CN113625021B - Protection device, method and equipment for electric leakage detection resistor - Google Patents
Protection device, method and equipment for electric leakage detection resistor Download PDFInfo
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- CN113625021B CN113625021B CN202010373003.5A CN202010373003A CN113625021B CN 113625021 B CN113625021 B CN 113625021B CN 202010373003 A CN202010373003 A CN 202010373003A CN 113625021 B CN113625021 B CN 113625021B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/36—Overload-protection arrangements or circuits for electric measuring instruments
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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 application discloses protection device, method and equipment of leakage detection resistance, and the device includes: one end of the grounding control contactor is connected with the negative electrode of the power grid; the leakage detection circuit is respectively connected with the other end of the grounding control contactor and the target body; the leakage detection loop comprises a leakage detection resistor; and the controller is respectively connected with the grounding control contactor and the leakage detection loop, and controls the grounding control contactor to be disconnected or closed according to the first voltage value of the leakage detection resistor. The device can protect the leakage detection resistor from being burnt out when the leakage fault occurs.
Description
Technical Field
The present invention relates generally to the field of resistor protection technologies, and in particular, to a protection device, method, and apparatus for a leakage detection resistor.
Background
With the development of science and technology, people enter an electronic era, including a high-speed passenger transport era also spanned by railways used by people for traveling, and the trains provide great convenience for the traveling of people. At present, a train is mainly powered by a power grid, and once a fault occurs at a train end when the power grid is powered, such as a leakage fault, the train cannot run.
In the prior art, after the electric network leaks electricity, only the vehicle contactor can be controlled to be disconnected, the electric network is still in an electric leakage state, and the electric leakage detection resistor is equivalent to a load added between the positive pole and the negative pole of the electric network, so that the electric leakage detection resistor is heated and burnt out, and the vehicle electric leakage detection resistor cannot be protected.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a protection device, method and apparatus for a leakage detection resistor.
In a first aspect, the present application provides a protection device for a leakage detection resistor, comprising:
one end of the grounding control contactor is connected with the negative electrode of the power grid;
the leakage detection circuit is respectively connected with the other end of the grounding control contactor and the target body; the leakage detection loop comprises a leakage detection resistor;
and the controller is respectively connected with the grounding control contactor and the leakage detection loop, and controls the grounding control contactor to be disconnected or closed according to the first voltage value of the leakage detection resistor.
In one embodiment, the leakage detection circuit further includes:
and the negative electrode of the backward diode is connected with the other end of the grounding control contactor, the positive electrode of the backward diode is connected with one end of the electric leakage detection resistor, and the other end of the electric leakage detection resistor is connected with the target body.
In one embodiment, the leakage detection circuit further includes:
and the voltage sensor is connected with the leakage detection resistor in parallel and is connected with the controller, and the controller acquires the voltage value of the leakage detection resistor through the voltage sensor.
In one embodiment, the protection device further comprises:
one end of the high-speed circuit breaker is connected with the positive pole of the power grid;
one end of the positive contactor is connected with the other end of the high-speed circuit breaker, and the other end of the positive contactor is connected with one end of the load set;
the other end of the load set is connected with the negative electrode of the power grid;
the high-speed circuit breaker and the positive contactor are respectively connected with the controller, and the controller controls the high-speed circuit breaker and the positive contactor to be disconnected or attracted according to the first voltage value of the electric leakage detection resistor.
In one embodiment, one end of the grounding control contactor connected with the negative pole of the power grid is also connected with the other end of the load set;
or the like, or, alternatively,
and one end of the grounding control contactor connected with the leakage detection loop is also connected with the other end of the load set.
In one embodiment, the protection device further comprises:
one end of the negative contactor is connected with the other end of the load set, and the other end of the negative contactor is connected with the negative electrode of the power grid;
the negative contactor is connected with the controller, and the controller controls the negative contactor to be disconnected or closed according to the first voltage value of the leakage detection resistor.
In one embodiment, one end of the grounding control contactor, which is connected with the negative pole of the power grid, is also connected with the other end of the negative pole contactor;
or the like, or, alternatively,
and one end of the grounding control contactor connected with the leakage detection loop is also connected with the other end of the negative contactor.
In a second aspect, the present application provides a protection method for a leakage detection resistor, including:
acquiring a first voltage value of a leakage detection resistor;
and when the first voltage value of the leakage detection resistor is greater than or equal to the voltage threshold value, controlling the grounding control contactor to be disconnected.
In one embodiment, before obtaining the first voltage value of the leakage detection resistor, the method further includes:
determining that the target body is in a low-pressure state;
and controlling the grounding to control the attraction of the contactor.
In one embodiment, before obtaining the first voltage value of the leakage detection resistor, the method further includes:
determining that the target body is in a high-pressure state;
controlling the grounding control contactor, the high-speed circuit breaker, the anode contactor and the cathode contactor to be attracted;
when the first voltage value of the leakage detection resistor is greater than or equal to the voltage threshold, the grounding control contactor is controlled to be opened, and the method comprises the following steps:
when the first voltage value of the leakage detection resistor is larger than or equal to the voltage threshold value, the high-speed circuit breaker, the positive contactor and the negative contactor are controlled to be disconnected;
after the preset time, acquiring a second voltage value of the leakage detection resistor R;
and when the second voltage value of the leakage detection resistor is greater than or equal to the voltage threshold value, controlling the grounding control contactor to be disconnected.
In a third aspect, the present application provides a protection device for a leakage detection resistor, including a memory, a processor, and a program stored in the memory and executable on the processor, wherein the processor implements any one of the above protection methods for a leakage detection resistor when executing the program.
In the device, the grounding control contactor is arranged between the negative electrode of the power grid and the leakage detection circuit, and when a leakage fault occurs, the grounding control contactor is disconnected to protect the leakage detection resistor in the leakage detection circuit and prevent the leakage detection resistor from being burnt out.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a schematic structural diagram of a protection device for a leakage detection resistor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a protection device of a leakage detection resistor according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a protection device of a leakage detection resistor according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a protection device of a leakage detection resistor according to another embodiment of the present invention;
fig. 5 is a schematic flowchart of a protection method for a leakage detection resistor according to an embodiment of the present invention;
fig. 6 is a schematic flowchart of a protection method for a leakage detection resistor according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of a protection device for a leakage detection resistor according to an embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The existing leakage protection device of a train power supply system can only control a vehicle contactor to be disconnected after electric leakage of a power grid, the power grid is still in a leakage state, and a leakage detection resistor is equivalent to a load and is added between a positive pole and a negative pole of the power grid, so that the leakage detection resistor generates heat, and the vehicle leakage detection resistor cannot be protected.
The system of the embodiment of the application provides a protection device for the leakage detection resistor, which can not only detect the electric leakage of the power grid after the electric leakage of the power grid and disconnect the vehicle contactor, but also protect the leakage detection resistor to prevent burning out.
In the embodiment of the application, the protection device of the leakage detection resistor can be used for trains, other vehicles with different high-voltage principles and the like. For example, the protection device of the leakage detection resistor can be used for a rail vehicle. The following embodiments are illustrated by taking a train in which the protection device of the leakage detection resistor is used for power supply of a power grid as an example.
Referring to fig. 1, a schematic structural diagram of a protection device for a leakage detection resistor according to an embodiment of the present application is shown.
As shown in fig. 1, a protection device for a leakage detecting resistor includes:
one end of the grounding control contactor KM4 is connected with the negative pole of the power grid 10;
the leakage detection circuit 20 is connected with the other end of the grounding control contactor KM4 and the target body 30 respectively; the leakage detection circuit 20 includes a leakage detection resistor R;
and the controller 40 are respectively connected with the grounding control contactor KM4 and the leakage detection loop 20, and the controller 40 controls the grounding control contactor KM4 to be disconnected or closed according to the voltage value of the leakage detection resistor R.
Specifically, the grounding control contactor KM4 can adopt an alternating current contactor, and the circuit can be switched on or off by attracting and disconnecting the grounding control contactor KM 4.
The target 30 is a target to which a protection device of the leakage detecting resistor can be applied. For example, when the protection device of the electrical leakage detection resistor is applied to a train, the target body 30 is a train body. The target 30 described below is shown as a train body.
