CN204614578U - Electric energy meter D.C. magnetic field generating means and interference test device - Google Patents
Electric energy meter D.C. magnetic field generating means and interference test device Download PDFInfo
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- CN204614578U CN204614578U CN201520110892.0U CN201520110892U CN204614578U CN 204614578 U CN204614578 U CN 204614578U CN 201520110892 U CN201520110892 U CN 201520110892U CN 204614578 U CN204614578 U CN 204614578U
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Abstract
The utility model discloses a kind of electric energy meter D.C. magnetic field generating means and interference test device, electric energy meter D.C. magnetic field generating means comprises excitation mechanism and for providing the current device of exciting current to excitation mechanism; Excitation mechanism comprises: the first yoke of strip structure, be wrapped in the first yoke for input exciting current coil, along at least one the L-type yoke for the air gap in the flux circuit that reduces by the first yoke and produce perpendicular to circumference distribution in the plane of the first yoke axial direction.Interference test device comprises: electric energy meter D.C. magnetic field generating means, electric energy meter calibrating apparatus and host computer as above.Electric energy meter D.C. magnetic field generating means of the present utility model and interference test device solve that the excitation mechanism of existing electric energy meter D.C. magnetic field generating means is huge, the technical problem of cost intensive, achieve the simple designs of excitation mechanism in electric energy meter D.C. magnetic field generating means, reduce the cost of electric energy meter D.C. magnetic field generating means.
Description
Technical Field
The utility model relates to an electric energy measurement test field especially relates to an electric energy meter direct current magnetic field generating device and interference test device.
Background
In the use process of the electric energy meter, if external strong magnetic field interference exists, a large metering error can be generated. Due to the working principle of electromagnetic induction of the induction type electric energy meter, when the induction type electric energy meter is interfered by a strong magnetic field, demagnetization can occur in some magnetic devices such as damping magnetic steel, so that permanent damage is caused; the character wheel counter driven by the commonly used stepping motor in the electronic electric energy meter stops rolling and overturning under the influence of strong magnetism, so that the accumulation of electric energy value is stopped, and in addition, the sampling mutual inductor completely fails under the state of magnetic flux saturation to cause a large negative error. Some power consumers are driven by interests, and by utilizing the principle, the electric energy meter is subjected to low charging or non-charging by applying a strong magnetic field on the electric energy meter, so that electricity stealing is carried out, considerable economic loss is caused to the country, and the fairness of metering is also damaged. Aiming at the phenomenon, the international recommendation R46 of the electric energy meter of the metering organization of the international legal system requires that the electric energy meter must be subjected to a 200mT direct-current strong magnetic field interference test during a metering test, and the 'intelligent electric energy meter function specification' recently formulated by the national grid company also contains the test content, namely, a direct-current strong magnetic field within 200mT is applied to the electric energy meter to measure the metering error of the electric energy meter.
Referring to fig. 1, the current domestic metrological department uses a permanent magnet 9 as a dc magnetic field source to provide a magnetic field with a required magnitude for the interference test, because the dc magnetic field with a magnetic field intensity not less than 200mT required by the interference test of the electric energy meter can be generated by using the permanent magnet. The use of permanent magnets as magnetic field sources generally has the following problems: 1. the magnetism of the permanent magnet can be kept all the time, and the magnetic field intensity on the surface of the permanent magnet is over 500mT generally, so that very large attraction is generated, potential safety hazards exist, and the requirements on storage and application of the permanent magnet are high; 2. when the test bench is close to ferromagnetic substances such as a tested instrument, a test tool and parts, if any protective measures are not taken, clamping injury is easily caused by taking and operating of a tester, and scratches are caused to objects in contact with the surface of the permanent magnet, so that damage can be caused in severe cases; 3. when the temperature of the working environment of the permanent magnet changes within a certain range, the magnetism of the magnet is reduced, the change cannot be completely recovered when the temperature returns to a certain temperature, the material structure of the permanent magnet is general and fragile, the impact is difficult to avoid in the using process, the damage caused by the impact is avoided, and the magnetic field intensity of a certain position of the cross section of the permanent magnet can be greatly reduced; 4. the magnetic field intensity generated by the permanent magnet is a certain value, so that the test is not flexible under the test conditions of different magnetic field sizes.
Aiming at the problem of adopting a permanent magnet as an interference magnetic field source, the current-controlled magnetic field generating device can be adopted to solve various problems when the permanent magnet is used as the magnetic field generating device, but the cost is that the power of an excitation power supply or the number of turns of a coil is required to be increased to generate a larger magnetic field required by an electric energy meter interference test, so that an excitation mechanism of the electric energy meter direct-current magnetic field generating device is huge and the cost is high. Therefore, it is urgently needed to design a direct-current magnetic field generating device of an electric energy meter, which has a simple structure and low cost and can meet the magnetic field required by the interference test of the electric energy meter.
SUMMERY OF THE UTILITY MODEL
The utility model provides an electric energy meter direct current magnetic field generating device and interference test device to solve and present to produce through increasing excitation power or the coil number of turns and satisfy the electric energy meter interference test required magnetic field and lead to electric energy meter direct current magnetic field generating device's excitation mechanism huge, technical problem with high costs.
According to an aspect of the utility model, a provide an electric energy meter direct current magnetic field generating device, include:
an excitation mechanism and a current device for supplying excitation current to the excitation mechanism;
the excitation mechanism comprises a first magnetic yoke with a strip structure and a coil wound on the first magnetic yoke and used for inputting excitation current;
the excitation mechanism further comprises at least one L-shaped magnetic yoke which is circumferentially distributed on a plane perpendicular to the axial direction of the first magnetic yoke and used for reducing air gaps in a magnetic flux loop generated by the first magnetic yoke, and the end part of the L-shaped magnetic yoke is connected with the end part of the first magnetic yoke to form a U-shaped structure.
Further, the number of the L-shaped magnetic yokes is four, and the four L-shaped magnetic yokes are uniformly distributed along the circumferential direction on a plane perpendicular to the axial direction of the first magnetic yoke.
Further, the current device is a standard source of direct current.
Furthermore, the electric energy meter direct current magnetic field generating device also comprises a magnetic field calibration device used for calibrating the electric energy meter direct current magnetic field generating device.
Further, the magnetic field calibration device employs a standard teslameter.
Further, the standard tesla meter comprises a hall probe for detecting the magnetic field of the dc magnetic field generating device of the electric energy meter.
Furthermore, the first magnetic yoke and the L-shaped magnetic yoke are both made of pure iron materials.
According to the utility model discloses an on the other hand still provides an electric energy meter direct current magnetic field interference test device, include:
the electric energy meter direct-current magnetic field generating device, the electric energy meter calibrating device and the upper computer are arranged;
the upper computer is used for sending a parameter set value of a detection point to the electric energy meter calibration device and sending an interference magnetic field intensity set value to a current device of the electric energy meter direct-current magnetic field generating device;
the electric energy meter calibrating device is connected with the electric energy meter to be detected, provides calibrating current and calibrating voltage for the electric energy meter to be detected, and obtains the error of the electric energy meter to be detected;
the electric energy meter direct current magnetic field generating device is used for providing an interference magnetic field with a set value of the intensity of the interference magnetic field for the electric energy meter to be detected.
Further, the electric energy meter calibrating device and the current device both comprise RS232 communication interfaces used for communicating with an upper computer.
The utility model discloses following beneficial effect has:
the utility model discloses an electric energy meter direct current magnetic field generating device, through the L type yoke to the magnetic flow return circuit that the excitation mechanism increase reduced first yoke and produced air gap, the magnetic resistance of air gap in the magnetic flow return circuit that has reduced first yoke and produced, can provide bigger magnetic field intensity under the same excitation power or coil number of turns circumstances, thereby need not increase excitation power or coil number of turns and produce and satisfy the required magnetic field of electric energy meter interference test, the excitation mechanism who has solved current electric energy meter direct current magnetic field generating device is huge, technical problem with high costs, the simple design of excitation mechanism in the electric energy meter direct current magnetic field generating device has been realized, the cost of electric energy meter direct current magnetic field generating device has been reduced.
The utility model discloses an electric energy meter direct current magnetic field interference test device sends the parameter setting value of examining the fixed point and sends the interference magnetic field setting value for electric energy meter direct current magnetic field generating device's current device through the host computer for electric energy meter calibrating installation, has solved the technical problem that current electric energy meter direct current magnetic field interference test can not automatic verification, has realized interference test's automatic verification, has improved electric energy meter direct current magnetic field interference test's automation and intellectuality.
