阅读说明：本技术 一种带互感器的三相三线计量装置接线检测方法 (Wiring detection method for three-phase three-wire metering device with mutual inductor ) 是由 张志闻 余梅梅 侯玉 刘旸 黄令忠 李涛 戴斌 刘启彬 于 2019-09-16 设计创作，主要内容包括：本发明公开了一种带互感器的三相三线计量装置接线检测方法,其包括步骤：步骤S1,利用带阻抗测量回路的电桥装置测量目标计量装置,检测其电流回路的阻抗值,根据检测的结果判断电流回路接线情况；步骤S2,利用带阻抗测量回路的电桥装置测量目标计量装置,检测其电压回路的阻抗值,根据检测的结果判断电压回路接线情况。实施本发明,仅通过电桥装置在不带电不拆接线的情况下,通过对计量回路中电流回路和电压回路进行校验阻抗值的方法实现对计量装置的有效检测,降低接线错误或极性反接风险,准确锁定接线错误点,提高工作效率,减少不必要的供用电纠纷。(The invention discloses a wiring detection method of a three-phase three-wire metering device with a mutual inductor, which comprises the following steps: step S1, measuring the target metering device by using the bridge device with the impedance measuring loop, detecting the impedance value of the current loop, and judging the wiring condition of the current loop according to the detection result; and step S2, measuring the target metering device by using the bridge device with the impedance measuring loop, detecting the impedance value of the voltage loop, and judging the wiring condition of the voltage loop according to the detection result. By implementing the method, the effective detection of the metering device is realized by checking the impedance values of the current loop and the voltage loop in the metering loop only through the bridge device without electricity and wire disconnection, the risk of wire connection error or polarity reversal is reduced, the wire connection error point is accurately locked, the working efficiency is improved, and unnecessary power supply and utilization disputes are reduced.)

1. A wiring detection method of a three-phase three-wire metering device with a mutual inductor is characterized by comprising the following steps:

step S1, measuring the target metering device by using the bridge device with the impedance measuring loop, detecting the impedance value of the current loop, and judging the wiring condition of the current loop according to the detection result;

and step S2, measuring the target metering device by using the bridge device with the impedance measuring loop, detecting the impedance value of the voltage loop, and judging the wiring condition of the voltage loop according to the detection result.

2. The method of claim 1, wherein the step S1 of detecting the impedance value of the current loop includes determining the wiring condition of the current loop according to the detected result,

measuring an A-phase current loop, disconnecting a junction box connecting sheet LA1 of a metering device, connecting a terminal KA1 and a terminal A4 respectively by using a measuring clamp of a bridge device, starting the bridge device, detecting the result of the impedance value of the bridge device, if the result of the reactance value is not zero, correctly wiring the CT to the junction box, if the result of the resistance value is zero, the polarities of two ends of the wiring are opposite, and if the result of the resistance value is infinite, a disconnection point exists in the current loop;

closing a junction box connecting piece LA1 of the metering device, starting the bridge device again, detecting the result of the impedance value of the A-phase current loop, and if the result of the resistance value is zero, the loop of the whole metering device is correctly wired; if the result of the reactance value is not zero, a disconnection point exists in the wiring loop from the junction box to the electric meter.

3. The method of claim 1, wherein the step S1 of detecting the impedance value of the current loop includes determining the wiring condition of the current loop according to the detected result,

measuring a C-phase current loop, disconnecting a junction box connecting sheet LC1 of the metering device, connecting a terminal KC1 and a terminal C4 respectively by using a measuring clamp of a bridge device, starting the bridge device, detecting the result of the impedance value of the bridge device, if the result of the reactance value is not zero, correctly wiring the CT to the junction box, if the result of the resistance value is zero, the polarities of two ends of the wiring are opposite, and if the result of the resistance value is infinite, a disconnection point exists in the current loop;

closing the junction box connecting piece LC1 of the metering device, starting the bridge device again, detecting the impedance value result of the C-phase current loop, and if the resistance value result is zero, the loop wiring of the whole metering device is correct; if the result of the reactance value is not zero, a disconnection point exists in the wiring loop from the junction box to the electric meter.

4. The method of claim 1, wherein the step S2 of detecting the impedance value of the voltage loop includes determining the connection condition of the voltage loop according to the detected result,

the A-phase voltage loop is measured, measuring clamps of the bridge device are respectively connected with the terminal PA1 and the terminal PA2, the bridge device is started, the impedance value of the bridge device is detected, if the impedance value is zero, the wiring is correct, and if the impedance value is not zero, a breakpoint exists in the A-phase voltage loop.