The power grid 10 may be used to power trains, which are primarily powered by a dc rail. In which a fault, such as a leakage fault, may occur when the power grid 10 supplies power to the train. Since the train body is grounded, the leakage detecting circuit 20 is connected to the target 30, that is, the leakage detecting circuit 20 is also grounded.
The leakage detection circuit 20 is used to detect whether the circuit has a leakage fault. When detecting that a line power grid has an electric leakage fault, the controller 40 controls the grounding control contactor KM4 to be disconnected, namely, a circuit is cut off, and as the grounding control contactor KM4 is connected between the power grid and the electric leakage detection loop 20, no current passes through the electric leakage detection resistor R in the electric leakage detection loop 20, so that the electric leakage detection resistor R is prevented from being damaged due to heating caused by passing the current for a long time.
Whether the line power grid has the leakage fault or not is detected according to the first voltage value U of the leakage detection resistor R, when the first voltage value U of the leakage detection resistor R is larger than or equal to aV, the line power grid has the leakage fault, the controller 40 is required to control the grounding control contactor KM4 to be disconnected, and when U is smaller than aV, the line power grid is normal, and the controller 40 controls the grounding control contactor KM4 to keep in a pull-in state. Where a is a fault voltage threshold, which may be set based on experience or different scenarios. Illustratively, aV may be set to 100V, for example.
In this embodiment, the voltage value at the end of the leakage detection resistor is collected in real time through control, so that the leakage condition of the target can be identified.
Optionally, the leakage detecting circuit 20 may further include: the voltage sensor VH is connected in parallel with the leakage detection resistor R, the voltage sensor VH is connected to the controller 40, and the controller 40 obtains the voltage value of the leakage detection resistor R through the voltage sensor VH.
Specifically, the voltage sensor VH can be connected in parallel with the part to be measured to obtain a voltage value of the part to be measured. In this embodiment, the voltage sensor VH is connected in parallel with the leakage detection resistor R, so that the voltage value of the leakage detection resistor R can be obtained and transmitted to the controller 40, and the controller 40 can control the grounding control contactor KM4 to be disconnected or closed according to the obtained voltage value of the leakage detection resistor R.
The voltage sensor VH may be a voltage hall sensor. It should be noted that the voltage hall sensor VH may be an independent component, or may be integrated in the controller 40, which is not limited herein.
Optionally, the leakage detecting circuit 20 may further include: and the cathode of the reverse diode VT is connected with the other end of the grounding control contactor KM4, the anode of the reverse diode VT is connected with one end of the leakage detection resistor R, and the other end of the leakage detection resistor R is connected with the target body 30.
Specifically, the reverse diode VT is a diode having a reverse conductivity superior to a forward conductivity, and the reverse diode has a small forward current and a large reverse current at a low operating voltage.
When the line power grid leaks electricity, the current flow direction in the device is as follows: the positive pole of the power grid 10 → the target 30 → the leakage detection resistor R → the reverse diode VT → the grounding control contactor KM4 → the negative pole of the power grid 10. It can be seen that after the leakage occurs, the leakage detection resistor R will be used as a load to continuously pass through the current, and since the power of the leakage detection resistor R is too small, when the time that the leakage detection resistor R passes through the current is too long, the leakage detection resistor R will be damaged. Because the carriages of the train on the line are all connected in parallel, and the leakage detection resistors R of all the carriages are used as loads, when leakage occurs, the leakage detection resistors R of all the carriages on the line can be damaged. When the line power grid leaks electricity, the controller 40 controls the grounding control contactor KM4 to be opened, so that the leakage detection resistor R is protected from being damaged.
Optionally, the protection device for the leakage detecting resistor may further include:
one end of the high-speed circuit breaker HSCB is connected with the positive electrode of the power grid 10;
one end of the positive contactor KM2 is connected with the other end of the high-speed breaker HSCB, and the other end of the positive contactor KM2 is connected with one end of the load set 31;
the other end of the load set 31 is connected with the negative electrode of the power grid 10;
the high-speed circuit breaker HSCB and the positive contactor KM2 are respectively connected with the controller 40, and the controller 40 controls the high-speed circuit breaker HSCB to be disconnected with or attracted to the positive contactor KM2 according to the first voltage value U of the leakage detection resistor R.
