CN218161781U - Accurate phase control switching-on device for inhibiting switching-on inrush current of transformer - Google Patents
Accurate phase control switching-on device for inhibiting switching-on inrush current of transformer Download PDFInfo
- Publication number
- CN218161781U CN218161781U CN202220882799.1U CN202220882799U CN218161781U CN 218161781 U CN218161781 U CN 218161781U CN 202220882799 U CN202220882799 U CN 202220882799U CN 218161781 U CN218161781 U CN 218161781U
- Authority
- CN
- China
- Prior art keywords
- transformer
- execution unit
- switching
- measurement
- measuring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Protection Of Transformers (AREA)
Abstract
The utility model discloses an accurate accuse closing device who restraines transformer combined floodgate inrush current utilizes accurate accuse closing device and combines remanence calculation technique to realize no-load transformer's zero inrush current and put into operation. The accurate phase control closing device comprises three measuring PT, an execution unit and a comprehensive command unit. When the transformer needs to be put into operation, the comprehensive command unit selects and sets a switching-on angle according to the residual magnetism data and a signal of PT measured at the upper end of the execution unit to control the execution unit to conduct switching-on, and the transformer is put into operation without inrush current; when the transformer quits operation, the comprehensive command unit commands the quick circuit breaker in the execution unit to realize a quick on-off function, and the comprehensive command unit automatically calculates the residual magnetism of the transformer according to signals of PT measurement and CT measurement at the lower end of the execution unit to prepare for next operation. The utility model discloses an have safe and reliable, protection transformer and other accessory equipment avoid receiving advantages such as combined floodgate surge impact, improve equipment's life-span.
Description
Technical Field
The utility model relates to a transformer combined floodgate inrush current restraines and power electronics technical field, concretely relates to accurate floodgate device of controlling mutually that restraines transformer combined floodgate inrush current.
Background
Along with the development of economy, the power load is increased sharply, in order to adapt to the increasing capacity of the load and the application of a super-capacity transformer, impact on the transformer and a system caused by switching-on inrush current is inevitable when a large transformer is put into operation, the service life of the transformer is shortened, and the operation stability of a power system is influenced. In order to solve the impact of inrush current on a transformer and a system, an existing split-phase switching-on strategy applied in the market cannot calculate residual magnetism or realize accurate switching-on because of the limitation of a technical principle and the limitation of a hardware executing mechanism, so that the inhibition effect on the switching-on inrush current of the transformer is poor.
The method for suppressing the switching-on inrush current of the transformer is a subject which must be broken through from the development of a power grid, has the development prospect at present, and is the most thorough method for suppressing the switching-on inrush current of the transformer according to the residual magnetism accurate phase control switching-on method of the transformer, so that an accurate phase control switching-on device for suppressing the switching-on inrush current of the transformer is developed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a pair of restrain accurate switching-on device that controls mutually of transformer combined floodgate inrush current can solve above-mentioned technical problem.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an accurate phase control switching-on device for inhibiting switching-on inrush current of a transformer comprises a measurement PT1 unit, a measurement PT2 unit, a measurement CT3 unit, an execution unit and a comprehensive command unit;
one end of a measuring PT1 is connected with the bus, and the other end of the measuring PT1 is grounded;
the wire inlet end of the execution unit is connected with the bus, the wire outlet end of the execution unit is connected with the high-voltage end of the measurement PT2 in series, and the low-voltage end of the measurement PT2 is grounded;
the wire inlet end of the measuring CT3 is connected with the wire outlet end of the execution unit in series, and the wire outlet end of the measuring CT3 is the wire outlet end of the device;
the comprehensive command unit monitors a voltage signal of a power supply side in real time by using a measurement PT (potential transformer), and sends a command to the execution unit according to the voltage signal when the transformer needs to be put into operation;
when the transformer quits operation, the comprehensive command unit executes a switching-on/off command according to a breaker in the execution element, and calculates the residual magnetism of the transformer core according to voltage and current signals of a load side detected by the measuring PT and the measuring CT so as to prepare for next switching-on operation of the transformer.
Furthermore, the execution unit comprises a circuit breaker and a bidirectional thyristor, and except the A-phase circuit breaker, the B, C phase circuit breaker is connected with the bidirectional thyristor (SCR) in parallel.
According to the technical scheme, the accurate phase control switching-on device for inhibiting the transformer switching-on inrush current has the advantages of protecting the transformer and other accessory equipment from being impacted by the switching-on inrush current, being safe and reliable and being simple to operate, when the transformer needs to be put into operation, the comprehensive command unit selects the automatic ideal switching-on angle control execution unit to switch on according to residual magnetic data and signals for measuring PT, and the transformer is put into operation without inrush current; when the transformer quits operation, the comprehensive command unit automatically calculates the residual magnetism of the transformer according to signals of the PT measurement and the CT measurement at the lower end of the execution unit, and prepares for next operation.
Drawings
Fig. 1 is a schematic view of the patent system of the present invention;
fig. 2 is a schematic diagram of an electrical connection of an execution unit according to the present invention;
fig. 3 is a logic diagram of the control action of the integrated command unit of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
As shown in fig. 1, an accurate phase-controlled switching-on device for suppressing switching-on inrush current of a transformer utilizes the accurate phase-controlled switching-on device and combines with an accurate calculation technology of remanence to realize zero inrush current commissioning of a no-load transformer. Accurate switching-on device that phased array includes: measurement PT1, measurement PT2, measurement CT3, execution unit 4, and integrated command unit.
One end of a measuring PT1 is connected with the bus, and the other end of the measuring PT1 is grounded; the wire inlet end of the execution unit 4 is connected with the bus, the wire outlet end of the execution unit 4 is connected with the high-voltage end of the measurement PT2 in series, and the low-voltage end of the measurement PT2 is grounded; the inlet end of the measuring CT3 is connected in series with the outlet end of the execution unit 4, and the outlet end of the measuring CT3 is the outlet end of the device.
The measurement PT1 and the measurement PT2 are high-precision voltage transformers; and the measuring CT3 is a high-precision current transformer and monitors the loop current in real time.
The execution unit 4 (as shown in fig. 2) is composed of a high-speed circuit breaker (K) and a bidirectional thyristor (SCR), and except for the a-phase circuit breaker (K), the B, C phase circuit breaker (K) is connected in parallel with the bidirectional thyristor (SCR).
The closing time of a high-speed circuit breaker (K) in the execution unit 4 is not more than 10ms, the opening time is not more than 5ms, the fault current can be quickly cut off, the reliability is high, the stability is high, and the operation life can be more than ten thousand times.
The bidirectional thyristor (SCR) in the execution unit 4 has a microsecond conduction characteristic, and has a characteristic of conducting zero-dispersion and zero-pre-discharge precise conduction.
And the comprehensive command unit monitors a voltage signal of the power supply side in real time by measuring PT1, and selects a proper time for sending a command to the execution unit according to the voltage signal when the transformer needs to be put into operation.
When the transformer quits operation, the comprehensive command unit calculates the residual magnetism of the transformer core according to voltage and current signals of the load side detected by the PT2 and the CT3 after the execution element 4 is switched on, and prepares for next switching-on operation of the transformer.
The working principle is as follows: referring to fig. 1, 2 and 3, the initial residual magnetism of the transformer is stored in the controller, the voltage signal at the power supply side is monitored in real time by measuring the PT1, and when the transformer needs to be put into operation, the on-off time of the execution unit 4 is automatically calculated according to the residual magnetism and the voltage signal, and an execution command is sent. When the execution unit 4 receives a switching-on command, the A-phase circuit breaker is switched on firstly, a single-phase conduction loop does not generate current, the B-phase thyristor (SCR) is conducted after 20ms delay, then the C-phase thyristor (SCR) is conducted, and accurate phase control conduction is realized by utilizing microsecond conduction characteristics of the thyristors, so that zero inrush current electrification of a thrown transformer is realized; in the continuous conduction process of the B, C phase thyristor, the B, C phase breaker is switched on, and the operation of the transformer is completed to realize the stable operation of the transformer.
When the transformer is out of operation, the comprehensive command unit commands a three-phase circuit breaker (K) in the execution unit 4 to rapidly open the brake, the comprehensive command unit measures the voltage and current signal changes in real time by using the measurement PT2 and the measurement CT3, and the residual magnetism of the transformer is calculated according to the measured voltage and current signals to prepare for the next operation.
