CN111600379A - Medium-voltage line variable relation identification system - Google Patents
Medium-voltage line variable relation identification system Download PDFInfo
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- CN111600379A CN111600379A CN202010154160.7A CN202010154160A CN111600379A CN 111600379 A CN111600379 A CN 111600379A CN 202010154160 A CN202010154160 A CN 202010154160A CN 111600379 A CN111600379 A CN 111600379A
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Abstract
The invention discloses a medium-voltage line variable relation recognition system which comprises a medium-voltage line variable relation recognition terminal, a medium-voltage line variable relation analyzer and a line variable relation recognition master station, wherein the medium-voltage line variable relation recognition terminal comprises a power module, a 4G communication module, a 485 communication module and a low-frequency carrier signal generation module, and the medium-voltage line variable relation analyzer comprises a power module, a 485 communication module, a 4G communication module and a low-frequency carrier signal extraction module. The system can analyze the one-to-one correspondence relationship between the 10kV power frequency transformer and the 10kV distribution line under the condition that the 10kV distribution line is not powered off, is favorable for a power supply unit to clear up disordered medium voltage line transformation relationships, achieves 10kV line loss assessment indexes, can save a large amount of labor and time investment compared with a traditional mode, and has very important significance on operation control and diagnosis of the 10kV distribution network.
Description
Technical Field
The invention relates to the field of medium-voltage power distribution systems, in particular to a medium-voltage line transformation relation identification system.
Background
The medium voltage transformation relation is an important basis for the development of services such as fault diagnosis, load switching, line loss calculation and the like in the power distribution field of a power supply unit. However, with the continuous development of power supply and distribution technologies, new 10kV power frequency transformers are continuously connected, which greatly increases the complexity of medium voltage distribution networks. In addition, medium voltage distribution lines have complex topography and various line modes, and line transformation, load switching and the like are frequently carried out in the process of construction and maintenance of the medium voltage distribution network, so that the originally clear medium voltage line transformation relation is changed continuously and is difficult to clean, and the difficulty of electric power operation and distribution business development is greatly increased. Therefore, the accurate identification of the medium voltage transformation relation has very important significance for the operation control and diagnosis of the 10kV power distribution network.
In most areas of China, population distribution is concentrated, power consumption requirements are high, 10kV power frequency transformers are increasing day by day, and the requirement of accurately clearing line variable relations needs to be solved urgently. At present, each power supply unit mainly depends on manual on-site line patrol and line cleaning variable relations one by one, but the method is time-consuming and labor-consuming, and for a cable line and a mixed line, the cable line and the mixed line are distinguished only by power failure, so that the operation difficulty is high, and huge economic loss can be caused. Since 2018, individual power supply units try to distinguish line-to-line relation by medium-voltage carrier communication, but when a high-frequency signal medium-voltage carrier signal is coupled to a 10kV distribution line, a medium-voltage carrier coupler needs to be installed, power failure is also needed, operation difficulty is high, and effective popularization cannot be achieved.
Disclosure of Invention
In view of the above-mentioned drawbacks and disadvantages of the prior art, an object of the present invention is to provide a medium voltage line transformation relationship identification system. The system can analyze the one-to-one correspondence relationship between the 10kV power frequency transformer and the 10kV distribution line under the condition that the 10kV distribution line is not powered off, is favorable for a power supply unit to clear up disordered medium voltage line variable relationships, achieves 10kV line loss examination indexes, can save a large amount of labor and time investment compared with a traditional mode, is simple and convenient to operate, and has very important significance for operation control and diagnosis of the 10kV distribution line.
In order to solve the above problems, the present invention provides a medium voltage line transformation relation recognition system, which includes a line transformation relation recognition main station, a medium voltage line transformation relation recognition terminal, and a medium voltage line transformation relation analyzer:
and the line-to-line relation identification master station sends a starting command to the medium-voltage line-to-relation identification terminal, receives a result reported by the medium-voltage line-to-relation analyzer, and generates a medium-voltage line-to-relation record after analysis processing.
The medium voltage transformation relation identification terminal comprises: the power supply module is used for providing power supply for the medium-voltage line variable relation identification terminal; the 4G communication module is used for logging in the line transformer relationship identification master station and receiving a starting command issued by the master station; the low-frequency carrier signal generating module generates a low-frequency medium-voltage carrier signal through the module; and the 485 communication module is used for local debugging.
The medium voltage transformation relation analyzer comprises: the power supply module is used for providing power supply for the medium-voltage line variable relation analyzer; the low-frequency carrier signal extraction module is used for receiving a low-frequency carrier signal with a characteristic sequence on a 10kV distribution line; the 4G communication module is used for logging in the line transformer relationship identification master station and actively reporting the low-frequency carrier signals received by the low-frequency carrier signal extraction module to the master station; the result is actively reported to the master station through the 4G module; and the 485 communication module is used for local debugging.
The system of the invention is further characterized in that:
the line-variable relation recognition master station can realize various functions of integrated file establishment, command sending, command receiving, data analysis, record generation and the like.
The medium-voltage line variable relation identification terminal power supply module supports a wide voltage range input mode, the input range is 198VAC-456VAC, and isolated 12V, 7.2V, 5V and 3.3V direct-current voltages are output.
The medium voltage transformer relation analysis machine power supply is compatible with an alternating current-direct current input mode, the input range is 90VAC-286VAC or 20VDC-60VDC, and isolated 15V, 5.2V and 3.3V direct current voltages are output.
The medium-voltage line transformation relation identification terminal low-frequency carrier signal generation module can generate low-frequency carrier signals with different signal intensities and different signal frequencies, directly pass through a 10kV power frequency transformer and have characteristic sequences. The signal strength is determined by duty ratio, supporting 3/8, 4/8 and 5/8, and the signal frequency supporting 625Hz and 825 Hz. Aiming at a complex distribution line environment, the low-frequency carrier signal generation module can accept master station scheduling or self-adjusting frequency and duty ratio.
The low-frequency carrier signal extraction module of the medium-voltage line variable relation analyzer is externally connected with a CT coil, has a non-contact small signal extraction technology and carrier encoding, frequency discrimination, decoding and error correction technologies, and can accurately extract low-frequency carrier signals with characteristic sequences. Aiming at complex distribution line environment, the low-frequency carrier signal extraction module can simultaneously analyze and report the background noise intensity.
Compared with the traditional manual power failure method and the existing medium-voltage carrier communication technology, the method has the following advantages:
the medium-voltage line transformation relation recognition system comprises a medium-voltage line transformation relation recognition terminal, a medium-voltage line transformation relation analysis machine and a line transformation relation recognition main station, wherein the medium-voltage line transformation relation recognition terminal is installed on a low-voltage side, so that a low-frequency medium-voltage carrier signal can be generated and directly penetrates through a transformer to a 10kV distribution line, the medium-voltage line transformation relation analysis machine adopts a non-contact small signal extraction technology, the low-frequency medium-voltage carrier signal can be directly extracted from the 10kV distribution line, the one-to-one corresponding relation of the 10kV power frequency transformer and the 10kV distribution line is analyzed under the condition that the 10kV distribution line is not powered off, the disordered medium-voltage line transformation relation of a power supply unit is cleared, the 10kV line loss index is achieved, and the system has very important significance for operation control and diagnosis of the 10kV distribution line. Compared with the traditional manual power-off method, the method saves a large amount of labor and time investment and has economical efficiency; compared with the existing medium-voltage carrier communication technology, the medium-voltage carrier communication method has the advantages of no need of power failure of a 10kV distribution line, simplicity in installation, small danger coefficient, universality and popularization value.
Drawings
FIG. 1 is a block diagram of a system for recognizing a voltage-tapping relationship according to the present invention.
Detailed Description
The present invention will be further described with reference to fig. 1 and the embodiments, so as to specifically describe the system scheme of the present invention. The following examples are only for illustrating the system scheme of the present invention more clearly, and should not be taken as limiting the scope of the present invention.
As shown in fig. 1, a medium voltage line variation relation recognition system of the present invention includes the following components:
the medium-voltage line transformer relation recognition system comprises a medium-voltage line transformer relation recognition terminal, a medium-voltage line transformer relation analysis machine and a line transformer relation recognition main station, wherein the medium-voltage line transformer recognition terminal comprises a power module, a 4G communication module, a 485 communication module and a low-frequency carrier signal generation module, and the medium-voltage line transformer relation analysis machine comprises a power module, a 485 communication module, a 4G communication module and a low-frequency carrier signal extraction module.
The medium voltage transformer relation identification terminal logs in a line transformer relation identification main station through a 4G communication module by virtue of the function of a power module, and after receiving a starting command issued by the main station, a low-frequency carrier signal generation module generates a low-frequency medium voltage carrier signal, and the medium voltage transformer relation identification terminal is provided with a 485 communication module for local debugging. Wherein:
the medium-voltage line variable relation identification terminal power supply module supports a wide voltage range input mode, the input range is 198VAC-456VAC, and isolated 12V, 7.2V, 5V and 3.3V direct-current voltages are output.
The 485 communication module of the medium-voltage line-transformer relation identification terminal adopts a TC485H chip with low power consumption, wide voltage input and high voltage self-stabilization, and has the highest communication speed of 115200 bps.
