Evaluation equipment and method for Rogowski coil type electric energy meter

Abstract

The invention discloses evaluation equipment and method for a Rogowski coil type electric energy meter, and relates to the field of Rogowski coils. A primary current and a primary voltage are generated through an electric energy meter calibrating device; the method comprises the following steps: generating alternating magnetic flux by using primary current through a standard current transformer, inducing secondary current based on the alternating magnetic flux, and inputting the secondary current into a coaxial shunt; the secondary current is converted into a voltage signal through the coaxial shunt and the voltage signal is input into the Rogowski coil type electric energy meter; the Rogowski coil type electric energy meter performs electric energy metering by using a voltage signal input by the coaxial shunt and a voltage signal output by the electric energy meter calibrating device, and outputs a power pulse to the electric energy meter calibrating device through the power pulse output interface. The electric energy meter calibrating device generates the standard pulses by using the primary current and the primary voltage generated by the electric energy meter calibrating device, and calculates the difference value between the number of the standard pulses generated in the unit time window and the number of the received power pulses to obtain the error value, so that accurate evaluation of the Rogowski coil type electric energy meter is realized.

Description

Technical Field

[0001] The present invention relates to the field of Rogowski coils, and in particular to an evaluation device and method for a Rogowski coil type electric energy meter. Background Art

[0002] In the prior art, an electric energy meter requires an external Rogowski coil (i.e., a Rogowski coil type electric energy meter) to complete the measurement of current and electric energy. This electric energy meter body does not contain a current sampling element, so its accuracy must be strictly controlled. The Rogowski coil outputs a voltage signal that is a fixed proportion to the primary current and needs to meet the specified accuracy level requirements. When the Rogowski coil is used in combination with the electric energy meter, the accuracy of the overall system must also meet the specified requirements. In actual applications, Rogowski coils and electric energy meters are not used in pairs one by one. When the specifications of the electric energy meter and the Rogowski coil are the same, different Rogowski coils can be used with different electric energy meters.

[0003] However, some existing Rogowski coils may have insufficient accuracy, which directly affects the accuracy verification of the electric energy meter body. In addition, existing electric energy meter verification devices usually provide the electric energy meter with primary current (through isolated CT) and primary voltage (through isolated PT), but these devices cannot generate secondary voltage-type signals corresponding to the primary current. Since the input port of the "external Rogowski coil electric energy meter" is designed to receive voltage signals, and the existing verification devices cannot provide such signals, the accuracy of the electric energy meter body cannot be fully verified during the verification process, thereby affecting the accuracy of the entire system. Therefore, the existing electric energy meter verification devices cannot fully meet the verification requirements of the "external Rogowski coil electric energy meter", especially in terms of ensuring high accuracy. Summary of the invention

[0004] In order to achieve accurate evaluation of a Rogowski coil type electric energy meter, the present invention proposes an evaluation device for a Rogowski coil type electric energy meter, wherein the Rogowski coil type electric energy meter measures electric energy by an external Rogowski coil, and comprises a current sampling interface, a voltage sampling interface and a power pulse output interface; the evaluation device comprises:

[0005] An electric energy meter calibration device comprising a current output port, a voltage output port, and a power pulse input interface, for generating a primary current and a primary voltage, and outputting them through the current output port and the voltage output port respectively; the voltage output port is electrically connected to a voltage sampling interface of a Rogowski coil type electric energy meter; the power pulse input interface is electrically connected to a power pulse output interface of the Rogowski coil type electric energy meter;

[0006] A standard current transformer is connected in series with the current output port of the electric energy meter verification device, and is used to generate an alternating magnetic flux through a primary current and induce a secondary current based on the alternating magnetic flux;

[0007] A coaxial shunt, whose input end is connected to the output of the standard current transformer, and whose output end is connected to the current sampling interface of the Rogowski coil type electric energy meter, is used to convert the secondary current into a voltage signal and input it into the Rogowski coil type electric energy meter; the Rogowski coil type electric energy meter is used to measure electric energy according to the voltage signal input by the coaxial shunt and the voltage signal output by the voltage output port in the electric energy meter verification device, and output power pulses to the electric energy meter verification device through the power pulse output interface;

[0008] The electric energy meter verification device is also used to generate standard pulses according to the primary current and primary voltage generated by it, and calculate the difference between the number of standard pulses generated within a unit time window and the number of power pulses received to obtain an error value.

[0009] Furthermore, the standard current transformer comprises: a primary side and a secondary side; wherein:

[0010] The primary side is connected in series with the current output port of the electric energy meter verification device; the primary side is used to generate alternating magnetic flux through the primary current; and the secondary side generates secondary current through electromagnetic induction under the action of the alternating magnetic flux.

[0011] Further, the primary side includes: a primary coil;

[0012] The current output port of the electric energy meter verification device outputs a primary current to the primary coil; the primary coil generates an alternating magnetic flux through the primary current.

[0013] Furthermore, the input end and the output end of the coaxial shunt both include a positive terminal and a negative terminal.

[0014] Further, the secondary side includes: a secondary coil, and a positive connection terminal S1 arranged at the positive end of the secondary coil and a negative connection terminal S2 arranged at the negative end of the secondary coil;

[0015] The secondary coil is connected to the positive terminal of the coaxial shunt input terminal through the positive connection terminal S1, and is connected to the negative terminal of the coaxial shunt input terminal through the negative connection terminal S2;

[0016] The positive terminal of the coaxial shunt output end is connected to the positive terminal of the current sampling interface of the Rogowski coil type electric energy meter, and the negative terminal of the coaxial shunt output end is connected to the positive terminal of the current sampling interface in the Rogowski coil type electric energy meter;

[0017] The secondary coil induces a secondary current based on the alternating magnetic flux generated by the primary coil and inputs the secondary current into the coaxial shunt.

[0018] The embodiment of the present invention further proposes an evaluation method for a Rogowski coil type electric energy meter, wherein the Rogowski coil type electric energy meter measures electric energy by an external Rogowski coil, and comprises a current sampling interface, a voltage sampling interface and a power pulse output interface; and is applied to an evaluation device, the device comprising:

[0019] An electric energy meter calibration device comprising a current output port, a voltage output port, and a power pulse input interface; the voltage output port is electrically connected to a voltage sampling interface of a Rogowski coil type electric energy meter; the power pulse input interface is electrically connected to a power pulse output interface of a Rogowski coil type electric energy meter;

[0020] A standard current transformer is connected in series with the current output port of the electric energy meter verification device;

[0021] A coaxial shunt, whose input end is connected to the output of a standard current transformer, and whose output end is connected to the current sampling interface of a Rogowski coil type electric energy meter; the evaluation method comprises:

[0022] A primary current and a primary voltage are generated through the electric energy meter verification device, and the primary current is output to a standard current transformer through a current output port, and the primary voltage is output to a voltage sampling interface of a Rogowski coil type electric energy meter through a voltage output port;

[0023] The primary current is used to generate an alternating magnetic flux through a standard current transformer, and the secondary current is induced based on the alternating magnetic flux and input into a coaxial shunt;

[0024] The secondary current is converted into a voltage signal through a coaxial shunt and input into a Rogowski coil type energy meter;

[0025] The Rogowski coil type electric energy meter uses the voltage signal input by the coaxial shunt and the voltage signal output by the voltage output port in the electric energy meter verification device to measure the electric energy, and outputs the power pulse to the electric energy meter verification device through the power pulse output interface;

[0026] The electric energy meter calibration device generates a standard pulse using the primary current and primary voltage generated by the electric energy meter, and calculates the difference between the number of standard pulses generated within a unit time window and the number of power pulses received to obtain an error value.

[0027] Furthermore, the evaluation method further comprises:

[0028] In the Rogowski coil type electric energy meter, the current conversion ratio corresponding to the original Rogowski coil is updated to the current conversion ratio of the corresponding standard current transformer.

