CN111693893A - DC600V improved power supply for electric locomotive to passenger car and online insulation detection circuit thereof - Google Patents
DC600V improved power supply for electric locomotive to passenger car and online insulation detection circuit thereof Download PDFInfo
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- CN111693893A CN111693893A CN202010536362.8A CN202010536362A CN111693893A CN 111693893 A CN111693893 A CN 111693893A CN 202010536362 A CN202010536362 A CN 202010536362A CN 111693893 A CN111693893 A CN 111693893A
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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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Abstract
The DC600V improved power supply for electric locomotive to bus and its on-line insulation detection circuit belong to the technical field of electric locomotive, and include two pairs of earth balance resistors connected between the DC positive and negative buses, the two pairs of earth balance resistors are earthed, and at the same time, the on-line insulation detection circuit adopts the unbalanced bridge method to measure and calculate the insulation resistance of the DC power supply to the locomotive earth, and when the fault occurs, it will alarm immediately and output control signal to prevent earthing. The on-line insulation detection circuit is added on the improved power supply, the on-line insulation detection is carried out on the locomotive in real time in the running process, the detection circuit is simple and reliable, an alarm signal is immediately output when the insulation abnormality occurs, and the occurrence of ground faults can be avoided; the large-resistance insulation balance resistor of 20K-50K is selected to ensure that the voltages of the positive end and the negative end are equal to each other, so that the safety performance of the passenger train is greatly improved, and any point of the whole train is grounded and is in a safe state.
Description
Technical Field
The invention belongs to the technical field of electric locomotives, and particularly relates to a DC600V improved power supply for an electric locomotive to a passenger car and an online insulation detection circuit thereof.
Background
With the continuous maturity of the operation technology of the railway passenger car, the manufacturing technology of the carriage of the passenger car is also continuous and perfect, and the operation safety is also greatly improved. But at present, the power supply safety of the passenger car is seriously influenced, and the power supply safety is not designed in the passenger car body, but is derived from a DC600V power supply system of a traction locomotive. In order to avoid that the floating ground voltage generated by the Shaoshan electric locomotive enters the passenger car to affect the safety of passengers, a ground balancing resistor of 600 omega is forced to be added, see figure 1, and the structure is also commonly applied to the harmonious electric locomotive in the field, and in fact, the whole harmonious electric locomotive is completely isolated from the ground and cannot generate the floating ground voltage, and the design is redundant. Due to the fact that the resistance value of the balance resistor is too small, leakage current and the online insulation detection standard are seriously reduced, and misjudgment often occurs. In this state, as long as the interior of the train is grounded, the protective circuit can burn the equipment with a little time delay, and the potential safety hazard is very large. According to the technical conditions of a TB/T3063-2002 passenger train DC600V power supply system, the online insulation value of DC600V of each compartment of a passenger train is more than 100K omega-600K omega, but the parallel balance resistance is small, so that the online detection of the insulation resistance value of more than 2K cannot be implemented, the execution standard is changed into TB/T3063-2011, the online insulation value is qualified when being more than 2K omega, and the international minimum standard of online insulation is created. In order to keep consistent with the running insulation state of the train, a ground power supply detection is also required to be additionally provided with a ground balance resistor of 600 omega on a power supply, so that the insulation of the whole train is completely in an abnormal detection state.
Because the resistance value of the harmonious electric locomotive to the balance resistor is too small, the fluctuation of V + and V-of the 600V power supply easily causes the misjudgment of the leakage current detection device, and often causes the contradiction between the locomotive service section and the passenger transport section.
Disclosure of Invention
In order to solve the technical problems, the invention discloses a DC600V improved power supply for an electric locomotive to a passenger car and an online insulation detection circuit thereof, wherein a main loop, an auxiliary loop and a control loop of the electric locomotive all adopt passive grounding detection, so that the voltages to earth at two ends of each independent loop are completely balanced, the generation of the floating earth voltage is completely inhibited, the voltages to earth at a positive end and a negative end of 600V are ensured to be equal, an online insulation detection device is added, and after a fault is detected, an alarm signal is output to prevent the ground fault.
The invention adopts the following specific technical scheme:
the improved DC600V power supply for electric locomotive to bus and its on-line insulation detection circuit includes two pairs of earth balance resistors connected between the positive and negative DC buses, the two pairs of earth balance resistors are earthed to ensure the voltages of both ends to earth and to make any point of the whole train in safe state, and at the same time, the two balance resistors are tested for on-line insulation.
