CN111413893B - Wireless current collection system for starting and debugging of ultra-high voltage power transmission and transformation project - Google Patents
Wireless current collection system for starting and debugging of ultra-high voltage power transmission and transformation project Download PDFInfo
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- CN111413893B CN111413893B CN202010135716.8A CN202010135716A CN111413893B CN 111413893 B CN111413893 B CN 111413893B CN 202010135716 A CN202010135716 A CN 202010135716A CN 111413893 B CN111413893 B CN 111413893B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 35
- 230000009466 transformation Effects 0.000 title claims abstract description 28
- 239000000523 sample Substances 0.000 claims abstract description 17
- 238000005070 sampling Methods 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims abstract description 6
- 230000001939 inductive effect Effects 0.000 claims abstract description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 9
- 229910052744 lithium Inorganic materials 0.000 claims description 9
- 238000002955 isolation Methods 0.000 claims description 7
- 238000009432 framing Methods 0.000 claims description 6
- 230000003750 conditioning effect Effects 0.000 claims description 4
- 230000005355 Hall effect Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000001976 improved effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The application discloses a wireless current collection system for starting and debugging of ultra-high voltage power transmission and transformation engineering, which comprises a current collection module for inducing secondary current of a power transmission and transformation line or a main transformer and outputting a corresponding weak voltage signal; the signal acquisition module is used for sampling the voltage signal and converting the sampled signal into a data frame with a time stamp; the time-stamped data frames are sent by the wireless module to the user side. The wireless current acquisition device adopts the open-close type current probe and wireless data transmission, replaces cables used for measurement and transmission in the prior art, avoids a large amount of paying-off work, avoids the safety risk of the traditional measurement mode, and improves the safety.
Description
Technical Field
The application relates to a wireless current collection system for starting and debugging an ultra-high voltage power transmission and transformation project, and belongs to the field of starting and debugging the ultra-high voltage power transmission and transformation project.
Background
Before the newly built power transmission and transformation project is put into operation, in order to check the insulation performance of a circuit and a transformer substation and the protection of a transformer from excitation surge current, switching-on and switching-off operations are required to be carried out on the circuit and the transformer so as to simulate an electromagnetic transient process of system operation. In the test process, the switching-on inrush current of the line and the main transformer is required to be measured so as to master the switching-on overcurrent condition of the line and the transformer, and the capability of relevant protection against the switching-on inrush current is checked.
The traditional current logging device and method need to connect a current signal wire string to an in-station CT secondary circuit, and the wiring mode has the following problems: firstly, the wiring workload is large, time and labor are wasted, if improper operation or unexpected disconnection occurs, a CT secondary circuit can be opened, and personnel and equipment safety can be seriously threatened; secondly, the signal cables are distributed in all channels of the relay protection room, so that transient signal loss is easily caused by damage, and the test process is seriously influenced; thirdly, the signal cable is physically connected with equipment, and the signal cable is easy to pull, so that the equipment of the relay protection room is damaged. The power transmission and transformation project starts the debugging test as the last pass of the network access test of the equipment, the test result directly influences whether the equipment can safely run, and the existing current logging method has larger influence on the safety of personnel and power equipment.
Disclosure of Invention
The application aims to: the application provides a wireless current collection system for starting and debugging of an ultra-high voltage power transmission and transformation project, which is used for improving the working efficiency and the safety and the reliability of a test.
The technical scheme is as follows: the technical scheme adopted by the application is that the wireless current acquisition system for starting and debugging of the ultra-high voltage power transmission and transformation project comprises a current acquisition module which is used for inducing secondary current of a power transmission and transformation circuit or a transformer and outputting a corresponding weak voltage signal; the signal acquisition module is used for sampling the voltage signal and converting the sampled signal into a data frame with a time stamp; the time-stamped data frames are sent to the user side.
The system also comprises a power module for supplying power to the current acquisition system.
The power module comprises a built-in lithium battery and a remote switch module, and an external power supply and the lithium battery are both connected to the remote switch module.
The current acquisition module adopts a mixed sampling probe formed by a mutual inductor coil based on Faraday law and a Hall sensor based on Hall effect, a A, B and C-phase resistor voltage-dividing network and an isolation operational amplifier.
The signal acquisition module comprises a signal conditioning module, an analog-to-digital converter, a control acquisition and time scale unit and a framing and transmitting unit.
The control acquisition and timely marking unit adopts a programmable system on a chip, and comprises an ARM module and an FPGA module.
The framing and transmitting unit frames the obtained current data of the power transmission and transformation line or the transformer and the time mark to form a data frame with a time stamp.
The wireless module is further included, and the data frames with the time stamps are sent to the user side by the wireless module.
