CN114204532A - Distribution circuit for reducing starting impact current of transformer in radar system - Google Patents
Distribution circuit for reducing starting impact current of transformer in radar system Download PDFInfo
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- CN114204532A CN114204532A CN202111241694.4A CN202111241694A CN114204532A CN 114204532 A CN114204532 A CN 114204532A CN 202111241694 A CN202111241694 A CN 202111241694A CN 114204532 A CN114204532 A CN 114204532A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
Abstract
One embodiment of the invention discloses a distribution circuit for reducing starting impact current of a transformer in a radar system, which comprises a circuit breaker, a first power resistor, a second power resistor, a third power resistor, a first alternating current contactor, a second alternating current contactor, a time delay relay and a power transformer. The power distribution circuit adopts the power resistor to pre-charge the primary winding of the power transformer when being electrified, so that the starting impact current of far excess rated current in the alternating current distribution circuit when the transformer is in magnetic saturation is avoided. After the magnetizing is finished, the AC contactor on the primary side of the transformer is in short circuit with the power resistor, so that the power resistor is prevented from continuously generating power loss after the electric equipment works to cause damage, the AC contactor on the secondary side of the transformer is synchronously switched on, and the electric equipment starts to work. The time delay between the power-up and the action of the AC contactor is determined by a time delay relay. The power distribution circuit provided by the invention avoids the reduction of the reliability of a link for power distribution of the power transformer or the abnormity of the output voltage waveform of the power supply unit when the system is electrified.
Description
Technical Field
The invention relates to the field of radar power supply and distribution. And more particularly to a power distribution circuit for reducing transformer startup inrush current in a radar system.
Background
In a radar system, especially a shipborne radar system, since an alternating current power supply form is not matched with an equipment power utilization form (for example, an output of a shipborne power supply unit is generally a three-phase three-wire system without a neutral line, and power equipment often needs single-phase alternating current power supply), in order to avoid large-scale modification of the power equipment and adapt to a superior power supply system, a power transformer is generally adopted for voltage isolation and transformation.
When the power transformer is electrified, because of the uncertainty of the residual magnetism of the magnetic core and the phase of the alternating current supply voltage, the primary side starting impact current is different when the power transformer is electrified every time, if the power transformer is electrified, the magnetic core is easily saturated when the alternating current input voltage peak value is met and the excitation direction generated by the magnetic core is the same as the residual magnetism of the magnetic core, the equivalent impedance is extremely low after the magnetic core is saturated, great starting current impact can be caused, and the peak value can reach 20-30 times of the rated current. In actual engineering, for avoiding the breaker tripping operation that above-mentioned starting current strikeed to cause this distribution branch road, generally select long time delay circuit breaker or enlarge circuit breaker current capacity, but this kind of mode can cause the decline of circuit breaker protective capability: when the over-current fault occurs to the electric equipment, the electric equipment can not act in time. Meanwhile, the starting current impact value is not reduced in the mode, and the abnormal output voltage waveform of the power supply unit possibly caused by impact current is not improved.
Disclosure of Invention
The invention aims to provide a distribution circuit for reducing the starting impact current of a transformer in a radar system. To solve at least one of the problems of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a power distribution circuit for reducing transformer startup inrush current in a radar system, comprising:
the circuit breaker comprises a circuit breaker, a first power resistor, a second power resistor, a third power resistor, a first alternating current contactor, a second alternating current contactor, a time delay relay and a power transformer;
a first output end of the circuit breaker is connected with a first end of the first power resistor and a first input end of the first alternating current contactor;
the second output end of the circuit breaker is connected with the first end of the second power resistor and the second input end of the first alternating current contactor;
a third output end of the circuit breaker is connected with a first end of the third power resistor and a third input end of the first alternating current contactor;
the first input end of the power transformer is connected with the second end of the first power resistor and the first output end of the first alternating current contactor;
the second input end of the power transformer is connected with the second end of the second power resistor and the second output end of the first alternating current contactor;
a third input end of the power transformer is connected with a second end of the third power resistor and a third output end of the first alternating current contactor;
the first output end of the power transformer is connected with the first input end of the second alternating current contactor;
the second output end of the power transformer is connected with the second input end of the second alternating current contactor;
the third output end of the power transformer is connected with the third input end of the second alternating current contactor;
the fourth output end of the power transformer is connected with electric equipment;
the first output end, the second output end and the third output end of the second alternating current contactor are connected with electric equipment;
the output end of the time delay relay is connected with the fourth input end of the first alternating current contactor and the fourth input end of the second alternating current contactor;
and the fourth output end of the first alternating current contactor and the fourth output end of the second alternating current contactor are connected with a control ground.
In one particular embodiment of the present invention,
the input end of the breaker is connected with the output of the power supply unit or the superior power distribution equipment.
In one particular embodiment of the present invention,
the time delay relay is used for controlling time delay and further controlling the connection of the first alternating current contactor and the second alternating current contactor.
In one particular embodiment of the present invention,
the coil forms of the time delay relay and the alternating current contactor and the power-on requirement of the radar system determine that the input end of the time delay relay receives a power-on signal or alternating current input voltage.
In one particular embodiment of the present invention,
the first power resistor, the second power resistor and the third power resistor are used for limiting the peak value of the primary side starting impact current of the power transformer.
In one particular embodiment of the present invention,
the first power resistor, the second power resistor and the third power resistor are wire-wound resistors.
The invention has the following beneficial effects:
the invention provides a distribution circuit for reducing starting impact current of a transformer in a radar system, which avoids the reduction of the reliability of a link for distributing power for a power transformer or the abnormity of the output voltage waveform of a power supply unit when the system is powered on. The power distribution circuit adopts the power resistor to pre-charge the primary winding of the power transformer when being electrified, so that the starting impact current of far excess rated current in the alternating current distribution circuit when the transformer is in magnetic saturation is avoided. After the magnetizing is finished, the AC contactor on the primary side of the transformer is in short circuit with the power resistor, so that the power resistor is prevented from continuously generating power loss after the electric equipment works to cause damage, the AC contactor on the secondary side of the transformer is synchronously switched on, and the electric equipment starts to work. The power transformer is pre-magnetized when being electrified, so that overlarge starting impact current caused by magnetic saturation is avoided, the reliability of a power distribution link is improved, and the power transformer pre-magnetizing power distribution system is suitable for systems such as radars and the like which adopt the power transformer to realize voltage isolation and transformation.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 illustrates a schematic diagram of a power distribution circuit for reducing transformer startup inrush current in a radar system, according to one embodiment of the present invention.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
As shown in fig. 1, an embodiment of the present invention discloses a power distribution circuit for reducing a start-up inrush current of a transformer in a radar system, including:
the power supply comprises a circuit breaker Q1, a first power resistor R1, a second power resistor R2, a third power resistor R3, a first alternating current contactor K1, a second alternating current contactor K2, a time delay relay K3 and a power transformer T1;
a first output end of the circuit breaker is connected with a first end of the first power resistor and a first input end of the first alternating current contactor;
the second output end of the circuit breaker is connected with the first end of the second power resistor and the second input end of the first alternating current contactor;
a third output end of the circuit breaker is connected with a first end of the third power resistor and a third input end of the first alternating current contactor;
the first input end A of the power transformer is connected with the second end of the first power resistor and the first output end of the first alternating current contactor;
a second input end B of the power transformer is connected with a second end of the second power resistor and a second output end of the first alternating current contactor;
a third input end C of the power transformer is connected with a second end of the third power resistor and a third output end of the first alternating current contactor;
the first output end a of the power transformer is connected with the first input end of the second alternating current contactor;
the second output end b of the power transformer is connected with the second input end of the second alternating current contactor;
a third output end c of the power transformer is connected with a third input end of the second alternating current contactor;
a fourth output end N of the power transformer is connected with electric equipment;
the first output end, the second output end and the third output end of the second alternating current contactor are connected with electric equipment;
the output end of the time delay relay is connected with the fourth input end of the first alternating current contactor and the fourth input end of the second alternating current contactor;
and the fourth output end of the first alternating current contactor and the fourth output end of the second alternating current contactor are connected with a control ground.
The circuit provided by the invention is suitable for a three-phase power transformer, and the single-phase power transformer can also reduce starting impact current in a similar way.
In a specific embodiment, the input end of the circuit breaker is connected with the output end of a power supply unit or superior power distribution equipment.
In a specific embodiment, the delay relay is used for controlling the delay time, and further controlling the connection of the first alternating current contactor and the second alternating current contactor. Specifically, the alternating current contactor K1 is in short circuit with the power resistors R1-R3 after a certain time delay, and excessive power consumption borne by the resistors when the power transformer T1 is in a load state is avoided. The coils of the alternating current contactors K1 and K2 are synchronously controlled by the delay relay K3, so that the phenomenon that the power resistors R1-R3 are damaged due to excessive power consumption caused by the fact that working current of electric equipment flows through the power resistors R1-R3 is strictly avoided in time sequence, and the reliability of the circuit is improved.
In one embodiment, the coil form of the delay relay and ac contactor and the radar system power up requirements determine whether the input of the delay relay receives a power up signal or an ac input voltage. The control signal of the delay relay K3 can be taken from the ac input voltage or the system power-on signal, and is determined by the power supply form of the contactor and the coil of the relay and the system power-on requirement.
In a specific embodiment, the first power resistor, the second power resistor and the third power resistor are used for limiting a primary side starting surge current peak value of the power transformer. The first power resistor, the second power resistor and the third power resistor are wire-wound resistors. Specifically, the power resistors R1-R3 play a role in limiting the peak value of the starting inrush current of the primary side of the power transformer T1, so the design principle of the resistance value is that the peak value of the primary side current is close to the rated current of the transformer under the condition that only the resistor is considered in the primary side impedance, which is convenient for the model selection of the circuit breaker Q1. At the moment of power-on, the power resistors R1-R3 bear larger instantaneous power, the power consumption is basically not borne after the excitation of the transformer is completed, and the repetition frequency of the process is very low, so that the wire-wound resistor is suitable for being selected.
When the system is powered on, the power resistors R1-R3 limit the primary side starting impact current of the power transformer T1, and the current peak value does not exceed the ratio of the alternating current input voltage to the power resistors. Even if the excitation direction of the alternating current input voltage generated on the transformer magnetic core is the same as the residual magnetism of the magnetic core before electrification, so that the magnetic core is saturated, the transformer magnetic core can normally work according to a hysteresis curve after half of an alternating current period at most, and the equivalent impedance of the transformer magnetic core is far larger than the power resistance after the excitation inductance is recovered to be normal. Because the AC contactor K2 on the secondary side of the power transformer T1 is not turned on, the electric equipment does not work, and the transformer does not carry load, the power resistors R1-R3 do not bear power consumption after the magnetic core of the transformer is excited. After a certain delay time (more than the AC cycle), the delay relay controls the AC contactors K1 and K2 to be switched on, and the electric equipment can work normally.
The power distribution circuit provided by the invention is used for reducing the primary side starting impact current of the power transformer in the radar system and avoiding the reduction of the reliability of a link for power distribution of the power transformer or the abnormity of the output voltage waveform of a power supply unit when the system is electrified. The power distribution circuit adopts the power resistors R1-R3 to pre-magnetize the primary winding of the power transformer T1 during electrification, so that the starting impact current of far excess rated current in the alternating current distribution circuit when the transformer is in magnetic saturation is avoided. After the magnetizing is finished, the power resistors R1-R3 are in short circuit connection with the alternating current contactor K1 on the primary side of the transformer, the power resistors are prevented from continuously generating power loss after the electric equipment works to cause damage, the alternating current contactor K2 on the secondary side of the transformer is synchronously switched on, and the electric equipment starts to work. The delay between power-up and ac contactor action is determined by delay relay K3, which is controlled by the ac input voltage or system power-up signal. The power transformer is pre-magnetized when being electrified, so that overlarge starting impact current caused by magnetic saturation is avoided, the reliability of a power distribution link is improved, and the power transformer pre-magnetizing power distribution system is suitable for systems such as radars and the like which adopt the power transformer to realize voltage isolation and transformation.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (6)
1. A power distribution circuit for reducing transformer startup inrush current in a radar system, comprising:
the circuit breaker comprises a circuit breaker, a first power resistor, a second power resistor, a third power resistor, a first alternating current contactor, a second alternating current contactor, a time delay relay and a power transformer;
a first output end of the circuit breaker is connected with a first end of the first power resistor and a first input end of the first alternating current contactor;
the second output end of the circuit breaker is connected with the first end of the second power resistor and the second input end of the first alternating current contactor;
a third output end of the circuit breaker is connected with a first end of the third power resistor and a third input end of the first alternating current contactor;
the first input end of the power transformer is connected with the second end of the first power resistor and the first output end of the first alternating current contactor;
the second input end of the power transformer is connected with the second end of the second power resistor and the second output end of the first alternating current contactor;
a third input end of the power transformer is connected with a second end of the third power resistor and a third output end of the first alternating current contactor;
the first output end of the power transformer is connected with the first input end of the second alternating current contactor;
the second output end of the power transformer is connected with the second input end of the second alternating current contactor;
the third output end of the power transformer is connected with the third input end of the second alternating current contactor;
the fourth output end of the power transformer is connected with electric equipment;
the first output end, the second output end and the third output end of the second alternating current contactor are connected with electric equipment;
the output end of the time delay relay is connected with the fourth input end of the first alternating current contactor and the fourth input end of the second alternating current contactor;
and the fourth output end of the first alternating current contactor and the fourth output end of the second alternating current contactor are connected with a control ground.
2. The electrical distribution circuit of claim 1,
the input end of the breaker is connected with the output of the power supply unit or the superior power distribution equipment.
3. The electrical distribution circuit of claim 1,
the time delay relay is used for controlling time delay and further controlling the connection of the first alternating current contactor and the second alternating current contactor.
4. The electrical distribution circuit of claim 3,
the coil forms of the time delay relay and the alternating current contactor and the power-on requirement of the radar system determine that the input end of the time delay relay receives a power-on signal or alternating current input voltage.
5. The electrical distribution circuit of claim 1,
the first power resistor, the second power resistor and the third power resistor are used for limiting the peak value of the primary side starting impact current of the power transformer.
6. The electrical distribution circuit of claim 1,
the first power resistor, the second power resistor and the third power resistor are wire-wound resistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111241694.4A CN114204532A (en) | 2021-10-25 | 2021-10-25 | Distribution circuit for reducing starting impact current of transformer in radar system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111241694.4A CN114204532A (en) | 2021-10-25 | 2021-10-25 | Distribution circuit for reducing starting impact current of transformer in radar system |
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| CN114204532A true CN114204532A (en) | 2022-03-18 |
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| CN202111241694.4A Pending CN114204532A (en) | 2021-10-25 | 2021-10-25 | Distribution circuit for reducing starting impact current of transformer in radar system |
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Cited By (2)
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| CN115347533A (en) * | 2022-10-18 | 2022-11-15 | 保定市英电电力科技有限公司 | Method for reducing excitation inrush current of large transformer |
| CN115378021A (en) * | 2022-10-25 | 2022-11-22 | 国网经济技术研究院有限公司 | Offshore flexible-straight main wiring system and starting method thereof |
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