CN113884759A - Electric energy quality monitoring device - Google Patents
Electric energy quality monitoring device Download PDFInfo
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- CN113884759A CN113884759A CN202111315133.4A CN202111315133A CN113884759A CN 113884759 A CN113884759 A CN 113884759A CN 202111315133 A CN202111315133 A CN 202111315133A CN 113884759 A CN113884759 A CN 113884759A
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 22
- 238000005070 sampling Methods 0.000 claims abstract description 65
- 238000004891 communication Methods 0.000 claims abstract description 24
- 230000003993 interaction Effects 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 11
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to monitoring devices in wind power stations and photovoltaic power stations, and particularly discloses a power quality monitoring device which comprises a core control module, a power module, a communication module, an input/output module, a storage module, a human-computer interaction module and 6 sampling modules. The invention can select different current sampling modes aiming at different field conditions. Regardless of the power-off installation environment or the electrified installation environment, the appropriate current sampling mode can be selected regardless of the distance of the current signal to be sampled, and the sampling mode is flexible and changeable.
Description
Technical Field
The invention relates to monitoring devices in wind power stations and photovoltaic power stations, in particular to a power quality monitoring device in the monitoring devices.
Background
The alternating current transformer has two output types, one is a current-to-current type, and current signals are output, such as a large current transformer with a transformation ratio of 1000A to 5A (generally used for bus current sampling) and a small current transformer with a transformation ratio of 5A to 50mA (generally used for secondary side sampling of the large current transformer). The other is a current-to-voltage type, and a voltage signal is output, such as a small current transformer (generally used for secondary side sampling of a large current transformer) with 5A to 0.5V.
The power quality monitoring device generally uses two small current transformers of a 5A to 50mA current to current conversion type or a 5A to 0.5V current to voltage conversion type to sample a secondary side current signal of a large current transformer. The two small-sized current transformers are both of a built-in type and an external type.
The built-in current transformer is welded on a sampling PCB of the power quality monitoring device, a secondary side signal of the built-in current transformer is directly input into the sampling circuit, a primary side of the built-in current transformer penetrates through a through hole of the built-in current transformer through a cable, then two ends of the cable are connected onto a wiring terminal, and then the secondary side of the large current transformer is connected onto the wiring terminal.
An external current transformer generally uses an open type current transformer, the open type current transformer is clamped on a secondary side cable of a large current transformer, a secondary side signal is input to a wiring terminal of an electric energy quality monitoring device through the cable, and then the secondary side signal is input to a sampling circuit.
The power quality monitoring device using the built-in current transformer has the advantages that: the wiring is convenient and beautiful, and the precision is high; the disadvantages are that: when the installation wiring is carried out, power failure is needed, the secondary side of the large-current transformer can be opened, otherwise, the secondary opening of the large-current transformer in live operation can cause major safety accidents.
The electric energy quality monitoring device using the external current transformer has the advantages that: the device can be installed in a live mode and is not limited by conditions such as power failure plans; for the secondary signal without a large current transformer of the installation screen cabinet, the distance of current sampling can be prolonged to sample other screen cabinets; the disadvantages are that: the wiring is troublesome, and the accuracy has certain influence because the signal transmission distance is far.
Disclosure of Invention
The invention aims to provide an electric energy quality monitoring device, which can select different current sampling modes according to different field conditions. Regardless of the power-off installation environment or the electrified installation environment, the appropriate current sampling mode can be selected regardless of the distance of the current signal to be sampled, and the sampling mode is flexible and changeable.
A power quality monitoring device comprises a core control module, a power supply module, a communication module, an input/output module, a storage module, a human-computer interaction module and 6 sampling modules;
the core control module: data interaction with other modules can be carried out;
the power supply module: supplying power to other modules;
the 6 sampling modules collect voltage and current signals and send the voltage and current signals to the core control module;
the communication module is communicated with a core control module;
the switching-in and switching-out module monitors the switching value change of other equipment and can also output switching value signals to the core control module by itself;
the storage module stores the collected electric energy quality data and electric energy quality events;
the man-machine interaction module realizes man-machine interaction.
Further, the 6 sampling modules adopt built-in sampling modules or external sampling modules, and all interfaces of the built-in sampling modules or the external sampling modules are compatible.
Furthermore, the built-in sampling module and the external sampling module both adopt a plug structure.
Furthermore, a built-in sampling module is adopted, and two ends of a secondary side cable of the large current transformer are directly connected to the built-in sampling module current measurement wiring terminals of the corresponding phase.
Furthermore, an external sampling module is adopted, a secondary side cable of the large current transformer is clamped by a primary side of the external open current transformer, and two ends of the secondary side cable of the external open current transformer are connected to current measurement wiring terminals of the corresponding external sampling module.
Further, the communication module contains 4G communication, Lora communication, wired network communication, 485 communication and WIFI communication.
The invention has the following beneficial effects:
1. by using the plug-in chassis, each sampling module can be plugged and replaced, and the sampling modules can be matched according to the actual situation on site;
2. the field adaptability is strong, and the installation environment is either a power-off installation environment or a live installation environment; whether the distance of the current signal to be sampled is far or near, a proper current sampling mode can be selected;
3. the safety of equipment installation is improved, and other construction quantities increased for being compatible with different current sampling modes are reduced, such as a cable for prolonging secondary signals of a large-current transformer and the like;
4. the cost is effectively reduced, the device can be used for multiple purposes, extra cost is not needed to be spent to purchase the electric energy quality monitoring devices with two different sampling modes, the number of electric energy quality monitoring is reduced, meanwhile, the complexity of an electric energy quality monitoring system is also reduced, and the stability of the system is improved.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Fig. 2 is a schematic diagram of the built-in sampling module of the present invention.
Fig. 3 is a schematic diagram of an external sampling module according to the present invention.
Detailed Description
As shown in fig. 1, the power quality monitoring device of the present invention is composed of the following modules: the device comprises a core control module, a power supply module, a communication module, an input/output module, a storage module, a human-computer interaction module and 6 sampling modules.
A core control module: the control core of the whole equipment can perform data interaction with other modules;
a power supply module: supplying power to other modules;
a communication module: the module for communicating with the outside comprises 4G communication, Lora communication, wired network communication, 485 communication and WIFI communication;
an in-out module: monitoring the switching value change of other equipment, and outputting a switching value signal by the equipment;
a storage module: storing the collected electric energy quality data, electric energy quality events and the like;
a human-computer interaction module: the key is used for inputting parameters and setting functions, and the liquid crystal screen is mainly used for displaying data and the like;
6 sampling modules: the sampling module is used for collecting voltage and current signals, can be a built-in sampling module or an external sampling module, and all interfaces of the built-in sampling module and the external sampling module are compatible.
As shown in fig. 2, a built-in sampling module is adopted, and two ends of a secondary side cable of the large current transformer are directly connected to the corresponding built-in sampling module current measurement connection terminals. Then, the secondary side current signal of the large current transformer can generate corresponding small voltage or small current signals on the secondary side of the built-in current transformer through the primary side of the built-in current transformer, the small voltage or small current signals are processed through the sampling circuit and then transmitted to the 8-channel synchronous sampling AD chip for analog-to-digital conversion, and finally the converted data are transmitted to the core control module for calculation and analysis.
Fig. 3 shows that an external sampling module is adopted, a secondary side cable of the large current transformer is clamped by a primary side of an external open current transformer, and two ends of the secondary side cable of the external open current transformer are connected to current measurement wiring terminals of the corresponding external sampling module. Then, the secondary side current signal of the large current transformer passes through the primary side of the external current transformer, and a corresponding small voltage or small current signal is generated on the secondary side of the external current transformer. The sampling circuit processes the small voltage or small current signals, then the signals are transmitted to the 8-channel synchronous sampling AD chip for analog-to-digital conversion, and finally the converted data are transmitted to the core control module for calculation and analysis.
Particularly, the external current transformer secondary side signal transmission cable is long, so that the twisted pair cable with the shielding is used, the external interference can be reduced, and the precision is improved.
The built-in sampling module and the external sampling module have the same parameters and the same interfaces, and are only the difference of the built-in and the external arrangement of the current clamp. Therefore, the sampling module can be easily replaced through a plug-in structure, and the device is perfectly suitable for field installation environments.
