JP2014079138A - Monitor system and monitor apparatus for distribution system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitor system and monitor apparatus for distribution system, capable of detecting generation of power theft with high precision even when information collection from each meter is asynchronous.SOLUTION: A monitor system 10 includes: a high-voltage distribution line 11 that is connected with a high-order system 14 and receives power supply from a power company; a low-voltage distribution line 3 that performs step-down from the high-voltage distribution line 11 and supplies electric power to each of users 1-1 to 1-3; user meters 2-1 to 2-3 that measures electric energy of each of the users; a linkage point meter 12 mounted at a linkage point that links to the high-order system 14 in the high-voltage distribution line 11; and a monitor apparatus 15 that detects power theft on the basis of electric energy measured by the user meters 2-1 to 2-3 and the linkage point meter 12.

Description

  Embodiments described herein relate generally to a distribution system monitoring system and a monitoring apparatus capable of accurately detecting the occurrence of theft.

  In some distribution systems in emerging countries and other areas, power loss has been greatly increased, and electricity theft (hereinafter referred to as power theft) may be a major factor.

  In recent years, the introduction of smart meters (hereinafter referred to as meters) that can measure other electrical quantities such as reverse power flow and can directly collect data to a monitoring device through two-way communication has been promoted.

  The main purpose of this is to improve the efficiency of meter reading work for consumers' electricity usage, but it is possible to collect the data directly by the monitoring device, and to detect the occurrence of theft from meter information. Is expected to be realized.

  Regarding the detection of the occurrence of theft, for example, a monitoring system has been proposed that detects the presence or absence of an abnormality such as theft by comparing the amount of power supplied and the amount of power used for each area.

Japanese Patent No. 3733910

  However, in the above monitoring system, information collection of each meter installed in each area is performed without synchronization, and thus errors due to asynchrony have been a problem.

  That is, in order to detect theft, it is necessary to calculate a state quantity necessary for determination from a plurality of pieces of meter information. However, in general, information collection is asynchronous in each meter, and a shift occurs in the measurement time zone. For this reason, the accuracy of calculation of the state quantity used for the determination is poor, which may cause a detection error.

  An object of the embodiment of the present invention is to provide a distribution system monitoring system and a monitoring apparatus capable of accurately detecting the occurrence of theft even if information collection from each meter is asynchronous.

  In order to achieve the above object, a distribution system monitoring system according to an embodiment of the present invention includes a high-voltage distribution line connected to a higher-order system and receiving power supply from an electric power company, and a voltage step-down from the high-voltage distribution line. A low-voltage distribution line that supplies power to the house, a consumer measuring unit that measures the amount of power of each consumer, and a higher system side than the consumer measuring unit, and measures the amount of power at that position. A connection point measuring means; and a monitoring device that detects theft based on the amount of power measured by the consumer measuring means and the connection point measuring means, the monitoring device comprising the consumer measuring means and A collecting unit that collects the electric energy measured by the connection point measuring means, and an added electric energy for each consumer obtained by continuously adding the electric energy measured by the consumer measuring means for at least 10 hours. There, wherein the calculator for calculating a difference ratio between the amount of power measured by the interconnection point measurement means, to have a, a determination unit power theft on the basis of the calculation result.

  In addition, the monitoring device according to the embodiment of the present invention includes a consumer measuring unit that measures a consumer's power amount and a power amount measured by a connection point measuring unit provided on a higher system side than the consumer measuring unit. And a power amount measured by the interconnection point measuring means, using an added power amount for each consumer obtained by continuously adding at least 10 hours the power amount measured by the consumer measuring means, And a determination unit that determines theft based on the calculation result.

1 is a schematic diagram illustrating an overall configuration of a monitoring system according to a first embodiment of the present invention. It is a block diagram which shows the structure of the monitoring apparatus in the monitoring system of FIG. It is a graph explaining the influence of the error by asynchronous when information collection from a meter is performed for 120 minutes, (a) is when measuring at the standard timing, (b) is 30 minutes earlier than the standard timing, ( c) shows a case 30 minutes later than the standard timing. It is a graph explaining the influence of the error by asynchronous when information collection from a meter is performed for 90 minutes, (a) is when measured at the standard timing, (b) is 30 minutes earlier than the standard timing, ( c) shows a case 30 minutes later than the standard timing. It is a graph explaining the influence of the error by asynchronous when collecting information from the meter for 180 minutes, (a) when measuring at the standard timing, (b) when 30 minutes earlier than the standard timing, ( c) shows a case 30 minutes later than the standard timing. It is the schematic which shows the partial structure of the monitoring system which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the monitoring apparatus in the monitoring system of FIG.

  Embodiments of the present invention will be specifically described below with reference to the drawings.

[First embodiment]
(overall structure)
FIG. 1 shows the overall configuration of a monitoring system according to the first embodiment of the present invention.
The monitoring system 10 of this embodiment is roughly divided into a high-voltage distribution system and a low-voltage distribution system. First, in the high voltage distribution system, the high voltage distribution line 11 is connected to the upper system 14 via the distribution transformer 13, and power is supplied from the upper system 14. In addition, a connection point meter 12 for measuring the amount of electric power is installed at the connection point of the high-voltage distribution line 11 with the upper system 14 so that the measurement information is sent to the monitoring device 15 that performs data processing necessary for monitoring. It has become. Further, a plurality of low voltage distribution systems are connected to the high voltage distribution line 11.

  In the low-voltage distribution system, the voltage is stepped down from the high-voltage distribution line 11 by the pole transformer 4, and is supplied to the consumers A, B, and C (1-1, 1-2, 1-3) through the respective low-voltage distribution lines 3. Power is supplied. Further, the consumers A, B, C (1-1, 1-2, 1-3) are provided with meters 2-1, 2-2, 2-3 for measuring the amount of electric power, respectively, and the monitoring device 15 Measurement information is sent to

(Configuration of the monitoring device 15)
FIG. 2 is a block diagram showing the configuration of the monitoring device 15.
The monitoring device 15 includes a collection unit 16 that collects electric energy from the meters 2-1, 2-2, 2-3 and the connection point meter 12, and each customer A, B, C (1-1, 1-1). 2, 1-3) has a calculation unit 17 that calculates the difference between the total amount of electricity and the amount of electricity in the connection point meter 12, and a determination unit 18 that determines theft based on the calculation result.

  The collection unit 16 is a means for acquiring the amount of power from each meter 2-1, 2-2, 2-3 and 12 at a constant time interval (30 minutes in Japan). Here, the amount of electricity is a value obtained by subtracting the reverse flow rate from the amount of power used measured by the meters 2-1, 2-2, 2-3 of each customer and the connection point meter 12 of the distribution system.

  Although the time intervals at which the meters are measured are the same, there is a difference in the target measurement time zone (start time and end time). Therefore, the calculation unit 17 does not simply use the electric energy collected at regular time intervals, but reduces the error due to the asynchronous information collection of each meter by using the total value of a plurality of consecutive periods.

This point will be described in detail with reference to FIGS.
First, let us consider a case where the amount of power collected every 30 minutes from an arbitrary meter changes as shown in FIG. 3 from time I to time VIII (time I to time VIII are each in units of 30 minutes). Further, as shown in FIG. 3A, when the measurement is performed at the standard timing, the period in which the electric energy is added is 120 minutes of four sets of times III, IV, V, and VI. Next, assuming that the timing shift in the measurement target time zone is 30 minutes, when the time is 30 minutes earlier than the standard timing, as shown in FIG. 3B, the period for adding the electric energy is time II, III, IV, V It becomes. On the other hand, when it is 30 minutes later than the standard timing, as shown in FIG. 3C, the periods for adding the electric energy are times IV, V, VI, and VII.

  For this reason, in FIGS. 3A to 3C, the total electric energy is different, but two sets (60 minutes) of time IV and V are always selected even if the timing is around 30 minutes. ing. Therefore, a correct value that is not influenced by the timing can be acquired for 60 minutes, which is 1/2 of the 120 minutes (four sets of time III, IV, V, and VI) in which the electric energy is added.

  Next, in FIG. 4, assuming that the amount of power every 30 minutes from any meter changes from time I to time VIII in the same manner as in FIG. 3, measurement is performed at standard timing as shown in FIG. In this case, the period for adding the electric energy is 90 minutes of three sets of time III, IV, and V. Assuming that the timing shift in the measurement target time zone is 30 minutes, when the time is 30 minutes earlier than the standard timing, the periods for adding the electric energy are times II, III, and IV as shown in FIG. On the other hand, when it is 30 minutes later than the standard timing, as shown in FIG. 4C, the periods for adding the electric energy are times IV, V, and VI.

  For this reason, in FIGS. 4A to 4C, the total power amount is different, but only one set of time IV (30 minutes) is always selected even if the timing is around 30 minutes. Therefore, a correct value that is not influenced by the timing can be acquired for 30 minutes, which is 1/3 of the 90 minutes (three sets of time III, IV, and V) in which the electric energy is added.

  On the other hand, in FIG. 5, assuming that the amount of power every 30 minutes from any meter changes from time I to time VIII in the same manner as in FIG. 3, the measurement is performed at the standard timing as shown in FIG. The period for adding the electric energy is 180 minutes of six sets of time II, III, IV, V, VI, and VII. Assuming that the timing shift in the measurement target time zone is 30 minutes, when the time is 30 minutes earlier than the standard timing, as shown in FIG. 5B, the period for adding the electric energy is time I, II, III, IV, V, VI. On the other hand, when it is 30 minutes later than the standard timing, as shown in FIG. 4C, the period for adding the electric energy is time III, IV, V, VI, VII, VIII.

  Therefore, in FIGS. 5 (a) to 5 (c), the total amount of electric power is different, but for four sets (120 minutes) of time III, IV, V, and VI, the timing is around 30 minutes. Even always selected. Therefore, a correct value that is not affected by the timing can be acquired for 120 minutes, which is 2/3 of the 180 minutes (6 sets of time II, III, IV, V, VI, and VII) in which the electric energy is added. it can.

  As described above, if the period for adding the electric energy is set to be long, the ratio of the electric energy part that is not affected by the measurement timing can be increased, and thus an error from the actual electric energy can be reduced. However, if the period for adding the power amount is set to be long, the ratio of the amount of theft to the total amount of power becomes small, and it becomes difficult to determine whether the power usage is abnormal (theft) or an error. For this reason, the time for adding the electric energy is at least 10 hours or more, preferably 10 to 24 hours. This is because if it is 10 hours or longer, the amount of theft is 10% or more of the total supply amount while reducing an error with the actual amount of power, and the determination of theft is easy.

(Function)
Hereinafter, an operation of determining theft by the monitoring system 10 will be described.
First, the electric energy result of the period is measured at intervals of 30 minutes by the meters 2-1, 2-2, 2-3 and the connection point meter 12. Next, the collection unit 16 of the monitoring device 15 collects the power amount information and records it in the past. Further, the calculation unit 17 of the monitoring device 15 picks up information on Wa1 to Wa2n, Wb1 to Wb2n, and Wc1 to Wc2n from the collection status at that time, according to the following equations (1) to (4). The total electric energy for n hours of each customer and the connection point is calculated, and the electric energy difference rate is calculated by the following equation (5).

Wa = Wa1 + Wa2 + ... Wa2n (1)
Wb = Wb1 + Wb2 + ... Wb2n (2)
Wc = Wc1 + Wc2 + ... Wc2n (3)
Ws = Ws1 + Ws2 + ... Ws2n (4)
Electric energy difference rate [%] = {Ws− (Wa + Wb + Wc)} / Ws × 100 (5)

  Here, Wa is the total power amount of consumer A (total power amount of continuous time) [Wh], Wb is the total power amount of consumer B (total power amount of continuous time) [Wh], and Wc is customer C. The total power amount (total power amount in continuous time) [Wh], Ws is the total power amount (total power amount in continuous time) [Wh] at the interconnection point. Wa1... Ws1 is the latest 30-minute power amount of each meter, Wa2... Ws2 is the 30-minute power amount 30 minutes before each meter, and Wa3... Ws3 is 60 minutes of each meter. The previous 30-minute power amount,..., Wa2n... Ws2n is the 30-minute power amount 30 × (2n−1) minutes before each meter. Note that n is a natural number and the unit is time.

  The determination unit 18 determines that there is no abnormality when the power amount difference rate calculated by the equation (5) is equal to or less than a predetermined value X [%]. X is set according to the characteristics of the target distribution system, and is a value that takes into account the distribution loss ratio and the like from the past operation results. For example, X can be 5%.

(effect)
According to the monitoring system 10 of the present embodiment, an error due to asynchronous information collection of each meter can be reduced by using the electric energy for a plurality of consecutive periods.

  Moreover, in the monitoring system 10 of this embodiment, since the electric energy addition period is at least 10 hours, preferably 10 to 20 hours, the occurrence of theft can be detected with high accuracy.

[Second Embodiment] (Considering distribution loss)
(Constitution)
FIG. 6 shows a partial configuration of a monitoring system according to the second embodiment of the present invention.
In the monitoring system 20 of the present embodiment, (1) consumers D and E (1-4, 1-5) are each connected to the low voltage distribution line 3, and are connected to one on the low voltage side of the pole transformer 4. (2) Meters 2-4 and 2-5 for measuring electric energy are respectively connected to the consumers D and E (1-4 and 1-5). It is characterized in that it is installed and (3) the monitoring device 15 ′ (see FIG. 7) is used as the monitoring device. Other than that, it is formed in the same manner as in the first embodiment. In the figure, Zd and Ze indicate the impedance [Ω] of the customer D-side distribution line 3 and the impedance of the customer E-side distribution line 3, respectively, and Zt indicates the impedance [Ω] of the pole transformer 4 Yes.

  As shown in FIG. 7, the monitoring device 15 ′ is configured in the same manner as the monitoring device 15 of FIG. 2 except that a distribution loss calculation unit 19 is provided between the collection unit 16 and the calculation unit 17. .

(Distribution loss calculator 19)
The distribution loss calculation unit 19 collects information such as voltage, current, active power, reactive power, and the like from the meters 2-4 and 2-5 of the consumers D and E (1-4, 1-5), and the low-voltage distribution system Estimate power distribution loss. Considering the estimated value of the power distribution loss, it becomes possible to determine the power theft with higher accuracy.

  As shown in FIG. 6, in the configuration in which power is distributed radially from the pole transformer 4 to each consumer, the poles are respectively determined from the information of the consumer meters 2-4 and 2-5 and the impedance information of the low-voltage distribution line 3. The low-voltage side voltage of the transformer 4 can be calculated. The calculated low-voltage side voltages should theoretically be the same, but the results are different due to the effects of errors. Therefore, the loss of the pole transformer 4 is calculated using the average value of each voltage as the voltage of the pole transformer 4.

  On the other hand, in estimating the distribution loss of the high-voltage distribution system, the voltage drop is overlapped with the estimated voltage (pole transformer end) including the error calculated in the estimation of the low-voltage distribution system, and the high-voltage distribution system end voltage is calculated. Furthermore, it is necessary to calculate the tidal current distribution of the high-voltage distribution line. In this case, it is affected by a larger error. As a result, it becomes a cause of erroneous determination (error detection of theft) in the difference calculation of the electric energy. Therefore, only the distribution loss of the low-voltage distribution system is reflected in the difference calculation.

(Function)
Hereinafter, an operation of determining theft by the monitoring system 20 will be described.
First, in the collection unit 16 of the monitoring device 15 ′, the voltage, current, and active power during the period from the meters 2-4 and 2-5 of the consumers D and E (1-4 and 1-5) at intervals of 30 minutes. Get the average reactive power. Next, the distribution loss calculation unit 19 calculates the pole transformer terminal voltage (Vz) and the distribution loss according to the following formulas (6) to (15) based on the collected information.

First, regarding the loss of the low-voltage distribution line 3 of the consumer D, the effective power loss Pzd [W] of the impedance (Zd) of the low-voltage distribution line 3 on the D side when the consumer D-side current is Id [A]. Is defined as equation (6),
Pzd = Re {Zd} × Id ² (6)
When the reactive power loss Qzd [W] of Zd is expressed by Equation (7),
Qzd = Im {Zd} × Id ² (7)
The pole transformer terminal voltage (calculated value of the consumer D starting point) Vzd can be expressed as in Expression (8).
Vzd = | Vmd + Zd × (Pmd / Vmd + jQmd / Vmd) ^* | (8)

  Here, Vmd is the voltage [V] of the consumer D, Pmd is the active power [W] of the consumer D, and Qmd is the reactive power [Var] of the consumer D.

On the other hand, regarding the loss of the low-voltage distribution line 3 of the customer E, the effective power loss Pze [W] of the impedance (Ze) of the low-voltage distribution line 3 on the E side when the current on the customer E side is Ie [A]. Is defined as equation (9),
Pze = Re {Ze} × Ie ² (9)
When the reactive power loss Qze [W] of Ze is expressed by Equation (10),
Qze = Im {Ze} × Ie ² (10)
The pole transformer terminal voltage (calculated value of the consumer E starting point) Vze can be expressed as in Expression (11).
Vze = | Vme + Ze × (Pme / Vme + jQme / Vme) ^* | (11)

  Here, Vme is the voltage [V] of the consumer E, Pme is the active power [W] of the consumer E, and Qme is the reactive power [Var] of the consumer E.

Due to the deviation of the measurement time zone due to the asynchronous collection of information of each meter, the calculated low voltage on the pole transformer end (calculated value of customer D starting point) Vzd and the low voltage on the pole transformer end (customer) (E calculated value of the starting point) Vze varies. For this reason, the distribution loss calculation part 19 assumes the low voltage side voltage Vz of a pole transformer end by the average of the calculated value of each consumer meter starting point like the following Formula (12).
Vz = (Vzd + Vze) × 0.5 (12)

If the pole transformer current (low voltage side) is It [A],
It = √ {(Pmd + Pme + Pzd + Pze) ² + (Qmd + Qme + Qzd + Qze) ² } / Vz (13)
Therefore, the effective power loss Ptz [W] of the pole transformer 4 can be expressed by the following equation (14) when the impedance of the pole transformer 4 is Zt [Ω].
Ptz = Re {Zt} × It ² (14)

Therefore, the distribution loss (estimated result) of the low-voltage distribution system (customer D and customer E) is expressed by the following equation (15).
30 minutes power loss [Wh] =
(Pzd + Pze + Ptz) × 1800/3600 (15)

  The distribution loss calculation unit 19 calculates the distribution loss in the target time zone (latest value, 30 minutes before, 60 minutes before ...) used for the calculation of the electric energy difference rate. A total power loss estimated value Wde_Loss of 1-5 is calculated.

Next, the calculating part 17 of monitoring apparatus 15 'calculates an electric energy difference rate by the following Formula (16).
Electricity difference rate [%] =
{Ws− (Wd + We) −Wde_Loss} / Ws × 100 (16)

  Here, Ws is the total power of the interconnection point (total power of continuous time) [Wh], Wd is the total power of consumer D (total power of continuous time) [Wh], and We is customer E. The total power amount (total power amount in continuous time) [Wh].

  Further, as in the first embodiment, the determination unit 18 of the monitoring device 15 ′ determines that there is no abnormality if the power amount difference rate calculated by the above equation (16) is equal to or less than a predetermined value X [%].

(effect)
According to the monitoring system 20 of the present embodiment, by using the loss of the low-voltage distribution system in the electric energy difference calculation, the determination can be made with a more detailed calculated electric energy value.

  In addition, according to the monitoring system 20 of the present embodiment, by assuming the pole transformer voltage as an average value of the calculation result of the voltage value, the voltage determination when a plurality of customers are arranged radially can be performed efficiently. It can be carried out.

[Other embodiments]
(1) In the first embodiment (FIG. 1), the consumers are A, B, and C, and in the second embodiment (FIG. 6), the consumers are D and E. The number can be arbitrary.

(2) Also in the first embodiment, the distribution loss calculation unit 19 is provided in the monitoring device 15, and an estimated value of the distribution loss is calculated by the method described in the second embodiment. Can be determined. In this case, if the distribution losses of consumers A, B, and C are Wa_Loss, Wb_Loss, and Wc_Loss, respectively,
Electric energy difference rate [%] = {Ws− (Wa + Wb + Wc)
− (Wa_Loss + Wb_Loss + Wc_Loss)} / Ws × 100
It can be expressed as.

  By reflecting the difference in power amount in consideration of the low-voltage distribution system loss, the total power amount of each consumer can be brought closer to the power amount at the interconnection point, and the determination of theft power can be made more accurately Can do.

(3) In the second embodiment, the pole transformer loss is calculated on the assumption that the average value is a positive value regarding the voltage variation of each consumer, but a representative value may be used instead of the average value. As the representative value, for example, the voltage value having the lowest voltage value among the voltage values by each consumer can be used. In this case, the pole transformer loss is calculated to be larger from the equations (13) and (14).

(4) In the first and second embodiments, as shown in FIG. 1, the connection point meter 12 is provided at the connection point with the upper system 14 in the high-voltage distribution line 11. An interconnection point meter 12 may be provided on the upper transformer 4 side. In this case, there is an advantage that no distribution loss occurs in the high-voltage distribution system.

(5) Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

1-1 ... Consumer A
1-2 ... Consumer B
1-3 ... Consumer C
1-4 ... Consumer D
1-5. Consumer E
2-1 ... Consumer A meter (customer measuring means)
2-2 ... Consumer B meter (customer measuring means)
2-3. Consumer C meter (customer measuring means)
2-4. Consumer D meter (customer measuring means)
2-5. Consumer E meter (customer measuring means)
3 ... Low voltage distribution line 4 ... Pole transformer 10 ... Monitoring system 11 ... High voltage distribution line 12 ... Link point meter (link point measuring means)
DESCRIPTION OF SYMBOLS 13 ... Distribution transformer 14 ... Host system 15, 15 '... Monitoring apparatus 16 ... Collection part 17 ... Calculation part 18 ... Determination part 19 ... Distribution loss calculation part

Claims (8)

A high-voltage distribution line connected to the upper system and receiving power supply from the power company;
A low-voltage distribution line that is stepped down from the high-voltage distribution line and supplies power to each consumer; and
Consumer measuring means for measuring the amount of power of each consumer,
Connected point measuring means that is provided on the higher system side than the customer measuring means and measures the amount of electric power at that position;
A monitoring device that detects theft based on the amount of power measured by the consumer measuring means and the connection point measuring means, and the monitoring device comprises:
A collection unit that collects the amount of power measured by the consumer measurement unit and the connection point measurement unit;
An arithmetic operation for calculating a difference ratio from the electric energy measured by the connection point measuring means, using the added electric energy for each consumer obtained by continuously adding the electric energy measured by the consumer measuring means for at least 10 hours. And
A power distribution system monitoring system comprising: a determination unit that determines power theft based on the calculation result.   The interconnecting point measuring means is provided at an interconnecting point interconnecting the upper system in the high-voltage distribution line, and the arithmetic unit is in all consumers of the added power amount measured by the consumer measuring means. 2. The distribution system monitoring system according to claim 1, wherein a difference ratio between the total electric energy and the electric energy at the interconnection point measured by the interconnection point measuring means is calculated.   The monitoring apparatus further includes a distribution loss calculation unit that estimates a distribution loss in the low-voltage distribution system by a predetermined calculation using information on voltage, current, active power, and reactive power collected from the consumer measurement unit. The distribution system monitoring system according to claim 1, wherein the distribution system is a monitoring system.   In the configuration in which each consumer is radially arranged on the low-voltage side of the pole transformer provided in the low-voltage distribution line, the distribution loss calculation unit, when estimating the distribution loss in the low-voltage distribution system, Based on the information from each customer measuring means, calculate the voltage at each pole starting transformer from each customer, and perform the calculation assuming the average value as the voltage value of the pole transformer. The power distribution system monitoring system according to claim 3. A collection unit that collects the amount of power measured by a consumer measurement unit that measures the amount of power of the consumer and a connection point measurement unit that is provided on the higher system side than the customer measurement unit;
An arithmetic operation for calculating a difference ratio from the electric energy measured by the connection point measuring means, using the added electric energy for each consumer obtained by continuously adding the electric energy measured by the consumer measuring means for at least 10 hours. And
A power distribution system monitoring device comprising: a determination unit that determines power theft based on the calculation result. The collecting unit collects the electric energy measured by a consumer measuring means for measuring the electric energy of the consumer and an interconnection point measuring means provided at a linkage point linked to the upper system in the high-voltage distribution line. ,
The said calculating part calculates the difference ratio of the total electric energy in all the consumers of the said additional electric energy, and the electric energy of the connection point measured by the said connection point measurement means, The calculation part characterized by the above-mentioned. Power distribution system monitoring equipment.   Furthermore, using the information on the voltage, current, active power and reactive power collected from the consumer measuring means, it has a distribution loss calculation unit for estimating a distribution loss in the low voltage distribution system by a predetermined calculation The distribution system monitoring apparatus according to claim 5 or 6.   When estimating the distribution loss in the low-voltage distribution system distributed to each customer arranged radially on the low-voltage side of the pole transformer provided in the low-voltage distribution line, the distribution loss calculation unit, Based on the information from each customer measuring means, calculate the voltage at each pole starting transformer from each customer, and perform the calculation assuming the average value as the voltage value of the pole transformer. 8. The distribution system monitoring apparatus according to claim 7,

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