CN114089245A - Meter checking instrument - Google Patents
Meter checking instrument Download PDFInfo
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- CN114089245A CN114089245A CN202111382401.4A CN202111382401A CN114089245A CN 114089245 A CN114089245 A CN 114089245A CN 202111382401 A CN202111382401 A CN 202111382401A CN 114089245 A CN114089245 A CN 114089245A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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Abstract
The application relates to a meter testing instrument, including: a virtual load module and a field check module; one end of the virtual load module is connected with the electric energy meter, one end of the field verification module is connected with the electric energy meter, and the virtual load module is used for inputting virtual load current to the electric energy meter so that the current of the electric energy meter meets preset conditions, and therefore the field verification module can verify the electric energy meter. The on-site check work of the electric energy meter under the condition that the electric load of the user is low or no load is met, and the problem of on-site check of the electric energy meter when the user is newly on or the electric load is low is solved.
Description
Technical Field
The application relates to the technical field of electrical equipment, in particular to a meter testing instrument.
Background
The accuracy of electric energy measurement is very important to the user of power consumption, however, because the measurement of the new generation measuring instrument is more accurate, and the sudden increase of electric quantity caused by occasional weather changes causes some users to doubtful the accuracy of the meter measurement, the user can apply for the staff to check the meter at home, and the working principle of the meter used by the staff is mostly a standard electric energy meter method.
In the standard electric energy meter method, the current flowing through the electric energy meter needs to reach a certain magnitude (the measured power is about 2000W) to be stably checked. Therefore, in the field calibration process, the power utilization condition of the user cannot be accurately calibrated when the power utilization condition is an empty load or a light load, and the user needs to turn on a high-power electric appliance, so that the inconvenience of the user is increased. And the condition that the user is out of the site and cannot be matched with the checklist due to the fact that the door-to-door time is appointed can cause the secondary door-to-door of the working personnel, and the workload is increased.
Disclosure of Invention
Therefore, in order to solve the technical problems, a meter checking instrument is needed to be provided, which can meet the field check work of the electric energy meter under the condition that the electric load of a user is low or no load, and solves the problem of field check of the electric energy meter when the user is newly on or off with low electric load.
A meter reading apparatus comprising:
a virtual load module and a field check module;
one end of the virtual load module is connected with the electric energy meter, one end of the field verification module is connected with the electric energy meter, and the virtual load module is used for inputting virtual load current to the electric energy meter so that the current of the electric energy meter meets preset conditions, and therefore the field verification module can verify the electric energy meter.
In one embodiment, the dummy load module comprises a transformer, a current limiting resistor and a switch control unit;
one end of the transformer is connected with a mains supply, the other end of the transformer is connected with a current-limiting resistor, and the current-limiting resistor is connected with the switch control unit.
In one embodiment, the current limiting resistor includes R1, R2, and R3.
In one embodiment, the switch control unit comprises a switch S7 and a switch S8; connecting the L, N end of the commercial power into a transformer, and connecting R1 to a switch S7 to be used as an In end of current; and/or R2 and R3 are connected to the switch S8 In parallel and used as the In end of current; the current of the transformer acts as the out terminal for the current.
In one embodiment, the field verification module comprises a Ua port, a Ub port, a Uc port, a Un port; the virtual load module comprises an IaIn1 end, an IaOut1 end, an IbIn1 end, an IbOut1 end, an IcIn1 end, an IcOut1 end, a switch S1, a switch S2, a switch S3, a switch S4, a switch S5 and a switch S6.
In one embodiment, the electric energy meter comprises a first port, a second port, a third port, a fourth port, a fifth port, a sixth port, a seventh port, an eighth port, a ninth port and a tenth port.
In one embodiment, the field verification module comprises a direct access sub-module, wherein the direct access sub-module comprises an IaIn2 terminal, an IaOut2 terminal, an IbIn2 terminal, an IbOut2 terminal, an IcIn2 terminal and an IcOut2 terminal;
accessing a Ua port into a second port of the electric energy meter, accessing a Ub port into a fifth port of the electric energy meter, accessing a Uc port into an eighth port of the electric energy meter, and accessing a Un port into a tenth port of the electric energy meter;
the IaIn1 end of the virtual load module is connected with the IaIn2 end of the direct access type sub-module, the IaOut2 end of the direct access type sub-module is connected with the first port of the electric energy meter, and the third port of the electric energy meter is connected with the IaOut1 end of the virtual load module; the switch S1 and the switch S2 realize the current control of the A-phase virtual load module;
an IbIn1 end of the virtual load module is connected with an IbIn2 end of the direct access type sub-module, an IbOut2 end of the direct access type sub-module is connected with a fourth port of the electric energy meter, and a sixth port of the electric energy meter is connected with an IbOut1 end of the virtual load module; the switch S3 and the switch S4 realize the current control of the B-phase virtual load module;
the IcIn1 end of the virtual load module is connected with the IcIn2 end of the direct access type submodule, the IcOut2 end of the direct access type submodule is connected with the seventh port of the electric energy meter, and the ninth port of the electric energy meter is connected with the IcOut1 end of the virtual load module; the switch S5 and the switch S6 implement current control of the C-phase dummy load module.
In one embodiment, the field verification module comprises a mutual inductor access sub-module which comprises an Ia end, an Ib end and an Ic end,
accessing a Ua port into a second port of the electric energy meter, accessing a Ub port into a fifth port of the electric energy meter, accessing a Uc port into an eighth port of the electric energy meter, and accessing a Un port into a tenth port of the electric energy meter;
connecting a current secondary loop A of the on-site current transformer with a first end and a third end of an electric energy meter, connecting a current secondary loop B with a fourth end and a sixth end of the electric energy meter, and connecting a current secondary loop C with a seventh end and a ninth end of the electric energy meter;
an IaIn1 end of the virtual load module is connected with a first port of the electric energy meter, an IaOut1 end of the virtual load module is connected with a third port of the electric energy meter, and the A-phase pincerlike mutual inductor is connected with an Ia end of the mutual inductor access type submodule and is clamped on an input line of an A-phase line and an IaIn1 end of the virtual load module; the switch S1 and the switch S2 realize the current control of the A-phase virtual load module;
an IbIn1 end of the virtual load module is connected with a fourth port of the electric energy meter, an IbOut1 end of the virtual load module is connected with a sixth port of the electric energy meter, and a B-phase pincerlike mutual inductor is connected with an Ib end of a mutual inductor access type submodule and is clamped on an input line of a B-phase line and an IbIn1 end of the virtual load module; the switch S3 and the switch S4 realize the current control of the B-phase virtual load module;
the IcIn1 end of the virtual load module is connected with the seventh port of the electric energy meter, the IcOut1 end of the virtual load module is connected with the ninth port of the electric energy meter, and the C-phase pincerlike mutual inductor is connected with the Ic end of the mutual inductor access sub-module and is clamped on the input lines of the C-phase line and the IcIn1 end of the virtual load module; the switch S5 and the switch S6 implement current control of the C-phase dummy load module.
According to the meter checking instrument, the virtual load current is input into the electric energy meter, the current passing through the electric energy meter meets the requirement under the condition of low power load or even no load, the field checking work of the electric energy meter under the condition of low power load or no load of a user is met, and the problem of field checking of the electric energy meter when the user is newly on or off the power load is solved.
Drawings
FIG. 1 is a schematic diagram of the construction of a meter according to one embodiment;
FIG. 2 is a schematic diagram of a virtual load module in one embodiment;
FIG. 3 is a schematic diagram of the wiring of an embodiment of a meter comprising a direct access sub-module;
FIG. 4 is a schematic diagram of the connections of a meter including the transformer access sub-module in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in FIG. 1, there is provided a meter testing apparatus 1 comprising
A virtual load module 3 and a field check module 4;
one end of the virtual load module 3 is connected with the electric energy meter 2, one end of the field check module 4 is connected with the electric energy meter 2, and the virtual load module 3 is used for inputting virtual load current to the electric energy meter 2 so that the current of the electric energy meter 2 meets preset conditions, and therefore the field check module 4 can check the electric energy meter.
