CN218829040U - Parallel capacitance type direct current controllable lightning arrester device - Google Patents
Parallel capacitance type direct current controllable lightning arrester device Download PDFInfo
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- CN218829040U CN218829040U CN202223185566.5U CN202223185566U CN218829040U CN 218829040 U CN218829040 U CN 218829040U CN 202223185566 U CN202223185566 U CN 202223185566U CN 218829040 U CN218829040 U CN 218829040U
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- lightning arrester
- arrester
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- direct current
- lightning
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The utility model relates to the technical field of lightning arresters, in particular to a parallel capacitance type direct current controllable lightning arrester device, which comprises a lightning arrester body, a capacitor and a hybrid switch, wherein the lightning arrester body comprises a lightning arrester fixing part and a lightning arrester controllable part, the lightning arrester fixing part and the lightning arrester controllable part are at least one column of lightning arrester unit, and the lightning arrester fixing part and the capacitor form an upper end connection direct current high-voltage transmission line of a parallel circuit; this controllable arrester of parallel capacitance formula direct current makes in direct current transmission system, when the contravariant side converter takes place commutation failure or thunder and lightning invasion, causes direct current system in the voltage too high, when direct current survey system voltage too high or can have certain interchange, the parallelly connected too much energy of absorption of a plurality of arresters two, parallel capacitance then plays the effect of voltage-sharing to arrester fixed part internal voltage to play and avoid the protection that the thunder and lightning entered the ripples to converter valve station or electrical equipment.
Description
Technical Field
The utility model relates to an arrester technical field specifically is a controllable arrester device of electric capacity parallel direct current.
Background
With the continuous improvement of the direct current transmission capacity, the phenomenon of strong direct current and weak alternating current is displayed, the short circuit phenomenon is further reduced due to the increase of the number of direct current transmission lines, the electrical distance between each inverter station is short, and the phase change failure of multiple direct currents possibly caused by the fault of an alternating current system in the near area of the converter station is likely to occur, so that the safe and stable operation of an alternating current and direct current system is further affected. If the inversion side fails to change phase, the power of the rectification side cannot be normally sent out, and one end of the load cannot normally consume energy, so that the system overvoltage is caused. In addition, the overhead transmission line fault classification statistics in recent years in China shows that the tripping caused by lightning stroke accounts for 40-70% of various factors of the tripping of high-voltage and ultrahigh-voltage transmission lines, and particularly in areas with much lightning, high soil resistivity and complex terrain, the equipment fault rate is frequently caused by the overvoltage of a line system caused by the lightning stroke.
In the prior art, a ZnO arrester is an ideal technical means for suppressing overvoltage at present because of good nonlinear characteristics, but in a direct current system, when a converter on an inverter side fails to change phase, when a conventional arrester is adopted for energy discharge and overvoltage suppression, the current flowing through the arrester is large and lasts for a long time (tens of milliseconds), the energy absorbed by the arrester reaches hundreds of megajoules, the number of columns connected in parallel reaches hundreds of columns according to the current absorption capacity level of a ZnO resistance chip, the residual voltage is still high, the overvoltage limiting level cannot meet the system requirements easily, the chargeability is high under normal operation voltage, the aging speed of the ZnO resistance chip is accelerated, and the reliability is reduced.
SUMMERY OF THE UTILITY MODEL
In order to overcome the above-mentioned defects of the prior art, the embodiments of the present invention provide a parallel capacitive dc controllable lightning arrester device to solve the problems existing in the above-mentioned background art.
A parallel capacitor type direct current controllable lightning arrester device comprises a lightning arrester body, a capacitor and a hybrid switch, wherein the lightning arrester body comprises a lightning arrester fixing part and a lightning arrester controllable part, the lightning arrester fixing part and the lightning arrester controllable part are at least provided with a column of lightning arrester units, the upper end of a parallel circuit formed by the lightning arrester fixing part and the capacitor is connected with a direct current high-voltage transmission line, the other end of the lightning arrester fixing part is connected with the lightning arrester controllable part in series, the lower end of the parallel circuit formed by the lightning arrester controllable part and the hybrid switch is grounded, and the other end of the lightning arrester controllable part is connected with the lightning arrester fixing part;
the capacitor and the lightning arrester fixing part form a parallel circuit, the upper end of the capacitor is connected with a direct-current high-voltage transmission line, and the lower end of the capacitor is connected with the lightning arrester controllable part in series;
the hybrid switch comprises a thyristor valve switch and a hybrid direct-current circuit breaker, the hybrid switch is connected with the lower end of a parallel circuit formed by the controllable part of the lightning arrester and is grounded, the other end of the hybrid switch is connected with the fixed part of the lightning arrester, and the lightning arrester body comprises a first lightning arrester.
As a further improvement, the arrester body is fixed partially when arrester unit quantity is n, the mutual parallel connection of a plurality of arrester units.
As a further improvement of the utility model, the controllable part of arrester body when arrester unit quantity is n, the mutual parallel connection of a plurality of arrester units.
As the utility model discloses a further improvement, electric capacity and the fixed part of arrester constitute parallel circuit, and direct current high tension transmission line is connected to the upper end of electric capacity, the controllable part of lower extreme series connection arrester of electric capacity.
As a further improvement of the present invention, the thyristor valve switch comprises a single thyristor device or a plurality of series-connected thyristor devices.
As a further improvement of the present invention, the thyristor valve switch comprises a trigger module, the trigger module is connected in parallel to the anode, the cathode and the gate of the thyristor device, and the trigger module is used for detecting the voltage at both ends connected in parallel with the trigger module.
As a further improvement, the both ends voltage of thyristor device is compared with the predetermined threshold value, works as the both ends voltage of thyristor device is greater than when the predetermined threshold value, trigger and self are parallelly connected the thyristor device switches on.
As a further improvement of the utility model, switch hybrid direct current circuit breaker includes that mechanical switch, semiconductor power device and arrester constitute two, and mechanical switch, semiconductor power device and arrester connect in parallel two, mechanical switch is vacuum or SF 6 And (4) switching.
Adopt the utility model has the advantages of:
1. the utility model provides a controllable arrester device of electric capacity parallel direct current, this controllable arrester of parallel capacitance formula direct current makes in direct current transmission system, when contravariant side transverter takes place commutation failure or thunder and lightning invasion, cause direct current system medium voltage too high, survey system voltage too high or can have when certain interchange when direct current, the parallelly connected too much energy of absorption of a plurality of arresters two, parallel capacitance and then plays the effect of voltage-sharing to the fixed partial internal voltage of arrester, thereby play and avoid the protection that the thunder and lightning entered the ripples to converter valve station or electrical equipment.
2. The utility model provides a controllable arrester device of electric capacity parallel direct current, this controllable arrester of parallelly connected capacitanc direct current make in direct current transmission system, when initiating direct current thunder and lightning overvoltage, two parallelly connected can absorb too much through-flow energy of multicolumn arrester to guarantee that the arrester can not be punctured, improve the protective properties and the operational reliability of arrester.
3. The utility model discloses a mechanical switch is vacuum or SF 6 The mechanical switch is used for cutting off direct current leakage current flowing through the thyristor after the fault is eliminated, ensuring that the thyristor valve switch recovers the blocking state again after the overvoltage disappears, and greatly reducing the overvoltage level of VSC in the hybrid direct current or flexible direct current transmission systemThe number of series modules set for meeting the pressure-resistant requirement is reduced, and the manufacturing cost of a direct current system is effectively reduced.
Drawings
Fig. 1 is an equivalent schematic diagram of the present invention;
FIG. 2 is a schematic diagram of the present invention;
fig. 3 is a schematic diagram of the structure of the thyristor valve switch of the present invention;
fig. 4 is a working schematic diagram of the hybrid dc circuit breaker of the present invention.
Labeled as: 1. a lightning arrester body; 11. a lightning arrester fixing portion; 12. a controllable portion of the lightning arrester; 111. a first lightning arrester; 2. a capacitor; 3. a mixing switch; 31. a thyristor valve switch; 32. a hybrid direct current breaker; 311. a triggering module; 312. a thyristor device; 321. a mechanical switch; 322. a semiconductor power device; 323. an arrester.
Detailed Description
Referring to fig. 1, the utility model discloses a controllable arrester device of parallelly connected capacitanc direct current, including arrester body 1, electric capacity 2, hybrid switch 3, arrester body 1 includes arrester fixed part 11 and the controllable part 12 of arrester, arrester fixed part 11 and the controllable part 12 of arrester are an at least arrester unit all, arrester fixed part 11 constitutes parallel circuit's upper end direct current high tension transmission line with electric capacity 2, the controllable part 12 of other end series connection arrester of arrester fixed part 11, the lower extreme ground connection of the parallel circuit that the controllable part 12 of arrester and hybrid switch 3 constitute, arrester fixed part 11 is connected to the other end of the controllable part 12 of arrester, arrester body 1 includes arrester a 111, electric capacity 2 constitutes parallel circuit with arrester fixed part 11, direct current high tension transmission line is connected to the upper end of electric capacity 2, the controllable part 12 of lower extreme series connection arrester of electric capacity 2.
In the embodiment of the application, the capacitor 2 is connected with the lightning arrester fixing part 11 in parallel in a direct current transmission system, when a converter on the inversion side fails to change phase or invades thunder, the voltage in the direct current system is over high, or when the voltage of the direct current system is over high or certain alternating current can exist, a plurality of lightning arresters are connected in parallel to absorb excessive energy, and the parallel capacitor plays a role in voltage sharing for the internal voltage of the lightning arrester fixing part, so that the effect of avoiding thunder and lightning from entering waves to a converter valve station or electrical equipment is achieved.
Referring to fig. 2, the hybrid switch 3 includes a thyristor valve switch 31 and a hybrid dc breaker 32, the hybrid switch 3 is connected to the controllable part 12 of the lightning arrester to form a parallel circuit, the lower end of the parallel circuit is grounded, and the other end of the hybrid switch 3 is connected to the fixed part 11 of the lightning arrester;
referring to fig. 2 and 3, the hybrid switch 3 is connected to the controllable portion 12 of the arrester to form a parallel circuit, the lower end of the parallel circuit is grounded, the other end of the hybrid switch 3 is connected to the fixed portion 11 of the arrester, the thyristor valve switch 31 includes a trigger module 311, the trigger module 311 is connected in parallel to the anode, the cathode and the gate of the thyristor device 312, the trigger module 311 is configured to detect the voltage across the thyristor device 312, the voltage across the thyristor device 312 is compared with a preset threshold, and when the voltage across the thyristor device 312 is greater than the preset threshold, the thyristor device 312 connected in parallel to the thyristor device is triggered to be turned on.
In this embodiment, the thyristor valve switch 31 adopts a BOD self-triggering mode, the trigger module 311 is connected in parallel to the anode a, the gate G and the cathode K of the thyristor device 312, when the operating overvoltage is received, the trigger module 311 detects the voltage across the thyristor device 312 connected in parallel to the trigger module 311, the voltage across the thyristor device 312 is compared with the preset threshold, and when the voltage across the thyristor device 312 is greater than the preset threshold, the trigger module 311 breaks down and conducts, and the current flows to the gate of the thyristor device 312, thereby triggering the thyristor to conduct.
Referring to fig. 2 and 4, the switching hybrid dc circuit breaker 32 includes: a mechanical switch 321, a semiconductor power device 322 and a second lightning arrester 323; the hybrid dc breaker 32 has the low-loss current carrying, insulation quick recovery capability of a mechanical dc breaker and the quick on/off capability of a switch, the mechanical switch being vacuum or SF 6 The mechanical switch is used for cutting off direct current leakage current flowing through the thyristor after the fault is eliminated, the condition that the thyristor valve switch restores the blocking state again after overvoltage disappears is ensured, and the VSC in a hybrid direct current or flexible direct current transmission system can be greatly reducedAn overvoltage level.
The thyristor valve switch 31 comprises a single thyristor device 312 or a plurality of series-connected thyristor devices 312, a mechanical switch 321, a semiconductor power device 322 and an arrester 323 are connected in parallel, the mechanical switch 321 is vacuum or SF 6 The switch, hybrid dc breaker 32 has the low-loss current, insulation quick recovery capability and switch quick disconnect capability of mechanical dc breakers, vacuum or SF 6 Mechanical switch cuts off the direct current leakage current that flows through the thyristor after the trouble is eliminated with mechanical switch, guarantees that thyristor valve switch resumes the blocking state again after overvoltage disappears, can reduce the overvoltage level of VSC among mixed direct current or the flexible direct current transmission system by a wide margin, reduces the series module quantity that sets up for satisfying withstand voltage requirement, effectively reduces the direct current system cost:
the utility model discloses a theory of operation does:
when the system normally operates, the whole lightning arrester bears the normal operation voltage of the system, the capacitor 2 has the voltage-sharing effect on the fixed part of the lightning arrester, the thyristor valve switch 31 is in an off state, the hybrid direct-current circuit breaker 32 is in a closed state, and the whole hybrid switch 3 is in an off state. At this time, the system voltage is shared by the fixed and controllable parts of the arrester body, and the hybrid switch 3 is at the same voltage as the controllable part. When the inverter side converter of the system has phase change failure or lightning invasion, the voltage in the direct current system is caused to be overhigh, the power of a transmission end is overlarge, at the moment, the voltage value of the system exceeds the set threshold value of a thyristor valve, and the parallel capacitor 2 plays a role in voltage sharing on the operation overvoltage born by the lightning arrester fixing part 11 and the lightning overvoltage inside the lightning arrester fixing part 11;
the thyristor valve switch 31 is switched from an off state to an on state, the hybrid direct current breaker 32 keeps the on state unchanged, the hybrid switch 2 is in the on state at the moment, the controllable part is short-circuited, and the fixed part bears the system overvoltage, so that the deep suppression of the system operation or the lightning overvoltage and the protection of the lightning arrester are realized. Because the thyristor device 312 always bears the forward voltage, after the thyristor device is conducted, if the trigger module detects that the voltage values at the two ends of the thyristor device 312 are greater than the set threshold value, the thyristor switch 31 cannot be automatically disconnected, and the controllable part of the arrester is always short-circuited, then a certain risk is brought to the fixed part 11 of the arrester, so that the thyristor switch cannot be operated all the time, after the overvoltage disappears, the hybrid direct-current circuit breaker is used for rapidly cutting off the current in advance, at this time, the hybrid direct-current circuit breaker sends a breaking action signal to the mechanical switch 321, the mechanical switch 321 receives the breaking action signal, the contacts are separated, effective arc voltage is established between the contacts, arc discharge is carried out until the current of the mechanical switch 321 is 0, then the medium intensity in the mechanical switch is rapidly recovered, under the action of the arc voltage, the current conversion branch is switched from the main branch to the current conversion branch, a signal is sent to the power electronic device, the current switching control system sends a switching-off signal to the power electronic device at a certain moment, the power electronic device is switched from being switched on to be switched off, and then transferred to the voltage limiter branch to absorb excessive energy until the breaking current is completed;
the voltage value at the two ends of the thyristor valve switch 31 is smaller than the set threshold value, and the thyristor valve switch 31 is naturally cut off. The current is cut off through the hybrid direct current breaker 32, and then the thyristor valve switch 31 is cut off, and the arrester body 1 normally recovers to the initial state, has avoided the arrester body 1 to damage because of too big electric current, treats that direct current system normal operating back will mix direct current breaker 32 and close again. The whole on-off process reduces the chargeability of the whole lightning arrester under normal operating voltage, improves the safety margin and enhances the reliability.
Any feature disclosed in this specification may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise; all of the disclosed features, or all of the method or process steps, may be combined in any combination, except mutually exclusive features and/or steps.
Claims (6)
1. The utility model provides a controllable arrester device of parallelly connected capacitanc direct current, includes arrester body (1), electric capacity (2), hybrid switch (3), its characterized in that: the lightning arrester comprises a lightning arrester body (1) and a lightning arrester controllable part (12), wherein the lightning arrester fixing part (11) and the lightning arrester controllable part (12) are at least one lightning arrester unit, the upper end of a parallel circuit formed by the lightning arrester fixing part (11) and a capacitor (2) is connected with a direct-current high-voltage transmission line, the other end of the lightning arrester fixing part (11) is connected with the lightning arrester controllable part (12) in series, the lower end of the parallel circuit formed by the lightning arrester controllable part (12) and a hybrid switch (3) is grounded, the other end of the lightning arrester controllable part (12) is connected with the lightning arrester fixing part (11), and the lightning arrester body (1) comprises a first lightning arrester (111);
the capacitor (2) and the lightning arrester fixing part (11) form a parallel circuit, the upper end of the capacitor (2) is connected with a direct-current high-voltage transmission line, and the lower end of the capacitor (2) is connected with the lightning arrester controllable part (12) in series;
the hybrid switch (3) comprises a thyristor valve switch (31) and a hybrid direct current breaker (32), the hybrid switch (3) is connected with a lightning arrester controllable part (12) to form the lower end of a parallel circuit to be grounded, and the other end of the hybrid switch (3) is connected with the lightning arrester fixing part (11).
2. A parallel capacitive dc controllable arrester device according to claim 1, characterized in that: the capacitor (2) and the lightning arrester fixing part (11) form a parallel circuit, the upper end of the capacitor (2) is connected with a direct-current high-voltage transmission line, and the lower end of the capacitor (2) is connected with the lightning arrester controllable part (12) in series.
3. A parallel capacitive dc controllable arrester device according to claim 1, characterized in that: the thyristor valve switch (31) comprises a single thyristor device (312) or a plurality of series-connected thyristor devices (312).
4. A parallel capacitive dc controllable arrester arrangement according to claim 3, characterized in that: the thyristor valve switch (31) comprises a trigger module (311), the trigger module (311) is connected in parallel with the anode, the cathode and the gate of the thyristor device (312), and the trigger module (311) is used for detecting the voltage of two ends which are connected in parallel with the trigger module (311).
5. The parallel capacitive direct current controllable arrester device according to claim 4, characterized in that: and comparing the voltage at two ends of the thyristor device (312) with a preset threshold value, and triggering the thyristor device (312) connected with the thyristor device (312) in parallel to conduct when the voltage at two ends of the thyristor device (312) is greater than the preset threshold value.
6. A parallel capacitive dc controllable arrester device according to claim 1, characterized in that: the switch hybrid direct current breaker (32) comprises a mechanical switch (321), a semiconductor power device (322) and a second lightning arrester (323), wherein the mechanical switch (321), the semiconductor power device (322) and the second lightning arrester (323) are connected in parallel, and the mechanical switch (321) is vacuum or SF 6 And (4) switching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223185566.5U CN218829040U (en) | 2022-11-27 | 2022-11-27 | Parallel capacitance type direct current controllable lightning arrester device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223185566.5U CN218829040U (en) | 2022-11-27 | 2022-11-27 | Parallel capacitance type direct current controllable lightning arrester device |
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| Publication Number | Publication Date |
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| CN218829040U true CN218829040U (en) | 2023-04-07 |
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|---|---|---|---|
| CN202223185566.5U Active CN218829040U (en) | 2022-11-27 | 2022-11-27 | Parallel capacitance type direct current controllable lightning arrester device |
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| CN (1) | CN218829040U (en) |
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- 2022-11-27 CN CN202223185566.5U patent/CN218829040U/en active Active
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