CN109980596B - Mixed current-limiting circuit breaker - Google Patents
Mixed current-limiting circuit breaker Download PDFInfo
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- CN109980596B CN109980596B CN201910185612.5A CN201910185612A CN109980596B CN 109980596 B CN109980596 B CN 109980596B CN 201910185612 A CN201910185612 A CN 201910185612A CN 109980596 B CN109980596 B CN 109980596B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
- H01H9/56—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere for ensuring operation of the switch at a predetermined point in the ac cycle
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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Abstract
The invention discloses a hybrid current-limiting circuit breaker, which comprises a high-speed switch, a fault turn-off circuit, a rated turn-off circuit and an energy-absorbing branch circuit, wherein the fault turn-off circuit provides a rush current for turning off a short-circuit current, the rated turn-off circuit provides a rush current for turning off the rated current, the fault turn-off circuit and the rated turn-off circuit share two diodes which are reversely connected in series, and the fault turn-off circuit and the rated turn-off circuit are respectively connected with the high-speed switch in parallel. Two sets of inductance-capacitance loops with different parameters, namely a fault turn-off circuit and a rated turn-off circuit, are adopted to respectively cope with two working conditions of turning off short-circuit current and turning off rated current, so that the rush current forced for current conversion when the rated current is turned off is reduced, and the electrical service life of the hybrid current-limiting circuit breaker is prolonged.
Description
Technical Field
The present invention relates to current limiting devices, and more particularly, to a hybrid current limiting circuit breaker.
Background
With the increase of the capacity of the power grid, the short-circuit current rise rate and the current peak value are increased increasingly when the power grid has a short-circuit fault, the limit breaking capacity of the traditional mechanical circuit breaker is insufficient, the action time is long, and the requirement of quick current-limiting breaking of the short-circuit fault is difficult to meet. The scheme is a forced current-changing mixed type current-limiting circuit breaker, which utilizes a pulse turn-off circuit connected in parallel with a high-speed mechanical switch to carry out hedging on short-circuit current of a main loop, so that the current of the main loop is reduced and passes zero, and the quick transfer of the current of the mechanical switch is realized.
The hybrid current limiting circuit breaker utilizes a pulse turn-off circuit connected in parallel with a high-speed mechanical switch to carry out hedging on short-circuit current of a main loop, so that the short-circuit current is turned off by the fact that the current of the main loop drops to zero. When the rated current is turned off, the high-amplitude forced off current can generate huge impact on the contact. In view of the practical situation that the probability of occurrence of short-circuit faults is small and conventional opening is relatively large, if the breaker is used for shutting off rated current for a long time, the electrical service life of the breaker cannot be guaranteed due to the reasons.
In view of the above, it is an urgent problem in the art to overcome the above-mentioned drawbacks of the prior art.
Disclosure of Invention
In order to overcome the technical problem that the electrical service life of the circuit breaker cannot be guaranteed when the circuit breaker is used for switching off rated current for a long time in the prior art, the invention provides a hybrid current-limiting circuit breaker aiming at prolonging the electrical service life of the circuit breaker.
In order to achieve the purpose, the invention discloses a hybrid current-limiting circuit breaker which comprises a high-speed switch, a fault turn-off circuit, a rated turn-off circuit and an energy-absorbing branch circuit, wherein the fault turn-off circuit provides a rush current for turning off a short-circuit current, the rated turn-off circuit provides a rush current for turning off the rated current, the fault turn-off circuit, the rated turn-off circuit and the high-speed switch are connected in parallel, and the fault turn-off circuit and the rated turn-off circuit share two diodes which are reversely connected in series.
Further, the fault turn-off circuit comprises two groups of secondary pipe valve branches, a first inductance capacitor and a thyristor valve branch;
the two sets of secondary pipe valve branches comprise: a first branch and a second branch;
the first branch comprises a first diode valve and a second diode valve, the first diode valve and the second diode valve are connected in series in an opposite direction,
the second branch comprises a third diode valve and a fourth diode valve, the third diode valve and the fourth diode valve are connected in series in an opposite direction, the first diode valve and the third diode valve are opposite in direction, the second diode valve and the fourth diode valve are opposite in direction, and the first branch and the second branch are connected in parallel;
the first inductor-capacitor and thyristor valve branch circuit comprises a first thyristor valve, a first inductor and a first capacitor, the first thyristor valve, the first inductor and the first capacitor are connected in series, two ends of the first inductor-capacitor and thyristor valve branch circuit are respectively connected with the first branch circuit and the second branch circuit, a first connection point is located between the first diode valve and the second diode valve, and a second connection point is located between the third diode valve and the fourth diode valve.
Furthermore, the rated turn-off circuit comprises two groups of secondary tube valve branches, a second inductance capacitor and a thyristor valve branch;
the two sets of diode valve branches comprise: a first branch and a third branch;
the first branch comprises a first diode valve and a second diode valve, the first diode valve and the second diode valve are connected in series in an opposite direction,
the third branch comprises a fifth diode valve and a sixth diode valve, the fifth diode valve and the sixth diode valve are connected in series in an opposite direction, the first diode valve and the fifth diode valve are opposite in direction, the second diode valve and the sixth diode valve are opposite in direction, and the first branch and the third branch are connected in parallel;
the second inductor-capacitor and thyristor valve branch circuit comprises a second thyristor valve, a second inductor and a second capacitor, the second thyristor valve, the second inductor and the second capacitor are connected in series, two ends of the second inductor-capacitor and thyristor valve branch circuit are respectively connected with the first branch circuit and the third branch circuit, a first connection point is located between the first diode valve and the second diode valve, and a second connection point is located between the fifth diode valve and the sixth diode valve.
Further, the first inductor-capacitor and thyristor valve branch comprises a first thyristor valve, a first inductor and a first capacitor, and the first thyristor, the first inductor and the first capacitor are connected in series;
the fault shutdown circuit further includes a first return branch including a seventh diode valve, the seventh diode valve being anti-parallel to the first inductance.
Further, the second inductor capacitor and thyristor valve branch comprises a second thyristor valve, a second inductor and a second capacitor, and the second thyristor, the second inductor and the second capacitor are connected in series;
the rated turn-off circuit further comprises a second return branch, the second return branch comprising an eighth diode valve, the eighth diode valve being anti-parallel to the second inductor.
Further, the fault turn-off circuit comprises a group of secondary pipe valve branches, a group of thyristor valve branches and an inductance-capacitance branch;
the set of diode valve branches is a first branch, the first branch comprises a first diode valve and a second diode valve, and the first diode valve and the second diode valve are connected in series in an opposite direction;
the set of thyristor valve branches is a fourth branch comprising a third thyristor valve and a fourth thyristor valve, the third thyristor valve and the fourth thyristor valve are connected in series in an inverted manner, the first diode valve and the third thyristor valve are in opposite directions, and the second diode valve and the fourth thyristor valve are in opposite directions;
the inductance-capacitance branch comprises a first inductance and a first capacitance, the first inductance is connected with the first capacitance in series, two ends of the inductance-capacitance branch are respectively connected with the first branch and the fourth branch, a first connection point is located between the first diode valve and the second diode valve, and a second connection point is located between the third thyristor valve and the fourth thyristor valve.
Further, the thyristor valve is controlled and triggered by a control board.
Furthermore, the energy absorption branch is composed of a piezoresistor, and the capacitor is precharged to a set value.
The technical scheme provided by the invention adopts two sets of inductance-capacitance loops with different parameters, namely the fault turn-off circuit and the rated turn-off circuit, to respectively cope with two working conditions of turning off the short-circuit current and the rated current, so that the rush current forced to be converted when the rated current is turned off is reduced, and the electrical life of the hybrid current-limiting circuit breaker is prolonged. The two sets of inductance-capacitance loops share part of diodes, so that components are reduced, and the circuit structure is simpler; in the two sets of inductance-capacitance loops, proper transformation can be carried out according to actual conditions: a diode is connected in anti-parallel with an inductor in the forced commutation loop, so that the utilization rate of energy in the capacitor is improved; or 2 thyristor valves are used in the fault turn-off circuit to replace the diode valves, the control strategy of the thyristor valves is changed to enable the thyristor valves to be switched on at different moments, a discharge loop can be reduced in the forced commutation process, the medium recovery time after the vacuum contact current in the high-speed switch is subjected to zero crossing is prolonged, and the fault turn-off circuit is beneficial to the electrical life of the high-speed switch.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the apparatus and method consistent with the invention and, together with the detailed description, serve to explain the advantages and principles consistent with the invention. In the drawings:
fig. 1 is a basic circuit topology of a preferred embodiment of a hybrid current limiting circuit breaker of the present invention;
fig. 2 is a first variant circuit topology of a hybrid current limiting circuit breaker;
fig. 3 is a second variant circuit topology of the hybrid current limiting circuit breaker;
fig. 4 is a third variant circuit topology of a hybrid current limiting circuit breaker;
fig. 5 is a fourth variant circuit topology of the hybrid current limiting circuit breaker.
Description of the reference numerals
1-fault shutdown circuit
2-rated turn-off circuit
3-energy absorption branch
MOV-metal oxide varistor
S-high speed switch
D1-first diode valve
D2-second diode valve
D3-third diode valve
D4-fourth diode valve
D5-fifth diode valve
D6-sixth diode valve
D7-seventh diode valve
D8-eighth diode valve
T1-first thyristor valve
T2-second thyristor valve
T3-third thyristor valve
T4-fourth thyristor valve
L1-first inductor
L2-second inductor
C1-first capacitance
C2-second capacitance
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other, and the technical idea of the present invention may be implemented in combination with other known techniques or other techniques identical to those known techniques.
Example one
As shown in fig. 1, the hybrid current-limiting circuit breaker includes a high-speed switch S, a fault shutdown circuit 1, a rated shutdown circuit 2, and an energy-absorbing branch 3, where the energy-absorbing branch 3 is composed of a metal Oxide varistor mov (metal Oxide varistor), the fault shutdown circuit 1 provides a shutdown short-circuit current, the rated shutdown circuit 2 provides a shutdown rated current, the fault shutdown circuit 1, the rated shutdown circuit 2, and the high-speed switch S are connected in parallel, and the fault shutdown circuit 1 and the rated shutdown circuit 2 share two diode valves D1 and D2 connected in series in reverse.
The fault turn-off circuit 1 comprises two groups of secondary tube valve branches, a first inductance capacitor and a thyristor valve branch;
the two sets of two-stage pipe valve branches comprise: a first branch and a second branch;
the first branch includes a first diode valve D1 and a second diode valve D2, a first diode valve D1 and a second diode valve D2 connected in anti-series,
the second branch comprises a third diode valve D3 and a fourth diode valve D4, the third diode valve D3 is connected in series with the fourth diode valve D4 in reverse, the first diode valve D1 is opposite to the third diode valve D3, the second diode valve D2 is opposite to the fourth diode valve D4, and the first branch is connected in parallel with the second branch;
the first inductor capacitor and thyristor valve branch comprises a first thyristor valve T1, a first inductor L1 and a first capacitor C1, the first thyristor valve T1, the first inductor L1 and the first capacitor C1 are connected in series, two ends of the first inductor capacitor and thyristor valve branch are respectively connected with the first branch and the second branch, a first connection point is located between the first diode valve D1 and the second diode valve D2, a second connection point is located between the third diode valve D3 and the fourth diode valve D4, the first thyristor valve T1 is triggered by control of the control board, and the first capacitor C1 is precharged to a set value.