The wireless module is a 5Ghz wireless bridge.
The beneficial effects are that: the wireless current acquisition device adopts the open-close type current probe to replace measurement in the prior art, so that the safety risk of the traditional measurement mode is avoided, and the safety is improved. Meanwhile, the application also adopts wireless data transmission to replace cables used for transmission, thereby avoiding a large amount of paying-off work. In addition, the application adopts a wireless transmission and control mode, thereby avoiding the work of manually connecting the current signal wire string to the CT secondary circuit in the station and improving the working efficiency of the test.
Drawings
FIG. 1 is a block diagram showing the structure of embodiment 1;
fig. 2 is a schematic structural view of embodiment 1;
FIG. 3 is a block diagram showing the structure of embodiment 2;
fig. 4 is a schematic structural diagram of embodiment 2.
Detailed Description
The present application is further illustrated in the accompanying drawings and detailed description which are to be understood as being merely illustrative of the application and not limiting of its scope, since various modifications of the application, which are equivalent to those skilled in the art, will fall within the scope of the application as defined in the appended claims after reading the application.
Example 1
As shown in fig. 1, the present application includes a current acquisition module, a signal acquisition module, and a transmission module. The current acquisition module acquires secondary current of a power transmission and transformation line or a transformer by adopting an open-close type current probe, and the open-close type current probe is a hybrid sampling probe formed by a transformer coil based on Faraday's law and a Hall sensor based on Hall effect. The open-close type current probe is provided with an openable measuring magnetic core, the magnetic core is sleeved on a corresponding current transformer secondary circuit when the current of a power transmission and transformation circuit or a transformer is measured, and when the current passes through the measured circuit, an annular magnetic field is formed inside the magnetic core. The Hall sensor is embedded in the magnetic core, and the intensity of a fixed magnetic field and a low-frequency magnetic field in the magnetic core can be measured by measuring the voltage at two ends of a Hall crystal through which a certain current flows; the transformer coil is sleeved on the magnetic core, the strength of the high-frequency magnetic field can be measured through the transformer coil, and the output voltages of the transformer coil and the magnetic core are mixed to form final output. The magnetic field intensity in the original magnetic core can be measured by measuring the output voltage of the current probe, and the measured current is reversely deduced by the fixed ratio of the magnetic field intensity of the magnetic core to the measured current. The open-close type current probe is not physically connected with a power transmission and transformation circuit or a transformer secondary circuit, and the risk of open-circuit of the secondary circuit is avoided. According to the principle, the current acquisition module measures the currents of the phases A, B and C of the power grid. As further shown in fig. 2, the current collection module further includes a resistor divider network and an isolation op-amp for A, B and C phases. And each phase of voltage signal output by the open-close type current probe is input into the signal acquisition module after passing through a A, B and C phase resistor voltage division network and an isolation operational amplifier in sequence.
The signal acquisition module comprises a signal conditioning module, an analog-to-digital converter, a control acquisition and time scale unit and a framing and transmitting unit. The resistor divider network is used for adjusting the amplitude of the input signal to enable the amplitude to be matched with the input amplitude of the isolation operational amplifier. The isolation op-amp prevents external high voltage signals and surges from interfering with the operation of or causing damage to the internal equipment. And a signal conditioning module in the signal acquisition module adjusts the amplitude of the voltage signal so as to match the input range of the subsequent analog-digital converter. And then an analog-to-digital converter in the signal acquisition module samples the voltage signals of each phase with the amplitude adjusted to obtain digital voltage signals, and then the current probe transformation ratio is used for calculating the magnitude of the measured current. The analog-to-digital converter adopts AD7606.
The control acquisition and time marking unit adopts SOPC (programmable system on a chip), and comprises an ARM module and an FPGA module, wherein the FPGA module controls the analog-to-digital converter according to time and second pulse signals provided by the GPS/Beidou module. The GPS/Beidou signal comes from an external GPS/Beidou antenna. The FPGA module controls the analog-to-digital converter to sample 200K times between two adjacent second pulse rising edges, namely 200KHz sampling frequency, and simultaneously marks each sampling signal with a time mark and sends the time mark to the ARM module. The ARM module runs a Linux operating system, and a built-in driver of the ARM module realizes the functions of reading digital voltage signals obtained by sampling from an FPGA, receiving control instructions controlled by an upper computer, supporting RMS abrupt change triggering, triggering a signal threshold triggering as a triggering mode to trigger the packaging and returning of the digital voltage signals, packaging and returning of digital voltage signal data to the upper computer and the like. When the GPS/Beidou signal is stably locked, the GPS/Beidou signal is adopted as a time reference source for synchronous acquisition among acquisition devices, and the SOPC samples three-phase voltage signals A, B and C according to the time reference. And when the GPS/Beidou signal is changed from a stable locking state to an unlocking state, the time scale unit can carry out local self-locking based on a local high-precision crystal oscillator and an algorithm, and the error is controlled within 50us after the local 4-hour synchronous unlocking. The framing and transmitting unit groups the obtained current data of the power transmission and transformation line or the transformer and the time mark to form a data frame with a time stamp, and meanwhile, the data frame with the same content can store and preserve a backup file in the equipment.
The transmission module can be a wireless module, and particularly can transmit the time frame back to the central user side by adopting a 5Ghz wireless bridge, and current waveforms are displayed on a terminal display screen to realize distributed current acquisition. Therefore, the device realizes the functions of unmanned measurement and wireless transmission of current information of the power transmission and transformation line or the transformer.
Example 2
As shown in fig. 3, this embodiment includes the whole contents of embodiment 1, and is provided with a power supply module. As shown in fig. 4, the power module supplies power to the whole device, and comprises a built-in 24V/10AH lithium battery and a remote switch module. The lithium battery with 24V/10AH can be used, or an external power supply can be used as a power supply, and the lithium battery and the external power supply are connected to the remote switch module through the power supply selection switch. When the device is used, a lithium battery or external power supply is selected as a power supply through a local power supply selection switch. After the equipment works, a user can control the remote switch module through the LORA communication protocol so as to control the standby or work of the system. The built-in lithium battery can support the device to continuously work for 20 hours on site and stand by for 70 hours.
Claims (8)
1. The wireless current collection system for the starting and the debugging of the ultra-high voltage power transmission and transformation project is characterized by comprising a current collection module for inducing secondary current of a power transmission and transformation circuit or a main transformer and outputting a corresponding weak voltage signal; the signal acquisition module is used for sampling the voltage signal and converting the sampled signal into a data frame with a time stamp; the time-stamped data frame is sent to the user side; the current acquisition module adopts a mixed sampling probe formed by a mutual inductor coil based on Faraday law and a Hall sensor based on Hall effect, A, B and a C-phase resistor voltage-dividing network and an isolation operational amplifier; the mixed sampling probe is an open-close type current probe, and each phase of voltage signal output by the open-close type current probe is input into the signal acquisition module after passing through a A, B and C phase resistor voltage division network and an isolation operational amplifier in sequence;
the open-close type current probe comprises an openable measurement magnetic core, the Hall sensor is embedded in the magnetic core, and the transformer coil is sleeved on the magnetic core.
2. The system for wireless current collection for startup and adjustment of ultra-high voltage power transmission and transformation project according to claim 1, further comprising a power module for supplying power to the current collection system.
3. The system for wireless current collection for startup and adjustment of ultra-high voltage power transmission and transformation project according to claim 2, wherein the power module comprises a built-in lithium battery and a remote switch module, and an external power supply and the lithium battery are both connected to the remote switch module.
4. The system for wireless current collection for starting and debugging of ultra-high voltage power transmission and transformation project according to claim 1, wherein the signal collection module comprises a signal conditioning module, an analog-to-digital converter, a control collection and time scale unit and a framing and transmitting unit.
5. The system for wireless current collection for starting and debugging of ultra-high voltage power transmission and transformation project according to claim 4, wherein the control collection and time scale unit adopts a programmable system on a chip and comprises an ARM module and an FPGA module.
6. The system for collecting wireless current for starting and debugging ultra-high voltage power transmission and transformation project according to claim 4, wherein the framing and transmitting unit frames the obtained power transmission and transformation line current data and the time scale to form a data frame with a time stamp.
7. The system for collecting wireless current for starting and debugging extra-high voltage power transmission and transformation project according to claim 1, further comprising a wireless module, wherein the data frame with the timestamp is sent to a user side by the wireless module.
8. The system for collecting wireless current for starting and debugging ultra-high voltage transmission and transformation project according to claim 7, wherein the wireless module is a 5Ghz wireless bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010135716.8A CN111413893B (en) | 2020-03-02 | 2020-03-02 | Wireless current collection system for starting and debugging of ultra-high voltage power transmission and transformation project |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010135716.8A CN111413893B (en) | 2020-03-02 | 2020-03-02 | Wireless current collection system for starting and debugging of ultra-high voltage power transmission and transformation project |
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| CN111413893A CN111413893A (en) | 2020-07-14 |
| CN111413893B true CN111413893B (en) | 2023-11-03 |
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| CN113985198B (en) * | 2021-10-19 | 2023-12-15 | 国网安徽省电力有限公司电力科学研究院 | Automatic detection device for secondary protection of power transmission and transformation facility |
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