CN111693769A - Electric energy meter - Google Patents
Electric energy meter Download PDFInfo
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- CN111693769A CN111693769A CN201910201081.4A CN201910201081A CN111693769A CN 111693769 A CN111693769 A CN 111693769A CN 201910201081 A CN201910201081 A CN 201910201081A CN 111693769 A CN111693769 A CN 111693769A
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- 238000012360 testing method Methods 0.000 claims abstract description 3
- 238000005070 sampling Methods 0.000 claims description 99
- 238000001514 detection method Methods 0.000 claims description 14
- 238000005452 bending Methods 0.000 claims description 10
- 238000003466 welding Methods 0.000 claims description 8
- 238000005259 measurement Methods 0.000 abstract description 8
- 230000005291 magnetic effect Effects 0.000 description 47
- 238000004804 winding Methods 0.000 description 5
- 230000007935 neutral effect Effects 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 230000006698 induction Effects 0.000 description 3
- 230000001012 protector Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000896 Manganin Inorganic materials 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010616 electrical installation Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
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Abstract
The invention relates to an electric energy meter, which comprises a shell, a wiring terminal seat detachably connected with the bottom of the shell, and a residual current transformer, a relay, a shunt and a main board which are arranged in the shell, wherein the residual current transformer, the relay, the shunt and the main board are arranged in the shell; the current divider samples the voltage and/or current flowing through the phase line in real time; the residual current transformer samples the voltage and/or current flowing through the zero line in real time; the current divider and the residual current transformer feed back a test result to the main board; the relay controls the on-off of the phase line according to the instruction of the main board. Compared with the prior art, the invention has the advantages that: the residual electric quantity of the measurement user can be detected in real time, so that the electric leakage risk is detected, discharged and early warned, and the power utilization safety degree of the user is improved.
Description
Technical Field
The invention relates to the field of electric energy meters, in particular to an electric energy meter capable of detecting electric leakage risks.
Background
The residual current is the current with the sum of phase current vectors of all phases in the distribution line being not zero, and is caused by the electric leakage of equipment or lines under most conditions, and the electric equipment or lines can be burnt out when the electric leakage is serious, so that fire is caused. Therefore, residual current detection and residual current operated protectors are installed in the low-voltage power grid, and the protection device is an effective protection measure for preventing personal electric shock, electric fire and damage of electric equipment. The residual current operated protectors are widely popularized and used in low-voltage power grids by establishing corresponding electrical installation regulations and electricity utilization regulations of countries and international electrotechnical committees in the world. However, the residual current protector can only perform tripping protection when the residual current has an overrun fault, and cannot perform early warning and real-time monitoring.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention discloses an electric energy meter capable of detecting the electric leakage risk.
The invention is realized by the following technical scheme:
an electric energy meter comprises a shell, a wiring terminal seat connected with the bottom of the shell, and a residual current transformer, a relay, a shunt and a mainboard which are arranged in the shell; the current divider samples the voltage and/or current flowing through the phase line in real time; the residual current transformer samples the voltage and/or current flowing through the zero line in real time; the current divider and the residual current transformer feed back a test result to the main board; the relay controls the on-off of the phase line according to the instruction of the main board.
Furthermore, the mainboard is arranged above the residual current transformer and the relay and is parallel to the sampling resistance sheet of the shunt.
Furthermore, a first connecting terminal and a second connecting terminal are arranged on the connecting terminal base; the first wiring terminal is directly connected with the relay through the shunt; and the second wiring terminal is directly connected with the relay through a third conducting strip.
Furthermore, the shunt comprises a first conducting strip, a second conducting strip and a sampling resistance card fixedly arranged between the first conducting strip and the second conducting strip; the horizontal arm of the first conducting strip is electrically connected with the first wiring terminal through a screw, and the vertical arm of the first conducting strip is fixedly connected with the first end of the sampling resistance card; the vertical arm of the second conducting strip is fixedly connected with the second end of the sampling resistance piece, and the horizontal arm of the second conducting strip is electrically connected with the contact of the relay.
