CN101852844A - A data verification device and method for an AC sampling and measuring device - Google Patents

Abstract

The present invention provides a data verification device and method for an AC sampling and measuring device. The device includes: a measurement data acquisition unit connected to the AC sampling and measuring device for obtaining electrical measurement data of the AC sampling and measuring device; The data acquisition unit is connected to the same loop of the AC sampling and measuring device, and is used to obtain the standard electrical measurement data of the loop; the error comparison unit is used to compare the electrical measurement data with the standard electrical measurement data, and obtain the electrical measurement data. Measure comparative data. The invention provides a method and system capable of automatic real-time error calibration of an AC sampling and measuring device running on-line; the cost of calibration work is reduced; and the safety and stability of the power system are improved.

Description

A data verification device and method for an AC sampling and measuring device

technical field

The invention relates to the field of electric power, in particular to the field of sampling measurement verification in power grids, and specifically to a data verification device and method for an AC sampling measurement device.

Background technique

Power plant integrated automation system has been widely used in all levels of power plants and substations because of its high degree of automation, advanced technology, reliable operation and many other advantages. With the extensive reference of power system comprehensive automation equipment, various types of AC sampling and measuring devices have also continuously entered the scope of monitoring and calibration work.

The AC sampling and measuring device is an important equipment widely used in power system monitoring and electrical measurement, especially after replacing the pointer instrument, it has become an indispensable main equipment. The AC sampling and measuring device mainly includes various electrical measurement collection, calculation, storage, etc. According to the State Grid Corporation of China Q/GDW 140-2006 "AC Sampling and Measuring Device Operation Inspection Management Regulations" and "State Grid Marketing (2005) 347" "AC Sampling and Measuring Device Calibration Specifications", the AC sampling and measuring device must be calibrated regularly, At least once a year on-site real load check, every three years on-site virtual load check once.

The verification method of the currently used AC sampling and measuring device (hereinafter referred to as "interchange device") is: manual on-site regular verification, the current loop of the standard meter is connected in series to the current loop of the verified alternate mining device, and the standard meter The voltage loop is connected to the voltage loop of the inter-mining device to be verified, and two people read the power value displayed on the standard meter and the inter-mining device at the same time, and calculate the verification error of the inter-mining device.

The main problems of this method are: 1. The on-site verification needs to be operated on the secondary voltage and current loops, which is prone to safety accidents such as open circuit of the current loop and short circuit of the voltage loop; 2. The on-site detection cycle is long, and real-time monitoring cannot be performed. 3. The workload of on-site calibration is heavy, and now the cross-acquisition device has been widely used in 500kV and 220kV substations, and the 110kV substation is a power supply hub all over the entire power grid; 4. Problems cannot be found in time Faults that occur between periodic inspections, such as: out-of-tolerance, wrong wiring, equipment damage, etc.

The contents disclosed in Chinese patent applications 91106409.5 and 00211787 are incorporated here as the prior art of the present invention.

Contents of the invention

The purpose of the present invention is to provide a data verification device of an AC sampling and measuring device, which can perform real-time automatic error verification on the online running AC sampling and measuring device.

Another object of the present invention is to provide a data verification method for an AC sampling and measuring device, which can perform real-time automatic error verification of an AC sampling and measuring device running online.

In order to achieve the above purpose, an embodiment of the present invention provides a data verification device for an AC sampling and measuring device, which includes: a measurement data acquisition unit connected to the AC sampling and measuring device for obtaining the data of the AC sampling and measuring device Electrical measurement data; a standard data acquisition unit, connected to the same loop of the AC sampling measurement device, used to obtain the standard electrical measurement data of the loop; an error comparison unit, used to compare the electrical measurement data with the standard electrical measurement Measurement data to obtain electrical measurement comparison data.

In order to achieve the above purpose, an embodiment of the present invention also provides a data verification method for an AC sampling and measuring device, the method comprising: obtaining the electrical measurement data of the AC sampling and measuring device; obtaining the standard electrical measurement data of the same loop of the AC sampling and measuring device ; Comparing the electrical measurement data with the standard electrical measurement data to obtain electrical measurement comparison data.

The beneficial effect of the embodiments of the present invention is to provide a method for automatic real-time error verification of an online AC sampling and measurement device; reduce the cost of verification work; and improve the safety and stability of the power system.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is the schematic diagram of the data verification device of the AC sampling measuring device provided by the present invention;

Fig. 2 is a structural diagram of a data verification device of an AC sampling measurement device provided by an embodiment of the present invention;

Fig. 3 is a structural diagram of a data verification device of an AC sampling measurement device provided by an embodiment of the present invention;

Fig. 4 is a structural diagram of a loop switching unit in a data checking device of an AC sampling and measuring device provided by an embodiment of the present invention;

Fig. 5 is a schematic circuit diagram of the current open circuit protection unit in the data checking device of the AC sampling and measuring device provided by the embodiment of the present invention;

6 is a schematic circuit diagram of a voltage short-circuit protection unit in a data verification device of an AC sampling measurement device provided by an embodiment of the present invention;

Fig. 7 is a flowchart of a data verification method of an AC sampling measurement device provided by an embodiment of the present invention;

Fig. 8 is a schematic structural diagram of a data checking device of an AC sampling and measuring device according to an embodiment of the present invention;

Fig. 9 is a structural diagram of a data checking device of an AC sampling and measuring device according to another embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Embodiments of the present invention provide a data verification device and method for an AC sampling and measuring device. The present invention will be described in detail below in conjunction with the accompanying drawings.

The data verification device (hereinafter referred to as the monitoring system) of the AC sampling and measuring device provided by the present invention is a system that integrates signal, data acquisition and processing, database management, automatic error verification of the on-site AC sampling and measuring device, state monitoring, alarm, and communication. Monitoring System. The main functions include: local control to verify the error of the AC sampling and measuring device, alarm, remote control and verifying the error of the AC sampling and measuring device, etc., store test data, automatically store the downloaded data, and form an error report.

As shown in Figure 1, it is a schematic diagram of the data verification device of the AC sampling and measuring device provided by the present invention, which includes: a standard meter with a high accuracy level is equipped inside the on-site monitoring system, and the voltage of the standard meter is collected through a multi-level switching device , current, frequency and other signals, the electrical measurement data of the data processing is compared with the electrical measurement data of the calibrated circuit to calculate the error and record the results. When the comparison determines that the calibrated circuit is out of tolerance, an alarm will be prompted. The multiple loops in the substation are controlled by the calibration system to switch different lines, which can be cyclically tested.

As shown in Figure 2, it is a structural diagram of the data verification device of the AC sampling and measuring device provided by the present invention, wherein the measurement data acquisition unit 201 is connected to the AC sampling and measuring device for obtaining the AC sampling and measuring device electrical measurement data;

The standard data acquisition unit 202 is connected to the same loop of the AC sampling and measuring device, and is used to obtain the standard electrical measurement data of the loop;

The error comparison unit 203 is configured to compare the electrical measurement data with the standard electrical measurement data to obtain electrical measurement comparison data.

The data verification device of the AC sampling and measuring device provided by the above embodiment can solve the problem that the error of the AC sampling and measuring device in operation cannot be tested effectively and timely at present; and no on-site operation is required.

As shown in Figure 3, it is a structural diagram of a data verification device of an AC sampling measurement device provided by the present invention, wherein the measurement data acquisition unit is connected to the AC sampling measurement device for obtaining the AC sampling measurement The electrical measurement data of the device, the electrical measurement data includes: voltage value, current value, phase value, power value and frequency value.

A standard data acquisition unit, connected to the same loop of the AC sampling and measuring device, for obtaining standard electrical measurement data of the loop;

The error comparison unit is used to compare the electrical measurement data with the standard electrical measurement data to obtain electrical measurement comparison data.

The loop switching unit is respectively connected to the loops of the multiple AC sampling and measuring devices and the standard data acquisition unit, and is used to switch the connection between the standard data acquiring unit and the loop of the verified AC sampling and measuring device.

The control unit is used to control the loop switching unit to switch loops; the control unit includes an alarm unit for storing comparison alarm data and sending an alarm when the electrical measurement comparison data is greater than the comparison alarm data.