In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
FIG. 1 is a schematic structural diagram of a disturbance testing device of an electric energy meter using a permanent magnet as a DC magnetic field source in the prior art;
fig. 2 is a schematic structural diagram of a dc magnetic field generating device of an electric energy meter according to a preferred embodiment of the present invention;
fig. 3 is a block diagram of the dc magnetic field interference testing apparatus of the preferred embodiment of the present invention.
Reference numerals:
1. a first yoke; 2. an L-shaped magnetic yoke; 3. a standard source of direct current; 4. a coil; 5. the electric energy meter to be detected; 6. an electric energy meter calibrating device; 7. an excitation mechanism; 8. an upper computer; 9. and a permanent magnet.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
Referring to fig. 2, a preferred embodiment of the present invention provides an electric energy meter dc magnetic field generating device, including: an excitation mechanism 7 and a current device for supplying an excitation current to the excitation mechanism 7; the excitation mechanism 7 comprises a first magnetic yoke 1 with a strip structure and a coil 4 which is wound on the first magnetic yoke 1 and is used for inputting excitation current; the excitation mechanism 7 further comprises at least one L-shaped magnetic yoke 2 which is distributed along the circumferential direction of the plane perpendicular to the axial direction of the first magnetic yoke 1 and is used for reducing air gaps in a magnetic flux loop generated by the first magnetic yoke 1, and the end part of the L-shaped magnetic yoke 2 is connected with the end part of the first magnetic yoke 1 to form a U-shaped structure.
The utility model discloses an electric energy meter direct current magnetic field generating device, through the L type yoke to the magnetic flow return circuit that the excitation mechanism increase reduced first yoke and produced air gap, the magnetic resistance of air gap in the magnetic flow return circuit that has reduced first yoke and produced, can provide bigger magnetic field intensity under the same excitation power or coil number of turns circumstances, thereby need not increase excitation power or coil number of turns and produce and satisfy the required magnetic field of electric energy meter interference test, the excitation mechanism who has solved current electric energy meter direct current magnetic field generating device is huge, technical problem with high costs, the simple design of excitation mechanism in the electric energy meter direct current magnetic field generating device has been realized, the cost of electric energy meter direct current magnetic field generating device has been reduced.
In order to approximate the distribution of the magnetic field of the permanent magnet and meet the requirement of the magnetic field intensity of test interference, the number of the L-shaped magnetic yokes 2 is four, and the four L-shaped magnetic yokes 2 are uniformly distributed along the circumferential direction on the plane perpendicular to the axial direction of the first magnetic yoke 1. With the excitation mechanism 7 including the L-shaped yoke 2 for reducing the air gap in the magnetic flux circuit generated by the first yoke 1, the principle of providing a larger magnetic field strength with the same excitation power or the number of coil turns is satisfied as follows:
from the relationship between current and magnetic field, the relationship between magnetic flux and current can be obtained as follows:
wherein,representing the magnetic flux, N the number of turns of the coil, I the excitation current, RmRepresenting the flux circuit reluctance.
And the magnetic resistance R in the formula (1)mConsisting of the reluctance of the core and the reluctance of the air gap, expressed as follows:
wherein L ismRepresenting the effective magnetic path length of the core, LaRepresents the air gap, mu represents the core permeability, mu0Represents the vacuum permeability and S represents the cross-sectional area.
When the magnetic induction of the working point of the iron core is low, the magnetic conductivity mu of the iron core>>μ0The reluctance of the air gap is much greater than that of the core, so equation (2) can be approximated by equation (3):
it can thus be obtained that the magnetic field strength H in the air gap is:
because the magnetic line of iron core terminal surface is all around dispersed to can be at iron core cross section center pin apart from a certain position on surface, the measured value when being parallel with the iron core terminal surface with the hall probe response face is as magnetic induction intensity B measured value, and magnetic induction intensity B is for with magnetic field intensity H's relation:
B＝μ0H (5)
based on the above principle, if the exciter needs to be made to have a constant cross-sectional area SThe magnetic field intensity H generated by the structure 7 is larger, and the power of an excitation power supply or the number of turns of a coil can be increased or R in a magnetic flux loop can be reducedm(i.e., L)a) The two modes can effectively increase the magnetic field intensity H, but the cost of increasing the excitation power or the number of turns of the coil to achieve the larger magnetic field intensity is far more than the mode of reducing the magnetic resistance to achieve the larger magnetic field intensity. The present embodiment shortens the air gap L by specially designing the excitation mechanism 7aAnd finally, the requirement of providing larger magnetic field intensity under the condition of the same excitation power supply power or the number of turns of the coil can be met, so that the magnetic field required by the electric energy meter interference test is generated without increasing the excitation power supply power or the number of turns of the coil.
The existing excitation mechanism 7 used in the electric energy meter interference test device generally only adopts the first magnetic yoke 1, and because the magnetic field in the magnetic flux loop formed by the first magnetic yoke 1 and the air gap needs to generate the magnetic field required by the electric energy meter interference test at the cost of increasing the excitation power or the number of turns of the coil, the mode has a complex structure and is expensive. Therefore, the present embodiment adds the L-shaped yoke 2 that reduces the air gap in the magnetic flux loop generated by the first yoke 1 on the basis of the first yoke 1, so as to provide a magnetic field with a strength that meets the requirement of the dc magnetic field disturbance test of the electric energy meter under the condition of the same excitation power or the number of turns of the coil. The first yoke 1 and the L-shaped yoke 2 of the present embodiment may also adopt other combined shape matching, as long as the L-shaped yoke 2 can reduce the air gap in the magnetic flux loop generated by the first yoke 1, so that the magnetic resistance of the air gap in the magnetic flux loop is reduced.
Alternatively, the number of the L-shaped yokes 2 is four, and the four L-shaped yokes 2 are circumferentially and uniformly distributed on a plane perpendicular to the axial direction of the first yoke 1. For better simulation of the magnetic field distribution characteristics of the permanent magnet adopted in the prior art when the permanent magnet is used as a dc magnetic field source, the embodiment adopts four L-shaped magnetic yokes 2 uniformly distributed in the circumferential direction on the plane perpendicular to the axial direction of the first magnetic yoke 1, and the strength and the magnetic field distribution characteristics of the permanent magnet can be completely simulated by setting the four L-shaped magnetic yokes 2 uniformly distributed.
The excitation mechanism 7 of the embodiment can approximately simulate the distribution of the magnetic field of a permanent magnet of 50mm multiplied by 50mm, and can meet the requirement of 200 +/-30 mT of the interference magnetic field strength of an electric energy meter mentioned in the international proposal of the International legal measurement organization R46. In order to simulate the magnetic field distribution of a permanent magnet of 50mm multiplied by 50mm approximately, a boss with a width of 50mm larger than that of the coil is required to be manufactured.
Optionally, the current means is a standard source 3 of direct current. The direct current standard source 3 of this embodiment traces to the source through high accuracy standard resistance, standard voltmeter, and the current precision is high, stability is good to the high stability in magnetic field has been decided. The direct current standard source 3 is adopted to supply exciting current to the exciting mechanism 7, the regulation and control of a magnetic field can be realized, when the magnetic field required by the electric energy meter direct current magnetic field interference test needs to be realized, the direct current standard source 3 can be converted into a current value according to a magnetic field calibration coefficient, current is output to the exciting mechanism 7, and the exciting mechanism 7 generates the magnetic field required by the electric energy meter interference test. On the one hand, adopt this kind of mode of carrying out regulation and control to magnetic field through the electric current can make things convenient for nimble for the interference test provides the different examination magnetic field of multiunit, on the other hand, after the test, only need close direct current standard source 3 and just can make the direct current magnetic field of excitation mechanism 7 disappear, can not produce the influence to people and equipment, factor of safety is high.
Optionally, the electric energy meter direct current magnetic field generating device further comprises a magnetic field calibration device for calibrating the electric energy meter direct current magnetic field generating device. The magnetic field calibration device adopted in the present embodiment is a standard teslameter, and the standard teslameter includes a hall probe for detecting the magnitude of the magnetic field. When a constant current is applied to the excitation mechanism 7, the excitation mechanism 7 protrudes from the end face of the core, and a magnetic field corresponding to the current is generated by the dc standard source 3 in this embodiment. Since the set magnetic field strength needs to be output in the actual test process, the magnetic field needs to be calibrated. In the embodiment, a standard teslameter is used as a magnetic field calibration standard table, a Hall probe is placed at a position 30mm away from the surface of the central axis of the cross section of an iron core, the sensing surface of the probe is ensured to be parallel to the end surface of the iron core, the current output is adjusted to enable the magnetic field intensity at the position to be 200mT, calibration is carried out, and calibration data are stored in direct current standard source equipment. According to the corresponding relation between the current after calibration and the magnetic field intensity, the size of the magnetic field can be adjusted and output through the equipment control key, and the magnetic field intensity at the position can be adjusted within 0-230 mT.
Optionally, the first magnetic yoke 1 and the L-shaped magnetic yoke 2 are both made of pure iron material. In this embodiment, the iron core is made of pure iron material, so that the problem of magnetic field intensity reduction caused by impact can be avoided, and the magnetic field intensity generated by the excitation mechanism 7 in this embodiment is not affected by the ambient temperature.
Referring to fig. 3, according to the utility model discloses a further aspect provides an electric energy meter direct current magnetic field interference test device, includes: the electric energy meter direct current magnetic field generating device, the electric energy meter calibrating device 6 and the upper computer 8 are arranged; the upper computer 8 is used for sending a parameter set value of a detection point to the electric energy meter calibration device 6 and sending an interference magnetic field intensity set value to a current device of the electric energy meter direct-current magnetic field generation device; the electric energy meter calibrating device 6 is used for being connected with the electric energy meter 5 to be tested, providing calibrating current and calibrating voltage for the electric energy meter 5 to be tested and acquiring the error of the electric energy meter 5 to be tested; the electric energy meter direct current magnetic field generating device is used for providing an interference magnetic field with a set value of the interference magnetic field strength for the detected electric energy meter 5. The verification parameters comprise current, voltage, power factors, frequency and the like, and the set value of the interference magnetic field strength is an interference magnetic field value required for performing an electric energy meter magnetic field interference test.
The electric energy meter direct current magnetic field interference test device of this embodiment sends the parameter setting value of examining the fixed point for electric energy meter calibrating installation and sends the interference magnetic field setting value for the electric energy meter direct current magnetic field generating device's current device through the host computer, has solved the technical problem that current electric energy meter direct current magnetic field interference test can not automatic verification, has realized the automatic verification of interference test, has improved electric energy meter direct current magnetic field interference test's automation and intellectuality. Specifically, the upper computer 8 sends a set value of the interfering magnetic field strength to the current device, the current device provides an excitation current corresponding to the set value of the interfering magnetic field strength to an excitation mechanism of the direct-current magnetic field generating device of the electric energy meter, the excitation mechanism generates an interfering magnetic field with the set value of the interfering magnetic field strength as an interfering magnetic field of the electric energy meter 5 to be detected, the interfering magnetic field can be arbitrarily regulated and controlled within a certain range along with the setting of the upper computer, meanwhile, the electric energy meter calibrating device 6 provides calibrating current and calibrating voltage for the electric energy meter 5 to be detected, and the error of the electric energy meter 5 to be detected under the condition of the set value of.
Optionally, the electric energy meter calibration device 6 and the current device each include an RS232 communication interface for communicating with the upper computer 8. Optionally, the embodiment may also perform communication in other communication manners, such as RS485 or wireless communication.
When an interference test of a single-phase electric energy meter with a verification requirement of AC220V/10A, a power factor of 1.0 and a direct-current magnetic field of 150mT needs to be carried out, firstly, a verification project is generated through software of an upper computer 8 according to the verification requirement, after verification is started, the upper computer 8 sends a parameter set value of a detection point to an electric energy meter verification device 6 through RS232 communication, the electric energy meter verification device 6 outputs corresponding verification voltage and verification current to the electric energy meter and reads electric energy pulses of the electric energy meter, meanwhile, the upper computer 8 sends a magnetic field strength value to a direct-current standard source 3 through RS232 communication, the direct-current standard source 3 is converted into a current value according to a magnetic field calibration coefficient and outputs current to an excitation mechanism 7, and the excitation mechanism 7 generates a magnetic field and affects metering of the electric energy meter. The upper computer 8 reads the corresponding error value through the electric energy meter calibrating device 6, and after the calibrating process is completed, the upper computer 8 sends calibrating voltage, calibrating current and magnetic field intensity return-to-zero signals to corresponding equipment. And after the verification is finished, automatically generating a verification result report. The full-automatic verification of the electric energy meter interference test can be realized by adopting the upper computer 8 to send verification parameter values to the electric energy meter verification device 6 and sending interference magnetic field intensity set values to the current device, so that the automation and intelligence degree of the electric energy meter direct current magnetic field interference test device are improved. In addition, the upper computer 8 of the embodiment can also read, store and manage the data of the electric energy meter calibrating device 6 and the direct current standard source 3, and print the data into a report, so that the calibrating efficiency is greatly improved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A direct current magnetic field generating device of an electric energy meter is characterized by comprising:
an excitation mechanism (7) and a current device for supplying an excitation current to the excitation mechanism (7);
the excitation mechanism (7) comprises a first magnetic yoke (1) with a strip structure and a coil (4) which is wound on the first magnetic yoke (1) and is used for inputting the excitation current; it is characterized in that the preparation method is characterized in that,
the excitation mechanism (7) further comprises at least one L-shaped magnetic yoke (2) which is distributed along the circumferential direction on a plane perpendicular to the axial direction of the first magnetic yoke (1) and used for reducing air gaps in a magnetic flux loop generated by the first magnetic yoke (1), and the end part of the L-shaped magnetic yoke (2) is connected with the end part of the first magnetic yoke (1) to form a U-shaped structure.
