CN106950440A - Transformer station's metering critical point quickly judges alarm method extremely - Google Patents

Abstract

It is that a kind of transformer station's metering critical point quickly judges alarm method extremely, it includes the first step the present invention relates to electric-power metering technical field, the electric quantity data in acquisition system database is extracted, second step formulates bus electric quantity balancing, line loss, the automatic calculation template of loss on transmission, 3rd step, target line metering critical point electric quantity data is calculated, the 4th step judges metering critical point with the presence or absence of abnormal, 5th step, alerted in time to keeper, the 6th step, the scene fortune timely defect elimination of inspection personnel.The present invention utilizes electricity report program system, day, which monitors, to be realized to transformer station's metering critical point of the whole network, abnormal metering critical point is searched in time and analysis advanced warning is carried out to abnormal critical point, be conducive to operation maintenance personnel on-call maintenance and realize accurate defect elimination, it is ensured that electric company's coulomb collection system gathers the accuracy of electric quantity data.

Description

Method for quickly judging and alarming abnormalities of substation metering gates

technical field

The invention relates to the technical field of electric power metering, and relates to a method for quickly judging and alarming abnormality of a substation metering gate.

Background technique

At present, whether the power data of the substation metering gateway is correct or not is related to whether the power settlement is correct or not, and whether it can truly reflect the line loss. The existing electric energy metering system does not have the abnormal alarm function of the substation metering gateway, and the manual labor does not have enough time and energy to read and analyze a large amount of data. At present, faults or errors occur at the metering gate of the substation first, and then manual analysis is carried out to solve the problem, which delays the discovery and treatment of the problem, and the measurement error of the electric energy meter at the metering gate will cause huge economic losses to both power supply parties. Affected by the maintenance or replacement of transformer equipment in the network, secondary equipment transformation, etc., transformers and metering circuits are prone to change, that is, changes are likely to occur between the terminals of voltage and current transformers and the meter terminals of the electroplating screen. To ensure The accuracy of the metering gate requires a method for quickly locating, judging and early warning when the metering gate is abnormal.

Contents of the invention

The present invention provides a method for quickly judging and alarming the abnormality of the metering gate of the substation, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem that the existing metering gate of the substation cannot timely alarm and notify the management personnel to eliminate the defect when there is a fault or error .

The technical solution of the present invention is achieved through the following measures: a method for quickly judging and alarming the abnormality of the substation metering gate, comprising the following steps:

The first step is to extract the power data in the database of the power collection system, and find out the measurement magnification, initial code and bottom code of the target line in the existing metering report database, and then enter the second step;

In the second step, according to the principle of "the active energy flowing into the bus is negative, and the active energy flowing out of the bus is positive" and the measurement characteristics of the metering device itself "positive and negative four quadrants of active energy and reactive energy", pre-define the marker active energy in the electricity report program system. The power is forward and reverse, and then enter the third step;

The third step is to calculate the template for automatic calculation of unbalanced power, line loss, and variable loss of the target line metering gateway busbar,

(a) Active power data at the metering gate, that is, active power = (bottom code - initial code) × magnification, (2) Calculate the change loss and loss rate based on the active power of two adjacent circuits, and change loss = (Forward active energy of the first line - reverse active energy of the first line) - (Forward active energy of the second line - reverse active energy of the second line), change loss rate = change loss / forward active energy of the first line ×100%;

(b) Calculate the unbalanced power of the bus and the unbalanced rate of the bus power based on the active power; Balance power/∑(reverse active power)×100%;

(c) Calculate the line loss power and line loss rate based on the active power. Line loss power = (forward active power of the first line + reverse active power of the second line) - (reverse active power of the first line + second Line loss rate = line loss power / (forward active power of the first line + reverse active power of the second line) × 100%, and then enter the fourth step;

The fourth step is to determine whether there is an abnormality at the metering gate. According to the power data obtained in the third step, determine the abnormality of the metering gate. If there is an abnormality, perform (1) or/and (2) or/and (3) or // and (4):

(1) According to the multiplied increase or decrease of the current transformer multiplier, it is obtained that the measurement multiplier is wrong, and then enter the fifth step;

(2) The substation meter has the function of positive and negative four-quadrant operation. Each phase corresponds to different metering conditions, that is, active power forward, active power reverse, reactive power forward, and reactive power reverse. If a quadrant does not correspond to In quadrant metering conditions, it can be immediately concluded that the polarity of the meter is reversed abnormally, and then enter the fifth step;

(3) Use the unbalanced power of the bus to determine the abnormality of the metering gate, and combine the remote measurement values of the phase voltage and phase current in the electric energy meter to determine whether the circuit is grounded or lack of phase, the voltage circuit is disconnected or the current circuit is shorted, and then enter the fifth step;

(4) If the meter running code has data but the meter runs slowly, and at the same time the voltage remote measurement is reduced or is zero, then it is determined that the circuit is grounded or a phase is missing; if the meter running code has no data, the disconnection voltage remote measurement is zero and the current If the circuit is short-circuited and the current remote measurement is zero, it is judged that the voltage circuit is disconnected or the current circuit is short-circuited, and then enter the fifth step;

If there is no abnormal situation at the metering gate, then enter the seventh step;

The fifth step is to alert the administrator in time, and according to the fourth step to determine the existence of different abnormal conditions at the metering gate, notify the administrator through the web page prompt alarm or send an alarm message to notify the on-site inspection personnel, and then enter the sixth step;

In the sixth step, the on-site inspection personnel eliminate the shortage in time, and deal with the fault points of the metering gate in time, and then enter the seventh step;

In the seventh step, if the metering gate is still abnormal, repeat the above steps; if the metering gate is normal, then end.

The present invention utilizes the electricity report program system to realize daily monitoring of the metering gates of substations in the entire network, find abnormal metering gates in time and analyze the abnormal gates in advance and give an alarm in advance. Accuracy of power data collected by the collection system.

Description of drawings

Accompanying drawing 1 is the method flowchart of embodiment 1 of the present invention.

Accompanying drawing 2 is the schematic diagram of the power balance of the busbar in Embodiment 2 of the present invention.

The numbers in the attached drawings are as follows: D1 is the metering gate of the Second West Line, D2 is the metering gate of the West Middle Line, D3 is the metering gate of the West Slope Line, D4 is the high side metering gate of No. 1 main transformer, and D5 is the high side metering of No. 2 main transformer pass.

detailed description

The present invention is not limited by the following examples, and specific implementation methods can be determined according to the technical solutions of the present invention and actual conditions.

In the present invention, for the convenience of description, the description of the relative positional relationship of each component is described according to the layout of Figure 1 of the specification, such as: the positional relationship of front, rear, top, bottom, left, right, etc. It is determined according to the layout direction of the drawings in the description.

Below in conjunction with embodiment and accompanying drawing, the present invention will be further described:

Embodiment 1: As shown in the accompanying drawing 1, the abnormal rapid judgment and alarm method of the substation metering gate includes the following steps:

The first step is to extract the power data in the database of the power collection system, and find out the measurement magnification, initial code and bottom code of the target line in the existing metering report database, and then enter the second step;

In the second step, according to the principle of "the active energy flowing into the bus is negative, and the active energy flowing out of the bus is positive" and the measurement characteristics of the metering device itself "positive and negative four quadrants of active energy and reactive energy", pre-define the marker active energy in the electricity report program system. The power is forward and reverse, and then enter the third step;

The third step is to calculate the template for automatic calculation of unbalanced power, line loss, and variable loss of the target line metering gateway busbar,

(a) Active power data at the metering gate, that is, active power = (bottom code - initial code) × magnification, (2) Calculate the change loss and loss rate based on the active power of two adjacent circuits, and change loss = (Forward active energy of the first line - reverse active energy of the first line) - (Forward active energy of the second line - reverse active energy of the second line), change loss rate = change loss / forward active energy of the first line ×100%;

(b) Calculate the unbalanced power of the bus and the unbalanced rate of the bus power based on the active power; Balance power/∑(reverse active power)×100%;

(c) Calculate the line loss power and line loss rate based on the active power. Line loss power = (forward active power of the first line + reverse active power of the second line) - (reverse active power of the first line + second Line loss rate = line loss power / (forward active power of the first line + reverse active power of the second line) × 100%, and then enter the fourth step;

The fourth step is to determine whether there is an abnormality at the metering gate. According to the power data obtained in the third step, determine the abnormality of the metering gate. If there is an abnormality, perform (1) or/and (2) or/and (3) or // and (4):

(1) According to the multiplied increase or decrease of the current transformer multiplier, it is obtained that the measurement multiplier is wrong, and then enter the fifth step;

(2) The substation meter has the function of positive and negative four-quadrant operation. Each phase corresponds to different metering conditions, that is, active power forward, active power reverse, reactive power forward, and reactive power reverse. If a quadrant does not correspond to In quadrant metering conditions, it can be immediately concluded that the polarity of the meter is reversed abnormally, and then enter the fifth step;

(3) Use the unbalanced power of the bus to determine the abnormality of the metering gate, and combine the remote measurement values of the phase voltage and phase current in the electric energy meter to determine whether the circuit is grounded or lack of phase, the voltage circuit is disconnected or the current circuit is shorted, and then enter the fifth step;

(4) If the meter running code has data but the meter runs slowly, and at the same time the voltage remote measurement is reduced or is zero, then it is determined that the circuit is grounded or a phase is missing; if the meter running code has no data, the disconnection voltage remote measurement is zero and the current If the circuit is short-circuited and the current remote measurement is zero, it is judged that the voltage circuit is disconnected or the current circuit is short-circuited, and then enter the fifth step;

If there is no abnormal situation at the metering gate, then enter the seventh step;

The fifth step is to alert the administrator in time, and according to the fourth step to determine the existence of different abnormal conditions at the metering gate, notify the administrator through the web page prompt alarm or send an alarm message to notify the on-site inspection personnel, and then enter the sixth step;

In the sixth step, the on-site inspection personnel eliminate the shortage in time, and deal with the fault points of the metering gate in time, and then enter the seventh step;

In the seventh step, if the metering gate is still abnormal, repeat the above steps; if the metering gate is normal, then end.

Both the power collection system database and the metering report database in the first step are known technologies and are the databases of the existing power grid system. It is convenient to extract the historical power data of the target line here.

Example 2: As shown in Figure 2, Table 1, Table 2, and Table 3, to calculate the power balance of the 110 kV western suburban substation and the 110 kV busbar, it is necessary to query the metering gate D1 of the second west line, the metering gate D2 of the west middle line, The initial code, bottom code and multiplier of the five metering gates of West Slope Line Metering Gate D3, No. 1 main transformer high-side metering gate D4, and No. The calculation is based on the principle that the active power is positive, that is, the power imbalance rate of the 110 kV bus in the western suburbs:

M%=[(D1+D3)－(D2+D4+D5)]÷(D1+D3)×100%

If M%>2%, it is determined that the bus power of this line is unbalanced, that is, there is an abnormal metering gate, and the abnormal metering gate is located by using the line loss or change loss of adjacent components.

Infer abnormal metering gates on the bus by calculating whether the line loss and main transformer loss are abnormal. 1. If the loss of one of the five metering gates of the high-side metering gate D5 of No. 2 main transformer is greater than 2%, the abnormal metering gates of D1 to D5 on the bus can be directly located; According to the principle of "positive power", if the power flowing into the bus is positive and the power flowing out of the bus is negative, then the on-site meter can be determined to be reversed. Due to the corresponding relationship between the metering gate magnification and the transformation ratio of the transformer connection, if the comprehensive magnification of the meter on the west slope line is 132000, then the metering transformation ratio of the transformer is 600:5. Since the transformation ratio of the transformer increases or decreases exponentially, the correct metering gate magnification can be determined from the transformation ratio of the transformer connection. If the reverse calculation of the bus level is qualified, then the measurement transformation ratio wiring of the localized field transformer is wrong. After judging the cause of the abnormality of the metering gate, the inspection personnel will be reminded through the webpage prompt alarm or SMS notification alarm, and then the inspection personnel will troubleshoot and deal with the fault of the metering gate.

The above technical features constitute the embodiment of the present invention, which has strong adaptability and implementation effect, and non-essential technical features can be increased or decreased according to actual needs to meet the needs of different situations.

Claims (1)

1. A kind of substation metering gateway abnormal fast judging alarm method, it is characterized in that comprising the following steps: The first step is to extract the power data in the database of the power collection system, and find out the measurement magnification, initial code and bottom code of the target line in the existing metering report database, and then enter the second step; In the second step, according to the principle of "the active energy flowing into the bus is negative, and the active energy flowing out of the bus is positive" and the measurement characteristics of the metering device itself "positive and negative four quadrants of active energy and reactive energy", pre-define the marker active energy in the electricity report program system. The power is forward and reverse, and then enter the third step; The third step is to calculate the template for automatic calculation of unbalanced power, line loss, and variable loss of the target line metering gateway busbar, (a) Active power data at the metering gate, that is, active power = (bottom code - initial code) × magnification, (2) Calculate the change loss and loss rate based on the active power of two adjacent circuits, and change loss = (Forward active energy of the first line - reverse active energy of the first line) - (Forward active energy of the second line - reverse active energy of the second line), change loss rate = change loss / forward active energy of the first line ×100%; (b) Calculate the unbalanced power of the bus and the unbalanced rate of the bus power based on the active power; Balance power/∑(reverse active power)×100%; (c) Calculate the line loss power and line loss rate based on the active power. Line loss power = (forward active power of the first line + reverse active power of the second line) - (reverse active power of the first line + second Line loss rate = line loss power / (forward active power of the first line + reverse active power of the second line) × 100%, and then enter the fourth step; The fourth step is to determine whether there is an abnormality at the metering gate. According to the power data obtained in the third step, determine the abnormality of the metering gate. If there is an abnormality, perform (1) or/and (2) or/and (3) or // and (4): (1) According to the multiplied increase or decrease of the current transformer multiplier, it is obtained that the measurement multiplier is wrong, and then enter the fifth step; (2) The substation meter has the function of positive and negative four-quadrant operation. Each phase corresponds to different metering conditions, that is, active power forward, active power reverse, reactive power forward, and reactive power reverse. If a quadrant does not correspond to In quadrant metering conditions, it can be immediately concluded that the polarity of the meter is reversed abnormally, and then enter the fifth step; (3) Use the unbalanced power of the bus to determine the abnormality of the metering gate, and combine the remote measurement values of the phase voltage and phase current in the electric energy meter to determine whether the circuit is grounded or lack of phase, the voltage circuit is disconnected or the current circuit is shorted, and then enter the fifth step; (4) If the meter running code has data but the meter runs slowly, and at the same time the voltage remote measurement is reduced or is zero, then it is determined that the circuit is grounded or a phase is missing; if the meter running code has no data, the disconnection voltage remote measurement is zero and the current If the circuit is short-circuited and the current remote measurement is zero, it is determined that the voltage circuit is disconnected or the current circuit is short-circuited, and then enter the fifth step; If there is no abnormal situation at the metering gate, then enter the seventh step; The fifth step is to alert the administrator in time, and according to the fourth step to determine the existence of different abnormal conditions at the metering gate, notify the administrator through the web page prompt alarm or send an alarm message to notify the on-site inspection personnel, and then enter the sixth step; In the sixth step, the on-site inspection personnel eliminate the shortage in time, and deal with the fault points of the metering gate in time, and then enter the seventh step; In the seventh step, if the metering gate is still abnormal, repeat the above steps; if the metering gate is normal, then end.