Furthermore, the first bending arm of the third conducting strip is electrically connected with the second wiring terminal, the second bending arm of the third conducting strip is electrically connected with the relay, and the horizontal arm of the third conducting strip is coplanar with the sampling resistor disc.
Furthermore, a first phase line sampling pin and a second phase line sampling pin of the sampling resistor disc are respectively positioned on diagonal lines of the sampling resistor disc; and the pin of the sampling resistance chip is arranged at a position close to the first phase line sampling pin.
Furthermore, a detection pin is arranged on the third conducting strip; the detection pins vertically extend upwards from the horizontal arms of the third conducting strips, extend into the rectangular through holes in the corresponding positions of the mainboard and are connected with the mainboard in a welding mode.
Furthermore, the first phase line sampling pin, the second phase line sampling pin and the pins vertically extend upwards from the sampling resistor sheet, extend into the rectangular through holes in the corresponding positions of the mainboard and are connected with the mainboard in a welding mode.
Furthermore, the detection foot consists of a first cylinder and a second cylinder which are integrally formed; the second column body extends into the rectangular through hole in the corresponding position of the main board, and the bottom surface of the main board is in parallel contact with the top surface of the first column body.
Furthermore, the first phase line sampling pin, the second phase line sampling pin and the pin are composed of a first cylinder and a second cylinder which are integrally formed; the second column body extends into the rectangular through hole in the corresponding position of the main board, and the bottom surface of the main board is in parallel contact with the top surface of the first column body.
Further, the second column is located at the center of the first column, and the area of the cross section of the second column in the horizontal direction is smaller than the area of the cross section of the first column in the horizontal direction.
Furthermore, a wire guide plate is arranged between the residual current transformer and the main board.
Furthermore, the wire guide plate is provided with a transverse annular groove and a longitudinal groove which are tangent.
Furthermore, the wire guide plate is provided with a tangential transverse annular groove and a tangential longitudinal groove which are respectively provided with a cylindrical wire positioning column.
Furthermore, wires extending out of the first zero line sampling pin and the second zero line sampling pin extend out of the longitudinal groove along two ends of the transverse annular groove respectively, and are crossed and converged at the tangent point of the transverse annular groove and the longitudinal groove, after the crossing and convergence, the wires extending out of the first zero line sampling pin and the second zero line sampling pin continue to extend out of two ends of the longitudinal groove respectively, and are wound after being converged again finally, and are electrically connected with the main board.
Further, residual current transformer still includes the magnetic screen subassembly that can shield stray magnetic field, the cladding of magnetic screen subassembly is in residual current transformer's magnetic core and measurement coil's outside.
Further, the magnetic shield assembly includes a magnetic shield case and a balance coil wound outside the magnetic shield case.
Further, the magnetic shield box includes an upper cover and a lower cover which are closed with each other. The balance coil comprises a left balance coil and a right balance coil; the upper cover and the lower cover jointly surround an inner cavity which can be used for placing a magnetic core and a measuring coil for accommodating a residual current transformer; the left balance coil and the right balance coil are respectively wound on the left side and the right side of the magnetic shielding box. The left balance coil and the right balance coil are opposite in winding direction, the number of turns and winding specifications are the same, and the left balance coil and the right balance coil are connected in parallel.
Compared with the prior art, the invention has the advantages that: firstly, the method can detect the residual electric quantity of a measuring user in real time, so that the leakage risk is detected, discharged and early warned, and the power utilization safety degree of the user is improved; secondly, the structure that the mainboard and the wires are fixed by a buckle, a supporting column and the like in the electric energy meter is omitted by omitting a wire structure of the phase wire, so that the mainboard is convenient to mount and fix and is convenient to weld with other elements; finally, the invention particularly weakens the magnetic field interference caused by the unfixed problem of the wiring of the lead, and improves the measurement accuracy of the electric energy meter.
Drawings
FIG. 1: the invention relates to a perspective view of an electric energy meter in a first direction;
FIG. 2: the invention discloses a perspective view of an electric energy meter in a second direction;
FIG. 3: the invention discloses a partial enlarged view of a wire guide plate of an electric energy meter.
FIG. 4: the invention discloses a partial enlarged view of a current divider of an electric energy meter.
FIG. 5: the invention discloses a structural schematic diagram of a residual current transformer of an electric energy meter.
FIG. 6: the invention discloses a schematic cross section diagram of a magnetic core of a residual current transformer of an electric energy meter.
A shell-1; residual current transformer-3; a relay-4; a shunt-5; a third conductive sheet-7; a main board-8; a wiring terminal-9; a first connecting terminal-10; a second wiring terminal-11; a third wiring terminal-12; a fourth connecting terminal-14; a magnetic shield assembly-17; an upper cover-18; a lower cover-19; a left balance coil-20; a right balance coil-21; a magnetic shield case-22; a balance coil-23; a first conductive sheet-24; a second conductive sheet-25; sampling a resistor disc-26; a first phase line sampling pin-27; a second phase line sampling pin-28; pin-29; detecting a pin-30; first neutral sampling pin-33: a second neutral sampling pin-34; a voltage sampling pin-35; a wire guide plate-36; transverse annular groove-37; a longitudinal groove-38; a wire positioning post-39, a first post-C1; second column-C2.
Detailed Description
The invention provides an electric energy meter which comprises a shell 1, a residual current transformer 3, a relay 4, a shunt 5 and a mainboard 8.
The wiring terminal seat sets up in the bottom of casing 1, and residual current transformer 3, relay 4, shunt 5, mainboard 8 install in the inside of casing 1. The main board 8 is arranged above the residual current transformer 3 and the relay 4, and is parallel to the sampling resistance sheet 26 of the shunt 5. The contact of the relay 4 controls the on-off of the phase line. The residual current transformer 3 is arranged close to the phase line and the zero line, and the phase line and the zero line penetrate through the residual current transformer 3.
The wiring terminal seat is provided with four binding post 9 that set up side by side, and inside binding post 9's one end stretched into casing 1, the other end stretched out casing 1 outside, and binding post 9 includes first binding post 10, second binding post 11, third binding post 12, fourth binding post 14. The current entering the phase line from the first connecting terminal 10 flows through the current divider 5, the relay 4 and the residual current transformer 3 in sequence and then flows out from the second connecting terminal 11. The current enters from the third connecting terminal 12, and flows out from the fourth connecting terminal 14 after flowing through the residual current transformer 3.
The sampling resistor disc 26 is provided with a first phase line sampling pin 27, a second phase line sampling pin 28 and a pin 29. A detection pin 30 is arranged between the relay 4 and the second wiring terminal 11. The first phase line sampling pin 27, the second phase line sampling pin 28, the pin 29 and the detection pin 30 are fixedly connected with the mainboard 8 through welding and other modes. And the coil input end and the coil output end of the relay 4 are respectively and electrically connected with the main board 8 through leads. And a first zero line sampling pin 33, a second zero line sampling pin 34 and a voltage sampling pin 35 are arranged on the residual current transformer 3, and the first zero line sampling pin 33, the second zero line sampling pin 34 and the voltage sampling pin 35 are electrically connected with the mainboard 8 through wires.
The residual current transformer 3 is used for measuring residual current; the relay 4 is used for controlling the on-off of the phase line 15; the current divider 5 is used for sampling the voltage and/or current flowing through the phase line 15 in real time; the mainboard 8 firstly amplifies the output signal of the residual current transformer 3, then the mainboard 8 compares the output signal of the residual current transformer 3 amplified by the amplifier 6 with a preset threshold value and outputs a comparison result signal, and finally the mainboard 8 controls the connection or disconnection of the relay 4 according to the comparison result signal.
