CN216248130U - Current collecting device applied to one-time punching installation of power distribution network - Google Patents

Current collecting device applied to one-time punching installation of power distribution network Download PDF

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CN216248130U
CN216248130U CN202122271700.2U CN202122271700U CN216248130U CN 216248130 U CN216248130 U CN 216248130U CN 202122271700 U CN202122271700 U CN 202122271700U CN 216248130 U CN216248130 U CN 216248130U
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transformer
main
current
auxiliary
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郁寅锋
彭时雄
王聪
柴小亮
李海璇
安春亮
王彦博
张子静
张子航
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Baoding City Weida Electric Power Equipment Co ltd
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Baoding City Weida Electric Power Equipment Co ltd
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Abstract

The application discloses be applied to electric current collection system of distribution network installation of once wearing to pass through includes: the current transformer comprises a main current transformer, a small current transformer and a current-voltage converter; the output end of the main current transformer is connected with the small current transformer in a cascade way, and the output end of the small current transformer is connected with the input end of the current-voltage converter; the main current transformer collects the current of the distribution line and outputs the secondary current of the main current transformer; the small current transformer collects the secondary current of the main current transformer and outputs the secondary current of the small current transformer; the current-voltage converter converts the secondary current of the small current transformer into a voltage signal, and the voltage signal is used for carrying out input range matching conversion through the AD converter to obtain the current value of the distribution line. The measuring accuracy and the dynamic measuring range of the mutual inductor are greatly improved, so that the measuring accuracy of the collecting device is remarkably improved, and the technical requirement of high-accuracy current measurement of a power distribution network is met.

Description

Current collecting device applied to one-time punching installation of power distribution network
Technical Field
This application belongs to distribution network detection area, and concretely relates to is applied to current collection system of distribution network through installation once.
Background
In a power distribution network, a traditional current transformer is generally a current transformer for protection and a current transformer for measurement, and the two current transformers are generally used for field microcomputer protection equipment and metering electric meter equipment. In recent years, along with the continuous deep construction of a power distribution network, a rapidly-installed high-precision current collector of the power distribution network with 1 turn through (namely, a single-turn current transformer) is urgently needed on the power distribution network, and the current parameters of the power distribution network are obtained at high precision through simple and convenient field installation, so that the new technical requirements of monitoring, early warning, fault study and judgment of various states of the power distribution network and the like are met.
The current design method of the current transformer for the power of the power distribution network generally adopts the design of the common electromagnetic induction principle, namely, the required number of turns of a coil is wound on a single transformer iron core, so that the primary and secondary current conversion of the current transformer is realized. Or an electronic transformer principle based on the Rogowski coil is adopted, a complex integrating circuit is required for the secondary, the design is complex, meanwhile, according to the 2 design principles, the accuracy of the transformer can be reduced under the condition of a one-time core-through 1-turn structure, after the transformer is designed to be an open type structure, the accuracy of the transformer can not be guaranteed, and the requirement for high-precision current measurement of a power distribution network is difficult to meet.
SUMMERY OF THE UTILITY MODEL
The current acquisition device of being applied to distribution network one-time punching installation is proposed in this application, through designing the novel current transformer of a turn open-type installation and designing the novel second level undercurrent transformer to through two-stage current transformer's cascade application, the distribution lines current conversion who will gather is voltage signal, and this voltage signal accessible AD converter carries out the input range and matches the accurate current value that the conversion obtained the distribution lines.
In order to achieve the above purpose, the present application provides the following solutions:
be applied to current acquisition device of distribution network installation of punching once, include: the current transformer comprises a main current transformer, a small current transformer and a current-voltage converter;
the output end of the main current transformer is connected with the small current transformer in a cascade way, and the output end of the small current transformer is connected with the input end of the current-voltage converter;
the main current transformer is used for collecting the current of the distribution line and outputting the secondary current of the main current transformer;
the small current transformer is used for collecting the secondary current of the main current transformer and outputting the secondary current of the small current transformer;
the current-voltage converter is used for converting the secondary current of the small current transformer into a voltage signal, and the voltage signal is used for carrying out input range matching conversion through an AD converter to obtain the current value of the distribution line.
Preferably, the main current transformer adopts a one-time punching one-turn open type structure, and is installed on the distribution line in a punching mode.
