CN103840567A - Device and method for obtaining electric energy through current transformer made of composite magnetic core materials - Google Patents
Device and method for obtaining electric energy through current transformer made of composite magnetic core materials Download PDFInfo
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- CN103840567A CN103840567A CN201410101138.0A CN201410101138A CN103840567A CN 103840567 A CN103840567 A CN 103840567A CN 201410101138 A CN201410101138 A CN 201410101138A CN 103840567 A CN103840567 A CN 103840567A
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- current transformer
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- composite cores
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Abstract
The invention discloses a device and method for obtaining the electric energy through a current transformer made of composite magnetic core materials. The device for obtaining the electric energy comprises the designed current transformer and an electric power obtaining circuit of the current transformer, wherein the device for obtaining the electric energy has good characteristics when a high-voltage or middle-voltage or low-voltage cable is in a small-current state and in a large-current state. When the current of an electric transmission line is small, an exciting electrical inductor of the current transformer is in resonance with an externally-arranged capacitor and the output power is improved; when the current of the electric transmission line is large, a small part of magnetic core materials of the current transformer are in a magnetism saturation condition, the function of voltage stabilization output is achieved, the overall loss of the device is prohibited, and heat-emission of a transformer body is greatly reduced. A periphery circuit of the device for obtaining the electric energy is quite simple, the electric supply stability is high, and the wide application value and the wide market prospect are achieved.
Description
Technical field
The invention belongs to electrical technology field, adopt the current transformer of composite cores material, respond to the device and the circuit that obtain electric energy by transmission line, particularly suitable ultra-high-tension power transmission line watch-dog provides power supply.
Background technology
High-tension cable is the chief component of China's electric power rack, its operation conditions is carried out to on-line monitoring and become the important step that improves electric network reliability, but the power supply of watch-dog that these are placed in to transmission line periphery is very inconvenient, as do not provided 220V electric main in the wild or underground, and adopt photovoltaic battery panel or battery-driven stability and non-maintaining property poor.Only having employing current transformer is directly a kind of safer supply power mode of stablizing, can be for a long time non-maintaining from ultra-high-tension power transmission line power taking by electromagnetic induction.But the current fluctuation of ultra-high-tension power transmission line is very large, traditional current transformer electricity getting device, at transmission line electric current hour, can not obtain enough output voltages and power from transmission line, is difficult to maintain the normal power supply to watch-dog; In the time that transmission line electric current is larger, the magnetic core of conventional current instrument transformer will enter saturation condition, cause magnetic core heating, affect the life-span of cable insulation.Therefore, solve power-supply circuit and under little current situation, export appropriate power, under large current conditions, meet in load request situation, two problems of not heating of instrument transformer person, become the key that electricity getting device designs.
The Chinese invention patent of the patent No. 200910045470.9, a kind of power acquisition device of high-voltage power transmission line based on current transformer is disclosed, as shown in Figure 1, the output of current transformer (1) obtains the direct voltage into load supplying to its circuit theory diagrams after diode rectification filter unit (2).If passing the angular frequency of the transmission line alternating current of current transformer is ω
0, effective value is
i s; The secondary number of turn of current transformer is
n, secondary magnetizing inductance is
l m; Load is that resistance equals
r lresistance.The VD that this electricity getting device obtains
u odetermined by the parameter of above-mentioned transmission line, electricity getting device, load etc. completely, can not manual control.With
r lincrease,
u oalso increase gradually,
r lwhen=∞, this electricity getting device obtains the highest VD
?
i shour, even
u omalso less.Now do not changing the current transformer secondary number of turn
ncondition under, for obtaining enough large output voltage and power by this electricity getting device, can only adopt the magnetizing inductance of increase current transformer
l mmethod; That is this electricity getting device must coordinate the current transformer of large magnetizing inductance, large volume to use, could in the time of the little electric current of input, obtain enough output voltages and power, bring the increase of current transformer cost and the inconvenience of installation.In the time that transmission line electric current is large, output voltage and power that this electricity getting device obtains are excessive, and this patent is added energy leadage circuit the power in excess of acquisition is consumed by bleeder resistance, causes the waste of energy.
For increasing instrument transformer output impedance, the Chinese invention patent of the patent No. 201310206669.1, a kind of DC source based on the power taking of current transformer resonance is disclosed, as shown in Figure 2, it adopts the method for parallel connection outside electric capacity, make parallel connection outside electric capacity and instrument transformer inductance resonance, to reach the effect of increasing device output impedance.But the voltage stabilizing control method more complicated of the method under large current conditions, easily produces out-of-control phenomenon.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of device that adopts the current transformer of composite cores material to obtain electric energy, comprise current transformer, resonant capacitance C
r, rectification filtering unit, load R
l.Current transformer adopts composite cores material, and at transmission line electric current hour, this electricity getting device has very high power taking efficiency; When transmission line electric current is larger, this electricity getting device, in stable output voltage, is avoided current transformer heating.
To achieve these goals, the present invention adopts following technical scheme.
Adopt the current transformer of composite cores material to obtain a device for electric energy, comprise current transformer, resonant capacitance C
r, rectification filtering unit, load R
l, current transformer (1) and resonant capacitance (C
r), rectification filtering unit (2), load (R
l) connect; Current transformer adopts composite cores material, and current transformer is for obtaining through the induced current on the cable of its magnetic core; Current transformer secondary magnetizing inductance value L
mwith C
rmeet condition of resonance,
, its
ffor instrument transformer primary current frequency.
Preferably, described current transformer is enclosed within on ultra-high-tension power transmission line, and transmission line alternating current passes current transformer core, and produces induced current on its secondary winding.
In above-mentioned arbitrary technical scheme preferably, the secondary winding of described current transformer (1) and resonant capacitance C
rparallel connection, and receive the input of rectification filtering unit, the output termination load R of rectification filtering unit
l, for the alternation induction electric energy producing on the secondary winding of current transformer is converted to direct current energy.
In above-mentioned arbitrary technical scheme, preferably, described rectification filtering unit comprises the first diode, the second diode, the 3rd diode, the 4th diode, filter capacitor C
1.
In above-mentioned arbitrary technical scheme, preferably, the composite cores material that current transformer adopts comprises two kinds of core material A and B, and A core material and B core material are fixed in nonmetal wrappage.
In above-mentioned arbitrary technical scheme, preferably, the ratio that in composite cores material, A core material accounts for is greater than B core material.
In above-mentioned arbitrary technical scheme, preferably, in composite cores material, the saturation induction density of A core material is higher than B core material, and the magnetic hysteresis loss of B core material is less than A core material.
In above-mentioned arbitrary technical scheme, preferably, described A core material adopts silicon steel sheet.
In above-mentioned arbitrary technical scheme, preferably, described B core material adopts ferrite, permalloy, amorphous, ferrocart core, any one in nanocrystalline.
In above-mentioned arbitrary technical scheme, preferably, the overall dimension of current transformer and shape can be made according to the actual size of cable.
The invention also discloses a kind of electricity-fetching method of the current transformer that adopts composite cores material, when transmission line electric current hour, adopt the electricity getting device of the current transformer of composite cores material to there is higher power taking efficiency; In the time that transmission line electric current is larger, this current transformer electricity getting device can be avoided current transformer heating in stable output voltage.
In above-mentioned arbitrary technical scheme preferably, when transmission line electric current hour, adopt magnetizing inductance and the external capacitor resonance of the current transformer of composite cores material, raising power output; In the time that transmission line electric current is larger, adopt the B core material part of the current transformer of composite cores material to enter magnetic saturation state, can protect remaining A core material not enter magnetic saturation state.
In above-mentioned arbitrary technical scheme, preferably, enter the B core material part of magnetic saturation state, there is less loss, suppress the heating of current transformer electricity getting device.
The current transformer of employing composite cores material of the present invention obtains the device of electric energy, comprises design and the power-supply circuit thereof of current transformer.This device all has good load characteristic under the little current status of high-tension cable He under current state.Adopt the electricity-fetching method of the current transformer electricity getting device of composite cores material, at transmission line electric current hour, instrument transformer magnetizing inductance and external capacitor resonance, raising power output; In the time that transmission line electric current is larger, the sub-fraction core material of current transformer enters magnetic saturation state, has so both realized output voltage stabilizing function, has suppressed again device overall losses.The peripheral circuit of the current transformer electricity getting device of employing composite cores material is very simple, has the very high electrical stability that supplies, and has a wide range of applications and wide market prospects, is particularly suitable for high-tension cable induction power taking.
The current transformer of employing composite cores material of the present invention obtains device and the electricity-fetching method of electric energy, by magnetic core characteristic and circuit design, the feature that limits output voltage when resonance power taking and large electric current are inputted can automatically realize little electric current input time, has advantages of that circuit is simple, reliability is high.
The current transformer of employing composite cores material of the present invention obtains the device of electric energy, the overall dimension of the size of composite cores and umber of turn and current transformer (1) is according to the actual size design of cable, and the magnetic core cross section of A core material, B core material is designed according to practical situations.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of a kind of traditional electricity getting device of prior art;
Fig. 2 is the circuit theory diagrams of a kind of resonance electricity getting device of prior art;
Fig. 3 is the circuit theory diagrams that the current transformer of employing composite cores material of the present invention obtains a preferred embodiment of the device of electric energy;
Fig. 4 is the current transformer structure figure based on composite cores material of the current transformer of the employing composite cores material of the present invention preferred embodiment that obtains the device of electric energy.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is elaborated, below describe only conduct demonstration and explain, the present invention is not done to any pro forma restriction.
As shown in Figure 3, adopt the current transformer of composite cores material to obtain the device of electric energy, comprise current transformer 1, resonant capacitance C
r, rectification filtering unit 2, load R
l, current transformer is for obtaining through the induced current on the cable of its magnetic core.Current transformer (1) adopts composite cores material, and current transformer 1 secondary magnetizing inductance value L
mwith C
rmeet condition of resonance,
, its
ffor instrument transformer primary current frequency.
As shown in Figure 4, the composite cores material that current transformer (1) adopts comprises two kinds of core material A and B, and in composite cores material, the accounting of A core material is greater than B core material; The saturation induction density of A core material is higher than B core material, and the magnetic hysteresis loss of B core material is less than A core material.A core material can be silicon steel sheet, and B core material can adopt ferrite, permalloy, amorphous, ferrocart core, nanocrystalline medium.
Current transformer (1) is enclosed within on ultra-high-tension power transmission line, transmission line alternating current
i s(
t) through current transformer 1 magnetic core, and produce induced current on its secondary winding.It is that 160mm, sectional area are 4cm at diameter that current transformer adopts
2ring-shaped silicon steel sheet magnetic core in embed the ferrite of 4mm thickness, magnetic core is wound around outward
n=400 circle secondary windings, are then placed in insulation crust together, its secondary magnetizing inductance
l mbe about 2H.The secondary winding of current transformer 1 and resonant capacitance C
rparallel connection, and receive the input of rectification filtering unit 2, the output termination load R of rectification filtering unit 2
l, for the alternation induction electric energy producing on the secondary winding of current transformer 1 is converted to direct current energy.
Its rectification filtering unit 2 comprises the first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, filter capacitor C
1.Resonant capacitance C
radopt the CBB electric capacity of 4.7F,
d 1~
d 4adopt paster Schottky diode SS34, filter capacitor
c oadopt the electrochemical capacitor of 100 μ F/400V.
Power taking maximum output voltage is
, wherein N is the number of turn,
ffor frequency, S is magnetic core sectional area, B
maxfor saturation induction density.Get B
max=0.6T, can obtain
.
At transmission line electric current hour, adopt the current transformer electricity getting device of composite cores material to there is higher power taking efficiency; In the time that transmission line electric current is larger, this current transformer electricity getting device can be avoided current transformer heating in stable output voltage.
At transmission line electric current hour, adopt magnetizing inductance and the external capacitor resonance of the current transformer of composite cores material, raising power output; In the time that transmission line electric current is larger, adopt the B core material part of the current transformer of composite cores material to enter magnetic saturation state, can protect remaining A core material not enter magnetic saturation state.The B core material part that enters magnetic saturation state, has less loss, has greatly suppressed the heating of current transformer electricity getting device.
The above is only that the preferred embodiment of the present invention is described; not that scope of the present invention is limited; design under the prerequisite of spirit not departing from the present invention; various distortion and improvement that the common engineers and technicians in this area make technical scheme of the present invention, all should fall in the definite protection range of claims of the present invention.
Claims (10)
1. adopt the current transformer of composite cores material to obtain a device for electric energy, comprise current transformer (1), resonant capacitance (C
r), rectification filtering unit (2), load (R
l), it is characterized in that: described current transformer (1) adopts composite cores material, and current transformer (1) secondary magnetizing inductance value L
mwith C
rmeet condition of resonance,
, its
ffor instrument transformer primary current frequency.
2. the current transformer of employing composite cores material as claimed in claim 1 obtains the device of electric energy, it is characterized in that: described current transformer (1) is enclosed within on transmission line, transmission line alternating current passes current transformer (1) magnetic core, and produces induced current on its secondary winding.
3. the current transformer of employing composite cores material as claimed in claim 2 obtains the device of electric energy, it is characterized in that: the secondary winding of described current transformer (1) and resonant capacitance (C
r) parallel connection, and receive the input of rectification filtering unit (2), the output termination load (R of rectification filtering unit (2)
l).
4. the current transformer of employing composite cores material as claimed in claim 1 obtains the device of electric energy, it is characterized in that: described rectification filtering unit (2) comprises the first diode (D1), the second diode (D2), the 3rd diode (D3), the 4th diode (D4), filter capacitor C
1.
5. the current transformer of employing composite cores material as claimed in claim 1 or 2 obtains the device of electric energy, it is characterized in that: the composite cores material that current transformer (1) adopts comprises two kinds of core material A and B.
6. the current transformer of employing composite cores material as claimed in claim 5 obtains the device of electric energy, it is characterized in that: the ratio that in composite cores material, A core material accounts for is greater than B core material.
7. the current transformer of employing composite cores material as claimed in claim 5 obtains the device of electric energy, it is characterized in that: in composite cores material, the saturation induction density of A core material is higher than B core material, and the magnetic hysteresis loss of B core material is less than A core material.
8. the current transformer of employing composite cores material as claimed in claim 5 obtains the device of electric energy, it is characterized in that: described A core material adopts silicon steel sheet.
9. one kind adopts the electricity-fetching method of the current transformer of composite cores material, comprise the current transformer electricity getting device of the employing composite cores material as described in claim 1 to 9, it is characterized in that: when transmission line electric current hour, adopt the current transformer electricity getting device of composite cores material to there is higher power taking efficiency; In the time that transmission line electric current is larger, this current transformer electricity getting device can be avoided current transformer heating in stable output voltage.
10. the current transformer electricity getting device of employing composite cores material as claimed in claim 9, is characterized in that: when transmission line electric current hour, adopt magnetizing inductance and the external capacitor resonance of the current transformer of composite cores material, raising power output; In the time that transmission line electric current is larger, adopt the B core material part of the current transformer of composite cores material to enter magnetic saturation state, can protect remaining A core material not enter magnetic saturation state.
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|---|---|---|---|
| CN201410101138.0A CN103840567A (en) | 2014-03-19 | 2014-03-19 | Device and method for obtaining electric energy through current transformer made of composite magnetic core materials |
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|---|---|---|---|
| CN201410101138.0A CN103840567A (en) | 2014-03-19 | 2014-03-19 | Device and method for obtaining electric energy through current transformer made of composite magnetic core materials |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104734049A (en) * | 2015-03-25 | 2015-06-24 | 河南晶能电子科技有限公司 | Electrical distribution box temperature automatic heat dissipation controller |
| CN105048654A (en) * | 2015-09-06 | 2015-11-11 | 国家电网公司 | Electric field overhead line wireless energy taking device |
| CN106199139A (en) * | 2016-08-30 | 2016-12-07 | 浙江图维科技股份有限公司 | One is asked for electric-type inductance loop stream monitoring device and method |
| CN110932573A (en) * | 2019-12-18 | 2020-03-27 | 科大智能电气技术有限公司 | High-efficiency power-taking rectifying and protecting circuit |
| CN112614667A (en) * | 2020-12-11 | 2021-04-06 | 福州大学 | Ground wire tuning energy-taking reactor with parameter self-adaptive adjusting function |
| CN113343616A (en) * | 2021-04-29 | 2021-09-03 | 西安交通大学 | Optimal design method and system for power supply of current transformer |
| CN114325138A (en) * | 2021-12-24 | 2022-04-12 | 上海嘉益电器设备有限公司 | Measuring coil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104734049A (en) * | 2015-03-25 | 2015-06-24 | 河南晶能电子科技有限公司 | Electrical distribution box temperature automatic heat dissipation controller |
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| CN110932573A (en) * | 2019-12-18 | 2020-03-27 | 科大智能电气技术有限公司 | High-efficiency power-taking rectifying and protecting circuit |
| CN112614667A (en) * | 2020-12-11 | 2021-04-06 | 福州大学 | Ground wire tuning energy-taking reactor with parameter self-adaptive adjusting function |
| CN112614667B (en) * | 2020-12-11 | 2021-12-21 | 福州大学 | Ground wire tuning energy-taking reactor with parameter self-adaptive adjusting function |
| CN113343616A (en) * | 2021-04-29 | 2021-09-03 | 西安交通大学 | Optimal design method and system for power supply of current transformer |
| CN113343616B (en) * | 2021-04-29 | 2023-05-23 | 西安交通大学 | Optimal design method and system for current transformer power supply |
| CN114325138A (en) * | 2021-12-24 | 2022-04-12 | 上海嘉益电器设备有限公司 | Measuring coil |
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Application publication date: 20140604 |