The current open circuit protection unit and the voltage short circuit protection unit are used to protect the voltage and current loops.

As shown in Figure 4, it is a structural diagram of the circuit switching unit in the data verification device of the AC sampling and measuring device provided by the present invention. The circuit switching unit is composed of two-stage switching:

The first-level switching unit is composed of 64 lines, each line is composed of three-phase six-wire current input signal and three-phase four-wire voltage input signal, and adopts a current loop open circuit protection unit and a voltage loop short circuit protection unit; The control unit sends out the first-level and second-level control signals to ensure that only one line signal of the 64 lines of the first level enters the data collection.

As shown in Figure 5, it is a schematic circuit diagram of the current open circuit protection unit in the data verification device of the AC sampling and measuring device provided by the present invention. JRb is closed, the secondary current of the transformer forms a complete closed circuit through JRb, the alarm voltage U0=0, and the alarm unit is not activated.

When this circuit is selected, JRa is closed, JRb is opened, the secondary current of the transformer passes through JRa and the current circuit of the standard meter (standard data acquisition unit) to form a complete closed circuit, the alarm voltage U0=0, and the alarm unit is not activated.

When an open circuit occurs in the protected area, the positive half-wave of the secondary current of the transformer forms a complete closed loop through D1 and D3, and the negative half-wave forms a complete closed loop through D2 and D4, and the current transformer is still in normal working condition. When the alarm voltage U0≠0, the alarm unit is activated, prompting that an open current fault occurs in the protected area.

As shown in Figure 6, it is a schematic circuit diagram of the voltage short-circuit protection unit in the data verification device of the AC sampling and measuring device provided by the present invention. When the circuit connected to the voltage short-circuit protection unit is not selected, TRa is not closed, and the fuse protector There is no voltage drop on B, the alarm voltage U0=0, and the alarm unit is not activated.

When this circuit is selected, TRa is closed, and when there is no short circuit in the protected area, the alarm voltage U0=0, and the alarm unit is not activated.

When a short circuit occurs in the protected circuit, the fuse protector B bears all the secondary voltage, and the voltage transformer is still in normal working condition. Alarm voltage U0≠0, start the alarm unit. Prompt that a voltage short circuit fault occurs in the protected area.

As shown in Figure 7, it is a flowchart of a data verification method for an AC sampling and measuring device provided by the present invention. The method is used to detect and verify the data of an existing AC sampling and measuring device, including steps:

Step 701, obtain the electrical measurement data of the AC sampling and measuring device through the data acquisition unit; the electrical measurement data includes: voltage value, current value, phase value, power value and frequency value, etc.

Step 702, connect the standard meter to the same loop of the AC sampling measurement device to obtain the standard electrical measurement data of the same loop of the AC sampling measurement device;

Step 703, comparing the electrical measurement data with the standard electrical measurement data to obtain electrical measurement comparison data.

Wherein, the method provided by another embodiment of the present invention further includes the step of switching the connection between the standard data acquisition unit and the circuit of the verified AC sampling and measuring device through the circuit switching unit.

Wherein, the method provided by another embodiment of the present invention further includes the step of: sending an alarm through the alarm unit when the electrical measurement comparison data is greater than the comparison alarm data.

The data checking device of the AC sampling and measuring device provided by the present invention is designed according to a building block structure, and specifically includes: an online real load checking device at a substation end and a remote operation of a system master station. The online load calibration device includes current and voltage switching devices, standard meters, data processing and communication controllers, ground and network commissioning workstations and other parts. The data processing and communication controller completes the functions of data collection, storage, maintenance, uploading and communication, and the local survey and network survey workstation mainly realizes the functions of data query, analysis and diagnosis. The system master station and the remote monitoring terminal device at the factory station adopt a network communication method based on the TCP/IP protocol.