Preferably, the main current transformer comprises a main transformer and an auxiliary transformer;
the main transformer comprises a main transformer single-turn primary winding and a main transformer secondary winding, and the main transformer single-turn primary winding forms a main transformer primary end;
the auxiliary mutual inductor comprises an auxiliary mutual inductor single-turn primary winding, an auxiliary mutual inductor multi-turn primary winding and an auxiliary mutual inductor secondary winding, and the auxiliary mutual inductor single-turn primary winding forms a primary end of the auxiliary mutual inductor;
the single-turn primary winding of the main transformer and the single-turn primary winding of the auxiliary transformer are connected in series;
one end of the secondary winding of the main mutual inductor forms a first output end of the secondary winding of the main mutual inductor, and the other end of the secondary winding of the main mutual inductor forms a second output end of the secondary winding of the main mutual inductor;
one end of the multi-turn primary winding of the auxiliary transformer forms a first input end of the multi-turn primary winding of the auxiliary transformer, and the other end of the multi-turn primary winding of the auxiliary transformer forms a second input end of the multi-turn primary winding of the auxiliary transformer;
the second output end of the secondary winding of the main transformer is connected with the first input end of the multi-turn primary winding of the auxiliary transformer;
the first output end of the secondary winding of the main transformer and the second input end of the multi-turn primary winding of the auxiliary transformer form the output end of the main current transformer.
Preferably, the main transformer further comprises a main iron core;
and the secondary winding of the main transformer is wound on the main iron core.
Preferably, the main transformer secondary winding comprises a first section of the main transformer secondary winding and a second section of the main transformer secondary winding, and the number of turns of the first section of the main transformer secondary winding is the same as that of the second section of the main transformer secondary winding;
the main iron core comprises a main iron core first section and a main iron core second section, and the main iron core first section and the main iron core second section are the same in length;
the first section of the secondary winding of the main mutual inductor is wound on the first section of the main iron core;
and the second section of the secondary winding of the main transformer is wound on the second section of the main iron core.
Preferably, the auxiliary transformer further comprises an auxiliary transformer secondary winding and an auxiliary iron core;
the auxiliary transformer secondary winding and the auxiliary transformer multi-turn primary winding are wound on the auxiliary iron core;
and the output end of the secondary winding of the auxiliary transformer is connected with an adjustable load.
Preferably, the auxiliary transformer multi-turn primary winding comprises an auxiliary transformer multi-turn primary winding first section and an auxiliary transformer multi-turn primary winding second section, and the number of turns of the auxiliary transformer multi-turn primary winding first section is the same as that of the auxiliary transformer multi-turn primary winding second section;
the auxiliary transformer secondary winding comprises an auxiliary transformer secondary winding first section and an auxiliary transformer secondary winding second section, and the number of turns of the auxiliary transformer secondary winding first section is the same as that of the auxiliary transformer secondary winding second section;
the auxiliary iron core comprises an auxiliary iron core first section and an auxiliary iron core second section, and the auxiliary iron core first section and the auxiliary iron core second section are equal in length;
the first section of the multi-turn primary winding of the auxiliary transformer and the first section of the secondary winding of the auxiliary transformer are wound on the first section of the auxiliary iron core;
the second section of the multi-turn primary winding of the auxiliary transformer and the second section of the secondary winding of the auxiliary transformer are wound on the second section of the auxiliary iron core;
preferably, the structure of the small current transformer is the same as that of the main current transformer.
Preferably, the current-voltage converter is an operational amplifier;
the input end of the operational amplifier is connected with the output end of the small current transformer;
the output end of the operational amplifier is connected with the AD converter.
The beneficial effect of this application does:
the application discloses be applied to current collection system of distribution network punching installation once, through the concatenation and the current-voltage transform of two novel current transformer for main transformer's secondary load is close to the fixed load value that is a lightweight, has increased substantially main transformer's precision and dynamic measurement scope, makes collection system's measurement accuracy level show the improvement, satisfies distribution network high accuracy current measurement technical requirement, has wide popularization space and use value.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural view of a current collecting device applied to one-time through installation of a power distribution network in an embodiment of the present application;
FIG. 2 is a schematic diagram of a first stage main current transformer in an embodiment of the present application;
FIG. 3 is a schematic diagram of a wiring diagram of a secondary output terminal of a first-stage main current transformer cascaded with a second-stage small current transformer in the embodiment of the present application;
fig. 4 is a schematic flow chart of a method for collecting current by applying the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, a schematic structural diagram of a current collecting device applied to a power distribution network in a one-time through installation in the embodiment of the present application is shown, in the embodiment, a three-stage structure is adopted, a first stage is a main current transformer, a second stage is a small current transformer, and a third stage is a current-voltage converter.
