RU45535U1 - COMPLEX MEASURING AND COMPUTING FOR CONTROL AND METERING OF ELECTRIC POWER - Google Patents

Abstract

The utility model relates to the field of information and measurement technology, mainly to measuring devices - complexes of software and hardware designed to automatically collect data in the form of electrical signals (pulsed, current, voltage) from primary measuring transducers (measuring transformers, electric energy meters, analog current and voltage sensors), their processing, adjustment, accumulation and delivery of information in the form of tables and graphs of the amount of electricity and power to the screen of personal computers (server, workstation) or, on demand, using a modem and switched communication channels to an energy supplying organization, as well as for subsequent analysis of information and the issuance of control signals to a technological object. The proposed utility model can be used in the energy, utilities, chemical, oil and gas industries. The measuring and computing complex for monitoring and accounting for electricity allows us to eliminate the commercial underestimation of the consumed electricity, which leads to a reduction in additional losses in the financial and economic activities of energy supplying organizations. This is achieved by the fact that in the measuring and computing complex for monitoring and accounting for electricity, a correction device and sensors for the coefficient of nonlinear distortion K _are introduced, power factor cosφ and ambient temperature t °, and sensors for the coefficient of nonlinear distortion, power factor and ambient temperature are connected to the entrances

corrections forming device, the output of which is connected to the second input of the dispatcher workstation.

Description

The utility model relates to the field of information and measurement technology, mainly to measuring devices - complexes of software and hardware designed to automatically collect data in the form of electrical signals (pulsed, current, voltage) from primary measuring transducers (measuring transformers, electric energy meters, analog current and voltage sensors), their processing, adjustment, accumulation and delivery of information in the form of tables and graphs of the amount of electricity and power to the screen of personal computers (server, workstation) or, on demand, using a modem and switched communication channels to an energy supplying organization, as well as for subsequent analysis of information and the issuance of control signals to a technological object.

The proposed utility model can be used in the energy, utilities, chemical, oil and gas industries.

The well-known complex of software and hardware "Telescope" [Technical description No. ABBL 002.001.TO. System of automation of accounting for electricity consumption "Telescope". - NPF "Proryv", 1999], designed to build distributed metering and electricity management systems, used in the automation of technological processes in the energy, utilities, chemical and oil industries, produced by the scientific and production company "Proryv" (State Register No. 14714-95) .

The complex includes measuring current and voltage transformers, electric power meters ПСЧ-4, ПСЧ-4Р, ПСЧ-3,

ПСЧ-3Р, programmable controllers of the type TK-84, TK-85, automated workplace of the dispatcher, wired communication lines, radio modem.

In the well-known complex, the conditions under which the technical means of electricity metering are operated and their technical condition are far from the norms defined by the standards and regulatory documents. This leads to the fact that the errors of such metering devices go beyond standard limits and include not only random, but also systematic components depending on operating conditions (ambient temperature, nonlinear distortions in electrical circuits, power factor) of the controlled connection.

The lack of a technical device in the system that allows for taking these errors into account and introducing amendments (corrections) to the electricity metering system leads to additional losses in the financial and economic activities of energy supplying organizations.

Closest to the proposed one is a measuring and computing complex (CPI) for metering and energy management [Utility Model Certificate No. 18313 of the Russian Federation, IPC6: G 01 R 22/00. Measuring and computing complex for metering and energy management / B.C. Zubkov et al. (RF). Declared 10/12/2000; Publ. 10.06.01.], Containing measuring current and voltage transformers, electronic electric energy meters, programmable microcontrollers of the approved types MK 989, MK1781 (State Register No. 19121-99), a radio type PM19, a radio station type MOTOROLA, a server for an automated workstation of a dispatcher, workstations , wired communication lines. The measuring and computing complex is used to account for the electric energy of industrial enterprises, and to build automated process control systems.

The new type of design-composable design of the MK microcontroller with an electrically reprogrammable memory, used in the measuring and computing complex, makes it possible to increase the accuracy of accounting for pulse-count and analog signals.

Recently, however, there has been a decrease in loads in a number of nodes of the power system, as well as a decrease in electricity consumption by industry, which in turn has caused a negative error in automated power control and metering systems (ASKUE). The reason for this was the occurrence of a negative error in the primary current and voltage sensors, which are used as measuring current and voltage transformers. Primary current for current transformers, primary voltage for voltage transformers, secondary load power factor (cosφ) for current transformers, non-linear sinusoidal distortion of current and voltage curves (K _nor ), and temperature (t °) have the greatest influence on the errors of measuring transformers. the environment.

The lack of a technical device in the system that can compensate for the above errors, reduces the accuracy of the system of commercial metering of electricity, leading, respectively, to underestimating the energy consumed.

The basis of this utility model is the task of creating such a set of software and hardware for monitoring and accounting of electricity, which would be devoid of the disadvantages of the prototype and would have a higher metering accuracy due to correction of errors of current and voltage transformers.

The problem is solved in that in the measuring and computing

a complex for monitoring and accounting for electricity, containing h measuring current and voltage transformers, h electricity meters such as ПСЧ-4, ПСЧ-4Р, ПСЧ-3, ПСЧ-3Р or other similar meters,

radio modem, MOTOROLA type radio station, dispatcher workstation server, workstations, wired communication lines, unlike the prototype, a correction device and sensors for the coefficient of nonlinear distortion, power factor and ambient temperature were introduced, and sensors for the coefficient of nonlinear distortion, power factor and temperature ambient air are connected to the inputs of the correction device, the output of which is connected to the second input of the workstation for of the patcher.

The essence of the utility model is illustrated by specific examples of its implementation and the accompanying drawings.

Figure 1 - shows a General view (architecture) of the complex. Figure 2 - scheme for the correction of errors of the measuring channels. The complex contains counters 1 of electric energy of the type ПСЧ-4, ПСЧ-4Р, ПСЧ-3, ПСЧ-3Р or other similar counters, sensors of factors affecting the errors of measuring current and voltage transformers - non-linear distortion coefficient K _nor , power factor cosφ and ambient temperature t °, (respectively 2, 3, 4), amendment device 5, microcontrollers 6 approved types MK 989, MK1781 based on a single-chip processor PIC16F877 / 201P, radio modem 7, radio station type 8 MOTOROLA, server 9 automated working m hundred dispatcher workstations 10, wired communication line, measuring the current and voltage transformers (not shown).

The complex works as follows.

The signals from the electric energy meters 1 are fed to the digital input of the microcontrollers 6, tuned to a pulse-frequency data reception mode. The microcontrollers accumulate pulses and transmit them over the air (modem 7 -

radio station 8 - modem 7) to server 9 of the dispatcher’s workstation at his request.

With sensors THD K _audio, power factor cosφ and the ambient temperature t ° measuring current transformers and voltage measuring information supplied to form amendments 5 device which generates V1 = f (K _audio), V2 = f (cosφ) of data functions , V3 = f (t °).

The generated arrays are transmitted via the RS 485/232 interface to the computing device of the workstation of the dispatcher 9, where they are used to correct errors in the measuring channels during the final output of electric energy metering data (Fig. 2).

In accordance with the algorithm of the system, which is determined by the software, after a certain time period, tied to astronomical time, the pulses accumulated during this period of time are processed and the processed data is displayed on the screen of the dispatcher's automated workstation (or workstations 10). In the form of tables and graphs of energy and power consumed. Data, depending on the type of energy, is recorded with a certain time interval in the standard SQL server database 9 and can be accessed from the workstation of the dispatcher or workstations 10. Data on energy and power consumption can be transmitted via radio channel to the power supply organization for commercial metering of consumed electricity.

The use of the device for generating amendments 5 makes it possible to increase the accuracy of the system of commercial accounting of electric energy by correcting errors of measuring current and voltage transformers, such as nonlinear distortions of the sinusoidal shape of the current and voltage curves K _nor , the power factor of the secondary load cosφ and

the effect of changes in ambient temperature t °, and as a result, eliminate the commercial underestimation of the consumed electricity.

Ultimately, this leads to a reduction in additional losses in the financial and economic activities of energy supplying organizations.

The complex is made in mass production, does not require scarce materials, unique purchased and component parts. The technical facilities included in the complex have been tested for type approval and recommended by the bodies of the Federal Agency for Technical Regulation and Metrology (Gosstandart) for use in commercial electricity metering systems.

Claims (1)

A measuring and computing complex for metering and energy management, containing n measuring transformers, h electronic meters of electrical energy, m programmable controllers, a radio modem, a radio station, a server for the dispatcher's workstation, workstations, wired communication lines, characterized in that a correction device is introduced and sensors of the coefficient of nonlinear distortion, power factor, ambient temperature, and sensors of the coefficient of nonlinear distortion, to power factor and the ambient temperature are connected to the inputs forming correction device whose output is connected to the second input automated work dispatcher.