CN110632448B - A three-phase three-wire metering device wiring detection method with transformer - Google Patents

Abstract

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 a target metering device by using a bridge device with an impedance measuring loop, detecting the impedance value of a current loop of the target metering device, 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 metering device is effectively detected by checking the impedance values of the current loop and the voltage loop in the metering loop only through the bridge device without disconnecting the wires, the risk of wiring errors or polarity reversal is reduced, wiring error points are accurately locked, the working efficiency is improved, and unnecessary power supply and utilization disputes are reduced.

Description

A three-phase three-wire metering device wiring detection method with transformer

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 transformer.

Background technique

With the development of social electricity consumption and the upgrading of electric energy measurement technology, as well as the deepening of the application of smart meters by the power supply department, the frequency and workload of electric meter replacement have also been greatly increased, and the occurrence of meter wiring errors resulting in abnormal measurement has also increased. In particular, the metering device with the transformer has a higher probability of being connected to the wrong line, and the leakage of electricity is also larger, which increases the difficulty of electricity bill recovery.

There are two main reasons for the wrong wiring of the metering device: one is that the wiring is not checked according to the procedure after installation; the other is that the conventional wiring inspection method requires dismantling the wire for measurement, which is likely to cause misconnection or missed connection during subsequent wiring restoration. In order to ensure the accuracy of electric energy measurement, the power supply department has also taken many management measures, including formulating the installation specifications and procedures of electric meters. According to the case analysis, most of the wrong wiring occurs when the wiring is disconnected after installation, especially when the meter is newly installed or sealed, the site is generally not powered, and the calibrator cannot be used to check the wiring of the metering device. The "buzzer" on the multimeter is used to judge the correctness of the on-site wiring, but there are the following problems: 1. Due to the limited length of test leads and measurement lines configured by the multimeter, on-site inspection is difficult; 2. CT and PT are generally installed in the measuring cabinet In the back of the meter, two people are needed, one in front of the metering cabinet and the other in the back, and operate at the same time. If the communication is not in place, it is easy to judge the error; 3. Because the "buzzer" uses DC power to judge the circuit On and off, so when checking the wiring, it is necessary to disconnect the corresponding terminals of CT and PT to accurately judge the wiring of the line, which will increase the complexity of the line inspection, and there is also the possibility of wrong wiring when it is restored. sex.

SUMMARY OF THE INVENTION

The technical problem to be solved by the embodiments of the present invention is that when the metering loop is tested and verified, the wiring operation needs to be disconnected, which increases the risk of wiring errors or reverse polarity, and the operation for determining the error point is complicated and inefficient.

One aspect of the present invention provides a method for detecting the wiring of a three-phase three-wire metering device with a transformer, which includes the following steps:

Step S1, utilizes the bridge device with the impedance measurement loop to measure the target metering device, detects the impedance value of its current loop, and judges the current loop wiring condition according to the detected result;

In step S2, a bridge device with an impedance measurement loop is used to measure the target metering device, to detect the impedance value of the voltage loop thereof, and to determine the connection condition of the voltage loop according to the detection result.

Preferably, the impedance value of its current loop is detected in the step S1, and the current loop wiring condition is determined according to the detection result, including,

Measure the A-phase current loop, disconnect the junction box connecting piece LA1 of the metering device, use the measuring clip of the bridge device to connect the terminal KA1 and the terminal A4 respectively, start the bridge device, and check the result of its impedance value. If the result of the resistance value is zero, then the connection between the CT and the junction box is correct. If the result of the resistance value is zero, the polarities of both ends of the connection are opposite. If the result of the resistance value is infinite, there is a disconnection point in the current loop;

Close the junction box connecting piece LA1 of the metering device, start the bridge device again, and detect the result of the impedance value of the A-phase current loop. If the result of the resistance value is zero, the circuit wiring of the entire metering device is correct; if the result of the reactance value If not zero, there is a disconnection point in the wiring circuit from the junction box to the meter.

More specifically, the impedance value of its current loop is detected in the step S1, and the current loop wiring condition is judged according to the detection result, including,

Measure the C-phase current loop, disconnect the junction box connection piece LC1 of the metering device, use the measuring clip of the bridge device to connect the terminals KC1 and C4 respectively, start the bridge device, and check the result of its impedance value. If the result of the resistance value is zero, then the connection between the CT and the junction box is correct. If the result of the resistance value is zero, the polarities of both ends of the connection are opposite. If the result of the resistance value is infinite, there is a disconnection point in the current loop;

Close the junction box connection piece LC1 of the metering device, start the bridge device again, and detect the result of the impedance value of the C-phase current loop. If the result of the resistance value is zero, the circuit wiring of the entire metering device is correct; if the result of the reactance value If not zero, there is a disconnection point in the wiring circuit from the junction box to the meter.

Further, after the impedance value of the current loop is detected, after judging the wiring condition of the current loop 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 loop is repeatedly measured until the impedance value is zero. , and go to step S2.

Preferably, in the step S2, the impedance value of the voltage loop is detected, and the voltage loop wiring condition is determined according to the detection result, including:

Measure the A-phase voltage loop, connect the measuring clips of the bridge device to terminal PA1 and terminal PA2 respectively, start the bridge device, and detect the result of its impedance value. If the result of the impedance value is zero, the wiring is correct. If it is not zero, there is a breakpoint in the A-phase voltage loop.

Specifically, in the step S2, the impedance value of the voltage loop is detected, and the wiring condition of the voltage loop is determined according to the detection result, including:

Measure the B-phase voltage loop, connect the measuring clips of the bridge device to terminal PB1 and terminal PB2 respectively, start the bridge device, and detect the result of its impedance value. If the result of the impedance value is zero, the wiring is correct. If it is not zero, there is a breakpoint in the B-phase voltage loop.

Specifically, in the step S2, the impedance value of the voltage loop is detected, and the wiring condition of the voltage loop is determined according to the detection result, including:

Measure the C-phase voltage loop, connect the measuring clips of the bridge device to terminal PC1 and terminal PC2 respectively, start the bridge device, and detect the result of its impedance value. If the result of the impedance value is zero, the wiring is correct. If it is not zero, there is a breakpoint in the C-phase voltage loop.

Further, the impedance value of the voltage loop is detected, and after judging the connection of the voltage loop 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 loop is repeatedly measured until the impedance value is zero. .

Embodiment The embodiment of the present invention has the following beneficial effects:

The method for detecting the wiring of a three-phase three-wire metering device with a transformer provided by the embodiment of the present invention only uses the bridge device to verify the impedance value of the current circuit and the voltage circuit in the metering circuit under the condition that the bridge device is not charged and does not disconnect the wiring. The method realizes the effective detection of the metering device, reduces the risk of wrong wiring or reversed polarity, accurately locks the wrong point of the wiring, improves the work efficiency, and reduces unnecessary power supply and consumption disputes.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, obtaining other drawings according to these drawings still belongs to the scope of the present invention without any creative effort.

FIG. 1 is a schematic diagram of the main flow of an embodiment of the wiring detection method for a three-phase three-wire metering device with a transformer provided by the present invention.

Fig. 2 is the circuit connection diagram of the metering device of the three-phase three-wire metering device wiring detection method with transformer provided by the present invention

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

1 is a schematic diagram of the main flow of an embodiment of a method for detecting the connection of a three-phase three-wire metering device with a transformer provided by the present invention. In this embodiment, the method includes the following steps:

Step S1, utilizes the bridge device with the impedance measurement loop to measure the target metering device, detects the impedance value of its current loop, and judges the current loop wiring condition according to the detected result;

As shown in Figure 2, in one embodiment of the present invention, the A-phase current loop is measured, the junction box connecting piece LA1 of the metering device is disconnected, the measuring clip of the bridge device is used to connect the terminal KA1 and the terminal A4 respectively, and the bridge is started. The device detects the result of its impedance value. If the result of the reactance value is not zero, the connection between the CT and the junction box is correct. If the result of the resistance value is zero, the polarities of both ends of the connection are opposite. If the result of the resistance value is infinite, Then there is a disconnection point in the current loop;

Close the junction box connecting piece LA1 of the metering device, start the bridge device again, and detect the result of the impedance value of the A-phase current loop. If the result of the resistance value is zero, the circuit wiring of the entire metering device is correct; if the result of the reactance value If not zero, there is a disconnection point in the wiring circuit from the junction box to the meter.

More specifically, measure the C-phase current loop, disconnect the junction box connecting piece LC1 of the metering device, use the measuring clip of the bridge device to connect the terminal KC1 and the terminal C4 respectively, start the bridge device, and detect the result of its impedance value, if the reactance If the result of the resistance value is not zero, the connection between the CT and the junction box is correct. If the result of the resistance value is zero, the polarities of both ends of the connection are opposite. If the result of the resistance value is infinite, there is a disconnection point in the current loop;

Close the junction box connection piece LC1 of the metering device, start the bridge device again, and detect the result of the impedance value of the C-phase current loop. If the result of the resistance value is zero, the circuit wiring of the entire metering device is correct; if the result of the reactance value If not zero, there is a disconnection point in the wiring circuit from the junction box to the meter.

Further, after the impedance value of the current loop is detected, after judging the wiring condition of the current loop 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 loop is repeatedly measured until the impedance value is zero. , and go to step S2.

In this embodiment, in step S2, a bridge device with an impedance measurement loop is used to measure the target metering device, to detect the impedance value of its voltage loop, and to determine the connection of the voltage loop according to the detection result.

As shown in Figure 2, specifically, measure the A-phase voltage loop, connect the measuring clips of the bridge device to terminal PA1 and terminal PA2 respectively, start the bridge device, and detect the result of its impedance value. If the result of the impedance value is zero, Then the wiring is correct. If the result of the impedance value is not zero, there is a breakpoint in the A-phase voltage loop.

More specifically, measure the B-phase voltage loop, connect the measuring clips of the bridge device to terminal PB1 and terminal B2 respectively, start the bridge device, and detect the result of its impedance value. If the result of the impedance value is zero, the wiring is correct. If the result of the impedance value is not zero, there is a break in the B-phase voltage loop.

More specifically, measure the C-phase voltage loop, connect the measuring clips of the bridge device to terminal PC1 and terminal PC2 respectively, start the bridge device, and detect the result of its impedance value. If the result of the impedance value is zero, the wiring is correct. The result of the value is not zero, then there is a breakpoint in the C-phase voltage loop.

Further, the impedance value of the voltage loop is detected, and after judging the connection of the voltage loop 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 loop is repeatedly measured until the impedance value is zero. .

In the embodiment of the present invention, the inductance characteristics of the coils of the current transformer and the voltage transformer are used, combined with the typical wiring mode of the electric energy metering device, the inductance value of the metering loop is detected by the bridge, so as to determine whether the wiring is correct or not.

For more details, reference may be made to and combined with the foregoing description of the accompanying drawings, which will not be described in detail here.

Implementing the embodiment of the present invention has the following beneficial effects:

The embodiment of the present invention provides a method for detecting the wiring of a three-phase three-wire metering device with a transformer; a method for verifying the impedance value of the current circuit and the voltage circuit in the metering circuit only through the bridge device without the wiring being disconnected. It can effectively detect the metering device, reduce the risk of wiring errors or reverse polarity, accurately lock the wiring errors, improve work efficiency, and reduce unnecessary power supply disputes.

The above disclosure is only a preferred embodiment of the present invention, and of course, it cannot limit the scope of the rights of the present invention. Therefore, the equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims (4)

1. a three-phase three-wire metering device wiring detection method with transformer, is characterized in that, comprises the steps: Step S1, using a bridge device with an impedance measurement loop to measure the target metering device, detect the impedance value of its current loop, and determine the current loop wiring condition according to the detection result; Among them, measure the A-phase current loop, disconnect the junction box connection piece LA1 of the metering device, use the measuring clip of the bridge device to connect the terminal KA1 and the terminal A4 respectively, start the bridge device, and detect the result of its impedance value. If the result is not zero, the connection from CT to the junction box is correct. If the result of the resistance value is zero, the polarities of both ends of the connection are opposite. If the result of the resistance value is infinite, there is a disconnection point in the current loop; Among them, close the junction box connection piece LA1 of the metering device, start the bridge device again, and detect the result of the impedance value of the A-phase current loop. If the result of the resistance value is zero, the circuit wiring of the entire metering device is correct; if the reactance value If the result is not zero, there is a disconnection point in the wiring circuit from the junction box to the meter; Among them, measure the C-phase current loop, disconnect the junction box connection piece LC1 of the metering device, use the measuring clip of the bridge device to connect the terminals KC1 and C4 respectively, start the bridge device, and detect the result of its impedance value. If the result is not zero, the connection from CT to the junction box is correct. If the result of the resistance value is zero, the polarities of both ends of the connection are opposite. If the result of the resistance value is infinite, there is a disconnection point in the current loop; Among them, close the junction box connection piece LC1 of the metering device, start the bridge device again, and detect the result of the impedance value of the C-phase current loop. If the result of the resistance value is zero, the circuit wiring of the entire metering device is correct; if the reactance value If the result is not zero, there is a disconnection point in the wiring circuit from the junction box to the meter; Step S2, utilize the bridge device with impedance measurement loop to measure the target metering device, detect the impedance value of its voltage loop, and judge the voltage loop wiring condition according to the detection result; Among them, measure the A-phase voltage loop, connect the measuring clips of the bridge device to the terminal PA1 and the terminal PA2 respectively, start the bridge device, and detect the result of its impedance value. If the result of the impedance value is zero, the wiring is correct. The result is not zero, then there is a breakpoint in the A-phase voltage loop; Among them, measure the C-phase voltage loop, connect the measuring clips of the bridge device to the terminal PC1 and the terminal PC2 respectively, start the bridge device, and detect the result of its impedance value. If the result of the impedance value is zero, the wiring is correct. The result is not zero, then there is a breakpoint in the C-phase voltage loop; in: Terminals PA1 and PC1 are the A-phase connection terminals and C-phase connection terminals of the secondary side of the voltage transformer respectively; Terminals PA2 and PC2 are the A-phase voltage connection terminals and C-phase voltage connection terminals of the meter respectively; The terminal KA1 is the A-phase k1 terminal of the current transformer, and the terminal KA2 is the A-phase k2 terminal of the current transformer; The terminal KC1 is the C-phase k1 connection terminal of the current transformer, and the terminal KC2 is the C-phase k2 connection terminal of the current transformer; The connecting piece LA1 is the short connecting piece of the A-phase current loop of the junction box; The connecting piece LC1 is the short connecting piece of the C-phase current loop of the junction box; Terminal A4 is the terminal box A-phase current terminal; Terminal C4 is the C-phase current connection terminal of the junction box. 2. The method according to claim 1, wherein the impedance value of the voltage loop is detected in the step S2, and judging the connection condition of the voltage loop according to the detection result includes: Measure the B-phase voltage loop, connect the measuring clips of the bridge device to terminal PB1 and terminal PB2 respectively, start the bridge device, and detect the result of its impedance value. If the result of the impedance value is zero, the wiring is correct. If it is not zero, there is a breakpoint in the B-phase voltage loop; in: Terminal PB1 is the B-phase connection terminal of the secondary side of the voltage transformer; Terminal PB2 is the B-phase voltage connection terminal of the meter. 3. The method according to claim 1, wherein the impedance value of the current loop is detected, and after judging the current loop wiring condition according to the detected result, the connection loop connection point adjustment is performed according to the detection result of the impedance value, Repeat the measurement of the impedance value of the loop until the loop wiring of the entire metering device is correct, then go to step S2. 4. The method according to claim 2, wherein, the impedance value of the voltage loop is detected, and after judging the voltage loop wiring condition according to the detection result, the connection loop connection point adjustment is performed according to the detection result of the impedance value, Repeatedly measure the impedance value of the loop until the impedance value is zero.

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