CN111948486A - Automatic identification device and method for distribution room topology of low-voltage power line carrier transmission - Google Patents
Automatic identification device and method for distribution room topology of low-voltage power line carrier transmission Download PDFInfo
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- CN111948486A CN111948486A CN202010630593.5A CN202010630593A CN111948486A CN 111948486 A CN111948486 A CN 111948486A CN 202010630593 A CN202010630593 A CN 202010630593A CN 111948486 A CN111948486 A CN 111948486A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 21
- 230000005611 electricity Effects 0.000 claims abstract description 23
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 9
- 230000001131 transforming Effects 0.000 claims description 12
- 238000004891 communication Methods 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 1
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Classifications
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R13/00—Arrangements for displaying electric variables or waveforms
- G01R13/02—Arrangements for displaying electric variables or waveforms for displaying measured electric variables in digital form
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
Abstract
The invention discloses a device and a method for automatically identifying a platform area topology of low-voltage power line carrier transmission, belonging to the field of national grid security facilities. The system comprises a host and slave machines, wherein each electric meter is provided with one slave machine, and the slave machines send rectangular waves to the power supply side of the electric meter and send triangular waves to the load side of the electric meter; the host reads the rectangular wave on the power line, displays the rectangular wave through a liquid crystal screen after decoding, and transmits the rectangular wave to the intelligent distribution transformer terminal through a 485 line by using a fixed point table. The invention has low cost and good economic benefit, and solves the problems that the transformer supplies power to certain electricity meters in topology, the transformer comes from which electricity and the electricity is not the electricity consumption.
Description
Technical Field
The invention provides a device and a method for automatically identifying a platform area topology of low-voltage power line carrier transmission, belonging to the field of national grid security facilities.
Background
The low-voltage power line carrier communication means that the existing low-voltage distribution line is used as a transmission medium to realize data transmission and information exchange. The earliest examples of the use of power lines to transmit signals were power line telephones, which were used within the same power line, using a power carrier transmitter to transmit electrical signals to the power line and a carrier receiver to filter the electrical signals from the power line. The carrier communication technology is mature on a high-voltage power line of more than 10kV, but the information transmission technology on a low-voltage power network is not mature or reaches a fully practical stage.
Low voltage power lines are laid for transmitting power frequency signals, are a very widely distributed line resource, and people have long attempted to transmit data or voice signals through the low voltage power lines. Because the communication is not laid, the characteristics of the communication are difficult to directly meet the requirements of carrier communication, and the communication is mainly embodied in two aspects:
(1) the impedance characteristics of the power network and its attenuation limit the transmission distance of the signal, which is related to the physical length of the communication channel and the impedance matching of the low voltage network.
(2) Noise interference on low voltage power lines limits the transmission quality of the signal. Noise interference mainly comes from loads connected to the low voltage grid, and radio interference. In such a severe power line communication environment, it is difficult to ensure the quality of data transmission, and it is difficult to find out the change law of noise and signal attenuation of power line communication, so when transmitting signals by using a power line, the signals must be processed to a certain extent and go through the whole process from signal transmission to signal reception, which is the key point and difficulty involved in the power line carrier communication technology.
Disclosure of Invention
The invention aims to provide a device and a method for automatically identifying the topology of a distribution room for low-voltage power line carrier transmission, which can overcome the defects so as to solve the problems.
The invention relates to a station area topology automatic identification device for low-voltage power line carrier transmission, which comprises a host and a slave,
each electric meter is provided with a slave machine, and the slave machine sends rectangular waves to the power supply side of the electric meter and sends triangular waves to the load side of the electric meter; the host reads the rectangular wave on the power line, displays the rectangular wave through a liquid crystal screen after decoding, and transmits the rectangular wave to the intelligent distribution transformer terminal through a 485 line by using a fixed point table.
Preferably, the waveforms generated by the slave are respectively connected to a live wire inlet end on the power supply side of the electric meter and a live wire outlet end on the load side.
Preferably, each slave machine generates different high-frequency waveforms, and the rectangular waves under the same transformer have the same amplitude and different frequencies; the triangular wave amplitude value at each user meter is different, and the frequency is the same.
Preferably, the master computer receives the slave computer waveform to generate a 'change-to-home' relationship topological graph and transmits the topological graph to the intelligent distribution transformer terminal for use.
Preferably, the intelligent distribution and transformation terminal uploads the topological relation to the power supply service command system to share the topological relation.
Preferably, a high-frequency wave trapper is arranged between the electric meter and the low-voltage outgoing switch, a host is arranged between the low-voltage outgoing switch and the transformer, and the host is connected with the intelligent distribution transformer terminal.
The method for automatically identifying the topology of the transformer area transmitted by the carrier waves of the low-voltage power line comprises the following steps:
step 1, sending a rectangular wave from a slave to a power supply side of an ammeter and sending a triangular wave to an electric load side of the ammeter;
step 2, the host reads a rectangular carrier and a triangular carrier on the power line;
step 3, the host can display the decoded rectangular carrier waves and triangular waveforms through a liquid crystal screen, generate a variable-user relation topological graph and transmit the variable-user relation topological graph to the intelligent distribution transformer terminal through a 485 line;
and 4, the intelligent distribution and transformation terminal uploads the topological relation to the power supply service command system and shares the topological relation.
Preferably, the rectangular wave frequency corresponds to the serial number of a transformer, and the triangular wave corresponds to the asset number of an electric meter;
the waveform on the power line is read through the oscilloscope, and whether electricity is stolen or not and a power failure notice is given out are respectively judged through the identification of the triangular wave and the rectangular wave.
Compared with the prior art, the invention has the beneficial effects that:
(1) and the manufacturing cost is low. Because the existing power distribution network is effectively utilized as a transmission line, no extra line needs to be laid, thereby greatly reducing the line investment and saving the cost.
(2) And the economic benefit is good. The topology identification is realized by adopting a carrier technology, the list details of all low-voltage users carried by a certain transformer can be automatically displayed, a dynamic transformer area line loss basic account is established, and the problem of topology of power supply of the transformer to which electric meters is solved. The method is used for accurately judging the user distribution areas and the mutual attributes, accurately and quickly checking various distribution areas, can save a large amount of manpower and material resources, and is beneficial to line loss management.
(3) The problems that the transformer supplies power to which electricity meters, the transformer supplies power from which electricity, and electricity is not the electricity for charging are solved.
Drawings
FIG. 1 is a schematic connection diagram of the present invention;
FIG. 2 is a flow chart of the inventive method.
FIG. 3 is an electrical schematic of a slave;
fig. 4 is an electrical schematic of the host machine.
Detailed Description
Example 1
The invention is further illustrated in the following figures 1-2, in conjunction with the accompanying drawings: the invention relates to a station area topology automatic identification device for low-voltage power line carrier transmission, which comprises a host and a slave,
each electric meter is provided with a slave machine, and the slave machine sends rectangular waves to the power supply side of the electric meter and sends triangular waves to the load side of the electric meter; the host reads the rectangular wave on the power line, displays the rectangular wave through a liquid crystal screen after decoding, and transmits the rectangular wave to the intelligent distribution transformer terminal through a 485 line by using a fixed point table. The waveforms generated by the slave machine are respectively connected to a live wire inlet end at the power supply side of the electric meter and a live wire outlet end at the load side. Each slave machine generates different high-frequency waveforms, and the rectangular wave amplitude values and the frequencies under the same transformer are different; the triangular wave amplitude value at each user meter is different, and the frequency is the same. And the master machine receives the slave machine waveform to generate a 'change-user' relation topological graph and transmits the topological graph to the intelligent distribution transformer terminal for use. And the intelligent distribution and transformation terminal uploads the topological relation to the power supply service command system and shares the topological relation. A high-frequency wave trapper is arranged between the ammeter and the low-voltage outgoing switch, a host is arranged between the low-voltage outgoing switch and the transformer, and the host is connected with the intelligent distribution transformer terminal.
The slave machine comprises a sending processor, a three-phase power frequency signal sampling circuit and a three-phase pulse generating circuit, wherein the input end of the three-phase power frequency signal sampling circuit is connected with the three-phase voltage at the low-voltage side of the transformer area, the output end of the three-phase power frequency signal sampling circuit is connected with the input end of the sending processor, the input end of the three-phase pulse generating circuit is connected with the output end of the sending processor, and the output end of the three-phase pulse is connected.
The three-phase power frequency signal sampling circuit comprises three voltage waveform and zero-crossing acquisition units, each voltage waveform and zero-crossing acquisition unit comprises a voltage transformer at a sending end, a NOT gate and two operational amplifiers, and the input end of the voltage transformer at the sending end is connected with the phase voltage at the low-voltage side of a transformer in a transformer area; the first operational amplifier is connected into a voltage follower, the input end of the voltage follower is connected with the output end of the voltage transformer at the sending end, and the output end of the voltage follower is connected with the input port of the processor; the second operational amplifier is connected into a comparator, two input ends of the comparator are respectively connected with two output ends of the voltage transformer at the transmitting end, and the output ends are connected with an input port of the processor through a NOT gate.
The three-phase pulse generating circuit comprises three pulse generating units, each pulse generating unit comprises a triode, a photoelectric coupler, a controlled silicon and an inductor, the base electrode of the triode is connected with the output port of the processor through a coupling resistor, the collector electrode of the triode is connected with the positive electrode of a power supply, the emitter electrode of the triode is grounded through a light emitting diode in the photoelectric coupler, the controlled silicon is connected in series with the inductor and then connected between the corresponding phase line and the zero line, and the control electrode of the controlled silicon is connected with the positive electrode of the power supply through the photoelectric tube in the photoelectric coupler.
The host comprises a receiving processor and three receiving units, wherein each receiving unit comprises a receiving end voltage transformer and a third operational amplifier, the input end of the receiving end voltage transformer is connected with the voltage of the wire inlet end of the user electric energy meter, the third operational amplifier is connected into a voltage follower, the input end of the third operational amplifier is connected with the output end of the receiving end voltage transformer, and the output end of the third operational amplifier is connected with the input port of the receiving processor.
A method for automatically identifying a distribution room topology transmitted by low-voltage power line carriers comprises the following steps:
step 1, sending a rectangular wave from a slave to a power supply side of an ammeter and sending a triangular wave to an electric load side of the ammeter;
step 2, the host reads a rectangular carrier and a triangular carrier on the power line;
step 3, the host can display the decoded rectangular carrier waves and triangular waveforms through a liquid crystal screen, generate a variable-user relation topological graph and transmit the variable-user relation topological graph to the intelligent distribution transformer terminal through a 485 line;
and 4, the intelligent distribution and transformation terminal uploads the topological relation to the power supply service command system and shares the topological relation.
Preferably, the rectangular wave frequency corresponds to the serial number of a transformer, and the triangular wave corresponds to the asset number of an electric meter;
the waveform on the power line is read through the oscilloscope, and whether electricity is stolen or not and a power failure notice is given out are respectively judged through the identification of the triangular wave and the rectangular wave.
The host can receive and transmit carrier signals, the variable-user relation topological graph in the host can be transmitted to the intelligent distribution and transformation terminal for use, the slave can only transmit the carrier signals, and all the carrier signals have different frequencies.
The device can automatically display all low-voltage user details carried by a certain transformer, establish a dynamic transformer area line loss basic account, conveniently reduce the management line loss, and solve the problem of power supply topology of the transformer for electric meters. The slave machines can generate different high-frequency waveforms and send rectangular waves to the power supply side of the electric meter, and the rectangular waves under the same transformer have the same amplitude and different frequencies. And a slave is arranged at each electric meter, and waveforms generated by the slave are respectively connected to 1 hole (live wire inlet wire, power supply side) and 2 holes (live wire outlet wire, load side) of the household meter. The host can read rectangular carrier waves on the power line, the rectangular carrier waves can be displayed through the liquid crystal screen after being decoded, the rectangular carrier waves are transmitted to the intelligent distribution and transformation terminal through the 485 line by the fixed point meter, the distribution and transformation terminal can know which electric meters are arranged below the transformer, and the distribution and transformation terminal uploads the topological relation to the power supply service command system to share the topological relation.
The distribution transformer terminal automatically displays all low-voltage user details carried by a certain transformer, establishes a dynamic transformer area line loss basic account, conveniently reduces the management line loss, and solves the problem of power supply topology of the transformer for electric meters.
The slave machines can generate different high-frequency waveforms, send rectangular waves to the power supply side of the electric meter and send triangular waves to the electric load side of the electric meter, and the rectangular waves under the same transformer have the same amplitude and different frequencies; the triangular waveform at each meter is different but the same frequency (each transformer is identified with a unique frequency) and represents the asset number of the meter. And a slave is arranged at each electric meter, and waveforms generated by the slave are respectively connected to 1 hole (live wire inlet wire, power supply side) and 2 holes (live wire outlet wire, load side) of the household meter.
The host can read rectangular carrier waves on the power line, the rectangular carrier waves can be displayed through the liquid crystal screen after being decoded, the rectangular carrier waves are transmitted to the intelligent distribution and transformation terminal through the 485 line by the fixed point meter, the distribution and transformation terminal can know which electric meters are arranged below the transformer, and the distribution and transformation terminal uploads the topological relation to the power supply service command system to share the topological relation.
The electricity that uses test pencil anytime and anywhere to look over low voltage electric wire (cable) comes from which transformer, and the convenient accuracy notice of having a power failure solves "the problem that electricity comes from which transformer".
High frequency wave traps are an important component of power carrier communication systems. The power line is used for transmitting signals of high-frequency protection and high-frequency communication to form a channel, and the high-frequency signals are prevented from being transmitted to other directions, so that the reliable operation of a power line carrier communication system is ensured; meanwhile, the high-frequency wave trap can also inhibit the shunting influence of a transformer substation on a carrier system, and does not influence the normal transmission of 50Hz power frequency current. The high-frequency wave trap works under strong power frequency current and may be influenced by bad weather, so that the phenomena of breakdown, discharge, burning and the like of internal elements can be caused. So it is very important to test the performance parameters of the high frequency wave trap periodically.
