GB2504899A - Field integral detecting system of three-phase electric energy measuring system of electric distribution network - Google Patents

Field integral detecting system of three-phase electric energy measuring system of electric distribution network Download PDF

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Publication number
GB2504899A
GB2504899A GB201320625A GB201320625A GB2504899A GB 2504899 A GB2504899 A GB 2504899A GB 201320625 A GB201320625 A GB 201320625A GB 201320625 A GB201320625 A GB 201320625A GB 2504899 A GB2504899 A GB 2504899A
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phase
electric energy
energy meter
power supply
voltage
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GB201320625A
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GB201320625D0 (en
GB2504899B (en
Inventor
Bo Jiang
Huayun Yang
Wei Jiang
Yingxia Jiang
Na He
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SICHUAN ELEC POWER RES INST
State Grid Corp of China SGCC
Sichuan Electric Power Research Institute
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SICHUAN ELEC POWER RES INST
State Grid Corp of China SGCC
Sichuan Electric Power Research Institute
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Priority to CN201110102006A priority Critical patent/CN102156274B/en
Application filed by SICHUAN ELEC POWER RES INST, State Grid Corp of China SGCC, Sichuan Electric Power Research Institute filed Critical SICHUAN ELEC POWER RES INST
Priority to PCT/CN2011/001894 priority patent/WO2012142736A1/en
Publication of GB201320625D0 publication Critical patent/GB201320625D0/en
Publication of GB2504899A publication Critical patent/GB2504899A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00Testing or calibrating of apparatus covered by the preceding groups
    • G01R35/04Testing or calibrating of apparatus covered by the preceding groups of instruments for measuring time integral of power or current

Abstract

A field integral detecting system of a three-phase electric energy measuring system of an electric distribution network mainly consists of a portable adjustable three-phase voltage, an electric energy meter verifier, a three-phase active electric energy meter field measuring circuit and a three-phase active electric energy meter standard measuring circuit. According to a V-V connection method or a Y-Y connection method, a primary loop of a high-voltage current transformer of the field measuring circuit is connected with a standard high-voltage current transformer in series, and a standard voltage transformer is connected with a voltage transformer loop of the field measuring circuit in parallel. With the system, the comprehensive error is minimized, and the accuracy of the measuring device is improved through the integral test. The system directly, truly and accurately measures the overall operating performance of the electric energy measuring system of a three-phase power supply system of an electric distribution network.

Description

Field Integral Detecting System of Three-phase Electric Energy Measuring System of Electric Distribution Network

Technical Field

The present invention relates to a detecting and verifying device of electric energy meter. lii particular, it relates to a detecting system of the operation performance of a three-phase electric energy measuring device of electric energy distribution network, especially suitable for an integral verification (detection) of an electric energy measuring device formed by high voltage three-phase combined transformer.

Background Art

In the 3 kV -35 kY electric energy distribution network, both the electric energy measurement of the three-phase electric power supply system and the setting of the measuring device basically adopt the three-phase three-wire (V-V) connection method, which has been widely applied in the city electricity grid and the countryside electricity grid. That is to say, the electric energy measurement of such system is performed via the three-phase three-wire (V-V connection) measuring method. Therefore, in regard to the measurement detection or verification, it should also be performed with the same method in order to be in accordance with the actual operation condition. Only in this way, the accuracy and fairness of the verification (detection) can be reflected to the maximal degree, and thus receive agreements from all users. And meanwhile, it is also the technical means and measures of the electric power industry to conduct quality service and make contribution to the harmony of our society. However, the verification (detection) method utilized in the current domestic electric energy measurement device for three-phase power supply system is not an integral verification with three-phase three-wire measuring method performed according to the above mentioned method.

In Figure i, the part on the left side of the dotted line is a block diagram of the mechanism of the electric energy measurement adopted by the field three-phase electric power supply system. The detection of the measurement device has currently been conducted, as shown in Figure 1, as the individually conducted verifications (detections) of each measurement element, and then calculates out the error performance of the overall measurement system. This kind of detecting method is not capable of mimicking the field actual operation condition and environment to conduct performance detection.

Especially, the verification to the three-phase voltage transfiwmer (TV) and the three-phase current transformer (TA) in the three-phase combined transformer is still conducted with the single phase method, which is not able to detect the interaction of the electric field and magnetic field between the three-phase voltage transformer (TV) and the three-phase current transformer (TA) in the three-phase combined transformer, as well as the actual operation performance under the transformer's actual loading.

Similarly, the performance of electric energy meter is also individually detected.

The electricity consumption, which is the reflection of the electric energy measurement of the three-phase electric power supply system in trade settlement, is represented and measured by the electric energy meter that is the last link of the system.

Albeit it has been regulated in the related national standard about the accuracy levels of each devices in the measurement system, their errors can actually he either a positive or a negative deviation at a certain accuracy level. For a simple example, in a case when the error of TV is ± 0.1 %, the error of TA is ± 0.1 %, and the error of the electric energy meter is also ± 0.1 %, although in this case the error of the electric energy meter is not greater than 0.2 %, theoretically the actual error of the system is already ± 0.3 %, which exceeds the actual electric energy meter detection error, and exceeds the nominal 0.2 class as being labeled on the tag of electric energy meter. Accordingly, during the periodical detection or measurement arbitration of the measurement system, describing accuracy of the entire measurement system only based on the error of its electric energy meter is not convincing. In addition, the method and conclusion from such kind of detection are not in accordance with the actual operation condition of that measurement system.

Therefore, with today's society development and technology progress, the present relative regulation and method of measurement and detection should keep pace with the

I

times, so as to adapt to and satisfy the needs of people in our society. It is the starring and focusing points of the present patent application of how to accurately conduct measurement detection to the three-phase electric energy measurement device of high voltage electric energy distribution network, so as to ensure the economic interests of both the supply and demand sides of the electricity power in a fair and just manner.

Summary of Invention

One objective of the present invention is to provide a field integral detecting system of a three-phase electric energy measuring system of an electric distribution network with small overall error and accurate and convenient measurement and detection.

The objective of the present invention has been achieved as: a field integral detecting system of a three-phase electric energy measuring system of an electric distribution network, comprising an electric energy meter verifier, a portable adjustable three-phase power supply: voltage beillg 3 kV -35 kY, current being 0 -600 A; further comprising: a three-phase voltage transformer (TV): one end of each primary winding of its three primary windings being connected to one phase line of said three-phase power supply, the other end of the three primary windings being connected to each other; one end of each secondary winding of the three secondary windings being connected to one end of the voltage coil of a single phase electric energy meter in a three-phase four-wire active electric energy meter, the other end of the voltage coil of each single phase electric energy meter being all connected to a null line of the three-phase power supply, and the other end of said three secondary windings all being connected to the null line of said three-phase power supply; a three-phase current transformer (TA): each coil of its three coils being set (laterally circling) on a phase line of the three-phase power supply, and each coil of said three coils being connected in series with a current coil of a single phase electric energy tneter in the three-phase four-wire active electric energy meter; a standard three-phase voltage transfiwmer (STV): one end of each primary winding of its three primary windings being connected to one phase line of said three-phase power supply, the other end of said three primary windings being connected to each other; one end of each secondary winding of its three secondary windings being connected to one end of the voltage coil of a single phase electric energy meter in a three-phase four-wire active electric energy meter, the other end of the voltage coil of each single phase eclectic energy meter being all connected to the null line of the three-phase power supply, and the other end of said three secondary windings all being connected to the null line of the three-phase power supply: a standard three-phase current transformer (STA): each coil of its three coils being set on a phase line of the three-phase power supply, and each coil of said three coils being connected in series with a current coil of a single phase electric energy meter in the three-phase four-wire active electric energy meter; the signal output end of said three-phase four-wire active electric energy meter and the signal output end of a standard three-phase four-wire active electric energy meter being respectively connected to the signal input end of said electric energy meter verifier.