Its development and application process mainly includes:

1. Develop the software system of the calibration device;

2. Design the electrical measurement acquisition subsystem of the AC sampling measurement device;

3. Design the standard meter electricity measurement acquisition subsystem;

4. Design the AC sampling measurement device and the comparison subsystem of the standard electrical measurement value;

5. Design and develop the control panel of the current and voltage switching device;

6. Design and develop the control panel of the online load calibration device;

7. On-site installation, commissioning and trial operation;

The AC sampling and measuring device provided by the embodiment of the present invention includes: the voltage, current and other signals of the secondary circuit of the on-site multi-channel transformer are connected to the circuit switching device, and the data processing and communication controller is responsible for controlling the circuit switching device to perform gating. After the switching device is gated, the secondary circuit of the transformer is connected to the monitoring standard meter, and the data of the standard meter is collected and processed by the data processing and communication controller. The data processing and communication controller is responsible for the error comparison and monitoring of the measurement data from the remote control workstation and the measurement data of the monitoring standard table, and the detected data can be transmitted remotely through the data network.

As shown in Fig. 8 and Fig. 9, the structural diagram and structural diagram of the data verification device of the AC sampling and measuring device provided by another embodiment of the present invention mainly include:

Data processing and communication controller (or PC controller), circuit switching device, monitoring standard table, auxiliary power supply, measurement circuit input terminal block, etc.

Data processing and communication controller (transfer mining monitoring and control device): the control core of the substation detection device. There are five main functions:

1. The control circuit switching device gates the secondary circuit of the transformer;

2. Control and monitor the standard table to measure the gated loop;

3. Obtain the measurement data of the AC sampling and measuring device through the telecontrol workstation;

4. Process the measurement data of the AC sampling measurement device and the monitoring standard meter and obtain the real-time error;

5. Responsible for remote control of server operations or data requests.

Loop switching device: including 'current loop switching module' and 'voltage loop switching module', two-stage switching technology, at most realizing switching of multiple voltages and currents, adopting two-stage control for multiple loops and input multiple loop voltages , The current signal is adjusted to ensure that each state has only the voltage and current output of the same loop, and the test channel is switched under the control of the loop switching signal. The current loop switching module uses the technology to ensure that the loop is not open circuit, and the voltage loop switching module uses the voltage short circuit protection technology.

Monitoring standard table: Provides high-accuracy test power values, mainly including electrical measurements such as voltage, current, phase, power, and frequency.

In the above-mentioned embodiment, the control function of the monitoring and control device for alternate mining is:

1. The ground dispatching and North China network dispatching can respectively control the remote control workstation (AC sampling and measuring device) and the online real-time error monitoring and control device through the inter-acquisition monitoring and control device;

2. The remote control workstation (AC sampling and measuring device) accepts the orders of the ground dispatching and the North China network dispatching and can transmit data to it;

3. The online real-time error monitoring and control device of the AC sampling and measuring device accepts the orders of the ground dispatching and the North China network dispatching and can transmit data to it;

4. The online real-time error monitoring and control device of the AC sampling and measuring device can automatically complete the online real-time error verification and upload the data to the local dispatching and North China network dispatching;

5. After the online real-time error monitoring and control device of the AC sampling and measuring device receives the ground dispatching or North China network dispatching or the operator's calibration error task, ①. Send a switching command to the current and voltage switching device, so that the current and voltage switching device follows the command It is required to connect the current and voltage circuits of the line to be verified, and the standard meter will send the data of the line to be verified to the data comparison unit of the online real-time error monitoring and control device of the AC sampling and measuring device through collection, calculation, and data processing; ②.Open The inter-acquisition information processing control gate enables the verified line data of the AC sampling and measuring device to be processed and sent to the data comparison unit of the online real-time error monitoring and control device of the AC sampling and measuring device; The error calibration of the circuit can be sent to the ground dispatching and North China network dispatching.

The beneficial effects brought by the above embodiments of the present invention are: it can solve the problem that the error of the AC sampling and measuring device in operation cannot be effectively and timely tested at present; establish a time-scale data system for the AC sampling and measuring device; no power outage is required, and the workload and maintenance of the power outage test can be reduced (no need to apply for stop and power transmission); greatly reduce the workload of routine calibration, improve work efficiency; reduce maintenance costs (business trips, traffic, etc.); realize the transformation of measurement equipment detection from traditional manual on-site methods to automatic detection, Improve the reliability of system power supply, improve the efficiency of equipment maintenance; reduce a large number of on-site operations, improve the safety and stability of system operation, ensure the economy and reliability of power grid operation; improve the power quality of power users.

