CN109861183B - Direct current breaker and using method thereof - Google Patents
Direct current breaker and using method thereof Download PDFInfo
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- CN109861183B CN109861183B CN201910046366.5A CN201910046366A CN109861183B CN 109861183 B CN109861183 B CN 109861183B CN 201910046366 A CN201910046366 A CN 201910046366A CN 109861183 B CN109861183 B CN 109861183B
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Abstract
The invention discloses a direct current breaker and a using method thereof, wherein the direct current breaker comprises a main on branch MC, a main off branch MB, an energy absorption branch EA and an auxiliary branch, wherein the main on branch MC is formed by connecting a quick mechanical switch FD and a load current switch LCS in series; the main breaking branch MB is connected in parallel with the main passing branch MC,the circuit comprises an external diode rectifier bridge and an internal bridge circuit based on a half-controlled device; the energy absorption branch EA comprises a quick discharge branch EA1 and a lightning arrester voltage limiting branch EA2 based on a half-control device; the auxiliary branch circuit is provided with an auxiliary resistor RauxAnd an auxiliary switch SwAre connected in series. The direct current breaker can realize rapid reclosing and rapid removal of small current, and has the advantages of large turn-off capacity and high removal speed.
Description
Technical Field
The invention relates to the field of direct current circuit breakers, in particular to a direct current circuit breaker and a using method thereof.
Background
The flexible direct-current power transmission technology based on the Modular Multilevel Converter (MMC) has wide application prospect in the fields of large-scale distributed energy grid connection, asynchronous power grid interconnection, urban direct-current power transmission and distribution and the like. However, the direct-current fault current of the direct-current power grid has high rising speed and large amplitude, and higher requirements are provided for the protection technology of the direct-current system. The fault clearing technology based on the direct current circuit breaker can quickly isolate the fault and ensure that the non-fault part of the system continues to normally operate.
The current dc circuit breaker can be mainly divided into a full-control device-based dc circuit breaker and a half-control device-based dc circuit breaker. The direct current circuit breaker based on the full-control device utilizes the current turn-off capability of the full-control device, can rapidly turn off the fault current after the current is transferred to the branch circuit of the full-control device, but the turn-off capacity of the direct current circuit breaker is limited by the saturated current of the full-control device, is limited, and has extremely high cost. Compared with a full-control device, the half-control device has the advantages of large capacity, low cost, good stability and the like. Because the semi-controlled device does not have the capability of directly switching off current, the existing direct current circuit breaker based on the semi-controlled device mostly utilizes a pre-charging capacitor to switch off the semi-controlled device. However, the additional capacitor pre-charge power supply would increase the complexity and cost of the circuit breaker; during the turn-off process, the fault current can charge the capacitor to the system protection voltage, which causes the cut-off time of the direct current breaker partially based on the half-control device when cutting off the small current to be greatly increased; after the circuit breaker is turned off, the polarity of the capacitor voltage is opposite to that before the circuit breaker is turned off, and in order to enable the circuit breaker to recover the turn-off capacity, the direct current circuit breaker based on the semi-controlled device needs extra capacitor voltage recovery time, so that the rapid reclosing is difficult to realize.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a direct current breaker which is composed of a half-control device, a diode, a capacitor and an inductor, does not contain a full-control device, and has the advantages of low cost, small conduction loss and large capacity; the direct current breaker utilizes line voltage to pre-charge the capacitor without an additional pre-charge power supply; the direct current breaker provides extra capacitor charging current by using the auxiliary branch circuit, so that the rapid turn-off of small current is realized; the direct current breaker has the rapid reclosing capability.
Another object of the present invention is to provide a method for using the dc circuit breaker.
The purpose of the invention can be realized by the following technical scheme:
a direct current breaker comprises a main on branch MC, a main off branch MB, an energy absorption branch EA and an auxiliary branch, wherein the main on branch MC is formed by connecting a quick mechanical switch FD and a load current switch LCS in series; the main breaking branch MB is connected with the main passing branch MC in parallel and comprises an external diode rectifier bridge and an internal bridge circuit based on a half-control device; the energy absorption branch EA comprises a quick discharge branch EA1 and a lightning arrester voltage limiting branch EA2 based on a half-control device; the auxiliary branch circuit is provided with an auxiliary resistor RauxAnd an auxiliary switch SwAre connected in series.
Further, the load current switch LCS comprises two sets of current transfer switches with load current turn-off capability connected in series in an opposite direction.
Further, each group of current transfer switches is composed of a full-control device (IGBT, IGCT, etc.) with current turn-off capability and an anti-parallel diode.
Furthermore, the main breaking branch MB comprises an external diode rectifier bridge and an internal bridge circuit based on a half-controlled device, a D1 bridge arm and a D2 bridge arm of the diode rectifier bridge are connected with a common cathode, and anodes of the two bridge arms are respectively connected with a current inflow end and a current outflow end of the main passing branch MC; the common anodes of a D3 bridge arm and a D4 bridge arm of the diode rectifier bridge are connected, and the cathodes of the two bridge arms are respectively connected with the current inflow end and the current outflow end of the main through branch MC; the bridge circuit based on the half-control devices comprises an inductor, a capacitor and 4 half-control devices, wherein the 4 half-control devices are respectively marked as Ta, Tb, Tc and Td, Ta and Tc are connected in series, Tb and Td are connected in series, Ta and Tb are connected in a common anode mode, Tc and Td are connected in a common cathode mode, one end of the inductor and the capacitor after being connected in series is connected with a Ta cathode, namely a Tc anode, and the other end of the inductor and the capacitor after being connected in series is connected with a Tb cathode; the common anode of Ta and Tb of the bridge circuit is connected with the common cathode of D1 and D2, and the common cathode of Tc and Td is connected with the common anode of D3 and D4.
Further, the energy absorption branch EA comprises a quick discharge branch EA1 based on a half-controlled device and an arrester voltage limiting branch EA 2; the quick discharge branch EA1 based on the half-controlled device comprises a half-controlled device Tf and a discharge resistor R4, wherein one end of EA1 is connected with the cathode of Tb, and the other end of EA1 is connected with the cathode of Ta; the arrester voltage limiting branch EA2 comprises an arrester MOV, a resistor R3 and a diode D5, one end of the MOV is connected with the cathode of Ta, the other end of the MOV is connected with the cathode of D5, the anode of D5 is connected with the connection point of an inductor and a capacitor, and R3 is connected with the MOV in parallel.
Further, the auxiliary branch comprises an auxiliary switch Sw and an auxiliary resistor Rux which are connected in series; one end of the auxiliary branch is connected with the common anode of D3 and D4 of the diode rectifier bridge, and the other end of the auxiliary branch is grounded. Auxiliary switch SwConsists of a quick isolating switch or a semi-controlled device.
Further, the semi-controlled device is a thyristor with controllable turn-on capability and uncontrollable turn-off.
