RU2651610C1  Method for revealing the places of origin and magnitude of nontechnical losses of energy in electrical networks by data of synchronous measurements  Google Patents
Method for revealing the places of origin and magnitude of nontechnical losses of energy in electrical networks by data of synchronous measurements Download PDFInfo
 Publication number
 RU2651610C1 RU2651610C1 RU2016151348A RU2016151348A RU2651610C1 RU 2651610 C1 RU2651610 C1 RU 2651610C1 RU 2016151348 A RU2016151348 A RU 2016151348A RU 2016151348 A RU2016151348 A RU 2016151348A RU 2651610 C1 RU2651610 C1 RU 2651610C1
 Authority
 RU
 Russia
 Prior art keywords
 non
 technical
 losses
 network
 power
 Prior art date
Links
 230000001360 synchronised Effects 0 abstract title 4
 238000005259 measurements Methods 0 abstract title 3
 238000009826 distribution Methods 0 abstract 3
 238000004870 electrical engineering Methods 0 abstract 2
 230000000694 effects Effects 0 abstract 1
 230000001965 increased Effects 0 abstract 1
 230000001603 reducing Effects 0 abstract 1
 238000006722 reduction reaction Methods 0 abstract 1
 239000000126 substances Substances 0 abstract 1
Images
Classifications