2. The direct-current magnetic field generating device of the electric energy meter according to claim 1,
the number of the L-shaped magnetic yokes (2) is four, and the four L-shaped magnetic yokes (2) are uniformly distributed in the circumferential direction on the plane perpendicular to the axial direction of the first magnetic yoke (1).
3. The direct-current magnetic field generating device of the electric energy meter according to claim 2,
the current device is a direct current standard source (3).
4. The direct-current magnetic field generating device of the electric energy meter according to claim 3,
the electric energy meter direct current magnetic field generating device further comprises a magnetic field calibration device used for calibrating the electric energy meter direct current magnetic field generating device.
5. The direct-current magnetic field generating device of the electric energy meter according to claim 4,
the magnetic field calibration device employs a standard teslameter.
6. The DC magnetic field generator of electric energy meter according to claim 5,
the standard Tesla meter comprises a Hall probe used for detecting the magnetic field of the direct-current magnetic field generating device of the electric energy meter.
7. The direct-current magnetic field generating device of the electric energy meter according to claim 6,
the first magnetic yoke (1) and the L-shaped magnetic yoke (2) are both made of pure iron materials.
8. The utility model provides an electric energy meter direct current magnetic field interference test device which characterized in that includes:
the electric energy meter direct current magnetic field generating device, the electric energy meter calibrating device (6) and the upper computer (8) according to any one of claims 1 to 7;
the upper computer (8) is used for sending a parameter set value of a detection point to the electric energy meter calibration device (6) and sending an interference magnetic field intensity set value to a current device of the electric energy meter direct-current magnetic field generating device;
the electric energy meter calibrating device (6) is used for being connected with the electric energy meter (5) to be detected, providing calibrating current and calibrating voltage for the electric energy meter (5) to be detected, and acquiring the error of the electric energy meter (5) to be detected;
the electric energy meter direct current magnetic field generating device is used for providing an interference magnetic field with the set value of the interference magnetic field strength for the detected electric energy meter (5).
9. The DC magnetic field disturbance testing device of the electric energy meter according to claim 8,
the electric energy meter calibrating device (6) and the current device both comprise RS232 communication interfaces used for communicating with the upper computer (8).
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| CN201520110892.0U CN204614578U (en) | 2015-02-15 | 2015-02-15 | Electric energy meter D.C. magnetic field generating means and interference test device |
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| CN201520110892.0U CN204614578U (en) | 2015-02-15 | 2015-02-15 | Electric energy meter D.C. magnetic field generating means and interference test device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104700977A (en) * | 2015-02-15 | 2015-06-10 | 长沙天恒测控技术有限公司 | Electric energy meter DC magnetic field generator and interference test device |
| CN108120952A (en) * | 2018-02-14 | 2018-06-05 | 国网江西省电力有限公司电力科学研究院 | A kind of electric energy meter stationary magnetic field influences experimental rig |
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2015
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104700977A (en) * | 2015-02-15 | 2015-06-10 | 长沙天恒测控技术有限公司 | Electric energy meter DC magnetic field generator and interference test device |
| CN104700977B (en) * | 2015-02-15 | 2017-01-11 | 长沙天恒测控技术有限公司 | Electric energy meter DC magnetic field generator and interference test device |
| CN108120952A (en) * | 2018-02-14 | 2018-06-05 | 国网江西省电力有限公司电力科学研究院 | A kind of electric energy meter stationary magnetic field influences experimental rig |
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