[0029] The embodiment of the present invention further proposes an evaluation device for a Rogowski coil type electric energy meter, wherein the Rogowski coil type electric energy meter measures electric energy by an external Rogowski coil, and comprises a current sampling interface, a voltage sampling interface and a power pulse output interface; and is used for simultaneously evaluating multiple Rogowski coil type electric energy meters, wherein the evaluation device comprises:

[0030] An electric energy meter calibration device comprising a current output port, a voltage output port, and a plurality of power pulse input interfaces, for generating a primary current and a primary voltage, and outputting them through the current output port and the voltage output port respectively; the voltage output port is electrically connected to the voltage sampling interface of each Rogowski coil type electric energy meter; the power pulse input interface is connected to the power pulse output interface of the Rogowski coil type electric energy meter in a one-to-one correspondence;

[0031] A standard current transformer corresponding to the Rogowski coil type electric energy meter is connected in series with the current output port of the electric energy meter verification device, and is used to generate an alternating magnetic flux through the primary current, and induce a secondary current based on the alternating magnetic flux;

[0032] A coaxial shunt corresponding to a Rogowski coil type electric energy meter, whose input end is connected to the output of the corresponding standard current transformer, and whose output end is connected to the current sampling interface of the corresponding Rogowski coil type electric energy meter, is used to convert the secondary current into a voltage signal and input it into the corresponding Rogowski coil type electric energy meter;

[0033] The Rogowski coil type electric energy meter is used to measure electric energy according to the voltage signal input by the corresponding coaxial shunt and the voltage signal output by the voltage output port in the electric energy meter verification device, and output power pulses to the electric energy meter verification device through the corresponding power pulse output interface;

[0034] The electric energy meter calibration device is also used to generate standard pulses based on the primary current and primary voltage generated by it, and for each Rogowski coil type electric energy meter, calculate the difference between the number of standard pulses generated within a unit time window and the number of power pulses received from the electric energy meter, so as to obtain the error value corresponding to each Rogowski coil type electric energy meter.

[0035] Compared with the prior art, the present invention has at least the following beneficial effects:

[0036] (1) The present invention can generate a high-precision voltage signal by replacing the external Rogowski coil with a standard current transformer and a coaxial shunt. The signal can accurately reflect the primary current, which ensures that the electric energy meter can perform measurement based on accurate data when receiving the voltage signal;

[0037] (2) Standard current transformers have a high precision level (e.g., 0.01S or higher), which ensures the accuracy of the conversion process from primary current to secondary current. The coaxial shunt further reduces the phase shift and AC / DC difference, improving the quality of the voltage signal.

[0038] (3) The traditional evaluation method may require a special calibration device or parameter setting for each Rogowski coil of different models or specifications, while the present invention generates a universal voltage signal through a standard current transformer and a coaxial shunt, thereby simplifying the evaluation process; this method reduces manual intervention in the evaluation process, improves efficiency, reduces operational complexity, and also reduces errors caused by human errors;

[0039] (4) In the present invention, the electric energy meter verification device generates a standard pulse according to the generated primary current and primary voltage, and compares it with the actual power pulse output by the electric energy meter. This method provides a direct and reliable way to evaluate the accuracy of the electric energy meter; by calculating the difference between the number of standard pulses and the number of actual power pulses in a unit time window, the error value can be obtained, thereby intuitively reflecting the measurement accuracy of the electric energy meter;

[0040] (5) The electric energy meter calibration device includes multiple power pulse input interfaces, each of which is connected to a power pulse output interface of a Rogowski coil type electric energy meter in a one-to-one correspondence. This design allows the system to simultaneously receive power pulse signals from multiple electric energy meters. At the same time, each Rogowski coil type electric energy meter is equipped with a corresponding standard current transformer and coaxial shunt. These components ensure that each electric energy meter can independently receive accurate voltage signals for electric energy measurement;

[0041] (6) Traditional calibration methods usually require calibrating each electric energy meter one by one, which is not only time-consuming but also inefficient. However, the present invention can evaluate multiple electric energy meters at the same time through multi-channel design, greatly improving the evaluation efficiency;

[0042] (7) The electric energy meter calibration device generates standard pulses based on the generated primary current and primary voltage. These standard pulses are used as reference values ​​for comparison with the power pulses actually output by each electric energy meter. By calculating the difference between the number of standard pulses and the number of actual power pulses within a unit time window, the error value of each electric energy meter can be obtained. This method ensures that all electric energy meters are evaluated under the same conditions, ensuring the consistency and accuracy of the evaluation results;

[0043] (8) Since multiple energy meters can be evaluated simultaneously, the number of calibration devices required and the workload of operators are reduced. This not only reduces hardware costs, but also reduces labor costs;

[0044] (9) The design of the evaluation device of the present invention allows the number of electric energy meters to be evaluated to be increased or decreased flexibly by simply adjusting the corresponding interface connections. This flexibility allows the system to be expanded according to actual needs and adapt to testing needs of different scales. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a structural diagram of an evaluation device for a Rogowski coil type electric energy meter in Example 1;

[0046] Figure 2 This is a structural diagram of an evaluation device for a Rogowski coil type electric energy meter in Example 3.

[0047] In the figure:

[0048] 1. Electric energy meter calibration device; 2. Rogowski coil type electric energy meter; 21. Current sampling interface; 31. Secondary coil; 32. Iron core; 4. Coaxial shunt. DETAILED DESCRIPTION

[0049] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0050] Embodiment 1

[0051] Existing electric energy meter calibration devices usually provide primary current and primary voltage to the electric energy meter to calibrate the metering performance of the electric energy meter. Specifically:

[0052] Primary current: Provided by an isolation current transformer (CT). The function of the isolation CT is to convert the large current in the high voltage system into a small current that can be safely measured in the low voltage system while keeping the current ratio unchanged. This is done to protect the test equipment and ensure the safety of the operator.

[0053] Primary voltage: provided by an isolated voltage transformer (PT). Similarly, an isolated PT reduces the voltage of a high-voltage system to a safer, easier-to-handle level for accurate measurement. Likewise, it maintains the proportional relationship of the voltages so that the readings on the low-voltage side accurately reflect the conditions on the high-voltage side.

[0054] However, these traditional verification devices do not directly generate or process the secondary voltage type signal corresponding to the primary current. For the electric energy meter that relies on the Rogowski coil, its working principle is based on the Rogowski coil converting the primary current into a voltage signal proportional to it, which is then input into the electric energy meter for further processing. Therefore, traditional electric energy meter verification methods may not be directly applicable to this type of electric energy meter because they lack the ability to generate or simulate this specific form of secondary voltage signal. In this regard, Figure 1 As shown, the present invention proposes an evaluation device for a Rogowski coil type electric energy meter, wherein the Rogowski coil type electric energy meter realizes the measurement of electric energy by an external Rogowski coil, and comprises a current sampling interface, a voltage sampling interface and a power pulse output interface; the evaluation device comprises:

[0055] An electric energy meter calibration device comprising a current output port, a voltage output port, and a power pulse input interface, for generating a primary current and a primary voltage, and outputting them through the current output port and the voltage output port respectively; the voltage output port is electrically connected to a voltage sampling interface of a Rogowski coil type electric energy meter; the power pulse input interface is electrically connected to a power pulse output interface of the Rogowski coil type electric energy meter;

[0056] A standard current transformer is connected in series with the current output port of the electric energy meter verification device, and is used to generate an alternating magnetic flux through a primary current and induce a secondary current based on the alternating magnetic flux;

[0057] The standard current transformer comprises: a primary side and a secondary side; wherein:

[0058] The primary side is connected in series with the current output port of the electric energy meter verification device; the primary side is used to generate alternating magnetic flux through the primary current; and the secondary side generates secondary current through electromagnetic induction under the action of the alternating magnetic flux.

[0059] It should be noted that the standard current transformer is a high-precision current transformer with an accuracy level of 0.01S or higher. It converts primary current into secondary current, and maintains a fixed current conversion ratio K=I1 / I2 between the two, where I1 is the primary current and I2 is the secondary current. The design of the standard current transformer ensures high accuracy in the conversion process from primary current to secondary current.

[0060] A coaxial shunt, whose input end is connected to the output of the standard current transformer, and whose output end is connected to the current sampling interface of the Rogowski coil type electric energy meter, is used to convert the secondary current into a voltage signal and input it into the Rogowski coil type electric energy meter; the Rogowski coil type electric energy meter is used to measure electric energy according to the voltage signal input by the coaxial shunt and the voltage signal output by the voltage output port in the electric energy meter verification device, and output power pulses to the electric energy meter verification device through the power pulse output interface;

[0061] Specifically, the coaxial shunt is a precision resistive element designed to reduce AC / DC differences and phase shifts when measuring at high frequencies. It is based on a purely resistive squirrel cage coaxial structure that significantly reduces the loop inductance during current flow and virtually eliminates the mutual inductance effect between the voltage loop and the current loop.

[0062] That is to say, the present invention can generate a high-precision voltage signal by using a standard current transformer and a coaxial shunt to simulate an external Rogowski coil. The signal can accurately reflect the primary current, which ensures that the electric energy meter can perform measurement based on accurate data when receiving the voltage signal. At the same time, the present invention does not directly use the Rogowski coil, which solves the problem that the existing electric energy meter calibration device cannot provide a secondary voltage signal corresponding to the primary current. Without using the actual Rogowski coil, the present invention still realizes the effective evaluation of the electric energy meter body with an external Rogowski coil (i.e., the Rogowski coil type electric energy meter).

[0063] The primary side includes: a primary coil;

[0064] The current output port of the electric energy meter verification device outputs a primary current to the primary coil; the primary coil generates an alternating magnetic flux through the primary current.

[0065] The input end and the output end of the coaxial shunt both include a positive terminal and a negative terminal.

[0066] The secondary side includes: a secondary coil, and a positive connection terminal S1 arranged at the positive end of the secondary coil and a negative connection terminal S2 arranged at the negative end of the secondary coil;

[0067] The secondary coil is connected to the positive terminal of the coaxial shunt input terminal through the positive connection terminal S1, and is connected to the negative terminal of the coaxial shunt input terminal through the negative connection terminal S2;

[0068] The positive terminal of the coaxial shunt output end is connected to the positive terminal of the current sampling interface of the Rogowski coil type electric energy meter, and the negative terminal of the coaxial shunt output end is connected to the positive terminal of the current sampling interface in the Rogowski coil type electric energy meter;

[0069] The secondary coil induces a secondary current based on the alternating magnetic flux generated by the primary coil and inputs the secondary current into the coaxial shunt.

[0070] The electric energy meter verification device is also used to generate standard pulses according to the primary current and primary voltage generated by it, and calculate the difference between the number of standard pulses generated within a unit time window and the number of power pulses received to obtain an error value.

[0071] The present invention generates a universal and accurate voltage signal through a standard current transformer and a coaxial shunt, thereby simplifying the evaluation process; this method reduces manual intervention in the evaluation process, improves efficiency, reduces operational complexity, and also reduces errors caused by human errors.

[0072] Embodiment 2

[0073] In order to achieve accurate evaluation of a Rogowski coil type electric energy meter, the present invention proposes an evaluation method for a Rogowski coil type electric energy meter, wherein the Rogowski coil type electric energy meter measures electric energy by an external Rogowski coil, and comprises a current sampling interface, a voltage sampling interface and a power pulse output interface; and is applied to an evaluation device, the device comprising:

[0074] An electric energy meter calibration device comprising a current output port, a voltage output port, and a power pulse input interface; the voltage output port is electrically connected to a voltage sampling interface of a Rogowski coil type electric energy meter; the power pulse input interface is electrically connected to a power pulse output interface of a Rogowski coil type electric energy meter;

[0075] A standard current transformer is connected in series with the current output port of the electric energy meter verification device;

[0076] A coaxial shunt, whose input end is connected to the output of a standard current transformer, and whose output end is connected to the current sampling interface of a Rogowski coil type electric energy meter; the evaluation method comprises:

[0077] A primary current and a primary voltage are generated through the electric energy meter verification device, and the primary current is output to a standard current transformer through a current output port, and the primary voltage is output to a voltage sampling interface of a Rogowski coil type electric energy meter through a voltage output port;

[0078] The primary current is used to generate an alternating magnetic flux through a standard current transformer, and the secondary current is induced based on the alternating magnetic flux and input into a coaxial shunt;

[0079] The secondary current is converted into a voltage signal through a coaxial shunt and input into a Rogowski coil type energy meter;

[0080] It should be noted that the output voltage signal V of the coaxial shunt out It is proportional to the secondary current I2. The specific relationship is: V out =R×I2; where R is the resistance value of the coaxial shunt.

[0081] The Rogowski coil type electric energy meter uses the voltage signal input by the coaxial shunt and the voltage signal output by the voltage output port in the electric energy meter verification device to measure the electric energy, and outputs the power pulse to the electric energy meter verification device through the power pulse output interface;

[0082] The evaluation method also includes:

[0083] In the Rogowski coil type electric energy meter, the current conversion ratio corresponding to the original Rogowski coil is updated to the current conversion ratio of the corresponding standard current transformer.

[0084] The electric energy meter calibration device generates a standard pulse using the primary current and primary voltage generated by the electric energy meter, and calculates the difference between the number of standard pulses generated within a unit time window and the number of power pulses received to obtain an error value.

[0085] Specifically:

[0086] The transformation ratio K of a standard current transformer is defined as the ratio of the primary current I1 to the secondary current I2, that is:

[0087]

[0088] Rogowski coil type energy meter is based on the voltage signal V input by the coaxial shunt out The primary current I1 is calculated by reverse calculation with the known transformation ratio K:

[0089] I1=K×I2;

[0090] because therefore:

[0091] Energy metering:

[0092] The Rogowski coil watt-hour meter uses the inversely calculated primary current I1 and the primary voltage V provided by the watt-hour meter calibration device. line Calculate the instantaneous power P:

[0093] P=V line ×I1×cos(φ);

[0094] Where cos(φ) is the power factor.

[0095] The Rogowski coil energy meter calculates the energy E over a period of time by integrating the instantaneous power P:

[0096] E = ∫Pdt;

[0097] The Rogowski coil energy meter converts the accumulated electrical energy into power pulse output. Each pulse usually represents a fixed unit of electrical energy (for example, 1 watt-hour). Therefore, the number of power pulses N can be expressed as: In the formula, E unit It is the unit of electrical energy represented by each pulse.

[0098] The energy meter verification device generates standard pulses based on the primary current and primary voltage it generates. These standard pulses represent the theoretical amount of electrical energy that should be generated under given conditions.

[0099] The electric energy meter verification device calculates the number of standard pulses N generated within a unit time window std The actual number of power pulses received N meas The difference between the two is the error value ΔN:

[0100] ΔN=N std -N meas ;

[0101] The evaluation method also includes:

[0102] It is determined whether the error value ΔN is less than a preset value. If so, it indicates that the calculation accuracy of the Rogowski coil type electric energy meter is qualified.

[0103] In the present invention, the electric energy meter calibration device generates a standard pulse based on the generated primary current and primary voltage, and compares it with the actual power pulse output by the electric energy meter. This method provides a direct and reliable way to evaluate the accuracy of the electric energy meter; by calculating the difference between the number of standard pulses and the actual number of power pulses in a unit time window, the error value can be obtained, thereby intuitively reflecting the measurement accuracy of the electric energy meter.

[0104] Embodiment 3

[0105] like Figure 2 As shown, the present invention also proposes an evaluation device for a Rogowski coil type electric energy meter, wherein the Rogowski coil type electric energy meter measures electric energy by an external Rogowski coil, and comprises a current sampling interface, a voltage sampling interface and a power pulse output interface; and is used for simultaneously evaluating multiple Rogowski coil type electric energy meters, wherein the evaluation device comprises:

[0106] An electric energy meter calibration device comprising a current output port, a voltage output port, and a plurality of power pulse input interfaces, for generating a primary current and a primary voltage, and outputting them through the current output port and the voltage output port respectively; the voltage output port is electrically connected to the voltage sampling interface of each Rogowski coil type electric energy meter; the power pulse input interface is connected to the power pulse output interface of the Rogowski coil type electric energy meter in a one-to-one correspondence;

[0107] A standard current transformer corresponding to the Rogowski coil type electric energy meter is connected in series with the current output port of the electric energy meter verification device, and is used to generate an alternating magnetic flux through the primary current, and induce a secondary current based on the alternating magnetic flux;

[0108] A coaxial shunt corresponding to a Rogowski coil type electric energy meter, whose input end is connected to the output of the corresponding standard current transformer, and whose output end is connected to the current sampling interface of the corresponding Rogowski coil type electric energy meter, is used to convert the secondary current into a voltage signal and input it into the corresponding Rogowski coil type electric energy meter;

[0109] The Rogowski coil type electric energy meter is used to measure electric energy according to the voltage signal input by the corresponding coaxial shunt and the voltage signal output by the voltage output port in the electric energy meter verification device, and output power pulses to the electric energy meter verification device through the corresponding power pulse output interface;

[0110] The electric energy meter calibration device is also used to generate standard pulses based on the primary current and primary voltage generated by it, and for each Rogowski coil type electric energy meter, calculate the difference between the number of standard pulses generated within a unit time window and the number of power pulses received from the electric energy meter, so as to obtain the error value corresponding to each Rogowski coil type electric energy meter.