The accuracy of said standard three-phase voltage transformer (STV) is higher than the accuracy of the three-phase voltage transformer (TV) by 2 -3 classes; the accuracy of said standard three-phase current transformer (STA) is higher than the accuracy of the three-phase current transformer (TA) by 2 -3 classes: the accuracy of said standard three-phase four-wire active electric energy meter is higher than the accuracy of the three-phase four-wire active electric energy meter by 2 -3 classes.

The present invention has established a set of field integral operation performance detecting method of a three-phase power supply system electric energy measuring device of an electric distribution network. More specifically, it has established a set of electric energy measurement system standards whose structLlre is completely consistent to that of the field electric energy measurement system. Driven by the same set of high voltage three-phase voltage source and current source, the electric energy amounts accumulated by the two systems under the same operation condition are compared at the same time, so as to obtain the overall operation performance of the three-phase power supply system electric energy measuring device of an electric distribution network. In this way, it is capable of mimicking the field actual operation status of the three-phase power supply system electric energy measuring device of an electric distribution network; and at the same status, implementing integral detection of operation performance. Therefore, the present invention is the most faithful verification (detection) to said measurement system.

This method utilizes a connection method that is consistent with the actual operation system. It has overcome the deficiency that, during the measurement detection and verification, the errors of separate parts are added together rather than reflected on the final measurement electric energy meter, such that it is capable of obtaining the actual error value under the conditions of various load currents. And based on this, it can be further performed of targeted grouping and matching for different measurement components in the system, so as to minimize the overall error, which is exactly the achievement of the accuracy and fairness of the measurement.

The beneficial effects of the present invention are: 1. It has established a set of electric energy measurement system standards of three-phase power supply system, whose composition structure is completely consistent with that of the electric energy measurement device of three-phase power supply system of an electric distribution network; and its accuracy is higher by 2 to 3 classes of the overall accuracy of the field operative electric energy measurement device of three-phase pow& supply system of the electric distribution network.

2. Tt has established a high voltage current transformer standard. With the adoption of a fully insulated structure, it is capable of withstanding a voltage level of 3 kV. Tn addition, the influence of the high voltage leakage current on the error of the current transformer is not larger than 1/10 of the standard error limit of the current transformer.

3. During a power failure, a poahle three-phase power supply can he used in the condition that does not need an external alternating current test power supply, to generate high voltage three-phase cunent and three-phase voltage, and is connected to the electric energy measurement system standard of the three-phase power supply system of an electric energy distribution network (formed by a standard three-phase vohage transformer (STV), a standard three-phase current transformer (STA), and a standard electric energy meter) and the fieki electric energy measurement system of three-phase power supply of the electric energy distribution network. In this way, it makes both the above two measurement systems operate under the condition that mimics the actual operation condition. With the same high voltage excitation source, the amount of electricity accumulated by the two measurement systems and other parameters are input to the electric energy meter verifier at the same time to implement the verification (detection), thereby obtaining the true overall operation p rmance of the field electric energy measurement system of three-phase power supply system of the electric energy distribution network.

4. Due to the fact that the standard system and the actual system are compared synchronously, and that both are supplied by the same portable three-phase power supply that can be used during power failure, which can convenielltly simulate the current loads of 1 % to 120 % of the rated current, it is thus capable of accurately detecting the actual operation performance of the electric energy measurement system of the three-phase power supply system of electric energy distribution network at different operation status.

5. This method not only is capable of performing integral verification (detection) to the field electric energy measurement device of three-phase power supply system of an electric energy distribution network, hut also is capable of performing individual detection to the three-phase combined transformer and electric energy meter, as well as performing grouping and matching based on the single error of respective individual devices. In this way, it can achieve the obiective of minimizing the overall error of the electric energy measurement system of three-phase power supply system of an electric energy distribution network.

6. Due to the fact that it directly detects the overall operation performance of an electric energy measurement system of a three-phase power supply system of an electric energy distribution network, it is able to find steeling of the electric power in the electric energy measurement system in a timely manner. And at the same time, any non-conforming connection method in the primary loop and secondary loop of the measurement system can be easily and immediately observed through such field detection.

Description of Drawings

Figure 1 is a block diagram of the mechanism of the present invention.

Figure 2 is a view of the integral verification connection method (V-V type connection method) of the present invention.

Figure 3 is a view of the integral verification connection method (Y-Y type connection method) of the present invention.

Description of Embodiments

In Figure I: U, is the high voltage output from a three-phase power supply; I, is the current output from the three-phase power supply: TV, is voltage transformer; TA, is current transformer. On the left side of the dotted line, it is the field electric energy measurement device, and on the right side of the dotted line, it is the standard electric energy measurement device whose structure is consistent with that of the field electric energy measurement device.

In Figure 2: TV, is voltage transformer; TA, is current transformer; STY, is standard voltage transformer; STA, is standard current transformer.

Power supply: three-phase high voltage power supply (according to the parameters of field devices, the voltage can he 3 kV 35 kV; the current source part can output 0 600 A).

Three-phase three-wire active electric energy meter (i.e., the watt-hour meter): the electric energy meter used for trade settlement on field.

This connection view is a three-phase three-wire measurement method, V -V type connection method. In Figure 2, in the top left side, it is a three-phase three-wire active electric energy meter, on the top right side, it is a standard electric energy meter.

And it is the same arrangement in Figure 3.

In Figure 3, TV, is voltage transformer; TA, is current transformer: STV, is standard voltage transformer: STA, is standard current transformer.

Power supply: three-phase high voltage power supply (according to the parameters of field devices, the voltage can be 3 kV -35 kV; the current source part can output 0 -600 A).

Three-phase four-wire active electric energy meter: the electric energy meter

used for trade settlement on field.

This connection view is a three-phase four-wire measurement method, Y-Y type connection method. In the figure, on the top left side, it is the field electric energy measurement device, on the top right side, it is the standard electric energy measurement device whose structure is consistent to that of the field electric energy measurement device.

In reference to the accompanying drawings, the present invention will he further described.

In reference to Figure 3, the present new model type comprises an electric energy meter verifier, a portable adjustable three-phase power supply: voltage being 3 kV -35 kV, cLirrent being 0 -600 A; also comprising, a three-phase voltage transformer (TV): one end of each primary winding of its three primary windings being connected to one phase line of said three-phase power supply, the other end of said three primary windings being connected to each other; one end of each secondary winding of its three secondary windings being connected to one end of the voltage coil of a single phase electric energy meter in a three-phase four-wire active electric energy meter, the other end of the voltage coil of each single phase electric energy meter being all connected to the null line of the three-phase power supply, and the other end of said three secondary windings all being connected to the null line of said three-phase power supply; a three-phase current transformer (TA): each coil of its three coils being set (laterally circling) on a phase line of the three-phase power supply, and each coil of said three coils being connected in series with a current coil of a single phase electric energy meter in the three-phase four-wire active electric energy meter; a standard three-phase voltage transformer (STy): one end of each primary winding of its three primary windings being connected to one phase line of said three-phase power supply, the other end of its three primary windings being connected to each other: one end of each secondary winding of its three secondary windings being connected to one end of the voltage coil of a single phase electric energy meter in a three-phase four-wire active electric energy meter, the other end of the voltage coil of each single phase electric energy meter being all connected to the null line of the three-phase power supply, and the other end of said three secondary windings all being connected to the null line of said three-phase power supply: a standard three-phase current transformer (STA): each coil of its three coils being set on a phase line of the three-phase power supply, and each coil of said three coils being connected in series with a current coil of a single phase electric energy meter in the three-phase four-wire active electric energy meter; the signal output end of said three-phase four-wire active electric energy meter and the signal output end of a standard three-phase four-wire active electric energy meter being respectively connected to the signal input end of said electric energy meter verifier.

