CN111935055A - Low-frequency medium-voltage carrier signal generating device for line-to-line relation recognition - Google Patents
Low-frequency medium-voltage carrier signal generating device for line-to-line relation recognition Download PDFInfo
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- CN111935055A CN111935055A CN202010771611.1A CN202010771611A CN111935055A CN 111935055 A CN111935055 A CN 111935055A CN 202010771611 A CN202010771611 A CN 202010771611A CN 111935055 A CN111935055 A CN 111935055A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
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- Computer Networks & Wireless Communication (AREA)
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention discloses a low-frequency medium-voltage carrier signal generating device for identifying line-variable relations, which comprises a power supply module, a remote communication module, a 485 communication module, a control module, a driving module, a low-frequency carrier signal generating module and a zero-crossing detection module, wherein the low-frequency medium-voltage carrier signal generating device is powered by the power supply module, receives a control command through the remote communication module or the 485 communication module, receives the command and then combines a zero-crossing signal of the zero-crossing detection module to output a control signal to the driving module, the low-frequency medium-voltage carrier signal generating module generates a low-frequency medium-voltage carrier signal, the frequency range of the output signal is 20Hz-2KHz, the low-frequency medium-voltage carrier signal can directly penetrate through a power frequency transformer to be transmitted on a 10kV power line, the frequency of the signal is determined by the frequency of. Compared with the conventional medium-voltage carrier communication device, the device can clear line variable relations and simply measure distance under the condition that a 10kV line is not powered off, and is simple, efficient and accurate.
Description
Technical Field
The invention relates to the field of medium-voltage power distribution systems, in particular to a low-frequency medium-voltage carrier signal generating device for identifying a line-to-line relation.
Background
Theoretical test research shows that the carrier signal which can directly penetrate through the power frequency transformer for long-distance transmission can not exceed 2kHz, the frequency of the carrier signal is 200kHz-12MHz in a traditional medium-voltage carrier communication device, a medium-voltage carrier signal coupling device needs to be additionally arranged for long-distance transmission of the carrier signal on a 10kV line, the 10kV line needs to be installed in a power failure mode, and construction conditions are relatively difficult; in addition, under the condition of low frequency, the line impedance is low, the internal resistance of the traditional carrier sending circuit cannot be very small, the carrier signal feed network efficiency is extremely low, and the long-distance transmission of low-frequency carrier signals cannot be realized.
The power distribution network lines in China are complex, the line change relation of the 10kV lines is disordered, effective means are not available for distinguishing at present, judgment can be carried out only through manual line patrol or manual power failure, the efficiency is low, the difficulty is high, economic loss is easy to cause, and under the complex power distribution network environment, the distance data of the 10kV lines are also fuzzy; at present, a mainstream medium-voltage carrier communication device can realize 10kV line variable relation identification and 10kV line ranging, but as mentioned above, 10kV line power failure installation is needed, the operation difficulty is high, and batch popularization cannot be realized.
Disclosure of Invention
Aiming at the defects or shortcomings in the prior art, the invention aims to provide a low-frequency medium-voltage carrier signal generating device for identifying line-to-line variable relations, which can send a low-frequency medium-voltage carrier signal of 20Hz-2KHz on a low-voltage side and directly penetrate through a power frequency transformer to transmit on a 10kV line. Compared with the conventional medium-voltage carrier communication device, the device is not required to be installed in a 10kV line power failure mode, low-frequency signals are shunted little, and the line-to-line relation judgment and 10kV line distance measurement effects of the 10kV line are huge.
In order to solve the above problems, the present invention provides a low frequency medium voltage carrier signal generating device for line-variant relation identification, the generating device comprising: the low-frequency medium-voltage carrier wave signal generating device is powered by the power supply module, receives a control command through the remote communication module or the 485 communication module, combines a zero-crossing signal of the zero-crossing detection module after receiving the command, outputs the control signal to the driving module, and generates a low-frequency medium-voltage carrier wave signal through the low-frequency medium-voltage carrier wave signal generating module; the signal frequency range is 20Hz-2KHz, the signal can directly penetrate through the power frequency transformer to be transmitted on a 10kV power line, the frequency is determined by the frequency of the control signal output by the control unit, and the signal intensity is determined by the duty ratio of the control signal.
The power module adopts an isolated switch power supply, has wide input voltage range, supports the input range of 176VAC-456VAC, and can output isolated 12V, 7.2V, 5V, 3.3V, 16V and-8V direct-current voltages for normal work of all sub-modules of the device.
The remote communication module is compatible with 4G and NB-IoT full-network communication, and can remotely receive a control command and a debugging command after logging in a designated server.
The 485 communication module adopts a 485 chip with low power consumption, wide voltage input and high voltage self-stabilization, and has the highest communication speed of 115200 bps.
The control module core adopts a high-performance PIC32MX series 32-bit microcontroller, and can output PWM control signals with different frequencies and different duty ratios according to a control command and a zero-crossing signal, wherein the frequency range is 20H-2kHz, and the duty ratio range is 1/8-7/8.
The driving module core adopts a multifunctional integrated driving optocoupler ACPL-332J, has 2.5A output current driving capability, outputs-8V and +16VPWM driving signals with the same frequency and the same duty ratio as the control unit, and has a fault detection self-locking function.
The zero-crossing detection module is compatible with phase voltage zero-crossing signal detection and line voltage zero-crossing signal detection.
The low-frequency carrier signal generation module consists of a high-performance rectifier bridge, a safety capacitor, a resistor, a TVS (transient voltage suppressor) tube and an IGBT (insulated gate bipolar transistor), and outputs characteristic low-frequency carrier signals according to driving signals with different frequencies and different duty ratios.
The invention has the beneficial effects that: utilize low frequency middling pressure carrier signal generating device can realize under the circumstances that 10kV circuit does not have a power failure, clear up the line and become the relation and simply range finding, and simple high efficiency is accurate, reduces a large amount of manpowers, material resources extravagant.
Drawings
Fig. 1 is a system block diagram of a low-frequency medium-voltage carrier signal generating device 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, the invention relates to a low-frequency medium-voltage carrier signal generating device for line-variant relation identification, which comprises: the device comprises a power supply module, a remote communication module, a 485 communication module, a control module, a driving module, a low-frequency carrier signal generation module and a zero-crossing detection module.
The low-frequency medium-voltage carrier signal generating device is powered by the power supply module, receives a control command through the remote communication module or the 485 communication module, and outputs a control signal to the driving module by combining a zero-crossing signal of the zero-crossing detection module after the control module receives the command, and the low-frequency medium-voltage carrier signal generating module generates a low-frequency medium-voltage carrier signal. The signal frequency range is 20Hz-2KHz, the frequency is determined by the frequency of the control signal output by the control unit, and the signal intensity is determined by the duty ratio of the control signal.
The power module of the low-frequency medium-voltage carrier signal generating device adopts an isolated switch power supply, has wide input voltage range, supports the input range of 176VAC-456VAC, and can output isolated 12V, 7.2V, 5V, 3.3V, 16V and-8V direct-current voltages for normal work of each submodule of the device.
The remote communication module is compatible with 4G and NB-IoT full-network communication, and can remotely receive a control command and a debugging command after logging in a specified server.
The 485 communication module adopts a 485 chip with low power consumption, wide voltage input and high voltage self-stabilization, and the highest communication speed is 115200 bps.
The control module core adopts a high-performance PIC32MX series 32-bit microcontroller, and can output PWM control signals with different frequencies and different duty ratios according to a control command and a zero-crossing signal. The frequency range is 20H-2kHz, and the duty cycle range is 1/8-7/8.
The core of the driving module adopts a multifunctional integrated driving optocoupler ACPL-332J, has 2.5A output current driving capability, outputs-8V, +16VPWM driving signals with the same frequency and the same duty ratio as the control unit, and has a fault detection self-locking function.
The zero-crossing detection module is compatible with phase voltage zero-crossing signal detection and line voltage zero-crossing signal detection.
The low-frequency carrier signal generation module consists of a high-performance rectifier bridge, a safety capacitor, a resistor, a TVS (transient voltage suppressor) and an IGBT (insulated gate bipolar transistor), and outputs characteristic low-frequency carrier signals according to driving signals with different frequencies and different duty ratios.
The low-frequency medium-voltage carrier signal generating device for line-to-line relation identification works as follows:
selecting two 10kV lines 1 and 10kV lines 2 under 1 transformer substation and a transformer 1 under the 10kV line 1, wherein the distance between the transformer 1 and the transformer substation line is about 5 km;
installing specific signal receiving equipment on the secondary side of the CT of the 10kV line 1 and the 10kV line 2 of the transformer substation;
a low-frequency medium-voltage carrier signal generating device is arranged below the transformer 1;
controlling a low-frequency medium-voltage carrier signal generating device to send a characteristic low-frequency carrier signal under the transformer 1, and recording the sending time T1；
Observing whether characteristic low-frequency carrier signals are received or not under specific receiving equipment of the transformer substation, and recording receiving time T2；
The results show that a particular signal receiving device in 10kV line 1 receives a distinct characteristic low frequency carrier signal, transformer 1 belongs to 10kV line 1, according to the transmission time (T)2-T1) And calculating the length of the line to be about 5.3 km.
In the embodiment, the low-frequency medium-voltage carrier signal generation device is tested and verified by using field actual operation. The low-frequency medium-voltage carrier signal generating device can be used for clearing line variable relations and simply measuring distance under the condition that a 10kV 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. A low-frequency medium-voltage carrier signal generating device for line-variable relation recognition comprises a power module, a remote communication module, a 485 communication module, a control module, a driving module, a zero-crossing detection module and a low-frequency carrier signal generating module, and is characterized in that the low-frequency medium-voltage carrier signal generating device is powered by the power module, receives a control command through the remote communication module or the 485 communication module, outputs a control signal to the driving module by combining a zero-crossing signal of the zero-crossing detection module after receiving the command, and generates a low-frequency medium-voltage carrier signal through the low-frequency medium-voltage carrier signal generating module; the signal frequency range is 20Hz-2KHz, the signal can directly penetrate through the power frequency transformer to be transmitted on a 10kV power line, the frequency is determined by the frequency of the control signal output by the control unit, and the signal intensity is determined by the duty ratio of the control signal.
2. The low-frequency medium-voltage carrier signal generation device for line-to-line relation identification as claimed in claim 1, wherein the power module adopts an isolated switching power supply, has a wide input voltage range, supports an input range of 176VAC-456VAC, and can output isolated 12V, 7.2V, 5V, 3.3V, 16V, -8V dc voltages for normal operation of each submodule of the device.
3. The device as claimed in claim 1, wherein the remote communication module is compatible with 4G and NB-IoT internet wide communication, and is capable of remotely receiving the control command and the debug command after logging in a designated server.
4. The low-frequency medium-voltage carrier signal generation device for line-to-line relation identification as claimed in claim 1, wherein the 485 communication module adopts a low-power consumption, wide-voltage input, high-voltage self-voltage-stabilization 485 chip, and has a highest communication rate of 115200 bps.
5. The low-frequency medium-voltage carrier signal generation device for line-variation relationship identification as claimed in claim 1, wherein the control module core adopts a high-performance PIC32MX series 32-bit microcontroller, and can output PWM control signals with different frequencies and different duty ratios according to the control command and the zero-crossing signal, wherein the frequency range is 20H-2kHz and the duty ratio range is 1/8-7/8.
6. The low-frequency medium-voltage carrier signal generation device for line-to-line relation recognition according to claim 1, wherein the driving module core adopts a multifunctional integrated driving optocoupler ACPL-332J, has 2.5A output current driving capability, outputs-8V, +16VPWM driving signals with the same frequency and the same duty ratio as the control unit, and has a fault detection self-locking function.
7. The low-frequency medium-voltage carrier signal generation device for line-to-line relationship identification as claimed in claim 1, wherein the zero-crossing detection module is compatible with phase voltage zero-crossing signal detection and line voltage zero-crossing signal detection.
8. The low-frequency medium-voltage carrier signal generation device for line-to-line relation identification according to claim 1, wherein the low-frequency carrier signal generation module comprises a high-performance rectifier bridge, a safety capacitor, a resistor, a TVS (transient voltage suppressor) and an IGBT (insulated gate bipolar translator), and outputs characteristic low-frequency carrier signals according to driving signals with different frequencies and different duty ratios.
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| CN2020104448582 | 2020-05-23 | ||
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Cited By (2)
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| CN112994750A (en) * | 2021-02-03 | 2021-06-18 | 青岛鼎信通讯股份有限公司 | Medium-voltage carrier signal generating device |
| CN114006636A (en) * | 2021-01-26 | 2022-02-01 | 青岛鼎信通讯股份有限公司 | Medium-voltage carrier signal self-adaptive coupling device |
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| CN110632453A (en) * | 2019-09-04 | 2019-12-31 | 国网辽宁省电力有限公司电力科学研究院 | Test transformer, combined electrical apparatus and cable combined type connecting equipment and test method thereof |
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| CN104113501A (en) * | 2014-06-19 | 2014-10-22 | 北京科技大学 | Modulator, demodulator, modulation method and demodulation method for low-frequency magnetic induction communication |
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Application publication date: 20201113 |