CN207283147U - A kind of transformer electromagnetic interference protecting system - Google Patents
A kind of transformer electromagnetic interference protecting system Download PDFInfo
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- CN207283147U CN207283147U CN201721316327.5U CN201721316327U CN207283147U CN 207283147 U CN207283147 U CN 207283147U CN 201721316327 U CN201721316327 U CN 201721316327U CN 207283147 U CN207283147 U CN 207283147U
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Abstract
A kind of transformer electromagnetic interference protecting system, including：The high-pressure side protection equipment for being arranged on high voltage side of transformer and the low-pressure side protection equipment for being arranged on step down side；Wherein described high-pressure side protects equipment to include the high-pressure side electromagnetic running wave blocking inductor for being connected to the high-pressure side arrester between high-tension cable and ground and being connected to high-tension cable and the high voltage side of transformer, and the low-pressure side protection equipment includes the low-pressure side electromagnetic running wave blocking inductor for being connected to the low-pressure side arrester between low-voltage cable and ground and being connected to low-voltage cable and the step down side.The utility model protects equipment and the low-pressure side of step down side to protect equipment by being separately positioned on the high-pressure side of high voltage side of transformer; light current magnetic disturbance can be protected but also protect the strong electromagnetics such as thunder and lightning; and the resistance value of the ground resistance due to the grounded screen that can become larger, grounded screen manufacture and maintenance cost are relatively low.
Description
Technical field
Field transformer is the utility model is related to, more specifically to a kind of transformer electromagnetic interference protecting system.
Background technology
Power transformer is one of equipment of most critical in electric system, and it is one in this area to ensure its normal operation
A very important problem.The source of damage of transformer is very much, and electromagnetic interference is a wherein critically important factor of damage.Electricity
Magnetic disturbance generally includes strong electromagnetic, such as the pulse current that direct stroke, indirect lightning strike, switching overvoltage produce, and
Light current magnetic disturbance, such as oscillating electromagnetic wave, the high-frequency electromagnetic of user equipment generation that high-frequency harmonic, switching manipulation produce disturb.
Existing transformer electromagnetic interference protecting system is normally only in transformer both sides zinc oxide surge arresters and ground connection electricity
Net, so that electromagnetic energy is released to the earth, so as to be protected to transformer.But such transformer electromagnetic interference shielding
System is primarily present following defect.
1. there is response to overvoltage, that is to say, that as long as interference voltage, no more than the startup voltage of arrester, it is protected
Pattern would not act, and the characteristic such as frequency, pulsewidth for electromagnetic interference cannot respond to and protect, and arrester
Starting voltage can all select between 1 to 2 times of working voltage.For example the arrester of 380V working voltages is typically chosen startup electricity
Pressure is all in 620V or so, it can be said that the prior art is no any protective capacities to light current magnetic disturbance.
2nd, the requirement to grounded screen is very high, generally requires the ground resistance of grounded screen to be less than 10 Ω, and such ground connection
The manufacture cost and maintenance cost of resistance are all very high.
Utility model content
The technical problems to be solved in the utility model is, for the drawbacks described above of the prior art, there is provided one kind can prevent
Shield light current magnetic disturbance can protect the strong electromagnetics such as thunder and lightning again, and grounded screen manufactures the transformer electromagnetism low with maintenance cost and does
Disturb guard system.
Technical solution is used by the utility model solves its technical problem：Construct a kind of transformer electromagnetic interference shielding
System, including：The high-pressure side protection equipment for being arranged on high voltage side of transformer and the low-pressure side for being arranged on step down side are protected
Protect equipment；Wherein described high-pressure side protection equipment includes high-pressure side arrester and the connection being connected between high-tension cable and ground
Inductor is blocked in the high-pressure side electromagnetic running wave of high-tension cable and the high voltage side of transformer, the low-pressure side protection equipment includes
The low-pressure side arrester that is connected between low-voltage cable and ground and it is connected to the low of low-voltage cable and the step down side
Side electromagnetic running wave is pressed to block inductor, wherein high-pressure side electromagnetic running wave blocking inductor is including differential mode inductors and/or altogether
Mould inductor, the low-pressure side electromagnetic running wave block inductor to include differential mode inductors and/or common-mode inductor.