In reference of Figure 2 and Figure 3, when there is a power failure in the electric energy distribution network, the portable three-phase power supply can be connected in.

A primary loop of a high-voltage current transformer of the field measuring system is connected with a standard high-voltage current transformer in series, and the connection is made according to the actual three-phase connection method (V-V connection method or Y-Y connection method); the standard voltage transformer is connected with a voltage transformer loop of the field measuring system in parallel, and similarly, the connection is made according to the actual three-phase connection method (V-V connection method or Y-Y connection method); in this way, the standard transformer used for verification (detection) is connected fully according to the three-phase connection method of the system operation, so as to form a standard electric energy measurement system of the three-phase power supply system of an electric energy distribution network, which is consistent with the field electric energy measurement system of the three-phase power supply system of electric energy distribution network. Via adjusting the portable three-phase power supply that can be used during a power failure, input the rated current and rated voltage according to the need of the verification (detection) work, the secondary current and voltage outputted from the transformer enters the respective loaded electric energy meter, thus the signals from the field installed electric energy meter and the standard electric energy meter are inputted into the electric energy meter verifier for verification (detection). Due to the fact that the accuracy level of the present standard device (comprising standard electric energy meter, standard voltage transformer and standard current transformer) is 2 to 3 classes higher than that of the field operated electric energy measurement device, thus, the error of the standard electric energy measurement system is negligible. The error value of the two systems obtained via the electric energy meter verifier is thus the overall error of the field measurement system.

The two key devices of the present invention, the first one is the portable three-phase power supply that can be used during a power failure. It can generate 0 -600 A alternating current, and its voltage source is able to generate 3 kV -35 kV high voltage, which is suitable for a verification (detection) under the condition that there is a power failure on field. In addition, such a power supply need to be of light weight and easy to move and install. The second set of device is the three-phase standard current transformer and standard voltage transformer, which need to be developed to make sure that they are consistent to that field equipments; as well as that both the above transformers need to be able to operate under a high voltage. Its typical three-phase three-wire (V-V) connection method has been set forth in Figure 2. It has been shown in Figure 2 that the integral verification has combined the errors of each measurement element in the measurement device, as well as the error of TV secondary voltage drop, and the error derived from the influence of interaction between the electric field and the magnetic field of the internal neighboring elements of the three-phase combined transformer, and etc. The errors generated from the actual measurement device are reflected in the comparison of the electric energy meters. in regard to the verification and detection of the measurement error, this method is more direct, more real and more rational. Such an integral verification has more practical significance.

What is shown in Figure 2 is a three-phase three-wire (V-V) connection method.

Similarly, in regard to the three-phase four-wire (Y-Y) connection method shown in Figure 3, it can also implement integral verification (detection). In order to maximize the detection accuracy of the measurement device, on the basis of the above mentioned integral verification method, it can further implement individual verification to each element. Within the required accuracy range of each device, implement rational matching, in order to minimize the comprehensive error, thereby to increase the measurement device accuracy through the result of the integral verification, which is necessary for the electric energy measurement used for trade settlements.

In addition, in regard to the verification (detection) of the field measurement device, in addition to targeting the various measurement elements with the measurement device, the primary and secondary wire connection method in the entire system, quality of the installation, long term maintenance level and other factors all have their influences to the accuracy of measurement. The part separating detection method that has been used up to date is not able to find such problems. The integral detecting method overcomes these deficiencies; and is capable of discovering such problems, and thus gets a more accurate error measurement result. In particular, in the case when there is an electric power steeling in the measurement primary and secondary loops, it can timely discover it.

With reference to Figure 2 and Figure 3, the present invention, i.e., the field integral operation performance detecting method by the electric energy measurement device of three-phase power supply system of an electric distribution network, is formed by three components, a field measurement device, a standard measurement device and a portable three -phase power supply. The same set of current source and voltage source has been used as the test power supply. The TV of the tested device and the TV of the standard device are connected in parallel, while the TA of the tested device and the TA of the standard device are connected in series. The two sets of devices synchronously receive the current and voltage provide by the portable three-phase power supply. In regard to the tested device, its secondary loop as well as its connection method have not been made any change, and have been maintained to be consistent to the actual operation.