The 4G communication module of the medium-voltage line transformation relation identification terminal adopts an EC20CEHB full-network communication module and supports the maximum downlink rate of 75Nbps and the maximum uplink rate of 50 Mbps.
The medium-voltage line transformation relation identification terminal low-frequency carrier signal generation module can generate low-frequency carrier signals with different signal intensities and different signal frequencies, directly pass through a 10kV power frequency transformer and have characteristic sequences. The signal strength is determined by duty ratio, supporting 3/8, 4/8 and 5/8, and the signal frequency supporting 625Hz and 825 Hz. Aiming at a complex distribution line environment, the low-frequency carrier signal generation module can accept master station scheduling or self-adjusting frequency and duty ratio.
The medium voltage transformer relation analyzer logs in a main station for identifying the line transformer relation through a 4G communication module by the function of a power module, a low-frequency carrier signal extraction module actively reports a result to the main station through the 4G communication module after receiving a low-frequency carrier signal with a characteristic sequence on a 10kV distribution line, and the medium voltage transformer relation analyzer is provided with a 485 communication module for local debugging. Wherein:
the medium voltage transformer relation analysis machine power supply module is compatible with an alternating current-direct current input mode, inputs the voltage range of 90VAC-286VAC or 20VDC-60VDC, and outputs isolated 15V, 5.2V and 3.3V direct current voltages;
the 485 communication module of the medium-voltage line transformer relation analyzer adopts a TC485H chip with low power consumption, wide voltage input and high voltage self-stabilization, and the highest communication speed is 115200 bps;
the 4G communication module of the medium voltage transformer relation analyzer adopts an EC20CEHB full-network communication module and supports the maximum downlink rate of 75Nbps and the maximum uplink rate of 50 Mbps;
the low-frequency carrier signal extraction module of the medium-voltage line variable relation analyzer is externally connected with a CT coil, has a non-contact small signal extraction technology and carrier encoding, frequency discrimination, decoding and error correction technologies, and can accurately extract low-frequency carrier signals with characteristic sequences. Aiming at complex distribution line environment, the low-frequency carrier signal extraction module can simultaneously analyze and report the background noise intensity.
The line-to-line variable relation recognition main station integrates various functions of file establishment, command sending, command receiving, data analysis, record generation and the like, and realizes the purposes of sending a starting command to a medium-voltage line-to-line variable relation recognition terminal, receiving a reported result of a medium-voltage line-to-line variable relation analyzer and generating a medium-voltage line-to-line variable relation record after analysis processing.
The medium-voltage line variable relation system specifically works as follows:
selecting two 10kV hand-in-hand lines of 1 transformer substation and 1 transformer under each of the two lines;
the medium voltage line transformation relation identification terminal 1 and the medium voltage line transformation relation identification terminal 2 are respectively installed on the low voltage sides of the 10kV power frequency transformer 1 and the transformer 2, electricity is taken at A, B two-phase 380VAC, and terminal addresses are recorded;
the medium-voltage line transformation relation analyzer 1 and the medium-voltage line transformation relation analyzer 2 are installed in a transformer substation, power is supplied to the AC220V, CT coils are respectively clamped on the phase A of a CT secondary side current line of a 10kV line 1 and a CT secondary side current line of a 10kV line 2, and the address and the CT transformation ratio of the analyzers are recorded;
after a line transformer relation identification master station establishes a file according to a transformer name, a 10kV line name, a terminal address, an analyzer address and a CT transformation ratio, setting to send a starting command to perform patrol every 1 hour;
after 3 rounds of patrol detection, the load is switched, all the transformers under the 10kV line 2 are switched to be powered by the 10kV line 1, and the patrol detection is continued for 3 rounds;
after 6 hours, the online transformer relation identification master station can inquire that the first 3 times of online transformer recording transformer 1 belongs to the 10kV line 1 and the transformer 2 belongs to the 10kV line 2; and the last 3-time line-to-line-change recording transformer 1 and the transformer 2 both belong to a 10kV line 1.
In the embodiment, the medium voltage line variable relation identification system is tested and verified by using field actual operation. The medium voltage transformer relation recognition system can analyze the one-to-one correspondence relation between the 10kV power frequency transformer and the 10kV distribution line under the condition that the 10kV distribution line is not powered off, and is simple, efficient and accurate.
The above embodiments are illustrative of specific embodiments of the present invention, and are not restrictive of the present invention, and those skilled in the relevant art can make various changes and modifications without departing from the spirit and scope of the present invention to obtain corresponding equivalent technical solutions, and therefore all equivalent technical solutions should be included in the scope of the present invention.