 G—PHYSICS
 G01—MEASURING; TESTING
 G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
 G01R11/00—Electromechanical arrangements for measuring time integral of electric power, i.e. electric energy or current, e.g. of consumption
 G01R11/02—Constructional details
 G01R11/17—Compensating for errors; Adjusting or regulating means therefor
 G01R11/19—Compensating for errors caused by disturbing torque, e.g. rotatingfield errors of polyphase meters
Abstract
Description
The invention relates to the field of electrical engineering. The method includes assessing the state of the electric network based on synchronous measurements of the network parameters and identifying places of occurrence and values of nontechnical energy losses in electric networks according to the data of synchronous measurements of current and voltage vectors. The invention improves the reliability and efficiency of identifying sections of the electric network having an increased level of nontechnical energy losses.
The invention relates to the field of electrical engineering and can be used to reliably and quickly identify places of the electric network with an increased level of nontechnical energy losses, which allows you to quickly take technical and organizational measures to eliminate the sources and causes of losses. The invention can be used to build automated informationmeasuring systems for the commercial accounting of electricity as their main or additional function.
One of the main problems of the domestic and foreign electric power complex is the high level of actual losses of electric energy in distribution electric networks, including their nontechnical (commercial) component, mainly due to the neglected use and theft of electricity. As domestic and foreign experience shows, the value of the nontechnical component of electricity losses is mainly present in the structure of losses in distribution networks with a voltage of 0.3810 kV.
The issue of determining nontechnical losses is one of the main issues in distribution electric networks. The function of identifying places of occurrence and values of nontechnical losses is in demand in domestic and foreign power supply organizations, while it is implemented only in a small number of automated systems for commercial accounting of electricity and, as a rule, it is limited to the function of calculating unbalances of electric energy, as well as the estimated probability of theft with a low reliability based on statistical methods based on the analysis of consumption by each subscriber in the previous s intervals, which does not allow to identify foci of increased levels of nontechnical losses and electricity theft place up to a particular user. At the same time, the installation of these systems as one of the main goals is to reduce nontechnical energy losses.
To date, several methods are known for detecting nontechnical energy losses. These include:
A method for detecting uncontrolled electricity consumption in 0.4 kV networks (RF patent for the invention No. 2251703). The essence of the method consists in sequentially disconnecting and connecting the load of consumers and installing additional devices. After disconnecting the load of all commercial consumers from the power supply line, the power consumption of the power supply line is measured, the measured value is compared with the calculated value of the power consumption of the line. With a significant discrepancy between the calculated and measured power, it is concluded that there are nontechnical losses of electricity. The disadvantage of this method is the need to disconnect the load of consumers, which can lead to interruptions in power supply and increases the cost of operating the system. In addition, this method only allows to identify the fact of the presence of nontechnical losses, but does not accurately localize the source of these losses.
A method for determining technological losses of electricity in an alternating current traction network (RF patent for the invention No. 2267410 of 06.22.2004). The essence of the method is the synchronous measurement of current and voltage on each feeder of the contact network of each traction substation and on electric locomotives with a frequency of 0.1 to 1 minute. According to these data, electricity costs are calculated at traction substations and at electric locomotives. Then, technological losses of electric energy in the traction network are determined as the difference between the values of electric energy consumption at traction substations and at electric locomotives. Knowing the technological losses of electricity, nontechnical losses can be defined as the difference between the actual losses and the technological ones. Despite the fact that the proposed method, in contrast to the previous one, does not require periodic blackouts of consumers, it, like the previous one, only reveals the presence of nontechnical losses, but does not accurately localize the source of these losses.
For the closest analogue, a method has been adopted for detecting uncontrolled electricity consumption in an electric network of 0.4 kV (RF patent for the invention No. 2265858). The method according to the specified patent consists in synchronous passive measurements of the parameters of the network mode and comparing the measured voltages and calculated values. The load of commercial consumers is connected to the power supply line through executive subscriber devices that are controlled remotely via a radio channel, can measure instantaneous voltage and current values, calculate the actual voltage values and the consumed load current for a period from the measured values, write them to memory via a radio channel transmitted from the center team, characterized in that at the same time measure the instantaneous values of voltages and load currents at all points of connection of consumers power lines, calculate from the measured values the effective values of the voltage and the consumed load current for the period, the measured values are stored in the device memory, the measured values of the voltages and currents of the loads are read, the total resistance of the loads of the consumers is calculated from the measured values, the phase voltages are calculated in all places of the load connection using the equivalent circuit of the power line, calculate the difference between the calculated and measured voltage values at each network node, identify places of uncontrolled electricity consumption by the maximum values of the difference between the calculated and measured values of phase voltages and the values of uncontrolled power consumption. In those nodes where uncontrolled load takes place, the difference between the measured and calculated voltages will be the largest.
The disadvantage of this method is that it involves the use of operating parameters (current values of currents and voltages, active power) from traditional measuring devices for distribution networks. However, at present, the level of development of electronic, information, and communication technologies has reached such a level that it has become possible to switch without a significant increase in cost to newgeneration measuring systems that make it possible to perform qualitatively new measurements of operating parameters, which makes it possible to significantly modernize existing methods for identifying places of occurrence and values of nontechnical losses energy in electric networks, significantly increase the accuracy of localization of places of unauthorized consumption.
The aim of the invention is to reduce the error in identifying places of occurrence and the values of nontechnical energy losses in electric networks through the use of modern means of measuring current and voltage vectors.
Distinctive features of the claimed invention from the prototype are the following:
1. The use of highprecision (less than 1 ms) synchronous measurements of the operational parameters of the network is assumed.
2. Used additional operational parameters of the network, namely the phase angles of the currents and voltages of the network loads.
The technical result that can be obtained using the proposed method is to reduce costs during the operation of distribution electric networks of 0.410 kV of the electric power system by quickly identifying foci of nontechnical energy losses, increasing the reliability of determining the magnitude of nontechnical losses in network sections in an automated system commercial electricity metering for technical and organizational measures for their subsequent elimination.
The essence of the proposed method, we consider the example of a simple threephase feeder that feeds two consumers. We assume that the feeder mode is sinusoidal and symmetrical, which allows us to consider a singlephase equivalent circuit (Fig. 1).
Suppose that a measuring device has been installed in the power center and at the consumers, which makes it possible to measure current and voltage vectors, as well as active and reactive power. Assume that there are nontechnical power losses in the network, that is:
Where
 full power of the power center; full load power;
dS _{12}  technical power loss in line 12;
dS _{23}  technical power loss in line 23.
It is necessary to localize nodes with nontechnical power losses and determine the actual power values.
Knowing the voltage and phase angles, as well as the resistance of the lines Z _{12} and Z _{23} , it is possible to calculate the complexes of currents in the lines:
and complexes of load currents:
as well as load capacity complexes:
Comparing the measured S _{2meas} , S _{3meas} and the calculated S _{2calc} , S _{3calculation} of load power, we can conclude that there are nontechnical power losses in the corresponding node. If
, where ε is the permissible calculation error, then the power measurements in the node are reliable, there are no nontechnical power losses. The calculation error ε depends on the accuracy of setting the passive parameters of the network elements; it can be calculated empirically or by mathematical modeling for a specific network. The claimed invention has several modifications:1. Formulas (1)  (4) can be used for synchronous measurements of current vectors and network load voltages at given times.
2. Formulas (1)  (4) can be used for averaged measurements of current vectors and network load voltages for a certain time interval.
3. Formulas (1)  (4) can be used in phase coordinates or decomposed into symmetrical components.
4. Formulas (1)  (4) can be used only for the fundamental harmonic, or for the entire spectrum of harmonics present in the electrical network.
5. To improve accuracy, mutual induction between the phase wires of the network lines can be taken into account.
The listed modifications are accurate and depend on the technical features of the used measuring devices.
Claims (1)
 A method for identifying places of occurrence and values of nontechnical energy losses in electric networks according to the data of synchronous measurements, which consists in the ability to determine the value of nontechnical energy losses in each node of electric networks and with a high degree of efficiency and reliability to determine the places of unaccounted for electricity consumption up to an individual consumer, characterized in that an approach based on the estimation of synchronously measured current and voltage vectors, the calculation of the measured eyelids to the voltage tori in the load nodes and the current supply center in all network elements and the subsequent comparison of the calculated and measured load powers, based on which it is concluded that there are no or nontechnical losses of electricity in each network node, allowing for the asymmetry of loads, repeated grounding, and mutual induction between wires phases and nonsinusoidality of both the current consumption and the voltage of the power source, is designed to reduce the cost of operating distribution electric networks.
Priority Applications (1)
Application Number  Priority Date  Filing Date  Title 

RU2016151348A RU2651610C1 (en)  20161227  20161227  Method for revealing the places of origin and magnitude of nontechnical losses of energy in electrical networks by data of synchronous measurements 
Applications Claiming Priority (1)
Application Number  Priority Date  Filing Date  Title 

RU2016151348A RU2651610C1 (en)  20161227  20161227  Method for revealing the places of origin and magnitude of nontechnical losses of energy in electrical networks by data of synchronous measurements 
Publications (1)
Publication Number  Publication Date 

RU2651610C1 true RU2651610C1 (en)  20180423 
Family
ID=62045341
Family Applications (1)
Application Number  Title  Priority Date  Filing Date 

RU2016151348A RU2651610C1 (en)  20161227  20161227  Method for revealing the places of origin and magnitude of nontechnical losses of energy in electrical networks by data of synchronous measurements 
Country Status (1)
Country  Link 

RU (1)  RU2651610C1 (en) 
Cited By (1)
Publication number  Priority date  Publication date  Assignee  Title 

RU2700289C1 (en) *  20190123  20190916  федеральное государственное автономное образовательное учреждение высшего образования "СевероКавказский федеральный университет"  METHOD OF DETERMINING PLACES OF UNCONTROLLED ELECTRIC POWER CONSUMPTION IN ELECTRIC NETWORK 0,4 kV 
Citations (3)
Publication number  Priority date  Publication date  Assignee  Title 

EP0627083B1 (en) *  19920221  19980429  ABB Power T&D Company Inc.  Method and apparatus for electronic meter testing 
EP0980002A1 (en) *  19980713  20000216  Powercom Control Systems Ltd.  A device for detecting and reporting theft of electric power 
RU150986U1 (en) *  20140625  20150310  Андрей Иванович Колбасенко  Device for input and accounting of electric energy in distribution networks of low voltage with theft protection 

2016
 20161227 RU RU2016151348A patent/RU2651610C1/en active
Patent Citations (3)
Publication number  Priority date  Publication date  Assignee  Title 

EP0627083B1 (en) *  19920221  19980429  ABB Power T&D Company Inc.  Method and apparatus for electronic meter testing 
EP0980002A1 (en) *  19980713  20000216  Powercom Control Systems Ltd.  A device for detecting and reporting theft of electric power 
RU150986U1 (en) *  20140625  20150310  Андрей Иванович Колбасенко  Device for input and accounting of electric energy in distribution networks of low voltage with theft protection 
NonPatent Citations (1)
Title 

Статья: "АНАЛИЗ МЕТОДОВ ОБНАРУЖЕНИЯ НЕТЕХНИЧЕСКИХ ПОТЕРЬ ЭЛЕКТРОЭНЕРГИИ", Ж.: СИСТЕМНЫЙ АНАЛИЗ В НАУКЕ И ОБРАЗОВАНИИ, Номер: 4 (30), 2015. * 
Cited By (1)
Publication number  Priority date  Publication date  Assignee  Title 

RU2700289C1 (en) *  20190123  20190916  федеральное государственное автономное образовательное учреждение высшего образования "СевероКавказский федеральный университет"  METHOD OF DETERMINING PLACES OF UNCONTROLLED ELECTRIC POWER CONSUMPTION IN ELECTRIC NETWORK 0,4 kV 
Similar Documents
Publication  Publication Date  Title 

EP2204658A1 (en)  Meter phase identification  
AU2011313840B2 (en)  Apparatus and method for fault detection and location determination  
Milanovic et al.  The influence of fault distribution on stochastic prediction of voltage sags  
US6657424B1 (en)  DC load detection in an electric utility meter  
US7584066B2 (en)  Method for determining power flow in an electrical distribution system  
Hui et al.  Assessing utility harmonic impedance based on the covariance characteristic of random vectors  
US9702923B2 (en)  Method and apparatus for monitoring electric power transmission, disturbances and forecasts  
US8319658B2 (en)  Process, device and system for mapping transformers to meters and locating nontechnical line losses  
EspinosaJuarez et al.  A method for voltage sag state estimation in power systems  
Majidi et al.  Fault location in distribution networks by compressive sensing  
RU2428708C2 (en)  Calibration method and system of measuring instruments  
US9945889B2 (en)  Method for detecting power theft in a power distribution system  
US7961112B2 (en)  Continuous condition monitoring of transformers  
BRPI1102305A2 (en)  System and method  
Mokhlis et al.  Nonlinear representation of voltage sag profiles for fault location in distribution networks  
Peppanen et al.  Leveraging AMI data for distribution system model calibration and situational awareness  
EP2439547B1 (en)  Systems, methods and devices for monitoring a capacitor bank  
Della Giustina et al.  Electrical distribution system state estimation: measurement issues and challenges  
Kusic et al.  Measurement of transmission line parameters from SCADA data  
BRPI1105683A2 (en)  Method and device for determining the structure of an electrical distribution network  
Korres et al.  State estimation in multi‐microgrids  
Muscas et al.  Impact of different uncertainty sources on a threephase state estimator for distribution networks  
JP6242354B2 (en)  Failure place analysis method and system for ungrounded distribution system  
JP5010011B2 (en)  Power consumption measuring system and power consumption measuring method  
Yuan et al.  A comparative study of measurementbased Thevenin equivalents identification methods 