Thermal power plant main transformer trade settlement electric energy meter loss control system and method

Abstract

The invention relates to a thermal power plant main transformer trade settlement electric energy meter loss control system and method, and the system comprises the following steps: a special metering voltage assembly is used for converting a 220kV bus voltage into a secondary metering voltage based on a preset voltage conversion proportion; the secondary metering voltage is transmitted to the electric energy metering device assembly by using a control cable; the special metering current assembly is used for converting primary current flowing through a main transformer high-voltage circuit breaker into secondary metering current based on a preset current conversion proportion, and transmitting the secondary metering current to the electric energy metering device assembly by using a control cable; and the electric energy metering device assembly is used for receiving the secondary metering voltage and the secondary metering current for electric energy calculation to obtain the actual generating capacity of the generator in the thermal power plant.

Description

Technical Field

[0001] This application relates to the field of power loss of electric energy meters in thermal power plants, and mainly relates to a control system and method for the power loss of the main transformer trade settlement electric energy meter in a thermal power plant. Background Art

[0002] With the deepening of the power market reform, coal-fired power plants participate in the power market with units as trading units. The metering method of the on-grid electricity quantity is adjusted from the traditional line checkpoint meter metering to the metering of the high-voltage side of the unit main transformer. This adjustment puts forward higher requirements for the accuracy of the components of the electric energy metering device, especially for the Class I and Class II electric energy metering device components for trade settlement, which need to strictly follow the regulations. However, in the traditional main transformer trade settlement electric energy metering system of thermal power plants, there are generally problems such as excessive secondary metering voltage drop and excessive metering current loss, resulting in the settlement electricity quantity being significantly lower than the actual generated electricity quantity of the unit, seriously affecting the economic benefits of thermal power plants.

[0003] At present, the path of the secondary metering voltage circuit of the electric energy metering device components is relatively long. Its secondary metering voltage is led from the control cabinet of the 220 kV bus voltage transformer in the booster station to the operation box of the main transformer high-voltage circuit breaker in the unit relay room for switching, and the switched secondary metering voltage is connected to the trade settlement electric energy meter again for settlement. The path length is about 100 meters, resulting in the secondary metering voltage drop exceeding the range value specified in the regulations; in addition, there are many parallel loads in the middle. The secondary metering voltage circuit of the main transformer trade calculation electric energy meter in a thermal power plant is usually connected in parallel with the loads of other main transformers or start-up standby transformers. The more loads in the secondary circuit, the greater the total current and the greater the voltage drop. Each load does not use an independent PT to supply the secondary metering voltage circuit; at the same time, the cable loss is too large. The control cables used in the secondary metering voltage circuit and the secondary metering current circuit have relatively small cross-sectional areas, resulting in an increase in the loss of metering voltage and current.

[0004] For example, the Chinese invention patent with the publication number "CN108776252A" discloses a "Measuring Secondary Current Circuit of Main Transformer", which specifically discloses that "the measuring secondary current circuit of this main transformer realizes the measurement of the high and low voltage load energy consumption of the main transformer while realizing the measurement of the load current of the main transformer by connecting the current circuit of the electric energy meter in series to the measuring secondary winding of the current transformer and the measuring current wiring circuit of the microcomputer protection and measurement and control device", but this method connects the current circuit of the electric energy meter in series to the measuring secondary winding of the current transformer and the measuring current wiring circuit of the microcomputer protection and measurement and control device, resulting in the need to supply power to both the electric energy meter and the protection and measurement and control device simultaneously on the secondary side of the same current transformer, which will increase the total impedance of the circuit, may exceed the rated load range of the current transformer, and affect the accuracy of electric energy metering; in addition, this method "realizes the measurement of the high and low voltage load energy consumption of the main transformer" through the same circuit, but the load characteristics on the high and low voltage sides are different, resulting in the direct impact of the load fluctuation on the low voltage side on the accuracy of the high voltage side trade settlement metering. Summary of the Invention

[0005] To solve the above problems existing in the prior art, the present application provides a loss control system and method for the main transformer trade settlement watt-hour meter in a thermal power plant.

[0006] The technical solution of the present application is as follows:

[0007] On the one hand, the present invention proposes a loss control system for the main transformer trade settlement watt-hour meter in a thermal power plant, including: a metering dedicated voltage component, a metering dedicated current component, and an electric energy metering device component:

[0008] The metering dedicated voltage component is used to convert the 220 kV bus voltage into a secondary metering voltage based on a preset voltage conversion ratio, and transmit the secondary metering voltage to the electric energy metering device component by using a control cable;

[0009] The metering dedicated current component is used to convert the primary current flowing through the main transformer high-voltage circuit breaker into a secondary metering current based on a preset current conversion ratio, and transmit the secondary metering current to the electric energy metering device component by using a control cable;

[0010] The electric energy metering device component is used to receive the secondary metering voltage and the secondary metering current for electric energy calculation to obtain the actual power generation of the generator in the thermal power plant.

[0011] Preferably, the metering dedicated voltage component includes a metering dedicated voltage transformer and its secondary circuit component and a secondary metering voltage switching component; the metering dedicated voltage transformer and its secondary circuit component transmit the secondary metering voltage from the voltage transformer control cabinet to the secondary metering voltage switching component, wherein the secondary metering voltage switching component and the electric energy metering device component are installed in the same switch cabinet.

[0012] Preferably, the metering dedicated voltage transformer and its secondary circuit component include a 220 kV first bus voltage transformer control cabinet and a 220 kV second bus voltage transformer control cabinet; the 220 kV first bus voltage transformer control cabinet and the 220 kV second bus voltage transformer control cabinet are connected to the secondary metering voltage switching component through a control cable.

[0013] Preferably, the secondary metering voltage switching component includes a DC power supply unit, a secondary metering voltage switching device unit, and a 220 kV bus disconnector position signal unit, wherein:

[0014] The DC power supply unit is used to provide a DC control power supply for the secondary metering voltage switching device unit and the bus disconnector position signal unit;

[0015] The secondary metering voltage switching device unit is used to collect and switch the secondary metering voltages of two paths of the 220 kV bus in the voltage transformer control cabinet, and based on the position signals of the 220 kV bus isolating switches, output the switched secondary metering voltages to the electric energy metering device assembly;

[0016] The 220 kV bus isolating switch position signal unit is used to discriminate the connection isolating switches between the main transformer high-voltage circuit breaker and the 220 kV bus. The connection isolating switches of the 220 kV bus include the first bus isolating switch and the second bus isolating switch, and provide a basis for metering voltage switching for the secondary metering voltage switching device unit;

[0017] Keep the first bus isolating switch, the normally closed auxiliary contact, and the second bus isolating switch open. The normally closed auxiliary contact is installed in the 220 kV main transformer control cabinet of the metering dedicated current assembly; when the 220 kV main transformer is connected to the 220 kV first bus through the first bus isolating switch, the first bus isolating switch is open, the normally closed auxiliary contact flips, the relay coil inside the secondary metering voltage switching device unit is energized, and the secondary metering voltage of the first bus is collected;

[0018] When the 220 kV main transformer is connected to the 220 kV second bus through the second bus isolating switch, the second bus isolating switch is open, the normally closed auxiliary contact flips, the relay coil inside the secondary metering voltage switching device unit is energized, and the secondary metering voltage of the second bus is collected.

[0019] Preferably, the metering dedicated current assembly includes a metering dedicated voltage transformer and its secondary circuit assembly. The metering dedicated voltage transformer and its secondary circuit assembly include a 220 kV main transformer control cabinet, a 220 kV main transformer metering dedicated current transformer, and a control cable with a preset cross-sectional area; it is connected to the electric energy metering device assembly through a control cable with a preset cross-sectional area, and each neutral line of the control cable uses a separate cable core.

[0020] Preferably, the electric energy metering device assembly includes a trade settlement electric energy meter, an actual power generation calculation unit, and an error correction unit;

[0021] The trade settlement electric energy meter is used to receive the secondary metering voltage and the secondary metering current;

[0022] The actual power generation calculation unit is used to calculate the actual power generation of the generator in the thermal power plant;

[0023] 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.

[0024] Preferably, the actual power generation of the generator in the thermal power plant is obtained, and is expressed by the formula:

[0025]

[0026] Wherein, P represents the actual power generation of the generator; V2 represents the secondary metering voltage; I2 represents the secondary metering current; represents a preset power generation factor.

[0027] On the other hand, the present invention also provides a method for controlling the loss of the main transformer trade settlement watt-hour meter in a thermal power plant, and the method includes:

[0028] Obtain the 220 kV bus voltage, convert it to the secondary metering voltage based on a preset voltage conversion ratio, and convert the primary current flowing through the main transformer high-voltage circuit breaker to the secondary metering current based on a preset current conversion ratio; and use a control cable to transmit the secondary metering voltage and the secondary metering current to the trade settlement watt-hour meter;

[0029] The trade settlement watt-hour meter receives the secondary metering voltage and the secondary metering current for power calculation to obtain the actual power generation of the generator in the thermal power plant;

[0030] Control the loss of the trade settlement watt-hour meter based on the actual power generation of the generator.

[0031] On yet another aspect, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements a method for controlling the loss of the main transformer trade settlement watt-hour meter in a thermal power plant according to any embodiment of the present invention.

[0032] On yet another aspect, the present invention also provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, it implements a method for controlling the loss of the main transformer trade settlement watt-hour meter in a thermal power plant according to any embodiment of the present invention.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] 1) The present invention provides a system and method for controlling the loss of the main transformer trade settlement watt-hour meter in a thermal power plant. By using independent metering dedicated voltage components and current components, the processes of collecting, converting, and transmitting voltage and current signals are separated from the original composite circuit, avoiding signal interference and load superposition problems caused by sharing circuits with other devices such as protection and measurement and control, and improving the collection accuracy of secondary metering voltage and current;

[0035] 2) The present invention provides a system and method for controlling the loss of the main transformer trade settlement watt-hour meter in a thermal power plant. By directly transmitting the secondary metering voltage and current signals to the power metering device components using a control cable and combining the independent layout of the dedicated components, the line loss during the signal transmission process is reduced, and the integrity and stability of the signal transmission are improved;

[0036] 3) The present invention provides a loss control system and method for the main transformer trade settlement watt-hour meter in a thermal power plant. Through the collaborative optimization design among components, the coupling risk in the intermediate links is reduced, the stability and anti-interference ability of the metering system during long-term operation are improved, and the maintenance difficulty and data anomaly risk caused by the complex circuit are reduced. Description of the Drawings

[0037] Figure 1 is the system architecture diagram of an embodiment of the present invention;

[0038] Figure 2 is the wiring schematic diagram of the metering special voltage transformer and its secondary circuit components in an embodiment of the present invention. Detailed Embodiments

[0039] The following describes the detailed embodiments of the present invention to facilitate those skilled in the art of the present technology to understand the present invention. However, it should be clear that the present invention is not limited to the scope of the detailed embodiments. For those of ordinary skill in the art of the present technology, as long as various changes are within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are within the scope of protection.

[0040] The present invention provides the following technical solutions: a loss control system and method for the main transformer trade settlement watt-hour meter in a thermal power plant.

[0041] Embodiment 1

[0042] Specifically refer to Figure 1 , this embodiment provides a loss control system for the main transformer trade settlement watt-hour meter in a thermal power plant. The specific steps include: a metering special voltage component, a metering special current component, and an electric energy metering device component:

[0043] In this embodiment, the thermal power plant includes a 220 kV bus, where the 220 kV bus includes a 220 kV first bus, a 220 kV second bus, a first bus disconnecting switch 22011, a second bus disconnecting switch 22012, a 220 kV main transformer circuit breaker 2201, a bus-side earthing switch 220117, a 220 kV main transformer metering current transformer, a main transformer-side earthing switch 220167, a 220 kV first bus voltage transformer, a 220 kV bus voltage transformer bus-side earthing switch 2117, a 220 kV second bus voltage transformer, a 220 kV bus voltage transformer isolating switch 219, a 220 kV bus voltage transformer side earthing switch 2197, a main transformer neutral earthing switch 210, a generator neutral earthing switch 201, and a generator neutral earthing transformer;

[0044] The model of the control cable adopted is ZCN-KVVP22\8*6MM2 450 / 750V;

[0045] S1. The dedicated metering voltage component is used to convert the 220 kV bus voltage into a secondary metering voltage of 100 V based on a preset voltage conversion ratio, and transmit the secondary metering voltage to the electric energy metering device component through a control cable;

[0046] The dedicated metering voltage component includes a dedicated metering voltage transformer, its secondary circuit component, and a secondary metering voltage switching component; the dedicated metering voltage transformer and its secondary circuit component transmit the secondary metering voltage from the voltage transformer control cabinet to the secondary metering voltage switching component, where the secondary metering voltage switching component and the electric energy metering device component are installed in the same switch cabinet;

[0047] In this embodiment, the preset voltage conversion ratio is 220 kV / 100 V;

[0048] S11. Please refer to Figure 2 , the dedicated metering voltage transformer and its secondary circuit component include a 220 kV first bus voltage transformer control cabinet and a 220 kV second bus voltage transformer control cabinet; the 220 kV first bus voltage transformer control cabinet and the 220 kV second bus voltage transformer control cabinet are connected to the secondary metering voltage switching component through a control cable;

[0049] Among them, the voltage drop of the dedicated metering voltage transformer and its secondary circuit is less than 0.2% of the rated secondary metering voltage; the cross-sectional area of the control cable is 6 MM 2 , cancel the control cable with a cross-sectional area of 2.5 mm 2 , further reducing the voltage drop of the secondary metering voltage, making the secondary metering voltage value of the main transformer's trade settlement watt-hour meter infinitely close to the rated voltage value of 100 V;

[0050] S12. The secondary metering voltage switching component includes an 110 V DC power supply unit, a secondary metering voltage switching device unit, and a 220 kV bus disconnector position signal unit, where:

[0051] The DC power supply unit is used to provide a DC control power supply for the secondary metering voltage switching device unit and the bus disconnector position signal unit; when the L+L− breaker of the 110 V DC power supply unit is switched on, where L+L− represents the breaker symbol; the secondary metering voltage switching device unit starts to operate normally, and at this time, the signal power required by the 220 kV bus disconnector position signal unit is satisfied;

[0052] The secondary metering voltage switching device unit is used to collect and switch the secondary metering voltages of two paths of the 220 kV bus in the voltage transformer control cabinet, and based on the position signals of the 220 kV bus isolating switches, output the switched secondary metering voltages to the electric energy metering device assembly;

[0053] The 220 kV bus isolating switch position signal unit is used to discriminate the connection isolating switches between the main transformer high-voltage circuit breaker and the 220 kV bus. The connection isolating switches of the 220 kV bus include the first bus isolating switch and the second bus isolating switch, and provide a metering voltage switching basis for the secondary metering voltage switching device unit;

[0054] Keep the first bus isolating switch, the normally closed auxiliary contact and the second bus isolating switch open. The normally closed auxiliary contact is installed in the 220 kV main transformer control cabinet of the metering dedicated current assembly; when the 220 kV main transformer is connected to the 220 kV first bus through the first bus isolating switch, the first bus isolating switch is open, the normally closed auxiliary contact flips, and the coil of the 1YQJ relay inside the secondary metering voltage switching device unit CZX-12GN-Q is energized to collect the secondary metering voltage of the first bus;

[0055] When the 220 kV main transformer is connected to the 220 kV second bus through the second bus isolating switch, the second bus isolating switch is open, the normally closed auxiliary contact flips, and the coil of the 2YQJ relay inside the secondary metering voltage switching device unit CZX-12GN-Q is energized to collect the secondary metering voltage of the second bus;

[0056] S2. The metering dedicated current assembly is used to convert the primary current flowing through the main transformer high-voltage circuit breaker into secondary metering current based on a preset current conversion ratio, and transmit the secondary metering current to the electric energy metering device assembly by using a control cable;

[0057] In this embodiment, the preset current conversion ratio is 1500 / 1 A;

[0058] The metering dedicated current assembly includes a metering dedicated voltage transformer and its secondary circuit assembly. The metering dedicated voltage transformer and its secondary circuit assembly include a 220 kV main transformer control cabinet, a 220 kV main transformer metering dedicated current transformer and a control cable with a preset cross-sectional area; it is connected to the electric energy metering device assembly through a control cable with a preset cross-sectional area, and each neutral line of the control cable uses a separate cable core;

[0059] In this embodiment, the number of separate cable cores used is 8, and the three-phase neutral lines sharing one cable core are cancelled;

[0060] S3. The electric energy metering device assembly is used to receive the secondary metering voltage and the secondary metering current for electric energy calculation;

[0061] The electric energy metering device assembly includes a trade settlement electric energy meter, an actual power generation calculation unit, and an error correction unit;

[0062] The trade settlement electric energy meter is used to receive the secondary metering voltage and the secondary metering current;

[0063] The actual power generation calculation unit is used to calculate the actual power generation of the generator in the thermal power plant;

[0064] The error correction unit calculates the voltage drop according to the resistance of the control cable, and corrects the voltage deviation based on the voltage drop;

[0065] The actual power generation of the generator in the thermal power plant is obtained, and is expressed by the formula:

[0066]

[0067] In the formula, P represents the actual power generation of the generator; V2 represents the secondary metering voltage; I2 represents the secondary metering current; represents a preset power generation factor.

[0068] Embodiment 2

[0069] This embodiment provides a method for controlling the loss of the trade settlement electric energy meter of the main transformer in a thermal power plant. The method includes:

[0070] Obtain the 220 kV bus voltage, convert it to the secondary metering voltage based on a preset voltage conversion ratio, convert the primary current flowing through the main transformer high-voltage circuit breaker to the secondary metering current based on a preset current conversion ratio; and transmit the secondary metering voltage and the secondary metering current to the trade settlement electric energy meter by using a control cable;

[0071] The trade settlement electric energy meter receives the secondary metering voltage and the secondary metering current to perform electric energy calculation, and obtains the actual power generation of the generator in the thermal power plant;

[0072] Control the loss of the trade settlement electric energy meter based on the actual power generation of the generator.

[0073] Embodiment 3

[0074] This embodiment provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, it implements a method for controlling the loss of the trade settlement electric energy meter of the main transformer in a thermal power plant as described in any embodiment of the present invention.

[0075] Embodiment 4

[0076] This embodiment provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, it implements a loss control method for a main transformer trade settlement watt-hour meter in a thermal power plant as described in any embodiment of the present invention.

[0077] It should be noted that the systems, electronic devices, and computer-readable storage media described in the present invention are all based on the same principle as the method described in Embodiment 1, and will not be elaborated here.

[0078] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A loss control system for the main transformer trade settlement watt-hour meter in a thermal power plant, characterized in that, Including: A dedicated metering voltage component, a dedicated metering current component, and an electric energy metering device component: The dedicated metering voltage component is used to convert the 220 kV bus voltage into a secondary metering voltage based on a preset voltage conversion ratio, and transmit the secondary metering voltage to the electric energy metering device component through a control cable; The dedicated metering current component is used to convert the primary current flowing through the main transformer high-voltage circuit breaker into a secondary metering current based on a preset current conversion ratio, and transmit the secondary metering current to the electric energy metering device component through a control cable; The electric energy metering device component is used to receive the secondary metering voltage and the secondary metering current for electric energy calculation, and obtain the actual power generation of the generator in the thermal power plant.

2. The loss control system of the main transformer trade settlement watt-hour meter for a thermal power plant according to claim 1, wherein The dedicated metering voltage component includes a dedicated metering voltage transformer, its secondary circuit component, and a secondary metering voltage switching component; the dedicated metering voltage transformer and its secondary circuit component transmit the secondary metering voltage from the voltage transformer control cabinet to the secondary metering voltage switching component, wherein the secondary metering voltage switching component and the electric energy metering device component are installed in the same switch cabinet.

3. A loss control system for the main transformer trade settlement watt-hour meter in a thermal power plant according to claim 2, characterized in that, The dedicated metering voltage transformer and its secondary circuit component include a 220 kV first bus voltage transformer control cabinet and a 220 kV second bus voltage transformer control cabinet; the 220 kV first bus voltage transformer control cabinet and the 220 kV second bus voltage transformer control cabinet are connected to the secondary metering voltage switching component through a control cable.

4. A loss control system for the main transformer trade settlement watt-hour meter in a thermal power plant according to claim 2, characterized in that, The secondary metering voltage switching component includes a DC power supply unit, a secondary metering voltage switching device unit, and a 220 kV bus disconnector position signal unit, wherein: The DC power supply unit is used to provide a DC control power supply for the secondary metering voltage switching device unit and the bus disconnector position signal unit; The secondary metering voltage switching device unit is used to collect and switch the secondary metering voltages of two paths of 220 kV buses in the voltage transformer control cabinet, and output the switched secondary metering voltage to the electric energy metering device component based on the 220 kV bus disconnector position signal; The 220 kV bus disconnector position signal unit is used to discriminate the connection disconnector between the main transformer high-voltage circuit breaker and the 220 kV bus, wherein the connection disconnector of the 220 kV bus includes a first bus disconnector and a second bus disconnector, and provides a metering voltage switching basis for the secondary metering voltage switching device unit; Keep the first bus disconnector, the normally closed auxiliary contact, and the second bus disconnector open, wherein the normally closed auxiliary contact is installed in the 220 kV main transformer control cabinet of the dedicated metering current component; when the 220 kV main transformer is connected to the 220 kV first bus through the first bus disconnector, the first bus disconnector is open, the normally closed auxiliary contact flips, the relay coil inside the secondary metering voltage switching device unit is energized, and the secondary metering voltage of the first bus is collected; When the 220 kV main transformer is connected to the 220 kV second bus through the second bus isolating switch, the second bus isolating switch is normally open, the normally open and normally closed auxiliary contacts are flipped, the relay coil inside the secondary metering voltage switching device unit is energized, and the secondary metering voltage of the second bus is collected.

5. A loss control system for the main transformer trade settlement watt-hour meter in a thermal power plant according to claim 1, characterized in that, The dedicated metering current assembly includes a dedicated metering voltage transformer and its secondary circuit assembly. The dedicated metering voltage transformer and its secondary circuit assembly include a 220 kV main transformer control cubicle, a 220 kV main transformer dedicated metering current transformer, and a control cable with a preset cross-sectional area. It is connected to the electric energy metering device assembly through a control cable with a preset cross-sectional area, and each neutral line of the control cable uses a separate cable core.

6. The loss control system of the main transformer trade settlement watt-hour meter for a thermal power plant according to claim 1, wherein The electric energy metering device assembly includes a trade settlement watt-hour meter, an actual power generation calculation unit, and an error correction unit. The trade settlement watt-hour meter is used to receive the secondary metering voltage and the secondary metering current. The actual power generation calculation unit is used to calculate the actual power generation of the generator in the thermal power plant. 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.

7. A loss control system for the main transformer trade settlement watt-hour meter in a thermal power plant according to claim 1, characterized in that, The actual power generation of the generator in the thermal power plant is obtained and expressed by the formula: Wherein, P represents the actual power generation of the generator; V2 represents the secondary metering voltage; I2 represents the secondary metering current; represents a preset power generation factor.

8. A method for controlling the loss of the main transformer trade settlement watt-hour meter in a thermal power plant, characterized in that, The method includes: Obtain the 220 kV bus voltage, convert it to the secondary metering voltage based on a preset voltage conversion ratio, convert the primary current flowing through the main transformer high-voltage circuit breaker to the secondary metering current based on a preset current conversion ratio, and transmit the secondary metering voltage and the secondary metering current to the trade settlement watt-hour meter using a control cable. The trade settlement watt-hour meter receives the secondary metering voltage and the secondary metering current for power calculation to obtain the actual power generation of the generator in the thermal power plant. Control the loss of the trade settlement watt-hour meter based on the actual power generation of the generator.

9. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the program, it implements a method for controlling the loss of the trade settlement watt-hour meter of the main transformer in a thermal power plant as described in claim 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements a method for controlling the loss of the trade settlement watt-hour meter of the main transformer in a thermal power plant as described in claim 8.

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