The first end of the phase line is electrically connected with the first connecting terminal 10, and the second end of the phase line is electrically connected with the second connecting terminal 11; a first end of the neutral wire is electrically connected to the third connection terminal 12, and a second end of the neutral wire is electrically connected to the fourth connection terminal 14. The shunt 5 is provided on the phase line between the contact of the relay 4 and the first connection terminal 10, or the present invention may omit the wires between the first connection terminal 10 and the contact of the relay 4, directly connect the first connection terminal 10 and the contact of the relay 4 using the shunt 5, and omit the wires between the relay 4 and the second connection terminal 11, directly connect the contact of the relay 4 and the second connection terminal 11 using the third conductive sheet 7. The shunt 5 may be a manganin shunt.
The electric energy meter can detect the residual electric quantity of a user in real time, so that the electric leakage risk is detected, discharged and early warned, and the power utilization safety degree of the user is improved. The specific principle of the invention is as follows: after the electric energy meter is adopted, the main board 8 controls the relay 4 according to whether the residual current value exceeds a preset threshold value. When the residual current value does not exceed the preset threshold value main board 8, the relay 4 is not switched off; when the residual current value exceeds a preset threshold value, the main board 8 controls the relay 4 to disconnect the phase line. Therefore, the invention can detect the residual current in the user power supply system in real time, carry out corresponding protection and early warning operation once the residual current exceeds the threshold value, and improve the power utilization safety degree of the user by checking the electric leakage risk in real time and actively.
In some embodiments of the present invention, the first connection terminal 10 and the contact of the relay 4 may be directly connected by the shunt 5, and the contact of the relay 4 and the second connection terminal 11 may be directly connected by the third conductive sheet 7. Specifically, the shunt 5 includes a first conductive strip 24, a second conductive strip 25, and a sampling resistor disc 26 disposed between the first conductive strip 24 and the second conductive strip 25, where two ends of the sampling resistor disc 26 are respectively fixedly connected to the first conductive strip 24 and the second conductive strip 25 by welding. The first conductive plate 24 and the second conductive plate 25 have L-shaped structures respectively formed by a horizontal arm and a vertical arm which are perpendicular to each other. The horizontal arm of the first conductive plate 24 is electrically connected with the first connection terminal 10 through a screw, and the vertical arm of the first conductive plate 24 vertically extends upwards along the horizontal arm of the first conductive plate 24 and is fixedly connected with the first end of the horizontally arranged sampling resistance sheet 26. The vertical arm of the second conducting strip 25 is fixedly connected with the second end of the sampling resistor disc 26, and the horizontal arm of the second conducting strip 25 is perpendicular to the vertical arm and is electrically connected with the contact of the relay 4. The first and second L-shaped conductive strips 24 and 25 have a vertical arm at one end vertically connected to the sampling resistor 26, and a horizontal arm at one end vertically connected to the vertical arm and parallel to the sampling resistor 26. The third conducting strip 7 connects the second connecting terminal 11 and the relay 4 with each other, the third conducting strip 7 includes a first bending arm, a second bending arm and a horizontal arm between the first bending arm and the second bending arm, the first bending arm is electrically connected with the second connecting terminal 11, the second bending arm is electrically connected with the relay 4, and the horizontal arm of the third conducting strip 7 is coplanar with the sampling resistance sheet 26.
The sampling resistor disc 26 is provided with a first phase line sampling pin 27, a second phase line sampling pin 28 and a pin 29. And a detection pin 30 is arranged on the horizontal arm of the third conducting strip 7. And a first zero line sampling pin 33, a second zero line sampling pin 34 and a voltage sampling pin 35 are arranged on the residual current transformer 3. The sampling resistor disc 26 is substantially rectangular, and the first phase line sampling pin 27 and the second phase line sampling pin 28 are located on the diagonal of the rectangular sampling resistor disc 26 respectively. The first phase line sampling pin 27 is disposed at an end close to the first conductive plate 24, and the second phase line sampling pin 28 is disposed at an end close to the second conductive plate 25. Pin 29 is disposed adjacent to first phase sampling pin 27.
The first phase line sampling pin 27, the second phase line sampling pin 28 and the pin 29 all extend upward from the sampling resistor disc 26, and the detection pin 30 extends upward from the horizontal arm of the third conductive plate 7. And the first zero line sampling pin 33, the second zero line sampling pin 34 and the voltage sampling pin 35 vertically extend upwards from the residual current transformer 3.