Generally speaking, the embodiment of the utility model provides an utilize accurate controlling floodgate device mutually and combine remanence calculation technique to realize no-load transformer's zero inrush current and put into operation. Accurate switching-on device that phased array includes: measurement PT1, measurement PT2, measurement CT3, execution unit 4, and integrated command unit. When the transformer needs to be put into operation, the comprehensive command unit selects an ideal conduction switching-on time to control the execution unit 4 to switch on according to residual magnetism data and a signal of a PT1 measured by the upper end of the execution unit 4, and the transformer is put into operation without inrush current; when the transformer quits operation, the comprehensive command unit calculates the residual magnetism of the transformer according to signals of the PT2 and the CT3 measured at the lower end of the execution unit, and prepares for next operation.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (2)
1. An accurate phase control switching-on device for restraining switching-on inrush current of a transformer comprises a measuring PT1, a measuring PT2, a measuring CT3, an execution unit (4) and a comprehensive command unit; it is characterized in that the preparation method is characterized in that,
one end of a measuring PT1 is connected with the bus, and the other end of the measuring PT1 is grounded;
the wire inlet end of the execution unit (4) is connected with the bus, the wire outlet end of the execution unit (4) is connected with the high-voltage end of the measurement PT2 in series, and the low-voltage end of the measurement PT2 is grounded;
the wire inlet end of the measuring CT3 is connected with the wire outlet end of the execution unit (4) in series, and the wire outlet end of the measuring CT3 is the wire outlet end of the device;
the comprehensive command unit monitors a voltage signal of a power supply side in real time by using the measurement PT1, and sends a command to the execution unit according to the voltage signal selection when the transformer needs to be put into operation;
when the transformer quits operation, the comprehensive command unit executes a switching-on/off command according to a breaker in the execution unit (4), calculates the residual magnetism of the transformer core according to voltage and current signals of a load side detected by the measurement PT2 and the measurement CT3, and prepares for next switching-on operation of the transformer.
2. The accurate phase-control switching-on device for suppressing the switching-on inrush current of the transformer according to claim 1, wherein: the execution unit (4) comprises a circuit breaker and a bidirectional thyristor, and except for the A-phase circuit breaker, the B, C phase circuit breaker is connected with the bidirectional thyristor in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220882799.1U CN218161781U (en) | 2022-04-15 | 2022-04-15 | Accurate phase control switching-on device for inhibiting switching-on inrush current of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220882799.1U CN218161781U (en) | 2022-04-15 | 2022-04-15 | Accurate phase control switching-on device for inhibiting switching-on inrush current of transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218161781U true CN218161781U (en) | 2022-12-27 |
Family
ID=84572262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220882799.1U Active CN218161781U (en) | 2022-04-15 | 2022-04-15 | Accurate phase control switching-on device for inhibiting switching-on inrush current of transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218161781U (en) |
-
2022
- 2022-04-15 CN CN202220882799.1U patent/CN218161781U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107966633B (en) | Method and system for rapidly judging single-phase earth fault line of power distribution network of power supply system | |
| CN100580835C (en) | Breaker synchronous controller and control method thereof | |
| CN102013688B (en) | Synchronous switch for controlling switching of three-phase power capacitor | |
| CN113466653B (en) | Multifunctional thyristor switching switch detection method | |
| CN2800620Y (en) | Intelligent zero-cross opening or closing gate breaker | |
| CN202586308U (en) | Comprehensive grounding protective device for microcomputer | |
| CN102412568B (en) | Method for adjusting line protection motion sequential solution breaker current delay zero crossing | |
| CN212586455U (en) | Electric arc suppression coil controller testing device | |
| CN218161781U (en) | Accurate phase control switching-on device for inhibiting switching-on inrush current of transformer | |
| CN209994095U (en) | Transformer closing inrush current suppression device based on reactor | |
| CN201243195Y (en) | Actuating apparatus for middle/small power industrial frequency three-phase transformer | |
| CN114678832A (en) | Accurate phase control switching-on device for inhibiting switching-on inrush current of transformer | |
| CN106712307B (en) | Dynamic time delay sequential closing system and method for avoiding damage to circuit breaker by bias current | |
| CN113725811B (en) | Single-phase grounding processing method of non-effective grounding system | |
| CN209860601U (en) | Low-voltage reactive compensation fee control device | |
| CN112782439B (en) | Manufacturing method of characteristic current for single-phase earth fault detection in small-current grounding system | |
| CN202737434U (en) | 10kV ultrahigh speed short-circuit current interrupter | |
| CN210468791U (en) | Middle-high voltage device for inhibiting transformer switching-on inrush current based on SCR | |
| CN111751607A (en) | Electric arc suppression coil controller testing device | |
| CN201584672U (en) | Novel power distribution and transformation device | |
| CN219372016U (en) | Excitation surge current suppression system | |
| CN211790731U (en) | 35KV bus zero-sequence overvoltage protection device of 110KV transformer substation | |
| CN210780094U (en) | Ring network controller | |
| Meng et al. | Application of 66kV active intervention grounding arc suppression device | |
| CN216086150U (en) | Control device for preventing earth fault load shedding of 220KV system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |