CN210690788U - Novel direct current traction power supply negative pole unit frame leak test and protection device - Google Patents
Novel direct current traction power supply negative pole unit frame leak test and protection device Download PDFInfo
- Publication number
- CN210690788U CN210690788U CN201921404643.7U CN201921404643U CN210690788U CN 210690788 U CN210690788 U CN 210690788U CN 201921404643 U CN201921404643 U CN 201921404643U CN 210690788 U CN210690788 U CN 210690788U
- Authority
- CN
- China
- Prior art keywords
- voltage
- module
- frame
- current
- analog input
- 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.)
- Withdrawn - After Issue
Links
- 238000012360 testing method Methods 0.000 title claims abstract description 15
- 230000009467 reduction Effects 0.000 claims description 15
- 230000000087 stabilizing effect Effects 0.000 claims description 13
- 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
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 18
- 230000002457 bidirectional effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 230000000875 corresponding effect Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model relates to a novel direct current pulls power supply negative pole unit frame leak test and protection device, including step-down module, measure amplifier, shunt and analog input module, step-down module links to each other with the frame, negative pole and frame are connected to the step-down module, step-down module connects gradually voltage measure amplifier and first analog input module respectively, current measure amplifier and second analog input module are connected respectively to shunt connection frame, shunt. After the structure is adopted, the traditional current relay measuring mode is changed, and a continuous measuring mode of a current divider, a measuring amplifier and analog quantity input is adopted; the traditional voltage relay measurement mode is changed, a measurement amplifier and analog input continuous measurement mode is adopted, the frame current and voltage values are detected in a bidirectional mode through the measurement amplifier, and the frame current and voltage values are converted into analog values to be further processed conveniently.
Description
Technical Field
The utility model relates to a track traffic field especially relates to a novel direct current pulls power supply negative pole unit frame leak test and protection device.
Background
In the rail transit industry, line faults, large current generated when vehicles are started and stopped and the like are always important factors threatening safe operation. Therefore, in the direct current traction system, in order to ensure the safe operation of the direct current traction system and a contact network, various direct current protection is adopted, and various faults of a power supply system are quickly and effectively removed. In order to protect the safety of the direct current equipment and timely remove various short-circuit faults in the direct current equipment, the direct current equipment is provided with a frame protection at a negative electrode unit, and once leakage or insulation damage of the direct current switch live equipment to a direct current cabinet body occurs, the frame protection acts to trip and power off related circuit breakers so as to effectively cut off faults, thereby protecting the safety of the equipment. The direct current frame protects the current distribution type and the voltage type. The current type frame protects the main detection device housing from current to ground. Because the direct current equipment and the steel rail are installed in an insulating mode, when the insulation is good and the insulation resistance is large, the current type frame protection cannot reach a setting value, the voltage type frame protection is adopted to detect the ground voltage of the rail, the insulation reduction of the equipment or the steel rail is guaranteed, and the fault can be removed quickly.
The traditional method for measuring current and voltage is shown in fig. 1, mainly realizes the monitoring of frame current and voltage by a current-voltage relay, and the action value is output by a dry contact method by setting current and voltage setting values through the relay. The method can not display the frame current and voltage values in real time, and the action value and the time can not be continuously adjusted, so the method has limitation.
SUMMERY OF THE UTILITY MODEL
For solving current technical problem, the utility model provides a novel direct current pulls power supply negative pole unit frame leak test and protection device can change traditional voltage, current relay measurement mode, with measured data continuous input to analog input module, realizes current-voltage's continuous measurement and record.
The specific contents of the utility model are as follows: the utility model provides a novel direct current pulls power supply negative pole unit frame leak testing and protection device, includes step-down module, measure amplifier, shunt and analog input module, step-down module links to each other with the frame, measure amplifier includes voltage measure amplifier and current measure amplifier, analog input module includes first analog input module and second analog input module, step-down module connection negative pole and frame, step-down module connects gradually voltage measure amplifier and first analog input module respectively, the frame is connected to the shunt, and current measure 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.
Furthermore, 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 stabilization module are respectively connected with two ends of the voltage reduction resistors.
Furthermore, 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.
Furthermore, the first analog input module and the second analog input module are both provided with a PLC (programmable logic controller), 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, and the data storage module stores voltage and current data and fault information.
Further, the PLC sets multi-segment protection values of current and voltage.
The utility model has the advantages that: after the structure is adopted, the traditional current relay measuring mode is changed, and a continuous measuring mode of a current divider, a measuring amplifier and analog quantity input is adopted; the traditional voltage relay measurement mode is changed, a measurement amplifier and analog input continuous measurement mode is adopted, the frame current and voltage values are detected in a bidirectional mode through the measurement amplifier, and the frame current and voltage values are converted into analog values to be further processed conveniently.
Drawings
The following further explains the embodiments of the present invention with reference to the drawings.
FIG. 1 is a prior art method of measuring frame current and voltage;
fig. 2 is the schematic diagram of the novel dc traction power supply negative electrode unit frame leak test and protection device of the present invention.
Detailed Description
Fig. 1 shows a schematic diagram of a method for measuring frame current and voltage in the prior art, which is implemented by a voltage relay and a current relay, wherein the K13E1 and K13G1 voltage relays set corresponding action thresholds through mechanical dialing, and in the diagram, three setting values of an element K4J1 current relay, respectively 80, 120 and 160A, are adjusted by concave angle screws, and a pointer is moved to the corresponding setting values. When the current and voltage of the frame respectively reach the set corresponding action threshold, the corresponding element sends out an alarm signal or directly trips to jump the corresponding breaker cabinet in parallel. The technical scheme is output in a dry contact mode, the voltage and current values of the frame cannot be displayed in real time, and the action value and the time cannot be continuously adjusted.
As shown in fig. 2, the technical solution adopted in this embodiment changes the measurement mode of the conventional current relay, and adopts a continuous measurement mode of the current divider + the measurement amplifier + the analog input, and changes the measurement mode of the conventional voltage relay, and adopts a continuous measurement mode of the measurement amplifier + the analog input. The specific structure is as follows:
in the figure, the cathode of the system is connected with a steel rail, the shell of the direct current equipment is insulated from the anode, a frame protection is arranged on a cathode unit and comprises a frame protection ground, a shunt R12D1 is a non-slot type shunt, one end of the shunt is connected with the frame protection ground, the other end of the shunt is connected with the system ground, the leakage current of the shell of the direct current equipment 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 measuring amplifier U12G1, and the output end of the current measuring amplifier U12G1 is connected with the second analog quantity input module to transmit the current signal of the system to the second analog quantity input module.
The voltage measurement is realized by a voltage reduction measurement mode through a voltage reduction resistance module R12C1, the R12C1 comprises a plurality of series-connected voltage reduction resistances, in the embodiment, one end of the voltage reduction resistance module R12C1 is connected with the negative pole of the system, and the other end is connected with the frame protection ground. Two input ends of the voltage stabilizing module A12D1 are respectively connected with two ends of the last step-down resistor, the voltage stabilizing module A12D1 comprises two voltage stabilizing diodes which are oppositely connected in series, a series circuit formed by the two voltage stabilizing diodes is also connected with an adjustable resistor in parallel, an adjusting end of the adjustable resistor is also connected with a frame protection ground, two ends of the series circuit formed by the voltage stabilizing diodes are respectively connected with two ends of the step-down resistor, and the two ends of the series circuit are also connected with an input end of a voltage measuring amplifier U12F 1. The output end of the voltage measuring amplifier U12F1 is connected with the voltage signal of the first analog quantity input module output system.
The current divider in the embodiment does not need to be additionally supplied with power, and the voltage measuring amplifier and the current measuring amplifier both need to be separately supplied with power.
The first analog input module and the second analog input module of this embodiment are both provided with a programmable logic controller PLC, and the PLC is configured to read data received by the first analog input module and the second analog input module and perform corresponding processing.
The PLC processes voltage and current data including collection and storage, collects voltage analog signals and current analog signals at intervals, stores the collected data in a storage module inside the PLC and displays the specific data on a display unit connected with the PLC in real time. By presetting multi-section protection fixed values of frame voltage and current, when the PLC detects that the voltage or current value reaches a set value, data in a period of time after a fault occurs are recorded, and a current type and voltage type frame protection tripping action value and a peak value are generated and stored by combining the data in the period of time before the fault occurs and are stored in a fault data storage module. And identifying the fault reason through a voltage and current action curve trend graph before and after the fault occurs and carrying out accurate analysis.
The PLC provides a protection function, is connected with the steel rail potential limiting device, judges that the system has faults when detecting that the current voltage value reaches a set value, and realizes the protection of the system through the steel rail potential limiting device such as a power switch.
In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the invention. The foregoing description is only illustrative of the preferred embodiments of the invention, which can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. All the contents that do not depart from the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention all still belong to the protection scope of the technical solution of the present invention.
Claims (8)
1. The utility model provides a novel direct current pulls power supply negative pole unit frame leak testing and protection device which characterized in that: including step-down module, measuring amplifier, shunt and analog input module, the 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, negative pole and frame are connected to the step-down module, voltage measuring amplifier and first analog input module are connected gradually respectively to the step-down module, the frame is connected to the shunt, and current measuring amplifier and second analog input module are connected respectively to the shunt.
2. The novel direct current traction power supply negative electrode unit frame leakage testing and protecting device according to claim 1, is characterized in that: and a voltage stabilizing module is arranged between the voltage reducing module and the first measuring amplifier.
3. The novel direct current traction power supply negative electrode unit frame leakage testing and protecting device according to claim 2, is characterized in that: 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 stabilization module are respectively connected with the two ends of the voltage reduction resistors.
4. The novel direct current traction power supply negative electrode unit frame leakage testing and protecting device according to claim 2, is characterized in that: 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.
5. The novel direct current traction power supply negative electrode unit frame leakage testing and protecting device according to claim 1, is characterized in that: the first analog input module and the second analog input module are both provided with a PLC (programmable logic controller), the PLC is connected with a display unit, and the display unit displays the measured voltage and current values.
6. The novel direct current traction power supply negative electrode unit frame leakage testing and protecting device according to claim 5, is characterized in that: the PLC is connected with a steel rail potential limiting device.
7. The novel direct current traction power supply negative electrode unit frame leakage testing and protecting device according to claim 5, is characterized in that: the PLC comprises a data storage module, and the data storage module stores voltage and current data and fault information.
8. The novel direct current traction power supply negative electrode unit frame leakage testing and protecting device according to claim 5, is characterized in that: the PLC sets multi-segment protection values for current and voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921404643.7U CN210690788U (en) | 2019-08-27 | 2019-08-27 | Novel direct current traction power supply negative pole unit frame leak test and protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921404643.7U CN210690788U (en) | 2019-08-27 | 2019-08-27 | Novel direct current traction power supply negative pole unit frame leak test and protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210690788U true CN210690788U (en) | 2020-06-05 |
Family
ID=70886929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921404643.7U Withdrawn - After Issue CN210690788U (en) | 2019-08-27 | 2019-08-27 | Novel direct current traction power supply negative pole unit frame leak test and protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210690788U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412398A (en) * | 2019-08-27 | 2019-11-05 | 镇江大全赛雪龙牵引电气有限公司 | A kind of Novel DC traction power supply negative pole unit frame leak-testing and protective device |
| CN111693863A (en) * | 2020-07-29 | 2020-09-22 | 中铁宝桥集团有限公司 | Single-track switch position switch rapid detection device and detection method thereof |
-
2019
- 2019-08-27 CN CN201921404643.7U patent/CN210690788U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412398A (en) * | 2019-08-27 | 2019-11-05 | 镇江大全赛雪龙牵引电气有限公司 | A kind of Novel DC traction power supply negative pole unit frame leak-testing and protective device |
| CN110412398B (en) * | 2019-08-27 | 2024-05-21 | 镇江大全赛雪龙牵引电气有限公司 | Novel direct current traction power supply negative electrode unit frame leakage test and protection device |
| CN111693863A (en) * | 2020-07-29 | 2020-09-22 | 中铁宝桥集团有限公司 | Single-track switch position switch rapid detection device and detection method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202230137U (en) | Power cell insulation detection system for electric automobile | |
| CN101261301A (en) | Locomotive control loop grounding detection circuit and grounding detection method and wire break detection method | |
| CN101738560A (en) | Unbalanced electric bridge-based grounding detection circuit for locomotive control loop | |
| CN105842540A (en) | Method for detecting DC bus insulation resistance | |
| CN105548867A (en) | Diagnostic system and diagnostic method of contact state of high-voltage circuit breaker | |
| CN104880640A (en) | DC traction power supply system frame electric leakage monitoring apparatus | |
| WO2014086381A1 (en) | Method for isolation monitoring | |
| CN210690788U (en) | Novel direct current traction power supply negative pole unit frame leak test and protection device | |
| CN105823954A (en) | Detection device for grounding point of storage battery pack, method and DC power supply system | |
| CN201181321Y (en) | Earthing detection circuit of locomotive control circuit | |
| CN104330639A (en) | Novel industrial UPS battery internal resistance online testing device | |
| CN113176479B (en) | Series arc detection method for low-voltage distribution network | |
| CN204374346U (en) | The pick-up unit of battery pack earth point, DC power system | |
| US6830843B2 (en) | Method for controlling the quality of the coolant for fuel cell systems | |
| CN110412398B (en) | Novel direct current traction power supply negative electrode unit frame leakage test and protection device | |
| CN112782571A (en) | Method, device and system for monitoring service life of circuit breaker | |
| CN109470944B (en) | Fault early warning method for power protection equipment | |
| CN208753985U (en) | Intelligent lightning protection device and the lightning protection box for protecting three-phase circuit | |
| CN215894738U (en) | High tension switchgear PT cabinet operation monitoring devices | |
| CN204719166U (en) | DC traction power-supply system framework leakage monitoring device | |
| CN108008192B (en) | Overvoltage protector with piezoresistor fault monitoring function | |
| CN102315620B (en) | Electronic tripper and direct-current circuit breaker provided with same | |
| CN106814294A (en) | Based on bilateral bridge direct-current charging post insulation detecting circuit and detection method | |
| CN207518256U (en) | Triple negative ground voltage protections | |
| CN207280615U (en) | High-voltage circuitbreaker temperature online monitoring system based on wireless communication |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20200605 Effective date of abandoning: 20240521 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20200605 Effective date of abandoning: 20240521 |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |