CN204374405U - Electric power meter field-checking three-phase simulation load device - Google Patents

Abstract

The utility model discloses a three-phase analog load device for on-site verification of an electric energy metering device, which comprises a three-phase analog load. The three-phase analog load is three groups of inductance coils, and each group of inductance coils is wound on a cylindrical iron core. and an electric energy metering device for detecting the electric energy of the three-phase analog load; and a connection line for connecting the three-phase analog load and the electric energy metering device; and a switch for switching the three-phase analog load, which is connected in series Between the three-phase analog load and the three-phase power supply; and an indicator light used to indicate the size of the analog load. The utility model ensures the safe, accurate and reliable operation of the metering device after the substation line runs under load; the utility model is small in size, convenient to carry, practical and flexible.

Description

Three-phase analog load device for on-site verification of electric energy metering device

technical field

The utility model belongs to the technical field of electric energy metering, in particular to a three-phase analog loader for on-site verification of electric energy metering devices.

Background technique

In practical applications, the on-site calibrator of the electric energy metering device is usually used to check the wiring of the secondary circuit of electric energy metering. The wiring inspection and judgment of the secondary circuit of electric energy metering can only be carried out when the electric energy meter is loaded, so it cannot be done on the day of power transmission. After completing the wiring inspection under live conditions, it is necessary to wait until the line is loaded, and then go to the site for wiring inspection again. If the error is not found through the wiring inspection in time, a safety accident or an economic accident will occur, and the consequences will be disastrous. In order to ensure the safe operation of the power grid and the accuracy and reliability of the measurement, it is very necessary to check the wiring of the electric energy meter before the line is loaded.

According to the measurement principle of the electric energy meter field tester, no matter the three-phase three-wire electric energy meter or the three-phase four-wire electric energy meter, if the field calibrator of the electric energy metering device is used to check the wiring of the electric energy meter, the line measured by the electric energy meter must have For a certain load, considering the no-load operation of the newly-built substation after power transmission, only the on-site calibrator of the electric energy metering device cannot complete the wiring inspection of the electric energy meter of the no-load line.

Utility model content

In order to solve the above problems, the utility model provides a three-phase analog load device for on-site verification of electric energy metering devices.

In order to achieve the above object, the utility model adopts the following technical solutions:

A three-phase analog load device for on-site verification of electric energy metering devices, including a three-phase analog load, the three-phase analog load is three groups of inductance coils, each group of inductance coils is wound on a cylindrical iron core; and used for An electric energy metering device for detecting the electric energy of the three-phase analog load; and a connection line for connecting the three-phase analog load and the electric energy meter; and a switch for switching the three-phase analog load, which is connected in series with the three-phase analog load and the three-phase power supply; and the indicator light used to indicate the size of the simulated load.

The connection line used to connect the three-phase analog load and the electric energy metering device includes the current lead-out line of the three-phase analog load and the voltage connection line of the three-phase analog load, and the voltage connection line of the three-phase analog load is connected to the electric energy The voltage port of the metering device, the three-phase analog load current lead-out line is connected to the current port of the electric energy metering device.

The electric energy metering device is a three-phase three-wire electric energy meter.

The indicator light is connected in series on the three-phase analog load current lead-out line between the three-phase analog load current lead-out port and the current port of the electric energy metering device.

The three-phase analog load current lead-out wires are several strands of copper wires wound on the inductance coil.

The cylindrical iron core is a hollow cylindrical iron core.

A three-phase analog load device for on-site verification of electric energy metering devices, including a three-phase analog load, the three-phase analog load is three groups of inductance coils, each group of inductance coils is wound on a cylindrical iron core; and used for An electric energy metering device for detecting the electric energy of the three-phase analog load; and a connection line for connecting the three-phase analog load and the electric energy meter; and a switch for switching the three-phase analog load, which is connected in series with the three-phase analog load and the three-phase power supply; and the indicator light used to indicate the size of the simulated load; the electric energy metering device is a three-phase four-wire electric energy meter.

The connecting wire used to connect the three-phase analog load and the electric energy metering device includes the current lead-out wire of the three-phase analog load, the voltage connection wire of the three-phase analog load and the zero-line lead-out wire of the three-phase analog load; The voltage connection line of the phase analog load is connected to the voltage port of the electric energy metering device, the current lead-out line of the three-phase analog load is connected to the current port of the electric energy metering device, and the zero line lead-out line of the three-phase analog load is connected to the zero line of the electric energy metering device. line port.

The indicator light is connected in series on the three-phase analog load current lead-out line between the three-phase analog load current lead-out port and the current port of the electric energy metering device.

The three-phase analog load current lead-out wires are several strands of copper wires wound on the inductance coil.

The beneficial effects of the utility model are:

The utility model proposes a three-phase analog load device for on-site verification of the electric energy metering device, which can add a simulated three-phase load when the electric energy metering device of the substation has no load. The metering device performs wiring inspection; it ensures the safe, accurate and reliable operation of the metering device after the substation line runs under load; the utility model is small in size, easy to carry, practical and flexible.

Description of drawings

Fig. 1 is the electrical schematic diagram of the present utility model;

Fig. 2 is the wiring diagram of the three-phase three-wire analog load device of the present utility model;

Fig. 3 is a wiring diagram of the three-phase four-wire analog load device of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described further:

As shown in Figure 1, a three-phase analog load device for on-site verification of an electric energy metering device includes a three-phase analog load, and the three-phase analog load is three sets of inductance coils L1, L2 and L3, each of which is wound on A hollow cylindrical iron core; and an electric energy metering device for detecting the electric energy of the three-phase analog load; and a connecting line for connecting the three-phase analog load and the electric energy metering device; and for switching the three-phase analog load The switches K1, K2 and K3 are respectively connected in series between the three-phase analog load and the three-phase power supply; and the indicator lights HL1, HL2 and HL3 for indicating the size of the analog load; the electric energy metering device is an electric energy meter.

The size of each group of inductance coils is 0.154H; the switches K1, K2, and K3 for load switching are set according to the size of the required simulated load; the voltage connection line of the simulated load is connected to the voltage port at the end of the electric energy meter Single-strand copper wire, the three-phase current lead-out wire is a multi-strand copper wire wound on the inductance coil; the three indicator lights HL1, HL2, and HL3 are set corresponding to the three-phase load, and the indicator light HL1 is connected in series A-phase current lead-out line, indicator light HL2 is connected in series with B-phase current lead-out line, indicator light HL3 is connected in series with C-phase current lead-out line, to indicate the size of switching load.

Figure 2 shows the wiring diagram of the utility model's three-phase three-wire analog load device. The A-phase current lead of the three-phase analog load is connected to the A-phase current port of the electric energy meter; the C-phase current lead of the three-phase analog load is connected to the C-phase current port of the electric energy meter; the A-phase voltage lead of the three-phase analog load is connected to the electric energy meter A Phase voltage port; the C-phase voltage lead of the three-phase analog load is connected to the C-phase voltage port of the electric energy meter; the N-phase voltage lead of the three-phase analog load is connected to the B-phase voltage port of the electric energy meter.

Figure 3 shows the wiring diagram of the three-phase four-wire analog load device of the utility model. The A-phase current lead of the three-phase analog load is connected to the A-phase current port of the electric energy meter; the B-phase current lead of the three-phase analog load is connected to the B-phase current port of the electric energy meter; the C-phase current lead of the three-phase analog load is connected to the electric energy meter C Phase current port; A-phase voltage lead of the three-phase analog load is connected to the A-phase voltage port of the electric energy meter; B-phase voltage lead of the three-phase analog load is connected to the B-phase voltage port of the electric energy meter; C-phase voltage lead of the three-phase analog load Connect the C-phase voltage port of the electric energy meter; connect the N-phase lead of the three-phase analog load to the N-phase port of the electric energy meter.

The N phase of the three-phase simulated load device is the neutral line of the three-phase simulated load device.

The phase voltage of the three-phase three-wire electric energy meter is 57.7V, and the phase voltage of the three-phase four-wire electric energy meter is 220V. In order to ensure the sensitivity and safety of the three-phase analog load device calibration, the rated voltage of the analog load device is 300V, and the load power is 3kW.

The usage steps of the three-phase analog load device for on-site verification of the electric energy metering device of the present utility model are as follows:

(1) According to the wiring mode of the electric energy meter, determine the wiring mode of the three-phase analog load device, connect the voltage port and current port of the three-phase analog load device to the voltage port and current port of the electric energy meter in turn; select the switches K1, K2 and K3 Hit the score;

(2) According to the actual operating conditions, select switches K1, K2 and K3 to connect the three-phase load to work. The selector switch has three grades: zero load, half load, and full load. Check whether the indicator light is working normally. After confirming that it is normal Start on-site inspection work;

(3) After the on-site verification is completed, the voltage input of the electric energy meter should be disconnected first, and check whether the indicator light of the three-phase analog load is off. After the indicator light is off, the voltage and current connection line can be disconnected to end the work.

Although the specific implementation of the utility model has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the utility model. Those skilled in the art should understand that on the basis of the technical solution of the utility model, those skilled in the art do not need to Various modifications or deformations that can be made with creative efforts are still within the protection scope of the present utility model.

Claims (10)

1. A three-phase analog load device for on-site verification of an electric energy metering device is characterized in that it comprises a three-phase analog load, and the three-phase analog load is three groups of inductance coils, and each group of inductance coils is wound on a cylindrical iron core; and An energy metering device for detecting the magnitude of the electrical energy of the three-phase simulated load; and Connection wires for connection between three-phase simulated loads and energy metering devices; and A switch for switching the three-phase analog load, which is connected in series between the three-phase analog load and the three-phase power supply; and Indicator light to indicate the size of the simulated load. 2. The three-phase analog load device for on-site verification of an electric energy metering device as claimed in claim 1, wherein the connecting wire for connecting the three-phase analog load and the electric energy metering device includes a three-phase The current lead-out line of the simulated load and the voltage connection line of the three-phase simulated load, the voltage connection line of the three-phase simulated load is connected to the voltage port of the electric energy metering device, and the current lead-out line of the three-phase simulated load is connected to the current of the electric energy metering device port. 3. A three-phase analog load device for on-site verification of an electric energy metering device according to claim 2, wherein the electric energy metering device is a three-phase three-wire electric energy meter. 4. A three-phase analog load device for on-site verification of an electric energy metering device as claimed in claim 1, wherein the indicator light is connected in series between the current lead-out port of the three-phase analog load and the current port of the electric energy metering device The three-phase analog load current lead-out line between them. 5. A kind of three-phase analog load device for on-site verification of electric energy metering device as claimed in claim 2 or 4, it is characterized in that, the described three-phase analog load current lead-out wire is several strands of copper wound on the inductance coil wire. 6. A three-phase analog load device for on-site verification of an electric energy metering device according to claim 1, wherein the cylindrical iron core is a hollow cylindrical iron core. 7. A three-phase analog load device for on-site verification of an electric energy metering device, characterized in that it comprises a three-phase analog load, and the three-phase analog load is three groups of inductance coils, each group of inductance coils is wound on a cylindrical iron core; and An energy metering device for detecting the magnitude of the electrical energy of the three-phase simulated load; and Connection wires for connection between three-phase simulated loads and energy metering devices; and A switch for switching the three-phase analog load, which is connected in series between the three-phase analog load and the three-phase power supply; and An indicator light for indicating the size of the simulated load; the electric energy metering device is a three-phase four-wire electric energy meter. 8. The three-phase analog load device for on-site verification of an electric energy metering device as claimed in claim 7, wherein the connecting wire for connecting the three-phase analog load and the electric energy metering device includes a three-phase The current lead-out line of the simulated load, the voltage connecting line of the three-phase simulated load and the zero-line lead-out line of the three-phase simulated load; the voltage connecting line of the three-phase simulated load is connected to the voltage port of the electric energy metering device, and the The current lead-out line is connected to the current port of the electric energy metering device, and the zero-line lead-out line of the three-phase analog load is connected to the zero-line port of the electric energy metering device. 9. A three-phase analog load device for on-site verification of an electric energy metering device as claimed in claim 7, wherein the indicator light is connected in series between the current lead-out port of the three-phase analog load and the current port of the electric energy metering device The three-phase analog load current lead-out line between them. 10. A three-phase analog load device for on-site verification of electric energy metering devices as claimed in claim 8 or 9, wherein the three-phase analog load current lead-out wires are several strands of copper wound on the inductance coil wire.