Claims (8)
1. The medium-voltage line-to-line relation identification system is characterized by comprising a line-to-line relation identification main station, a medium-voltage line-to-line relation identification terminal and a medium-voltage line-to-line relation analyzer:
the line-to-line relation identification master station sends a starting command to the medium-voltage line-to-relation identification terminal, receives a result reported by the medium-voltage line-to-relation analyzer, and generates a medium-voltage line-to-relation record after analysis processing;
well line pressure becomes relation identification terminal, includes: the power supply module is used for providing power supply for the medium-voltage line variable relation identification terminal; the 4G communication module is used for logging in the line transformer relationship identification master station and receiving a starting command issued by the master station; the low-frequency carrier signal generating module generates a low-frequency medium-voltage carrier signal through the module; the 485 communication module is used for local debugging;
well line pressure becomes relation analysis machine includes: the power supply module is used for providing power supply for the medium-voltage line variable relation analyzer; the low-frequency carrier signal extraction module is used for receiving a low-frequency carrier signal with a characteristic sequence on a 10kV distribution line; the 4G communication module is used for logging in the line transformer relationship identification master station and actively reporting the low-frequency carrier signals received by the low-frequency carrier signal extraction module to the master station; the result is actively reported to the master station through the 4G module; and the 485 communication module is used for local debugging.
2. The medium voltage line-to-line relation recognition system as claimed in claim 1, wherein the line-to-line relation recognition master station is capable of implementing various functions such as integrated file creation, command transmission, command reception, data analysis, record generation, and the like.
3. The system of claim 1, wherein the medium voltage line transformation relationship recognition terminal power module supports a wide voltage range input mode, an input range of 198VAC-456VAC, and outputs isolated 12V, 7.2V, 5V, and 3.3V direct current voltages.
4. The medium voltage line-to-line variable relation identification system as claimed in claim 1, wherein the medium voltage line-to-line variable relation analysis machine power module is compatible with an alternating current and direct current input mode, has an input range of 90VAC-286VAC or 20VDC-60VDC, and outputs isolated 15V, 5.2V and 3.3V direct current voltages.
5. The medium voltage line variation relation recognition system as claimed in claim 1, wherein the 485 communication module employs a low power consumption, wide voltage input, high voltage self-regulated TC485H chip, with a maximum communication rate of 115200 bps.
6. The medium voltage line transformer relationship identification system of claim 1, wherein the 4G communication module adopts an EC20CEHB full network communication module, and supports a maximum downlink rate of 75Mbps and a maximum uplink rate of 50 Mbps.
7. The medium-voltage line transformation relation recognition system as claimed in claim 1, wherein the medium-voltage line transformation relation recognition terminal low-frequency carrier signal generation module can generate low-frequency carrier signals with different signal intensities, different signal frequencies, direct passing through a 10kV power frequency transformer, and having a characteristic sequence. The signal strength is determined by duty ratio, supporting 3/8, 4/8 and 5/8, and the signal frequency supporting 625Hz and 825 Hz. Aiming at a complex distribution line environment, the low-frequency carrier signal generation module can accept master station scheduling or self-adjusting frequency and duty ratio.
8. The system for identifying medium voltage line variable relationship as claimed in claim 1, wherein the low frequency carrier signal extraction module of the medium voltage line variable relationship analyzer is externally connected with a CT coil, and has a non-contact small signal extraction technology, a carrier encoding technology, a carrier frequency discrimination technology, a decoding technology and an error correction technology, so that the low frequency carrier signal with a characteristic sequence can be accurately extracted. Aiming at complex distribution line environment, the low-frequency carrier signal extraction module can simultaneously analyze and report the background noise intensity.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112213578A (en) * | 2020-09-23 | 2021-01-12 | 青岛鼎信通讯股份有限公司 | Medium voltage line variable relation identification method |
| CN112765058A (en) * | 2020-12-22 | 2021-05-07 | 青岛鼎信通讯股份有限公司 | Intelligent platform area fusion terminal for line transformer identification |
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2020
- 2020-03-07 CN CN202010154160.7A patent/CN111600379A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112213578A (en) * | 2020-09-23 | 2021-01-12 | 青岛鼎信通讯股份有限公司 | Medium voltage line variable relation identification method |
| CN112765058A (en) * | 2020-12-22 | 2021-05-07 | 青岛鼎信通讯股份有限公司 | Intelligent platform area fusion terminal for line transformer identification |
| CN112765058B (en) * | 2020-12-22 | 2022-06-07 | 青岛鼎信通讯股份有限公司 | Intelligent platform area fusion terminal for line transformer identification |
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