The special test pencil is used for checking whether electricity for any low-voltage electrical equipment is charged through the electricity meter at any time and any place, electricity stealing is conveniently checked, and the problem that electricity is not charged is solved.
The rectangular wave frequency corresponds to the serial number of the transformer, the rectangular wave corresponds to the asset number of the electric meter, and the topological relation is solved; the existence of rectangular waves and no triangular waves represents electricity stealing, and the line loss is reduced; the triangular frequency corresponds to the number of the transformer, the triangular waveform corresponds to the asset number of the electric meter, and the power failure notification is accurately carried out. The electricity testing pen is portable, is similar to the existing low-voltage electricity testing pen, has an electricity testing function, can identify waveforms, indicates that the electric energy is not charged by an ammeter if the electricity testing pen does not detect a triangular waveform, is electricity stealing, can judge which transformer is stolen through rectangular waves, and is convenient for line loss treatment; and secondly, the power failure notification is convenient to be carried out by identifying the frequency of the triangular wave and determining which transformer the power comes from, and the power failure notification method is particularly suitable for accurate power failure notification of a station area with circuitous power supply in an old cell, and can be judged by testing with a test pencil when the power failure notification is not determined to be carried out for some rooms along the street.
Claims (8)
1. An automatic identification device for the distribution area topology of low-voltage power line carrier transmission is characterized by comprising a host and a slave,
each electric meter is provided with a slave machine, and the slave machine sends rectangular waves to the power supply side of the electric meter and sends triangular waves to the load side of the electric meter; the host reads the rectangular wave on the power line, displays the rectangular wave through a liquid crystal screen after decoding, and transmits the rectangular wave to the intelligent distribution transformer terminal through a 485 line by using a fixed point table.
2. The automatic station topology identification device for low-voltage power line carrier transmission according to claim 1, wherein the waveforms generated by the slave are respectively connected to a live wire inlet terminal at the power supply side of the electric meter and a live wire outlet terminal at the load side.
3. The automatic station area topology identification device for low-voltage power line carrier transmission according to claim 1, wherein each slave machine generates different high-frequency waveforms, and rectangular waves of the same transformer have the same amplitude and different frequencies; the triangular wave amplitude value at each user meter is different, and the frequency is the same.
4. The automatic identification device for the distribution area topology transmitted by the low-voltage power line carrier according to claim 1, wherein a change-to-home relationship topology map is generated in the master by receiving the slave waveform and is transmitted to the intelligent distribution transformer terminal for use.
5. The automatic identification device for the distribution area topology of the low-voltage power line carrier transmission according to claim 1, wherein the intelligent distribution terminal uploads the topology relationship to the power supply service command system to share the topology relationship.
6. The automatic identification device for the distribution room topology of the carrier transmission of the low voltage power line according to claim 1, wherein a high frequency wave trap is provided between the electric meter and the low voltage outgoing switch, a host is provided between the low voltage outgoing switch and the transformer, and the host is connected with the intelligent distribution transformer terminal.
7. The automatic identification method for the topology of a distribution room transmitted by a low voltage power line carrier according to claims 1-6, characterized by comprising the following steps:
step 1, sending a rectangular wave from a slave to a power supply side of an ammeter and sending a triangular wave to an electric load side of the ammeter;
step 2, the host reads a rectangular carrier and a triangular carrier on the power line;
step 3, the host can display the decoded rectangular carrier waves and triangular waveforms through a liquid crystal screen, generate a variable-user relation topological graph and transmit the variable-user relation topological graph to the intelligent distribution transformer terminal through a 485 line;
and 4, the intelligent distribution and transformation terminal uploads the topological relation to the power supply service command system and shares the topological relation.
8. The method according to claim 6, wherein the rectangular wave frequency corresponds to the number of a transformer, and the triangular wave corresponds to the asset number of an electric meter;
the waveform on the power line is read through the oscilloscope, and whether electricity is stolen or not and a power failure notice is given out are respectively judged through the identification of the triangular wave and the rectangular wave.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010630593.5A CN111948486A (en) | 2020-07-03 | 2020-07-03 | Automatic identification device and method for distribution room topology of low-voltage power line carrier transmission |
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| CN202010630593.5A CN111948486A (en) | 2020-07-03 | 2020-07-03 | Automatic identification device and method for distribution room topology of low-voltage power line carrier transmission |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111987795A (en) * | 2020-07-27 | 2020-11-24 | 国网福建省电力有限公司 | Power distribution low-voltage branch line monitoring system and method based on Internet of things |
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2020
- 2020-07-03 CN CN202010630593.5A patent/CN111948486A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111987795A (en) * | 2020-07-27 | 2020-11-24 | 国网福建省电力有限公司 | Power distribution low-voltage branch line monitoring system and method based on Internet of things |
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