CN110412398B - Novel direct current traction power supply negative electrode unit frame leakage test and protection device - Google Patents
Novel direct current traction power supply negative electrode unit frame leakage test and protection device Download PDFInfo
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- CN110412398B CN110412398B CN201910793479.1A CN201910793479A CN110412398B CN 110412398 B CN110412398 B CN 110412398B CN 201910793479 A CN201910793479 A CN 201910793479A CN 110412398 B CN110412398 B CN 110412398B
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- 238000012360 testing method Methods 0.000 title claims abstract description 14
- 230000000087 stabilizing effect Effects 0.000 claims description 15
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 238000013500 data storage Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 abstract description 28
- 238000012545 processing Methods 0.000 abstract description 4
- 230000000875 corresponding effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Emergency Protection Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The invention relates to a novel direct-current traction power supply negative electrode unit frame leakage testing and protecting device which comprises a voltage reducing module, a measuring amplifier, a current divider and an analog quantity input module, wherein the voltage reducing module is connected with a frame, the voltage reducing module is connected with a negative electrode and the frame, the voltage reducing module is respectively and sequentially connected with the voltage measuring amplifier and the first analog quantity input module, the current divider is connected with the frame, and the current divider is respectively connected with the current measuring amplifier and the second analog quantity input module. After the structure is adopted, the traditional current relay measurement mode is changed, and a shunt, a measurement amplifier and an analog input continuous measurement mode are adopted; the traditional voltage relay measurement mode is changed, a measurement amplifier and analog quantity input continuous measurement mode is adopted, and the frame current and voltage values are detected in two directions through the measurement amplifier and are converted into analog quantities, so that further processing is convenient.
Description
Technical Field
The invention relates to the field of rail transit, in particular to a novel direct-current traction power supply negative electrode unit frame leakage testing and protecting device.
Background
In the rail traffic industry, line faults, large currents generated when vehicles start and stop, and the like are always important factors threatening safety operation. Therefore, in the direct current traction system, in order to ensure the safe operation of the direct current traction system and the contact net, various direct current protection is adopted, and various faults of the power supply system are rapidly and effectively removed. In order to protect the safety of the direct current equipment, various short circuit faults in the direct current equipment are timely removed, the direct current equipment is provided with frame protection at a negative electrode unit, once the direct current switch electrified equipment leaks or insulates and damages a direct current cabinet body, the frame protection acts to enable a related breaker to trip and power off, and the faults are effectively cut off, so that the safety of the equipment is protected. The direct current frame protects the two types of current and voltage. The current-type frame protects the main detection device housing from current to ground. Because direct current equipment and steel rail all adopt insulating installation, when insulating good, insulation resistance is very big, and current type frame protection can not reach the setting value, so adopts voltage type frame protection to detect rail ground voltage, guarantees equipment or steel rail insulation decline, also can the quick excision trouble.
The traditional current and voltage measurement method is shown in fig. 1, mainly, the current and voltage of the frame are monitored by a current and voltage relay, and the action value is output in a dry contact mode by setting current and voltage setting values through the relay. The method cannot display the current and voltage values of the frame in real time, and the action value and time cannot be continuously adjustable, so that the method has limitations.
Disclosure of Invention
In order to solve the existing technical problems, the invention provides a novel direct-current traction power supply negative electrode unit frame leakage testing and protecting device, which can change the traditional voltage and current relay measuring mode, continuously input measured data into an analog input module and realize continuous measurement and recording of current and voltage.
The invention comprises the following specific contents: the utility model provides a novel direct current pulls power supply negative pole unit frame leak test and protection device, includes step-down module, measuring amplifier, shunt and analog input module, step-down module links to each other with the frame, measuring amplifier includes voltage measuring amplifier and current measuring amplifier, analog input module includes first analog input module and second analog input module, step-down module connects negative pole and frame, step-down module connects gradually voltage measuring amplifier and first analog input module respectively, the frame is connected to the shunt, and current measuring amplifier and second analog input module are connected respectively to the shunt.
Further, a voltage stabilizing module is arranged between the voltage reducing module and the first measuring amplifier.
Further, the voltage reduction module comprises a plurality of voltage reduction resistors, the input end of the voltage reduction module is connected with the negative electrode, the output end of the voltage reduction module is connected with the frame protection ground, and the input end and the output end of the voltage stabilizing module are respectively connected with two ends of the voltage reduction resistors.
Further, the voltage stabilizing module comprises two voltage stabilizing diodes which are oppositely arranged and an adjustable resistor which is connected with the two voltage stabilizing diodes in parallel, and one end of the adjustable resistor is connected with a frame protection ground.
Further, the first analog input module and the second analog input module are respectively provided with a PLC, the PLC is connected with a display unit, and the display unit displays the measured voltage and current values.
Further, the PLC is connected with a steel rail potential limiting device.
Further, the PLC comprises a data storage module, wherein the data storage module stores voltage and current data and fault information.
Further, the PLC sets multi-section protection values of current and voltage.
The invention has the beneficial effects that: after the structure is adopted, the traditional current relay measurement mode is changed, and a shunt, a measurement amplifier and an analog input continuous measurement mode are adopted; the traditional voltage relay measurement mode is changed, a measurement amplifier and analog quantity input continuous measurement mode is adopted, and the frame current and voltage values are detected in two directions through the measurement amplifier and are converted into analog quantities, so that further processing is convenient.
Drawings
The following description of the embodiments of the invention is further defined by reference to the accompanying drawings.
FIG. 1 is a prior art method of measuring frame current voltage;
Fig. 2 is a schematic diagram of the novel dc traction powered negative unit frame leak test and protection device of the present invention.
Detailed Description
Fig. 1 is a schematic diagram of a method for measuring frame current and voltage in the prior art, and the main principle is that the method is realized through voltage and current relays, wherein the voltage relays of K13E1 and K13G1 are set with corresponding action threshold values through mechanical dialing, and three setting values of an element K4J1 current relay in the figure are respectively regulated by an inner concave angle screw, and a pointer is moved to the corresponding setting value. When the current and voltage of the frame reach the set corresponding action threshold values respectively, the corresponding element sends out an alarm signal or directly trips to the parallel circuit breaker cabinet. The technical scheme outputs in a dry contact mode, the frame voltage current value cannot be displayed in real time, and the action value and time cannot be continuously adjustable.
As shown in fig. 2, the technical scheme adopted in the embodiment changes the measurement mode of the traditional current relay, adopts the continuous measurement mode of the shunt, the measurement amplifier and the analog input, changes the measurement mode of the traditional voltage relay, and adopts the continuous measurement mode of the measurement amplifier and the analog input. The specific structure is as follows:
In the figure, the negative electrode of the system is connected with a steel rail, the direct current equipment shell is insulated from the positive electrode, a frame protection is arranged on the negative electrode unit, the frame protection ground is included, the current divider R12D1 is a non-slot current divider, one end of the current divider is connected with the frame protection ground, the other end of the current divider is connected with the system ground, leakage current of the direct current equipment shell to the ground is detected, and the leakage current is converted into a voltage signal. The output end of the current divider R12D1 is connected with the input end of the current measurement amplifier U12G1, and the output end of the current measurement amplifier U12G1 is connected with the second analog input module to transmit the current signal of the system to the second analog input module.
The voltage measurement is realized by a voltage reduction measurement mode through a voltage reduction resistor module R12C1, wherein the R12C1 comprises a plurality of voltage reduction resistors connected in series, and in the embodiment, one end of the voltage reduction resistor module R12C1 is connected with a system negative electrode, and the other end is connected with a frame protection ground. The two input ends of the voltage stabilizing module A12D1 are respectively connected with the two ends of the last voltage reducing resistor, the voltage stabilizing module A12D1 comprises two voltage stabilizing diodes which are oppositely and serially connected, a series circuit formed by the two voltage stabilizing diodes is also connected with an adjustable resistor in parallel, the adjusting end of the adjustable resistor is also connected with a frame protection ground, the two ends of the series circuit formed by the voltage stabilizing diodes are respectively connected with the two ends of the voltage reducing resistor, and the input end of the voltage measuring amplifier U12F1 is also connected. The output end of the voltage measurement amplifier U12F1 is connected with the voltage signal of the first analog input module output system.
The current divider in this embodiment does not require additional power, and the voltage measurement amplifier and the current measurement amplifier are both separately powered.
The first analog input module and the second analog input module of this embodiment are both provided with Programmable Logic Controllers (PLCs), and the PLCs are used for reading data received by the first analog input module and the second analog input module and performing corresponding processing.
The processing of the PLC to the voltage and current data comprises the steps of collecting and storing the voltage analog signals and the current analog signals at intervals, storing the collected data in a storage module inside the PLC, and displaying the specific data on a display unit connected with the PLC in real time. When the PLC detects that the voltage or current value reaches a set value, the PLC records data in a period of time after the fault occurs, and generates and stores a current type, a voltage type frame protection tripping action value and a peak value according to the data in a period of time before the fault occurs, and the current type and voltage type frame protection tripping action value and the peak value are stored in a fault data storage module. And distinguishing and accurately analyzing the fault cause through voltage and current action curve trend graphs before and after the fault occurs.
The PLC provides a protection function, is connected with the steel rail potential limiting device, judges that the system fails when detecting that the current and voltage value reaches a set value, and protects the system through the steel rail potential limiting device such as a power switch and the like.
In the above description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The foregoing description is only of a preferred embodiment of the invention, which can be practiced in many other ways than as described herein, so that the invention is not limited to the specific implementations disclosed above. While the foregoing disclosure has been described with reference to certain embodiments, it will be understood by those skilled in the art that various changes and modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. Any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention without departing from the technical solution of the present invention still falls within the scope of the technical solution of the present invention.
Claims (7)
1. The utility model provides a direct current pulls power supply negative pole unit frame leakage test and protection device which characterized in that: the voltage reduction module is connected with the frame, the measuring amplifier comprises a voltage measuring amplifier and a current measuring amplifier, the analog input module comprises a first analog input module and a second analog input module, the voltage reduction module is connected with the cathode and the frame, the voltage reduction module is respectively connected with the voltage measuring amplifier and the first analog input module in sequence, the current divider is connected with the frame, and the current divider is respectively connected with the current measuring amplifier and the second analog input module; the voltage reduction module comprises a plurality of voltage reduction resistors, the input end of the voltage reduction module is connected with the negative electrode, the output end of the voltage reduction module is connected with the frame protection ground, and the input end and the output end of the voltage stabilizing module are respectively connected with the two ends of the voltage reduction resistors.
2. The direct current traction powered negative unit frame leak test and protection device of claim 1, wherein: and a voltage stabilizing module is arranged between the voltage reducing module and the first measuring amplifier.
3. The direct current traction powered negative unit frame leak test and protection device of claim 2, wherein: the voltage stabilizing module comprises two voltage stabilizing diodes which are oppositely arranged and an adjustable resistor which is connected with the two voltage stabilizing diodes in parallel, and one end of the adjustable resistor is connected with a frame protection ground.
4. The direct current traction powered negative unit frame leak test and protection device of claim 1, wherein: the first analog input module and the second analog input module are respectively provided with a PLC, the PLC is connected with a display unit, and the display unit displays measured voltage and current values.
5. The direct current traction powered negative unit frame leak test and protection device of claim 4, wherein: the PLC is connected with a steel rail potential limiting device.
6. The direct current traction powered negative unit frame leak test and protection device of claim 4, wherein: the PLC comprises a data storage module, wherein the data storage module stores voltage and current data and fault information.
7. The direct current traction powered negative unit frame leak test and protection device of claim 4, wherein: the PLC sets multi-section protection values of current and voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910793479.1A CN110412398B (en) | 2019-08-27 | 2019-08-27 | Novel direct current traction power supply negative electrode unit frame leakage test and protection device |
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| CN201910793479.1A CN110412398B (en) | 2019-08-27 | 2019-08-27 | Novel direct current traction power supply negative electrode unit frame leakage test and protection device |
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| CN110412398A CN110412398A (en) | 2019-11-05 |
| CN110412398B true CN110412398B (en) | 2024-05-21 |
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| CN110412398A (en) | 2019-11-05 |
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