CN114384459A - Method, system and device for detecting reliability of hard connection - Google Patents
Method, system and device for detecting reliability of hard connection Download PDFInfo
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- CN114384459A CN114384459A CN202111497715.9A CN202111497715A CN114384459A CN 114384459 A CN114384459 A CN 114384459A CN 202111497715 A CN202111497715 A CN 202111497715A CN 114384459 A CN114384459 A CN 114384459A
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Abstract
The invention discloses a method, a system and a device for detecting the hard connection reliability.
Description
Technical Field
The invention relates to a method, a system and a device for detecting the reliability of hard connection, belonging to the field of electric energy meter detection.
Background
The electric energy meter is used as a meter for measuring the electricity consumption of an electric power consumer, is a bridge for connecting a power grid and the electric power consumer, and has huge quantity and wide application range. The electronic electric energy meter used at present has accurate and reliable functions of electric energy metering, data processing, communication and the like, and simultaneously has power consumption as an electronic product, although the consumption does not count electric power users, the consumption belongs to the loss of power supply enterprises, along with the gradual increase of power consumption requirements, the load is larger and larger, and in order to improve the effective utilization rate of electric energy to the maximum extent, the power consumption of the electric energy meter is required to be reduced.
In the past, a screw fastening mode is mostly adopted between a copper bar of a wiring terminal of an electronic electric energy meter and a sampling element (a relay, a mutual inductor and the like), the installation mode is low in batch automatic manufacturing level, most importantly, the contact resistance of a current loop is large, and quality risks such as poor contact and the like caused by the quality of screws and the like exist. Since 2020, in order to reduce the power consumption of the electric energy meter to the maximum, the electric energy meter industry gradually introduces a new hard connection processing technology, and the current mature hard connection mode comprises two technologies of welding and riveting, and the hard connection processing technology can greatly reduce the contact resistance of a current loop and is more suitable for an automatic manufacturing process.
Although the new hard-wired process effectively reduces the resistance of the current loop, there are also hidden risks of quality of the process, such as: the riveting mode may cause insufficient or even insecure effective contact area after riveting due to the mismatching of the tolerance of the riveting piece; the welding method may have the defects of poor contact and even insecurity of the final inner welding surface due to the abnormal conditions of the change of the material of the welding material, the change of the thickness of the welding material, the area of the welding material, the welding strength and the like. The hard connection process may have defects, which may ultimately affect the impedance of a current loop of the electric energy meter, affect the accuracy of electric energy metering and sampling, and even cause abnormal heating or even fire due to serious poor contact.
In order to reduce the bad hidden trouble of hard connection, the production of the electric energy meter is mainly processed by two means at present: 1) visual or optical contrast inspection is added in the hard connection process of the wiring terminal and the sampling part; 2) and after the electric energy meter is assembled, testing influence quantity of different loads when the electric energy metering accuracy of the whole electric energy meter is improved. Wherein, the visual or optical comparison of the hard connection process link can only be judged by external phenomena, and the effectiveness of the internal contact surface cannot be seen through; although the influence quantity test carried out by adding different loads in the link of the whole machine is effective, the time cost is higher, and the productivity is seriously influenced. Thus, both of these methods are not effective and inefficient, although problems may be found to some extent.
Disclosure of Invention
The invention provides a method, a system and a device for detecting the reliability of hard connection, which solve the problems disclosed in the background technology.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a method for detecting the reliability of hard connection comprises the following steps:
responding to the normal state of a measured loop of the electric energy meter, and sending a constant current loading instruction to control a power supply assembly to load constant current to the measured loop of the electric energy meter;
sampling the voltage of a measured loop of the electric energy meter, and calculating the resistance average value of the measured loop of the electric energy meter;
if the mean value of the resistance is within the preset range, the hard connection of the loop to be tested of the electric energy meter is reliable.