First phase line sampling foot 27, second phase line sampling foot 28, pin 29 and detection foot 30 and voltage sampling foot 35 all stretch into the rectangle through-hole on the mainboard 8 relevant position, run through behind the mainboard 8, through modes such as welding, with mainboard 8 signal connection.
The first phase line sampling pin 27, the second phase line sampling pin 28, the pin 29, the detection pin 30 and the voltage sampling pin 35 have the same shape and size, and are respectively composed of a first cylinder C1 and a second cylinder C2 which are integrally formed. The first column C1 is far from the main board 8, and the second column C2 is close to the main board 8. The second cylinder C2 is located at the center of the first cylinder C1, and the area of the horizontal cross section of the second cylinder C2 is smaller than that of the first cylinder C1. Through the structure, during installation and assembly, the second column C2 passes through the through hole at the corresponding position on the main board 8 and then is welded, so that the main board 8 can be stably supported by the first phase line sampling pin 27, the second phase line sampling pin 28, the pin 29, the detection pin 30 and the voltage sampling pin 35, and is kept parallel to the plane of the sampling resistor sheet 26.
The reason for adopting the above structure is that: by adopting the conducting strip to replace a soft and unfixed copper conductor, the voltage resistance problem and the magnetic field interference problem caused by the fact that messy conductors touch other electrical elements can be avoided. Secondly, through the structure of first cylinder C1 and second cylinder C2 for mainboard 8 can carry out effective stable fixed, has made things convenient for the welding promptly, has omitted structures that inside buckle, support column etc. of electric energy meter carry out fixing to mainboard and wire again. Particularly, when the main board 8 is welded directly above the sampled resistor disc 26 in parallel, the annular area of the closed loop formed by connecting the sampled resistor disc 26 with the main board 8 is significantly reduced, thereby further avoiding the influence of magnetic field interference on the measurement accuracy.
In some embodiments of the present invention, a wire guide 36 is further provided between the residual current transformer 3 and the main board 8. The wire guide plate 36 guides the wires extending from the first zero line sampling pin 33 and the second zero line sampling pin 34, so that the wires are wound in a crossed and reverse manner on the same plane to form an envelope coil area with the same value and an opposite envelope coil direction, so that opposite mutual induction currents are generated, the directions of magnetic fluxes through which the two induction currents pass are coplanar and opposite in direction, and the two induction currents are offset with each other, so that magnetic field interference caused by difficulty in controlling the directions of the wires is eliminated. In particular, the wire guide plate 36 is provided with a tangential transverse annular groove 37 and a tangential longitudinal groove 38. The wire guide plate is provided with a tangential transverse annular groove and a tangential longitudinal groove which are respectively provided with a cylindrical wire positioning column 39. The wires extending out of the first zero line sampling pin 33 and the second zero line sampling pin 34 respectively extend out of the longitudinal groove 38 along the edges of the two ends of the transverse annular groove 37, and are crossed and converged at the tangent point of the transverse annular groove 37 and the longitudinal groove 38, after the crossing and convergence, the wires extending out of the first zero line sampling pin 33 and the second zero line sampling pin 34 respectively continue to extend out of the edges of the two ends of the longitudinal groove 38, and are finally converged again and then wound with each other and electrically connected with the main board 8, wherein the wire positioning column 3 can fix the wires, so that the wires are always routed along the edges of the annular grooves, and the wires extending out of the first zero line sampling pin 33 and the second zero line sampling pin 34 are ensured to be crossed and reversely wound on the same plane to form the same-value enveloping coil area.