Specifically, the high-speed circuit breaker HSCB can complete the disconnection quickly in the rising phase of the short-circuit current, and the fault current does not continuously rise to reach the peak value.
The load set 31 is an electrical appliance set on the train, in this embodiment, the load set 31 may be an electrical appliance set using high voltage electricity in the train body, and all loads in the load set 31 are connected in parallel.
The positive contactor KM2 can adopt an alternating current contactor, and the circuit can be switched on or switched off by attracting and disconnecting the positive contactor KM 2. Since the voltage of the power grid 10 is high voltage, if the load set 31 is directly connected to the load set 31, a large current may momentarily pass through the load set 31, and the load set 31 may be burned out. Therefore, the protection device of the embodiment is provided with not only the high-speed circuit breaker HSCB but also the positive contactor KM2, so that the instantaneous large current on the load set 31 can be avoided, and the load set 31 is protected from being burned out.
Optionally, the protection device for the leakage detection resistor may further include: one end of the negative contactor KM3 is connected with the other end of the load set 31, and the other end of the negative contactor KM3 is connected with the negative electrode of the power grid 10; the negative contactor KM3 is connected with the controller 40, and the controller 40 controls the negative contactor KM3 to be disconnected or closed according to the first voltage value of the electric leakage detection resistor R.
Specifically, the negative contactor KM3 may be an ac contactor, and the connection or disconnection of the negative contactor KM3 may be performed. The negative contactor KM3 is used for connecting or disconnecting the negative pole of the power grid 10 to or from the load set 31.
When a leakage fault occurs in the line power grid, the controller 40 controls the high-speed circuit breaker HSCB and the positive contactor KM3 to be disconnected in the previous embodiment, that is, the path between the positive electrode of the power grid 10 and the load set 31 is disconnected, in order to be safer, in this embodiment, the protection device is further provided with the negative contactor KM3, when the leakage fault occurs in the line power grid, the controller 40 controls the negative contactor KM3 to be disconnected, the negative electrode of the power grid 10 and the load set are also disconnected, and it is ensured that no current passes through the load set 31.
In the embodiment of the application, when leakage detection resistance's protection device, including high-speed circuit breaker HSCB, positive contactor KM2, negative contactor KM3 and ground control contactor KM4, when the circuit electric network did not leak electricity, controller 40 controlled high-speed circuit breaker HSCB, positive contactor KM2, negative contactor KM3, the on-off condition of ground control contactor KM4 as follows:
(1) the high-voltage and low-voltage states of the train are not electrified:
the high-speed circuit breaker HSCB, the positive contactor KM2, the negative contactor KM3 and the grounding control contactor KM4 are all in an off state.
(2) The train is only powered on in a low-voltage state:
the high-speed circuit breaker HSCB, the positive contactor KM2 and the negative contactor KM3 are all in a disconnected state, and the grounding control contactor KM4 is in an actuation state.
(3) The train is only powered on in a high-voltage state:
the high-speed circuit breaker HSCB, the positive contactor KM2, the negative contactor KM3 and the grounding control contactor KM4 are all in a pull-in state.
The controller controls the high-speed circuit breaker HSCB, the positive contactor KM2, the negative contactor KM3 and the grounding control contactor KM4 to be disconnected or sucked according to the first voltage value U of the leakage detection resistor R, and can control the high-speed circuit breaker HSCB, the positive contactor KM2 and the grounding control contactor KM4 according to the power-on condition of a train, and the controller specifically comprises the following components:
when the train is powered on in a low-voltage state, when the controller 40 receives that the first voltage value U of the leakage detection resistor R is greater than or equal to aV, it is indicated that a line power grid has a leakage fault, the controller 40 is required to control the high-speed circuit breaker HSCB, the positive contactor KM2 and the negative contactor KM3 to maintain an off state, and the controller 40 controls the ground control contactor KM4 to be turned off. When U is less than aV, the line power grid is normal, the controller 40 controls the high-speed circuit breaker HSCB, the positive contactor KM2 and the negative contactor KM3 to maintain the disconnection state, and the controller 40 controls the grounding control contactor KM4 to maintain the pull-in state.
