GB2556308A - Improved distribution transformer energy efficiency measurement testing method, device and storage medium - Google Patents

Improved distribution transformer energy efficiency measurement testing method, device and storage medium Download PDF

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Publication number
GB2556308A
GB2556308A GB1804041.0A GB201804041A GB2556308A GB 2556308 A GB2556308 A GB 2556308A GB 201804041 A GB201804041 A GB 201804041A GB 2556308 A GB2556308 A GB 2556308A
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United Kingdom
Prior art keywords
distribution transformer
voltage
current
transformer
energy efficiency
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GB1804041.0A
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GB201804041D0 (en
GB2556308B (en
Inventor
Xiong Bo
Lei Min
Zhou Feng
Yin Xiaodong
Jiang Chunyang
Xiong Kui
Yuan Jianping
Chen Song
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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Publication of GB201804041D0 publication Critical patent/GB201804041D0/en
Publication of GB2556308A publication Critical patent/GB2556308A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/62—Testing of transformers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

An improved distribution transformer energy efficiency measurement testing method, device and storage medium, the testing method comprising: building an equivalent two-port network model of a distribution transformer (301); on the basis of the equivalent two-port network model, determining a distribution transformer energy efficiency calculation model (302); on the basis of the energy efficiency calculation model, building a distribution transformer energy efficiency testing device for a distribution transformer under actual operating conditions, thereby measuring an energy efficiency value of the distribution transformer under actual operating conditions (303). The testing method can accurately measure an energy efficiency value of a distribution transformer under actual operating conditions, using the same as an important reference basis for energy-saving data, and can be applied in the accurate analysis, calculation and energy efficiency level determination of an energy efficiency measurement of a distribution transformer

Description

71) Applicant(s):
China Electric Power Research Institute Company Limited
No. 15 Xiaoying East Road, Qinghe,
Haidian District 100031, Beijing, China, China
State Grid Corporation of China
No.86 West Chang'an Street, Beijing 100031, China (continued on next page) (51) INT CL:
G01R 31/02 (2006.01) G01R 31/00 (2006.01) (56) Documents Cited:
WO 2014/035325 A1 CN 104569664 A CN 104502691 A CN 104076226 A CN 102914706 A US 7106078 B1 (58) Field of Search: INT CL G01R
G01R 21/06 (2006.01)
CN 105182126 A CN 104515919 A CN 104407209 A CN 103926491 A CN 102393494 A US 20050212506 A1 (54) Title of the Invention: Improved distribution transformer energy efficiency measurement testing method, device and storage medium
Abstract Title: Improved distribution transformer energy efficiency measurement testing method, device and storage medium (57) An improved distribution transformer energy efficiency measurement testing method, device and storage medium, the testing method comprising: building an equivalent two-port network model of a distribution transformer (301); on the basis of the equivalent two-port network model, determining a distribution transformer energy efficiency calculation model (302); on the basis of the energy efficiency calculation model, building a distribution transformer energy efficiency testing device for a distribution transformer under actual operating conditions, thereby measuring an energy efficiency value of the distribution transformer under actual operating conditions (303). The testing method can accurately measure an energy efficiency value of a distribution transformer under actual operating conditions, using the same as an important reference basis for energy-saving data, and can be applied in the accurate analysis, calculation and energy efficiency level determination of an energy efficiency measurement of a distribution transformer
AA DIFFERENTIAL VOLTAGE BB DIFFERENTIAL CURRENT
CC POWER TESTER DD UPPER LEVEL COMPUTER
GB 2556308 A continuation (72) Inventor(s):
Bo Xiong Min Lei Feng Zhou Xiaodong Yin Chunyang Jiang Kui Xiong Jianping Yuan Song Chen (74) Agent and/or Address for Service:
Mathys & Squire LLP
The Shard, 32 London Bridge Street, LONDON, SE1 9SG, United Kingdom
Vl/kl-V2
Differential voltage
YynO
Γ7ξ
Power tester
FIG 2 ί /2
Upper computer
301
FIG.3
2/2
FIG 4
IMPROVED DISTRIBUTION TRANSFORMER ENERGY EFFICIENCY MEASUREMENT TESTINCi METHOD, DEVICE AND STORAGE MEDIUM
TECHNICAL FIELD
The invention relates to the field of transformer detection, and particularly to a method and device for measuring and detecting energy efficiency of an improved distribution transformer and a storage medium.
BACKGROUND
Loss of a distribution transformer in a power grid occupies a large part ofloss in the whole power grid. In a long-time operation process of the distribution transformer, there are many factors influencing its efficiency, for example, a load size and a harmonic content. For a transformer tested to be qualified, efficiency measurement is not performed on it in its operation process. However, a load capability of a transformer which operates for a long time is reduced under influence of various factors, and thus loss is increased, which causes a huge waste of electric energy.
Since loss of a distribution transformer is influenced by a load size and type, and is not a fixed value, a method forjudging a high-loss distribution transformer at home and abroad is usually to measure through a no-load test and a short-circuit test and further compare magnitudes of copper loss and iron loss with a distribution transformer standard all the time. Such a manner of estimating static energy efficiency of a transformer makes tests only when the transformer is delivered from a factory, and does not perform any energy efficiency test in a subsequent operation process.
Therefore, it is necessary to provide a method for detecting an energy efficiency measurement of a transformer under a practical working condition to provide a technical support for loss reduction and energy saving of the practically operating transformer and energy efficiency level determination of the transformer.
SUMMARY
In order to solve the technical problems, the embodiments of the invention provide a method and device for measuring and detecting energy efficiency of an improved distribution transformer and a storage medium.
An embodiment of the invention provides a method for measuring and detecting energy efficiency of an improved distribution transformer, which includes that:
an equivalent two-port, network model of the distribution transformer is constructed;
an energy efficiency calculation model for the distribution transformer is determined according to the equivalent two-port network model; and an energy efficiency detection device for the distribution transformer under a practical working condition is constructed according to the energy efficiency calculation model, thereby measuring an energy efficiency value of the distribution transformer under the practical working condition.
In the embodiment of the invention, the equivalent two-port network model includes a distribution transformer, a virtual current source and a virtual voltage source, the virtual current source is connected in parallel with two ends of an output end of the distribution transformer; and the virtual voltage source is connected in series with the output end.
Γ *
In the embodiment of the invention, a calculation formula for a current of the virtual current source is:
' · = Λ A: - 4, r T where 'f is an input-end current of the distribution transformer, 2 js an output-end current of the distribution transformer, is a proportional constant, and r / tz 2 is an output current of the equivalent two-port network model; and a calculation formula for a voltage f of the virtual voltage source is:
= i'/A\ - K.
[/, . ....
where 1 is a voltage between two input ends in the distribution transformer,
V K 2 is a voltage between two output ends in the distribution transformer, is a
1/ j If proportional constant, and '< 1 is an output voltage of the equivalent two-port network model.
In the embodiment of the invention, the energy efficiency calculation model
P includes the energy efficiency value 1 and loss value of the distribution transformer; and a calculation formula for the energy efficiency value is:
a calculation formula for the loss value L0SS is:
where 1 is input power of the equivalent two-port network model, and ‘'2 is output power of the equivalent twO-port network model, and
P’ is power provided by the virtual current source in the equivalent two-port network model, and ? V1A2 P x f/2; and
P ' is power provided by the virtual voltage source in the equivalent two-port in the embodiment of the invention, the energy efficiency detection device includes a current detection unit, a voltage detection unit, a power tester and an upper computer;
the current detection unit is configured to acquire all current signals of the distribution transformer under the practical working condition and send the voltage signals to the power tester;
the voltage detection unit is configured to acquire all voltage signals of the distribution transformer under the practical working condition and send the voltage signals to the power tester;
P the power tester calculates the energy efficiency value '· and loss value L0SS of the distribution transformer according to the voltage signals and the current signals; and the upper computer is configured to record, display and store the energy efficiency value and output a test report of measuring and detecting the energy efficiency ofthe distribution transformer.
In the embodiment ofthe invention, the current detection unit includes a first current transformer and a second current transformer; the first current transformer is configured to measure the output current ofthe equivalent two-port network model of the distribution transformer under the practical working condition; the second current transformer is configured to measure an input current of the equivalent two-port network model of the distribution transformer under the practical working condition, a primary winding of the first current transformer is connected in series with a primary winding ofthe distribution transformer, and a secondary' winding of the first current transformer is connected in series with a high-voltage end of a secondarywinding ofthe distribution transformer;
a primary' winding of the second current transformer is connected in series between a connection point ofthe primary' winding of the first current transformer and the high-voltage end and the high-voltage end; and a secondary winding of the second current transformer is connected with the power tester.
In the embodiment of the invention, the voltage detection unit includes a first voltage transformer and a second voltage transformer; the first voltage transformer is configured to measure an input voltage of the equivalent two-port network model of the distribution transformer under the practical working condition; the second voltage transformer is configured to measure an output voltage of the distribution transformer under the practical working condition;
a primary winding of the first voltage transformer is connected with the input end of the distribution transformer, a low-voltage end of a secondary' winding is shortcircuited with a low-voltage end of the secondary winding of the distribution transformer, and a high-voltage end of the secondary winding is connected with the high-voltage end of the secondary winding of the distribution transformer and the power tester respectively; and a primary winding of the second voltage transformer is connected with the output end of the distribution transformer, and a low-voltage end of a secondary winding is connected with the power tester.
in the embodiment of the invention, a transformation ratio of the first current transformer is A'-,:!;
a transformation ratio of the second current transformer is 1:1, and a current of its secondary winding is set to be a current value of the virtual current source in the equivalent two-port network model;
a transformation ratio of the first voltage transformer is :1, and a voltage between the high-voltage end of its secondary winding and the high-voltage end of the secondary' winding of the distribution transformer is set to be a voltage value of the virtual voltage source in the equivalent two-port network model; and a transformation ratio of the second voltage transformer is 1:1,
K wherein 1 and 2 are both proportional constants.
An embodiment of the invention provides a device for measuring and detecting energy efficiency of an improved distribution transformer, which includes:
a first construction unit, configured to construct an equivalent two-port network model of the distribution transformer;
a determination unit, configured to determine an energy efficiency calculation model for the distribution transformer according to the equivalent two-port network model, a second construction unit, configured to construct an energy efficiency detection device for the distribution transformer under a practical working condition according to the energy efficiency calculation model; and a measurement unit, configured to measure an energy efficiency value of the distribution transformer under the practical working condition.
In the embodiment of the invention, the equivalent two-port network model includes a distribution transformer, a virtual current source and a virtual voltage source;
the virtual current source is connected in parallel with two ends of an output end of the distribution transformer; and the virtual voltage source is connected in series with the output end.
In the embodiment of the invention, the energy efficiency detection device includes a current detection unit, a voltage detection unit, a power tester and an upper computer, the current detection unit is configured to acquire all current signals of the distribution transformer under the practical working condition and send the voltage signals to the power tester, the voltage detection unit is configured to acquire all voltage signals of the distribution transformer under the practical working condition and send the voltage signals to the power tester;
the power tester is configured to calculate the energy efficiency value and loss value 1L0SS of the distribution transformer according to the voltage signals and the current signals, and the upper computer is configured to record, display and store the energy efficiency value and output a test report of measuring and detecting the energy efficiency of the distribution transformer.
.An embodiment of the invention provides a storage medium having computer program stored therein, the computer program being configured to execute the abovementioned method for measuring and detecting energy efficiency of the improved distribution transformer.
The embodiments of the invention at least have the following beneficial effects.
1. The current transformers are adopted to detect difference signals of primary’ and secondary7 currents of the distribution transformer, the voltage transformers are adopted to measure difference signals of primary and secondary' voltages of the distribution transformer, and a total active power loss value of the distribution transformer under a practical operation condition may be measured and calculated, thereby obtaining the energy efficiency value of the distribution transformer.
2. The energy efficiency value of the distribution transformer under the practical working condition may be accurately measured. A measurement instrument such as the transformers introduces low uncertainties. Adaptability and practical application value is high. The energy efficiency value may be determined as an important reference for energy-saving data, and may also be applied to accurate analysis and calculation on energy efficiency measurement and energy efficiency level judgment of the distribution transformer.
BRIEF DESCRIPTION OF DRAWINGS c
The embodiments of the invention will be further described below in combination with the drawings.
FIG 1 is a schematic diagram of an equivalent two-port network model of a distribution transformer according to an embodiment of the invention.
FIG 2 is a structure diagram of an energy efficiency detection device for a distribution transformer according to an embodiment of the invention.
FIG 3 is a flowchart of a method for measuring and detecting energy efficiency of an improved distribution transformer according to an embodiment of the invention.
FIG 4 is a structure diagram of a device for measuring and detecting energy efficiency of an improved distribution transformer according to an embodiment of the invention.
DETAILED DESCRIPTION
The embodiments of the invention will be described below in detail, and examples of the embodiments are shown in the drawings, in which the same or similar reference signs always represent the same or similar components or components with the same or similar functions. The embodiments described below with reference to the drawings are exemplary and intended to explain the embodiments of the invention, and should not be understood as limits to the embodiments of the invention.
A method for measuring and detecting energy efficiency of an improved distribution transformer provided by an embodiment of the invention may provide a technical support for loss reduction, energy saving and energy efficiency level judgment of a practically operating distribution transformer.
The embodiment of the method for measuring and detecting energy efficiency of improved distribution transformer in the invention, as shown in FIG. 3, is specifically as follows.
In Step 301, an equivalent two-port network model of a distribution transformer is constructed.
As shown in FIG. 1, the equivalent two-port network model includes a distribution transformer, a virtual current source and a virtual voltage source.
The virtual current source is connected in parallel with two ends of an output end of the distribution transformer, and the virtual voltage source is connected in series with the output end.
A calculation formula for a current 1 of the virtual current source is:
- IJK2 - /2 a calculation formula for a voltage f of the virtual voltage source is:
1' where G is an input-end current of the distribution transformer, 2 is an output-end current of the distribution transformer, is a voltage between two input ends in the distribution transformer, Ms a voltage between two output ends in the js ¥ distribution transformer, and 1 and 2 are proportional constants.
In the embodiment, an input voltage of the equivalent two-port network mode!
Ϊ/ is the voltage G between the two input ends in the distribution transformer, an input current of the equivalent two-port network model is the current '1 of the input end of the distribution transformer, an output current of the equivalent two-port network model is A/^2, and an output voltage of the equivalent two-port network model is
Κ/ΛΊ.
In Step 302, an energy efficiency calculation model for the distribution transformer is determined according to the equivalent two-port network model.
In the embodiment, the energy efficiency calculation model includes an energy efficiency value ' and loss value 'L0SS of the distribution transformer.
A calculation formula for the energy efficiency valued is:
_ 1 P’+P’ ’ ' G (3} and
D a calculation formula for the loss value 1 L0SS is:
(4), where 7 | is input power of the equivalent two-port netwOrk model, and
P, is output pow'er of the equivalent two-port network model, and « - U/f Al
P is power provided by the virtual current source in the equivalent tw'o-port network model, and 1 ~ (ΐ /Λ2 _ Ή x 5 · anci
P is power provided by the virtual voltage source in the equivalent two-port network model, and ' ~ k) x !·.ι^·
In the embodiment, a difference between the input power and output power of the equivalent two-port network model formed by the distribution transformer, the virtual voltage source and the virtual current source is equal to a sum of an internal loss value of the distribution transformer, power absorbed by the virtual voltage source and power absorbed by the virtual current source.
In Step 303, an energy efficiency detection device for the distribution transformer under a practical working condition is constructed according to the energy efficiency calculation model, and a practical value of the energy efficiency of the distribution transformer is measured by the energy efficiency detection device.
In the embodiment, the energy efficiency detection device includes a current detection unit, a voltage detection unit, a power tester and an upper computer.
(1) The current detection unit includes a first current transformer and a second voltage transformer, and is configured to acquire all current signals under the practical working condition of the distribution transformer and send the current signals to the pow'er tester. As shown in FIG. 2, the current detection unit includes a first current transformer CT1 and a second current transformer CT2
CO The first current transformer
The current transformer CT1 is configured to measure the output current of the equivalent tw'o-port network model of the distribution transformer under the practical working condition.
A primary' winding of the first current transformer C’Tl is connected in series with a primary winding of the distribution transformer, and a secondary winding of the first current transformer CT1 is connected in series with a high-voltage end of a secondary winding of the distribution transformer.
In the embodiment, a transformation ratio of the first current transformer CT1 is n,:i.
(2) The second current transformer
The current transformer CT2 is configured to measure an input current of the equivalent two-port network model of the distribution transformer under the practical working condition.
A primary winding of the second current transformer CT2 is connected in series between the high-voltage end of the secondary winding of the distribution transformer and a connection point of the primary winding of the first current transformer CT1 and the high-voltage end.