[0111] In this embodiment, the electric energy meter verification device includes multiple power pulse input interfaces, each of which is connected to a power pulse output interface of a Rogowski coil type electric energy meter in a one-to-one correspondence. This design allows the system to simultaneously receive power pulse signals from multiple electric energy meters. At the same time, each Rogowski coil type electric energy meter is equipped with a corresponding standard current transformer and coaxial shunt. These components ensure that each electric energy meter can independently receive accurate voltage signals for electric energy measurement;

[0112] In addition, the traditional calibration method usually requires calibrating each electric energy meter one by one, which is not only time-consuming but also inefficient. However, the present invention can evaluate multiple electric energy meters at the same time through multi-channel design, greatly improving the evaluation efficiency;

[0113] Furthermore, in this embodiment, the electric energy meter verification device generates standard pulses according to the generated primary current and primary voltage. These standard pulses are used as reference values ​​for comparison with the power pulses actually output by each electric energy meter. By calculating the difference between the number of standard pulses and the number of actual power pulses in a unit time window, the error value of each electric energy meter can be obtained. This method ensures that all electric energy meters are evaluated under the same conditions, ensuring the consistency and accuracy of the evaluation results.

[0114] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0115] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0116] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0117] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. An evaluation device for a Rogowski coil type electric energy meter, wherein the Rogowski coil type electric energy meter measures electric energy by an external Rogowski coil, and comprises a current sampling interface, a voltage sampling interface and a power pulse output interface; characterized in that: The evaluation equipment comprises: An electric energy meter calibration device comprising a current output port, a voltage output port, and a power pulse input interface, for generating a primary current and a primary voltage, and outputting them through the current output port and the voltage output port respectively; the voltage output port is electrically connected to a voltage sampling interface of a Rogowski coil type electric energy meter; the power pulse input interface is electrically connected to a power pulse output interface of the Rogowski coil type electric energy meter; A standard current transformer is connected in series with the current output port of the electric energy meter verification device, and is used to generate an alternating magnetic flux through a primary current and induce a secondary current based on the alternating magnetic flux; A coaxial shunt, whose input end is connected to the output of the standard current transformer, and whose output end is connected to the current sampling interface of the Rogowski coil type electric energy meter, is used to convert the secondary current into a voltage signal and input it into the Rogowski coil type electric energy meter; the Rogowski coil type electric energy meter is used to measure electric energy according to the voltage signal input by the coaxial shunt and the voltage signal output by the voltage output port in the electric energy meter verification device, and output power pulses to the electric energy meter verification device through the power pulse output interface; The electric energy meter verification device is also used to generate standard pulses according to the primary current and primary voltage generated by it, and calculate the difference between the number of standard pulses generated within a unit time window and the number of power pulses received to obtain an error value.

2. The evaluation device for a Rogowski coil type electric energy meter according to claim 1, characterized in that: The standard current transformer comprises: a primary side and a secondary side; wherein: The primary side is connected in series with the current output port of the electric energy meter verification device; the primary side is used to generate alternating magnetic flux through the primary current; and the secondary side generates secondary current through electromagnetic induction under the action of the alternating magnetic flux.

3. The evaluation device for a Rogowski coil type electric energy meter according to claim 2, characterized in that: The primary side includes: a primary coil; The current output port of the electric energy meter verification device outputs a primary current to the primary coil; the primary coil generates an alternating magnetic flux through the primary current.

4. The evaluation device for a Rogowski coil type electric energy meter according to claim 3, characterized in that: The input end and the output end of the coaxial shunt both include a positive terminal and a negative terminal.

5. The evaluation device for a Rogowski coil type electric energy meter according to claim 4, characterized in that: The secondary side includes: a secondary coil, and a positive connection terminal S1 arranged at the positive end of the secondary coil and a negative connection terminal S2 arranged at the negative end of the secondary coil; The secondary coil is connected to the positive terminal of the coaxial shunt input terminal through the positive connection terminal S1, and is connected to the negative terminal of the coaxial shunt input terminal through the negative connection terminal S2; The positive terminal of the coaxial shunt output end is connected to the positive terminal of the current sampling interface of the Rogowski coil type electric energy meter, and the negative terminal of the coaxial shunt output end is connected to the positive terminal of the current sampling interface in the Rogowski coil type electric energy meter; The secondary coil induces a secondary current based on the alternating magnetic flux generated by the primary coil and inputs the secondary current into the coaxial shunt.

6. An evaluation method for a Rogowski coil type electric energy meter, wherein the Rogowski coil type electric energy meter measures electric energy by an external Rogowski coil, and comprises a current sampling interface, a voltage sampling interface and a power pulse output interface; characterized in that: Applicable to evaluation equipment, the equipment includes: An electric energy meter calibration device comprising a current output port, a voltage output port, and a power pulse input interface; the voltage output port is electrically connected to a voltage sampling interface of a Rogowski coil type electric energy meter; the power pulse input interface is electrically connected to a power pulse output interface of a Rogowski coil type electric energy meter; A standard current transformer is connected in series with the current output port of the electric energy meter verification device; A coaxial shunt, whose input end is connected to the output of a standard current transformer, and whose output end is connected to the current sampling interface of a Rogowski coil type electric energy meter; the evaluation method comprises: A primary current and a primary voltage are generated through the electric energy meter verification device, and the primary current is output to a standard current transformer through a current output port, and the primary voltage is output to a voltage sampling interface of a Rogowski coil type electric energy meter through a voltage output port; The primary current is used to generate an alternating magnetic flux through a standard current transformer, and the secondary current is induced based on the alternating magnetic flux and input into a coaxial shunt; The secondary current is converted into a voltage signal through a coaxial shunt and input into a Rogowski coil type energy meter; The Rogowski coil type electric energy meter uses the voltage signal input by the coaxial shunt and the voltage signal output by the voltage output port in the electric energy meter verification device to measure the electric energy, and outputs the power pulse to the electric energy meter verification device through the power pulse output interface; The electric energy meter calibration device generates a standard pulse using the primary current and primary voltage generated by the electric energy meter, and calculates the difference between the number of standard pulses generated within a unit time window and the number of power pulses received to obtain an error value.

7. The evaluation method for a Rogowski coil type electric energy meter according to claim 6, characterized in that: The evaluation method also includes: In the Rogowski coil type electric energy meter, the current conversion ratio corresponding to the original Rogowski coil is updated to the current conversion ratio of the corresponding standard current transformer.

8. An evaluation device for a Rogowski coil type electric energy meter, wherein the Rogowski coil type electric energy meter measures electric energy by an external Rogowski coil, and comprises a current sampling interface, a voltage sampling interface and a power pulse output interface; characterized in that: Used to evaluate multiple Rogowski coil type electric energy meters simultaneously, the evaluation device comprises: An electric energy meter calibration device comprising a current output port, a voltage output port, and a plurality of power pulse input interfaces, for generating a primary current and a primary voltage, and outputting them through the current output port and the voltage output port respectively; the voltage output port is electrically connected to the voltage sampling interface of each Rogowski coil type electric energy meter; the power pulse input interface is connected to the power pulse output interface of the Rogowski coil type electric energy meter in a one-to-one correspondence; A standard current transformer corresponding to the Rogowski coil type electric energy meter is connected in series with the current output port of the electric energy meter verification device, and is used to generate an alternating magnetic flux through the primary current, and induce a secondary current based on the alternating magnetic flux; A coaxial shunt corresponding to a Rogowski coil type electric energy meter, whose input end is connected to the output of the corresponding standard current transformer, and whose output end is connected to the current sampling interface of the corresponding Rogowski coil type electric energy meter, is used to convert the secondary current into a voltage signal and input it into the corresponding Rogowski coil type electric energy meter; The Rogowski coil type electric energy meter is used to measure electric energy according to the voltage signal input by the corresponding coaxial shunt and the voltage signal output by the voltage output port in the electric energy meter verification device, and output power pulses to the electric energy meter verification device through the corresponding power pulse output interface; The electric energy meter calibration device is also used to generate standard pulses based on the primary current and primary voltage generated by it, and for each Rogowski coil type electric energy meter, calculate the difference between the number of standard pulses generated within a unit time window and the number of power pulses received from the electric energy meter, so as to obtain the error value corresponding to each Rogowski coil type electric energy meter.

Images