CN212570694U - Rail homodromous current difference transformer - Google Patents
Rail homodromous current difference transformer Download PDFInfo
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- CN212570694U CN212570694U CN202021689425.5U CN202021689425U CN212570694U CN 212570694 U CN212570694 U CN 212570694U CN 202021689425 U CN202021689425 U CN 202021689425U CN 212570694 U CN212570694 U CN 212570694U
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Abstract
A track same-direction current difference transformer comprises a first iron core, a second iron core, a first resistor and a second resistor, wherein the first iron core is used for a first lead wire to penetrate through, the second iron core is used for a second lead wire to penetrate through, and the first resistor and the second resistor are connected in series; a coil AB is wound on the first iron core; one end of the coil AB, the first resistor and the other end of the coil AB are electrically connected in sequence; a coil CD is wound on the second iron core; one end of the coil CD, the second resistor and the other end of the coil CD are electrically connected in sequence; under the state that first lead wire and second lead wire communicate 50Hz electric current respectively, first iron core and second iron core produce the magnetic field, and coil AB and the same name end electric connection of coil CD, the other end of coil AB and the other end constitution measuring terminal of coil CD. The utility model discloses make full use of the flow direction characteristics of traction current and control signal electric current in the track district section, can accurately distinguish the accurate amplitude, frequency and the phase place of measuring various electric current compositions.
Description
Technical Field
The utility model relates to a railway rails technical field especially relates to a track syntropy current difference transformer.
Background
In electrified railways in China, a railway traction substation converts high-voltage electricity of a power grid into 50Hz alternating current of 25KV, one pole of the output end of a traction transformer is connected to a contact net above the railway, and the other pole of the output end of the traction transformer is connected to a steel rail and the ground; the electric locomotive obtains electric energy from a contact net by utilizing a pantograph on the roof of the electric locomotive to draw the train to run; the driving current of the electric locomotive is called traction current; the circulation loop of the traction current is sent to a contact network from the traction substation, then flows through the electric locomotive, then flows through the steel rail, and finally flows back to the traction substation through the steel rail and the ground; 50Hz traction current flows through a steel rail of the electrified railway;
in stations or sections of a railway, choke transformers are often used to divide the track into a plurality of track sections; the middle points (3 ends) of the adjacent choke transformers are connected with each other, and the 1 end and the 2 end of each choke transformer are respectively connected to the two steel rails by lead wires; the traction current can be sequentially transmitted back to a remote traction substation through the steel rail, the ends 1 and 2 of the choke transformer of the local section, the end 3 of the choke transformer of the adjacent section, the ends 1 and 2 of the choke transformer of the adjacent section and the steel rail of the adjacent section. The control signal current flows in the track section; the flow of the traction current and the control signal current is shown in fig. 1;
in order to comprehensively monitor the working states of various control devices of a railway, state quantities such as amplitudes, frequencies, phases and the like of various component control signal currents and traction currents in a track need to be measured, wherein one method is to install current transformers in the form of clamp meters at the positions of a first lead wire and a second lead wire of a choke transformer in a figure; in practical application, however, the maximum value can reach 500A or even higher because the traction current flowing in the first lead wire and the second lead wire is generally relatively large; the first lead wire and the second lead wire are made of hard materials, and no extra length is reserved generally, so that the current difference value of the two head-on wires is difficult to test by a method of bending the lead wires to form currents in opposite directions in the same transformer core;
the control signal current is typically relatively small, typically 0A to 2A; the difference between the traction current and the control signal current is about 250 times or more; if the state quantities of amplitude, frequency, phase and the like of various control signal current components are distinguished and accurately measured from the mixed current of a very large traction current and a very small control signal current, the requirements on the precision and the cost of a current transformer and a subsequent analysis and calculation circuit are very high; therefore, the application provides a track same-direction current difference transformer.