The first-stage main current transformer adopts a one-time punching structure, is directly punched and installed on a line of a distribution line, and can be divided into a closed type and an open type. The present embodiment adopts an open type. The first-stage main current transformer adopts a double-iron-core separation passive compensation mode, and realizes the high accuracy (0.05SS level) of the first-stage main current transformer by light-load design (the typical value is 0.1 omega load) and accurate calculation of the matching parameters of the wound coil.
The second-stage small current transformer and the third-stage current-voltage converter are directly arranged on a PCB (printed circuit board) of the matched secondary equipment by adopting an integral design, so that secondary zero load and current-voltage conversion are realized. The second-stage small current transformer reduces the secondary current output of the first-stage main current transformer to the operational amplifier working range of the third-stage current-voltage transformer, the third-stage input requirement is met, current-voltage conversion is achieved, meanwhile, the second-stage small current transformer is equivalent to the load of the first-stage main current transformer, and light load design is achieved. The second-stage small current transformer also adopts a double-iron-core passive compensation mode, high accuracy level under the load of 0 ohm is achieved, meanwhile, the designed second-stage small current transformer converts impedance to impedance of a primary side, the designed impedance is not more than 0.1 ohm, and the light load requirement of the first-stage main current transformer is met.
The third-stage current-voltage converter realizes required voltage output by connecting resistors with proper resistance in parallel, and is convenient for input range matching conversion with different AD converters.
The output of the first-stage main current transformer is connected with the input of the second-stage small current transformer by adopting a 2-core cable, and the required length is arranged according to the field condition. And the output end of the third-stage current-voltage converter is connected in parallel with a resistor with a proper resistance value to realize current-voltage conversion.
In the embodiment, the transformation ratio of the main current transformer of the first stage is designed according to the actual requirements of a power distribution network, and the secondary output is typically designed according to 1A. The transformation ratio of the small current transformer of the second stage is 1A/0.01A in a typical design value. And a third-level current-voltage converter is connected with a 353 ohm resistor in parallel (actual matching adjustment can be carried out according to the AD input range), so that rated 3.53V voltage output is realized.
Fig. 2 is a schematic diagram of a primary current transformer in the first stage of this embodiment, which adopts a one-time through open type structure, and the design principle is a dual-core separation passive compensation mode, and adopts a main and auxiliary transformer separation structure.
In fig. 2, Z: the equivalent resistance is converted from the load connected with the secondary side of the main current transformer, namely the small current transformer of the second stage to the primary side.
The single-turn primary winding of the main transformer is marked as W1The single-turn primary winding of the auxiliary transformer is marked as W1', all adopt 1 through-core turn, i.e. W1＝W1' -1 turn. The straight-through 1 turn is the cable of the existing running line (the open-type mutual inductor is sleeved on the cable).
The main mutual inductive secondary winding is marked W2，W2The two sections of windings are respectively wound on the first section of the main iron core and the second section of the main iron core, namely the first section of the main iron core is wound with W2A 2 turns of W wound on the second section of the main core2And 2 turns. And then both are connected in series. Two output ends of the secondary winding of the main transformer are marked as K1And a terminal c. The ends a-b must be connected after the main core is cut open.
Z2: is a secondary winding W of a main mutual inductor2The coil impedance of (1).
The multi-turn primary winding of the auxiliary transformer is marked as W2-b。W2-bThe winding is also divided into two parts, namely a first section of the multi-turn primary winding of the auxiliary transformer and a second section of the multi-turn primary winding of the auxiliary transformer, the middle breakpoints are marked as e and f, the two sections of windings are respectively wound on the first section of the auxiliary iron core and the second section of the auxiliary iron core, namely the W is wound on the first section of the auxiliary iron core2-b/2, winding W on the second section of the auxiliary iron core2-b/2. The two are connected in series, and two incoming line terminals of the auxiliary mutual inductor are marked as d and K2And (4) an end. The e-f terminal is connected after the auxiliary iron core is cut.
Z2-b: multi-turn primary winding W for auxiliary mutual inductor2-bThe coil impedance of (1).
