System for controlling the loss of commercial settlement energy meters of the main transformer in a coal-fired power plant, electronic device and computer-readable storage medium

Abstract

System for controlling the loss of trading billing energy meters of the main transformer in a coal-fired power plant, characterized in that it includes a special measuring voltage component, a special measuring current component and a component for energy measurement: wherein the special measuring voltage component is used to convert the 220 kV bus voltage into a secondary measuring voltage based on a preset voltage conversion ratio, and a control cable is used to transmit the secondary measuring voltage to the electrical energy measuring device; The special measuring current component serves to convert the primary current flowing through the high-voltage switch of the main transformer station into a secondary measuring current based on a predetermined current conversion ratio, and uses a control cable to transmit the secondary measuring current to the energy measuring device via a control cable; wherein the energy measuring device is used to receive the secondary measuring voltage and the secondary measuring current in order to perform the calculation of energy consumption, thereby determining the actual energy produced by the generator in the coal-fired power plant.

Description

[0001] The present invention relates to the field of loss control of energy meters in coal-fired power plants, mainly to a system for loss control of commercial billing energy meters of the main transformer.

[0002] With the deepening of electricity market reforms, coal-fired power plants are participating in the market as transaction units, and the grid-based electricity metering method is being changed from traditional line-gate metering to high-voltage-side metering of the unit's main transformer. This places higher demands on the accuracy of the energy metering equipment, particularly on the components of Class I and II electrical energy meters used for trade settlement, which is subject to strict regulations. However, the trade settlement system of the main transformer in traditional coal-fired power plants generally suffers from problems such as excessive voltage drop in the secondary metering voltage and excessive losses in the metering current. This results in a significantly lower amount of energy billed compared to the unit's actual electricity generation, seriously impacting the economic advantages of coal-fired power plants.

[0003] Currently, the secondary measuring voltage path of the energy meter component has a considerable length, and its secondary measuring voltage runs all the way from the switch cabinet of the 220 kV bus voltage transformer of the booster station to the operating box of the high-voltage circuit breaker of the main transformer of the relay room of the switching unit, and the secondary measuring voltage after switching is reconnected to the commercial billing energy meter for billing, with a path length of about 100 meters, which causes the secondary measuring voltage drop to exceed the range value specified in the regulations;Furthermore, there are many parallel loads in the middle, and the secondary measuring voltage loop of the commercial billing energy meter of the main transformer in the coal-fired power plant is usually connected in parallel with the load of the other main transformer or the starting transformer. The higher the load of the secondary circuit, the greater the total current and the voltage drop increases, and each load does not have an independent secondary measuring voltage loop of the PT power supply. At the same time, the cable loss is too high and the cross-sectional area of ​​the control line used in the secondary measuring voltage loop and the secondary measuring current loop is small, leading to an increase in the loss of the measuring voltage and measuring current.

[0004] As disclosed in the Chinese invention patent with publication number “CN108776252A”, a “measuring circuit for the secondary circuit of a main transformer” specifically discloses that “the secondary measuring current loop of the main transformer measures the measuring current of the secondary winding and the microcomputer protection measuring and control device by connecting the current loop of the electrical energy meter in series with the current transformer, thus realizing the measurement of the energy consumption of the high and low voltage loads of the main transformer while realizing the measurement of the load current of the main transformer”.However, this method results in the energy meter circuit being connected in series with the current transformer's measurement current connection path, meaning the same current transformer secondary side is required for both the energy meter and the protection and control unit. This increases the overall impedance of the circuit and may exceed the current transformer's rated load limit, thereby impairing the energy measurement accuracy. Furthermore, while this method "achieves the measurement of the energy consumption of the high and low voltage loads of the main transformer" through the same circuit, the load characteristics of the high and low voltage sides are different. This leads to load fluctuations on the low voltage side, directly affecting the accuracy of the trading settlement measurement on the high voltage side.

[0005] To solve the aforementioned problems, which exist in the prior art, this application provides a system for loss control of the trading settlement energy meter of the main transformer in coal-fired power plants.

[0006] The technical solutions of the present application are as follows: On the one hand, the invention proposes a system for loss control of the commercial billing energy meter of the main transformer in coal-fired power plants, comprising: a special voltage measuring component, a special current measuring component and a component for energy measurement: wherein the special measuring voltage component is used to convert the 220 kV bus voltage into a secondary measuring voltage based on a preset voltage conversion ratio, and adopts a control cable to transmit the secondary measuring voltage to the electrical energy measuring device;

[0007] The special measuring current component serves to convert the primary current flowing through the high-voltage switch of the main transformer station into a secondary measuring current based on a predetermined current conversion ratio, and uses a control cable to transmit the secondary measuring current to the energy measuring device via a control cable; wherein the energy measuring device is used to receive the secondary measuring voltage and the secondary measuring current in order to perform the calculation of energy consumption, thereby determining the actual energy produced by the generator in the coal-fired power plant.

[0008] Preferably, the special voltage measuring component comprises a special measuring voltage transformer and its secondary circuit component as well as a secondary voltage switching component; wherein the special measuring voltage transformer and its secondary circuit component transmit the secondary measuring voltage from the control cabinet of the voltage transformer to the secondary measuring voltage switching component, wherein the secondary measuring voltage switching component is installed in the same shielded cabinet as the electrical energy measuring device.

[0009] Preferably, the special measuring voltage transformer and its secondary circuit component comprise the control box of the 220 kV voltage transformer of the first and second buses; wherein the control box of the 220 kV voltage transformer of the first and second buses is connected to the secondary measuring voltage switching component via control cables.

[0010] Preferably, the secondary measuring voltage switching component comprises a DC power supply unit, a secondary measuring voltage switching unit and a position signal unit for the disconnect switches of the 220 kV bus, wherein: where the DC power supply unit is used to provide DC power to the secondary measuring voltage switching unit and the position signal unit for bus insulation meter switches; wherein the secondary measuring voltage switching unit is used to detect and switch the secondary measuring voltage from two channels of the 220 kV bus in the switch cabinet of the voltage transformer, and the secondary measuring voltage obtained after switching is output to the energy measuring device based on the position signal of the disconnect switches of the 220 kV bus; wherein the position signal of the 220 kV bus disconnect switches is used to distinguish between the high-voltage switch of the main transformer and the 220 kV bus disconnect switch, wherein the 220 kV bus disconnect switch comprises the first and second disconnect switches, and serves as the switching basis for the secondary measuring voltage switching unit;

[0011] It must be ensured that the first bus disconnect switch, the normally closed auxiliary contacts, and the second bus disconnect switch remain open under normal operating conditions, with the normally closed auxiliary contacts being installed inside the 220 kV main transformer switchgear of the special current measuring component; when the 220 kV main transformer is connected to the 220 kV first bus via the first bus disconnect switch, the first bus disconnect switch remains open while the normally closed auxiliary contacts are closed, so that the relay winding of the secondary measuring voltage switching unit is energized and the secondary measuring voltage of the first bus is detected;

[0012] When the 220 kV main transformer is connected to the second 220 kV bus via the second bus disconnect switch, the second bus disconnect switch remains open while the normally closed auxiliary contacts are switched, so that the relay winding of the secondary measuring voltage switching unit is energized and the secondary measuring voltage of the second bus is detected.

[0013] Preferably, the special current measuring component comprises a special measuring voltage transformer and its secondary circuit component, wherein the special measuring voltage transformer and its secondary circuit component comprise a 220 kV main transformer distribution cabinet, a special measuring current transformer for the 220 kV main transformers and a control cable with a predetermined cross-sectional area; the control cable is connected to the energy measuring component, wherein each neutral conductor of the control cable uses its own cable core.

[0014] Preferably, the energy measurement component comprises a commercial settlement electrometer, a unit for calculating the actual power generation, and a unit for error correction; The commercial billing energy meter is used to receive the secondary measuring voltage and the secondary measuring current; The unit for calculating actual electricity generation is used to calculate the actual electricity generation of the generator in the coal-fired power plant; The error correction unit calculates the voltage drops based on the resistance of the control cable and corrects the voltage deviation based on these voltage drops.

[0015] Preferably, the actual energy output of the generator in coal-fired power plants is determined, which is represented by the formula as follows: P=V2⋅I2⋅cosφ;

[0016] In the formula, P denotes the actual current generation of the generator; V2 stands for the secondary measuring voltage; I2 stands for the secondary measuring current; φ denotes the specified generation factor.

[0017] On the other hand, the present invention also proposes an electronic device according to claim 8.

[0018] Finally, the present invention proposes a computer-readable storage medium according to claim 9.

[0019] Compared to the prior art, the invention has the following advantageous effects: 1) This invention provides a system for loss control of the commercial billing energy meter of the main transformer in coal-fired power plants, adopting a separate special voltage measuring component and a special current measuring component to separate the acquisition, conversion and transmission of the voltage and current signals from the previous combined circuits, thereby avoiding signal interference and load superposition problems caused by sharing with other devices such as protection, measurement and control technology, thus improving the acquisition accuracy of the secondary measuring voltage and secondary measuring current; 2) This invention provides a system for loss control of the commercial billing energy meter of the main transformer in coal-fired power plants, wherein a control cable is used to transmit the secondary measuring voltage and current signals directly to the energy measuring devices, combined with the independent arrangement of special components, the line loss during the signal transmission process is reduced, thereby improving the integrity and stability of the signal transmission; 3) This invention provides a system for loss control of the trading billing energy meter of the main transformer in coal-fired power plants, and through the collaborative optimization design between the components, the coupling risk of the intermediate connection is reduced, thereby increasing the stability of the measuring system during long-term operation and its resistance to interference, as well as reducing the complexity of maintenance and the risk of data anomalies caused by complex circuits. Fig. Figure 1 shows the system architecture diagram of the embodiment of the present invention; Fig. Figure 2 shows the connection diagram of the special measuring voltage converter and its secondary circuit component of the embodiment of the present invention.

[0020] A specific embodiment of the present invention is described below to facilitate the understanding of the invention by engineers in this field; however, it should be clear that the present invention is not limited to the scope of the specific embodiments, and for the person skilled in the art in the field, as long as various changes in the mind and scope of the invention are limited and defined by the attached claims, these changes are obvious, and all inventions and creations utilizing the present invention are protected.

[0021] The present invention offers the following technical solution: a system for loss control of commercial billing energy meters of the main transformer in coal-fired power plants. Example 1

[0022] Specifically with reference to Fig. 1 The embodiment provides a system for loss control of the trading billing energy meter of the main transformer in coal-fired power plants, the specific steps comprising: a special voltage measuring component, a special current measuring component and a component for the energy measuring devices: In the present embodiment, the coal-fired power plant comprises a 220 kV bus, wherein the 220 kV bus includes a first 220 kV bus, a second 220 kV bus, a first bus disconnect switch 22011, a second bus disconnect switch 22012, a 220 kV disconnect switch for the main transformer 2201, a bus-side earth disconnect switch 220117, a 220 kV current transformer for measuring the main transformer, a main-side earth disconnect switch 220167, a first 220 kV bus voltage transformer, a bus-side earth disconnect switch 2117, a second 220 kV bus voltage transformer, a 220 kV bus voltage transformer disconnect switch 219, and comprising a secondary-side earthing disconnect switch 2197, a main transformer neutral earthing disconnect switch 210, a generator neutral earthing disconnect switch 201 and a generator neutral earthing disconnect transformer;

[0023] The model that uses the control cable is ZCN-KVVP22 \8 * 6MM 2 450 / 750V; S1. The special voltage measurement component is used to convert the 220 kV bus voltage into a secondary measurement voltage of 100 V based on a preset voltage conversion ratio, and adopts a control cable to transmit the secondary measurement voltage to the electrical energy measurement device;

[0024] The special voltage measuring component comprises a special measuring voltage transformer and its secondary circuit component as well as a secondary voltage switching component; wherein the special measuring voltage transformer and its secondary circuit component transmit the secondary measuring voltage from the control cabinet of the measuring voltage transformer to the secondary measuring voltage switching component, wherein the secondary measuring voltage switching component is installed in the same shielded cabinet as the electrical energy measuring device.

[0025] In the present embodiment, the specified voltage conversion ratio is 220kV / 100V;

[0026] S11. See Fig. 2, the special measuring voltage transformer and its secondary circuit component comprise the control box of the 220 kV voltage transformer of the first and second buses; wherein the control box of the 220 kV voltage transformer of the first and second buses is connected to the secondary measuring voltage switching component via control cables.

[0027] The voltage drop of the special measuring voltage converter and its secondary circuits is less than 0.2% of the nominal secondary measuring voltage; the cross-sectional area of ​​the control cables is 6 mm². 2 , and the control cable with a cross-sectional area of ​​2.5 mm² 2is eliminated, which further reduces the voltage drop of the secondary measuring voltage, so that the secondary measuring voltage of the commercial billing energy meter of the main transformer is infinitely close to the nominal voltage value of 100V;

[0028] S12. The secondary measuring voltage switching component comprises a 110 V DC power supply unit, a secondary measuring voltage switching unit and a position signal unit for the disconnect switches of the 220 kV bus, wherein: The DC power supply unit provides direct current to the control unit of the secondary measuring voltage switching unit and the position signal unit for the bus disconnect switch; when the L+L air switch of the 110V DC power supply unit is switched on, L+L- represents the symbol for the air switch; the switching unit of the secondary measuring voltage begins to operate normally while the signal current supply required by the signal unit at the position of the 220kV bus disconnect switch is provided; wherein the secondary measuring voltage switching unit is used to detect and switch the secondary measuring voltage from two channels of the 220 kV bus in the switch cabinet of the voltage transformer, and the secondary measuring voltage obtained after switching is output to the energy measuring device based on the position signal of the disconnect switches of the 220 kV bus; wherein the position signal of the 220 kV bus disconnect switches is used to distinguish between the high-voltage switch of the main transformer and the 220 kV bus disconnect switch, wherein the 220 kV bus disconnect switch comprises the first and second disconnect switches, and serves as the switching basis for the secondary measuring voltage switching unit;

[0029] It must be ensured that the first bus disconnect switch, the normally closed auxiliary contacts, and the second bus disconnect switch remain open under normal operating conditions, with the normally closed auxiliary contacts installed inside the 220 kV main transformer switchgear of the special current measuring component; when the 220 kV main transformer is connected to the 220 kV first bus via the first bus disconnect switch, the first bus disconnect switch remains open while the normally closed auxiliary contacts are closed, so that the relay winding 1YQJ of the secondary measuring voltage switching unit CZX-12GN-Q is energized and the secondary measuring voltage of the first bus is detected;

[0030] When the 220 kV main transformer is connected to the second 220 kV bus via the second bus disconnect switch, the second bus disconnect switch remains open while the normally closed auxiliary contacts are switched, so that the relay winding 2 YQJ of the secondary measuring voltage switching unit CZX-12GN-Q is energized to detect the secondary measuring voltage of the second bus.

[0031] S2. The special current measuring component serves to convert the primary current flowing through the high-voltage switch of the main transformer station into a secondary measuring current based on a predetermined current conversion ratio, and uses a control cable to transmit the secondary measuring current to the energy measuring device via a control cable;

[0032] In the present embodiment, the specified current conversion ratio is 1500 / 1A;

[0033] The special current measurement component comprises a special measurement voltage transformer and its secondary circuit component, wherein the special measurement voltage transformer and its secondary circuit component comprise a 220 kV main transformer distribution cabinet, a special measurement current transformer for the 220 kV main transformers and a control cable with a predetermined cross-sectional area; the control cable is connected to the energy measurement component, wherein each neutral conductor of the control cable uses its own cable core.

[0034] In the present embodiment, the number of separate cable cores used is 8, and one cable core is shared instead of the three-phase neutral conductor;

[0035] S3. The energy measurement component is used to receive the secondary measurement voltage and the secondary measurement current in order to perform the calculation of energy consumption;

[0036] The component for the energy metering device includes a commercial billing energy meter, a unit for calculating the actual electricity generation, and a unit for error correction; The commercial billing energy meter is used to receive the secondary measuring voltage and the secondary measuring current; The unit for calculating actual electricity generation is used to calculate the actual electricity generation of the generator in the coal-fired power plant;

[0037] The error correction unit calculates the voltage drop based on the resistance of the control cable and corrects the voltage deviation based on the voltage drop;

[0038] The actual electricity generation of the generator in a coal-fired power plant is determined and represented by the following formula: P=V2⋅I2⋅cosφ;

[0039] In the formula, P denotes the actual current generation of the generator; V2 stands for the secondary measuring voltage; I2 stands for the secondary measuring current; φ denotes the specified generation factor. Example 2

[0040] The present embodiment allows for the control of the loss of a commercial billing energy meter of a main transformer in a coal-fired power plant, comprising: The 220 kV bus voltage is obtained, which is converted into the secondary measuring voltage based on the specified voltage conversion ratio; simultaneously, the primary current flowing through the high-voltage switch of the main transformer station is converted into the secondary measuring current based on the specified current conversion ratio; and a control cable is used to transmit the secondary measuring voltage and secondary measuring current to the commercial settlement electrometers.

[0041] The trading settlement electrometer receives the secondary measuring voltage and the secondary measuring current to calculate the energy in order to determine the actual power generation of the generator in the coal-fired power plant;

[0042] Loss control of the trading settlement electrometer is based on the actual electricity generation. Example 3

[0043] The present embodiment also proposes an electronic device comprising a memory, a processor and a computer program stored in memory and running on the processor, wherein the processor, when executing the program, implements a control of the loss of commercial billing energy meter of the main transformer in a coal-fired power plant according to one of the embodiments of the present invention. Example 4

[0044] The present embodiment proposes a computer-readable storage medium which has stored a computer program, wherein the program, when executed by the processor, implements a control of the loss of commercial billing energy meter of the main transformer in a coal-fired power plant according to one of the embodiments of the present invention.

[0045] It should be noted that the system, electronic device and computer-readable storage medium described in the present invention are based on the same principle as embodiment 1 and are not repeated herein.

[0046] The above is only one embodiment of the present invention and therefore does not limit the scope of the patent. All equivalent structures or equivalent process modifications made using the content of the description and figures of the present invention, or which are applied directly or indirectly to other related technical fields, also fall within the scope of patent protection of the present invention. Reference symbol list 22011 first bus disconnect switch 22012 second bus disconnect switch 2201 Main transformer 220117 Earthing disconnect switch on the bus side 220167 Earthing disconnect switch on the main transformer side 2117 Earthing disconnect switch on the bus side 219 Bus voltage converter 2197 Earthing disconnect switch on the secondary side 210 Star point earthing disconnect switch of the main transformer 201 Star point earthing disconnect switch of the generator QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] CN 108776252A

[0004]

Claims

[1] System for controlling the loss of trading settlement energy meter of the main transformer in a coal-fired power plant, characterized by , that it includes a special measuring voltage component, a special measuring current component and a component for energy measurement: wherein the special measuring voltage component is used to convert the 220 kV bus voltage into a secondary measuring voltage based on a preset voltage conversion ratio, and a control cable is used to transmit the secondary measuring voltage to the electrical energy measuring device; The special measuring current component serves to convert the primary current flowing through the high-voltage switch of the main transformer station into a secondary measuring current based on a predetermined current conversion ratio, and uses a control cable to transmit the secondary measuring current to the energy measuring device via a control cable; wherein the energy measuring device is used to receive the secondary measuring voltage and the secondary measuring current in order to perform the calculation of energy consumption, thereby determining the actual energy produced by the generator in the coal-fired power plant. [2] System for controlling the loss of the trading settlement energy meter of the main transformer in a coal-fired power plant according to claim 1, characterized by , that the special measuring voltage component comprises a special measuring voltage transformer and its secondary circuit component as well as a secondary voltage switching component; wherein the special measuring voltage transformer and its secondary circuit component transmit the secondary measuring voltage from the control cabinet of the measuring voltage transformer to the secondary measuring voltage switching component, wherein the secondary measuring voltage switching component is installed in the same shielded cabinet as the electrical energy measuring device. [3] System for controlling the loss of the trading settlement energy meter of the main transformer in a coal-fired power plant according to claim 2, characterized by , that the special measuring voltage transformer and its secondary circuit component comprise the control box of the 220 kV voltage transformer of the first and second buses; wherein the control box of the 220 kV voltage transformer of the first and second buses is connected to the secondary measuring voltage switching component via control cables. [4] System for controlling the loss of trading settlement energy meters of the main transformer in a coal-fired power plant according to claim 2 or 3, characterized by , that the secondary measuring voltage switching component comprises a DC power supply unit, a secondary measuring voltage switching unit and a position signal unit of the disconnectors of the 220 kV bus, wherein: where the DC power supply unit is used to provide DC power to the secondary measuring voltage switching unit and the position signal unit for bus insulation meter switches; wherein the secondary measuring voltage switching unit is used to detect and switch the secondary measuring voltage from two channels of the 220 kV bus in the switch cabinet of the voltage transformer, and the secondary measuring voltage obtained after switching is output to the energy measuring device based on the position signal of the disconnect switches of the 220 kV bus; wherein the position signal of the 220 kV bus disconnect switches is used to distinguish between the high-voltage switch of the main transformer and the 220 kV bus disconnect switch, wherein the 220 kV bus disconnect switch comprises the first and second disconnect switches, and serves as the switching basis for the secondary measuring voltage switching unit; It must be ensured that the first bus disconnect switch, the normally closed auxiliary contacts, and the second bus disconnect switch remain open under normal operating conditions, with the normally closed auxiliary contacts being installed inside the 220 kV main transformer switchgear cabinet of the special current measuring component; when the 220 kV main transformer is connected to the 220 kV first bus via the first bus disconnect switch, the first bus disconnect switch remains open while the normally closed auxiliary contacts are closed, so that the relay winding of the secondary measuring voltage switching unit is energized and the secondary measuring voltage of the first bus is detected; When the 220 kV main transformer is connected to the second 220 kV bus via the second bus disconnect switch, the second bus disconnect switch remains open while the normally closed auxiliary contacts are switched, so that the relay winding of the secondary measuring voltage switching unit is energized and the secondary measuring voltage of the second bus is detected. [5] System for controlling the loss of the trading settlement energy meter of the main transformer in a coal-fired power plant according to claim 1, characterized by, that the special current measuring component comprises a special measuring voltage transformer and its secondary circuit component, wherein the special voltage transformer and its secondary circuit component comprise a 220 kV main transformer distribution cabinet, a special measuring current transformer for the 220 kV main transformers and a control cable with a specified cross-sectional area; the control cable is connected to the energy measuring component, wherein each neutral conductor of the control cable uses its own cable core. [6] System for controlling the loss of the trading settlement energy meter of the main transformer in a coal-fired power plant according to claim 1, characterized by , that the energy metering component includes a commercial billing energy meter, a unit for calculating actual electricity generation and a unit for error correction; The commercial billing energy meter is used to receive the secondary measuring voltage and the secondary measuring current; The unit for calculating actual electricity generation is used to calculate the actual electricity generation of the generator in the coal-fired power plant; The error correction unit calculates the voltage drops based on the resistance of the control cable and corrects the voltage deviation based on these voltage drops. [7] System for controlling the loss of the trading settlement energy meter of the main transformer in a coal-fired power plant according to claim 1, characterized by , that the actual electricity generation of the generator in a coal-fired power plant is represented by the formula: P=V2⋅I2⋅cosφ; In the formula, P denotes the actual current generation of the generator; V2 stands for the secondary measuring voltage; I2 stands for the secondary measuring current; φ denotes the specified generation factor. [8] Electronic device comprising a memory, a processor and a computer program stored in memory and running on the processor, characterized by , that when the processor executes the program, it implements the following steps to control the loss of trading settlement energy meter of the main transformer in a coal-fired power plant: The 220 kV bus voltage is obtained and converted into the secondary measuring voltage based on the specified voltage conversion ratio; simultaneously, the primary current flowing through the high-voltage switch of the main transformer station is converted into the secondary measuring current based on the specified current conversion ratio; and a control cable is used to transmit the secondary measuring voltage and secondary measuring current to the commercial settlement electrometers; wherein The trading settlement electrometer receives the secondary measuring voltage and the secondary measuring current to calculate the energy in order to determine the actual power generation of the generator in the coal-fired power plant; Loss control of the trading settlement electrometer is based on the actual electricity generation. [9] Computer-readable storage medium that has stored a computer program, characterized by, that the program, when executed by the processor, implements the following steps to control the loss of trading settlement energy meter of the main transformer in a coal-fired power plant: The 220 kV bus voltage is obtained and converted into the secondary measuring voltage based on the specified voltage conversion ratio; simultaneously, the primary current flowing through the high-voltage switch of the main transformer station is converted into the secondary measuring current based on the specified current conversion ratio; and a control cable is used to transmit the secondary measuring voltage and secondary measuring current to the commercial settlement electrometers; wherein The trading settlement electrometer receives the secondary measuring voltage and the secondary measuring current to calculate the energy in order to determine the actual power generation of the generator in the coal-fired power plant; Loss control of the trading settlement electrometer is based on the actual electricity generation.

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