CN108493915B - Intelligent direct-current residual voltage discharging device of contact net - Google Patents
Intelligent direct-current residual voltage discharging device of contact net Download PDFInfo
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- CN108493915B CN108493915B CN201810191112.8A CN201810191112A CN108493915B CN 108493915 B CN108493915 B CN 108493915B CN 201810191112 A CN201810191112 A CN 201810191112A CN 108493915 B CN108493915 B CN 108493915B
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Classifications
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- 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
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
- H02H9/047—Free-wheeling circuits
Abstract
The application discloses an intelligent discharging device for direct-current residual voltage of a contact net, which is characterized in that a voltage sensor circuit TA is used for measuring the voltage of a traction net in real time; the intelligent controller AIG circuit is used for judging the voltage measured by the voltage sensor circuit TA, recording the discharge current state, sending a discharge instruction, judging the discharge effect, judging the exit condition of the electric push-pull rod circuit TLG and sending an exit instruction; the current sensor circuit TC is used for detecting the residual voltage discharge current of the overhead line system in a closed loop manner; the electric push-pull rod circuit TLG is used for pushing or withdrawing the contact to be contacted with or disconnected from the contact net; the circuit CAD for image acquisition and judgment is used for acquiring the motion state of the TLG and transmitting the acquired state to the intelligent controller to identify the advancing or retreating state of the contact; the primary discharge circuit and the secondary discharge circuit are used for discharging; the device reduces the labor intensity of operators and the quality requirement of high-pressure operation skills, shortens the maintenance time, and improves the safety application coefficient, thereby reducing the maintenance cost.
Description
Technical Field
The application relates to the field of rail transit traction power supply, in particular to an intelligent direct-current residual voltage discharging device of a contact net.
Background
The track traffic traction power supply system generally adopts a direct current 1500V and 750V power supply system, and has a common problem in operation: after the contact net is isolated and disconnected, the contact net voltage value which is displayed by the electroscope and is caused by leakage or stray current of the adjacent power supply section exists, namely, the direct current residual voltage of the contact net.
The residual voltage of the contact net directly threatens personal safety, and influences maintenance construction and power transmission protection locking of the contact net. Different coping modes are adopted at present to reduce the influence caused by the residual pressure of the contact net: the measures adopted by the adult subways are that the residual voltage detection fixed value of the direct current switch cabinet is temporarily adjusted so as to avoid that the contact net cannot transmit power; the Tianjin light rail adopts the measures that the residual voltage value of the contact net is detected on site to distinguish the residual voltage from the normal voltage, and if the residual voltage is determined, the electric discharge and the grounding wire are hung so as to reduce the influence of the residual voltage of the contact net on maintenance. But no targeted measures can be taken at all, so that the problem of residual voltage of the contact net is fundamentally solved, which is a common problem faced by urban rail transit power supply industry in China.
The disadvantages of the prior art are:
1. the maintenance personnel need to have relevant qualification, high quality requirement and large preparation quantity;
2. maintenance personnel need to strictly follow related regulations, but the reality is that the personnel are free to protrude and the regulations are violated to cause harm, such as discharge of the ground wire without electricity test hanging;
3. the problem of burning out the contact by striking fire in the discharging process
4. When the switch cabinet is affected, parameters of the switch cabinet need to be adjusted temporarily, requirements on personnel are high, and safety application coefficients are reduced.
Disclosure of Invention
The application provides an intelligent leakage device for direct current residual voltage of a contact net, which solves the problem that an original visual grounding device burns out a contact of a grounding switch, solves the problem that a disconnecting switch cannot be closed due to direct current residual voltage, improves the time application efficiency of a skylight, solves the problems that maintenance personnel need to have relevant qualification, has high quality requirements and is provided with a large quantity, and realizes the transition from the original personnel management maintenance to the intelligent maintenance of equipment.
The application aims to provide a completely intelligent electricity testing, discharging and electric control grounding execution equipment terminal, which replaces manual operation with electric operation under the condition of not changing the original operation rules, and replaces manual operation with equipment operation, thereby reducing the labor intensity of operators and the quality requirement of high-voltage operation skills, reducing the maintenance time, improving the safety application coefficient and further reducing the maintenance cost.
In order to achieve the aim of the application, the application provides an intelligent discharging device for direct-current residual voltage of a contact net, which comprises:
the intelligent control device comprises a voltage sensor circuit TA, a current sensor circuit TC, an electric push-pull rod circuit TLG, an image acquisition and judgment circuit CAD, an intelligent controller AIG circuit, a primary discharge circuit and a secondary discharge circuit;
the voltage sensor circuit TA is connected with the contact net and is used for measuring the voltage of the traction net in real time; the intelligent controller AIG circuit is used for judging that the voltage measured by the voltage sensor circuit TA is normal voltage or residual voltage, and recording the discharge current state; a discharge instruction is sent, the discharge effect is judged, the exit condition of the electric push-pull rod circuit TLG is judged, and an exit instruction is sent; the current sensor circuit TC is connected with the primary discharge circuit GID and the secondary discharge circuit and is used for detecting residual voltage discharge current of the overhead contact system in a closed loop manner; the electric push-pull rod circuit TLG is used for pushing or withdrawing the contact to be contacted with or disconnected from the contact net based on the instruction of the intelligent controller AIG circuit; the circuit CAD for image acquisition and judgment is used for acquiring the motion state of the TLG and transmitting the acquired state to the intelligent controller to identify the advancing or retreating state of the contact; the first-stage discharging circuit and the second-stage discharging circuit are both connected with the electric push-pull rod circuit TLG, and after the contact contacts with the contact net, the intelligent controller selects the first-stage discharging circuit or the second-stage discharging circuit to discharge the residual voltage of the traction net based on the residual voltage.
The application creatively invents a device terminal product for intelligently identifying direct current residual voltage and intelligently controlling discharge by comprehensively applying an electromechanical integrated technology, a sensor measurement technology, a computer fuzzy identification technology, a power electronic technology and a lightning protection discharge technology, designing an application circuit and an electric mechanism and designing a scientific algorithm.
Preferably, switching between the primary discharging circuit and the secondary discharging circuit is performed according to preset settings of the intelligent controller AIG, and the primary discharging circuit is controlled by adopting a time delay control electronic switch method to finish release of residual voltage greater than 400V; the secondary discharge circuit completes the residual voltage release of less than 400V and more than 75V.
Preferably, the current sensor circuit TC completes the collection of the measured current in the discharging process, and the intelligent controller judges the starting time and the ending time of the discharging and the magnitude of the discharging current according to the measured current flow, records and reports the starting time and the ending time and the magnitude of the discharging current to a preset terminal.
Preferably, the primary discharge circuit comprises two GDT and VDR circuits connected in parallel, both of which are connected between TLG and TC.
Preferably, the secondary discharge circuit includes: SCR, RL, control relay circuit KA, SCR and RL are connected, and SCR and RL are connected between TLG and TC, and SCR and RL are all connected with KA.
Preferably, the electric push-pull rod circuit TLG comprises: the electric telescopic rod is in threaded connection with the contact, the electric telescopic rod stretches or shortens based on instructions of the intelligent controller, openings or grooves used for embedding the traction net contacts are formed in the front face and the side face of the contact, and a plurality of contacts are arranged in the openings or grooves. The contact adopts a leather bronze material, has a structure, is rich in elasticity, is connected forcefully, is silver-plated, and has a contact resistance of less than 10 mu omega.
Preferably, when the intelligent controller judges that the residual voltage is the residual voltage, the electric push-pull rod circuit TLG is automatically put into the electric push-pull rod circuit for discharging after receiving the electricity checking instruction, the discharging circuit is automatically withdrawn after the tested residual voltage reaches a preset value, and the electric push-pull rod circuit is refused to put into the discharging circuit when the intelligent controller judges that the residual voltage is not the residual voltage.
Preferably, when the TC test is not zero, the electric push-pull rod circuit TLG is put into, whether the discharge circuit is put into is identified according to the collected image information of CAD, the primary circuit is used for discharging, whether the discharge is completed is judged according to the situation of the measurement circuit TC, the secondary discharge circuit is put into after timing for 1 second, whether the discharge is completed is judged according to the situation of the measurement circuit TC, and the discharge current is recorded; after the discharge is finished, reporting that the electricity test is successful, and after the time is 2 seconds, sending out an instruction to enable the TLG to move out of the discharge circuit; and confirming TLG action to exit the discharge according to the acquired image information of the CAD, and reporting the discharge success after confirming the exit.
The one or more technical schemes provided by the application have at least the following technical effects or advantages:
the problem that the grounding switch contacts are burnt by the original visual grounding device is solved, the problem that the isolating switch cannot be switched on due to direct-current residual voltage is solved, the skylight time application efficiency is improved, the problem that maintenance personnel need to have relevant qualification, the quality requirement is high, and meanwhile, the equipment quantity is large is solved, and the original conversion from personnel management maintenance to intelligent equipment maintenance is realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application;
FIG. 1 is a schematic diagram of the circuit components of the intelligent dc residual voltage discharging device of the catenary of the present application;
FIG. 2 is a schematic diagram of the present application showing the power push-pull rod circuit TLG being put into the traction network;
FIG. 3 is a schematic diagram showing the push-out of the traction network by the electric push-pull rod circuit TLG according to the present application;
fig. 4 is a schematic diagram of the structure of the contacts of the electric push-pull rod circuit TLG according to the application.
Detailed Description
The application aims to provide a completely intelligent electricity testing, discharging and electric control grounding execution equipment terminal, which replaces manual operation with electric operation under the condition of not changing the original operation rules, and replaces manual operation with equipment operation, thereby reducing the labor intensity of operators and the quality requirement of high-voltage operation skills, reducing the maintenance time, improving the safety application coefficient and further reducing the maintenance cost.
In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. In addition, the embodiments of the present application and the features in the embodiments may be combined with each other without collision.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than within the scope of the description, and the scope of the application is therefore not limited to the specific embodiments disclosed below.
Referring to fig. 1, the application provides a safe, reliable and intelligent operation, and a device terminal product capable of timely and rapidly testing electricity, discharging and grounding.
The product of the application comprises an electric push-pull rod circuit TLG which is electrically controlled and connected; a voltage sensor circuit TA for residual voltage measurement; a discharge tube GDT and a piezoresistor VDR circuit for primary discharge (more than 400V); a secondary discharge (more than 75V) silicon controlled rectifier SCR and a current limiting damper circuit RL and a control relay circuit KA; the system comprises an image acquisition judging circuit CAD, an intelligent controller AIG circuit for intelligent control, a current sensor circuit TC for closed-loop detection of discharge current and the like.
The end product of the application is mainly composed of two parts:the TLG forms a quick input and exits the circuit; />A residual voltage measurement circuit TA; a first stage discharge GDT and VDR circuit; a secondary discharge SCR and RL and KA circuit; an image acquisition circuit CAD; the intelligent controller AIG circuit and the residual voltage identification discharge circuit composed of discharge current measurement TC.
The application creatively adopts an electric push-pull rod mode to carry out the input and the withdrawal of the terminal, solves the problem of electrical interval in a high-voltage state, and solves the problems of burning out the contact by striking fire and quick replacement after burning out by a special contact structure. The detailed structure is shown in fig. 2-4.
The duckbill contact multi-contact effectively solves the problem of contact connection between the contact and the switch contact, reduces the contact resistance to below 10 mu ohms, has small resistance, generates little heat after the electronic switch is switched on, and does not strike fire. The duckbill contact and the push-pull rod are connected and fixed by bolts, so that the replacement is easy.
According to the application, the residual voltage measuring voltage sensor circuit TA measures the voltage of the traction network in real time, the intelligent controller AIC combines the state of the isolating switch to judge whether the voltage at the moment is the normal voltage on the network or the residual voltage, if the voltage is the residual voltage, the intelligent discharging circuit is automatically put into the intelligent discharging circuit to discharge after receiving an electricity checking instruction, the discharging circuit is automatically withdrawn after the tested residual voltage reaches a preset value, if the residual voltage is not the residual voltage, the intelligent discharging circuit is refused to put into the discharging circuit, and if the residual voltage is lower than the preset value, the intelligent discharging circuit is not put into the discharging circuit.
According to the application, the motion state of the TLG is acquired by adopting CAD, the intelligent controller recognizes the input and the exit of the contact through a fuzzy image recognition technology, and completes intelligent direct current residual voltage recognition by combining other operation instructions and voltage values, whether the residual voltage is the residual voltage or not and other conditions, and discharges, so that the safe operation of a terminal product is ensured without affecting the safety and the reliability of the existing equipment.
The application adopts a two-stage discharge mode to discharge, and successfully solves the problems of ignition and overlong discharge time caused by unbalanced current in the high-voltage discharge and low-voltage discharge processes. The release of residual voltage of more than 400V is completed by GDT and VDR1, the problem of large-current discharge is solved, the rapid release of residual voltage of less than 400V and more than 75V is completed by SCR1, RL and KA, and the voltage after discharge is zero. All residual pressure release control is implemented under the control of the intelligent controller, and the technical scheme is shown in detail.
The discharge current measuring circuit TC completes the collection of the measured current in the discharge process, the intelligent controller intelligently judges the starting time and the ending time of the discharge and the magnitude of the anti-electricity current according to the flow of the measured current, and records and reports the starting time and the ending time of the discharge and the magnitude of the anti-electricity current.
The intelligent controller AIC of the application is a centralized control system of the equipment terminal, which comprises a CPU processor and a software program of independent intellectual property rights (patent application), and completes the input and the exit conditions of the terminal: if the disconnecting switch is closed, the input is refused and the refusal reason is reported, and if the measured voltage is 'o', the input is refused and the electricity verification success is reported. When the TC test is not zero, a discharge circuit is put into operation, whether the discharge circuit is put into operation is authenticated according to the condition of CAD, the primary circuit discharges, whether the discharge is completed is judged according to the condition of the measurement circuit TC, a second stage discharge circuit (completed by KA and SCR) is put into operation after timing for 1 second, whether the discharge is completed is judged according to the condition of the measurement circuit TC (the test value is 0), and the discharge current is recorded. And after the discharge is finished, reporting that the electricity test is successful, and giving out a command to enable the TLG to move out of the discharge circuit after timing for 2 seconds. And confirming TLG action to exit the discharge according to the CAD condition, reporting the successful intelligent discharge of the discharge after the exit, reporting the electricity inspection, the discharge result, the safety guarantee measures and the like.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (9)
1. An intelligent dc residual voltage discharging device for a contact net, comprising:
the intelligent control device comprises a voltage sensor circuit TA, a current sensor circuit TC, an electric push-pull rod circuit TLG, an image acquisition and judgment circuit CAD, an intelligent controller AIG circuit, a primary discharge circuit and a secondary discharge circuit;
the voltage sensor circuit TA is connected with the contact net and is used for measuring the voltage of the traction net in real time; the intelligent controller AIG circuit is used for judging that the voltage measured by the voltage sensor circuit TA is normal voltage or residual voltage, and recording the discharge current state; a discharge instruction is sent, the discharge effect is judged, the exit condition of the electric push-pull rod circuit TLG is judged, and an exit instruction is sent; the current sensor circuit TC is connected with the primary discharge circuit GID and the secondary discharge circuit and is used for detecting residual voltage discharge current of the overhead contact system in a closed loop manner; the electric push-pull rod circuit TLG is used for pushing or withdrawing the contact to be contacted with or disconnected from the contact net based on the instruction of the intelligent controller AIG circuit; the circuit CAD for image acquisition and judgment is used for acquiring the motion state of the TLG and transmitting the acquired state to the intelligent controller to identify the advancing or retreating state of the contact; the first-stage discharging circuit and the second-stage discharging circuit are both connected with the electric push-pull rod circuit TLG, and after the contact contacts with the contact net, the intelligent controller selects the first-stage discharging circuit or the second-stage discharging circuit to discharge the residual voltage of the traction net based on the residual voltage.
2. The intelligent discharging device for the direct current residual voltage of the overhead line system according to claim 1, wherein the primary discharging circuit is used for completing the discharging of the residual voltage of more than 400V; the secondary discharge circuit completes the residual voltage release of less than 400V and more than 75V.
3. The intelligent discharging device for the direct current residual voltage of the overhead line system according to claim 1, wherein the current sensor circuit TC is used for completing collection of measuring current in the discharging process, and the intelligent controller is used for judging the starting time and the ending time of the discharging and the magnitude of the discharging current according to the measuring current flow and recording and reporting the starting time and the ending time and the magnitude of the discharging current to a preset terminal.
4. The overhead line direct current residual voltage intelligent discharging device according to claim 1, wherein the primary discharging circuit comprises two discharging tube GDT circuits and a piezoresistor VDR circuit connected in parallel, and the discharging tube GDT circuits and the piezoresistor VDR circuits are connected between TLG and TC.
5. The overhead contact system dc residual voltage intelligent relief device according to claim 1 wherein the secondary discharge circuit comprises: the device comprises a silicon controlled rectifier SCR, a current limiting damper circuit RL and a control relay circuit KA, wherein the silicon controlled rectifier SCR is connected with the current limiting damper circuit RL, the silicon controlled rectifier SCR is connected between a TLG and a TC with the current limiting damper circuit RL, the SCR is connected with the KA, and the SCR is connected with the RL and the KA to realize the function of an electronic switch, so that the spark-free discharge and isolation control functions are completed.
6. The overhead contact system dc residual voltage intelligent relief device according to claim 1, wherein the electric push-pull rod circuit TLG comprises: the electric telescopic rod is in threaded connection with the contact, the electric telescopic rod stretches or shortens based on instructions of the intelligent controller, openings or grooves used for embedding the traction net contact are formed in the front face and the side face of the contact, a plurality of contacts are arranged in the openings or grooves, the contact is made of leather bronze, and silver plating is conducted on the contacts.
7. The overhead contact system dc residual voltage intelligent relief device according to claim 6 wherein the contact resistance of the contact is less than 10 μΩ.
8. The intelligent discharging device for the direct-current residual voltage of the overhead line system according to claim 1, wherein when the intelligent controller judges that the residual voltage is the residual voltage, the intelligent controller automatically inputs the electric push-pull rod circuit TLG to discharge after receiving an electricity inspection instruction, automatically exits the discharging circuit after the tested residual voltage reaches a preset value, and when the intelligent controller judges that the residual voltage is not the residual voltage, the intelligent controller refuses to input the discharging circuit.
9. The intelligent discharging device for the direct current residual voltage of the overhead line system according to claim 1, wherein when the TC test is not zero, an electric push-pull rod circuit TLG is put in, whether a discharging circuit is put in or not is recognized according to the collected image information of CAD, the first-stage circuit is used for discharging, whether the discharging is completed is judged according to the TC condition of the measuring circuit, a second-stage discharging circuit is put in after timing for 1 second, whether the discharging is completed is judged according to the TC condition of the measuring circuit, and the discharging current is recorded; after the discharge is finished, reporting that the electricity test is successful, and after the time is 2 seconds, sending out an instruction to enable the TLG to move out of the discharge circuit; and confirming TLG action to exit the discharge according to the acquired image information of the CAD, and reporting the discharge success after confirming the exit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810191112.8A CN108493915B (en) | 2018-03-08 | 2018-03-08 | Intelligent direct-current residual voltage discharging device of contact net |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810191112.8A CN108493915B (en) | 2018-03-08 | 2018-03-08 | Intelligent direct-current residual voltage discharging device of contact net |
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| CN108493915A CN108493915A (en) | 2018-09-04 |
| CN108493915B true CN108493915B (en) | 2023-11-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112590624B (en) * | 2020-12-24 | 2022-12-20 | 四川汇友电气有限公司 | Automatic grounding device for 27.5kV contact network of electrified railway and control method thereof |
| CN113085667A (en) * | 2021-04-08 | 2021-07-09 | 成都汇控科技有限公司 | Automatic grounding device for urban rail transit traction network and control method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545193A (en) * | 2011-12-29 | 2012-07-04 | 深圳市合信自动化技术有限公司 | Method and device for discharging residual voltage of bus of servo controller |
| DE102012210008A1 (en) * | 2012-06-14 | 2013-12-19 | Robert Bosch Gmbh | Method and device for discharging an electrical network |
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2018
- 2018-03-08 CN CN201810191112.8A patent/CN108493915B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545193A (en) * | 2011-12-29 | 2012-07-04 | 深圳市合信自动化技术有限公司 | Method and device for discharging residual voltage of bus of servo controller |
| DE102012210008A1 (en) * | 2012-06-14 | 2013-12-19 | Robert Bosch Gmbh | Method and device for discharging an electrical network |
Non-Patent Citations (1)
| Title |
|---|
| 基于暂态残压计算的接触网故障性质智能辨识;刘铁;杨维;赵浩江;;中国铁道科学(04);全文 * |
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