The rated turn-off circuit 2 comprises two groups of secondary tube valve branches, a second inductance capacitor and a thyristor valve branch;
the two sets of diode valve branches comprise: a first branch and a third branch; the first branch comprises a first diode valve D1 and a second diode valve D2, the first diode valve D1 is connected in series with the second diode valve D2 in an opposite direction, the third branch comprises a fifth diode valve D5 and a sixth diode valve D6, the fifth diode valve D5 is connected in series with the sixth diode valve D6 in an opposite direction, the first diode valve D1 is opposite to the fifth diode valve D5, the second diode valve D2 is opposite to the sixth diode valve D6, and the first branch is connected in parallel with the third branch;
the second inductor capacitor and thyristor valve branch comprises a second thyristor valve T2, a second inductor L2 and a second capacitor C2, the second thyristor valve T2, the second inductor L2 and the second capacitor C2 are connected in series, two ends of the second inductor capacitor and thyristor valve branch are respectively connected with the first branch and the third branch, a first connection point is located between the first diode valve D1 and the second diode valve D2, a second connection point is located between the fifth diode valve D5 and the sixth diode valve D6, the second thyristor valve T2 is triggered by control of the control board, and the second capacitor C2 is pre-charged to a set value.
Example two
As shown in fig. 2, 3 and 4, the hybrid current-limiting circuit breaker includes a high-speed switch S, a fault shutdown circuit 1, a rated shutdown circuit 2 and an energy-absorbing branch 3, wherein the energy-absorbing branch 3 is formed by a metal Oxide varistor mov (metal Oxide varistor), the fault shutdown circuit 1 provides a shutdown short-circuit current, the rated shutdown circuit 2 provides a shutdown rated current, the fault shutdown circuit 1, the rated shutdown circuit 2 and the high-speed switch S are connected in parallel, and the fault shutdown circuit 1 and the rated shutdown circuit 2 share two reverse series-connected diode valves D1 and D2.
The fault turn-off circuit 1 comprises two groups of secondary tube valve branches, a first inductance capacitor and a thyristor valve branch;
the two sets of two-stage pipe valve branches comprise: a first branch and a second branch;
the first branch includes a first diode valve D1 and a second diode valve D2, a first diode valve D1 and a second diode valve D2 connected in anti-series,
the second branch comprises a third diode valve D3 and a fourth diode valve D4, the third diode valve D3 is connected in series with the fourth diode valve D4 in reverse, the first diode valve D1 is opposite to the third diode valve D3, the second diode valve D2 is opposite to the fourth diode valve D4, and the first branch is connected in parallel with the second branch;
the first inductor capacitor and thyristor valve branch comprises a first thyristor valve T1, a first inductor L1 and a first capacitor C1, the first thyristor valve T1, the first inductor L1 and the first capacitor C1 are connected in series, two ends of the first inductor capacitor and thyristor valve branch are respectively connected with the first branch and the second branch, a first connection point is located between the first diode valve D1 and the second diode valve D2, a second connection point is located between the third diode valve D3 and the fourth diode valve D4, the first thyristor valve T1 is triggered by control of the control board, and the first capacitor C1 is precharged to a set value.
The rated turn-off circuit 2 comprises two groups of secondary tube valve branches, a second inductance capacitor and a thyristor valve branch;
the two sets of diode valve branches comprise: a first branch and a third branch; the first branch comprises a first diode valve D1 and a second diode valve D2, the first diode valve D1 is connected in series with the second diode valve D2 in an opposite direction, the third branch comprises a fifth diode valve D5 and a sixth diode valve D6, the fifth diode valve D5 is connected in series with the sixth diode valve D6 in an opposite direction, the first diode valve D1 is opposite to the fifth diode valve D5, the second diode valve D2 is opposite to the sixth diode valve D6, and the first branch is connected in parallel with the third branch;
the second inductor capacitor and thyristor valve branch comprises a second thyristor valve T2, a second inductor L2 and a second capacitor C2, the second thyristor valve T2, the second inductor L2 and the second capacitor C2 are connected in series, two ends of the second inductor capacitor and thyristor valve branch are respectively connected with the first branch and the third branch, a first connection point is located between the first diode valve D1 and the second diode valve D2, a second connection point is located between the fifth diode valve D5 and the sixth diode valve D6, the second thyristor valve T2 is triggered by control of the control board, and the second capacitor C2 is pre-charged to a set value.