When the train is in a high-voltage power-on state, when the controller 40 receives that the first voltage value U of the leakage detection resistor R is greater than or equal to aV, it is indicated that a line power grid has a leakage fault, and the controller 40 is required to control the high-speed circuit breaker HSCB, the positive contactor KM2 and the negative contactor KM3 to be disconnected. After b seconds, the controller 40 receives the second voltage value U of the leakage detecting resistor R b And if the voltage is more than or equal to aV, the controller 40 controls the grounding control contactor KM4 to be disconnected. After b seconds, the controller 40 receives the second voltage value U of the leakage detecting resistor R b If the current is less than aV, the controller 40 controls the grounding control contactor KM4 to keep attracting.
The a is a fault voltage threshold, and the fault voltage threshold may be set according to experience or different scenarios. Illustratively, aV may be set to 100V, for example.
In the embodiment of the application, the grounding control contactor is controlled to be disconnected and sucked, so that the leakage detection resistor can be protected from being damaged, and the part of a circuit power grid with a leakage fault can be detected.
Optionally, one end of the ground control contactor connected to the negative electrode of the power grid is further connected to the other end of the negative electrode contactor. Namely, one end of the grounding control contactor KM4 is connected to the negative electrode of the power grid 10 and the other end of the negative electrode contactor KM3, respectively, and the other end of the grounding control contactor KM4 is connected to the leakage detection circuit 20. Specifically, the other end of the ground control contactor KM4 is connected to the negative electrode of the backward diode VT in the leakage detection circuit 20.
Or, refer to fig. 2, which shows a schematic structural diagram of a protection device of a leakage detection resistor according to another embodiment of the present application.
As shown in fig. 2, one end of the ground control contactor connected to the leakage detection circuit is also connected to the other end of the negative contactor. Namely, one end of the grounding control contactor KM4 is connected with the negative electrode of the power grid 10, and the other end of the grounding control contactor KM4 is connected with the other end of the leakage detection loop 20 and the other end of the negative electrode contactor KM3, respectively. Specifically, the grounding control contactor KM4 is connected to the negative electrode of the reverse diode VT in the leakage detection circuit 20.
It should be noted that, if the negative contactor is not provided in the protection device of the leakage detecting resistor, as shown in fig. 3, in a schematic structural diagram of the protection device of the leakage detecting resistor according to another embodiment of the present application, one end of the ground control contactor connected to the negative pole of the power grid is further connected to the other end of the load set. That is, one end of the ground control contactor KM4 is connected to the negative electrode of the power grid 10 and the other end of the load set 31, respectively, and the other end of the ground control contactor KM4 is connected to the negative electrode of the backward diode VT in the leakage detection circuit 20. Other components are connected in a manner corresponding to the embodiment shown in fig. 1.
Or, if the protection device of the leakage detecting resistor is not provided with the negative contactor, as shown in fig. 4, according to a schematic structural diagram of the protection device of the leakage detecting resistor provided in another embodiment of the present application, one end of the ground control contactor connected to the leakage detecting circuit is further connected to the other end of the load set. Namely, one end of the grounding control contactor KM4 is connected to the negative electrode of the power grid 10, and the other end of the grounding control contactor KM4 is connected to the reverse diode VT in the leakage detection circuit 20 and the other end of the load set 31, respectively. Other components are connected in a manner corresponding to the embodiment shown in fig. 2.
Referring to fig. 5, a schematic flow chart of a protection method of a leakage detection resistor according to an embodiment of the present application is shown. The protection method of the leakage detection resistor can be implemented by using the protection device of the leakage detection resistor.
As shown in fig. 5, a method for protecting a leakage detection resistor may include:
in step 520, when the first voltage value of the leakage detection resistor R is greater than or equal to the voltage threshold a, the grounding control contactor KM4 is controlled to be turned off.
Specifically, the first voltage value of the leakage detecting resistor R is obtained by the voltage sensor VH and then transmitted to the controller 40. Where a is a fault voltage threshold, which may be set according to experience or different scenarios. Illustratively, aV may be set to 100V, for example.
Optionally, when an electric leakage fault is detected, the controller 40 controls the ground control contactor KM4 to be disconnected to protect the electric leakage detection resistor R, and meanwhile, the controller 40 may also continuously perform electric leakage alarm to draw attention of the worker, and of course, may also send alarm information to the worker, and the like, which is not limited herein.
Optionally, before step 110, the protection method may further include:
determining that the target 30 is in a low pressure state;
and controlling the grounding to control the attraction of the contactor KM 4.
Specifically, when the target 30 is in a low-voltage state, the states of each contactor and breaker are: the high-speed circuit breaker HSCB, the positive contactor KM2 and the negative contactor KM3 are all in an off state, and the grounding control contactor KM4 is in an attraction state. Therefore, when the controller 40 obtains that the target body 30 is in a low-pressure state, the controller 40 controls the grounding control contactor KM4 to be closed.
Optionally, before step 110, the protection method may further include:
determining that the target 30 is in a high pressure state;
the control grounding control contactor KM4, the high-speed circuit breaker HSCB, the positive contactor KM2 and the negative contactor KM3 are all sucked;
when the first voltage value U of the leakage detection resistor R is greater than or equal to the voltage threshold value a, the ground control contactor KM4 is controlled to be turned off, including:
when the first voltage value U of the leakage detection resistor R is greater than or equal to the voltage threshold value a, the high-speed circuit breaker HSCB, the positive contactor KM2 and the negative contactor KM3 are controlled to be switched off;
after the preset time, acquiring a second voltage value U of the leakage detection resistor R b ；
When the second voltage value U of the leakage detection resistor b And when the voltage is greater than or equal to the voltage threshold value a, the grounding control contactor KM4 is controlled to be disconnected.
Specifically, when the target 30 is in a high-voltage state, the states of each contactor and each circuit breaker are respectively: the high-speed circuit breaker HSCB, the positive contactor KM2, the negative contactor KM3 and the grounding control contactor KM4 are all in a suction state. Therefore, when the controller 40 obtains that the target 30 is in a high-voltage state, the controller 40 controls the high-speed circuit breaker HSCB, the positive contactor KM2, the negative contactor KM3 and the ground control contactor KM4 to be attracted.
When the target body 30 is in a high-voltage state, when the controller 40 receives that the first voltage value U of the leakage detection resistor R is not less than aV, it is indicated that a leakage fault occurs in the line power grid, the controller 40 can continuously perform leakage alarm to attract the attention of workers, and can also give alarm information prompt to the workers, and the like, and meanwhile, the controller 40 controls the high-speed circuit breaker HSCB, the positive contactor KM2, and the negative contactor KM3 to be turned off.
In order to determine the location information of the line grid leakage, after a preset time of b seconds, the controller 40 obtains a second voltage value U of the leakage detection resistor R b When U is present b When aV is equal to or greater than aV, it indicates that an electric leakage fault occurs in the target body 30, and the controller 40 controls the grounding control contactor KM4 to be turned off, thereby protecting the electric leakage detection resistor R from being burned out. It should be noted that, when the target 30 has an electric leakage fault, the controller 40 may continuously perform an electric leakage alarm to attract the attention of the staff, and may also send an alarm message prompt to the staff, which is not limited herein. Wherein the preset time can be determined according toDifferent line grids of the same product are set, because the off-time of the high-speed circuit breaker HSCB does not exceed 400ms generally, enough off-time is reserved for the high-speed circuit breaker HSCB, so that if the target 30 does not leak electricity, the voltage value at the two ends of the leakage detection resistor R can have time to drop, illustratively, the preset time can be set to 600ms, and it should be noted that when the negative contactor is not arranged in the protection device of the leakage detection resistor, the preset time also needs to be reset.
Note that if b seconds later, U b If aV is less than aV, the controller 40 cancels the leakage alarm.
After the preset time, the voltage value and the voltage threshold value of the electric leakage detection resistor are judged again, so that the position of the electric leakage fault can be identified.
Referring to fig. 6, a schematic flow chart of a protection method for a leakage detection resistor according to another embodiment of the present application is shown.
As shown in fig. 6, a method for protecting a leakage detection resistor may include:
690, the controller continuously performs electric leakage alarm and controls the grounding control contactor KM4 to be disconnected, and then the operation is finished;
Fig. 7 is a schematic structural diagram of a protection device of a leakage detection resistor according to an embodiment of the present invention. As shown in fig. 7, a schematic structural diagram of a protective apparatus 700 suitable for implementing embodiments of the present application is shown.
As shown in fig. 7, the protection apparatus 700 includes a Central Processing Unit (CPU) 701 that can perform various appropriate actions and processes according to a program stored in a Read Only Memory (ROM) 702 or a program loaded from a storage section 708 into a Random Access Memory (RAM) 703. In the RAM 703, various programs and data necessary for the operation of the apparatus 700 are also stored. The CPU 701, ROM 702, and RAM 703 are connected to each other via a bus 704. An input/output (I/O) interface 706 is also connected to bus 704.
The following components are connected to the I/O interface 705: an input portion 706 including a keyboard, a mouse, and the like; an output section 707 including a display such as a Cathode Ray Tube (CRT), a Liquid Crystal Display (LCD), and the like, and a speaker; a storage section 708 including a hard disk and the like; and a communication section 709 including a network interface card such as a LAN card, a modem, or the like. The communication section 709 performs communication processing via a network such as the internet. A drive 710 is also connected to the I/O interface 706 as needed. A removable medium 711 such as a magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, or the like is mounted on the drive 710 as necessary, so that the computer program read out therefrom is mounted in the storage section 708 as necessary.
In particular, the process described above with reference to fig. 5 may be implemented as a computer software program, according to an embodiment of the present disclosure. For example, embodiments of the present disclosure include a computer program product comprising a computer program tangibly embodied on a machine-readable medium, the computer program comprising program code for performing the above-described method of protection of a leakage detection resistor. In such an embodiment, the computer program can be downloaded and installed from a network through the communication section 709, and/or installed from the removable medium 711.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The units or modules described in the embodiments of the present application may be implemented by software or hardware. The described units or modules may also be provided in a processor. The names of these units or modules do not in some cases constitute a limitation of the unit or module itself.
As another aspect, the present application also provides a storage medium, which may be the storage medium contained in the foregoing device in the above embodiment; or may be a storage medium that exists separately and is not assembled into the device. The storage medium stores one or more programs that are used by one or more processors to implement the protection method for the electrical leakage detection resistor described in the present application.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements in which any combination of the above features or their equivalents is incorporated without departing from the spirit of the invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (11)
1. A protection device for a leakage detecting resistor, comprising:
one end of the grounding control contactor is connected with the negative pole of the power grid;
the leakage detection circuit is respectively connected with the other end of the grounding control contactor and the target body; the leakage detection circuit comprises a leakage detection resistor and a backward diode, the negative electrode of the backward diode is connected with the other end of the grounding control contactor, the positive electrode of the backward diode is connected with one end of the leakage detection resistor, and the other end of the leakage detection resistor is connected with the target body;
the controller is respectively connected with the grounding control contactor and the electric leakage detection loop, and controls the grounding control contactor to be disconnected or closed according to the first voltage value of the electric leakage detection resistor;
the controller is specifically used for determining whether a first voltage value of the electric leakage detection resistor is smaller than a fault voltage threshold value or not in a low-voltage power-on mode, and controlling the grounding control contactor to pull in if the first voltage value of the electric leakage detection resistor is smaller than the fault voltage threshold value; if not, controlling the grounding control contactor to be disconnected;
or, in a high-voltage power-on mode, determining whether the first voltage value of the leakage detection resistor is smaller than the fault voltage threshold value, if so, controlling the grounding control contactor to pull in; if not, after waiting for a preset time, determining whether a second voltage value of the leakage detection resistor is smaller than the fault voltage threshold value; if yes, controlling the grounding control contactor to pull in; if not, the grounding control contactor is controlled to be disconnected.
2. The protection device of leakage detection resistor as claimed in claim 1, wherein said leakage detection loop further comprises:
the voltage sensor is connected with the electric leakage detection resistor in parallel, the voltage sensor is connected with the controller, and the controller acquires the voltage value of the electric leakage detection resistor through the voltage sensor.
3. The protection device for a ground leakage detection resistor according to any one of claims 1-2, further comprising:
one end of the high-speed circuit breaker is connected with the positive pole of the power grid;
one end of the positive contactor is connected with the other end of the high-speed circuit breaker, and the other end of the positive contactor is connected with one end of a load set;
the other end of the load set is connected with the negative electrode of the power grid;
the high-speed circuit breaker and the positive contactor are respectively connected with the controller, and the controller controls the high-speed circuit breaker and the positive contactor to be disconnected or attracted according to the first voltage value of the electric leakage detection resistor.
4. The protection device of a leakage detection resistor as claimed in claim 3, wherein the end of the ground control contactor connected to the negative pole of the power grid is further connected to the other end of the load set;
or the like, or a combination thereof,
and one end of the grounding control contactor, which is connected with the electric leakage detection loop, is also connected with the other end of the load set.
5. A protection device for a leakage detecting resistor according to any one of claims 1-2, wherein the protection device further comprises:
one end of the negative contactor is connected with the other end of the load set, and the other end of the negative contactor is connected with the negative electrode of the power grid;
the negative contactor is connected with the controller, and the controller controls the negative contactor to be disconnected or attracted according to the first voltage value of the electric leakage detection resistor.
6. A protection device for a leakage detecting resistor according to claim 5, wherein one end of the grounding control contactor connected to the negative electrode of the power grid is further connected to the other end of the negative electrode contactor;
or the like, or, alternatively,
and one end of the grounding control contactor, which is connected with the electric leakage detection loop, is also connected with the other end of the negative contactor.
7. A protection method of a leakage detection resistor, applied to the protection device of a leakage detection resistor according to claim 1, wherein the protection device of a leakage detection resistor comprises a ground control contactor and a leakage detection loop, and the leakage detection loop comprises a leakage detection resistor and a reverse diode, and the method comprises:
acquiring a first voltage value of a leakage detection resistor of the leakage detection loop;
in a low-voltage power-on mode, determining whether the first voltage value is smaller than a fault voltage threshold value, and if so, controlling the grounding control contactor to pull in; if not, the reverse diode is not conducted, and the grounding control contactor is controlled to be disconnected;
in a high-voltage power-on mode, determining whether the first voltage value is smaller than the fault voltage threshold value, if so, controlling the grounding control contactor to pull in; if not, after waiting for a preset time, determining whether a second voltage value of the leakage detection resistor is smaller than the fault voltage threshold value; if yes, controlling the grounding control contactor to pull in; if not, the reverse diode is not conducted, and the grounding control contactor is controlled to be disconnected.
8. The method according to claim 7, further comprising, before obtaining the first voltage value of the leakage detecting resistor of the leakage detecting circuit:
determining that the target body is in a low-pressure state;
and controlling the grounding control contactor to suck.
9. The method according to claim 7, wherein before obtaining the first voltage value of the leakage detecting resistor of the leakage detecting circuit, the method further comprises:
determining that the target body is in a high-pressure state;
and controlling the ground control contactor, the high-speed circuit breaker, the anode contactor and the cathode contactor to be attracted.
10. The method for protecting a leakage detection resistor according to claim 7, wherein before controlling the ground control contactor to open when it is determined that the first voltage value is equal to or greater than the fault voltage threshold in the high-voltage power-up mode, the method further comprises:
and when the first voltage value is larger than or equal to the fault voltage threshold value, the high-speed circuit breaker, the positive contactor and the negative contactor are controlled to be disconnected.
11. A protection device for a leakage detection resistor, the device comprising a memory, a processor and a program stored on the memory and executable on the processor, the processor implementing the method as claimed in any one of claims 7 to 10 when executing the program.
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| CN202010373003.5A CN113625021B (en) | 2020-05-06 | 2020-05-06 | Protection device, method and equipment for electric leakage detection resistor |
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| CN202010373003.5A CN113625021B (en) | 2020-05-06 | 2020-05-06 | Protection device, method and equipment for electric leakage detection resistor |
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| CN114563733A (en) * | 2022-03-01 | 2022-05-31 | 中车青岛四方机车车辆股份有限公司 | Alternating current leakage detection system and method supporting power supply mode conversion and vehicle |
| CN114779118B (en) * | 2022-04-20 | 2024-10-11 | 中国第一汽车股份有限公司 | Leakage detection device, leakage detection method and automobile charging equipment |
| EP4310519A1 (en) * | 2022-07-22 | 2024-01-24 | Aptiv Technologies Limited | Vehicle ground connection diagnostic apparatus, method, and software |
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