CN110460023B - Switch control method of drainage device - Google Patents
Switch control method of drainage device Download PDFInfo
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- CN110460023B CN110460023B CN201910743753.4A CN201910743753A CN110460023B CN 110460023 B CN110460023 B CN 110460023B CN 201910743753 A CN201910743753 A CN 201910743753A CN 110460023 B CN110460023 B CN 110460023B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
Abstract
The invention discloses a switch control method of a drainage device, wherein the drainage device comprises a primary drainage channel and a secondary drainage channel; the switch of the main leakage channel comprises a main mechanical switch and a first solid-state switch; the switch of the secondary leakage channel comprises a secondary mechanical switch and a second solid-state switch; the method comprises the following steps: determining whether the drain device is over-current at the time of draining; when the fault branch is not established, monitoring whether the fault state of the fault branch is relieved; if so, after sending a breaking signal and a conducting signal to the corresponding secondary mechanical switch and the second solid-state switch in each secondary drainage channel, controlling the second solid-state switch in the channel to be switched on and off until the switches in all the secondary drainage channels are switched on and off, controlling the primary mechanical switch to be switched on and off, controlling the first solid-state switch to be switched on and then controlling the first solid-state switch to be switched on and off. When the switch of the secondary main drainage channel is disconnected successively, the switch is controlled by using different control strategies, so that the electric arc generated by a mechanical switch is avoided, and the quick cutting of the drainage device is facilitated.
Description
Technical Field
The invention relates to the field of circuit electronics, in particular to a switch control method of a drainage device.
Background
With the continuous enlargement of the scale of a power grid, the continuous increase of the interconnection degree and the continuous operation of a large-capacity unit, the short-circuit fault current in a modern power system is continuously increased. In order to reduce the harm caused by short-circuit fault current, the traditional method mainly depends on the additional installation of a fault current limiter to limit and restrict the short-circuit current, but because the additional installation of the fault current limiter adopts a series connection mode, the energy loss of a power transmission line is actually greatly increased. Therefore, although the current fault current limiter reduces the harm caused by short-circuit fault current, other problems actually exist to influence the energy consumption and economic operation of the power system.
This is achieved by a bleeder device connected in parallel to the grid, see fig. 1, which uses a topology with a mechanical switch connected in series with a resistor, whereby the fault current is controlled to flow through the resistor to ground until the circuit breaker breaks the fault line. On the other hand, although the leakage device adopts a parallel connection mode, the problem of large loss is avoided, the addition of the mechanical switch also brings about an arc problem correspondingly, and the quick cutting of the leakage device is not facilitated.
Disclosure of Invention
The invention mainly aims to provide a switch control method of a flow discharge device, and aims to solve the technical problem that the quick cutting of a flow discharge device is not facilitated due to electric arc caused by the addition of a mechanical switch when the flow discharge device is used for discharging.
In order to achieve the purpose, the invention provides a switch control method of a drainage device, wherein the drainage device comprises a main drainage channel and a plurality of secondary drainage channels; the switch in the main leakage channel comprises a main mechanical switch, a first solid-state switch and a pulse discharge circuit, wherein the first solid-state switch and the pulse discharge circuit are respectively connected with the main mechanical switch in parallel; the switch in each secondary leakage channel comprises a secondary mechanical switch and a second solid-state switch correspondingly connected with the secondary mechanical switch in parallel; the method comprises the following steps:
when the drainage device is used for drainage, a first judgment for determining whether a branch in which the drainage device is located has overcurrent is carried out;
when the first judgment is not satisfied, monitoring whether the fault state of the corresponding fault branch is released or not;
if yes, after a breaking signal and a conducting signal are sent to the secondary mechanical switch and the second solid-state switch which respectively correspond to each secondary drainage channel, the second solid-state switch in the corresponding secondary drainage channel is controlled to be switched on and off, and when the switches in all the secondary drainage channels are switched on and off, the breaking signal is sent to the main mechanical switch to control the main mechanical switch to be switched on and off, the conducting signal is sent to control the first solid-state switch to be switched on, and then the first solid-state switch in the main drainage channel is controlled to be switched on and off.
Optionally, a protection device for transferring an overcurrent is further connected in parallel to the secondary leakage channels;
after the step of performing the first determination of whether the branch in which the bleeding device is located has an overcurrent, the method further includes:
and when the first judgment is in effect, starting the protection device.
Optionally, after the step of activating the protection device, the method further includes:
monitoring whether the fault state of the corresponding fault branch is released;
if yes, controlling all the conducted secondary mechanical switches to be switched on and off when the drainage device drains the current;
if not, returning to continuously monitor whether the fault state is relieved.
Optionally, after the step of controlling the opening of all the turned-on secondary mechanical switches when the draining device drains, the method further includes:
sending a control signal to control the protection device to be closed;
collecting the current of a branch where a current leakage device is located to execute second judgment for determining whether the branch where the current leakage device is located has overcurrent;
when the second judgment is established, the pulse discharge circuit is controlled to be conducted before the main mechanical switch is switched on, so that an artificial current zero crossing point is formed when the contacts of the main mechanical switch are separated.
Optionally, after the step of performing the second determination of whether the branch in which the draining device is located has an overcurrent, the method further includes:
and when the second judgment is not satisfied, sending a breaking signal to the main mechanical switch to control the main mechanical switch to be switched on and off, sending a conducting signal to control the first solid-state switch to be switched on, and then controlling the first solid-state switch to be switched on and off.
Optionally, the protection device is an MOV arrester or a discharge gap.
Optionally, the step of monitoring whether the fault state of the corresponding faulty branch is resolved includes:
and monitoring whether the breaker on the fault branch successfully cuts off the fault and whether the breaker is successfully reclosed, wherein when the breaker successfully cuts off the fault or the breaker is successfully reclosed, the fault state of the fault branch is removed.
Optionally, after sending the breaking signal and the conducting signal to the secondary mechanical switch and the second solid-state switch respectively corresponding to each secondary leakage path, the step of controlling the second solid-state switch in the corresponding secondary leakage path to be turned on and off until the switches in all the secondary leakage paths are turned on and off includes:
sequentially selecting secondary drainage channels according to a preset sequence;
when the secondary drainage channel is selected, sending a breaking signal to a secondary mechanical switch in the secondary drainage channel and sending a conducting signal to a second solid-state switch in the secondary drainage channel;
controlling the second solid-state switch in the secondary drainage channel to be switched on and off, and judging whether the quantity of the cumulatively selected secondary drainage channels reaches the total quantity of the secondary drainage channels required to be conducted;
if yes, stopping selecting the secondary discharge channel;
if not, returning to continue selecting the next drainage channel.
The scheme can realize the following beneficial effects:
1. compared with the traditional fault leakage device, the mechanical switch is disconnected by using different switch control strategies through the difference between the current state of the leakage branch and the fault state of the fault branch, so that the generation of electric arcs by the mechanical switch is avoided, the quick removal of the leakage device and the safe and stable operation of a power grid system are facilitated, and the artificial fault point is prevented from becoming a real fault point after the fault removal.
2. Compared with the traditional fault current limiter, the fault current limiter has no influence on a normally-operated power grid system, can divide large fault current into a plurality of fault currents which can be cut off by the circuit breakers during fault, and achieves quick fault line cutting off.
Drawings
FIG. 1 is a schematic diagram of a prior art bleed apparatus in the event of a short circuit fault;
FIG. 2 is a schematic diagram of a circuit structure of a bleeding control circuit when the switch control method of the bleeding device is applied to the bleeding control circuit;
FIG. 3 is a schematic diagram of the structure of the switch in the main bleed passage of FIG. 2;
FIG. 4 is a schematic diagram of the structure of the switch in the secondary bleed path of FIG. 2;
fig. 5 is a flow chart illustrating a method for controlling the opening and closing of the bleeding device according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a switch control method of a drainage device, which is applied to a drainage control circuit. Referring to fig. 2, a leakage current apparatus 10 in a leakage current control circuit includes a main leakage current path 11 (or referred to as a main leakage current apparatus) and a secondary leakage current path 12 (or referred to as a secondary leakage current apparatus), a switch S1 of the main leakage current path 11 may be referred to as a main leakage current switch, and switches S1 to Sn of the secondary leakage current path 12 may be referred to as secondary leakage current switches, wherein the main leakage current switch is connected in series with a main resistor R1, one end of the main leakage current path 11 close to the main leakage current switch is connected to a bus, and one end of the main leakage current path 11 close to a main resistor R1 is grounded. The secondary leakage path 12 is also a structure with a switch and a resistor connected in series, one end of the secondary leakage path 12 is connected with a junction of the main resistor R1 and the main leakage switch, and the other end of the secondary leakage path 12 is grounded. When the power grid fails, the current leakage device 10 can shunt large fault current and decompose large current exceeding the opening range of the circuit breaker into a plurality of small fault currents, so that the short-circuit current of the original short-circuit point branch circuit is greatly reduced, and the circuit breaker can safely and efficiently cut off a fault circuit. It will be appreciated that the main bleed switch determines whether the bleed device 10 is connected to the grid system, and that the switching of the secondary bleed path 12 determines the amount of resolved fault current. When the power grid system is normal, the total current leakage switch is switched off, no current flows through the branch of the current leakage device 10, and no adverse effect is caused on the power grid; on the contrary, when the power grid system has a short-circuit fault, the main bleeder switch can be closed firstly, then the secondary bleeder switches are closed step by step, and when one bleeder switch is closed, namely one bleeder resistor is put in, part of fault current flows into the ground through the bleeder resistor, so that the current on the fault line is reduced until the current of the fault line is smaller than the rated breaking current of the breaker, and the breaker cuts off the fault line. Compared with the traditional fault current limiter, the fault current limiter has no influence on a normally-operated power grid system, can divide large fault current into a plurality of fault currents which can be cut off by the circuit breakers during fault, and achieves quick fault line cutting off.
Referring to fig. 2-4, the switch in the drain 10 is also shown in detail. The main leakage switch in the main leakage path 11 is formed by connecting a main mechanical switch S11, a pulse discharge circuit S13 and a first solid-state switch S12 in parallel, the main mechanical switch S11 is used for conducting the leakage circuit for a long time, the first solid-state switch S12 is used for avoiding the arc problem that the main mechanical switch S11 is turned on and off when the current is relatively small, and the pulse discharge circuit S13 is used for avoiding the arc problem that the main mechanical switch S11 is turned on and off when the current is over-current. The secondary bleed switch in the secondary bleed path 12 may be formed by connecting the secondary mechanical switch S14 in parallel with the corresponding second solid-state switch S15, since the current flowing through the single secondary bleed path 12 is relatively small.
Referring back to fig. 2, a control module 40, a leakage state identification module 30 and a fault identification module 20 are also provided in the leakage control circuit. The current leakage state identifying module 30 is connected to the second current transformer CT2 connected in series to the branch of the current leakage device 10, and may receive the current of the branch of the current leakage device 10 collected by the second current transformer CT2, determine whether the branch of the current leakage device 10 is over-current according to the collected current, and then send the determination result, that is, no over-current or over-current, to the connected control module 40 by the current leakage state identifying module 30. Similarly, the fault identification module 20 is also connected to the first current transformer CT1 connected in series on the fault branch in the bus branch, and is configured to receive the current signal of the fault branch collected by the first current transformer CT1, so as to determine a fault identification result according to the magnitude of the current on the fault branch, where the fault identification result may include that the fault has been removed and the fault has not been removed, and the fault identification module 20 sends the identification result to the connected control module 40. It should be further noted that the fault identification module 20 may determine whether the fault is successfully removed through the current to correspondingly determine a fault identification result, and if the fault is successfully removed, determine whether the fault is recovered to normal, and the fault is successfully reclosed, or connect with the circuit breaker, so as to know the condition of the circuit breaker in time. Taking the reclosing success as an example, when the reclosing succeeds, it can be determined that the fault is removed. The reclosing means that the breaker is closed in a short time after the line fault is cleared, and self-recovery power supply is achieved. The control module 40 serves as a central hub, and can receive the fault condition of the fault branch, and also can know whether the branch in which the leakage device 10 is located has an overcurrent in time, so as to flexibly control the on/off of the leakage device 10 according to different states. Therefore, the provided fault identification module 20, the leakage state identification module 30 and the control module 40 can adapt to the requirement of rapid removal of the leakage device 10 under various conditions, and are beneficial to the safe and stable operation of the power grid system.
Further, a protection device 50 may be further disposed in the leakage flow control circuit, the protection device 50 is connected in parallel with the secondary leakage flow channel 12, and the opening and closing of the protection device 50 is controlled by the control module 40. The protection device 50 is a component capable of transferring an over-current on the current discharging device 10, such as a Metal Oxide Varistor (MOV) or a discharge gap. Based on the function of the protection device 50, the protection device 50 may send a control signal to control the protection device 50 to start when the control module 40 determines that the branch of the leakage device 10 is over-current, and stop when the branch is not over-current. Through the arrangement of the protection device 50, the leakage device 10 can be protected from the overcurrent impact, and according to the scheme, the overcurrent of the leakage branch caused by the parallel connection of the secondary leakage channels 12 is mainly prevented.
Referring to fig. 5, based on the above hardware structure, the proposed switch control method of the bleeding device may include the following steps:
step S10, when the current leakage device is used for current leakage, a first judgment of determining whether the branch where the current leakage device is located has overcurrent is carried out; if not, go to step S20; if yes, go to step S50;
step S20, monitoring whether the fault state of the corresponding fault branch is released; if yes, go to step S30; if not, returning to continue the step S20;
step S30, after sending breaking signals and conducting signals to the secondary mechanical switches and the second solid-state switches respectively corresponding to each secondary drainage channel, controlling the second solid-state switches in the corresponding secondary drainage channels to be switched on and off, and sending breaking signals to the main mechanical switch to control the main mechanical switch to be switched on and off and sending conducting signals to control the first solid-state switches to be switched on sequentially until the switches in all the secondary drainage channels are switched on and off;
step S40, controlling the first solid-state switch in the main drainage channel to be switched on and off;
step S50, starting the protection device and monitoring whether the fault state of the corresponding fault branch is released; if yes, go to step S60; if not, returning to continue the step S50;
step S60, controlling all the conducted secondary mechanical switches to be switched off when the drainage device drains;
step S63, sending out a control signal to control the protection device to close;
step S65, collecting the current of the branch where the current leakage device is located to execute a second judgment for determining whether the branch where the current leakage device is located has overcurrent; if yes, go to step S70; if not, go to step S80;
step S70, controlling a pulse discharge circuit to be conducted before the main mechanical switch is switched on and switched off so as to form an artificial current zero crossing point when the contacts of the main mechanical switch are separated;
and step S80, sending a breaking signal to the main mechanical switch to control the main mechanical switch to be switched on and off, sending a conducting signal to control the first solid-state switch to be switched on, and then controlling the first solid-state switch to be switched on and off.
The process and technical principle of the switch flexible strategy control of the leakage device will be further described below by combining the control module, the fault identification module and the leakage state identification module. It is understood that the control module, the fault identification module and the leakage state identification module may be separately provided, or the fault identification module and the leakage state identification module may be integrated into the control module.
The fault identification module collects a current signal of a fault branch to identify the fault state of the fault branch, namely, whether the fault of the fault branch is relieved or not is determined; the current leakage state identification module collects a current signal of a branch circuit where the current leakage device is located to judge whether the branch circuit where the current leakage device is located has overcurrent. The control module receives the identification result of the fault state sent by the fault identification module and the judgment result sent by the leakage state identification module. When the identification result is that the fault branch is not removed, namely the fault branch is in a fault state, the leakage current device works normally, the main mechanical switch or the main mechanical switch and a plurality of secondary mechanical switches can be selectively switched on according to the magnitude of fault current, the leakage current of the main leakage current channel flows through the main mechanical switch, and the pulse discharge circuit and the first solid-state switch are both in an on-off state; if a certain secondary leakage channel is conducted, secondary leakage current of the secondary leakage channel flows through the secondary mechanical switch and is in an on-off state corresponding to the second solid-state switch; if a certain secondary drainage channel is not conducted, the corresponding switch structures are all switched off.
On the basis, if the operation of the leakage flow device is normal and no overcurrent occurs in the branch where the leakage flow device is located, the control module receives the recognition result and converts the recognition result into the recognition result that the recognition result is removed, namely the fault is successfully cut off or the breaker is automatically reclosed, and after sending a breaking signal and a conducting signal to the secondary mechanical switch and the second solid-state switch which respectively correspond to each secondary leakage flow channel, the control module controls the second solid-state switch in the corresponding secondary leakage flow channel to be switched on and off until the switches in all the secondary leakage flow channels are switched on and off.
The specific implementation steps of the control module can be that secondary drainage channels are sequentially selected according to a preset sequence; when the secondary drainage channel is selected, sending a breaking signal to a secondary mechanical switch in the secondary drainage channel and sending a conducting signal to a second solid-state switch in the secondary drainage channel; controlling the second solid-state switch in the secondary drainage channel to be switched on and off, and judging whether the quantity of the cumulatively selected secondary drainage channels reaches the total quantity of the secondary drainage channels required to be conducted; when the number of the selected secondary drainage channels is accumulated to reach the total amount of the secondary drainage channels required to be conducted, the selection of the secondary drainage channels is stopped; and when the number of the cumulatively selected secondary drainage channels does not reach the total amount of the secondary drainage channels required to be conducted, continuously selecting the next secondary drainage channel. It should be noted that the selection of the preset sequence is set according to the actual needs of the control module, as long as the sequential disconnection of the secondary drainage channels is realized. The total amount of conduction required by the secondary drainage channels refers to the number of the secondary drainage channels required to be conducted to meet the drainage requirement. In addition, in this embodiment, the second solid-state switch in the secondary leakage path is controlled to be turned off, that is, after the secondary mechanical switch is turned off and the second solid-state switch is turned on, the second solid-state switch on the secondary leakage path is controlled to be turned off again. The second solid-state switches and the corresponding secondary mechanical switches are switched off one by one in a switching-off mode, so that electric arcs when the secondary mechanical switches are switched off are avoided, electric arc currents on the secondary mechanical switches are quickly converted to the corresponding branches where the second solid-state switches are located, and the second solid-state switches are used for quickly breaking the currents.
After the switches in the secondary leakage channel are all switched off, the switches of the main leakage channel need to be switched off, the control module can sequentially send out a breaking signal to the main mechanical switch to control the main mechanical switch to be switched on and switched off and send out a conducting signal to control the first solid-state switch to be switched on, so that the arc current on the main mechanical switch in the main leakage channel is quickly converted to a branch where the first solid-state switch is located, the first solid-state switch is used for quickly breaking the current, and the first solid-state switch can be switched on and switched off after the switching is completed, that is, all the switches on the main leakage channel are switched off. Through the arrangement, electric arcs of a main mechanical switch are avoided, and the quick cutting of the main leakage switch is facilitated.