The fault shutdown circuit 1 further comprises a first return branch which comprises a seventh diode valve D7, the rated shutdown circuit 2 further comprises a second return branch which comprises an eighth diode valve D8, the seventh diode valve D7 is connected in anti-parallel across the first inductance L1, the eighth diode valve D8 is connected in anti-parallel across the second inductance L2, or the seventh diode valve D7 and the eighth diode valve D8 are connected in anti-parallel across the first inductance L1 and the second inductance L2, respectively. Namely, a diode valve is connected in an anti-parallel mode on an inductor in the forced commutation loop, and the utilization rate of energy in the capacitor can be improved.
EXAMPLE III
As shown in fig. 5, the hybrid current-limiting circuit breaker includes a high-speed switch S, a fault shutdown circuit 1, a rated shutdown circuit 2, and an energy-absorbing branch 3, where the energy-absorbing branch 3 is composed of a metal Oxide varistor mov (metal Oxide varistor), the fault shutdown circuit 1 provides a shutdown short-circuit current, the rated shutdown circuit 2 provides a shutdown rated current, the fault shutdown circuit 1, the rated shutdown circuit 2, and the high-speed switch S are connected in parallel, and the fault shutdown circuit 1 and the rated shutdown circuit 2 share two diode valves D1 and D2 connected in series in reverse.
The fault turn-off circuit comprises a group of secondary tube valve branches, a group of thyristor valve branches and an inductance-capacitance branch;
the group of diode valve branches is a first branch which comprises a first diode valve D1 and a second diode valve D2, a first diode valve D1 and a second diode valve D2 are connected in series in an inverted manner, the group of thyristor valve branches is a fourth branch which comprises a third thyristor valve T3 and a fourth thyristor valve T4, a third thyristor valve T3 and a fourth thyristor valve T4 are connected in series in an inverted manner, the first diode valve D1 and the third thyristor valve T3 are in opposite directions, the second diode valve D2 and the fourth thyristor valve T4 are in opposite directions, and the third thyristor valve T3 and the fourth thyristor valve T4 are controlled and triggered by the control board;
the inductance-capacitance branch comprises a first inductance L1 and a first capacitance C1, the first inductance L1 is connected with a first capacitance C1 in series, two ends of the inductance-capacitance branch are respectively connected with the first branch and a third branch, a first connection point is located between a first diode valve D1 and a second diode valve D2, a second connection point is located between a third thyristor valve T3 and a fourth thyristor valve T4, and the first capacitance C1 is pre-charged to a set value.
The rated turn-off circuit 2 comprises two groups of secondary tube valve branches, a second inductance capacitor and a thyristor valve branch;
the two sets of diode valve branches comprise: a first branch and a third branch; the first branch comprises a first diode valve D1 and a second diode valve D2, the first diode valve D1 is connected in series with the second diode valve D2 in an opposite direction, the third branch comprises a fifth diode valve D5 and a sixth diode valve D6, the fifth diode valve D5 is connected in series with the sixth diode valve D6 in an opposite direction, the first diode valve D1 is opposite to the fifth diode valve D5, the second diode valve D2 is opposite to the sixth diode valve D6, and the first branch is connected in parallel with the third branch;
the second inductor capacitor and thyristor valve branch comprises a second thyristor valve T2, a second inductor L2 and a second capacitor C2, the second thyristor valve T2, the second inductor L2 and the second capacitor C2 are connected in series, two ends of the second inductor capacitor and thyristor valve branch are respectively connected with the first branch and the third branch, a first connection point is located between the first diode valve D1 and the second diode valve D2, a second connection point is located between the fifth diode valve D5 and the sixth diode valve D6, the second thyristor valve T2 is triggered by control of the control board, and the second capacitor C2 is pre-charged to a set value.
