Electric energy meter calibration system suitable for multiple wiring modes

Abstract

The utility model provides an electric energy meter calibration system suitable for multiple wiring modes, and the system comprises a standard signal platform body which is used for outputting a voltage signal and a current signal for testing an electric energy meter; the relay module realizes switching of multiple wiring modes of the electric energy meter based on opening and closing combination of a relay; the controller is used for collecting real-time metering parameters of the measured electric energy meter and carrying out meter calibration and parameter configuration on a corresponding wiring mode of the measured electric energy meter. According to the utility model, on the basis of not changing the design of the electric energy meter, the wiring mode of the electric energy meter is switched through the relay module, real-time metering data of the detected electric energy meter is read, and high-efficiency meter adjustment is realized.

Description

Technical Field

[0001] The utility model relates to the field of electric energy meter calibration, and more specifically, to an electric energy meter calibration system suitable for multiple wiring modes. Background Art

[0002] With economic development, the technology of electric energy meters has developed rapidly. Electric energy meters used by different users in different regions of different countries have different voltage levels, different current levels, and different wiring methods. Electric energy meters can be set through parameters to meet users' needs for different voltage and current levels and wiring methods. The realization of this technical requirement requires writing different calibration parameters to the measured electric energy meters according to different wiring scenarios to ensure the accuracy of measurement.

[0003] In electric meter manufacturing companies, the conventional calibration method follows the steps: 1. Connecting the electric meter, 2. The meter outputs the signal required for calibration, 3. Waiting for the meter signal to stabilize, 4. Obtaining the calibration parameters based on the meter signal, 5. Configuring the parameters into the meter.

[0004] Different calibration parameters need to be configured for different wiring methods. The above steps need to be repeated many times. In addition, the wiring of the electric energy meter is usually done manually, which requires a lot of manpower and time, and the calibration efficiency is low. Utility Model Content

[0005] The purpose of the utility model is to solve the problem of low efficiency in manual wiring of different wiring modes when calibrating an electric energy meter, and to propose an electric energy meter calibration system suitable for multiple wiring modes, which realizes the switching of the electric energy meter wiring mode through a relay module, outputs voltage and current signals of different calibration points through a standard signal station body, realizes the reading and writing of calibration parameters, and can improve the calibration efficiency of the electric energy meter.

[0006] The technical solution of the utility model is:

[0007] The utility model provides an electric energy meter calibration system adapted to multiple wiring modes, comprising:

[0008] Standard signal stage, used to output voltage and current signals for electric energy meter testing:

[0009] The relay module includes relays Q1-Q12, wherein the relays Q1-Q4 are respectively used to connect the voltage signal of the standard signal platform and the voltage interface of the electric energy meter; the relays Q5-Q8 are respectively used to connect the current signal of the standard signal platform and the direct current interface of the electric energy meter; the relays Q9-Q12 are respectively used to connect the current signal of the standard signal platform and the current interface of the electric energy meter, and mutual inductors are respectively connected in series on the three-phase wiring circuit; the switching of various wiring modes of the electric energy meter is realized based on the opening and closing combination of the relays Q1-Q12;

[0010] The electric energy meter under test and the controller are used to collect the real-time metering parameters of the electric energy meter under test and calibrate and configure the parameters of the corresponding wiring mode of the electric energy meter under test; the control signal end of the controller is respectively connected to the standard signal platform body and the relay module.

[0011] Furthermore, the voltage signals for testing the electric energy meter are Ua, Ub, Uc and Un; the current signals for testing the electric energy meter are Ia, Ib and Ic.

[0012] Furthermore, the current interface of the electric energy meter includes 6 terminals, Ia+, Ib+ and Ic+ represent current input, and Ia-, Ib- and Ic- represent current output.

[0013] Furthermore, the two ends of the relay Q9 are respectively connected to the current input interface Ia+ and the output interface Ia- of the electric energy meter, and the transformer CT1 is connected in series on the connection line; the two ends of the relay Q10 are respectively connected to the current input interface Ib+ and the output interface Ib- of the electric energy meter, and the transformer CT2 is connected in series on the connection line; the two ends of the relay Q11 are respectively connected to the current input interface Ia+ and the output interface Ia- of the electric energy meter, and the transformer CT3 is connected in series on the connection line; the two ends of the relay Q12 are respectively connected to the current input interface I0+ and the output interface Ia- of the electric energy meter.

[0014] Beneficial effects of the utility model:

[0015] The system of the utility model is composed of four modules, including a standard signal platform, a controller, a relay module and a tested electric energy meter; the system realizes the switching of direct and mutual induction wiring modes through the relay module, and can simultaneously complete the switching of four wiring modes, namely three-phase four-wire, three-phase three-wire, one-phase two-wire and one-phase three-wire. On the basis of not changing the design of the electric energy meter, the system generates a standard signal by controlling the signal source, switches the wiring mode, reads the real-time metering data of the tested electric energy meter, and realizes efficient meter calibration.

[0016] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0018] Figure 1 The utility model shows a block diagram of an electric energy meter calibration system suitable for multiple wiring modes;

[0019] Figure 2 A direct three-phase four-wire wiring diagram of an electric energy meter under test according to an embodiment of the utility model is shown;

[0020] Figure 3 A mutual inductance three-phase four-wire wiring diagram of an electric energy meter under test according to an embodiment of the utility model is shown. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein.

[0022] The utility model provides an electric energy meter calibration system suitable for multiple wiring modes, such as Figure 1 The system block diagram of the utility model is shown, and the system includes:

[0023] The standard signal platform is used to output voltage signals and current signals for testing the electric energy meter: the voltage signals for testing the electric energy meter are Ua, Ub, Uc and Un; the current signals for testing the electric energy meter are Ia, Ib and Ic; the current interface of the electric energy meter includes 6 terminals, Ia+, Ib+ and Ic+ represent current input, and Ia-, Ib- and Ic- represent current output.

[0024] The relay module includes relays Q1-Q12, wherein the relays Q1-Q4 are respectively used to connect the voltage signal of the standard signal platform and the voltage interface of the electric energy meter; the relays Q5-Q8 are respectively used to connect the current signal of the standard signal platform and the direct current interface of the electric energy meter; the relays Q9-Q12 are respectively used to connect the current signal of the standard signal platform and the current interface of the electric energy meter, and mutual inductors are respectively connected in series on the three-phase wiring circuit; the switching of various wiring modes of the electric energy meter is realized based on the opening and closing combination of the relays Q1-Q12;

[0025] The electric energy meter under test and the controller are used to collect the real-time metering parameters of the electric energy meter under test and calibrate and configure the parameters of the corresponding wiring mode of the electric energy meter under test; the control signal end of the controller is respectively connected to the standard signal platform body and the relay module.

[0026] Among them, the two ends of the relay Q9 are respectively connected to the current input interface Ia+ and the output interface Ia- of the electric energy meter, and the transformer CT1 is connected in series on the connection line; the two ends of the relay Q10 are respectively connected to the current input interface Ib+ and the output interface Ib- of the electric energy meter, and the transformer CT2 is connected in series on the connection line; the two ends of the relay Q11 are respectively connected to the current input interface Ia+ and the output interface Ia- of the electric energy meter, and the transformer CT3 is connected in series on the connection line; the two ends of the relay Q12 are respectively connected to the current input interface I0+ and the output interface Ia- of the electric energy meter.

[0027] When implementing:

[0028] The calibration process includes the following steps: Step 1, confirm and verify the wiring mode; Step 2, the controller controls the standard signal station to output a stable standard signal source through channel S1; Step 3, the controller switches the opening and closing of relays Q1-Q12 in the relay module through channel S2 to realize the corresponding wiring mode of the electric energy meter; Step 4, the controller obtains the real-time metering parameters of the tested electric energy meter through channel S3, and calibrates and configures the parameters of the corresponding wiring mode of the electric energy meter based on the metering parameters and the standard signal source; Step 5, after completing the calibration of the current wiring mode, return to step 1, switch the remaining wiring modes until all wiring modes are calibrated, and the calibration is completed.

[0029] The relay module realizes eight different wiring modes through the true value combination of relays Q1-Q12. When the control logic of the relay is 1, it means closed, and 0 means open.

[0030] Wherein, the relays Q1-Q4 are used to control the access of the standard signal platform voltage signal;

[0031] When the control logic of relays Q1-Q4 is 1111, the energy meter adopts three-phase four-wire wiring;

[0032] When the control logic of relays Q1-Q4 is 1110, the energy meter adopts three-phase three-wire wiring;

[0033] When the control logic of relays Q1-Q4 is 1001, the energy meter adopts one-phase two-wire wiring mode;

[0034] When the control logic of relays Q1-Q4 is 1101, the electric energy meter adopts a one-phase three-wire connection method.

[0035] When the electric energy meter adopts the three-phase four-wire connection method, if the control logic of relay Q5-Q12 is 11110000, the electric energy meter adopts the three-phase four-wire direct connection method; if the control logic of relay Q5-Q12 is 00001111, the electric energy meter adopts the three-phase four-wire mutual inductance connection method.

[0036] When the electric energy meter adopts the three-phase three-wire connection method, if the control logic of relay Q5-Q12 is 11100000, the electric energy meter adopts the three-phase three-wire direct connection method; if the control logic of relay Q5-Q12 is 00001110, the electric energy meter adopts the three-phase three-wire mutual inductance connection method.

[0037] When the electric energy meter adopts one-phase two-wire connection mode, if the control logic of relay Q5-Q12 is 10010001, the electric energy meter adopts one-phase two-wire direct connection mode; if the control logic of relay Q5-Q12 is 00011001, the electric energy meter adopts one-phase two-wire mutual inductance connection mode.

[0038] When the electric energy meter adopts a one-phase three-wire connection method, if the control logic of relay Q5-Q12 is 11010000, the electric energy meter adopts a one-phase three-wire direct connection method; if the control logic of relay Q5-Q12 is 00001101, the electric energy meter adopts a one-phase three-wire mutual inductance connection method.

[0039] In one example,

[0040] First, close Q1, Q2, Q3, and Q4 to ensure the access of the voltage signal. Figure 2 , 3 As shown, Q1-Q4 are all closed, indicating that voltages Ua, Ub, Uc, and Un are all connected, that is, the three-phase four-wire voltage signal is realized. After determining the voltage wiring method, direct current input and mutual inductance current input are realized by switching Q5-Q12.

[0041] like Figure 2 A direct three-phase four-wire connection diagram of an electric energy meter under test according to an embodiment of the utility model is shown. At this time, relays Q5-Q8 are closed, and Q9-Q12 are disconnected;

[0042] When Q5-Q8 are closed, the standard signal source inputs Ia+, Ib+, Ic+ currents to the meter terminals. After the current passes through the meter, it directly returns to Ia-, Ib-, Ic- of the signal source. At the same time, Q9-Q12 are disconnected, the transformer loop in the circuit is disconnected, the transformer has no signal and is in the disconnected state. At this time, direct current input is realized.

[0043] like Figure 3 A mutual inductance three-phase four-wire wiring diagram of a tested electric energy meter according to an embodiment of the utility model is shown. At this time, relays Q5-Q8 are disconnected and Q9-Q12 are closed; Ia+, Ib+, Ic+ current inputs are directly short-circuited to Ia-, Ib-, Ic- of the signal source, and the mutual inductors CT1, CT2, CT3 connected in series in the loop will induce secondary current, which enters the electric energy meter through the mutual inductance access port of the electric energy meter, thereby realizing mutual inductance current input.

[0044] The utility model switches the wiring mode of the electric energy meter through a relay module without changing the design of the electric energy meter, reads the real-time metering data of the electric energy meter being measured, and realizes high-efficiency meter adjustment.

[0045] The various embodiments of the utility model have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An electric energy meter calibration system suitable for multiple wiring modes, characterized in that include: Standard signal stage, used to output voltage and current signals for electric energy meter testing: The relay module includes relays Q1-Q12, wherein the relays Q1-Q4 are respectively used to connect the voltage signal of the standard signal platform and the voltage interface of the electric energy meter; the relays Q5-Q8 are respectively used to connect the current signal of the standard signal platform and the direct current interface of the electric energy meter; the relays Q9-Q12 are respectively used to connect the current signal of the standard signal platform and the current interface of the electric energy meter, and mutual inductors are respectively connected in series on the three-phase wiring circuit; the switching of various wiring modes of the electric energy meter is realized based on the opening and closing combination of the relays Q1-Q12; The electric energy meter under test and the controller are used to collect the real-time measurement parameters of the electric energy meter under test and calibrate and configure the parameters of the corresponding wiring mode of the electric energy meter under test; the control signal end of the controller is respectively connected to the standard signal platform body and the relay module.

2. The electric energy meter calibration system adapted to multiple wiring modes according to claim 1 is characterized in that: The voltage signals for testing the electric energy meter are Ua, Ub, Uc and Un; the current signals for testing the electric energy meter are Ia, Ib and Ic.

3. The electric energy meter calibration system adapted to multiple wiring modes according to claim 1 is characterized in that: The current interface of the electric energy meter includes 6 terminals, Ia+, Ib+ and Ic+ represent current input, and Ia-, Ib- and Ic- represent current output.

4. The electric energy meter calibration system adapted to multiple wiring modes according to claim 3 is characterized in that: The two ends of the relay Q9 are respectively connected to the current input interface Ia+ and the output interface Ia- of the electric energy meter, and the transformer CT1 is connected in series on the connection line; the two ends of the relay Q10 are respectively connected to the current input interface Ib+ and the output interface Ib- of the electric energy meter, and the transformer CT2 is connected in series on the connection line; the two ends of the relay Q11 are respectively connected to the current input interface Ia+ and the output interface Ia- of the electric energy meter, and the transformer CT3 is connected in series on the connection line; the two ends of the relay Q12 are respectively connected to the current input interface I0+ and the output interface Ia- of the electric energy meter.

Images