The invention has no special limitation on the specification and model of the residual current transformer 3, and can realize the purpose of measuring the residual current. The residual current transformers of the prior art generally comprise a rectangular magnetic core, around the outer periphery of which the measuring coil is uniformly wound. However, when a large current conductor or a ferromagnetic substance exists near the residual current transformer in the prior art, a large stray magnetic field is generated near the residual current transformer, the symmetry of the whole magnetic field is damaged, and a pseudo residual current is generated. The generation of false residual currents can cause inaccuracies in the measurement and lead to incorrect operation of the relay. Therefore, in order to solve the above problem, in some embodiments of the present invention, the residual current transformer 3 further includes a magnetic shielding assembly 17 capable of shielding a stray magnetic field, and the structure and principle of the magnetic shielding assembly 17 are as follows.
The residual current transformer 3 comprises a magnetic core with a rectangular frame structure, and the measuring coil is uniformly wound on the outer periphery of the magnetic core. In order to shield stray magnetic fields, the magnetic shielding assembly 17 is adopted in the embodiment of the invention to be coated outside the magnetic core and the measuring coil of the residual current transformer 3. Specifically, the magnetic shield assembly 17 includes a magnetic shield case 22 and a balance coil 23 wound outside the magnetic shield case 22, and the magnetic shield case 22 includes an upper cover 18 and a lower cover 19 which are covered with each other. The balance coil 23 includes a left balance coil 20 and a right balance coil 21. The lower cover 19 includes a bottom wall having a rectangular frame structure, an inner side wall vertically extending upward along an inner peripheral edge of the bottom wall of the rectangular frame structure, and an outer side wall vertically extending upward along an outer peripheral edge of the bottom wall of the rectangular frame structure, and the upper cover 18 has the same shape as the bottom wall having the rectangular frame structure and covers upper ends of the inner side wall and the outer side wall. The upper cover 18 and the lower cover 19 thus together enclose an inner cavity in which the magnetic core and the measuring coil accommodating the residual current transformer 3 can be placed. The magnetic shield case 22 is made of a magnetic shield material, and after the upper cover 18 and the lower cover 19 are closed, the magnetic shield case 22 is wound with a yellow wax tape to complete sealing. The left balance coil 20 and the right balance coil 21 are wound on the left and right sides of the magnetic shield case 22, respectively. The left balance coil 20 and the right balance coil 21 are opposite in winding direction, the number of turns and the winding specification are the same, and the left balance coil 20 and the right balance coil 21 are connected in parallel. First, the magnetic shield box 22 can substantially shield the generated stray magnetic field from the internal measurement coil from the external stray magnetic field to generate a pseudo residual current. Secondly, although the electromotive forces induced in the same magnetic field by the left balance coil 20 and the right balance coil 21 are equal and opposite in direction and are exactly cancelled, the directions of the stray magnetic fields are disordered and have no fixed direction, so that the electromotive forces induced in the left balance coil 20 and the right balance coil 21 cannot be completely cancelled, and certain induced currents are induced, and the magnetic field of the induced currents is opposite to the direction of the original magnetic field, so that the residual external stray magnetic fields are balanced. Finally, because the left balance coil 20 and the right balance coil 21 have the same number of turns and opposite winding directions, when a true residual current is encountered, the electromotive forces induced in the left balance coil 20 and the right balance coil 21 have the same value and opposite directions, and are completely counteracted, so that the measurement accuracy of the residual current transformer 3 is not influenced. Through the structure, the embodiment can ensure the measurement accuracy and precision even if the residual current transformer 3 is under the interference of a stray magnetic field.
It is obvious that the above embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, those skilled in the art should also include various changes, modifications, substitutions and improvements without creative efforts to the embodiments.
Claims (10)
1. An electric energy meter, characterized by: the residual current transformer comprises a shell (1), a wiring terminal base connected with the bottom of the shell (1), and a residual current transformer (3), a relay (4), a shunt (5) and a main board (8) which are arranged in the shell (1); the current divider (5) samples the voltage and/or current flowing through the phase line in real time; the residual current transformer (3) samples the voltage and/or current flowing through the zero line in real time; the shunt (5) and the residual current transformer (3) feed back a test result to the main board (8); the relay (4) controls the on-off of the phase line (15) according to the instruction of the main board (8).
2. The electric energy meter of claim 1, wherein: the main board (8) is arranged above the residual current transformer (3) and the relay (4) and is parallel to the sampling resistance sheet (26) of the shunt (5).
3. The electric energy meter of claim 1, wherein: the wiring terminal base is provided with a first wiring terminal (10) and a second wiring terminal (11); the first connecting terminal (10) is directly connected with the relay (4) through a shunt (5); and the second connecting terminal (11) is directly connected with the relay (4) through a third conducting strip (7).
4. An electric energy meter according to claim 3, characterized in that: the shunt (5) comprises a first conducting strip (24), a second conducting strip (25) and a sampling resistor disc (26) fixedly arranged between the first conducting strip (24) and the second conducting strip (25); the horizontal arm of the first conducting strip (24) is electrically connected with the first wiring terminal (10) through a screw, and the vertical arm of the first conducting strip (24) is fixedly connected with the first end of the sampling resistance card (26); the vertical arm of the second conducting strip (25) is fixedly connected with the second end of the sampling resistor disc (26), and the horizontal arm of the second conducting strip (25) is electrically connected with the contact of the relay (4).
5. An electric energy meter according to claim 3, characterized in that: the first bending arm of the third conducting strip (7) is electrically connected with the second wiring terminal (11), the second bending arm of the third conducting strip (7) is electrically connected with the relay (4), and the horizontal arm of the third conducting strip (7) is coplanar with the sampling resistor disc (26).
6. An electric energy meter according to claim 3, characterized in that: a first phase line sampling pin (27) and a second phase line sampling pin (28) of the sampling resistor disc (26) are respectively positioned on the diagonal lines of the sampling resistor disc (26); and a pin (29) of the sampling resistor disc (26) is arranged at a position close to a first phase line sampling pin (27).
7. The electric energy meter of claim 5, wherein: a detection pin (30) is arranged on the third conducting strip (7); the detection pins (30) vertically extend upwards from the horizontal arms of the third conducting strips (7), extend into the rectangular through holes in the corresponding positions of the main board (8), and are connected with the main board (8) in a welding mode.
8. The electric energy meter of claim 6, wherein: the first phase line sampling pin (27), the second phase line sampling pin (28) and the pin (29) vertically extend upwards from the sampling resistor disc (26), extend into the rectangular through hole in the corresponding position of the mainboard (8), and are connected with the mainboard (8) in a welding mode.
9. The electric energy meter of claim 7, wherein: the detection foot (30) is composed of a first cylinder (C1) and a second cylinder (C2) which are integrally formed; the second column (C2) extends into the rectangular through hole at the corresponding position of the main board (8), and the bottom surface of the main board (8) is in parallel contact with the top surface of the first column (C1).
10. The electric energy meter of claim 8, wherein: the first phase line sampling pin (27), the second phase line sampling pin (28) and the pin (29) are formed by a first cylinder (C1) and a second cylinder (C2) which are integrally formed; the second column (C2) extends into the rectangular through hole at the corresponding position of the main board (8), and the bottom surface of the main board (8) is in parallel contact with the top surface of the first column (C1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910201081.4A CN111693769A (en) | 2019-03-15 | 2019-03-15 | Electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910201081.4A CN111693769A (en) | 2019-03-15 | 2019-03-15 | Electric energy meter |
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|---|---|
| CN111693769A true CN111693769A (en) | 2020-09-22 |
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| CN201910201081.4A Pending CN111693769A (en) | 2019-03-15 | 2019-03-15 | Electric energy meter |
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| CN103926458A (en) * | 2014-04-30 | 2014-07-16 | 厦门宏发电力电器有限公司 | Electronic energy meter, diverter of electronic energy meter, sampling resistor disc and method for offsetting alternating magnetic field interference of circuit board |
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| CN204405734U (en) * | 2015-02-03 | 2015-06-17 | 南京天溯自动化控制系统有限公司 | A kind of electric energy meter with residual current detection function |
| CN204649834U (en) * | 2015-04-28 | 2015-09-16 | 吴京蓁 | A kind of integral and intelligent electric energy meter with leakage current monitoring and protecting function |
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