Secondary of auxiliary mutual inductorThe windings being marked Wb2，Wb2The winding is also divided into two sections, namely a first section of a secondary winding of the auxiliary transformer and a second section of the secondary winding of the auxiliary transformer, the middle break points are marked as g and h, the two sections of windings are respectively wound on the first section of the auxiliary iron core and the second section of the auxiliary iron core, namely W is wound on the first section of the auxiliary iron coreb2A 2 turns, W is also wound on the second section of the auxiliary iron coreb2A/2 turns connected in series, the outlet line is marked as b1And b2And (4) an end. The middle break point g-h is connected after the auxiliary iron core is cut.
Zb2: is a secondary winding W of an auxiliary mutual inductorb2The coil impedance of (1).
The current transformer structure adopts a double-iron-core separation mode, facilitates independent production and winding of each iron core coil, and finally becomes a complete current transformer after being connected and assembled through the connecting wires.
In the embodiment, the secondary load Z of the auxiliary transformer is properly selectedbThe value of (Z + Z) is such that the total load of the secondary circuit of the main transformer is (Z + Z)2+Z2-b) The required voltage is totally controlled by the magnetic flux in the auxiliary iron core at W2-bThe potential induced by the winding is provided so that the main core excitation current is minimized and the error of the current transformer is close to 0.
The optimal compensation conditions are derived as follows:
Figure DEST_PATH_GDA0003498141500000091
in order to easily satisfy the above conditions, the present embodiment takes the following technical measures:
1) the load of the current transformer is designed to be light load, namely Z is very small, and the impedance is generally designed to be not more than 0.1 ohm;
2) fixed W2-b＝Wb(ii) a In the formula, Wb＝W2-W2-b，WbThe number of turns of an equivalent primary winding of the auxiliary transformer is set;
3) fixed Z ═ Zb；
4) Reducing the leakage reactance of each winding to be close to 0 by adopting a scientific winding method;
5) through the accurate calculation of the formula, the proper specification of the enameled wire of each winding is selected, so that the impedance Z of the secondary winding of the transformer is enabled to beb2Exactly equal to the total secondary loop impedance Z2+Z2-bMeanwhile, on the basis of meeting the formula, the coil impedance value of each winding is reduced as much as possible.
6) After the transformer is integrally cut, finely polishing the contact surface of the cut iron core to reduce the air gap of the iron core;
7) the mutual inductor adopts a specific difference and angle difference debugging circuit to carry out the adjustment of possible errors (specific difference and angle difference) of the mutual inductor finally;
through the technical measures, the technical requirement of high accuracy grade of the main current transformer of the first grade is met.
In this embodiment, an open-type phase current transformer for a distribution network is set, and a rated current ratio is set to 600A/1A, then W2600 turns, W2-b300 turns, Wb2300 turns, and Z0.05 ohm.
Then, the open-type main current transformer designed according to the principle meets the accurate level of 0.05SS level (proved by examination, the 0.05SS level has the international leading level), namely:
5％In、20％In、100％In、120％Inthe specific value difference is less than or equal to 0.05 percent, and the phase difference is less than or equal to 2';
1％Inthe specific value difference is less than or equal to 0.1 percent, and the phase difference is less than or equal to 4'.
InThe rated current value of the current transformer.
If the zero sequence current transformer for the power distribution network is set, the rated current ratio is designed to be 100A/1A, then W2100 turns, W2-b50 turns Wb250 turns, and Z1 ohm.
Then, according to the open-type zero sequence current transformer designed according to the principle, the accurate level meets 0.2S level (proved by examination, 0.2S level has international leading level), namely:
20％In、100％In、120％In、150％Inthe specific value difference is less than or equal to 0.2 percent, and the phase difference is less than or equal to 10'
5％InThe ratio difference is less than or equal to 0.35 percent, and the phase difference is less than or equal to 15 percent.
1％InThe ratio difference is less than or equal to 0.75 percent, and the phase difference is less than or equal to 30 percent.
The design values of the secondary load capacity of the primary current transformer are small, the typical design value is 0.1 omega (or 1 omega) of the secondary load, if the secondary load is directly input into secondary monitoring equipment, I-V conversion is needed, and if the secondary load is directly connected with a resistor, errors are seriously influenced due to too large load resistance. Therefore, the present embodiment adopts the zero load conversion method.