Preferably, the detection circuit adopted by the unbalanced bridge method is provided with compensation resistors R in parallel on the side of the balance resistor to the ground of the locomotive close to the positive side and the negative side of the direct-current power supply respectively7And a compensation resistor R8The switch K1 and the switch K2 are used for controlling whether to be connected or not.
Preferably, the compensation resistor R7A sampling resistor R is connected in parallel with the switch K14Compensating resistor R8A sampling resistor R is connected in parallel with the switch K26Respectively collecting voltage values V thereto1、V2。
Preferably, when the voltage V is collected1>V2When the compensation resistor R is connected in a closed mode, the switch K2 is controlled to be connected8Artificially lowering V1Voltage to ensure detection accuracy.
Preferably, when the voltage V is collected2>V1When the compensation resistor R is connected in a closed mode, the switch K1 is controlled to be connected7Artificially lowering V2Voltage to ensure detection accuracy.
Preferably, the data detected by the online insulation detection circuit can be output through a 485 serial port.
Preferably, the improved power supply meets the TB/T3063-2002 standard.
Preferably, the improved power supply adopts a pair balance resistor of 20K-50K.
The invention has the beneficial effects that:
(1) according to the invention, the on-line insulation detection circuit is added on the DC600V improved power supply, the on-line insulation detection is carried out in real time in the running process of the electric locomotive, once the insulation is abnormal, an alarm signal is immediately output, and the occurrence of ground fault can be avoided;
(2) the online insulation detection circuit is simple, and the judgment method is simple, convenient and reliable;
(3) the invention selects the large-resistance insulation ground balance resistor of 20K-50K, ensures that the voltages of the positive end and the negative end of the DC600V are equal to the voltage of the ground, greatly improves the safety performance of the passenger train and ensures that any point of the whole train is in a safe state when being grounded.
Drawings
FIG. 1 is a diagram of prior art harmonious and Shaoshan electric locomotives with DC600V power supply balancing resistance wiring for passenger cars;
FIG. 2 is a diagram of a harmonic electric locomotive to passenger car DC600V modified power supply balancing resistance wiring;
fig. 3 is a schematic diagram of DC600V improved power supply online insulation detection.
Detailed Description
The invention is further illustrated by the following specific examples. The starting materials and methods employed in the examples of the present invention are those conventionally available in the market and conventionally used in the art, unless otherwise specified.
Example 1
A main loop, an auxiliary loop and a control loop of the harmonious electric locomotive are detected by adopting passive grounding, as shown in figure 2, the harmonious electric locomotive provides a DC600V improved power supply for a passenger car, two pairs of grounding balance resistors between a direct current positive bus and a direct current negative bus are connected, a large resistor with the resistance value of 50K is selected as the pair of the grounding balance resistors, the two pairs of the grounding balance resistors are grounded, the voltages of the positive end and the negative end to the ground are equal, any point of the whole train is grounded in a safe state, meanwhile, online insulation detection circuits are added to the positive end and the negative end of the DC600V direct current power supply, the online insulation detection circuits detect the insulation resistors in real time, test data can be output through 485 serial ports, an alarm is given immediately when a fault occurs, a.
As shown in FIG. 3, the on-line insulation detection circuit measures and calculates the insulation resistance R of the DC power supply to the locomotive ground by using the unbalanced bridge method+And R-. The unbalanced bridge circuit is respectively arranged near the positive and negative pairs of the DC power supplyThe insulation resistance side of the locomotive ground is provided with a compensation resistor R in parallel7And a compensation resistor R8Compensating resistor R7And a compensation resistor R8Respectively connected with switch K1 and switch K2 in series, and switch on/off control is connected with resistance compensation, and switch K1 is connected with resistor R in parallel3And a sampling resistor R4Switch K2 is connected in parallel with a resistor R5And a sampling resistor R6To the sampling resistors R, respectively4、R6Detecting voltage value V in real time1、V2。
According to the analysis of the unbalanced bridge method, the following results can be obtained:
when the switches K1 and K2 are all off, the direct current positive end is grounded
DC negative terminal to ground voltage
When the switch K1 is closed, set V1、V2Will become V1'、V2', the DC positive terminal is grounded at the moment
DC negative terminal to ground voltage
Design R3、R4Far greater than R+The current that it passes is negligible, and then,
wherein, V3、V4、V5、V6Since both can be detected, the insulation resistance R at that time can be determined by combining the formulas (1) and (2)+And R-。
When the switch K2 is closed, the same principle can be obtained
Therefore, we can determine the insulation resistance R at this time by combining the formulas (1) and (3)+And R-。
′
Insulation resistor R of direct current power supply facing locomotive ground+Test value R for on-line insulation detection circuit+Balance resistance R to ground1The parallel connection value is removed, and the insulation resistance test value of the direct current power supply which is detected by the online insulation circuit and is over against the locomotive ground is obtained
Similarly, the insulation resistance test value of the direct current power supply negative to the locomotive ground is obtained
Continuously detecting the change of the insulation state while the locomotive is running, and simultaneously, when the voltage V is collected1>V2When the direct current power supply is grounded, the negative end of the direct current power supply is judged, and the switch K2 is controlled to be closed and connected to the compensation resistor R8Equivalent to artificially lowering V1Voltage to ensure detection accuracy; when voltage V is collected2>V1When the direct current power supply is grounded, the positive end of the direct current power supply is judged, and the switch K1 is controlled to be closed and connected to the compensation resistor R7Equivalent to artificially lowering V2Voltage to ensure detection accuracy.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (8)
1. The improved DC600V power supply for electric locomotive to bus and its on-line insulation detection circuit features that it includes two pairs of earth balance resistors connected between the positive and negative DC buses, the two pairs of earth balance resistors are earthed to ensure the voltages to earth in both ends of the train are equal, and the on-line insulation detection is performed on the two balance resistors.
2. The improved DC600V power supply for electric locomotive to passenger car and its on-line insulation detection circuit as claimed in claim 1, wherein the detection circuit adopted by the unbalanced bridge method is provided with compensation resistors R in parallel at the side of the balance resistor to ground near the positive and negative of the DC power supply to the locomotive ground respectively7And a compensation resistor R8The switch K1 and the switch K2 are used for controlling whether to be connected or not.
3. The improved electric locomotive passenger car DC600V power supply and online insulation detection circuit thereof as claimed in claim 2, wherein the compensation resistor R7A sampling resistor R is connected in parallel with the switch K14Compensating resistor R8A sampling resistor R is connected in parallel with the switch K26Respectively collecting voltage values V thereto1、V2。
4. The improved DC600V power supply for electric locomotive to passenger car and its on-line insulation detection circuit as claimed in claim 3, wherein when voltage V is collected1＞V2When the compensation resistor R is connected in a closed mode, the switch K2 is controlled to be connected8Artificially lowering V1Voltage to ensure detection accuracy.
5. The improved DC600V power supply for electric locomotive to passenger car and its on-line insulation detection circuit as claimed in claim 3, wherein when voltage V is collected2＞V1When the compensation resistor R is connected in a closed mode, the switch K1 is controlled to be connected7Artificially lowering V2Voltage to ensure detection accuracy.
6. The improved power supply of DC600V for electric locomotive to passenger car and the on-line insulation detection circuit thereof as claimed in claim 1, wherein the data detected by the on-line insulation detection circuit can be outputted via 485 serial port.
7. The improved electric locomotive passenger car DC600V power supply and online insulation detection circuit thereof as claimed in claim 1, wherein said improved power supply meets TB/T3063-2002 standard.
8. The improved power supply of DC600V for electric locomotives and passenger cars and the on-line insulation detection circuit thereof as claimed in claim 8, wherein said improved power supply employs a balanced resistance to ground of 20K-50K.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010536362.8A CN111693893A (en) | 2020-06-12 | 2020-06-12 | DC600V improved power supply for electric locomotive to passenger car and online insulation detection circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010536362.8A CN111693893A (en) | 2020-06-12 | 2020-06-12 | DC600V improved power supply for electric locomotive to passenger car and online insulation detection circuit thereof |
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| Publication Number | Publication Date |
|---|---|
| CN111693893A true CN111693893A (en) | 2020-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010536362.8A Pending CN111693893A (en) | 2020-06-12 | 2020-06-12 | DC600V improved power supply for electric locomotive to passenger car and online insulation detection circuit thereof |
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| Country | Link |
|---|---|
| CN (1) | CN111693893A (en) |
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2020
- 2020-06-12 CN CN202010536362.8A patent/CN111693893A/en active Pending
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