Claims (6)
1. The utility model provides an electric energy quality monitoring device, characterized by includes following module: the system comprises a core control module, a power supply module, a communication module, an input/output module, a storage module, a human-computer interaction module and 6 sampling modules;
the core control module can perform data interaction with other modules;
the power supply module supplies power to other modules;
the 6 sampling modules collect voltage and current signals and send the voltage and current signals to the core control module;
the communication module is communicated with a core control module;
the switching-in and switching-out module monitors the switching value change of other equipment and can also output switching value signals to the core control module by itself;
the storage module stores the collected electric energy quality data and electric energy quality events;
the man-machine interaction module realizes man-machine interaction.
2. The power quality monitoring device according to claim 1, wherein the 6 sampling modules are internal sampling modules or external sampling modules, and all interfaces of the internal sampling modules or the external sampling modules are compatible.
3. The power quality monitoring device according to claim 2, wherein the built-in sampling module and the external sampling module are both of a plug-in structure.
4. The power quality monitoring device according to claim 3, wherein a built-in sampling module is adopted, and two ends of a secondary side cable of the large current transformer are directly connected to current measurement connection terminals of the corresponding built-in sampling module.
5. The power quality monitoring device according to claim 3, wherein an external sampling module is adopted, a secondary side cable of the large current transformer is clamped by a primary side of the external open current transformer, and two ends of the secondary side cable of the external open current transformer are connected to current measuring terminals of the external sampling module of the corresponding phase.
6. The power quality monitoring device according to claim 1, wherein the communication module comprises 4G communication, Lora communication, wired network communication, 485 communication and WIFI communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111315133.4A CN113884759A (en) | 2021-11-08 | 2021-11-08 | Electric energy quality monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111315133.4A CN113884759A (en) | 2021-11-08 | 2021-11-08 | Electric energy quality monitoring device |
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| Publication Number | Publication Date |
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| CN113884759A true CN113884759A (en) | 2022-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111315133.4A Pending CN113884759A (en) | 2021-11-08 | 2021-11-08 | Electric energy quality monitoring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115420942A (en) * | 2022-11-04 | 2022-12-02 | 浙江正泰物联技术有限公司 | Electric energy measuring device and power supply system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090327787A1 (en) * | 2008-06-26 | 2009-12-31 | Yi Gang Yu | Power monitoring device |
| CN104701988A (en) * | 2015-03-20 | 2015-06-10 | 厦门理工学院 | Intelligent controller of column switch and intelligent control method |
| CN207114664U (en) * | 2017-08-31 | 2018-03-16 | 国网辽宁省电力有限公司 | A kind of electric energy quality monitoring system |
| CN109613354A (en) * | 2018-11-19 | 2019-04-12 | 吉林科创电力有限公司 | A kind of power quality wireless monitor system and its monitoring method |
| CN209102817U (en) * | 2018-09-14 | 2019-07-12 | 广西电网有限责任公司电力科学研究院 | A kind of online Determination device of equipment for monitoring power quality |
-
2021
- 2021-11-08 CN CN202111315133.4A patent/CN113884759A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090327787A1 (en) * | 2008-06-26 | 2009-12-31 | Yi Gang Yu | Power monitoring device |
| CN104701988A (en) * | 2015-03-20 | 2015-06-10 | 厦门理工学院 | Intelligent controller of column switch and intelligent control method |
| CN207114664U (en) * | 2017-08-31 | 2018-03-16 | 国网辽宁省电力有限公司 | A kind of electric energy quality monitoring system |
| CN209102817U (en) * | 2018-09-14 | 2019-07-12 | 广西电网有限责任公司电力科学研究院 | A kind of online Determination device of equipment for monitoring power quality |
| CN109613354A (en) * | 2018-11-19 | 2019-04-12 | 吉林科创电力有限公司 | A kind of power quality wireless monitor system and its monitoring method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115420942A (en) * | 2022-11-04 | 2022-12-02 | 浙江正泰物联技术有限公司 | Electric energy measuring device and power supply system |
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Application publication date: 20220104 |