The zero load conversion method is designed by adopting an operational amplifier principle, the operational amplifier has limited secondary input capacity, generally the maximum more than ten mA, therefore, before the input current voltage converter, the secondary input current value needs to be further reduced, specifically, a second-stage small current transformer is further cascaded at the secondary output end of the first-stage main current transformer to further reduce the secondary current output value, and a wiring schematic diagram is shown in fig. 3.
And connecting the secondary output of the second-stage small current transformer to a current-voltage converter so as to realize a zero-load conversion method.
The zero load transformation method realizes the zero load of the current transformer by means of the impedance transformation function of the operational amplifier, the operational amplifier is in the amplifying working state, the minus input end always keeps the potential difference of 0V, which is equivalent to that the secondary winding of the current transformer is directly short-circuited, namely the zero load is connected.
In this embodiment, the design principle of the second-stage small current transformer is also a double-iron-core passive compensation mode, and the load is designed to be 0 ohm, so that the high accuracy of the second-stage small current transformer is realized.
Meanwhile, the small current transformer of the second stage is used as the load of the main current transformer of the first stage, and the equivalent load of the small current transformer is required to meet the light load requirement of the main current transformer, namely
Figure DEST_PATH_GDA0003498141500000111
< first level main transformer load value.
Wherein Z1Is a small current mutual connectionPrimary winding impedance of inductor, Z2Is the impedance of the secondary winding of the small current transformer, KbThe rated transformation ratio of the small current transformer is obtained.
The operational amplifier converts the small current into a voltage signal for the AD conversion circuit to perform input range matching conversion, and the magnitude of the voltage signal can be set by a resistor connected in parallel with the output end of the operational amplifier.
In the present embodiment, a typical design value of the small current transformer of the second stage is set to 1A/0.01A, and the accurate stage satisfies 0.01SS stage (the 0.01SS stage has been proved to have an international leading level), that is:
when 5% In, 20% In, 100% In and 120% In, the ratio difference is less than or equal to 0.01% and the phase difference is less than or equal to 0.3';
when the In content is 1%, the ratio difference is less than or equal to 0.02%, and the phase difference is less than or equal to 0.6'.
Therefore, the impedance of the 1A side of the small current transformer of the 1A/0.01A second stage is converted to be less than or equal to 0.05 ohm, and the accuracy of the first stage main current transformer is effectively improved.
This embodiment develops the high accuracy main current transformer of novel 1 circle open-type installation through the research, develops high accuracy undercurrent transformer with the research to cascade high accuracy undercurrent transformer and current-voltage converter through high accuracy main current transformer, the distribution lines electric current that will gather is accurate to be converted into voltage signal, increases substantially main transformer's precision and dynamic measurement scope, makes whole equipment measurement accuracy level show the improvement, satisfies distribution network high accuracy current measurement technical requirement.
As shown in fig. 4, a method for collecting current by applying the embodiment of the present application mainly includes the following steps:
s102, collecting current of a distribution line through a main current transformer, and outputting secondary current of the main transformer;
s104, collecting the secondary current of the main transformer through a small current transformer, and outputting the secondary current of the small current transformer;
and S106, converting the secondary current of the small current transformer into a voltage signal through a current-voltage converter, wherein the voltage signal is used for performing input range matching conversion through an AD converter to obtain the current value of the distribution line, and finishing current collection.
The above-described embodiments are merely illustrative of the preferred embodiments of the present application, and do not limit the scope of the present application, and various modifications and improvements made to the technical solutions of the present application by those skilled in the art without departing from the spirit of the present application should fall within the protection scope defined by the claims of the present application.

Claims (9)

1. Be applied to current acquisition device of distribution network one-time punching installation, its characterized in that includes: the current transformer comprises a main current transformer, a small current transformer and a current-voltage converter;
the output end of the main current transformer is connected with the small current transformer in a cascade way, and the output end of the small current transformer is connected with the input end of the current-voltage converter;
the main current transformer is used for collecting the current of the distribution line and outputting the secondary current of the main current transformer;
the small current transformer is used for collecting the secondary current of the main current transformer and outputting the secondary current of the small current transformer;
the current-voltage converter is used for converting the secondary current of the small current transformer into a voltage signal, and the voltage signal is used for carrying out input range matching conversion through an AD converter to obtain the current value of the distribution line.
2. The current collection device applied to the one-time through installation of the power distribution network of claim 1, wherein the main current transformer adopts a one-time through one-turn open type structure, and is installed on the distribution line in a through mode.