In regard to the standard device and its individual measurement elements, they are regulated by the requirements; the accuracy level of the standard voltage transformer, the standard current transformer and the standard electric energy meter are all higher than that of their corresponding equipments in the tested device by 2 to 3 classes. Under the condition that the adjustable power supply provides current and rated voltage to any testing site, the information from the tested electric energy meter is sent to the standard electric energy meter verifier for verification (detection). Due to the fact that the accuracy 1eve of the standard device being 2 to 3 c'asses higher, its own error is negligible, thus the data obtained from the verifier is just the overall error of the tested device.

Claims (2)

  1. Claims -A field integral detecting system of a three-phase electric energy measuring system of an electric distribution network, comprising, an electric energy meter verifier, a portable adjustable three-phase power supply: voltage being 3 kV -35 kV, current being 0 -600 A; characterized by: further comprising, a three-phase voltage transformer (TV): one end of each primary winding of its three primary windings being connected to one phase line of a three-phase power supply, the other end of the three primary windings being connected to each other; one end of each secondary winding of the three secondary windings being connected to one end of a voltage coil of a single phase electric energy meter in a three-phase four-wire active electric energy meter, the other end of the voltage coil of each single phase electric energy meter being all connected to a null line of the three-phase power supply, and the other end of said three secondary windings all being connected to the nLIll line of the three-phase power supply; a three-phase current Lransforiner (TA): each coil of iLs three coils being set on a phase line of the three-phase power supply, and each coil of said three coils being connected in series with a current coil of a single phase electric energy meter in the three-phase four-wire active electric energy meter; a standard three-phase voltage transformer (STY): one end of each primary winding of its three primary windings being connected to one phase line of the three-phase power supply, the other end of the three primary windings being connected to each other; one end of each secondary winding of its three secondary windings being connected to one end of a voltage coil of a single phase electric energy meter in a three-phase four-wire active electric energy meter, the other end of the voltage coil of each single phase electric meter being all connected to the null line of the three-phase power supply, and the other end of said three secondary windings all being connected to the null line of the three-phase power supply: a standard three-phase current transformer (STA): each coil of its three coils being set on a phase line of the three-phase power supply, and each coil of said three coils being connected in series with a current coil of a single phase electric energy meter in tile three-phase tour-wire active electric energy meter: and a signal oLItpLlt end of said three-phase four-wire active electric energy meter and a signal output end of a standard three-phase four-wire active electric energy meter being respectively connected to a signal input end of said electric energy meter verifier.
  2. 2. A field integral detecting system of a three-phase electric energy measuring system of an electric distribution network as claimed in claim 1, characterized by: the accuracy level of said standard three-phase voltage transformer (STY) is higher than the accuracy level of said three-phase voltage transformer (TV) by 2 -3 classes; the accuracy level of said standard three-phase current transformer (STA) is higher than the accuracy level of said three-phase current transformer (TA) by 2 -3 classes; the accuracy level of said standard three-phase four-wire active electric energy meter is higher than the accuracy level of said three-phase tour-wire active electric energy meter by 2 3 classes.
GB1320625.5A 2011-04-22 2011-11-11 Field integral detecting system of three-phase electric energy measuring system of electric distribution network Active GB2504899B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201110102006A CN102156274B (en) 2011-04-22 2011-04-22 Field integral detecting system of three-phase electric energy measuring system of electric distribution network
PCT/CN2011/001894 WO2012142736A1 (en) 2011-04-22 2011-11-11 Field integral detecting system of three-phase electric energy measuring system of electric distribution network

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CN104991152A (en) * 2015-06-24 2015-10-21 国家电网公司 Method and device for analyzing wrong wiring of three-phase three-wire electric energy metering device
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