SUMMERY OF THE UTILITY MODEL
Objects of the invention
For solving the technical problem that exists among the background art, the utility model provides a track syntropy current difference transformer, the utility model discloses make full use of the traction current in the track district section and the flow direction characteristics of control signal electric current, showing and improving measuring condition, reduced the precision and the cost requirement of mutual-inductor and follow-up analysis calculation circuit, can accurately distinguish the state quantity such as amplitude, frequency and the phase place that the precision measured various current components.
(II) technical scheme
In order to solve the above problems, the present invention provides a track equidirectional current difference transformer, which comprises a first iron core for a first lead wire to pass through, a second iron core for a second lead wire to pass through, a first resistor and a second resistor;
a coil AB is wound on the first iron core; one end of the coil AB, the first resistor and the other end of the coil AB are electrically connected in sequence;
a coil CD is wound on the second iron core; one end of the coil CD, the second resistor and the other end of the coil CD are electrically connected in sequence, wherein the second iron core and the first iron core are identical in size and structure; the coil CD and the coil AB have the same number of turns; the resistance values of the second resistor and the first resistor are the same;
the directions of the 25Hz current and the 3000Hz current which respectively flow through the first lead wire and the second lead wire are opposite, and the directions of the 50Hz current which respectively flows through the first lead wire and the second lead wire are the same; the first iron core and the second iron core generate magnetic fields when the first lead wire and the second lead wire are respectively communicated with 50Hz current, the same-name ends of the coil AB and the coil CD are electrically connected, and the other end of the coil AB and the other end of the coil CD form a measuring end which is electrically connected with voltage detection equipment.
Preferably, the current value of the 50Hz current is 0-500A; the current values of 25Hz current and 3000Hz current are 0-2A.
Preferably, a plurality of groups of first lead wires penetrate through the same first iron core; the directions of 50Hz currents flowing through the groups of first leading wires are the same, and the flow directions of 25Hz currents and 3000Hz currents flowing through the groups of first leading wires are the same;
a plurality of groups of second lead wires penetrate through the same second iron core; the directions of the 50Hz currents flowing through the groups of second lead wires are the same, the directions of the 50Hz currents flowing through the groups of second lead wires are the same as the directions of the 50Hz currents flowing through the groups of first lead wires 1, the flow directions of the 25Hz currents and the 3000Hz currents flowing through the groups of second lead wires are the same, and the flow directions of the 25Hz currents and the 3000Hz currents flowing through the groups of second lead wires are opposite to the flow directions of the 25Hz currents and the 3000Hz currents flowing through the groups of first lead wires.
Preferably, the coil AB and the coil CD have opposite ends electrically connected, and the other end of the coil AB and the other end of the coil CD constitute a measuring end for measuring a sum of 50Hz currents in the first lead wire and the second lead wire and for measuring a difference between 25Hz currents and 3000Hz currents in the first lead wire and the second lead wire.
Preferably, the transformer further comprises a third iron core for passing through a third lead wire, a third resistor, a fourth resistor and a fourth iron core for passing through a fourth lead wire; the first iron core, the second iron core, the third iron core and the fourth iron core are distributed in parallel;
a coil EF is wound on the third iron core; one end of the coil EF, the third resistor and the other end of the coil EF are electrically connected in sequence;
a coil GH is wound on the fourth iron core; one end of the coil GH, the fourth resistor and the other end of the coil GH are electrically connected in sequence;
the directions of the 25Hz current and the 3000Hz current respectively flowing through the first lead wire and the second lead wire are the same, the directions of the 25Hz current and the 3000Hz current respectively flowing through the third lead wire and the fourth lead wire are the same, and the directions of the 25Hz current and the 3000Hz current respectively flowing through the third lead wire and the fourth lead wire are opposite to the directions of the 25Hz current and the 3000Hz current respectively flowing through the first lead wire and the second lead wire; the directions of 50Hz currents respectively flowing through the first lead wire, the second lead wire, the third lead wire and the fourth lead wire are the same;
under the state that the first lead wire, the second lead wire, the third lead wire and the fourth lead wire are respectively communicated with 50Hz current, ends A, C, E and G in the coil AB, the coil CD, the coil EF and the coil GH are marked as homonymous ends and are sequentially connected with the ends A, D, E and H, and the ends B and H form measuring ends used for measuring difference values of the Hz current in the first lead wire, the second lead wire, the third lead wire and the fourth lead wire and measuring the sum value of the 25Hz current in the first lead wire, the second lead wire, the third lead wire and the fourth lead wire.