Aiming at the fact that the virtual load module 3 and the field verification module 4 can be connected with each other or not connected with each other under certain conditions, virtual load current is input into the electric energy meter, the current passing through the electric energy meter can meet requirements (such as power reaching about 2000W) under the condition of low power load or no load, the field verification work of the electric energy meter under the condition of low power load or no load of a user is met, and the problem of field verification of the electric energy meter when the new user has no power load or the power load is low is solved.
In one embodiment, as shown in FIG. 2, a dummy load module is provided, comprising
The transformer T, the current-limiting resistor and the switch control unit;
one end of the transformer T is connected with a mains supply, the other end of the transformer T is connected with a current-limiting resistor, and the current-limiting resistor is connected with the switch control unit. The current limiting resistor comprises R1, R2 and R3; the switch control unit includes a switch S7 and a switch S8; the end of a commercial power L, N is connected into a transformer T, and an R1 is connected with a switch S7 and used as an In end of current; and/or R2 and R3 are connected to the switch S8 In parallel and used as the In end of current; the current of the transformer acts as the out terminal for the current.
In the embodiment of the application, the virtual load module and the field calibration module share the voltage jack, an additional power supply is not required to be added, the commercial power is directly used, and the power taking is convenient. The device mainly increases equipment such as small-size components and parts, compares with the meter checking appearance that uses before, and volume, weight do not have the change basically, make things convenient for the staff to go out to carry.
In one embodiment, as shown in fig. 3, a wiring diagram of a meter tester including a direct access sub-module is provided, specifically, a field check module of the meter tester includes a Ua port, a Ub port, a Uc port, and a Un port; the virtual load module comprises an IaIn1 end, an IaOut1 end, an IbIn1 end, an IbOut1 end, an IcIn1 end, an IcOut1 end, a switch S1, a switch S2, a switch S3, a switch S4, a switch S5 and a switch S6.
Further, when testing electricity, this meter appearance links to each other with the electric energy meter, and the electric energy meter includes first port, second port, third port, fourth port, fifth port, sixth port, seventh port, eighth port, ninth port and tenth port.
In a preferred embodiment, the field check module comprises a direct access sub-module, the direct access sub-module comprises an IaIn2 terminal, an IaOut2 terminal, an IbIn2 terminal, an IbOut2 terminal, an IcIn2 terminal, and an IcOut2 terminal;
aiming at the aspect of voltage connection, a Ua port is connected to a second port of the electric energy meter, a Ub port is connected to a fifth port of the electric energy meter, a Uc port is connected to an eighth port of the electric energy meter, and a Un port is connected to a tenth port of the electric energy meter;
aiming at the aspect of current wiring, when the direct access type sub-module is connected, a secondary loop of an on-site current transformer needs to be in short circuit, the secondary loop of the current is disconnected with the electric energy meter, the IaIn1 end of the virtual load module is connected with the IaIn2 end of the direct access type sub-module, the IaOut2 end of the direct access type sub-module is connected with a first port of the electric energy meter, and a third port of the electric energy meter is connected with the IaOut1 end of the virtual load module; the switch S1 and the switch S2 realize the current control of the A-phase virtual load module;
an IbIn1 end of the virtual load module is connected with an IbIn2 end of the direct access type sub-module, an IbOut2 end of the direct access type sub-module is connected with a fourth port of the electric energy meter, and a sixth port of the electric energy meter is connected with an IbOut1 end of the virtual load module; the switch S3 and the switch S4 realize the current control of the B-phase virtual load module;
the IcIn1 end of the virtual load module is connected with the IcIn2 end of the direct access type submodule, the IcOut2 end of the direct access type submodule is connected with the seventh port of the electric energy meter, and the ninth port of the electric energy meter is connected with the IcOut1 end of the virtual load module; the switch S5 and the switch S6 realize the current control of the C-phase virtual load module; the aim of inputting the virtual load current to the electric energy meter by using the virtual load module is fulfilled when the user has no useful electric load or the electric load is low.
In one embodiment, as shown in fig. 4, a wiring diagram of a meter comprising a transformer access submodule is provided, the field verification module comprises the transformer access submodule, the transformer access submodule comprises an Ia terminal, an Ib terminal and an Ic terminal,
aiming at the aspect of voltage connection, a Ua port is accessed to a second port of the electric energy meter, a Ub port is accessed to a fifth port of the electric energy meter, a Uc port is accessed to an eighth port of the electric energy meter, and a Un port is accessed to a tenth port of the electric energy meter;
aiming at the aspect of current wiring, when the mutual inductor access sub-module is connected (the mutual inductor access sub-module comprises a mutual inductor, namely when the mutual inductor is accessed), the on-site current mutual inductor current secondary circuit A is connected with the first end and the third end of the electric energy meter, B is connected with the fourth end and the sixth end of the electric energy meter, and C is connected with the seventh end and the ninth end of the electric energy meter;
an IaIn1 end of the virtual load module is connected with a first port of the electric energy meter, an IaOut1 end of the virtual load module is connected with a third port of the electric energy meter, and the A-phase pincerlike mutual inductor is connected with an Ia end of the mutual inductor access type submodule and is clamped on an input line of an A-phase line and an IaIn1 end of the virtual load module; the switch S1 and the switch S2 realize the current control of the A-phase virtual load module;
an IbIn1 end of the virtual load module is connected with a fourth port of the electric energy meter, an IbOut1 end of the virtual load module is connected with a sixth port of the electric energy meter, and a B-phase pincerlike mutual inductor is connected with an Ib end of a mutual inductor access type submodule and is clamped on an input line of a B-phase line and an IbIn1 end of the virtual load module; the switch S3 and the switch S4 realize the current control of the B-phase virtual load module;
an IcIn1 end of the virtual load module is connected with a seventh port of the electric energy meter, an IcOut1 end of the virtual load module is connected with a ninth port of the electric energy meter, and the C-phase pincerlike mutual inductor is connected with an Ic end of the mutual inductor access type submodule and is clamped on an input line of a C-phase line and an IcIn1 end of the virtual load module; the switch S5 and the switch S6 realize the current control of the C-phase virtual load module; when the user has no electric load or the electric load is low, the virtual load module is used for inputting the virtual load current to the electric energy meter.
This meter checking instrument is on current meter checking instrument's basis, increase virtual load device, virtual load device's principle is for turning into the low-voltage with commercial power 220V through the transformer, control output undercurrent size through resistance and switch, and electric current and primary voltage keep apart, voltage wiring and current binding post insert the corresponding looks of electric energy meter respectively with virtual load device, switch over the current gear through the switch, the electric current that flows in the electric energy meter is nimble controlled, thereby satisfy the minimum current of meter checking instrument normal work, realize the function that the user does not have actual load or the accurate check-up of ammeter when user's stage nature power consumption is low newly. Every way electric current has the output regulation of three gears, divide into 1A, 2A and 3A gear, can satisfy the check-up of single-phase, three-phase table meter, possesses the universality.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A meter testing instrument, comprising:
a virtual load module and a field check module;
one end of the virtual load module is connected with the electric energy meter, one end of the field verification module is connected with the electric energy meter, and the virtual load module is used for inputting virtual load current to the electric energy meter so that the current of the electric energy meter meets preset conditions, and therefore the field verification module can verify the electric energy meter.
2. The meter of claim 1, wherein the dummy load module comprises a transformer, a current limiting resistor, a switch control unit;
one end of the transformer is connected with a mains supply, the other end of the transformer is connected with a current-limiting resistor, and the current-limiting resistor is connected with the switch control unit.
3. The meter gauge of claim 2, wherein the current limiting resistor comprises R1, R2, and R3.
4. The meter of claim 3, wherein the switch control unit comprises switch S7 and switch S8; the end of a commercial power L, N is connected into a transformer, and R1 is connected with a switch S7 and is used as an In end of current; and/or R2 and R3 are connected to the switch S8 In parallel and used as the In end of current; the current of the transformer acts as the out terminal for the current.
5. The meter of claim 1, wherein the field verification module comprises a Ua port, a Ub port, a Uc port, a Un port; the virtual load module comprises an IaIn1 end, an IaOut1 end, an IbIn1 end, an IbOut1 end, an IcIn1 end, an IcOut1 end, a switch S1, a switch S2, a switch S3, a switch S4, a switch S5 and a switch S6.
6. The meter experience of claim 5, wherein the power meter includes a first port, a second port, a third port, a fourth port, a fifth port, a sixth port, a seventh port, an eighth port, a ninth port, and a tenth port.
7. The meter gauge of claim 6, wherein the field verification module comprises a direct access sub-module comprising an IaIn2 terminal, an IaOut2 terminal, an IbIn2 terminal, an IbOut2 terminal, an IcIn2 terminal, and an IcOut2 terminal;
accessing a Ua port into a second port of the electric energy meter, accessing a Ub port into a fifth port of the electric energy meter, accessing a Uc port into an eighth port of the electric energy meter, and accessing a Un port into a tenth port of the electric energy meter;
an IaIn1 end of the virtual load module is connected with an IaIn2 end of the direct access type sub-module, an IaOut2 end of the direct access type sub-module is connected with a first port of the electric energy meter, and a third port of the electric energy meter is connected with an IaOut1 end of the virtual load module; the switch S1 and the switch S2 realize the current control of the A-phase virtual load module;
an IbIn1 end of the virtual load module is connected with an IbIn2 end of the direct access type sub-module, an IbOut2 end of the direct access type sub-module is connected with a fourth port of the electric energy meter, and a sixth port of the electric energy meter is connected with an IbOut1 end of the virtual load module; the switch S3 and the switch S4 realize the current control of the B-phase virtual load module;
the IcIn1 end of the virtual load module is connected with the IcIn2 end of the direct access type submodule, the IcOut2 end of the direct access type submodule is connected with the seventh port of the electric energy meter, and the ninth port of the electric energy meter is connected with the IcOut1 end of the virtual load module; the switch S5 and the switch S6 implement current control of the C-phase dummy load module.
8. The meter gauge of claim 6, wherein the field verification module comprises a transformer access sub-module comprising terminals Ia, Ib, Ic,
a Ua port is connected to a second port of the electric energy meter, a Ub port is connected to a fifth port of the electric energy meter, a Uc port is connected to an eighth port of the electric energy meter, and a Un port is connected to a tenth port of the electric energy meter;
connecting A of a current secondary loop of the on-site current transformer with a first end and a third end of an electric energy meter, connecting B with a fourth end and a sixth end of the electric energy meter, and connecting C with a seventh end and a ninth end of the electric energy meter;
an IaIn1 end of the virtual load module is connected with a first port of the electric energy meter, an IaOut1 end of the virtual load module is connected with a third port of the electric energy meter, and the A-phase pincerlike mutual inductor is connected with an Ia end of the mutual inductor access type submodule and is clamped on an input line of an A-phase line and an IaIn1 end of the virtual load module; the switch S1 and the switch S2 realize the current control of the A-phase virtual load module;
an IbIn1 end of the virtual load module is connected with a fourth port of the electric energy meter, an IbOut1 end of the virtual load module is connected with a sixth port of the electric energy meter, and a B-phase pincerlike mutual inductor is connected with an Ib end of a mutual inductor access type submodule and is clamped on an input line of a B-phase line and an IbIn1 end of the virtual load module; the switch S3 and the switch S4 realize the current control of the B-phase virtual load module;
the IcIn1 end of the virtual load module is connected with the seventh port of the electric energy meter, the IcOut1 end of the virtual load module is connected with the ninth port of the electric energy meter, and the C-phase pincerlike mutual inductor is connected with the Ic end of the mutual inductor access sub-module and is clamped on the input lines of the C-phase line and the IcIn1 end of the virtual load module; the switch S5 and the switch S6 implement current control of the C-phase dummy load module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111382401.4A CN114089245A (en) | 2021-11-22 | 2021-11-22 | Meter checking instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111382401.4A CN114089245A (en) | 2021-11-22 | 2021-11-22 | Meter checking instrument |
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| CN114089245A true CN114089245A (en) | 2022-02-25 |
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