The other purpose of the invention can be realized by the following technical scheme:
a method for using a direct current breaker comprises the steps that in the using process, a semi-control device trigger signal needs to be sent when a capacitor is precharged, the semi-control device trigger signal needs to be sent when current is transferred, and the semi-control device trigger signal needs to be sent when the current is turned off; due to the symmetry of the topology of the direct current circuit breaker, different trigger combination modes can be adopted as shown in the following table:
the use method of the direct current breaker specifically comprises the following steps:
step 1, after a direct current breaker is connected into a system, selecting a trigger combination m, wherein m is 1 and 2; closing auxiliary switch SwSending a capacitor pre-charging trigger instruction according to the selected trigger combination m, and charging the capacitor by the system;
after the sum of the capacitor voltages exceeds the system voltage, the charging current is continuously reduced, and when the charging current is smaller than the holding current of the half-control device, the conducted half-control device is naturally turned off, and the Sw is turned off; the line fault belongs to an accidental event, the direct current breaker is in a standby state in most of time, and the capacitance energy can be slowly dissipated due to the existence of leakage current; when the capacitor voltage is smaller than the threshold value, closing the Sw again, sending a capacitor pre-charging trigger instruction according to the selected trigger combination m, and recharging the capacitor;
step 2, under normal conditions, system current flows through the main pass branch MC, and the load current switch of the main pass branch MC only provides current transfer voltage and does not need to bear system voltage, so that the direct current circuit breaker has very low conduction loss;
3, a direct-current line fault occurs at t1, the protection detects the fault at t2, a current transfer trigger instruction is immediately sent according to the trigger combination m selected in the step 1, a load current switch is turned off at the same time, and the current starts to transfer to a main breaking branch MB;
step 4, when the main branch current is 0 at the moment of t3, the fast mechanical switch FD is opened without arc at the moment;
step 5, at the moment of t4, sending a current turn-off trigger instruction according to the trigger combination m selected in the step 1; the fault current starts to reversely charge the capacitor, and gradually decreases along with the charge of the capacitor voltage; when the value of the current to be cut off is small, the auxiliary switch is closed except for sending a current turn-off trigger instruction; the closing of the auxiliary switch provides extra charging current for the capacitor, so that the charging speed of the capacitor is increased, the turn-off speed of small current is correspondingly increased, and the auxiliary switch is opened again after the current is cut off; in order to ensure that the quick mechanical switch reliably recovers insulation and reduce the turn-off time of the circuit breaker as much as possible, the value of t4 needs to be reasonably selected, and t4 does not exceed the time when the quick mechanical switch completely recovers insulation at the latest;
step 6, once the capacitor voltage exceeds the reference voltage of the lightning arrester, the fault current flowing through the capacitor is quickly transferred to an EA2 branch circuit; because the reference voltage of the lightning arrester is greater than the rated voltage of the system, the current of the system can be continuously reduced; when the fault current is smaller than the maintaining current of the half-control device, the half-control device in the current path is naturally turned off; finally, the isolating switch on the line isolates the fault line from the rest part of the system;
step 7, after the fault line is isolated and switched off, Tf is switched on, and the capacitor is rapidly discharged through the inductor, R4 and Tf; after the capacitor voltage is discharged to zero, Ta and Td are switched on, and the capacitor voltage is charged to the system voltage again;
step 8, after waiting for a certain line insulation recovery time, starting a reclosing process and sending a current transfer trigger instruction to the breaker; if the line current is gradually recovered to be normal, meaning that the fault is cleared, the quick mechanical switch and the load current switch can be closed in sequence, the current is automatically transferred to the main on branch, and a half-control device in the main off branch is naturally turned off; if the line current rises rapidly again and exceeds the protection fixed value, which means that a permanent fault occurs in the line, a current cut-off trigger command is sent, and the direct current breaker can cut off the fault line again. Therefore, the direct current breaker has the rapid reclosing capability.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. the direct current breaker provided by the invention is composed of a diode, a half-control device, an inductor and a capacitor, does not contain a full-control device, and has the advantages of low cost and large turn-off capacity.
2. The direct current breaker provided by the invention utilizes the line voltage to pre-charge the capacitor, and an additional pre-charge power supply is not needed.
3. The direct current breaker provided by the invention utilizes the auxiliary branch circuit to provide extra capacitor charging current, thereby realizing the rapid turn-off of small current.
4. The direct current breaker provided by the invention has the capability of quick reclosing.
Drawings
Fig. 1 is a topology structure diagram of a dc circuit breaker according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example (b):
the embodiment provides a dc circuit breaker, and the dc circuit breaker topology is shown in fig. 1 and includes a main open branch MC, a main open branch MB and an auxiliary branch. The main branch circuit comprises a load current switch LCS and a quick mechanical switch FD; the main breaking branch is connected with the main connecting branch in parallel and comprises an external diode rectifier bridge and an internal bridge circuit based on a half-control device; the auxiliary branch comprises an auxiliary resistor and an auxiliary switch.
The main branch circuit is formed by connecting a load current switch and a quick mechanical switch in series; the load current switch is formed by connecting two groups of current transfer switches with load current turn-off capability in series in an opposite direction; each group of current transfer switches consists of fully-controlled devices such as IGBT and IGCT with current turn-off capability and anti-parallel diodes.
The main breaking branch comprises an external diode rectifier bridge and an internal bridge circuit based on a half-control device; the D1 bridge arm and the D2 bridge arm of the diode rectifier bridge are connected with the common cathode, and the anodes of the two bridge arms are respectively connected with the left end and the right end of the main branch circuit; the D3 bridge arm and the D4 bridge arm of the diode rectifier bridge are connected in a common anode mode, and cathodes of the D3 bridge arm and the D4 bridge arm are connected with the left end and the right end of the main through branch respectively; the bridge circuit based on the half-controlled devices comprises an inductor, a capacitor and 4 half-controlled devices, wherein the 4 half-controlled devices are respectively marked as Ta, Tb, Tc and Td, Ta and Tc are connected in series, Tb and Td are connected in series, Ta and Tb are connected in a common anode mode, Tc and Td are connected in a common cathode mode, one end of the inductor and the capacitor after being connected in series is connected with a Ta cathode (Tc anode), and the other end of the inductor and the capacitor after being connected in series is connected with a Tb cathode (Td anode); the common anode of Ta and Tb of the bridge circuit is connected with the common cathode of D1 and D2, and the common cathode of Tc and Td is connected with the common anode of D3 and D4.
The energy absorption branch EA comprises a quick discharge branch EA1 and a lightning arrester voltage limiting branch EA2 based on a half-control device; the quick discharge branch EA1 based on the half-controlled device comprises a half-controlled device Tf and a discharge resistor R4, wherein one end of EA1 is connected with the cathode of Tb, and the other end of EA1 is connected with the cathode of Ta; the arrester voltage limiting branch EA2 comprises an arrester MOV, a resistor R3 and a diode D5, one end of the MOV is connected with the cathode of Ta, the other end of the MOV is connected with the cathode of D5, the anode of D5 is connected with the connection point of an inductor and a capacitor, and R3 is connected with the MOV in parallel.
The auxiliary branch circuit is provided with an auxiliary resistor RauxAnd an auxiliary switch SwAre connected in series. One end of the auxiliary branch is connected with the common anode of D3 and D4 of the diode rectifier bridge, and the other end of the auxiliary branch is grounded; the auxiliary switch may be comprised of a fast isolation switch or a semi-controlled device. Specifically, the semi-controlled device is a thyristor with controllable conduction capability and uncontrollable turn-off.
When the direct current circuit breaker is used, a semi-control device trigger signal needs to be sent when the capacitor is precharged, the semi-control device trigger signal needs to be sent when current is transferred, and the semi-control device trigger signal needs to be sent when the current is turned off. Due to the symmetry of the dc breaker topology, different trigger combinations can be adopted, see table 1.
TABLE 1 trigger combination of half-controlled devices
| Trigger combination | Capacitor precharge trigger command | Current transfer trigger instruction | Current off trigger command |
| Combination 1 | Conducting Ta, Td | Conducting Ta and Tc | Conducting Tb |
| Combination 2 | Conducting Ta, Td | Turn on Tb, Td | Conduction Tc |
In this embodiment, a method for using the dc circuit breaker will be described by taking the trigger assembly 1 as an example. The using method comprises the following steps:
step 1, after a direct current breaker is connected into a system, selecting a trigger combination 1; closing auxiliary switch SwAnd sending a capacitor pre-charging trigger command according to the selected trigger combination 1, namely turning on Ta and Td, charging the capacitor by a system, wherein two capacitor charging paths are provided: D1-Ta-C-L-Td-Sw—Raux；D2—Ta—C—L—Td—Sw—Raux；
When the sum of the capacitor voltages exceeds the system voltage, the charging current is continuously reduced, and when the charging current is less than the holding current of the semi-control device, the conducted semi-control device is naturally turned off, and S is turned offw；
Step 2, under normal conditions, system current flows through the main through branch, and the direct current breaker has low conduction loss because a load current switch of the main through branch only provides current transfer voltage and does not need to bear system voltage;
step 3, a direct current line fault occurs at t1, the protection detects the fault at t2, and immediately sends a current transfer trigger instruction according to the trigger combination 1 selected in the step 1, namely Ta and Tc are switched on, and a load current switch is switched off at the same time; the current starts to transfer to the main broken branch;
step 4, when the main branch current is 0 at the moment t3, the fast mechanical switch FD is opened without arc at the moment; after the fast mechanical switch FD is opened, the current path inside the direct current breaker is as follows: D1-Ta-Tc-D4;
step 5, at time t4, a current turn-off trigger instruction is sent according to the trigger combination 1 selected in the step 1, namely Tb is turned on; the capacitor discharges through an inductor L, a thyristor Ta and a thyristor Tb, and the discharge current of the capacitor is opposite to the direction of fault current flowing through Ta; at the time of t5, the capacitor current is equal to the fault current, the Ta current is reduced to 0 and is reversely biased, and the capacitor discharges through the diode rectifier bridge; when the reverse bias time of Ta is longer than the turn-off time of Ta, Ta is reliably turned off; at time t6, the capacitor current is again equal to the fault current, which reversely charges the capacitor through D1, Tb, L, Tc, D4; as the capacitor charges, the fault current gradually decreases; when the required cutting-off current value is small, the auxiliary switch Sw is closed except for sending a current turn-off trigger instruction; the closing of the auxiliary switch provides extra charging current for the capacitor, so that the charging speed of the capacitor is increased, the turn-off speed of the small current is correspondingly increased, and the auxiliary switch is opened again after the current is cut off. In order to reduce the turn-off time of the circuit breaker as much as possible while ensuring the reliable insulation recovery of the quick mechanical switch, the value of t4 needs to be reasonably selected, and t4 does not exceed the time when the quick mechanical switch completely recovers the insulation at the latest.
Step 6, once the capacitor voltage exceeds the reference voltage of the lightning arrester, the fault current flowing through the capacitor is quickly transferred to an EA2 branch circuit; because the reference voltage of the lightning arrester is greater than the rated voltage of the system, the current of the system can be continuously reduced; at the time t7, the fault current is smaller than the holding current of the half-controlled device, and Tb and Tc in the current path are naturally turned off; finally, the isolating switch on the line isolates the fault line from the rest part of the system;
step 7, after the fault line is isolated and switched off, Tf is switched on, and the capacitor is rapidly discharged through the inductor, R4 and Tf; after the capacitor voltage is discharged to zero, Ta and Td are switched on, and the capacitor voltage is charged to the system voltage again; step 6, after waiting for a certain line insulation recovery time, starting a reclosing process; if the line current is gradually recovered to be normal, meaning that the fault is cleared, the rapid mechanical switch and the load current switch can be closed in sequence, the current is automatically transferred to the main on branch, and Ta and Tc in the main off branch are naturally turned off; if the line current rises rapidly again and exceeds the protection fixed value, which means that permanent fault occurs in the line, a current turn-off trigger command is sent, namely Tb is turned on, and the direct current breaker can cut off the fault line again. Therefore, the direct current breaker has the rapid reclosing capability.
The above description is only for the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and the inventive concept within the scope of the present invention, which is disclosed by the present invention, and the equivalent or change thereof belongs to the protection scope of the present invention.
Claims (6)
1. A kind of direct current breaker, its characterized in that: the direct-current circuit breaker comprises a main on branch MC, a main off branch MB, an energy absorption branch EA and an auxiliary branch, wherein the main on branch MC is formed by connecting a quick mechanical switch FD and a load current switch LCS in series; the main breaking branch MB is connected with the main passing branch MC in parallel and comprises an external diode rectifier bridge and an internal bridge circuit based on a half-control device; the auxiliary branch circuit is provided with an auxiliary resistor RauxAnd an auxiliary switch SwAre connected in series;
the main breaking branch MB comprises an external diode rectifier bridge and an internal bridge circuit based on a half-control device, a D1 bridge arm and a D2 bridge arm of the diode rectifier bridge are connected in a common cathode mode, and anodes of the two bridge arms are respectively connected with a current inflow end and a current outflow end of the main passing branch MC; the common anodes of a D3 bridge arm and a D4 bridge arm of the diode rectifier bridge are connected, and the cathodes of the two bridge arms are respectively connected with the current inflow end and the current outflow end of the main through branch MC; the bridge circuit based on the half-control devices comprises an inductor, a capacitor and 4 half-control devices, wherein the 4 half-control devices are respectively marked as Ta, Tb, Tc and Td, Ta and Tc are connected in series, Tb and Td are connected in series, Ta and Tb are connected in a common anode mode, Tc and Td are connected in a common cathode mode, one end of the inductor and the capacitor after being connected in series is connected with a Ta cathode, namely a Tc anode, and the other end of the inductor and the capacitor after being connected in series is connected with a Tb cathode; the common anode of Ta and Tb of the bridge circuit is connected with the common cathode of D1 and D2, and the common cathode of Tc and Td is connected with the common anode of D3 and D4;
the energy absorption branch EA comprises a quick discharge branch EA1 and a lightning arrester voltage limiting branch EA2 based on a half-control device; the quick discharge branch EA1 based on the half-controlled device comprises a half-controlled device Tf and a discharge resistor R4, wherein one end of EA1 is connected with the cathode of Tb, and the other end of EA1 is connected with the cathode of Ta; the arrester voltage limiting branch EA2 comprises an arrester MOV, a resistor R3 and a diode D5, one end of the MOV is connected with the cathode of Ta, the other end of the MOV is connected with the cathode of D5, the anode of D5 is connected with the connection point of an inductor and a capacitor, and R3 is connected with the MOV in parallel;
the auxiliary branch is composed of an auxiliary switch Sw and an auxiliary resistor RauxAre connected in series; one end of the auxiliary branch is connected with the common anode of D3 and D4 of the diode rectifier bridge, and the other end of the auxiliary branch is grounded; auxiliary switch SwConsists of a quick isolating switch or a semi-controlled device.
2. A direct current circuit breaker according to claim 1, characterized in that: the load current switch LCS is formed by connecting two groups of current transfer switches with load current turn-off capability in reverse series.
3. A direct current circuit breaker according to claim 2, characterized in that: each group of current transfer switches consists of a full-control type device with current turn-off capability and an anti-parallel diode.
4. A direct current circuit breaker according to claim 1, characterized in that: the semi-controlled device is a thyristor with controllable turn-on capability and uncontrollable turn-off.
5. The method of using the dc circuit breaker of claim 1, wherein: in the using process, a semi-control device trigger signal needs to be sent when the capacitor is precharged, the semi-control device trigger signal needs to be sent when the current is transferred, and the semi-control device trigger signal needs to be sent when the current is turned off; due to the symmetry of the topology of the direct current circuit breaker, two different trigger combination modes are adopted: combination 1 and combination 2; for combination 1, the capacitor and charge trigger command will turn on Ta and Td, the current transfer trigger command will turn on Ta and Tc, and the current turn-off trigger command will turn on Tb; for combination 2, the capacitor precharge trigger command will turn on Ta and Td, the current transfer trigger command will turn on Tb and Td, and the current off trigger command will turn on Tc.
