CN110535114B - RS-485 line surge protector for low-voltage collector communication and use method thereof - Google Patents
RS-485 line surge protector for low-voltage collector communication and use method thereof Download PDFInfo
- Publication number
- CN110535114B CN110535114B CN201910896064.7A CN201910896064A CN110535114B CN 110535114 B CN110535114 B CN 110535114B CN 201910896064 A CN201910896064 A CN 201910896064A CN 110535114 B CN110535114 B CN 110535114B
- Authority
- CN
- China
- Prior art keywords
- igbt module
- surge protector
- line
- pin
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000001012 protector Effects 0.000 title claims abstract description 60
- 238000004891 communication Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000004020 conductor Substances 0.000 claims description 6
- 230000035945 sensitivity Effects 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention provides an RS-485 line surge protector for low-voltage collector communication and a use method thereof, wherein the RS-485 line surge protector comprises the following steps: the device comprises a collector, a first surge protector, a second surge protector, a first IGBT module and a second IGBT module; the voltage larger than 6.5V is prevented from reaching the condition that the collector damages the SIM card, and the normal communication of the collector is ensured; the mode of voltage high-low matching and waveform time length matching is adopted, the condition that a large amount of capital is invested to improve the sensitivity of the surge protection module at the microsecond level, namely the sensitivity can be used at the nanosecond level, and the pressure resistance of the surge protection module at the nanosecond level high voltage is improved is avoided. But can also be used in tens of thousands to millions of volts.
Description
Technical Field
The invention relates to the technical field of surge protectors, in particular to an RS-485 line surge protector for low-voltage collector communication and a using method thereof
Background
The centralized meter reading system mainly comprises 2 parts. One is the master station system part (e.g., concentrator) and the other is the collector. The collector is used for intensively reading the electric energy information of the electric energy meters through the RS-485 line, then the electric energy information is remotely transmitted to the main station through a transmission medium (GPRS, optical fiber and other channels), the main station inputs the intensively read data into the main station database, and then the main station is connected with the computer, so that the computer can conveniently read the data from the main station at any time. The main station system part completes the functions of statistics of electric energy data of each station area, assessment of electricity utilization conditions, analysis of line loss, prepayment management and the like according to the copied data, so that the collector is required to work normally.
The RS-485 data signal is transmitted differentially, also known as balanced transmission, using a pair of twisted pair wires, one of which is defined as a and the other as B. Normally, the positive level between transmit drivers A, B is between +2 and +6V, one logic state, and the negative level is between-2V and 6V, the other logic state.
In practical application, the situation that the collector cannot normally send data is often caused, the situation that the SIM card used for sending the electric quantity data to the centralized receiver in the collector is damaged is often checked and found on site, the professional identification conclusion of the Unicom company is that the SIM card is damaged due to overvoltage conducted through RS-485, the normal working voltage of the SIM card is 4-6 (V), and the SIM card can be damaged when the voltage exceeds 7V.
By monitoring the cells which often cause damage to the SIM card, it was found that 37.6% of the SIM card damage was caused by the lightning waveform with a voltage greater than 1000V at the delicate level, and 72.4% of the SIM card damage was caused by the electrical noise at the nanosecond level, i.e., the transient overvoltage with a voltage lower than 1000V, existing in the RS-485 communication line.
The sensitivity of the existing signal line SPD is not enough, and the existing signal line SPD cannot react to nanosecond-level electric noise, so that the SIM card (with the highest tolerance of 7V) is damaged by the voltage below 1000V carried by the electric noise.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an RS-485 line surge protector for low-voltage collector communication, which comprises: the device comprises a collector, a first surge protector, a second surge protector, a first IGBT module and a second IGBT module;
the collector is connected with a communication cable and an RS-485 line;
the first surge protector is connected with the RS-485 line through a lead;
the second surge protector is connected with the communication cable through a lead;
the G pin of the first IGBT module is connected with a communication cable;
the pin E of the first IGBT module is connected with an RS-485 line;
the C pin of the first IGBT module is grounded;
the G pin of the second IGBT module is connected with an RS-485 line;
the E pin of the second IGBT module is connected with a communication cable;
and the pin C of the second IGBT module is grounded.
Further, it should be noted that the method further includes: a first fuse and a second fuse;
the first surge protector is connected with the RS-485 line through a lead and a first fuse;
the second surge protector is connected with the communication cable through a wire and a second fuse.
Further, it should be noted that the method further includes: a housing;
the first surge protector, the second surge protector, the first IGBT module and the second IGBT module are respectively arranged in the shell;
two opposite side plates of the shell are respectively provided with a through hole;
the communication cable and the RS-485 line penetrate through the shell through the through holes and are correspondingly connected with the first surge protector, the second surge protector, the first IGBT module and the second IGBT module in the shell.
It should be further noted that a bolt is connected to a side plate of the housing, and a cable connector is sleeved on the bolt;
the cable joint is connected with a straight conductor, and the end part of the straight conductor is connected with a grounding plate.
The shell is provided with a door body.
It is further noted that the model numbers of the first IGBT module and the second IGBT module are FF300R1700KE 3.
The invention also provides a use method of the RS-485 line surge protector for the low-voltage collector communication, which comprises the following steps:
surge and instantaneous overvoltage on the RS-485 line and the communication cable are inhibited through the first surge protector and the second surge protector, and overcurrent on the RS-485 line and the communication cable is discharged;
when the voltage of the G pin of the first IGBT module is larger than or equal to 6.5V, the E pin and the C pin are conducted;
the RS-485 line is grounded through the first IGBT module so that a voltage greater than 6.5V is conducted to ground.
When the voltage of the G pin of the second IGBT module is larger than or equal to 6.5V, the E pin and the C pin are conducted;
the communication cable is grounded through the second IGBT module, so that the voltage larger than 6.5V is conducted to the ground.
According to the technical scheme, the invention has the following advantages:
the RS-485 line surge protector for the low-voltage collector communication prevents the voltage larger than 6.5V from reaching the collector and damaging the SIM card, and ensures the normal communication of the collector; the mode of voltage high-low matching and waveform time length matching is adopted, the condition that a large amount of capital is invested to improve the sensitivity of the surge protection module at the microsecond level, namely the sensitivity can be used at the nanosecond level, and the pressure resistance of the surge protection module at the nanosecond level high voltage is improved is avoided. But can also be used in tens of thousands to millions of volts.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of an RS-485 line surge protector for low-voltage collector communication;
fig. 2 is a schematic diagram of an embodiment of an RS-485 line surge protector for low-voltage collector communication.
Detailed Description
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The invention provides an RS-485 line surge protector for low-voltage collector communication, as shown in figures 1 and 2, comprising: the device comprises a collector 1, a first surge protector 4, a second surge protector 5, a first IGBT module 6 and a second IGBT module 7; the collector 1 is connected with a communication cable 2 and an RS-485 line 3; the first surge protector 4 is connected with the RS-485 line 3 through a lead; the second surge protector 5 is connected with the communication cable 2 through a lead; the G pin of the first IGBT module 6 is connected with the communication cable 2; the pin E of the first IGBT module 6 is connected with the RS-485 line 3; the pin C of the first IGBT module 6 is grounded; a G pin of the second IGBT module 7 is connected with the RS-485 line 3; the pin E of the second IGBT module 7 is connected with the communication cable 2; the C-leg of the second IGBT module 7 is grounded. The model numbers of the first IGBT module 6 and the second IGBT module 7 are FF300R1700KE 3.
Wherein, the RS-485 line surge protector for low voltage collector communication still includes: a first fuse 8 and a second fuse 9; the first surge protector 4 is connected with the RS-485 line 3 through a lead and a first fuse 8; the second surge protector 5 is connected with the communication cable 2 through a wire and a second fuse 9.
For the convenience of installation and use, the device also comprises: a housing 11; the first surge protector 4, the second surge protector 5, the first IGBT module 6 and the second IGBT module 7 are respectively arranged in the shell 11; two opposite side plates of the shell 11 are respectively provided with a through hole; the communication cable 2 and the RS-485 line 3 penetrate through the shell 11 through holes and are correspondingly connected with the first surge protector 4, the second surge protector 5, the first IGBT module 6 and the second IGBT module 7 in the shell 11. A bolt 12 is connected to a side plate of the shell 11, and a cable joint is sleeved on the bolt 12; the cable connector is connected with a straight conductor 13, and the end of the straight conductor 13 is connected with a grounding plate 14. The casing 11 is provided with a door body.
Aiming at the lightning waveform of a delicate level, the invention can be provided with a Surge Protector (SPD) to inhibit the Surge and the instantaneous overvoltage on the line and the over-current on the discharge line. The lightning is characterized in that the voltage rises within 10 mu s very fast, the peak voltage is tens of thousands to millions of volts, the current is dozens to hundreds of kiloamperes, the holding time is dozens to hundreds of microseconds shorter, the transmission speed is fast and is transmitted at the speed of light, the energy is very huge, and the lightning is one of the most destructive power in surge voltage. SPD is an indispensable device in electronic equipment lightning protection, and its function is to limit the transient overvoltage entering the power line and signal transmission line within the voltage range that the equipment or system can bear, or to bleed strong lightning current into the ground, and protect the protected equipment or system from impact. The signal line SPD is actually a signal arrester, is arranged in a signal transmission line, is generally arranged at the front end of equipment and is used for protecting subsequent equipment and preventing lightning waves from rushing into the collector from the signal line to damage the collector.
The RS-485 line surge protector for the low-voltage collector communication uses a surge protection module based on the IGBT, and can discharge the wave head of electric noise and lightning current of 1200V or below at most; at microsecond level, if lightning current flees into an RS-485 line, when the voltage exceeds 1000V, a traditional signal line SPD starts, the peak voltage is tens of thousands to millions of volts, the current is tens of thousands to hundreds of kiloamperes, the holding time is short, tens of microseconds to hundreds of microseconds, the transmission speed is high, the lightning is spread at the speed of light, and the energy is very huge. The two are matched in length and height in time and voltage grade, and the voltage on the RS-485 line is ensured to be lower than 6.5V.
The invention also provides a use method of the RS-485 line surge protector for the low-voltage collector communication based on the RS-485 line surge protector for the low-voltage collector communication, which comprises the following steps:
surge and instantaneous overvoltage on the RS-485 line and the communication cable are inhibited through the first surge protector and the second surge protector, and overcurrent on the RS-485 line and the communication cable is discharged;
when the voltage of the G pin of the first IGBT module is larger than or equal to 6.5V, the E pin and the C pin are conducted;
the RS-485 line is grounded through the first IGBT module so that a voltage greater than 6.5V is conducted to ground.
When the voltage of the G pin of the second IGBT module is larger than or equal to 6.5V, the E pin and the C pin are conducted;
the communication cable is grounded through the second IGBT module, so that the voltage larger than 6.5V is conducted to the ground.
In the use method of the RS-485 line surge protector for the low-voltage collector communication, 2 lines are connected in parallel on the RS-485 line and are connected with the developed combined surge protector, microsecond-level surge protection modules and nanosecond-level high-voltage surge protection modules are in parallel connection, meanwhile, C pins of two IGBTs need to be connected in parallel and grounded, the installation is very convenient, and actually only 3 terminals are arranged outside the combined surge protector and are respectively connected with the RS-485 blue line, the RS-485 black line and the RS-485 ground from left to right.
The voltage larger than 6.5V is prevented from reaching the condition that the collector damages the SIM card, and the normal communication of the collector is ensured;
the mode of voltage high-low matching and waveform time length matching is adopted, the condition that a large amount of capital is invested to improve the sensitivity of the surge protection module at the microsecond level, namely the sensitivity can be used at the nanosecond level, and the pressure resistance of the surge protection module at the nanosecond level high voltage is improved is avoided. But can also be used in tens of thousands to millions of volts.
The program code contained on the RS-485 line surge protector for low voltage harvester communication can be transmitted using any suitable medium, including but not limited to wireless, wireline, optical cable, RF, etc., or any suitable combination of the foregoing.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (3)
1. The utility model provides a low pressure collector RS-485 line surge protector for communication which characterized in that includes: the device comprises a collector (1), a first surge protector (4), a second surge protector (5), a first IGBT module (6), a first fuse (8), a second fuse (9), a shell (11) and a second IGBT module (7);
the collector (1) is connected with a communication cable (2) and an RS-485 line (3);
the G pin of the first IGBT module (6) is connected with the communication cable (2);
the pin E of the first IGBT module (6) is connected with the RS-485 line (3);
the pin C of the first IGBT module (6) is grounded;
a G pin of the second IGBT module (7) is connected with an RS-485 line (3);
the pin E of the second IGBT module (7) is connected with the communication cable (2);
the pin C of the second IGBT module (7) is grounded;
the first surge protector (4) is connected with the RS-485 line (3) through a lead and a first fuse (8);
the second surge protector (5) is connected with the communication cable (2) through a wire and a second fuse (9);
the first surge protector (4), the second surge protector (5), the first IGBT module (6) and the second IGBT module (7) are respectively arranged in the shell (11);
two opposite side plates of the shell (11) are respectively provided with a through hole;
the communication cable (2) and the RS-485 line (3) penetrate through the shell (11) through the through holes and are correspondingly connected with the first surge protector (4), the second surge protector (5), the first IGBT module (6) and the second IGBT module (7) in the shell (11);
a bolt (12) is connected to a side plate of the shell (11), and a cable joint is sleeved on the bolt (12);
the cable joint is connected with a straight conductor (13), and the end part of the straight conductor (13) is connected with a grounding plate (14);
a door body is arranged on the shell (11);
the model number of the first IGBT module (6) and the second IGBT module (7) is FF300R1700KE 3.
2. An application method of the RS-485 line surge protector for the low-voltage collector communication is characterized in that the RS-485 line surge protector for the low-voltage collector communication according to claim 1 is adopted;
the method comprises the following steps:
surge and instantaneous overvoltage on the RS-485 line and the communication cable are inhibited through the first surge protector and the second surge protector, and overcurrent on the RS-485 line and the communication cable is discharged;
when the voltage of the G pin of the first IGBT module is larger than or equal to 6.5V, the E pin and the C pin are conducted;
the RS-485 line is grounded through the first IGBT module so that a voltage greater than 6.5V is conducted to ground.
3. Use according to claim 2,
when the voltage of the G pin of the second IGBT module is larger than or equal to 6.5V, the E pin and the C pin are conducted;
the communication cable is grounded through the second IGBT module, so that the voltage larger than 6.5V is conducted to the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910896064.7A CN110535114B (en) | 2019-09-22 | 2019-09-22 | RS-485 line surge protector for low-voltage collector communication and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910896064.7A CN110535114B (en) | 2019-09-22 | 2019-09-22 | RS-485 line surge protector for low-voltage collector communication and use method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110535114A CN110535114A (en) | 2019-12-03 |
| CN110535114B true CN110535114B (en) | 2022-04-15 |
Family
ID=68669515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910896064.7A Active CN110535114B (en) | 2019-09-22 | 2019-09-22 | RS-485 line surge protector for low-voltage collector communication and use method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110535114B (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1801567A (en) * | 2005-12-20 | 2006-07-12 | 陈俊峰 | Lightning electric circuit |
| CN206481055U (en) * | 2017-02-28 | 2017-09-08 | 浙江省地震监测预报研究中心 | Lightning protection device |
| CN110112720B (en) * | 2019-05-23 | 2021-10-01 | 上海艾为电子技术股份有限公司 | Surge protection circuit, port chip and surge protection method |
-
2019
- 2019-09-22 CN CN201910896064.7A patent/CN110535114B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110535114A (en) | 2019-12-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106058837B (en) | A kind of leakage conductor leak current detection device of no isolating device | |
| CN204269739U (en) | Based on thunderbolt diagnosis and the real time warning device of leakage conductor | |
| CN104991148A (en) | 10kV power distribution tower grounding impulse response curve testing device | |
| CN110535114B (en) | RS-485 line surge protector for low-voltage collector communication and use method thereof | |
| CN208421149U (en) | A kind of power frequency continued flow experimental rig | |
| CN200950538Y (en) | RS-485 Communication interface protective circuit | |
| CN204575773U (en) | The impedance of grounding net of transformer substation frequency sweep and the automatic test diagnosis equipment of amplitude-frequency response | |
| CN201449437U (en) | Voltage-withstanding tester with high-voltage protective circuit | |
| CN2321155Y (en) | Lightening arrester for electronic equipment | |
| CN204964641U (en) | 10kV distribution tower grounding impulse response curve testing arrangement | |
| CN213124002U (en) | Integrated lightning arrester with lightning stroke recording function | |
| CN210517428U (en) | Distributed system structure inside electric cabinet | |
| CN102931592A (en) | Lightning-protection power distribution cabinet | |
| CN202997329U (en) | Lightning-protection power distribution cabinet | |
| CN114264896B (en) | On-line monitoring device for lightning arrester | |
| CN201048288Y (en) | Simple earthing 220V 2-port 3-module power supply surge protector | |
| CN211955720U (en) | Test circuit for verifying lightning protection capability of signal surge protector | |
| CN2166553Y (en) | Arrester tester | |
| CN206595712U (en) | Surging prevention device for mobile terminal production line | |
| CN215256607U (en) | Wind generating set blade lightning receptor downlead auxiliary measuring device | |
| CN204330922U (en) | Lightning arrester on-line checkingi safety feature | |
| CN104113054A (en) | Combined type anti-thunder equipment capable of preventing concentrated copy electric energy meter from being damaged by thunder and lightning | |
| CN218275375U (en) | Electrostatic protection network port and network communication equipment | |
| CN205176118U (en) | Overvoltage on -line monitoring device | |
| CN207020362U (en) | Intelligent lightning protecting optical cross box |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |