CN115453412B - Urban rail transit traction network maintenance grounding loop broken line monitoring device - Google Patents
Urban rail transit traction network maintenance grounding loop broken line monitoring device Download PDFInfo
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- CN115453412B CN115453412B CN202211408721.7A CN202211408721A CN115453412B CN 115453412 B CN115453412 B CN 115453412B CN 202211408721 A CN202211408721 A CN 202211408721A CN 115453412 B CN115453412 B CN 115453412B
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B3/00—Apparatus specially adapted for the manufacture, assembly, or maintenance of boards or switchgear
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00034—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving an electric power substation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Manufacturing & Machinery (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention provides an urban rail transit traction network maintenance grounding loop broken line monitoring device which comprises a direct current power supply US, a three-position switch S, a discharge loop resistor R5, a voltage transmitter and a controller, wherein one end of the discharge loop resistor R5 is connected with a steel rail, the other end of the discharge loop resistor R5 is connected with the negative electrode of the direct current power supply US and the upper port of a visual grounding switch through the three-position switch S, the positive electrode of the direct current power supply US is connected with a contact network, the input end of the voltage transmitter is connected with the two ends of the discharge loop resistor R5, the output end of the voltage transmitter is connected with the controller, the controller is connected with the three-position switch S, and the controller monitors the three-position switch S. The invention measures the conduction condition of the traction network under the normal operation condition and the grounding circuit after shutdown, has the function of traction power supply circuit discharge, fills the monitoring function of the grounding effect of the visual grounding circuit, and improves the safety of operation and maintenance work.
Description
Technical Field
The invention belongs to the field of urban rail transit, and particularly relates to a device for monitoring broken lines of an overhauling ground circuit of an urban rail transit traction network.
Background
The urban rail transit traction substation supplies power to the contact network through the direct-current switch cabinet, the direct-current cable and the contact network isolating switch, and the power supply voltage is DC1500V. As shown in fig. 1, a main line is adjacent to a traction substation a and a traction substation B, and bilateral power supply is performed on a main line contact network power supply zone M.
And when the system normally operates, a 2131 feeder line of the traction substation A and a 2111 feeder line of the traction substation B are switched on, and bilateral power supply is provided for a contact network of the power supply zone M. At this time, the visual earthing switch 2131E of the traction substation a and the visual earthing switch 2111E of the traction substation B are opened.
When the night contact network of the power supply zone M is stopped and overhauled, a 2131 feeder line and a contact switch 2113 of the traction substation A and a 2111 feeder line and a contact switch 2113 of the traction substation B are switched off. And the visual grounding switch 2131E of the traction substation A and the visual grounding switch 2111E of the traction substation B are switched on. At this moment, the two ends of the contact net of the power supply subarea M are conducted with the steel rail, so that safe grounding is realized. Visual earthing switch 2131E and 2111E need monitor the voltage difference at switch both ends earlier before closing, if the voltage difference is too big, need discharge the return circuit and discharge until the voltage difference reduces to safety range.
If visual earthing switch connects to the anodal cable broken string of contact net, perhaps visual earthing switch connects to the negative cable broken string of rail, the prior art means can't discern to bring the potential safety hazard for the operation maintenance: 1. the contact net is not real outage, but earthing switch closes a floodgate successfully, after the visual earthing switch of video display closes a floodgate, the reliable ground connection of operation and maintenance maintainer acquiescence power supply subregion M's contact net, operation and maintenance maintainer begins to overhaul the operation to power supply subregion M's contact net this moment, break into electrified interval in other words, will take place the electric shock injury, there is potential safety hazard 2, when overhauing the operation, if pull the transformer substation misdelivery of electricity accident, it does not play the guard action to pull the net ground circuit, will take place the electric shock injury, there is the potential safety hazard.
Disclosure of Invention
The invention provides a device for monitoring broken lines of an overhauling ground circuit of an urban rail transit traction network, aiming at the technical problems in the prior art, the device is used for measuring the traction network voltage under the normal operation working condition and the conduction condition of the ground circuit after the operation is stopped, has the function of traction power supply circuit discharging, fills the monitoring function of the visual ground circuit grounding effect, and improves the safety of operation and maintenance work.
The technical scheme adopted by the invention is as follows: the utility model provides an urban rail transit traction network overhauls ground circuit broken string monitoring devices, includes DC power supply US, three position switch S, discharge loop resistance R5, voltage transmitter and controller, one termination rail of discharge loop resistance R5, the other end passes through three position switch S and is connected with DC power supply US negative pole, visual earthing switch last port, DC power supply US ' S positive pole is connected with the contact net, voltage transmitter ' S input with discharge loop resistance R5 ' S both ends are connected, voltage transmitter ' S output is connected with the controller, and voltage transmitter measures discharge loop resistance R5 ' S voltage to give the controller, the controller with three position switch S connects, and three position switch S is monitored to the controller.
Further, the resistance of the discharge loop resistor R5 is 10000 Ω.
Further, the output voltage of the dc power supply US is 36V.
Furthermore, a first free end of the three-position switch S is an isolation position S0 and is suspended in the air; the second free end is a discharge position S1 and is connected with the upper port of the visual grounding switch; and the third free end is a monitoring position S2 and is connected with the negative electrode of the direct current power supply US.
Further, the controller comprises an analog input module, an A/D conversion module, a CPU, a power supply module, a memory, an Ethernet module, a switching value output module and a switching value input module, wherein the analog input module is connected with the A/D conversion module, and the CPU is respectively connected with the A/D conversion module, the power supply module, the memory, the Ethernet module, the switching value output module and the switching value input module.
Further, the operation flow is as follows:
the first step is as follows: the controller controls the three-position switch S to the S1 position, so that the discharge loop resistor R5 is electrically communicated with the upper port of the visual grounding switch, and the voltage U1 on the discharge loop resistor R5 is obtained through measurement; if U1 is larger than or equal to Uset1, judging that the visual grounding loop is intact; if U1 is less than Uset1, preliminarily judging that the voltage of a traction network is abnormal or a grounding loop where a visual grounding switch 2131E of a traction station A is abnormal; and USet1 is a traction network voltage measurement set value.
The second step is that: the traction substation A and the traction substation B cut off the power supply subarea M;
the third step: measuring to obtain a voltage U2 on a discharge loop resistor R5, if U2 is more than or equal to USet2, continuously releasing the induced charge of the traction network by the monitoring device until U2 is less than USet2, and carrying out a fourth step; the USet2 is a set value for discharging the traction network;
the fourth step: the visual grounding switch 2131E is switched on and delays T;
the fifth step: the controller controls the three-position switch S to the S2 position, so that the discharge loop resistor R5 is electrically communicated with the direct current power supply US, and the voltage U3 on the discharge loop resistor R5 is obtained through measurement;
if U3 is greater than or equal to USet3, judging that the grounding loop where the visual grounding switch 2131E of the traction station A is located is well conducted;
if U3 is less than USet3 and U1 is more than or equal to USet1, judging that the monitoring device is abnormal;
if U3 is less than USet3 and U1 is less than USet1, judging that the ground circuit where the visual ground switch 2131E of the traction station A is located is broken; USet3 is the ground loop conduction set point.
Further, the USet1 is 900V, the USet2 is 600V, the USet3 is 10.08V, and the T is 2s.
The working principle is as follows: the direct-current power supply US, the three-position switch S and the discharge loop resistor R5 form a monitoring loop, the traction network voltage under the normal operation working condition and the conduction condition of the grounding loop after shutdown can be monitored, the voltage transmitter measures the voltage of the discharge loop resistor R5 and sends the voltage to the controller, and whether the traction network voltage is normal or not and whether the grounding loop is disconnected or not can be visually judged according to the comparison result of the measured voltage value on the discharge loop resistor R5 and a set value.
Compared with the prior art, the invention has the beneficial effects that:
1. in order to improve the reliability, the original visual grounding equipment is connected with a contact net and 2 positive and negative cables of the steel rail, the structure of the original visual grounding equipment is not changed, in order to ensure the reliability, the invention can change 1 positive and negative cable to a monitoring loop, and the engineering cost is controllable.
2. The invention adopts a mode of twice checking, namely, the traction network voltage under the normal operation condition is measured for the first time, and the grounding loop conduction condition after the operation is stopped is measured for the second time, so that the invention is more reliable and eliminates the worry of an operation maintenance department.
3. The original manual system overhaul grounding process and process control time are about 30 minutes, but by adopting the invention, the whole monitoring process can be remotely controlled and operated remotely, can be controlled by program, and can be completed in 3-5 minutes, thereby greatly saving skylight time and improving overhaul efficiency.
4. The invention fills the monitoring function of the grounding effect of the visual grounding loop and improves the safety of operation and maintenance work.
5. The invention adopts the three-position switch S to realize the switching among three functions of isolation, traction network discharge and grounding loop monitoring, reduce the equipment cost and contribute to realizing the miniaturization and mass production of equipment.
Drawings
FIG. 1 is a schematic diagram of bilateral power supply of urban rail transit in the prior art;
FIG. 2 is a schematic illustration of an installation of an embodiment of the present invention;
FIG. 3 is a block diagram of a controller according to an embodiment of the present invention;
FIG. 4 is an equivalent circuit diagram of the fifth step of the present invention.
In the figure, 1-voltage transmitter, 2-controller, 21-analog input module, 22-A/D conversion module, 23-CPU, 24-power module, 25-memory, 26-Ethernet module, 27-switching value output module, 28-switching value input module and 29-panel indicator light.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The embodiment of the invention provides an urban rail transit traction network overhaul grounding loop disconnection monitoring device, which comprises a direct current power supply US, a three-position switch S, a discharge loop resistor R5, a voltage transmitter 1 and a controller 2, as shown in figure 2. One end of the discharge loop resistor R5 is connected with the steel rail, and the other end of the discharge loop resistor R5 is connected with the negative electrode of the direct current power supply US and the upper port of the visual grounding switch through the three-position switch S. The first free end of the three-position switch S is an isolation position S0 and is suspended in the air; the second free end is a discharge position S1 and is connected with the upper port of the visual grounding switch; and the third free end is a monitoring position S2 and is connected with the negative electrode of the direct current power supply US. And the positive electrode of the direct current power supply US is connected with a contact net. The resistance of the discharge loop resistor R5 is 10000 Ω. The output voltage of the dc power supply US is 36V.
The input end of the voltage transmitter 1 is connected with two ends of the discharge loop resistor R5, the output end of the voltage transmitter 1 is connected with the controller 2, and the voltage transmitter 1 measures the voltage of the discharge loop resistor R5 and sends the voltage to the controller 2. The voltage transmitter 1 has an input voltage range of +/-2000V and an output of +/-20 mA. The controller 2 is connected with the three-position switch S, and the controller 2 monitors the three-position switch S.
As shown in fig. 3, the controller 2 includes an analog input module 21, an a/D conversion module 22, a CPU23, a power supply module 24, a memory 25, an ethernet module 26, a switching value output module 27, a switching value input module 28, and a panel indicator 29, the analog input module 21 is connected to the a/D conversion module 22, and the CPU23 is connected to the a/D conversion module 22, the power supply module 24, the memory 25, the ethernet module 26, the switching value output module 27, the switching value input module 28, and the panel indicator 29, respectively. The power module 24 is externally connected with an auxiliary power supply to supply power to the controller 2. The ports a01 and a02 of the analog input module 21 are connected to the output of the voltage transmitter 1. The ports D01 to D06 of the switching value output module 27 are connected to the operation loops of S0 to S2 of the three-position switch S, respectively. Ports DI01 to DI06, one set of two, of the switching value input module 28 are connected to the switching position nodes of S0 to S2 of the three-position switch S, respectively. The CPU23 is connected with the LCD, and displays the measured voltage and the monitoring result of the monitoring device. The measured voltage and the monitoring result of the monitoring device can be uploaded to the power monitoring system through the Ethernet module 26.
When the monitoring device is used for monitoring the urban rail transit traction network to overhaul the grounding loop, because the same power supply subarea is supplied with power by two traction substations, and a visual grounding switch is installed in each traction substation, therefore, two monitoring devices are needed to be used for respectively monitoring the visual grounding switches in different traction substations. For example: the traction substation A and the traction substation B supply power for the power supply subarea M, and two monitoring devices are needed to be used for respectively monitoring the visual grounding switch 2131E and the visual grounding switch 2111E.
When the night contact network of the power supply zone M is stopped and overhauled, taking the grounding loop where the visual grounding switch 2131E of the monitoring traction substation a is located as an example, the operation process of the monitoring device is described as follows:
in the initial state, the three-position switch S is at the isolation position S0.
The first step is as follows: the controller 2 controls the three-position switch S to the discharge position S1, at which time the discharge loop resistor R5 is in electrical communication with the upper port of the visual grounding switch 2131E. The voltage U1 across the discharge loop resistor R5 is measured. The net pressure of the traction net is generally between 1000V and 1800V, and therefore, the normal set value USet1 of the net pressure of the traction net is set to 900V.
If the U1 is larger than or equal to the USet1, the traction network voltage is judged to be normal, and the positive cable connected to the contact network through the visual grounding switch 2131E is normal;
if U1 < USet1, it is preliminarily determined that the traction network voltage is abnormal, or the ground circuit in which the visual ground switch 2131E of the traction station a is located is abnormal.
The second step is that: a 2131 feeder line of the traction substation A and a contact switch 2113 are switched off, and the traction substation A is powered off to the power supply subarea M. After the outage, the visual grounding switch 2131E is connected to the positive cable of the overhead line system, the three-position switch S and the discharge loop resistor R5 to form a loop for communicating the overhead line system and the steel rail, and the monitoring device can discharge electricity to the traction power supply loop.
The third step: the voltage U2 across the discharge loop resistor R5 is measured continuously.
If U2 < USet2 and the condition of allowing the closing of the visual grounding switch 2131E is met, the fourth step is directly performed. The traction grid discharge set value USet2 is set to 600V.
And if the U2 is more than or equal to the USet2, the monitoring device continuously releases the induced charges of the traction net until the U2 is less than the USet2, and the fourth step is carried out.
The fourth step: and the visual grounding switch 2131E is switched on and is delayed for 2s.
The fifth step: the controller 2 controls the three-position switch S to the monitoring position S2, at which time the discharge loop resistor R5 is in electrical communication with the dc power source US. The voltage U3 across the discharge loop resistor R5 is measured. The visual ground return conduction set value USet3 is set to 10.08V.
If U3 is greater than or equal to USet3, judging that the visual grounding loop where the visual grounding switch 2131E is located is well conducted;
if U3 is less than USet3 and U1 is more than or equal to USet1, judging that the monitoring device is abnormal;
if U3 < USet3 and U1 < USet1, the ground circuit where the visual ground switch 2131E is located is disconnected.
In the fifth step, as can be seen from fig. 4 and the calculation results in table 1, the distance between the traction substation a and the traction substation B is long, and the measurement power supply of the traction substation B has almost no influence on the voltage measurement result of the traction substation a. Thus, the ground loop measurement of the traction substation B can be performed simultaneously with the ground loop of the traction substation a to save time.
TABLE 1 calculation and setting table for monitoring fixed value
| Item | (symbol) | Is normal | Fault of |
| Resistance of visual grounding switch 2131E connected to positive cable of contact network | R1（Ω） | 0.003268 | 10000 |
| Resistance of negative cable connected to steel rail through visual grounding switch 2131E | R2（Ω） | 0.006536 | 10000 |
| Contact network resistor between traction substation A and traction substation B | R3（Ω） | 0.0254 | 100000 |
| Traction apparatusRail resistance between substation A and traction substation B | R4（Ω） | 0.0154 | 100000 |
| Discharge loop resistor at A position of traction substation | R5（Ω） | 10000 | |
| Resistance of positive cable of monitoring loop from contact network to traction substation A | R6（Ω） | 0.000817 | 10000 |
| Resistance of negative cable connected to steel rail by monitoring loop at traction substation A | R7（Ω） | 0.006536 | 10000 |
| Resistance of positive cable connecting visual grounding switch 2111E to contact net | R1'（Ω） | 0.003268 | 100000 |
| Resistance of negative cable connected to steel rail through visual grounding switch 2111E | R2'（Ω） | 0.006536 | |
| Discharge loop resistor at B position of traction substation | R5'（Ω） | 170000 | |
| Resistance of positive cable of monitoring loop from contact network to traction substation B | R6'（Ω） | 0.000817 | 100000 |
| Resistance of negative cable connected to steel rail by monitoring loop at traction substation B | R7'（Ω） | 0.006536 | 100000 |
| Monitoring traction network voltage | U1（V） | ＞900 | 1-899 |
| Traction net pressure normal set value | USET1（V） | 900 | |
| Visual earthing switch closing set value | USET2（V） | 600 | |
| Direct current power supply | US（V） | 36 | |
| Theoretical calculation of monitoring voltage | U3（V） | 35.99 | |
| When the positive cable connected to the contact net through the visual grounding switch is broken, the voltage is monitored | 3.273 | ||
| When the negative cable connected to the steel rail through the visual grounding switch is broken, the voltage is monitored | 3.273 | ||
| When the monitoring loop is connected to the anode cable of the contact net and the line is broken, the voltage is monitored | 3.273 | ||
| Monitoring voltage when negative cable connected to steel rail in loop is broken | 3.273 | ||
| Influence of direct current source of traction substation B on monitoring result of traction substation A | 0-0.55 | ||
| Visual ground circuit conduction set value | USET3（V） | 10.80 |
When the grounding loops of the visual grounding switch 2131E of the traction substation A and the visual grounding switch 2111E of the traction substation B are both measured to be well conducted, the monitoring center prompts that the contact network partition M allows operation.
The present invention has been described in detail with reference to the embodiments, but the description is only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The scope of the invention is defined by the claims. The technical solutions of the present invention or those skilled in the art, based on the teaching of the technical solutions of the present invention, should be considered to be within the scope of the present invention, and all equivalent changes and modifications made within the scope of the present invention or equivalent technical solutions designed to achieve the above technical effects are also within the scope of the present invention.
Claims (5)
1. The utility model provides an urban rail transit pulls net and overhauls ground circuit broken string monitoring devices which characterized in that: the device comprises a direct current power supply US, a three-position switch S, a discharge loop resistor R5, a voltage transmitter and a controller, wherein one end of the discharge loop resistor R5 is connected with a steel rail, the other end of the discharge loop resistor R5 is connected with the negative electrode of the direct current power supply US and the upper port of a visual grounding switch through the three-position switch S, the positive electrode of the direct current power supply US is connected with a contact net, the input end of the voltage transmitter is connected with the two ends of the discharge loop resistor R5, the output end of the voltage transmitter is connected with the controller, the controller is connected with the three-position switch S, and the controller monitors the three-position switch S;
the first free end of the three-position switch S is an isolation position S0 and is suspended in the air; the second free end is a discharge position S1 and is connected with the upper port of the visual grounding switch; the third free end is a monitoring position S2 and is connected with the negative electrode of the direct current power supply US;
the operation flow is as follows:
the first step is as follows: the controller controls the three-position switch S to the S1 position, so that the discharge loop resistor R5 is electrically communicated with the upper port of the visual grounding switch, and the voltage U1 on the discharge loop resistor R5 is obtained through measurement; if U1 is larger than or equal to Uset1, judging that the visual grounding loop is intact; if U1 is less than Uset1, preliminarily judging that the voltage of the traction network is abnormal or the grounding loop where the visual grounding switch 2131E of the traction network A is positioned is abnormal; USet1 is a traction network voltage measurement set value;
the second step is that: the traction substation A and the traction substation B cut off the power supply subarea M;
the third step: measuring to obtain a voltage U2 on a discharge loop resistor R5, if U2 is more than or equal to USet2, continuously releasing the induced charge of the traction network by the monitoring device until U2 is less than USet2, and carrying out a fourth step; the USet2 is a set value for discharging the traction network;
the fourth step: the visual grounding switch 2131E is switched on and delays T;
the fifth step: the controller controls the three-position switch S to the S2 position, so that the discharge loop resistor R5 is electrically communicated with the direct-current power supply US, and the voltage U3 on the discharge loop resistor R5 is obtained through measurement;
if U3 is greater than or equal to USet3, judging that the grounding loop where the visual grounding switch 2131E of the traction station A is located is well conducted;
if U3 is less than USet3 and U1 is more than or equal to USet1, judging that the monitoring device is abnormal;
if U3 is less than USEt3 and U1 is less than USEt1, the visual grounding switch 2131E of the traction station A is judged to be in a broken line; USet3 is the ground loop turn-on setting.
2. The urban rail transit traction network overhaul ground circuit disconnection monitoring device of claim 1, wherein: the resistance value of the discharge loop resistor R5 is 10000 omega.
3. The urban rail transit traction network overhaul ground circuit disconnection monitoring device of claim 1, wherein: the output voltage of the dc power supply US is 36V.
4. The urban rail transit traction network overhaul ground circuit disconnection monitoring device of claim 1, wherein: the controller comprises an analog input module, an A/D conversion module, a CPU, a power supply module, a memory, an Ethernet module, a switching value output module and a switching value input module, wherein the analog input module is connected with the A/D conversion module, and the CPU is respectively connected with the A/D conversion module, the power supply module, the memory, the Ethernet module, the switching value output module and the switching value input module.
5. The urban rail transit traction network overhaul ground circuit broken line monitoring device of claim 1, which is characterized in that: USet1 for 900V, USet2 for 600V, USet3 for 10.08V, and T for 2s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211408721.7A CN115453412B (en) | 2022-11-11 | 2022-11-11 | Urban rail transit traction network maintenance grounding loop broken line monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211408721.7A CN115453412B (en) | 2022-11-11 | 2022-11-11 | Urban rail transit traction network maintenance grounding loop broken line monitoring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115453412A CN115453412A (en) | 2022-12-09 |
| CN115453412B true CN115453412B (en) | 2023-03-31 |
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