.A secondary winding of the second current transformer CT2 is connected with the power tester.
In the embodiment, a transformation ratio of the second current transformer CT2 is 1:1, and a current of the secondary winding of the second current transformer CT2 is set to be a current value of the virtual current source in the equivalent two-port network model.
(2) The voltage detection unit includes a first voltage transformer and a second voltage transformer, and is configured to acquire all voltage signals of the distribution transformer under the practical working condition and send the voltage signals to the power tester. .As shown in FIG. 2, the voltage detection unit: includes a first voltage transformer VT1 and a second voltage transformer VT2.
CD The first voltage transformer
The transformer VT1 is configured to measure an input voltage of the equivalent two-port network model of the distribution transformer under the practical working condition.
A primary winding of the first voltage transformer VT1 is connected with the input end of the distribution transformer.
A low-voltage end of a secondary winding of the first voltage transformer VT1 is short-circuited with a low-voltage end of the secondary winding of the distribution transformer.
A high-voltage end of the secondary winding of the first voltage transformer VTI is connected with the high-voltage end of the secondary winding of the distribution transformer and the power tester respectively.
In the embodiment, a transformation ratio of the first voltage transformer VTI is :1, and a voltage between the high-voltage end of the secondary winding of the first voltage transformer VTI and the high-voltage end of the secondary' winding of the distribution transformer is set to be a voltage value of the virtual voltage source in the equivalent two-port network model.
(2) The second voltage transformer
The transformer VT2 is configured to measure an output voltage of the distribution transformer under the practical working condition.
A primary· winding of the second voltage transformer VT2 is connected with the output end of the distribution transformer, and a low-voltage end of a secondary winding is connected w’ith the power tester.
In the embodiment, a transformation ratio of the second voltage transformer VT2is 1:1.
(3) The power tester calculates the energy efficiency value of the distribution transformer according to the voltage signais and the current signals.
In the embodiment, the power tester receives a current signal A/Ά output by the first current transformer CT1, a current signal 7’! / ^2 A· output by the second v I current transformer CT2, a voltage signal 1 output by the first voltage transformer λΠΊ, a voltage signal F output by the second voltage transformer VT2 v IK κ and a voltage signal 1 > '? ~~ .
The power tester calculates the energy efficiency value of the distribution transformer according to the formula (3), and calculates the loss value PL0SS of the distribution transformer according to the formula (4).
(4) The upper computer is configured to record, display and store the energyefficiency value and output a test report of measuring and detecting energy efficiency of the distribution transformer.
In the embodiment, the upper computer receives the energy efficiency value and loss value ‘ L0SS sent by the power tester, and performs real-time waveform display and harmonic analysis on the data.
FIG. 4 is a structure diagram of a device for measuring and detecting energy efficiency of an improved distribution transformer according to an embodiment of the invention. As shown in FIG. 4, the device includes:
a first construction unit 41, configured to construct an equivalent two-port network model of a distribution transformer;
a determination unit 42, configured to determine an energy efficiency calculation model for the distribution transformer according to the equivalent two-port network model;
a second construction unit 43, configured to construct an energy' efficiency detection device for the distribution transformer under a practical working condition according to the energy efficiency calculation model; and a measurement unit 44, configured to measure an energy efficiency value of the distribution transformer under the practical working condition.
Herein, the equivalent two-port network model includes a distribution transformer, a virtual current source and a virtual voltage source.
The virtual current source is connected in parallel with two ends of an output end of the distribution transformer.
The virtual voltage source is connected in series with the output end.
Herein, the energy efficiency detection device includes a current detection unit, a voltage detection unit, a power tester and an upper computer.
The current detection unit is configured to acquire all current signals of the distribution transformer under the practical working condition and send the current signals to the power tester.
The voltage detection unit is configured to acquire all voltage signals of the distribution transformer under the practical working condition and send the voltage signals to the power tester.
The power tester is configured to calculate the energy efficiency value and
T) loss value ‘ of the distribution transformer according to the voltage signals and the current signals.
The upper computer is configured to record, display and store the energy efficiency value and output a test report of measuring and detecting energy efficiency of the distribution transformer.
During a practical application, a function realized by each of the units in the device of measuring and detecting energy efficiency of the improved distribution transformer may be realized by a Central Processing Unit (CPU), or Micro Processor Unit (MPU), or Digital Signal Processor (DSP), or Field Programmable Gate Array (FPGA) or the like located in a neighbor optimization device.
if being implemented in form of software function module and sold or used as an independent product, the device of measuring and detecting energy efficiency of the improved distribution transformer according to the embodiments of the invention may also be stored in a computer-readable storage medium. Based on such an understanding, the technical solutions of the embodiments of the invention substantially or parts making contributions to a conventional art may be embodied in form of software product, and the computer software product is stored in a storage medium, including a plurality of instructions configured to enable computer equipment (w'bicb may be a personal computer, a server, network equipment or the like) to execute all or part of the method of each of the embodiments of the invention. The storage medium includes various media capable of storing program codes such as a U disk, a mobile hard disk, a Read-Only Memory (ROM), a magnetic disk or an optical disk. Therefore, the embodiments of the invention are not limited to any specific hardware and software combination.
Correspondingly, an embodiment of the invention further provides a storage medium having a computer program stored therein, the computer program being configured to execute the method of measuring and detecting energy efficiency of the improved distribution transformer according to the embodiments of the invention.
It should finally be noted that, the described embodiments are not all embodiments but only part of embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments in the invention w'ithout creative work fall w'ithin the scope of protection of the invention.

Claims (12)

1. A method for measuring and detecting energy efficiency of an improved distribution transformer, comprising:
constructing an equivalent two-port network model of the distribution transformer;
determining an energy efficiency calculation model for the distribution transformer according to the equivalent two-port network model; and constructing an energy efficiency detection device for the distribution transformer under a practical working condition according to the energy efficiency calculation model, thereby measuring an energy efficiency value of the distribution transformer under the practical working condition.
2. The method according to claim I, wherein the equivalent two-port network model comprises a distribution transformer, a virtual current source and a virtual voltage source;
the virtual current source is connected in parallel with two ends of an output end of the distribution transformer; and the virtual voltage source is connected in series with the output end.
3. The method according to claim 2, wherein a calculation formula for a current 7’ of the virtual current source is:
where 7. is an input-end current of the distribution transformer, 7 2 is an output-end current of the distribution transformer, ^2 is a proportional constant, and 7/'^2 is an output current of the equivalent two-port network model; and a calculation formula for a voltage of the virtual voltage source is:
r = vjx - v2 ?
where is a voltage between two input ends in the distribution transformer,
V K 2 is a voltage between two output ends in the distribution transformer, is a
V /K proportional constant, and 1 is an output voltage of the equivalent two-port network model.
4. The method according to claim 1 or 3, wherein the energy efficiency calculation r P model comprises the energy efficiency value '' and loss value 'Lass of the distribution transformer; and a calculation formula for the energy efficiency' value '7 is:
z/
K,K, /+/ and a calculation formula for the loss value L0SS is:
/oss - / - / + P +Pwhere 5 * 7 J is input power of the equivalent two-port network model, and / ] = V} x .
P 2 is output power of the equivalent two-port network model, and
X - I'V/(A).
P is power provided by the virtual current source in the equivalent two-port network model, and 1 ~ “ P* ; and
P’’ is power provided by the virtual voltage source in the equivalent two-port network model, and ? (h/T M x Η/Λ2 .
5. The method according to claim 1, wherein the energy efficiency detection device comprises a current detection unit, a voltage detection unit, a power tester and an upper computer;
the current detection unit is configured to acquire all current signals of the distribution transformer under the practical working condition and send the current signals to the power tester;
the voltage detection unit is configured to acquire all voltage signals of the distribution transformer under the practical working condition and send the voltage signals to the power tester;
the power tester calculates the energy efficiency value and loss value ^-oss of the distribution transformer according to the voltage signals and the current signals; and the upper computer is configured to record, display and store the energy efficiency value and output a test report of measuring and detecting the energy efficiency of the distribution transformer.
6. The method according to claim 5, wherein the current detection unit comprises a first current transformer and a second current transformer; the first current transformer is configured to measure the output current of the equivalent two-port network model of the distribution transformer under the practical working condition, the second current transformer is configured to measure an input current of the equivalent two-port network model of the distribution transformer under the practical working condition;
a primary winding of the first current transformer is connected in series with a primary' winding of the distribution transformer, and a secondary’ winding of the first current transformer is connected in series with a high-voltage end of a secondary' winding of the distribution transformer;
a primary winding of the second current transformer is connected in series between a connection point of the primary' winding of the first current transformer and the high-voltage end and the high-voltage end; and a secondary' winding of the second current transformer is connected with the power tester.
7. The method according to claim 5, wherein the voltage detection unit comprises a first voltage transformer and a second voltage transformer; the first voltage transformer is configured to measure an input voltage of the equivalent two-port network model of the distribution transformer under the practical working condition; the second voltage transformer is configured to measure an output voltage of the distribution transformer under the practical working condition;
a primary winding of the first voltage transformer is connected with the input end of the distribution transformer, a low-voltage end of a secondary' winding is shortcircuited with a low-voltage end of the secondary winding of the distribution transformer, and a high-voltage end of the secondary winding is connected with the high-voltage end of the secondary winding of the distribution transformer and the power tester respectively; and a primary winding of the second voltage transformer is connected with the output end of the distribution transformer, and a low-voltage end of a secondarywinding is connected with the power tester.
8. The method according to claim 6 or 7, wherein a transformation ratio of the first current transformer is //,:1, a transformation ratio of the second current transformer is 1:1, and a current of the secondary- winding thereof is set to be a current value of the virtual current source in the equivalent two-port network model;
a transformation ratio of the first voltage transformer is :1, and a voltage between the high-voltage end of the secondary' winding thereof and the high-voltage end of the secondary' winding of the distribution transformer is set to be a voltage value of the virtual voltage source in the equivalent two-port network model; and a transformation ratio of the second voltage transformer is 1:1,
K K wherein J 1 and 2 are both proportional constants.
9. A device for measuring and detecting energy efficiency of an improved distribution transformer, comprising:
a first construction unit, configured to construct an equivalent two-port network model of the distribution transformer;
a determination unit, configured to determine an energy efficiency calculation model for the distribution transformer according to the equivalent two-port network model;
a second construction unit, configured to construct an energy' efficiencydetection device for the distribution transformer under a practical working condition according to the energy- efficiency calculation model; and a measurement unit, configured to measure an energy efficiency value of the distribution transformer under the practical working condition.
10. The device according to claim 9, wherein the equivalent two-port network model comprises a distribution transformer, a virtual current source and a virtual voltage source;
the virtual current source is connected in parallel with two ends of an output end ofthe distribution transformer; and the virtual voltage source is connected in series with the output end.
11. The device according to claim 9, wherein the energy efficiency detection device comprises a current detection unit, a voltage detection unit, a power tester and an upper computer;
the current detection unit is configured to acquire all current signals of the distribution transformer under the practical working condition and send the current signals to the power tester;
the voltage detection unit is configured to acquire all voltage signals of the distribution transformer under the practical working condition and send the voltage signals to the power tester;
the power tester is configured to calculate the energy efficiency value r'! and loss value ?L0SS of the distribution transformer according to the voltage signals and the current signals; and the upper computer is configured to record, display and store the energy efficiency value and output a test report of measuring and detecting the energyefficiency of the distribution transformer.
12. A storage medium having computer-executable instructions stored therein, the computer-executable instructions being configured to execute the method for measuring and detecting energy efficiency of the improved distribution transformer according to any one of claims 1-8.
International application No.
PCT/CN2016/088019
INTERNATIONAL SEARCH REPORT
A. CLASSIFICATION OF SUBJECT MATTER G01R 31/00 (2006.01) i; G01R 21/06 (2006.01) i According to International Patent Classification (IPC) or to both national classification and IPC B. FIELDS SEARCHED Minimum documentation searched (classification system followed by classification symbols) G01R 31/-, G01R 21 / Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched Electronic data base consulted during the international search (name of data base and, where practicable, search terms used) CNPAT, WPI, EPODOC, CNKI, transformer, energy, efficiency, loss, voltage, current, inductor, virtual, model, formula, calculat+, port, input, output C. DOCUMENTS CONSIDERED TO BE RELEVANT Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No. PX X A A CN 105182126 A (CHINA ELECTRIC POWER RESEARCH INSTITUTE et al.) 23 December 2015 (23.12.2015) claims 1-8, description, paragraphs [0005]-[0101 ], and figures 1 and 2 CN 104407209 A (STATE GRID CORP CHINA et al.) 11 March 2015 (11.03.2015) description, paragraphs [0005]-[0120], and figures 1-4 CN 104502691 A (ZHENJIANG CHANGHE ELECTRIC POWER TECHNOLOGY CO., LTD.) 08 April 2015 (08.04.2015) the whole document CN 104569664 A (ZHENJIANG CHANGHE ELECTRIC POWER TECHNOLOGY CO., LTD.) 29 April 2015 (29.04.2015) the whole document 1-12 1-12 1-12 1-12 13 Further documents are listed in the continuation of Box C. 13 See patent family annex. * Special categories of cited documents: “T” later document published after the international filing date or priority date and not in conflict with the application but “A” document defining the general state of the art which is not cited t0 understand the principle or theory underlying the considered to be of particular relevance invention “E” earlier application or patent but published on or after the ‘‘X” document of particular relevance; the claimed invention international filing date cannot be considered novel or cannot be considered to involve an inventive step when the document is taken alone “L” document which may throw doubts on priority claim(s) or .... . . . .. . . ,,. .· . . r ., “Y” document of particular relevance; the claimed invention which is cited to establish the publication date of another . · , , · , · ,, cannot be considered to involve an inventive step when the citation or other special reason (as specified) document is combined with one or more other such “O” document referring to an oral disclosure, use, exhibition or documents, such combination being obvious to a person other means skilled in the art “P” document published prior to the international filing date “&”document member of the same patent family but later than the priority date claimed Date of the actual completion of the international search 01 September 2016 Date of mailing of the international search report 21 September 2016 Name and mailing address of the ISA State Intellectual Property Office of the P. R. China No. 6, Xitucheng Road, Jimenqiao Haidian District, Beijing 100088, China Facsimile No. (86-10) 62019451 Authorized officer YANG, Bin Telephone No. (86-10) 62413474
Form PCT/ISA/210 (second sheet) (July 2009)
International application No.
PCT/CN2016/088019
INTERNATIONAL SEARCH REPORT
C (Continuation). DOCUMENTS CONSIDERED TO BE RELEVANT Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No. A A A A A A A A CN 104515919 A (ZHENJIANG CHANGHE ELECTRIC POWER TECHNOLOGY CO., LTD.) 15 April 2015 (15.04.2015) the whole document CN 103926491 A (STATE GRID CORP CHINA et al.) 16 July 2014(16.07.2014) the whole document CN 102393494 A (CHONGQING UNIVERSITY) 28 March 2012 (28.03.2012) the whole document CN 102914706 A (CHINA ELECTRIC POWER RESEARCH INSTITUTE et al.) 06 February 2013 (06.02.2013) the whole document CN 104076226 A (WUHAN UNIVERSITY) 01 October 2014 (01.10.2014), the whole document US 2005212506 Al (KHALIN, VLADIMIR M. et al.) 29 September 2005 (29.09.2005) the whole document US 7106078 BI (JAMES G. BIDDLE COMPANY) 12 September 2006 (12.09.2006) the whole document WO 2014035325 Al (MEGGER SWEDEN AB) 06 March 2014 (06.03.2014), the whole document 1-12 1-12 1-12 1-12 1-12 1-12 1-12 1-12
Form PCT/ISA/210 (continuation of second sheet) (July 2009)
INTERNATIONAL SEARCH REPORT
Information on patent family members
International application No.
PCT/CN2016/088019
Patent Documents referred in the Report Publication Date Patent Family Publication Date CN 105182126 A 23 December 2015 None CN 104407209 A 11 March 2015 None CN 104502691 A 08 April 2015 None CN 104569664 A 29 April 2015 None CN 104515919 A 15 April 2015 None CN 103926491 A 16 July 2014 CN 103926491 B 09 March 2016 CN 102393494 A 28 March 2012 None CN 102914706 A 06 February 2013 CN 102914706 B 11 November 2015 CN 104076226 A 01 October 2014 None US 2005212506 Al 29 September 2005 CA 2496214 Al 04 August 2005 US7030602 B2 18 April 2006 CA 2496214 C 07 June 2011 US 7106078 BI 12 September 2006 None WO 2014035325 A1 06 March 2014 US 2015168478Al 18 June 2015 EP 2890991 Al 08 July 2015
Form PCT/ISA/210 (patent family annex) (July 2009)
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