2 thyristor valves are used to replace diode valves in the fault turn-off circuit, the control strategy of the thyristor valves is changed to enable the thyristor valves to be turned on at different moments, a discharge loop can be reduced in the forced commutation process, the medium recovery time after the vacuum contact current in the high-speed switch S is subjected to zero crossing is prolonged, and the electrical service life of the high-speed switch is prolonged.
Compared with the prior art, the hybrid current-limiting circuit breaker provided by the invention has the following advantages: firstly, two sets of inductance-capacitance loops with different parameters, namely a fault turn-off circuit and a rated turn-off circuit, are adopted to respectively cope with two working conditions of turning off short-circuit current and turning off rated current, so that the rush current forced for current conversion when the rated current is turned off is reduced, and the electrical service life of the hybrid current-limiting circuit breaker is prolonged; secondly, the two sets of inductance-capacitance loops share part of diodes, so that components are reduced, and the circuit structure is simpler; thirdly, the two sets of inductance-capacitance loops can be properly converted according to actual conditions: a diode is connected in anti-parallel with an inductor in the forced commutation loop, so that the utilization rate of energy in the capacitor is improved; or 2 thyristor valves are used in the fault turn-off circuit to replace the diode valves, the control strategy of the thyristor valves is changed to enable the thyristor valves to be switched on at different moments, a discharge loop can be reduced in the forced commutation process, the medium recovery time after the vacuum contact current in the high-speed switch is subjected to zero crossing is prolonged, and the fault turn-off circuit is beneficial to the electrical life of the high-speed switch.
The terms "first" and "second" as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another, unless otherwise specified. Similarly, modifiers similar to "about", "approximately" or "approximately" that occur before a numerical term herein typically include the same number, and their specific meaning should be read in conjunction with the context. Similarly, unless a specific number of a claim recitation is intended to cover both the singular and the plural, and also that claim may include both the singular and the plural.
In the description of the specific embodiments above, the use of the directional terms "upper", "lower", "left", "right", "top", "bottom", "vertical", "transverse", and "lateral", etc., are for convenience of description only and should not be considered limiting.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (5)
1. A hybrid current-limiting circuit breaker is characterized by comprising a high-speed switch, a fault turn-off circuit, a rated turn-off circuit and an energy absorption branch circuit, wherein the fault turn-off circuit provides a rush current for turning off a short-circuit current, the rated turn-off circuit provides a rush current for turning off the rated current, the fault turn-off circuit, the rated turn-off circuit and the high-speed switch are connected in parallel, and the fault turn-off circuit and the rated turn-off circuit share two diodes which are reversely connected in series; the fault turn-off circuit and the rated turn-off circuit have inductance-capacitance loops with different parameters;
the rated turn-off circuit comprises two groups of diode valve branches, a second inductance capacitor and a thyristor valve branch;
the two sets of diode valve branches comprise: a first branch and a third branch;
the first branch comprises a first diode valve and a second diode valve, the first diode valve and the second diode valve are connected in series in an opposite direction, the third branch comprises a fifth diode valve and a sixth diode valve, the fifth diode valve and the sixth diode valve are connected in series in an opposite direction, the first diode valve and the fifth diode valve are opposite in direction, the second diode valve and the sixth diode valve are opposite in direction, and the first branch and the third branch are connected in parallel;
the second inductor-capacitor and thyristor valve branch comprises a second thyristor valve, a second inductor and a second capacitor, the second thyristor valve, the second inductor and the second capacitor are connected in series, two ends of the second inductor-capacitor and thyristor valve branch are respectively connected with the first branch and the third branch, a first connection point is positioned between the first diode valve and the second diode valve, and a second connection point is positioned between the fifth diode valve and the sixth diode valve;
the fault turn-off circuit comprises two groups of diode valve branches, a first inductance capacitor and a thyristor valve branch;
the two sets of diode valve branches comprise: a first branch and a second branch;
the first branch comprises a first diode valve and a second diode valve, the first diode valve and the second diode valve are connected in series in an opposite direction, the second branch comprises a third diode valve and a fourth diode valve, the third diode valve and the fourth diode valve are connected in series in an opposite direction, the first diode valve and the third diode valve are opposite in direction, the second diode valve and the fourth diode valve are opposite in direction, and the first branch and the second branch are connected in parallel;
the first inductor-capacitor and thyristor valve branch comprises a first thyristor valve, a first inductor and a first capacitor, the first thyristor valve, the first inductor and the first capacitor are connected in series, two ends of the first inductor-capacitor and thyristor valve branch are respectively connected with the first branch and the second branch, a first connection point is positioned between the first diode valve and the second diode valve, and a second connection point is positioned between the third diode valve and the fourth diode valve;
or
The fault turn-off circuit comprises a group of diode valve branches, a group of thyristor valve branches and an inductance-capacitance branch; the set of diode valve branches is a first branch, the first branch comprises a first diode valve and a second diode valve, and the first diode valve and the second diode valve are connected in series in an opposite direction;
the set of thyristor valve branches is a fourth branch comprising a third thyristor valve and a fourth thyristor valve, the third thyristor valve and the fourth thyristor valve are connected in series in an inverted manner, the first diode valve and the third thyristor valve are in opposite directions, and the second diode valve and the fourth thyristor valve are in opposite directions; the inductance-capacitance branch comprises a first inductance and a first capacitance, the first inductance is connected with the first capacitance in series, two ends of the inductance-capacitance branch are respectively connected with the first branch and the fourth branch, a first connection point is located between the first diode valve and the second diode valve, and a second connection point is located between the third thyristor valve and the fourth thyristor valve.
2. The hybrid current-limiting circuit breaker of claim 1 wherein the first inductive capacitor and thyristor valve branch comprises a first thyristor valve, a first inductance, and a first capacitance, the first thyristor, the first inductance, and the first capacitance being connected in series;
the fault shutdown circuit also includes a first return leg including a seventh diode valve, the seventh diode valve being anti-parallel to the first inductor.
3. The hybrid current limiting circuit breaker of claim 1, wherein the second inductive capacitor and thyristor valve branch comprises a second thyristor valve, a second inductor and a second capacitor, the second thyristor, the second inductor and the second capacitor being connected in series;
the rated turn-off circuit further comprises a second return branch, the second return branch comprising an eighth diode valve, the eighth diode valve being anti-parallel to the second inductor.
4. The hybrid current limiting circuit breaker of any one of claims 1 to 3, wherein the thyristor valve is controlled to be triggered by a control board.
5. The hybrid current-limiting circuit breaker of claim 1, wherein the energy absorption branch is formed of a varistor and the capacitor is precharged to a set value.
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| CN201910185612.5A CN109980596B (en) | 2019-03-12 | 2019-03-12 | Mixed current-limiting circuit breaker |
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| CN201910185612.5A CN109980596B (en) | 2019-03-12 | 2019-03-12 | Mixed current-limiting circuit breaker |
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| CN109980596B true CN109980596B (en) | 2022-02-15 |
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| CN106849327A (en) * | 2017-01-19 | 2017-06-13 | 上海电气集团股份有限公司 | The breaker and control method of a kind of alternating current-direct current hybrid |
| CN107039952A (en) * | 2017-02-09 | 2017-08-11 | 上海电气集团股份有限公司 | The breaker and control method of a kind of alternating current-direct current hybrid |
| CN109066606A (en) * | 2018-07-12 | 2018-12-21 | 武汉杭久电气有限公司 | A kind of two-way forced commutation type direct current current-limiting circuit breaker |
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2019
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849327A (en) * | 2017-01-19 | 2017-06-13 | 上海电气集团股份有限公司 | The breaker and control method of a kind of alternating current-direct current hybrid |
| CN107039952A (en) * | 2017-02-09 | 2017-08-11 | 上海电气集团股份有限公司 | The breaker and control method of a kind of alternating current-direct current hybrid |
| CN109066606A (en) * | 2018-07-12 | 2018-12-21 | 武汉杭久电气有限公司 | A kind of two-way forced commutation type direct current current-limiting circuit breaker |
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