3. The current collection device applied to the primary through installation of the power distribution network of claim 2, wherein the main current transformer comprises a main transformer and an auxiliary transformer;
the main transformer comprises a main transformer single-turn primary winding and a main transformer secondary winding, and the main transformer single-turn primary winding forms a main transformer primary end;
the auxiliary mutual inductor comprises an auxiliary mutual inductor single-turn primary winding, an auxiliary mutual inductor multi-turn primary winding and an auxiliary mutual inductor secondary winding, and the auxiliary mutual inductor single-turn primary winding forms a primary end of the auxiliary mutual inductor;
the single-turn primary winding of the main transformer and the single-turn primary winding of the auxiliary transformer are connected in series;
one end of the secondary winding of the main mutual inductor forms a first output end of the secondary winding of the main mutual inductor, and the other end of the secondary winding of the main mutual inductor forms a second output end of the secondary winding of the main mutual inductor;
one end of the multi-turn primary winding of the auxiliary transformer forms a first input end of the multi-turn primary winding of the auxiliary transformer, and the other end of the multi-turn primary winding of the auxiliary transformer forms a second input end of the multi-turn primary winding of the auxiliary transformer;
the second output end of the secondary winding of the main transformer is connected with the first input end of the multi-turn primary winding of the auxiliary transformer;
the first output end of the secondary winding of the main transformer and the second input end of the multi-turn primary winding of the auxiliary transformer form the output end of the main current transformer.
4. The current collection device applied to primary cross-core installation of a power distribution network of claim 3, wherein the main transformer further comprises a main iron core;
and the secondary winding of the main transformer is wound on the main iron core.
5. The current collection device applied to one-time through installation of a power distribution network according to claim 4,
the secondary winding of the main transformer comprises a first section of the secondary winding of the main transformer and a second section of the secondary winding of the main transformer, and the number of turns of the first section of the secondary winding of the main transformer is the same as that of the second section of the secondary winding of the main transformer;
the main iron core comprises a main iron core first section and a main iron core second section, and the main iron core first section and the main iron core second section are the same in length;
the first section of the secondary winding of the main mutual inductor is wound on the first section of the main iron core;
and the second section of the secondary winding of the main transformer is wound on the second section of the main iron core.
6. The current collection device applied to the primary through installation of the power distribution network of claim 3, wherein the auxiliary transformer further comprises an auxiliary transformer secondary winding and an auxiliary iron core;
the auxiliary transformer secondary winding and the auxiliary transformer multi-turn primary winding are wound on the auxiliary iron core;
and the output end of the secondary winding of the auxiliary transformer is connected with an adjustable load.
7. The current collection device applied to one-time through installation of a power distribution network according to claim 6,
the auxiliary transformer multi-turn primary winding comprises an auxiliary transformer multi-turn primary winding first section and an auxiliary transformer multi-turn primary winding second section, and the number of turns of the auxiliary transformer multi-turn primary winding first section is the same as that of the auxiliary transformer multi-turn primary winding second section;
the auxiliary transformer secondary winding comprises an auxiliary transformer secondary winding first section and an auxiliary transformer secondary winding second section, and the number of turns of the auxiliary transformer secondary winding first section is the same as that of the auxiliary transformer secondary winding second section;
the auxiliary iron core comprises an auxiliary iron core first section and an auxiliary iron core second section, and the auxiliary iron core first section and the auxiliary iron core second section are equal in length;
the first section of the multi-turn primary winding of the auxiliary transformer and the first section of the secondary winding of the auxiliary transformer are wound on the first section of the auxiliary iron core;
and the second section of the multi-turn primary winding of the auxiliary transformer and the second section of the secondary winding of the auxiliary transformer are wound on the second section of the auxiliary iron core.
8. The current collection device applied to one-time through installation of a power distribution network of claim 1, wherein the structure of the small current transformer is the same as that of the main current transformer.
9. The current collection device applied to one-time straight-through installation of the power distribution network according to claim 1, wherein: the current-voltage converter is an operational amplifier;
the input end of the operational amplifier is connected with the output end of the small current transformer;
the output end of the operational amplifier is connected with the AD converter.
CN202122271700.2U 2021-09-18 2021-09-18 Current collecting device applied to one-time punching installation of power distribution network Active CN216248130U (en)

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