5. The method of claim 1, wherein the step S2 of detecting the impedance value of the voltage loop includes determining the connection condition of the voltage loop according to the detected result,

and measuring a B-phase voltage loop, connecting measuring clamps of the bridge device to a terminal PB1 and a terminal PB2 respectively, starting the bridge device, detecting the result of the impedance value of the bridge device, and if the result of the impedance value is zero, correctly wiring, and if the result of the impedance value is not zero, a breakpoint exists in the B-phase voltage loop.

6. The method of claim 1, wherein the step S2 of detecting the impedance value of the voltage loop includes determining the connection condition of the voltage loop according to the detected result,

the C-phase voltage loop is measured, the measuring clamp of the bridge device is respectively connected with the terminal PC1 and the terminal PC2, the bridge device is started, the impedance value of the bridge device is detected, if the impedance value is zero, the wiring is correct, and if the impedance value is not zero, the C-phase voltage loop has a breakpoint.

7. The method according to claim 2 or 3, wherein the impedance value of the current loop is detected, the connection loop connection point is adjusted according to the detection result of the impedance value after the connection condition of the current loop is judged according to the detection result, and the impedance value of the loop is repeatedly measured until the impedance value is zero, and then step S2 is performed.

8. The method according to any one of claims 4 to 6, wherein the impedance value of the voltage loop is detected, after the wiring condition of the voltage loop is judged according to the detection result, the adjustment of the connection loop connection point is performed according to the detection result of the impedance value, and the measurement of the impedance value of the loop is repeated until the impedance value is zero.

Technical Field

The invention belongs to the field of electronic measurement, and relates to a wiring detection method of a three-phase three-wire metering device with a mutual inductor.

Background

Along with the development of social electricity utilization, the updating and upgrading of an electric energy metering technology and the deepened application of a power supply department to the intelligent electric meter, the replacement frequency and the workload of the electric meter are greatly improved, the situation that the metering is abnormal due to the fact that wiring errors of the electric meter occur is increased, particularly, the probability of wrong wiring of a metering device with a mutual inductor is higher, the electric quantity of missed metering is also higher, and the difficulty of recovering the electric charge is increased.

There are two main reasons for the occurrence of wiring errors in metering devices: firstly, the wiring is not checked according to the working procedures after the installation is finished; and secondly, the conventional wiring inspection mode needs to disassemble the conducting wire for measurement, so that misconnection or missing connection is easily caused when the subsequent wiring is recovered. In order to ensure the accuracy of electric energy metering, a power supply department also takes a plurality of management measures, including setting up the installation specification and the process of the electric meter. According to case analysis, when most wrong wiring occurs, the wiring is disconnected after the wiring is installed, particularly when a meter is newly installed or sealed, the field is generally not powered, the wiring of a metering device cannot be checked by using a check meter, and a buzzer on a universal meter is generally adopted to judge whether the wiring is in the field, but the following problems exist: 1. because the length of a meter pen and a measuring line configured by the multimeter is limited, the field inspection has certain difficulty; 2. CT and PT are generally arranged at the back of a metering cabinet, two persons are required to be arranged in front of the metering cabinet and behind the metering cabinet during verification, and the operation is carried out simultaneously, so that errors can be easily judged under the condition of not-in-place communication; 3. because the buzzer judges the on-off of the line by adopting a direct current power supply mode, when the wiring is checked, the wiring of the line can be accurately judged only by disconnecting the wiring ends corresponding to the CT and the PT, so that the complexity of line inspection is increased, and the possibility of wrong wiring is also existed when the line is restored.

Disclosure of Invention

The technical problem to be solved by the embodiment of the invention is that when the measurement loop is detected and verified, the disconnection operation is required, the risk of connection error or polarity reversal is increased, the operation for determining an error point is complex, and the efficiency is low.

In one aspect of the invention, a method for detecting the wiring of a three-phase three-wire metering device with a mutual inductor is provided, which comprises the following steps:

step S1, measuring the target metering device by using the bridge device with the impedance measuring loop, detecting the impedance value of the current loop, and judging the wiring condition of the current loop according to the detection result;

and step S2, measuring the target metering device by using the bridge device with the impedance measuring loop, detecting the impedance value of the voltage loop, and judging the wiring condition of the voltage loop according to the detection result.

Preferably, the step S1 detects the impedance value of the current loop, and the determining the wiring condition of the current loop according to the detected result includes,

measuring an A-phase current loop, disconnecting a junction box connecting sheet LA1 of a metering device, connecting a terminal KA1 and a terminal A4 respectively by using a measuring clamp of a bridge device, starting the bridge device, detecting the result of the impedance value of the bridge device, if the result of the reactance value is not zero, correctly wiring the CT to the junction box, if the result of the resistance value is zero, the polarities of two ends of the wiring are opposite, and if the result of the resistance value is infinite, a disconnection point exists in the current loop;

closing a junction box connecting piece LA1 of the metering device, starting the bridge device again, detecting the result of the impedance value of the A-phase current loop, and if the result of the resistance value is zero, the loop of the whole metering device is correctly wired; if the result of the reactance value is not zero, a disconnection point exists in the wiring loop from the junction box to the electric meter.

More specifically, the step S1 detects the impedance value of the current loop, and determines the wiring condition of the current loop according to the detected result,

measuring a C-phase current loop, disconnecting a junction box connecting sheet LC1 of the metering device, connecting a terminal KC1 and a terminal C4 respectively by using a measuring clamp of a bridge device, starting the bridge device, detecting the result of the impedance value of the bridge device, if the result of the reactance value is not zero, correctly wiring the CT to the junction box, if the result of the resistance value is zero, the polarities of two ends of the wiring are opposite, and if the result of the resistance value is infinite, a disconnection point exists in the current loop;

closing the junction box connecting piece LC1 of the metering device, starting the bridge device again, detecting the impedance value result of the C-phase current loop, and if the resistance value result is zero, the loop wiring of the whole metering device is correct; if the result of the reactance value is not zero, a disconnection point exists in the wiring loop from the junction box to the electric meter.

Further, after the impedance value of the current loop is detected, and the connection condition of the current loop is determined according to the detection result, the connection point of the connection loop is adjusted according to the detection result of the impedance value, and the impedance value of the connection loop is repeatedly measured until the impedance value is zero, and then step S2 is performed.

Preferably, the step S2 detects the impedance value of the voltage loop, and the determining the connection condition of the voltage loop according to the detected result includes,

the A-phase voltage loop is measured, measuring clamps of the bridge device are respectively connected with the terminal PA1 and the terminal PA2, the bridge device is started, the impedance value of the bridge device is detected, if the impedance value is zero, the wiring is correct, and if the impedance value is not zero, a breakpoint exists in the A-phase voltage loop.

Specifically, the step S2 detects the impedance value of the voltage loop, determines the connection condition of the voltage loop according to the detected result,

and measuring a B-phase voltage loop, connecting measuring clamps of the bridge device to a terminal PB1 and a terminal PB2 respectively, starting the bridge device, detecting the result of the impedance value of the bridge device, and if the result of the impedance value is zero, correctly wiring, and if the result of the impedance value is not zero, a breakpoint exists in the B-phase voltage loop.

Specifically, the step S2 detects the impedance value of the voltage loop, determines the connection condition of the voltage loop according to the detected result,

the C-phase voltage loop is measured, the measuring clamp of the bridge device is respectively connected with the terminal PC1 and the terminal PC2, the bridge device is started, the impedance value of the bridge device is detected, if the impedance value is zero, the wiring is correct, and if the impedance value is not zero, the C-phase voltage loop has a breakpoint.

Further, the impedance value of the voltage loop is detected, after the wiring condition of the voltage loop is judged according to the detection result, the connection loop connection point is adjusted according to the detection result of the impedance value, and the impedance value of the loop is repeatedly measured until the impedance value is zero.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is within the scope of the present invention for those skilled in the art to obtain other drawings based on the drawings without inventive exercise.

Fig. 1 is a schematic main flow chart of a wiring detection method of a three-phase three-wire metering device with a transformer according to an embodiment of the invention.

FIG. 2 is a circuit connection diagram of a metering device of the wiring detection method of the three-phase three-wire metering device with the mutual inductor provided by the invention

The embodiment of the invention has the following beneficial effects:

according to the wiring detection method for the three-phase three-wire metering device with the mutual inductor, provided by the embodiment of the invention, the effective detection of the metering device is realized by checking the impedance values of the current loop and the voltage loop in the metering loop only through the bridge device without electricity and without disassembling the wiring, the wiring error or polarity reverse connection risk is reduced, the wiring error point is accurately locked, the working efficiency is improved, and unnecessary power supply and utilization disputes are reduced.