In transformer electromagnetic interference protecting system described in the utility model, the differential mode inductors include high frequency magnetic core
And coil；The common-mode inductor includes at least two co-mode coils and the high-frequency magnetic being arranged between the co-mode coil.
In transformer electromagnetic interference protecting system described in the utility model, the transformer is single-phase transformer, institute
It is poor including the first high-pressure side arrester, the second high-pressure side arrester, the first differential mode inductors and second to state high-pressure side protection equipment
Mould inductor, first high-pressure side arrester are connected between first end and the ground of the high-tension cable, second high pressure
Side arrester is connected between second end and the ground of the high-tension cable, and first differential mode inductors are connected to the high-voltage electricity
Between the first end of the high voltage side of transformer of the first end of cable and the single-phase transformer, second differential mode inductors are connected to
Between the second end of the high voltage side of transformer of the second end of the high-tension cable and the single-phase transformer.
In transformer electromagnetic interference protecting system described in the utility model, the low-pressure side protection equipment includes the 3rd
Differential mode inductors, the 4th differential mode inductors and the first low-pressure side arrester, the first end connection institute of the 3rd differential mode inductors
First end, the first end of the second end connection low-voltage cable of the step down side of single-phase transformer are stated, the described 4th is poor
The first end of mould inductor connects the second end of the step down side of the single-phase transformer, second end connects the low tension
The second end of cable, the first low-pressure side arrester are connected between first end and the ground of the low-voltage cable.
In transformer electromagnetic interference protecting system described in the utility model, the low-pressure side protection equipment is further wrapped
The first co-mode coil, the second co-mode coil and the first high-frequency magnetic are included, first co-mode coil is connected to the 3rd differential mode
Between the second end of inductor and the first end of the low-voltage cable, second co-mode coil is connected to the 4th differential mode electricity
Between the second end of sensor and the second end of the low-voltage cable, first high-frequency magnetic is arranged on first co-mode coil
Between second co-mode coil.
In transformer electromagnetic interference protecting system described in the utility model, further comprise that the second low-pressure side is taken shelter from the thunder
Device, the second low-pressure side arrester are connected between second end and the ground of the low-voltage cable；The change of the single-phase transformer
The earthing of casing of the on high-tension side second end of depressor and the single-phase transformer.
In transformer electromagnetic interference protecting system described in the utility model, the transformer is three-phase transformer, institute
Stating high-pressure side protection equipment includes the first high-pressure side arrester, the second high-pressure side arrester, the 3rd high-pressure side arrester, first poor
Mould inductor, the second differential mode inductors and the 3rd differential mode inductors, first high-pressure side arrester are connected to the high-voltage electricity
Between the first end and ground of cable, second high-pressure side arrester is connected between second end and the ground of the high-tension cable, institute
State the 3rd high-pressure side arrester to be connected between the 3rd end of the high-tension cable and ground, first differential mode inductors are connected to
Between first phase of the high voltage side of transformer of the first end of the high-tension cable and the three-phase transformer, the second differential mode electricity
Sensor is connected between the second end of the high-tension cable and the second phase of the high voltage side of transformer of the three-phase transformer；It is described
3rd differential mode inductors are connected to the 3rd of the 3rd end of the high-tension cable and the high voltage side of transformer of the three-phase transformer
Between phase.
In transformer electromagnetic interference protecting system described in the utility model, the low-pressure side protection equipment includes the 4th
Differential mode inductors, the 5th differential mode inductors, the 6th differential mode inductors, the 7th differential mode inductors, the first low-pressure side arrester, second
Low-pressure side arrester and the 3rd low-pressure side arrester, the first end of the 4th differential mode inductors connect the three-phase transformer
The first phase, the first end of the second end connection low-voltage cable of step down side, the first of the 5th differential mode inductors
End connects the second phase of the step down side of the three-phase transformer, second end connects the second end of the low-voltage cable, institute
State third phase, the second end connection institute of the step down side of the first end connection three-phase transformer of the 6th differential mode inductors
The 3rd end of low-voltage cable is stated, the first end of the 7th differential mode inductors connects the step down side of the three-phase transformer
Zero curve phase, second end connect the 4th end of the low-voltage cable, the first low-pressure side arrester is connected to the low tension
Between the first end and ground of cable, the second low-pressure side arrester is connected between second end and the ground of the low-voltage cable, institute
State the 3rd low-pressure side arrester to be connected between the 3rd end of the low-voltage cable and ground, the 4th termination of the low-voltage cable
Ground.
In transformer electromagnetic interference protecting system described in the utility model, the low-pressure side protection equipment is further wrapped
Include the first co-mode coil, the second co-mode coil, the 3rd co-mode coil, the 4th co-mode coil, the first high-frequency magnetic, the second high frequency magnetic
Ring and the 3rd high-frequency magnetic, first co-mode coil are connected to the first end of the 4th differential mode inductors and the low tension
Between the first end of cable, second co-mode coil is connected to the second end of the 5th differential mode inductors and the low-voltage cable
Second end between, the 3rd co-mode coil is connected to the second end of the 6th differential mode inductors and the low-voltage cable
Between 3rd end, the 4th co-mode coil be connected to the 7th differential mode inductors second end and the low-voltage cable
Between four ends, first high-frequency magnetic is arranged between first co-mode coil and second co-mode coil, and described
Two high-frequency magnetics are arranged between second co-mode coil and the 3rd co-mode coil, and the 3rd high-frequency magnetic is arranged on
Between 3rd co-mode coil and the 4th co-mode coil.
In transformer electromagnetic interference protecting system described in the utility model, the earthing of casing of the three-phase transformer.
Implement the transformer electromagnetic interference protecting system of the utility model, by the height for being separately positioned on high voltage side of transformer
Side protection equipment and the low-pressure side protection equipment of step down side are pressed, light current magnetic disturbance can be protected but also protect thunder and lightning etc.
Strong electromagnetic, and the resistance value of the ground resistance due to the grounded screen that can become larger, grounded screen manufacture and maintenance cost
It is relatively low.Further, as a result of common-mode inductor, therefore there can be more efficient impedance to avoid suppression common mode electromagnetic interference
Filtration result.
Brief description of the drawings
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing：
Fig. 1 is the functional block diagram of the first embodiment of the transformer electromagnetic interference protecting system of the utility model；
Fig. 2 is the circuit diagram of the second embodiment of the transformer electromagnetic interference protecting system of the utility model；
Fig. 3 is the circuit diagram of the 3rd embodiment of the transformer electromagnetic interference protecting system of the utility model；
Fig. 4 is the circuit diagram of the fourth embodiment of the transformer electromagnetic interference protecting system of the utility model.
Embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, is further elaborated the utility model.It should be appreciated that specific embodiment described herein is only explaining
The utility model, is not used to limit the utility model.
As shown in Figure 1, the transformer electromagnetic interference protecting system of the utility model, including it is arranged on the change of transformer 200
The on high-tension side high-pressure side protection equipment 100 of depressor and the low-pressure side protection equipment 300 for being arranged on step down side.The height
Protection equipment 100 in pressure side includes being connected to the high-pressure side arrester 110 between high-tension cable and ground and being connected to high-tension cable
Inductor 120 is blocked with the high-pressure side electromagnetic running wave of the high voltage side of transformer.The low-pressure side protection equipment 300 includes connection
Low-pressure side arrester 310 between low-voltage cable and ground and the low pressure for being connected to low-voltage cable and the step down side
Side electromagnetic running wave blocks inductor 320.
In the utility model, high-pressure side arrester 110 and low-pressure side arrester 310 can be between varistor, discharge tubes
Gap arrester, Zinc-Oxide Arrester, ceramic discharge tube, Transient Suppression Diode, semiconductor discharge tube etc. device or its is various
Combination.In the utility model, the transformer 200 can be various transformer equipments, such as single-phase transformer, three phase-change pressures
Device, 50HZ transformers, 60HZ transformers, 400Hz transformers, high frequency transformer, isolating transformer, voltage regulating transformer etc.
Deng.
In a preferred embodiment of the utility model, the high-pressure side electromagnetic running wave blocks inductor 120 and described
It can be identical that low-pressure side electromagnetic running wave, which blocks inductor 320, be formed by differential mode inductors.In another of the utility model
In preferred embodiment, the high-pressure side electromagnetic running wave blocks inductor 120 and the low-pressure side electromagnetic running wave to block inductor 320
It can be identical, be formed by the differential mode inductors and common-mode inductor of series connection.In the further embodiment of the utility model
In, it can be phase that the high-pressure side electromagnetic running wave, which blocks inductor 120 and low-pressure side electromagnetic running wave blocking inductor 320,
Together, formed by common-mode inductor.In the further embodiment of the utility model, the high-pressure side electromagnetic running wave blocks electricity
It can differ that sensor 120 and the low-pressure side electromagnetic running wave, which block inductor 320, and wherein the high-pressure side electromagnetic running wave blocks
Inductor 120 is made of differential mode inductors, and the low-pressure side electromagnetic running wave blocks inductor 320 by the differential mode inductors connected
Formed with common-mode inductor, vice versa.
Since the high-pressure side electromagnetic running wave blocks inductor 120 to be connected to transformer together with high-pressure side arrester 110
Between high-pressure side and ground, and the low-pressure side electromagnetic running wave blocks inductor 320 and the low-pressure side arrester 310 to connect together
Still transmitted to the electromagnetic interference traveling wave between step down side and ground, either transmitted from low-voltage cable from high-tension cable
Electromagnetic interference traveling wave, strong electromagnetic traveling wave therein is discharged into the earth through arrester, and light current magnetic disturbance traveling wave passes through high pressure
Side electromagnetic running wave blocks inductor 120 and the low-pressure side electromagnetic running wave to block inductor 320 to reduce or change and reduce to becoming
The impact of depressor.And strong electromagnetic can only be discharged into the earth by arrester at this time, thus it is larger also not even if ground resistance
It can influence energy release.
Implement the transformer electromagnetic interference protecting system of the utility model, by the height for being separately positioned on high voltage side of transformer
Side protection equipment and the low-pressure side protection equipment of step down side are pressed, light current magnetic disturbance can be protected but also protect thunder and lightning etc.
Strong electromagnetic, and the resistance value of the ground resistance due to the grounded screen that can become larger, grounded screen manufacture and maintenance cost
It is relatively low.
Fig. 2 is the circuit diagram of the second embodiment of the transformer electromagnetic interference protecting system of the utility model.Fig. 2 with
The form of single-phase transformer is described as follows the transformer electromagnetic interference protecting system of the utility model.As shown in Fig. 2, this practicality
New transformer electromagnetic interference protecting system includes being arranged on the high-pressure side protection of the high voltage side of transformer of single-phase transformer 210
Equipment 100 and the low-pressure side protection equipment 300 for being arranged on step down side.
In the present embodiment, the high-pressure side protection equipment 100 includes the first end and transformer for being connected to high-tension cable
Differential mode inductors 121 between on high-tension side first end, the arrester 111 being connected between the first end of high-tension cable and ground,
It is connected to differential mode inductors 122 between the second end of high-tension cable and the second end of high voltage side of transformer and is connected to high-voltage electricity
Arrester 112 between the second end and ground of cable.In the preferred embodiment of the utility model, 121 He of differential mode inductors
Differential mode inductors 122 can be made of high frequency magnetic core and coil, formed the high-pressure side electromagnetic running wave shown in Fig. 1 and blocked inductor
120。
In the present embodiment, low-pressure side protection equipment 300 include common-mode inductor 321 and differential mode inductors 322,
The 323 low-pressure side electromagnetic running waves formed block inductor 320, and arrester 311,312.As shown in Fig. 2, common-mode inductor
321 include co-mode coil 3211,3212 and high-frequency magnetic 3212.The first end of differential mode inductors 322 connects the single-phase change
First end, the first end of second end connection co-mode coil 3211 of the step down side of depressor 210, the co-mode coil 3211
Second end connection low-voltage cable first end.The first end of differential mode inductors 323 connects the transformation of the single-phase transformer 210
Second end, the first end of second end connection co-mode coil 3213 of device low-pressure side, the second end connection of the co-mode coil 3213
The second end of low-voltage cable.High-frequency magnetic 3212 is arranged between co-mode coil 3211 and co-mode coil 3213.Arrester 311 connects
It is connected between the first end of the low-voltage cable and ground and the arrester 312 is connected to the second end and ground of the low-voltage cable
Between., can be by the earthing of casing of the transformer 210 in the preferred embodiment of the utility model.In the utility model
In further preferred embodiment, the second end of the low-voltage cable can also be grounded.
The principle of the present embodiment is described as follows below based on Fig. 2：
Whether the strong electromagnetic of thunder and lightning etc or light current magnetic disturbance are all with electromagnetic running wave on cable conductor
Mode is transmitted, electromagnetic running wave can prolong transformer high voltage cable or type low-voltage cable from being distally transmitted to transformer, it might even be possible to
Transmitted at the same time from high and low pressure side to transformer.
The electromagnetic interference traveling wave transmitted from certain high voltage cable, can first pass around " high-pressure side protection equipment ".Such as
Fruit electromagnetic interference traveling wave is strong electromagnetic, and the differential mode inductors meeting impedance connected at this moment high-pressure side protection equipment is flowed through in it
The change of portion's electric current, the effect brought are the voltage of rapid lifting high pressure side inlet.At this moment the arrester of entrance can be rapidly reached
Its startup voltage simultaneously turns on rapidly, and interference electromagnetic wave energy is released to the earth.If electromagnetic interference traveling wave is done for light current magnetic
Disturb, do not reach the startup voltage of arrester, then differential mode inductors can play inductance filter, reduce the slope of interference waveform
And part energy is changed into thermal dissipation, so as to reduce impact of the electromagnetic interference to transformer.
The electromagnetic interference traveling wave transmitted from certain type low-voltage cable, can first pass around low-pressure side protection equipment.Electromagnetism
Interference traveling wave is strong electromagnetic, and the low-pressure side electromagnetic running wave connected at this moment low-pressure side protection equipment blocks inductor meeting
The change of its internal current is flowed through in impedance, and the effect brought is the voltage of rapid lifting low pressure side inlet.At this moment low pressure side inlet
Arrester can be rapidly reached its startup voltage and turn on rapidly, will interference electromagnetic wave energy be released to the earth.If electromagnetism
Interference traveling wave is light current magnetic disturbance, does not reach the startup voltage of arrester, then differential mode inductors can play inductance filter,
Reduce the slope of interference waveform and part energy is changed into thermal dissipation, transformer is rushed so as to reduce electromagnetic interference
Hit.
Why existing guard technology wishes that the ground resistance of grounded screen is the smaller the better, when being because of arrester conducting, electricity
Magnetic disturbance energy can be divided into 2 parallel shunt branches in arrester front end, flow to inside transformer, another way flow direction ground connection all the way
Resistance.So ground resistance is smaller, flow to that the current energy of the earth is more, the protection to transformer is better, ground resistance
Play the role of adjusting interfering energy current drain ratio.And apply the transformer electromagnetic interference protecting system of the utility model
Afterwards, the energy of electromagnetic interference has been also divided into 2 parallel shunt branches when arrester turns on, but flows to a branch of transformer
It is blocked, lightning current only has a Zhi Luxiang the earth to release, and ground resistance at this time no longer takes on adjusting current drain ratio
Effect, even if ground resistance becomes larger it is also ensured that interfering energy is completely to greatly releasing.Therefore, it is new using this practicality
After the system of type can appropriate amplifying transformer earth mat grounding resistance, without influencing its protective capacities.
Further, due to common-mode inductor of connecting in protecting equipment in low-pressure side, it is for each cable of low-pressure side
On, while suppression common mode electromagnetic interference similar in the direction formed objects being propagated through, there is more efficient impedance filtration result.
In other preferred embodiments of the utility model, the high-pressure side electromagnetic running wave blocks inductor to include
The common-mode inductor connected with differential mode inductors, its set-up mode may be referred to low-pressure side electromagnetic running wave and block inductor.And
In the simplified embodiment of one of the utility model, the high-pressure side electromagnetic running wave blocks inductor and the low-pressure side electromagnetic running wave
Inductor is blocked to only include differential mode inductors.Teaching based on the utility model, those skilled in the art know how
Carry out above-mentioned setting.
In the utility model, arrester 311,312,111,112 can be with varistor, electric discharge ligament arrester, oxygen
Change zinc arrester, ceramic discharge tube, Transient Suppression Diode, semiconductor discharge tube etc. device or its various combination.
In the utility model, in addition to single-phase transformer, the transformer electromagnetic interference protecting system can be applied to
Various transformer equipments, for example, three-phase transformer, 50HZ transformers, 60HZ transformers, 400Hz transformers, high frequency transformer, every
From transformer, voltage regulating transformer etc..
Those skilled in the art know, in the simplification embodiment of the utility model, it is convenient to omit low-pressure side protects equipment
In common-mode inductor 321 so that the same referring to high-pressure side protective device, directly differential mode inductors 322,323 are connected respectively
To step down side first end and low-voltage cable first end between, and the second end and low tension of step down side
Between the second end of cable.
Fig. 3 is the circuit diagram of the 3rd embodiment of the transformer electromagnetic interference protecting system of the utility model.It sets
Meter is essentially identical with embodiment illustrated in fig. 2, it differs only in the design of low-pressure side protection equipment mesolow side arrester.Such as figure
Low-pressure side arrester shown in 3 includes one end connection transformer of varistor 313 and discharge tube 314, wherein varistor 313
The first end of low-pressure side, the other end are grounded through discharge tube 314.And the second end of step down side and single-phase transformer 210
Shell is equally grounded.
Fig. 4 is the circuit diagram of the fourth embodiment of the transformer electromagnetic interference protecting system of the utility model.Fig. 4 with
The transformer electromagnetic interference protecting system of the utility model is illustrated exemplified by three-phase transformer.As shown in figure 4, this practicality is new
The high-pressure side protection that the transformer electromagnetic interference protecting system of type includes being arranged on the high voltage side of transformer of three-phase transformer 220 is set
Standby 100 and it is arranged on the low-pressure side protection equipment 300 of step down side.
In the present embodiment, the high-pressure side protection equipment 100 includes the first end and transformer for being connected to high-tension cable
Differential mode inductors 121 between on high-tension side first phase, the arrester 111 being connected between the first end of high-tension cable and ground,
It is connected to differential mode inductors 122 between the second end of high-tension cable and the second phase of high voltage side of transformer and is connected to high-voltage electricity
Arrester 112 between the second end and ground of cable, be connected to high-tension cable the 3rd end and high voltage side of transformer the second phase it
Between differential mode inductors 123 and the arrester 113 that is connected between the second end of high-tension cable and ground.In the excellent of the utility model
Select in embodiment, the differential mode inductors 121,122 and 123 can be made of high frequency magnetic core and coil, it is formed shown in Fig. 1
High-pressure side electromagnetic running wave blocks inductor 120.
In the present embodiment, low-pressure side protection equipment 300 include common-mode inductor 326 and differential mode inductors 322,
323rd, the 324 and 325 low-pressure side electromagnetic running waves formed block inductor 320, and three groups of arresters.As shown in figure 4, common mode is electric
Sensor 326 includes four co-mode coils 3262 and three high-frequency magnetics 3261.Described in the first end connection of differential mode inductors 322
The first phase, the second end of the step down side of three-phase transformer 220 connect the first end of the first co-mode coil 3262, described common
The first end of the second end connection low-voltage cable of loft circle 3262.The first end of differential mode inductors 323 connects three phase-change pressure
The second phase, the second end of the step down side of device 220 connect the first end of the second co-mode coil 3262, the co-mode coil
The second end of 3262 second end connection low-voltage cable.The first end of differential mode inductors 324 connects the three-phase transformer 220
The third phase of step down side, second end connect the first end of the 3rd co-mode coil 3262, and the of the co-mode coil 3262
Two ends connect the 3rd end of low-voltage cable.The transformer that the first end of differential mode inductors 325 connects the three-phase transformer 220 is low
The zero curve phase of side, second end is pressed to connect the first end of the 4th co-mode coil 3262, the second end connection of the co-mode coil 3262
4th end of low-voltage cable.As shown in figure 4, the shell of three-phase transformer 220 is grounded together with the 4th end of low-voltage cable.
In other preferred embodiments of the utility model, the high-pressure side electromagnetic running wave blocks inductor to include
The common-mode inductor connected with differential mode inductors, its set-up mode may be referred to low-pressure side electromagnetic running wave and block inductor.And
In the simplified embodiment of one of the utility model, the high-pressure side electromagnetic running wave blocks inductor and the low-pressure side electromagnetic running wave
Inductor is blocked to only include differential mode inductors.Teaching based on the utility model, those skilled in the art know how
Carry out above-mentioned setting.
Further as shown in figure 4, in the present embodiment, three groups of arresters are respectively by varistor 3121 and discharge tube 3122
Composition.One group of varistor 3121 and discharge tube 3122 are connected between the first end of low-voltage cable and ground after connecting.One group of pressure
It is connected to after quick resistance 3121 and discharge tube 3122 series connection between the second end of low-voltage cable and ground.One group of 3121 He of varistor
Discharge tube 3122 is connected between the 3rd end of low-voltage cable and ground after connecting.Certainly other in the utility model are preferable to carry out
In example, other kinds of arrester can also be used to set.
Implement the transformer electromagnetic interference protecting system of the utility model, by the height for being separately positioned on high voltage side of transformer
Side protection equipment and the low-pressure side protection equipment of step down side are pressed, light current magnetic disturbance can be protected but also protect thunder and lightning etc.
Strong electromagnetic, and the resistance value of the ground resistance due to the grounded screen that can become larger, grounded screen manufacture and maintenance cost
It is relatively low.Further, as a result of common-mode inductor, therefore there can be more efficient impedance to avoid suppression common mode electromagnetic interference
Filtration result.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (10)
- A kind of 1. transformer electromagnetic interference protecting system, it is characterised in that including：The high-pressure side for being arranged on high voltage side of transformer is protected Shield equipment and the low-pressure side protection equipment for being arranged on step down side；Wherein described high-pressure side protection equipment includes being connected to High-pressure side arrester between high-tension cable and ground and the high-pressure side electricity for being connected to high-tension cable and the high voltage side of transformer Magnetic traveling wave blocks inductor, low-pressure side protection equipment include the low-pressure side arrester that is connected between low-voltage cable and ground with And the low-pressure side electromagnetic running wave blocking inductor of low-voltage cable and the step down side is connected to, wherein the high-pressure side is electric Magnetic traveling wave blocks inductor to include differential mode inductors and/or common-mode inductor, and the low-pressure side electromagnetic running wave blocks inductor bag Include differential mode inductors and/or common-mode inductor.
- 2. transformer electromagnetic interference protecting system according to claim 1, it is characterised in that the differential mode inductors include High frequency magnetic core and coil；The common-mode inductor includes at least two co-mode coils and the height being arranged between the co-mode coil Frequency magnet ring.
- 3. transformer electromagnetic interference protecting system according to claim 2, it is characterised in that the transformer is single-phase change Depressor, high-pressure side protection equipment include the first high-pressure side arrester, the second high-pressure side arrester, the first differential mode inductors and Second differential mode inductors, first high-pressure side arrester are connected between first end and the ground of the high-tension cable, and described Two high-pressure side arresters are connected between second end and the ground of the high-tension cable, and first differential mode inductors are connected to described Between the first end of the high voltage side of transformer of the first end of high-tension cable and the single-phase transformer, second differential mode inductors It is connected between the second end of the high-tension cable and the second end of the high voltage side of transformer of the single-phase transformer.
- 4. transformer electromagnetic interference protecting system according to claim 3, it is characterised in that the low-pressure side protects equipment Including the 3rd differential mode inductors, the 4th differential mode inductors and the first low-pressure side arrester, the first of the 3rd differential mode inductors End connects the first end of the step down side of the single-phase transformer, second end connects the first end of the low-voltage cable, institute Second end, the second end for the step down side that the first end for stating the 4th differential mode inductors connects the single-phase transformer connect institute The second end of low-voltage cable is stated, the first low-pressure side arrester is connected between first end and the ground of the low-voltage cable.
- 5. transformer electromagnetic interference protecting system according to claim 4, it is characterised in that the low-pressure side protects equipment Further comprise the first co-mode coil, the second co-mode coil and the first high-frequency magnetic, first co-mode coil is connected to described Between the second end of 3rd differential mode inductors and the first end of the low-voltage cable, second co-mode coil is connected to described Between the second end of four differential mode inductors and the second end of the low-voltage cable, first high-frequency magnetic is arranged on described first Between co-mode coil and second co-mode coil.
- 6. transformer electromagnetic interference protecting system according to claim 5, it is characterised in that further comprise the second low pressure Side arrester, the second low-pressure side arrester are connected between second end and the ground of the low-voltage cable；The single-phase transformation The earthing of casing of the second end of the high voltage side of transformer of device and the single-phase transformer.
- 7. transformer electromagnetic interference protecting system according to claim 2, it is characterised in that the transformer is three phase transformations Depressor, the high-pressure side protection equipment are taken shelter from the thunder including the first high-pressure side arrester, the second high-pressure side arrester, the 3rd high-pressure side Device, the first differential mode inductors, the second differential mode inductors and the 3rd differential mode inductors, first high-pressure side arrester are connected to institute State between the first end of high-tension cable and ground, second high-pressure side arrester is connected to the second end and ground of the high-tension cable Between, the 3rd high-pressure side arrester is connected between the 3rd end of the high-tension cable and ground, first differential mode inductance Device is connected between the first end of the high-tension cable and the first phase of the high voltage side of transformer of the three-phase transformer, and described Two differential mode inductors are connected to the second end of the high-tension cable and the second phase of the high voltage side of transformer of the three-phase transformer Between；3rd differential mode inductors are connected to the 3rd end and the transformer high-voltage of the three-phase transformer of the high-tension cable Between the third phase of side.
- 8. transformer electromagnetic interference protecting system according to claim 7, it is characterised in that the low-pressure side protects equipment Kept away including the 4th differential mode inductors, the 5th differential mode inductors, the 6th differential mode inductors, the 7th differential mode inductors, the first low-pressure side Thunder device, the second low-pressure side arrester and the 3rd low-pressure side arrester, the first end connection described three of the 4th differential mode inductors The first phase, the second end of the step down side of phase transformer connect the first end of the low-voltage cable, the 5th differential mode electricity The first end of sensor connects the second phase of the step down side of the three-phase transformer, second end connects the low-voltage cable Second end, the first ends of the 6th differential mode inductors connect the third phase of the step down side of the three-phase transformer, the Two ends connect the 3rd end of the low-voltage cable, and the first end of the 7th differential mode inductors connects the change of the three-phase transformer Zero curve phase, the second end of depressor low-pressure side connect the 4th end of the low-voltage cable, and the first low-pressure side arrester is connected to Between the first end and ground of the low-voltage cable, the second low-pressure side arrester be connected to the low-voltage cable second end and Between ground, the 3rd low-pressure side arrester is connected between the 3rd end of the low-voltage cable and ground, the low-voltage cable 4th end is grounded.
- 9. transformer electromagnetic interference protecting system according to claim 8, it is characterised in that the low-pressure side protects equipment Further comprise the first co-mode coil, the second co-mode coil, the 3rd co-mode coil, the 4th co-mode coil, the first high-frequency magnetic, Two high-frequency magnetics and the 3rd high-frequency magnetic, first co-mode coil are connected to first end and the institute of the 4th differential mode inductors Between the first end for stating low-voltage cable, second co-mode coil is connected to the second end of the 5th differential mode inductors and described Between the second end of low-voltage cable, the 3rd co-mode coil is connected to the second end of the 6th differential mode inductors and described low Between 3rd end of voltage cable, the 4th co-mode coil is connected to the second end of the 7th differential mode inductors and the low pressure Between 4th end of cable, first high-frequency magnetic be arranged on first co-mode coil and second co-mode coil it Between, second high-frequency magnetic is arranged between second co-mode coil and the 3rd co-mode coil, the 3rd high frequency Magnet ring is arranged between the 3rd co-mode coil and the 4th co-mode coil.
- 10. transformer electromagnetic interference protecting system according to claim 9, it is characterised in that the three-phase transformer The earthing of casing.
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| CN201721316327.5U CN207283147U (en) | 2017-10-12 | 2017-10-12 | A kind of transformer electromagnetic interference protecting system |
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| CN201721316327.5U CN207283147U (en) | 2017-10-12 | 2017-10-12 | A kind of transformer electromagnetic interference protecting system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879628A (en) * | 2018-06-25 | 2018-11-23 | 广西电网有限责任公司电力科学研究院 | A kind of distribution transformer lightning protection mode of connection based on inductance filter |
| CN115534683A (en) * | 2022-10-28 | 2022-12-30 | 四川优力源电子科技有限公司 | Novel power supply system of work dormitory van |
-
2017
- 2017-10-12 CN CN201721316327.5U patent/CN207283147U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108879628A (en) * | 2018-06-25 | 2018-11-23 | 广西电网有限责任公司电力科学研究院 | A kind of distribution transformer lightning protection mode of connection based on inductance filter |
| CN115534683A (en) * | 2022-10-28 | 2022-12-30 | 四川优力源电子科技有限公司 | Novel power supply system of work dormitory van |
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