6. Use of a direct current circuit breaker according to claim 5, characterized in that it comprises in particular the following steps:
step 1, after a direct current breaker is connected into a system, selecting a trigger combination m, wherein m is 1 and 2; closing auxiliary switch SwSending a capacitor pre-charging trigger instruction according to the selected trigger combination m, and charging the capacitor by the system;
when the sum of the capacitor voltages exceeds the system voltage, the charging current is continuously reduced, and when the charging current is less than the holding current of the semi-control device, the conducted semi-control device is naturally turned off, and S is turned offw(ii) a The line fault belongs to an accidental event, the direct current breaker is in a standby state in most of time, and the capacitance energy can be slowly dissipated due to the existence of leakage current; when the capacitor voltage is less than the threshold value, closing S againwSending a capacitor pre-charging trigger command according to the selected trigger combination m, and recharging the capacitor;
step 2, under normal conditions, system current flows through the main pass branch MC, and the load current switch of the main pass branch MC only provides current transfer voltage and does not need to bear system voltage, so that the direct current circuit breaker has very low conduction loss;
step 3, a direct-current line fault occurs at the moment of t1, the protection detects the fault at t2, a current transfer trigger instruction is immediately sent according to the trigger combination m selected in the step 1, a load current switch is turned off at the same time, and the current starts to transfer to a main breaking branch MB;
step 4, when the main branch current is 0 at the moment of t3, the fast mechanical switch FD is opened without arc at the moment;
step 5, at the moment of t4, sending a current turn-off trigger instruction according to the trigger combination m selected in the step 1; the fault current starts to reversely charge the capacitor, and gradually decreases along with the charging of the capacitor; when the value of the current to be cut off is small, the auxiliary switch is closed except for sending a current turn-off trigger instruction; the closing of the auxiliary switch provides extra charging current for the capacitor, so that the charging speed of the capacitor is increased, the turn-off speed of small current is correspondingly increased, and the auxiliary switch is opened again after the current is cut off; in order to ensure that the quick mechanical switch reliably recovers insulation and reduce the turn-off time of the circuit breaker as much as possible, the value of t4 needs to be reasonably selected, and t4 does not exceed the time when the quick mechanical switch completely recovers insulation at the latest;
step 6, once the capacitor voltage exceeds the reference voltage of the lightning arrester, the fault current flowing through the capacitor is quickly transferred to an EA2 branch circuit; because the reference voltage of the lightning arrester is greater than the rated voltage of the system, the current of the system can be continuously reduced; when the fault current is smaller than the maintaining current of the half-control device, the half-control device in the current path is naturally turned off; finally, the isolating switch on the line isolates the fault line from the rest part of the system;
step 7, after the fault line is isolated and switched off, Tf is switched on, and the capacitor is rapidly discharged through the inductor, R4 and Tf; after the capacitor voltage is discharged to zero, Ta and Td are switched on, and the capacitor voltage is charged to the system voltage again;
step 8, after waiting for a certain line insulation recovery time, starting a reclosing process and sending a current transfer trigger instruction to the breaker; if the line current is gradually recovered to be normal, meaning that the fault is cleared, the quick mechanical switch and the load current switch are closed in sequence, the current is automatically transferred to the main on branch, and a half-control device in the main off branch is naturally turned off; if the line current rises rapidly again and exceeds the protection fixed value, which means that a permanent fault occurs in the line, a current cut-off trigger command is sent, and the direct current breaker cuts off the fault line again.
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| CN116865738B (en) * | 2023-09-04 | 2023-11-28 | 中国科学院电工研究所 | Direct-current solid-state circuit breaker circuit topology based on semi-controlled device and control method |
| CN117013510A (en) * | 2023-09-27 | 2023-11-07 | 国网江苏省电力有限公司电力科学研究院 | Superconductive current-limiting hybrid direct current breaker for controllable energy dissipation |
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| WO2015078525A1 (en) * | 2013-11-29 | 2015-06-04 | Siemens Aktiengesellschaft | Device and method for switching a direct current |
| CN106099878B (en) * | 2016-08-04 | 2019-01-29 | 华中科技大学 | A kind of capacitor charging type bidirectional, dc breaker and its application |
| CN108092253B (en) * | 2017-12-29 | 2020-02-18 | 东南大学 | Capacitive hybrid direct-current circuit breaker for direct-current power grid and control method thereof |
| CN109193625B (en) * | 2018-09-11 | 2020-06-19 | 华南理工大学 | Novel combined direct current breaker topology |
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2019
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