The method also comprises the step of detecting whether the loop of the electric energy meter is normal or not, and the step comprises the following steps:
responding to a received signal for detecting and starting the reliability of the measured loop of the electric energy meter, sending a power transmission line connection instruction, controlling a power supply assembly to be communicated with the measured loop of the electric energy meter, sending a sampling line connection instruction, and controlling a voltage measuring device to be communicated with the measured loop of the electric energy meter;
sending a detection current loading signal to a power supply assembly to control the power supply assembly to load detection current to a detected loop of the electric energy meter;
and receiving the voltage of the measured loop of the electric energy meter measured by the voltage measuring equipment, and if the voltage of the measured loop of the electric energy meter is not more than the threshold value, judging that the measured loop of the electric energy meter is normal.
Sampling the voltage of the loop to be measured of the electric energy meter, calculating the resistance mean value of the loop to be measured of the electric energy meter, including:
sampling the voltage of a measured loop of the electric energy meter at equal intervals;
calculating the resistance of a measuring loop of the electric energy meter according to the constant current and the voltage sampled each time;
and carrying out mean value calculation on the resistance of the measured loop of the electric energy meter to obtain the mean value of the resistance of the measured loop of the electric energy meter.
And before the electric energy meter measures the loop resistance, the voltage sampled for the first time is removed.
A hard-wired reliability detection system, comprising:
constant current loading module: responding to the normal state of a measured loop of the electric energy meter, and sending a constant current loading instruction to control a power supply assembly to load constant current to the measured loop of the electric energy meter;
the resistance mean value calculation module: sampling the voltage of a measured loop of the electric energy meter, and calculating the resistance average value of the measured loop of the electric energy meter;
a judging module: if the mean value of the resistance is within the preset range, the hard connection of the loop to be tested of the electric energy meter is reliable.
Still include detection module for whether the detection electric energy meter measuring loop is normal, detection module includes:
a line connection module: responding to a received signal for detecting and starting the reliability of the measured loop of the electric energy meter, sending a power transmission line connection instruction, controlling a power supply assembly to be communicated with the measured loop of the electric energy meter, sending a sampling line connection instruction, and controlling a voltage measuring device to be communicated with the measured loop of the electric energy meter;
a detection current loading module: sending a detection current loading signal to a power supply assembly to control the power supply assembly to load detection current to a detected loop of the electric energy meter;
a detection result module: and receiving the voltage of the measured loop of the electric energy meter measured by the voltage measuring equipment, and if the voltage of the measured loop of the electric energy meter is not more than the threshold value, judging that the measured loop of the electric energy meter is normal.
The resistance average value calculation module comprises:
a sampling module: sampling the voltage of a measured loop of the electric energy meter at equal intervals;
a resistance calculation module: calculating the resistance of a measuring loop of the electric energy meter according to the constant current and the voltage sampled each time;
the mean value calculation module: and carrying out mean value calculation on the resistance of the measured loop of the electric energy meter to obtain the mean value of the resistance of the measured loop of the electric energy meter.
The resistance mean value calculation module further comprises a rejection module, and the voltage sampled for the first time is rejected before the resistance of the loop to be measured of the electric energy meter.
A hard connection reliability detection device comprises a controller, a power supply assembly, a voltage measurement device, a power transmission line on-off control device and a sampling line on-off control device;
the controller is connected with the power supply assembly, the voltage measuring device, the power transmission line on-off control device and the sampling line on-off control device, the voltage measuring device is connected with the loop to be measured of the electric energy meter through the sampling line on-off control device, and the power supply assembly is connected with the loop to be measured of the electric energy meter through the power transmission line on-off control device;
a controller: detecting the reliability of the hard connection of a detected loop of the electric energy meter by adopting a hard connection reliability detection method;
on-off control equipment for power transmission line: receiving an instruction of a controller, and controlling the connection or disconnection of a power supply assembly and a measuring loop of the electric energy meter;
sampling circuit on-off control equipment: receiving an instruction of a controller, and controlling the voltage measuring equipment to be connected or disconnected with a measuring loop of the electric energy meter;
the power supply assembly: supplying power to the device; and receiving the instruction of the controller, and loading the current to the measured loop of the electric energy meter.
The invention achieves the following beneficial effects: the method loads constant current to the tested loop, samples the ohm law, calculates the resistance mean value of the tested loop, and judges the hard connection reliability of the tested loop by combining the normal range of the resistance, and the detection mode is simple and efficient.
Drawings
FIG. 1 is a schematic diagram of a loop resistance measurement;
FIG. 2 is a flow chart of a hard-wired reliability detection method;
FIG. 3 is a block diagram of the apparatus;
FIG. 4 is a block diagram of power supply component assembly;
fig. 5 shows the results of comparative tests of the welding effect.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the actual operation process of the electronic electric energy meter, the load current flows through each loop, then the load current is converted through sampling, and then the load power consumption is measured, from the perspective of reliability and safety and from the perspective of sampling accuracy of the electric energy meter, the most effective inspection method is to simulate the field, namely, a certain current (generally in the range of 0-120A) is directly applied to the loop, and the hard connection performance of the loop is inspected and identified according to the influence difference expressed after the current is applied.
The simplest and most effective method is to measure the voltage value of a fixed point after applying current, calculate the equivalent resistance of the loop by using ohm's law, and test the quality and consistency of the hard connection processing technology according to the resistance value, wherein the smaller the resistance value, the better the performance.
As shown in fig. 1, each loop is composed of 2 terminal copper bars and a relay/transformer, and the copper bars and the relay/transformer are connected through riveting or welding. The current I (A) is applied to the loop, then test points at two outer ends of a loop connection point are fixedly selected, the corresponding voltage value V (mV) is measured, and the loop resistance R (m omega) can be calculated by using the ohm law R = V/I, wherein the smaller the resistance value is, the better the performance of hard connection processing is.
Based on the above principle, a method for detecting the reliability of hard connection as shown in fig. 2 can be constructed, which includes the following steps:
step 1, responding to the normal state of a measured loop of an electric energy meter, sending a constant current loading instruction to control a power supply assembly to load constant current to the measured loop of the electric energy meter;
step 2, sampling the voltage of the loop to be measured of the electric energy meter, and calculating the resistance mean value of the loop to be measured of the electric energy meter;
and 3, if the mean value of the resistors is within a preset range, the hard connection of the measured loop of the electric energy meter is reliable.
The method comprises the steps of loading constant current to the tested loop, sampling ohm's law, calculating the resistance mean value of the tested loop, and judging the hard connection reliability of the tested loop by combining the normal range of the resistance, wherein the detection mode is simple and efficient.
The loop of the electric energy meter is generally in two states, wherein the two states are a normal state and an open circuit/abnormal state, and if the loop is in the open circuit state, the unreliable hard connection can be directly known, namely the loop is a defective product. Therefore, before detection, detection of the loop to be detected is performed, and the specific process can be as follows:
11) responding to a received signal for detecting and starting the reliability of the measured loop of the electric energy meter, sending a power transmission line connection instruction, controlling a power supply assembly to be communicated with the measured loop of the electric energy meter, sending a sampling line connection instruction, and controlling a voltage measuring device to be communicated with the measured loop of the electric energy meter;
when the detected loop reaches a fixed position, a detection starting signal is received, the control power supply assembly is required to be controlled to be communicated with the detected loop of the electric energy meter, and the control voltage measuring equipment is communicated with the detected loop of the electric energy meter;
12) sending a detection current loading signal to a power supply assembly to control the power supply assembly to load detection current to a detected loop of the electric energy meter, wherein the current is small and is generally less than 1A;
13) receiving the voltage of a measured loop of the electric energy meter measured by the voltage measuring equipment, if the voltage of the measured loop of the electric energy meter is not more than a threshold value, judging that the measured loop of the electric energy meter is normal, and performing further detection, namely reliability detection, or judging that the measured loop of the electric energy meter is open/abnormal;
when the open circuit/abnormity of the tested loop is detected, the control power supply assembly is disconnected with the tested loop of the electric energy meter, the control voltage measuring equipment is disconnected with the tested loop of the electric energy meter, and the tested loop is recorded as a defective product.
When the detected loop is detected normally, the control power supply assembly loads constant current to the detected loop of the electric energy meter, and the larger current is generally the maximum current of the electric energy meter or 1.2 times of the maximum current.
Voltage measurement equipment can detect the voltage in the return circuit, carries out the equidistant sampling to the voltage that detects, and sampling interval time is no longer than 1 second, in order to avoid interfering with data, rejects the voltage of first sampling, records and saves subsequent voltage, adopts the voltage value and the constant current of sampling, calculates electric energy meter measuring loop resistance, carries out mean value calculation to electric energy meter measuring loop resistance, obtains electric energy meter measuring loop's resistance mean value.
And comparing the resistance average value with a preset range, if the resistance average value is within the preset range, the hard connection of the measured loop of the electric energy meter is reliable, otherwise, the hard connection is unreliable, the control power supply assembly is disconnected with the measured loop of the electric energy meter, the control voltage measuring equipment is disconnected with the measured loop of the electric energy meter, and the measured loop is recorded as a defective product.
Based on the same technical scheme, the invention also discloses a software system corresponding to the method, namely a hard connection reliability detection system, which comprises the following steps:
constant current loading module: responding to the normal state of a measured loop of the electric energy meter, and sending a constant current loading instruction to control a power supply assembly to load constant current to the measured loop of the electric energy meter;
the resistance mean value calculation module: sampling the voltage of a measured loop of the electric energy meter, and calculating the resistance average value of the measured loop of the electric energy meter;
the resistance average value calculation module comprises:
a sampling module: sampling the voltage of a measured loop of the electric energy meter at equal intervals;
a resistance calculation module: calculating the resistance of a measuring loop of the electric energy meter according to the constant current and the voltage sampled each time;
the mean value calculation module: and carrying out mean value calculation on the resistance of the measured loop of the electric energy meter to obtain the mean value of the resistance of the measured loop of the electric energy meter.
A judging module: if the mean value of the resistance is within the preset range, the hard connection of the loop to be tested of the electric energy meter is reliable.
The detection module for whether the detection electric energy meter measuring loop is normal, the detection module includes:
a line connection module: responding to a received signal for detecting and starting the reliability of the measured loop of the electric energy meter, sending a power transmission line connection instruction, controlling a power supply assembly to be communicated with the measured loop of the electric energy meter, sending a sampling line connection instruction, and controlling a voltage measuring device to be communicated with the measured loop of the electric energy meter;
a detection current loading module: sending a detection current loading signal to a power supply assembly to control the power supply assembly to load detection current to a detected loop of the electric energy meter;
a detection result module: and receiving the voltage of the measured loop of the electric energy meter measured by the voltage measuring equipment, and if the voltage of the measured loop of the electric energy meter is not more than the threshold value, judging that the measured loop of the electric energy meter is normal.
And the rejection module rejects the voltage sampled for the first time before the resistance of the measured loop of the electric energy meter.
Based on the same technical scheme, the invention also discloses a device for detecting the reliability of hard connection, which comprises a controller, a power supply assembly and a control and measurement component as shown in figure 3, wherein the control and measurement component comprises a voltage measurement device, a power transmission line on-off control device and a sampling line on-off control device.
The controller is connected with the power supply assembly, the voltage measuring device, the power transmission line on-off control device and the sampling line on-off control device, the voltage measuring device is connected with the electric energy meter measuring loop through the sampling line on-off control device, and the power supply assembly is connected with the electric energy meter measuring loop through the power transmission line on-off control device.
The power supply assembly: supplying power to the device; and receiving the instruction of the controller, and loading the current to the measured loop of the electric energy meter.
As shown in fig. 4, the power supply module mainly provides the working power supply of the whole device and the analog current source to be applied to the tested loop, and the power supply module performs two-way conversion of the input power supply outside the device, one way of alternating current is converted into low-voltage direct current power supply as the working power supply required by the whole device, and the other way of the power supply module performs high-current constant-current source conversion, and can output multiple ways of constant currents to the tested loop according to the control requirement in the controller instruction.
The control and measurement component is an actuating mechanism and a data collection unit, wherein the voltage measurement equipment is used for measuring the voltage of the measured loop; the power transmission line on-off control equipment receives the instruction of the controller and controls the connection or disconnection of the power supply assembly and the measured loop of the electric energy meter; and the sampling circuit on-off control equipment receives the instruction of the controller and controls the voltage measuring equipment to be connected or disconnected with the measuring loop of the electric energy meter.
The sampling line on-off control equipment is a line body automatic connection structure, is switching equipment between the voltage measurement equipment and the tested loop, and is automatically connected with the tested loop according to the instruction of the controller. The power transmission line on-off control equipment comprises a current output mechanical control component and a combined execution component, wherein the current output mechanical control component mainly reliably contacts a tested loop, and the combined execution component controls the current output mechanical control component according to a controller instruction.
The controller detects the reliability of the hard connection of the detected loop of the electric energy meter by adopting a hard connection reliability detection method, is the brain of the whole device, and is the core of data processing, instruction issuing and signal input. In order to facilitate the checking of the detection result, the controller is also connected with the display unit, so that the man-machine interaction is facilitated.
In order to verify the method and the device, a group of comparison tests are carried out aiming at the welding mode, the copper strips of the connecting terminals of the electric energy meters in the same batch, the transformers in the same batch are selected, the same welding material is used, the different areas of the welding material are only adjusted, the welding material areas are divided into A, B, C, D four groups, the area size A is more than B and less than C and less than D, the samples with the four groups of different welding material areas are welded by adopting the same welding method, 72A current is applied to a loop of a finished product, the average value of loop resistances corresponding to the four groups of samples is calculated by measuring the voltage values at the same position at different time, and the specific test result is drawn as the graph shown in FIG. 5.
As can be seen from the above figure:
1) the loop resistance mean values are obviously different in different solder areas;
2) with the lapse of the applied current time, the average value of the loop resistance has a tendency of slowly increasing, but the increasing amplitude gradually becomes slow and stable;
3) the current is applied for different time, the trend of the average value difference of the loop resistance corresponding to different areas is always kept, and the relative comparison effect of the test result of the beginning of applying the current and the test result after the current tends to be stable is consistent, namely: the method does not need to last for a long time, can quickly test corresponding data after current is applied, analyzes and judges the performance after welding, does not need to wait for a long time, and has high efficiency.
Based on the same technical solution, the present invention also discloses a computer-readable storage medium storing one or more programs, the one or more programs including instructions, which when executed by a computing device, cause the computing device to execute a hard connection reliability detection method.
Based on the same technical solution, the present invention also discloses a computing device, comprising one or more processors, one or more memories, and one or more programs, wherein the one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, and the one or more programs include instructions for executing the hard connection reliability detection method.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.
Claims (9)
1. A method for detecting reliability of hard connection, comprising:
responding to the normal state of a measured loop of the electric energy meter, and sending a constant current loading instruction to control a power supply assembly to load constant current to the measured loop of the electric energy meter;
sampling the voltage of a measured loop of the electric energy meter, and calculating the resistance average value of the measured loop of the electric energy meter;
if the mean value of the resistance is within the preset range, the hard connection of the loop to be tested of the electric energy meter is reliable.
2. The method of claim 1, further comprising the step of detecting whether the loop of the power meter is normal, the step comprising:
responding to a received signal for detecting and starting the reliability of the measured loop of the electric energy meter, sending a power transmission line connection instruction, controlling a power supply assembly to be communicated with the measured loop of the electric energy meter, sending a sampling line connection instruction, and controlling a voltage measuring device to be communicated with the measured loop of the electric energy meter;
sending a detection current loading signal to a power supply assembly to control the power supply assembly to load detection current to a detected loop of the electric energy meter;
and receiving the voltage of the measured loop of the electric energy meter measured by the voltage measuring equipment, and if the voltage of the measured loop of the electric energy meter is not more than the threshold value, judging that the measured loop of the electric energy meter is normal.
3. The method of claim 1, wherein sampling the voltage of the loop of the power meter to calculate the mean resistance of the loop of the power meter comprises:
sampling the voltage of a measured loop of the electric energy meter at equal intervals;
calculating the resistance of a measuring loop of the electric energy meter according to the constant current and the voltage sampled each time;
and carrying out mean value calculation on the resistance of the measured loop of the electric energy meter to obtain the mean value of the resistance of the measured loop of the electric energy meter.
4. The method of claim 3, wherein the first sampled voltage is rejected before the power meter measures the loop resistance.
5. A hard-wired reliability detection system, comprising:
constant current loading module: responding to the normal state of a measured loop of the electric energy meter, and sending a constant current loading instruction to control a power supply assembly to load constant current to the measured loop of the electric energy meter;
the resistance mean value calculation module: sampling the voltage of a measured loop of the electric energy meter, and calculating the resistance average value of the measured loop of the electric energy meter;
a judging module: if the mean value of the resistance is within the preset range, the hard connection of the loop to be tested of the electric energy meter is reliable.
6. The system of claim 5, further comprising a detection module for detecting whether the loop of the power meter is normal, wherein the detection module comprises:
a line connection module: responding to a received signal for detecting and starting the reliability of the measured loop of the electric energy meter, sending a power transmission line connection instruction, controlling a power supply assembly to be communicated with the measured loop of the electric energy meter, sending a sampling line connection instruction, and controlling a voltage measuring device to be communicated with the measured loop of the electric energy meter;
a detection current loading module: sending a detection current loading signal to a power supply assembly to control the power supply assembly to load detection current to a detected loop of the electric energy meter;
a detection result module: and receiving the voltage of the measured loop of the electric energy meter measured by the voltage measuring equipment, and if the voltage of the measured loop of the electric energy meter is not more than the threshold value, judging that the measured loop of the electric energy meter is normal.
7. The system of claim 5, wherein the resistance mean calculation module comprises:
a sampling module: sampling the voltage of a measured loop of the electric energy meter at equal intervals;
a resistance calculation module: calculating the resistance of a measuring loop of the electric energy meter according to the constant current and the voltage sampled each time;
the mean value calculation module: and carrying out mean value calculation on the resistance of the measured loop of the electric energy meter to obtain the mean value of the resistance of the measured loop of the electric energy meter.
8. The system of claim 7, wherein the mean resistance calculation module further comprises a rejection module that rejects the first sampled voltage before the power meter measures the loop resistance.
9. A hard connection reliability detection device is characterized by comprising a controller, a power supply assembly, a voltage measuring device, a power transmission line on-off control device and a sampling line on-off control device;
the controller is connected with the power supply assembly, the voltage measuring device, the power transmission line on-off control device and the sampling line on-off control device, the voltage measuring device is connected with the loop to be measured of the electric energy meter through the sampling line on-off control device, and the power supply assembly is connected with the loop to be measured of the electric energy meter through the power transmission line on-off control device;
a controller: detecting the reliability of the hard connection of the tested loop of the electric energy meter by adopting the method of any one of claims 1 to 4;
on-off control equipment for power transmission line: receiving an instruction of a controller, and controlling the connection or disconnection of a power supply assembly and a measuring loop of the electric energy meter;
sampling circuit on-off control equipment: receiving an instruction of a controller, and controlling the voltage measuring equipment to be connected or disconnected with a measuring loop of the electric energy meter;
the power supply assembly: supplying power to the device; and receiving the instruction of the controller, and loading the current to the measured loop of the electric energy meter.
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| CN204719137U (en) * | 2015-06-05 | 2015-10-21 | 广东电网有限责任公司珠海供电局 | Binding clip and loop resistance proving installation |
| CN105182157A (en) * | 2015-09-07 | 2015-12-23 | 江苏省电力公司泰州供电公司 | Neutral point multi-point grounding detection device based on high-accuracy detection current |
| CN105301362A (en) * | 2015-11-02 | 2016-02-03 | 清华大学 | Portable large-current dynamic loop resistance detection device |
| CN205583646U (en) * | 2016-05-06 | 2016-09-14 | 广州市博达电子科技有限公司 | Earth leakage protection wall switch |
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