The above technical scheme of the utility model has following profitable technological effect:
in the utility model, because the 50Hz current flowing through the first lead wire and the second lead wire has the same direction and the same size, when the voltage measurement is carried out at the measuring end consisting of the B end and the D end, the induced voltages generated by the 50Hz current on the first lead wire and the second lead wire on the second resistor and the first resistor can be basically offset mutually, and only the differential voltage is left;
because the 25Hz and 3000Hz currents flowing through the first lead wire and the second lead wire are opposite in direction and same in magnitude, induced voltages generated by the 25Hz current and the 3000Hz current on the first lead wire and the second lead wire on the second resistor and the first resistor are mutually superposed and are 2 times of the induced voltage generated by the first lead wire or the second lead wire independently; through mutual offset and mutual reinforcement of the induction voltages, the voltage of a measuring end consisting of the B end and the D end can be monitored to measure a 25Hz current signal, and the influence of 50Hz current is obviously reduced; the utility model can meet the requirement of detecting the difference value of the current in the same direction of the track under various conditions;
the utility model discloses make full use of the flow direction characteristics of traction current and control signal electric current in the track district section, showing and improving measuring condition, reduced the precision and the cost requirement of mutual-inductor and follow-up analysis calculation circuit, can accurately distinguish the state quantity such as amplitude, frequency and the phase place that the accurate measurement was measured to various electric current compositions.
Drawings
Fig. 1 is a flow chart of a traction current and a control signal current in a conventional railway track.
Fig. 2 is the utility model provides a structural schematic diagram of first embodiment among track syntropy current difference transformer.
Fig. 3 is a schematic structural diagram of a second embodiment in the track equidirectional current difference transformer provided by the utility model.
Fig. 4 is a schematic structural diagram of a third embodiment in the track equidirectional current difference transformer provided by the utility model.
Fig. 5 is a schematic structural diagram of a fourth embodiment in the track equidirectional current difference transformer provided by the utility model.
Reference numerals: 1. a first lead wire; 2. a first iron core; 3. a second lead line; 4. a second iron core; 5. A coil AB; 6. a first resistor; 7. a second resistor; 8. a coil CD; 9. a third lead wire; 10. a third iron core; 11. a coil EF; 12. a fourth lead wire; 13. a fourth iron core; 14. and a coil GH.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Example 1
As shown in fig. 2, the utility model provides a track equidirectional current difference transformer, including first iron core 2 for first lead wire 1 to pass through, second iron core 4 for second lead wire 3 to pass through, first resistor 6 and second resistor 7;
a coil AB5 is wound on the first iron core 2; one end of the coil AB5, the first resistor 6 and the other end of the coil AB5 are electrically connected in sequence;
a coil CD8 is wound on the second iron core 4; one end of the coil CD8, the second resistor 7 and the other end of the coil CD8 are electrically connected in sequence, wherein the size structure of the second iron core 4 is completely the same as that of the first iron core 2; coil CD8 and coil AB5 have exactly the same number of turns; the second resistor 7 and the first resistor 6 have the same resistance;
the directions of the 25Hz current and the 3000Hz current respectively flowing through the first lead wire 1 and the second lead wire 3 are opposite, and the directions of the 50Hz current respectively flowing through the first lead wire 1 and the second lead wire 3 are the same; under the condition that the first lead wire 1 and the second lead wire 3 are respectively communicated with 50Hz current, the first iron core 2 and the second iron core 4 generate magnetic fields, and the A end and the C end in the coil AB5 and the coil CD8 are marked as homonymous ends; the end A is electrically connected with the end C, and the end B at the other end of the coil AB5 and the end D at the other end of the coil CD8 form a measuring end which is electrically connected with voltage detection equipment;
furthermore, the A end, the B end, the C end and the D end form an auxiliary measuring end.
In the utility model, because the 50Hz currents flowing through the first lead wire 1 and the second lead wire 3 have the same direction and the same size, when the voltage measurement is carried out at the measuring end consisting of the end B and the end D, the induced voltages generated by the 50Hz currents on the first lead wire 1 and the second lead wire 3 on the second resistor 7 and the first resistor 6 can be basically offset, and only the differential voltage is left;
because the 25Hz and 3000Hz currents flowing through the first lead wire 1 and the second lead wire 3 are opposite in direction and same in magnitude, induced voltages generated by the 25Hz current and the 3000Hz current on the first lead wire 1 and the second lead wire 3 on the second resistor 7 and the first resistor 6 are mutually superposed and are 2 times of the induced voltage generated by the single first lead wire 1 or the single second lead wire 3; through mutual offset and mutual reinforcement of the induction voltages, the voltage of a measuring end consisting of the B end and the D end can be monitored to measure a 25Hz current signal, and the influence of 50Hz current is obviously reduced;
for example, the 50Hz current flowing through the first lead wire 1 is 500A, and the 25Hz current is 1A; the 50Hz current flowing through the second lead wire 3 is 480A, and the 25Hz current is 1A;
if the 25Hz current is measured directly at the AB end of the coil AB5 or the CD of the coil CD8, the 25Hz current of 1A needs to be analyzed and calculated under the interference of the 50Hz current of 500A, and the ratio of the interference signal to the measured signal is 500 times;
if the 25Hz signal current is measured at the two ends of the BD, the 25Hz current of 2A (1A multiplied by 2 times) is analyzed and calculated under the interference of 50Hz current of 20A (500A minus 480A), and the ratio of the interference signal to the measured signal is 10 times; by the method, the ratio of the interference signal to the tested signal is reduced by 50 times, and the test condition can be obviously improved.
Instead of measuring 25Hz current across the BD, the difference in 50Hz current of the first lead wire 1 and the second lead wire 3 can be measured directly across the BD; meanwhile, the 50Hz current value on the first lead wire 1 can be measured on AB, and the 50Hz current value on the second lead wire 3 can be measured on CD; when the 50Hz current is relatively small, the 25Hz current value can be directly measured at the two ends of the AB and the two ends of the CD to be used as the judgment condition in the special fault state.
In an optional embodiment, the current value of the 50Hz current is 0-500A; the current values of 25Hz current and 3000Hz current are 0-2A.
Example 2
As shown in fig. 3, the present invention provides a track equidirectional current difference transformer, which includes a first iron core 2 for passing a first lead wire 1, a second iron core 4 for passing a second lead wire 3, a first resistor 6 and a second resistor 7; wherein, a plurality of groups of first lead wires 1 penetrate through the same first iron core 2; a plurality of groups of second lead wires 3 penetrate through the same second iron core 4;
a coil AB5 is wound on the first iron core 2; one end of the coil AB5, the first resistor 6 and the other end of the coil AB5 are electrically connected in sequence;
a coil CD8 is wound on the second iron core 4; one end of the coil CD8, the second resistor 7 and the other end of the coil CD8 are electrically connected in sequence, wherein the size structure of the second iron core 4 is completely the same as that of the first iron core 2; coil CD8 and coil AB5 have exactly the same number of turns; the second resistor 7 and the first resistor 6 have the same resistance;