After the popularization and application of the present invention, all substation verification devices of 220kV and 550kV in North China and even the national power grid can be established, which can replace the existing manual verification method, improve work efficiency, reduce labor intensity, and realize timely grasp of the operating status of the AC sampling and measuring device , to provide trend analysis, early warning and control auxiliary decision-making for power grid managers. Ensuring the accuracy and reliability of AC sampling measurement will definitely bring considerable economic benefits to the power grid. With the improvement of technology and mature application, it can be further extended to 110kV, 35kV systems and power plants.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Protection scope, within the spirit and principles of the present invention, any modification, equivalent replacement, improvement, etc., shall be included in the protection scope of the present invention.

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the scope of the present invention. Protection scope, within the spirit and principles of the present invention, any modification, equivalent replacement, improvement, etc., shall be included in the protection scope of the present invention.

Claims (10)

1. the data calibration device of an AC sampling and measuring device is characterized in that, described device comprises:

The measurement data acquiring unit is connected in described AC sampling and measuring device, is used to obtain the electrical measurement data of this AC sampling and measuring device;

The normal data acquiring unit is connected in the same loop of described AC sampling and measuring device, is used to obtain the standard electric measurement data in this loop;

The error comparing unit is used for more described electrical measurement data and standard electric measurement data, obtains the electrical measurement comparing data.

2. the data calibration device of AC sampling and measuring device according to claim 1 is characterized in that, described device also comprises:

The loop switch unit is connected to the loop and the described normal data acquiring unit of a plurality of AC sampling and measuring devices, is used for switching standards data capture unit and being connected by the loop of verification AC sampling and measuring device.

3. the data calibration device of AC sampling and measuring device according to claim 1 is characterized in that, described device also comprises:

Alarm unit is used for storing relatively alert data, and gives the alarm during greater than described relatively alert data in described electrical measurement comparing data.

4. the data calibration device of AC sampling and measuring device according to claim 2 is characterized in that, described loop switch unit comprises:

The current return switch unit is used to make the current return of described normal data acquiring unit to be connected in series to by the current return of verification AC sampling and measuring device;

The voltage circuit switch unit is used to make the voltage circuit of described normal data acquiring unit and links by the voltage circuit of verification AC sampling and measuring device.

5. the data calibration device of AC sampling and measuring device according to claim 4 is characterized in that, described current return switch unit also comprises: open-circuit-protection unit and open circuit alarm unit;

Wherein, described open-circuit-protection unit is used for sending the open circuit alerting signal to described open circuit alarm unit when the generation of protected loop is opened a way, and this open circuit alarm unit gives the alarm according to described open circuit alerting signal.

6. the data calibration device of AC sampling and measuring device according to claim 4 is characterized in that, described voltage circuit switch unit comprises: short-circuit protection unit and short-circuit alarming unit,

Wherein, protect this loop when described short-circuit protection unit is used for being short-circuited in protected loop and send the short-circuit alarming signal to described short-circuit alarming unit, described short-circuit alarming unit gives the alarm according to described short-circuit alarming signal.

7. the data calibration device of AC sampling and measuring device according to claim 1 is characterized in that, described electrical measurement data and standard electric measurement data comprise:

Magnitude of voltage, current value, phase value, performance number and frequency values.

8. the data verification method of an AC sampling and measuring device is characterized in that, described method comprises:

Obtain the electrical measurement data of AC sampling and measuring device;

Obtain the standard electric measurement data in this same loop of AC sampling and measuring device;

More described electrical measurement data and standard electric measurement data obtain the electrical measurement comparing data.

9. method according to claim 8 is characterized in that, described method also comprises:

Switch described normal data acquiring unit and being connected by the loop of verification AC sampling and measuring device.

10. method according to claim 8 is characterized in that, described method also comprises:

Give the alarm during in described electrical measurement comparing data greater than described relatively alert data.

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