speed saturation damper in an intelligent substation CVT of claim 1 wherein the load component is a resistor.
3. The novel speed saturation damper in an intelligent substation CVT of claim 1 wherein the load component is a reactance of speed saturation characteristics.
4. The novel speed saturation damper in an intelligent substation CVT of claim 1, characterized in that the control component includes a switch rated at 220V.
5. The novel speed saturation damper in an intelligent substation CVT of claim 4, characterized in that the switch is an air switch.
6. The novel speed saturation damper in the intelligent substation CVT of claim 2, characterized in that the resistance value range of the resistor is 200 ohms to 400 ohms.
7. A capacitor voltage transformer, characterized in that, it comprises a transformer, the outlet terminal of the secondary auxiliary winding of the transformer is connected with the new type rapid saturation damper of any one of claims 1-6.
8. The capacitive voltage transformer of claim 7, wherein the novel fast saturation damper is mounted on a protective screen cabinet of the capacitive voltage transformer.
9. A capacitive voltage transformer according to claim 7, characterized in that a high voltage capacitor, a medium voltage capacitor and a compensating reactance and lightning arrester are connected to the primary winding of the transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222383406.5U CN218243018U (en) | 2022-09-08 | 2022-09-08 | Novel fast saturated damper and capacitive voltage transformer in CVT of intelligent substation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222383406.5U CN218243018U (en) | 2022-09-08 | 2022-09-08 | Novel fast saturated damper and capacitive voltage transformer in CVT of intelligent substation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218243018U true CN218243018U (en) | 2023-01-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222383406.5U Active CN218243018U (en) | 2022-09-08 | 2022-09-08 | Novel fast saturated damper and capacitive voltage transformer in CVT of intelligent substation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218243018U (en) |
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2022
- 2022-09-08 CN CN202222383406.5U patent/CN218243018U/en active Active
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