CN209821271U - Multipurpose current transformer capable of being provided with Rogowski coil - Google Patents
Multipurpose current transformer capable of being provided with Rogowski coil Download PDFInfo
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- CN209821271U CN209821271U CN201920065728.0U CN201920065728U CN209821271U CN 209821271 U CN209821271 U CN 209821271U CN 201920065728 U CN201920065728 U CN 201920065728U CN 209821271 U CN209821271 U CN 209821271U
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Abstract
The utility model discloses a multipurpose current transformer capable of being provided with Rogowski coil, which comprises a base, an insulating shell, fixing bolts, a current input port, a measuring area, an inner core, a current output port and a measuring instrument, wherein the insulating shell is arranged on the base, two sides of the top end of the insulating shell are fixed by the fixing bolts, the current input port is arranged below the middle part of the two fixing bolts, the central hollow area of the insulating shell is the measuring area, the inner core is arranged in the insulating shell outside the measuring area, the upper end of the coil at the foremost side is connected with the current input port through a wire, the part of the rear end of the base, which is close to the insulating shell, is provided with the current output port, the current output port is connected with the measuring instrument through a wire, by additionally arranging a Rogowski coil measuring system at the upper end of the insulating shell, the problem that the, the measured current is reduced according to a certain transformation ratio, and the measuring instrument is prevented from being burnt due to overlarge current.
Description
Technical Field
The utility model relates to a current measurement technical field specifically is a multi-purpose current transformer of mountable luo shi coil.
Background
The Rogowski coil is called a current measuring coil and a differential current sensor and is mainly used for measuring alternating current, the working principle of the Rogowski coil is that a coil framework surrounds a measured conductor, a magnetic field around the conductor changes along with the change of current in the conductor, and an enameled wire on the framework induces electromotive force. According to the mathematical derivation, the electromotive force is in direct proportion to the derivative of the current in the conductor, the proportionality coefficient is related to the number of turns of the coil, the cross section of the framework, the magnetic conductance rate and the like, the electromotive force is integrated to reduce the current in the conductor, the Rogowski coil is a ring coil uniformly wound on a non-ferromagnetic material, the output signal is the differential of the current to the time, the input current can be really reduced through a circuit for integrating the output voltage signal, the coil has the characteristics of real-time current measurement, high response speed and no saturation, is suitable for alternating current, particularly high-frequency heavy current measurement, the prior art electrical measurement instrument comprises a current transformer and a voltage transformer which have larger volume, when the current and the voltage of a copper bar and other specific areas need to be measured, the accurate measurement cannot be realized due to the volume problem, and the Rogowski coil can be subjected to the excessive measured current when, thereby burning the measuring instrument.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a multi-purpose current transformer of mountable luo shi coil, through install luo shi coil survey system additional in insulating casing upper end, solve because under the special space unable measurement or the testee less lead to measuring inaccurate, through set up the three-layer winding coil in current transformer, effectively will be surveyed the current and reduce to certain extent according to certain transformation ratio, can solve the problem among the prior art.
In order to achieve the above object, the utility model provides a following technical scheme:
a multipurpose current transformer capable of being provided with a Rogowski coil comprises a base, an insulating shell, a fixing bolt, a current input port, a measuring area, an inner core, a current output port and a measuring instrument, an insulating shell is arranged on the base, two sides of the top end of the insulating shell are fixed by fixing bolts, a current input port is arranged below the middle part of each fixing bolt, the central hollow area of the insulating shell is a measuring area, an inner core is arranged in the insulating shell outside the measuring area, an iron core is arranged in the middle of the inner core, a coil is wound on the outer side of the iron core, and covers the iron core, the upper end of the coil at the foremost side is connected with the current input port through a lead, a current output port is arranged at the part, close to the insulating shell, of the rear end of the base, the coil on the last side is connected with the current output port through a lead, and the current output port is connected with a measuring instrument through a lead;
the current input port comprises a Rogowski coil, connectors, an integrator and a socket, the socket is arranged at the current input port and is connected with the integrator through a lead, two connectors are arranged at the rear end of the integrator, and the connectors are connected with the Rogowski coil through leads;
the measuring apparatu includes display screen, operating button, high voltage binding post, low pressure binding post, prints mouth and power socket, the upper left side of measuring apparatu panel is the display screen, the display screen below is equipped with operating button, the right-hand member of display screen is equipped with high voltage binding post, high voltage binding post's below is equipped with low pressure binding post, the part that is close to operating button in low pressure binding post below is equipped with power socket, power socket's right side is equipped with prints the mouth.
Preferably, the number of turns of the coil increases from outside to inside.
Preferably, the current input range of the current input port is 20-6000A, the current output range of the current output port is 1-5A, and the maximum withstand voltage of the current transformer is 1 KV.
Preferably, the transformation ratio of the Rogowski coil is 0.1-1V/kA, the maximum frequency is 5MHz, and the maximum input current is 100 KA.
Compared with the prior art, the beneficial effects of the utility model are as follows:
1. the utility model discloses mountable Rogowski coil's multi-purpose current transformer through adding the installation Rogowski coil, prescribes a limit to the size of testee and removes, when special measurement environment or special measurement space, measures through using the Rogowski coil, solves the testee undersize, perhaps appears by the special unable measuring condition that leads to of test environment.
2. The utility model discloses mountable Rogowski coil's multi-purpose current transformer because Rogowski coil's high accuracy nature, when survey electric current too big, enlargies once more through the integrator, probably leads to burning out the measuring instrument, sets for three side winding coils in with current transformer, because second side winding and third side winding coil number of turns are more, can reduce the electric current through certain transformation ratio effectively, reduce the electric current size through twice to accomplish the protection to the measuring instrument.
Drawings
Fig. 1 is a front sectional view of the present invention;
fig. 2 is a side sectional view of the present invention;
fig. 3 is a front view of the rogowski coil measuring end of the present invention;
FIG. 4 is a connection diagram of the inner core coil of the present invention;
fig. 5 is a front view of the measuring instrument of the present invention.
In the figure: 1. a base; 2. a housing; 3. fixing the bolt; 4. a current input port; 41. a Rogowski coil; 42. A joint; 43. an integrator; 44. a socket; 5. a measurement zone; 6. an inner core; 61. an iron core; 62. a coil; 7. a current output port; 8. a measuring instrument; 81. a display screen; 82. an operation button; 83. a high-voltage wiring terminal; 84. a low-voltage wiring terminal; 85. a printing port; 86. a power outlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-3, a multipurpose current transformer capable of mounting a rogowski coil comprises a base 1, an insulating shell 2, fixing bolts 3, a current input port 4, a measurement area 5, an inner core 6, a current output port 7 and a measuring instrument 8, wherein the insulating shell 2 is mounted on the base 1, the inner core 6 is isolated from the outside by the insulating shell 2, so that current loss caused by external factors is avoided, and measurement results are influenced, two sides of the top end of the insulating shell 2 are fixed by the fixing bolts 3, the current input port 4 is arranged below the middle parts of the two fixing bolts 3, the current input port 4 is mainly used for mounting rogowski coil 41 measurement systems of different specifications, the current input range of the current input port 4 is 20-6000A, the central hollow area of the insulating shell 2 is the measurement area 5, when a measured object is large in size and cannot be measured by the rogowski coil 41, the measured object can be directly placed in the measurement area, an inner core 6 is arranged in an insulating shell 2 outside a measuring area 5, an iron core 61 is arranged in the middle of the inner core 6, a coil 62 is arranged outside the iron core 61 and is wound to cover the iron core 61, the turns of the coil 62 are sequentially increased, wherein the turn of the outermost coil 62 is the least, the turn of the innermost coil 62 is the most, the outermost coil 62 and a measured current belong to a series connection relation, the current of the outermost coil 62 is larger, after passing through a secondary side winding and a tertiary side winding, due to the fact that the turns of the coil 62 are increased, direct current resistance in the coil 62 is increased, according to ohm's law, resistance increasing current is reduced, the innermost coil 62 is connected with a measuring instrument 8 in series, the current of a measured object is measured and calculated according to the turn ratio of the first side winding coil 62 and the third side winding coil 62, the upper end of the foremost coil 62 is connected with a current input port 4 through a lead, and the current, the measured current is directly input into the coil 62, flows out from the current output port 7 after passing through the third side winding, and is measured by the measuring instrument 8 to obtain a reading, the current output port 7 is arranged at the part, close to the insulating shell 2, of the rear end of the base 1, the current output port 7 is connected with the third side winding coil 62 and the measuring instrument 8 in series, the reading can be accurately measured, the current of the measured object is calculated through the turn ratio, the coil 62 on the last side is connected with the current output port 7 through a wire, the current output port 7 is connected with the measuring instrument 8 through a wire, the current output range of the current output port 7 is 1-5A, and the maximum withstand voltage of the current transformer is 1 KV.
Referring to fig. 4, a socket 44 is installed at the current input port 4, the socket 44 is connected to an integrator 43 through a wire, because the current measured by the rogowski coil 41 is sometimes small, the integrator 43 includes an amplifying circuit therein, the current to be measured is amplified according to a certain proportion, and then other interference is filtered through its internal capacitance, so that the amplified current to be measured is accurately input to the current input port 4, two connectors 42 are provided at the rear end of the integrator 43, the connectors 42 are connected to the rogowski coil 41 through wires, the rogowski coil 41 can be sleeved on the object to be measured according to the size of the object to be measured, and the alternating current of the object to be measured is measured, the transformation ratio of the rogowski coil 41 is 0.1-1V/kA, the maximum frequency is 5MHz, and the maximum input current is 100 kA.
Referring to fig. 5, a display screen 81 is arranged on the upper left of a panel of the measuring instrument 8, an operation button 82 is arranged below the display screen 81, the measuring instrument 8 can control the operation button 82 to adjust a transformation ratio of the current transformer, adjust a current change when a measured current passes through a third side winding by adjusting the transformation ratio, and calculate a correct reading by the transformation ratio, a high-voltage wiring terminal 83 is arranged at the right end of the display screen 81, the high-voltage wiring terminal 83 is connected when the measured current is higher, a low-voltage wiring terminal 84 is arranged below the high-voltage wiring terminal 83, the low-voltage wiring terminal 84 is connected when the measured current is lower, a power socket 86 is arranged below the low-voltage wiring terminal 84 and close to the operation button 82, a printing port 85 is arranged on the right side of the power socket 86.
The working principle is as follows: when the measured object is large, the measured object can be directly placed into the measuring area 5, and the alternating current change in the measured object causes a first side winding in the current transformer to generate current through electromagnetic induction; when the measured object is small or the measured object cannot be detached, and the measurement space is small, by additionally installing the rogowski coil 41 measurement system at the current input port 4, through the electromagnetic induction effect, the rogowski coil 41 is electrified and inputs the current to the integrator 43, the integrator 43 internally contains the amplifying circuit and the capacitor, the amplifying circuit amplifies the measured current to a certain value, then the amplifying circuit eliminates interference through the capacitor, and finally the amplified current is output to the current input port 4, the current to be measured is transmitted to the first side winding coil 62 at the current input port 4, the third side winding coil 62 is electrified and output to the current output port 7 through the electrical induction effect, because the number of turns of the first side winding coil 62 is small, the resistance is small, the number of turns of the third side winding coil 62 is large, the resistance is large, the current of the first side winding coil 62 is reduced to the third side winding coil 62 through a certain transformation ratio, and output to the measuring instrument 8, and the current of the measured object is calculated through the measuring instrument 8.
In summary, the following steps: the utility model discloses but the multi-purpose current transformer of roche coil of installation, when the measured object is great, can put into measuring area 5 with the measured object directly, the alternating current in the measured object changes and makes the first side winding among the current transformer produce the electric current through electromagnetic induction; when the measured object is small or the measured object cannot be detached, and the measurement space is small, by additionally installing the rogowski coil 41 measurement system at the current input port 4, through the electromagnetic induction effect, the rogowski coil 41 is electrified and inputs the current to the integrator 43, the integrator 43 internally contains the amplifying circuit and the capacitor, the amplifying circuit amplifies the measured current to a certain value, then the amplifying circuit eliminates interference through the capacitor, and finally the amplified current is output to the current input port 4, the current to be measured is transmitted to the first side winding coil 62 at the current input port 4, the third side winding coil 62 is electrified and output to the current output port 7 through the electrical induction effect, because the number of turns of the first side winding coil 62 is small, the resistance is small, the number of turns of the third side winding coil 62 is large, the resistance is large, the current of the first side winding coil 62 is reduced to the third side winding coil 62 through a certain transformation ratio and is output to the measuring, the current size of the measured object is calculated through the measuring instrument 8, and due to the fact that the Rogowski coil 41 is additionally arranged, the measuring operation can be conducted on objects different in size under special conditions, the size problem is effectively solved, and meanwhile, due to the high accuracy of the Rogowski coil 41, the current measurement on the measured object is more accurate.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides a multi-purpose current transformer of mountable rogowski coil, includes base (1), insulating casing (2), fixing bolt (3), current input port (4), measuring zone (5), inner core (6), current output port (7) and measuring apparatu (8), its characterized in that: an insulating shell (2) is arranged on the base (1), two sides of the top end of the insulating shell (2) are fixed by fixing bolts (3), a current input port (4) is arranged below the middle part of each of the two fixing bolts (3), the central hollow area of the insulating shell (2) is a measuring area (5), an inner core (6) is arranged in the insulating shell (2) at the outer side of the measuring area (5), the middle of the inner core (6) is provided with an iron core (61), the outer side of the iron core (61) is provided with a coil (62) wound, and covers the iron core (61), the upper end of the coil (62) at the foremost side is connected with the current input port (4) through a lead, a current output port (7) is formed in the part, close to the insulating shell (2), of the rear end of the base (1), the coil (62) on the last side is connected with the current output port (7) through a lead, and the current output port (7) is connected with a measuring instrument (8) through a lead;
the current input port (4) comprises a Rogowski coil (41), a joint (42), an integrator (43) and a socket (44), the socket (44) is installed at the current input port (4), the socket (44) is connected with the integrator (43) through a lead, two joints (42) are arranged at the rear end of the integrator (43), and the joints (42) are connected with the Rogowski coil (41) through leads;
measuring apparatu (8) include display screen (81), operating button (82), high voltage binding post (83), low pressure binding post (84), print mouth (85) and power socket (86), the upper left side of measuring apparatu (8) panel is display screen (81), display screen (81) below is equipped with operating button (82), the right-hand member of display screen (81) is equipped with high voltage binding post (83), the below of high voltage binding post (83) is equipped with low voltage binding post (84), the part that is close to operating button (82) below low voltage binding post (84) is equipped with power socket (86), the right side of power socket (86) is equipped with prints mouth (85).
2. The rogowski coil mountable multi-purpose current transformer of claim 1, wherein: the number of turns of the coil (62) is increased from outside to inside in sequence.
3. The rogowski coil mountable multi-purpose current transformer of claim 1, wherein: the current input range of the current input port (4) is 20-6000A, the current output range of the current output port (7) is 1-5A, and the maximum bearing voltage of the current transformer is 1 KV.
4. The rogowski coil mountable multi-purpose current transformer of claim 1, wherein: the transformation ratio of the Rogowski coil (41) is 0.1-1V/kA, the maximum frequency is 5MHz, and the maximum input current is 100 KA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920065728.0U CN209821271U (en) | 2019-01-10 | 2019-01-10 | Multipurpose current transformer capable of being provided with Rogowski coil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920065728.0U CN209821271U (en) | 2019-01-10 | 2019-01-10 | Multipurpose current transformer capable of being provided with Rogowski coil |
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| CN209821271U true CN209821271U (en) | 2019-12-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110967656A (en) * | 2019-12-31 | 2020-04-07 | 中国科学院合肥物质科学研究院 | High-precision sweep frequency type Rogowski coil mutual inductance calibration system and method |
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2019
- 2019-01-10 CN CN201920065728.0U patent/CN209821271U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110967656A (en) * | 2019-12-31 | 2020-04-07 | 中国科学院合肥物质科学研究院 | High-precision sweep frequency type Rogowski coil mutual inductance calibration system and method |
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