On the other hand, when the leakage device operates normally and the branch circuit where the leakage device is located has overcurrent, the control module can send out a control signal to start the protection device. When the protection device is started, the current on the secondary leakage channel is completely transferred to the protection circuit, no current flows through the switch on the secondary leakage channel, and the overcurrent still flows through the switch on the main leakage channel. When the quick cutting-off of the drainage device is carried out, all mechanical switches on the secondary drainage channel can be directly switched off firstly, at the moment, the control module sends out a switching-off signal to control all secondary mechanical switches in a conducting state to be directly switched on and off without the participation of the corresponding second solid-state switches. After the secondary mechanical switch is completely switched off, the secondary leakage resistor connected with the main leakage resistor in parallel exits, only the main leakage resistor remains in the resistor connected to the power system on the leakage channel, namely the resistor is increased, and at the moment, the current flowing through the leakage channel is greatly reduced under the action of exiting the protection device. After the protection device is withdrawn from the action, the secondary judgment is carried out, if the overcurrent still exists, the main leakage channel is immediately switched on and off by adopting a switching-on and switching-off mode of the pulse discharge circuit matched with the main mechanical switch, namely the pulse discharge circuit is controlled to be switched on before the main mechanical switch is switched on and switched off, so that the artificial current zero crossing point is formed when the contacts of the main mechanical switch are separated. The control module can firstly send a breaking signal to the main mechanical switch, and then send a conducting signal to the pulse discharge circuit before the contact of the main mechanical switch begins to be separated, and the conducting sequence can be simultaneous or sequential, or the time sequence is set according to actual needs, but the pulse discharge circuit needs to be ensured to be conducted before the main mechanical switch is disconnected, so that the artificial current zero crossing point is formed when the contact of the main mechanical switch is separated. Through the moment that control pulse discharge begins for form artificial current zero crossing point on the main machinery switch and the moment of main machinery switch contact separation just coincide, open the contact of machinery switch promptly when zero current, reach the purpose that improves the electric arc problem that the switch cut off and appear, set up the electric arc problem of main machinery switch cut off when having avoided the overcurrent through the cooperation of pulse discharge circuit. Furthermore, after the main mechanical switch is turned on and off and the arc current on the main mechanical switch is transferred to the branch path where the first solid-state switch is located, the first solid-state switch can be turned off, and the main leakage channel switch is turned on and off completely.
It should be further noted that, when the bleeding device operates normally, the branch in which the bleeding device is located has an overcurrent, and after the situation that the overcurrent possibly exists in the secondary bleeding channel is removed, the fact that the overcurrent does not exist in the bleeding branch, that is, the overcurrent does not exist in the primary bleeding channel, may refer to the scheme that the control module sequentially sends out the breaking signal to the primary mechanical switch to control the on-off of the primary mechanical switch and sends out the conducting signal to control the conduction of the first solid-state switch to perform the switching control, which is not described herein again.
According to the scheme, after the flow discharger normally operates, when overcurrent occurs on the corresponding flow discharge channel of the flow discharger and the normal closing of the flow discharger is relieved due to fault after the normal operation, the secondary mechanical switch in the secondary flow discharge channel and the main mechanical switch in the main flow discharge channel are closed successively through different control strategies of the control module, so that electric arcs are avoided, the quick cutting of the flow discharger is realized, and artificial fault points are prevented from becoming real fault points after the fault is cut. Compared with the prior art, the problem of efficiently and safely cutting off the branch of the drainage device is solved, and the safe and stable operation of the power system is ensured.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or server that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or server. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or service that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. The switch control method of the drain device is characterized in that the drain device comprises a main drain channel and a plurality of secondary drain channels; the switch in the main leakage channel comprises a main mechanical switch, a first solid-state switch and a pulse discharge circuit, wherein the first solid-state switch and the pulse discharge circuit are respectively connected with the main mechanical switch in parallel; the switch in each secondary leakage channel comprises a secondary mechanical switch and a second solid-state switch correspondingly connected with the secondary mechanical switch in parallel; the method comprises the following steps:
when the drainage device is used for drainage, a first judgment for determining whether a branch in which the drainage device is located has overcurrent is carried out;
when the first judgment is not satisfied, monitoring whether the fault state of the corresponding fault branch is released or not;
if so, after sending a breaking signal to the secondary mechanical switches respectively corresponding to each secondary drainage channel and sending a conducting signal to the second solid-state switches respectively corresponding to each secondary drainage channel, controlling the second solid-state switches in the corresponding secondary drainage channels to be switched on and off until the switches in all the secondary drainage channels are switched on and off, sequentially sending the breaking signal to the main mechanical switch to control the main mechanical switch to be switched on and off and sending a conducting signal to control the first solid-state switch to be switched on and then controlling the first solid-state switch in the main drainage channel to be switched on and off.
2. The switching control method of the leakage current device according to claim 1, wherein a protection device for transferring the over-current is connected in parallel to the plurality of secondary leakage current paths;
after the step of performing the first determination of whether the branch in which the bleeding device is located has an overcurrent, the method further includes:
and when the first judgment is in effect, starting the protection device.
3. The method of claim 2, wherein the step of activating the protection device is further followed by the steps of:
monitoring whether the fault state of the corresponding fault branch is released;
if yes, controlling all the conducted secondary mechanical switches to be switched on and off when the drainage device drains the current;
if not, returning to continuously monitor whether the fault state is relieved.
4. The method for controlling the opening and closing of the bleed apparatus according to claim 3, wherein the step of controlling the opening and closing of all the secondary mechanical switches that are turned on when the bleed apparatus bleeds, further comprises:
sending a control signal to control the protection device to be closed;
collecting the current of a branch where a current leakage device is located to execute second judgment for determining whether the branch where the current leakage device is located has overcurrent;
when the second judgment is established, the pulse discharge circuit is controlled to be conducted before the main mechanical switch is switched on, so that an artificial current zero crossing point is formed when the contacts of the main mechanical switch are separated.
5. The method of claim 4, wherein after the step of performing the second determination of whether the branch in which the bleeding apparatus is located is over-current, the method further comprises:
and when the second judgment is not satisfied, sending a breaking signal to the main mechanical switch to control the main mechanical switch to be switched on and off, sending a conducting signal to control the first solid-state switch to be switched on, and then controlling the first solid-state switch to be switched on and off.
6. The switching control method of a discharging device according to any of claims 2 to 5, wherein said protection device is an MOV arrester or a discharge gap.
7. The switching control method of the bleeding device according to claim 1, wherein the step of monitoring whether the fault state of the corresponding faulty branch has been resolved comprises:
and monitoring whether the breaker on the fault branch successfully cuts off the fault and whether the breaker is successfully reclosed, wherein when the breaker successfully cuts off the fault or the breaker is successfully reclosed, the fault state of the fault branch is removed.
8. The method for controlling the switches of the drainage apparatus according to any one of claims 1 to 5 or 7, wherein the step of controlling the second solid-state switches in the corresponding secondary drainage channels to be turned on and off after sending the breaking signal to the corresponding secondary mechanical switches in each secondary drainage channel and sending the conducting signal to the corresponding second solid-state switches in each secondary drainage channel until the switches in all the secondary drainage channels are turned on and off includes:
sequentially selecting secondary drainage channels according to a preset sequence;
when the secondary drainage channel is selected, sending a breaking signal to a secondary mechanical switch in the secondary drainage channel and sending a conducting signal to a second solid-state switch in the secondary drainage channel;
controlling the second solid-state switch in the secondary drainage channel to be switched on and off, and judging whether the quantity of the cumulatively selected secondary drainage channels reaches the total quantity of the secondary drainage channels required to be conducted;
if yes, stopping selecting the secondary discharge channel;
if not, returning to continue selecting the next drainage channel.
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