the directions of 50Hz currents flowing on the multiple groups of first lead wires 1 are the same, and the flow directions of 25Hz currents and 3000Hz currents flowing on the multiple groups of first lead wires 1 are the same;
the directions of the 50Hz currents flowing through the groups of second lead wires 3 are the same, the directions of the 50Hz currents flowing through the groups of second lead wires 3 are the same as the directions of the 50Hz currents flowing through the groups of first lead wires 1, the flow directions of the 25Hz currents and the 3000Hz currents flowing through the groups of second lead wires 3 are the same, and the flow directions of the 25Hz currents and the 3000Hz currents flowing through the groups of second lead wires 3 are opposite to the flow directions of the 25Hz currents and the 3000Hz currents flowing through the groups of first lead wires 1;
under the condition that the first lead wire 1 and the second lead wire 3 are respectively communicated with 50Hz current, the first iron core 2 and the second iron core 4 generate magnetic fields, and the A end and the C end in the coil AB5 and the coil CD8 are marked as homonymous ends; the end A is electrically connected with the end C, the end B at the other end of the coil AB5 and the end D at the other end of the coil CD8 form a measuring end for electrically connecting voltage detection equipment, namely, the end B and the end D can detect the sum of 25Hz current and 3000Hz current of a plurality of groups of first lead wires 1 and a plurality of groups of second lead wires 3 and can detect the difference of 50Hz current of the plurality of groups of first lead wires 1 and the plurality of groups of second lead wires 3;
furthermore, the A end, the B end, the C end and the D end form an auxiliary measuring end.
In an optional embodiment, the current value of the 50Hz current is 0-500A; the current values of 25Hz current and 3000Hz current are 0-2A.
Example 3
As shown in fig. 4, the utility model provides a track equidirectional current difference transformer, including first iron core 2 for first lead wire 1 to pass through, second iron core 4 for second lead wire 3 to pass through, first resistor 6 and second resistor 7;
a coil AB5 is wound on the first iron core 2; one end of the coil AB5, the first resistor 6 and the other end of the coil AB5 are electrically connected in sequence;
a coil CD8 is wound on the second iron core 4; one end of the coil CD8, the second resistor 7 and the other end of the coil CD8 are electrically connected in sequence, wherein the size structure of the second iron core 4 is completely the same as that of the first iron core 2; coil CD8 and coil AB5 have exactly the same number of turns; the second resistor 7 and the first resistor 6 have the same resistance;
the directions of the 25Hz current and the 3000Hz current respectively flowing through the first lead wire 1 and the second lead wire 3 are opposite, and the directions of the 50Hz current respectively flowing through the first lead wire 1 and the second lead wire 3 are the same; the first iron core 2 and the second iron core 4 generate magnetic fields under the condition that the first lead wire 1 and the second lead wire 3 are respectively communicated with 50Hz current, and ends A and D in the coil AB5 and the coil CD8 are marked as synonym ends; the end A is electrically connected with the end D, and the end B at the other end of the coil AB5 and the end C at the other end of the coil CD8 form a measuring end used for measuring the sum of 50Hz currents in the first lead wire 1 and the second lead wire 3 and measuring the difference of 25Hz currents and 3000Hz currents in the first lead wire 1 and the second lead wire 3;
furthermore, the A end, the B end, the C end and the D end form an auxiliary measuring end.
In an optional embodiment, the current value of the 50Hz current is 0-500A; the current values of 25Hz current and 3000Hz current are 0-2A.
Example 4
As shown in fig. 5, the utility model provides a track equidirectional current difference transformer, including first iron core 2 for supplying first lead wire 1 to pass, second iron core 4 for supplying second lead wire 3 to pass, third iron core 10 for supplying third lead wire 9 to pass, fourth iron core 13 for supplying fourth lead wire 12 to pass, third resistance, fourth resistance, first resistance 6 and second resistance 7; the first iron core 2, the second iron core 4, the third iron core 10 and the fourth iron core 13 are sequentially distributed in parallel;
a coil AB5 is wound on the first iron core 2; one end of the coil AB5, the first resistor 6 and the other end of the coil AB5 are electrically connected in sequence;
a coil CD8 is wound on the second iron core 4; one end of the coil CD8, the second resistor 7 and the other end of the coil CD8 are electrically connected in sequence;
a coil EF is wound on the third iron core 10; one end of the coil EF, the third resistor and the other end of the coil EF are electrically connected in sequence;
a coil GH is wound on the fourth iron core 13; one end of the coil GH, the fourth resistor and the other end of the coil GH are electrically connected in sequence;
the fourth iron core 13, the third iron core 10, the second iron core 4 and the first iron core 2 are completely the same in size and structure; the number of turns of the coil GH, the coil EF, the coil CD8 and the coil AB5 are completely the same; the fourth resistor, the third resistor, the second resistor 7 and the first resistor 6 have the same resistance;
the directions of the 25Hz current and the 3000Hz current respectively flowing through the first lead wire 1 and the second lead wire 3 are the same, the directions of the 25Hz current and the 3000Hz current respectively flowing through the third lead wire 9 and the fourth lead wire 12 are the same, and the directions of the 25Hz current and the 3000Hz current respectively flowing through the third lead wire 9 and the fourth lead wire 12 are opposite to the directions of the 25Hz current and the 3000Hz current respectively flowing through the first lead wire 1 and the second lead wire 3; the directions of 50Hz currents respectively flowing through the first lead wire 1, the second lead wire 3, the third lead wire 9 and the fourth lead wire 12 are the same;
under the state that the first lead wire 1, the second lead wire 3, the third lead wire 9 and the fourth lead wire 12 are respectively communicated with 50Hz current, the A end, the C end, the E end and the G end in the coil AB5, the coil CD8, the coil EF and the coil GH are marked as homonymous ends and are sequentially connected with the A end, the D end, the E end and the H end,
the terminals B and H constitute a circuit for measuring the difference between the 50Hz currents in the first and second lead wires 1 and 3 and the third and fourth lead wires 9 and 12 (i.e. the difference between the sum of the 50Hz current values in the first and second lead wires 1 and 3 and the sum of the 50Hz current values in the third and fourth lead wires 9 and 12)
And a measuring terminal for measuring a sum of 25Hz currents in the first lead wire 1 and the second lead wire 3 and the third lead wire 9 and the fourth lead wire 12 (i.e., a 25Hz current value + in the first lead wire 1 and a 25Hz current value + in the second lead wire 3 + a 25Hz current value in the third lead wire 9 + a 25Hz current value in the fourth lead wire 12).
In an optional embodiment, the current value of the 50Hz current is 0-500A; the current values of 25Hz current and 3000Hz current are 0-2A.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (5)
1. A track same-direction current difference transformer is characterized by comprising a first iron core (2) for a first lead wire (1) to penetrate through, a second iron core (4) for a second lead wire (3) to penetrate through, a first resistor (6) and a second resistor (7);
a coil AB (5) is wound on the first iron core (2); one end of the coil AB (5), the first resistor (6) and the other end of the coil AB (5) are electrically connected in sequence;
a coil CD (8) is wound on the second iron core (4); one end of the coil CD (8), the second resistor (7) and the other end of the coil CD (8) are electrically connected in sequence, wherein the second iron core (4) and the first iron core (2) are identical in size and structure; the turns of the coil CD (8) and the turns of the coil AB (5) are completely the same; the second resistor (7) and the first resistor (6) have the same resistance;
the directions of the 25Hz current and the 3000Hz current which respectively flow through the first lead wire (1) and the second lead wire (3) are opposite, and the directions of the 50Hz current which respectively flow through the first lead wire (1) and the second lead wire (3) are the same; the measuring device comprises a first lead wire (1), a second lead wire (3), a coil AB (5), a coil CD (8), a first iron core (2), a second iron core (4), a coil CD (8), a first iron core (1), a second lead wire (3), a second iron core (2), a third iron core (3), a fourth iron.
2. The track equidirectional current difference transformer according to claim 1, wherein the current value of 50Hz current is 0-500A; the current values of 25Hz current and 3000Hz current are 0-2A.
3. A track homodromous current difference transformer according to claim 1, characterised in that a plurality of groups of first lead wires (1) are run through one and the same first core (2); the directions of 50Hz currents flowing on the multiple groups of first lead wires (1) are the same, and the flow directions of 25Hz currents and 3000Hz currents flowing on the multiple groups of first lead wires (1) are the same;
a plurality of groups of second lead wires (3) penetrate through the same second iron core (4); the directions of 50Hz currents flowing on the multiple groups of second lead wires (3) are the same, the directions of the 50Hz currents flowing on the multiple groups of second lead wires (3) are the same as the directions of the 50Hz currents flowing on the multiple groups of first lead wires (1), the directions of the 25Hz currents and the 3000Hz currents flowing on the multiple groups of second lead wires (3) are the same, and the directions of the 25Hz currents and the 3000Hz currents flowing on the multiple groups of second lead wires (3) are opposite to the directions of the 25Hz currents and the 3000Hz currents flowing on the multiple groups of first lead wires (1).
4. A rail homonymous current difference transformer according to claim 1, characterized in that the coil AB (5) and the coil CD (8) are electrically connected at their opposite ends, and the other end of the coil AB (5) and the other end of the coil CD (8) constitute measuring ends for measuring the sum of the currents at 50Hz in the first lead wire (1) and the second lead wire (3) and for measuring the difference between the currents at 25Hz and 3000Hz in the first lead wire (1) and the second lead wire (3).
5. A rail homodromous current difference transformer according to claim 1, characterized by further comprising a third core (10) for passing a third lead wire (9), a third resistor, a fourth resistor and a fourth core (13) for passing a fourth lead wire (12); the first iron core (2), the second iron core (4), the third iron core (10) and the fourth iron core (13) are distributed side by side;
a coil EF is wound on the third iron core (10); one end of the coil EF, the third resistor and the other end of the coil EF are electrically connected in sequence;
a coil GH is wound on the fourth iron core (13); one end of the coil GH, the fourth resistor and the other end of the coil GH are electrically connected in sequence;
the directions of 25Hz current and 3000Hz current respectively flowing through the first lead wire (1) and the second lead wire (3) are the same, the directions of 25Hz current and 3000Hz current respectively flowing through the third lead wire (9) and the fourth lead wire (12) are the same, and the directions of the 25Hz current and 3000Hz current respectively flowing through the third lead wire (9) and the fourth lead wire (12) are opposite to the directions of the 25Hz current and 3000Hz current respectively flowing through the first lead wire (1) and the second lead wire (3); the directions of 50Hz currents respectively flowing through the first lead wire (1), the second lead wire (3), the third lead wire (9) and the fourth lead wire (12) are the same;
under the state that a first lead wire (1), a second lead wire (3), a third lead wire (9) and a fourth lead wire (12) are respectively communicated with 50Hz current, an end A, an end C, an end E and an end G in a coil AB (5), a coil CD (8), a coil EF and a coil GH are marked as ends with the same name and are sequentially connected with an end A, an end D, an end E and an end H, and the end B and the end H form a measuring end used for measuring the difference value of the 50Hz current in the first lead wire (1), the second lead wire (3), the third lead wire (9) and the fourth lead wire (12) and measuring the sum value of the 25Hz current in the first lead wire (1), the second lead wire (3), the third lead wire (9) and the fourth lead wire (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021689425.5U CN212570694U (en) | 2020-08-13 | 2020-08-13 | Rail homodromous current difference transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021689425.5U CN212570694U (en) | 2020-08-13 | 2020-08-13 | Rail homodromous current difference transformer |
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| Publication Number | Publication Date |
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| CN212570694U true CN212570694U (en) | 2021-02-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021689425.5U Active CN212570694U (en) | 2020-08-13 | 2020-08-13 | Rail homodromous current difference transformer |
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| Country | Link |
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| CN (1) | CN212570694U (en) |
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2020
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