CN211183403U - Inrush current suppression system of 220KV main transformer - Google Patents
Inrush current suppression system of 220KV main transformer Download PDFInfo
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- CN211183403U CN211183403U CN201921895229.0U CN201921895229U CN211183403U CN 211183403 U CN211183403 U CN 211183403U CN 201921895229 U CN201921895229 U CN 201921895229U CN 211183403 U CN211183403 U CN 211183403U
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Abstract
The utility model discloses a surge suppression system of a 220KV main transformer, which is characterized in that a phase selection switching-on and switching-off unit is connected into a main transformer closing loop circuit system, after a reference signal of the main transformer is acquired from a reference signal acquisition unit, generating a phase selection switching-on control signal according to a reference signal and the functions of a phase selection switching-on and switching-off unit, connecting an output end of a main transformer measurement and control unit with an input end of the phase selection switching-on and switching-off unit, connecting an output end of the phase selection switching-on and switching-off unit with an input end of a convergence control unit, transmitting the switching-on control signal to the phase selection switching-on and switching-off unit by the main transformer measurement and control unit, triggering the phase selection switching-on and switching-off unit to output the phase selection switching-on control signal to the convergence control unit, and finally carrying out switching-on operation on a main transformer according to the phase selection switching-on control signal by the; the technical problems that in the prior art, when a transformer is put in, excitation inrush current is too large, so that the transformer is not successfully switched on and fails in operation are solved.
Description
Technical Field
The utility model belongs to the technical field of the electric wire netting power supply technique and specifically relates to a 220KV main transformer inrush current suppression system is related to.
Background
With the rapid increase of economy and the continuous expansion of urban scale, in order to meet the power consumption requirements of enterprises and residents in cities, the quality of power supply is ensured, and therefore more high-voltage power grids enter the cities to solve the current power supply problem. More high-voltage power grids enter cities, the short-circuit current level of the urban power grids is improved, in order to solve the problem of high short circuit, a mode of effectively limiting the short-circuit current is provided through a high-impedance transformer, however, because the magnetizing inrush current of the high-impedance transformer is large in the charging stage, when a no-load transformer is excited and switched on, the circuit breaker is switched on to generate a large inrush current, so that the voltage of a power supply system fluctuates, the protection action occurs, and the switching-on is unsuccessful.
Adjusting the protection setting of the transformer is one way to avoid unsuccessful closing due to inrush current, but there are the following problems by adjusting the protection setting:
1. the protection override and system safety are easily caused by too large protection constant value adjusting range, so that the protection constant value adjusting range is limited, the protection constant value adjusting cannot avoid excitation surge current, and the transformer cannot be put into operation;
2. the protection constant value is adjusted only when the transformer is put into operation in no-load mode, the protection constant value needs to be modified into a protection constant value under normal operation after the transformer is put into operation, the work is complicated, and potential safety hazards exist;
3. after the transformer is put into operation, the transformer is cut off due to system faults and the like, and the fixed value needs to be modified when the transformer is put into operation again, so that the power supply cannot be quickly recovered;
4. due to the change of the data of the power grid, the protection fixed value adjustment cannot be completely wired to avoid the excitation inrush current, so that the transformer fails to be put into operation.
Therefore, how to realize reliable putting of the high impedance transformer becomes a technical problem which needs to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a 220KV main transformer inrush current suppression system, which can solve the technical problems of unsuccessful switching-on and failure in operation of the transformer caused by overlarge excitation inrush current when the transformer is put into operation in the prior art; the inrush current suppression system for the 220KV main transformer is reliable, stable and safe.
In a first aspect, an embodiment of the present invention provides a 220KV main transformer inrush current suppression system, which includes:
the reference signal acquisition unit is used for acquiring a reference signal of the 220KV main transformer;
the output end of the reference signal acquisition unit is connected with the input end of the phase selection switching-on and switching-off unit and is used for receiving the reference signal and generating a phase selection switching-on control signal according to the reference signal;
the main transformer measurement and control unit is used for acquiring a closing control signal of the 220KV main transformer and sending the closing control signal to the phase selection switching-on and switching-off unit, and the phase selection switching-on and switching-off unit triggers and outputs the phase selection closing control signal according to the received closing control signal;
and the output end of the phase selection switching-on and switching-off unit is connected with the input end of the convergence control unit, and the convergence control unit controls the 220KV main transformer to perform switching-on action according to the received phase selection switching-on control signal.
The utility model discloses 220KV main transformer inrush current suppression system has following beneficial effect at least: the method comprises the steps that a phase selection switching-on and switching-off unit is connected into an inrush current suppression system of a 220KV main transformer, after a reference signal of the 220KV main transformer is acquired from a reference signal acquisition unit, a phase selection switching-on control signal is generated according to the reference signal and the functions of the phase selection switching-on and switching-off unit, the output end of a main transformer measurement and control unit is connected with the input end of the phase selection switching-on and switching-off unit, the output end of the phase selection switching-on and switching-off unit is connected with the input end of a convergence control unit, the main transformer measurement and control unit transmits the switching-on control signal to the phase selection switching-on and switching-off unit, the phase selection switching-on and switching-off unit is triggered to output the phase selection switching-on and switching-off control signal to the convergence control unit, and finally the; the technical problems that in the prior art, the transformer is unsuccessfully switched on and fails to put into operation due to overlarge excitation inrush current when the transformer is put into operation are solved; the inrush current suppression system for the 220KV main transformer is reliable, stable and safe.
According to the utility model discloses a 220KV main transformer inrush current suppression system of other embodiments, the reference signal acquisition unit includes the high-voltage output port and the voltage transformer of the 20KV main transformer, the high-voltage output port is connected with the first input end of the phase selection opening and closing unit, and is used for sending the first high-voltage reference signal output by the high-voltage output port to the phase selection opening and closing unit; the voltage transformers are respectively arranged at low-voltage output interfaces of the 220KV main transformer and form second high-voltage reference signals with the low-voltage output interfaces of the 220KV main transformer, and output ends of the voltage transformers are connected with second input ends of the phase selection switching-on and switching-off units so as to send the second high-voltage reference signals to the phase selection switching-on and switching-off units.
According to the utility model discloses a 220KV main transformer inrush current suppression system of other embodiments, voltage transformer with be provided with air switch between the second input of selection looks separating brake unit.
According to the utility model discloses a 220KV main transformer inrush current suppression system of other embodiments, phase selection divide-shut brake unit is circuit breaker phase selection divide-shut brake device, high-pressure output port with circuit breaker phase selection divide-shut brake device's first input is connected, voltage transformer's output with circuit breaker divide-shut brake device's second input is connected.
According to the utility model discloses a 220KV main transformer inrush current suppression system of other embodiments, voltage transformer is 10KV voltage transformer.
According to the inrush current suppression system of the 220KV main transformer according to other embodiments of the present invention, the inrush current suppression system of the 220KV main transformer further includes a first main transformer protection screen, a second main transformer protection screen, and a third main transformer protection screen;
the first main transformer protection screen is respectively connected with the main transformer measurement and control unit, the third main transformer protection screen, the second main transformer protection screen and the collection and control unit, and the first main transformer protection screen is used for realizing first main protection of the 220KV main transformer and a medium-voltage side operation loop of the 220KV main transformer;
the second main transformer protection screen is respectively connected with the third main transformer protection screen and the junction control unit, and the second main transformer protection screen is used for realizing second main protection of the 220KV main transformer and a low-voltage side operation loop of the 220KV main transformer;
the phase selection switching-on and switching-off unit is arranged in the third main transformer protection screen, the third main transformer protection screen is connected with the junction control unit, and the third main transformer protection screen is used for realizing third main protection of the 220KV main transformer and a low-voltage side operation loop of the 220KV main transformer.
Drawings
Fig. 1 is a schematic connection diagram of an embodiment of a inrush current suppression system for a 220KV main transformer according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an embodiment of a control loop of a inrush current suppression system for a 220KV main transformer according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an embodiment of an operation circuit of a phase selection switching-on/off unit of a inrush current suppression system of a 220KV main transformer according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an embodiment of the present invention, in which a reference signal obtaining unit is connected to a phase selection switching-on/off unit in an inrush current suppression system of a 220KV main transformer.
Detailed Description
The conception and the resulting technical effects of the present invention will be described clearly and completely with reference to the following embodiments, so that the objects, features and effects of the present invention can be fully understood. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention.
Referring to fig. 1, in an embodiment of the present invention, an inrush current suppression system for a 220KV main transformer includes a reference signal acquisition unit, a main transformer measurement and control unit, a phase selection switching-on/off unit, and a convergence control unit; the output end of the reference signal acquisition unit is connected with the input end of the phase selection switching-on and switching-off unit, the reference signal of the 220KV main transformer acquired by the reference signal acquisition unit is transmitted to the phase selection switching-on and switching-off unit, and the phase selection switching-on and switching-off unit generates a phase selection switching-on control signal according to the received reference signal. Meanwhile, the output end of the main transformer measurement and control unit is connected with the input end of the phase selection switching-on and switching-off unit, the switching-on control signal of the 220KV main transformer acquired by the main transformer measurement and control unit is transmitted to the phase selection switching-on and switching-off unit, the output end of the phase selection switching-on and switching-off unit is connected with the input end of the convergence control unit, the phase selection switching-on and switching-off unit triggers and outputs the phase selection switching-on control signal to the convergence control unit after receiving the switching-on control signal, and the convergence control unit controls the 220KV main transformer to perform switching-on action according.
The embodiment of the utility model provides a 220KV main transformer inrush current suppression system, through string income selection looks closing and separating unit in 220KV main transformer combined gate return circuit, the reference signal of 220KV main transformer that will reference the reference signal acquisition unit and acquire carries out the selection looks logical operation, generate selection looks closing control signal, after receiving the closing control signal that comes from main transformer measurement and control unit, output selection looks closing control signal to the collection accuse unit, the collection accuse unit carries out the combined gate action according to selection looks closing control signal control 220KV main transformer, thereby effectively avoided among the prior art because when switching on to 220KV main transformer, because produce the excitation inrush current and lead to the unsuccessful technical problem of closing a floodgate; the 220KV main transformer is controlled to be switched on according to the phase selection switching-on control signal, so that the switching-on of moving and static contacts of a circuit breaker of the 220KV main transformer at a specified phase angle of a system voltage waveform is realized, and when a no-load transformer is switched in, the electromagnetic transient effects such as overvoltage and inrush current impact are effectively inhibited, so that the main transformer is switched into an electric power system under the condition of minimum impact on the main transformer and the system, and the reliable, stable and safe 220KV main transformer inrush current inhibition system is provided.
Referring to fig. 2, fig. 2 is a schematic diagram of a specific embodiment of a control loop of a 2220KV main transformer inrush current suppression system according to the present invention. In the embodiment of the present invention, the phase selection switching-on and switching-off unit is a circuit breaker phase selection switching-on and switching-off device 20, and the 220KV main transformer inrush current suppression system further includes a first main transformer protection screen 50, a second main transformer protection screen 90, and a third main transformer protection screen 30; the first main transformer protection screen 50 is respectively connected with the main transformer measurement and control unit 10, the third main transformer protection screen 30, the second main transformer protection screen 90 and the junction control unit 40, and the first main transformer protection screen 50 is used for realizing first main protection of a 220KV main transformer and a medium-voltage side operation loop of the 220KV main transformer; the second main transformer protection screen 90 is respectively connected with the third main transformer protection screen 30 and the junction control unit 40, and the second main transformer protection screen 90 is used for realizing second main protection of the 220KV main transformer and a low-voltage side operation loop of the 220KV main transformer; the circuit breaker phase selection and switching-on/off device 20 is disposed in a third main transformer protection screen 30 (two '20' in the figure are identified as the same circuit breaker phase selection and switching-on/off device, and the figure shows that the circuit breaker phase selection and switching-on/off device 20 is in two different loops), the third main transformer protection screen 30 is connected with the control unit 40, and the third main transformer protection screen 30 is used for realizing second main protection of a 220KV main transformer and a low-voltage side operation loop of the 220KV main transformer. Furthermore, the embodiment of the present invention provides a 2220KV main transformer inrush current suppression system in the control circuit further includes a 220KV bus and a failure protection screen 60, a first non-electric main transformer protection screen 70, a first auxiliary main transformer protection screen 80, a 220KV bus and a failure protection screen two 100, a second non-electric main transformer protection screen 110, and a second auxiliary main transformer protection screen 120, and the connection relationship of each component in the control circuit can be shown with reference to fig. 2.
Referring to fig. 3, fig. 3 is a schematic diagram of a specific embodiment of an operation circuit of a phase selection switching-on/off unit of a inrush current suppression system of a 220KV main transformer of the present invention, wherein a circuit breaker phase selection switching-on/off device includes a phase selection switch module 21, a circuit breaker auxiliary contact module 22, and a phase selection control signal output module 23; the main transformer measurement and control module 10 is sequentially connected in series with the phase selection switch module 21, the circuit breaker auxiliary contact module 22, the phase selection control signal output module 23 and the convergence control unit 40, after the received switching-on control signal is transmitted to the phase selection switch module 21, the phase selection switch module 21 generates a phase selection switching-on control signal and controls the corresponding switch node in the circuit breaker auxiliary contact module 22 to be closed, and then the phase selection switching-on control signal is transmitted to the convergence control unit 40 through the phase selection control signal output module 23, so that safe and reliable switching-on of the 220KV main transformer is realized.
Referring to fig. 4, fig. 4 is a schematic diagram of an embodiment of the present invention, in which a reference signal obtaining unit is connected to a phase selection switching-on/off unit in an inrush current suppression system of a 220KV main transformer. The embodiment of the utility model provides an in, reference signal obtains the unit and includes 20KV main transformer's high-pressure output port 150 and voltage transformer 130, high-pressure output port 150 is connected with the first input 24 of selection looks divide-shut brake unit (circuit breaker divide-shut brake device promptly), be used for sending the first high-pressure reference signal of high-pressure output port 150 output to circuit breaker divide-shut brake device, voltage transformer 130 sets up in 220KV main transformer's low pressure output kneck, and form second high-pressure reference signal with 220KV main transformer's low pressure output interface, voltage transformer 130's output and selection looks divide-shut brake unit's second input 23 are connected, in order to send second high-pressure reference signal to selection looks divide-shut brake unit. The first high-voltage reference signal and the second high-voltage reference signal form a reference signal of the 220KV main transformer. In addition, an air switch 140 is arranged between the output end of the voltage transformer 130 and the second input end 23 of the phase selection switching-on/off unit, the air switch 140 is arranged so that the air switch 140 trips when a short circuit occurs in the system to achieve the purpose of protecting the phase selection switching-on/off unit, the output interface of the first main transformer protection screen 50 is also connected with the second input end 23 of the phase selection switching-on/off unit, and the air switch is arranged so that the system coordination is improved.
To sum up, the embodiment of the utility model provides a 220KV main transformer inrush current suppression system through concatenating in 220KV main transformer combined floodgate return circuit and select looks separating brake unit, has realized that the circuit breaker at 220KV main transformer moves, the static contact is closed a floodgate in the appointed phase angle department of system voltage waveform, provides a reliable, stable, safe 220KV main transformer inrush current suppression system.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
Claims (6)
1. A220 KV main transformer inrush current suppression system, comprising:
the reference signal acquisition unit is used for acquiring a reference signal of the 220KV main transformer;
the output end of the reference signal acquisition unit is connected with the input end of the phase selection switching-on and switching-off unit and is used for receiving the reference signal and generating a phase selection switching-on control signal according to the reference signal;
the main transformer measurement and control unit is used for acquiring a closing control signal of the 220KV main transformer and sending the closing control signal to the phase selection switching-on and switching-off unit, and the phase selection switching-on and switching-off unit triggers and outputs the phase selection closing control signal according to the received closing control signal;
and the output end of the phase selection switching-on and switching-off unit is connected with the input end of the convergence control unit, and the convergence control unit controls the 220KV main transformer to perform switching-on action according to the received phase selection switching-on control signal.
2. The inrush current suppression system for a 220KV main transformer according to claim 1, wherein the reference signal obtaining unit comprises a high-voltage output port of the 20KV main transformer and a voltage transformer, the high-voltage output port is connected to the first input end of the phase-selection switching-on/off unit, and is configured to send a first high-voltage reference signal output by the high-voltage output port to the phase-selection switching-on/off unit; the voltage transformer is arranged at a low-voltage output interface of the 220KV main transformer and forms a second high-voltage reference signal with the low-voltage output interface of the 220KV main transformer, and an output end of the voltage transformer is connected with a second input end of the phase selection switching-on/off unit so as to send the second high-voltage reference signal to the phase selection switching-on/off unit.
3. The inrush current suppression system for a 220KV main transformer according to claim 2, wherein an air switch is disposed between the voltage transformer and the second input terminal of the phase-selection opening and closing unit.
4. The inrush current suppression system for a 220KV main transformer according to claim 2 or 3, wherein the phase selection switching-on/off unit is a phase selection switching-on/off device of a circuit breaker, the high-voltage output port is connected with a first input end of the phase selection switching-on/off device of the circuit breaker, and an output end of the voltage transformer is connected with a second input end of the phase selection switching-on/off device of the circuit breaker.
5. The 220KV main transformer inrush current suppression system of claim 2 or 3, wherein the voltage transformers are 10KV voltage transformers.
6. The 220KV main transformer inrush current suppression system of any one of claims 1 to 3, wherein the 220KV main transformer inrush current suppression system further comprises a first main transformer protection screen, a second main transformer protection screen, and a third main transformer protection screen;
the first main transformer protection screen is respectively connected with the main transformer measurement and control unit, the third main transformer protection screen, the second main transformer protection screen and the collection and control unit, and the first main transformer protection screen is used for realizing first main protection of the 220KV main transformer and a medium-voltage side operation loop of the 220KV main transformer;
the second main transformer protection screen is respectively connected with the third main transformer protection screen and the junction control unit, and the second main transformer protection screen is used for realizing second main protection of the 220KV main transformer and a low-voltage side operation loop of the 220KV main transformer;
the phase selection switching-on and switching-off unit is arranged in the third main transformer protection screen, the third main transformer protection screen is connected with the junction control unit, and the third main transformer protection screen is used for realizing third main protection of the 220KV main transformer and a low-voltage side operation loop of the 220KV main transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921895229.0U CN211183403U (en) | 2019-11-05 | 2019-11-05 | Inrush current suppression system of 220KV main transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921895229.0U CN211183403U (en) | 2019-11-05 | 2019-11-05 | Inrush current suppression system of 220KV main transformer |
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| CN211183403U true CN211183403U (en) | 2020-08-04 |
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| CN201921895229.0U Active CN211183403U (en) | 2019-11-05 | 2019-11-05 | Inrush current suppression system of 220KV main transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112763801A (en) * | 2021-04-07 | 2021-05-07 | 国网江西省电力有限公司电力科学研究院 | Method for measuring maximum switching phase angle of phase selection switching-on device of extra-high voltage converter station |
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2019
- 2019-11-05 CN CN201921895229.0U patent/CN211183403U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112763801A (en) * | 2021-04-07 | 2021-05-07 | 国网江西省电力有限公司电力科学研究院 | Method for measuring maximum switching phase angle of phase selection switching-on device of extra-high voltage converter station |
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