CN115980558A - Synthetic test loop - Google Patents
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- CN115980558A CN115980558A CN202111198150.4A CN202111198150A CN115980558A CN 115980558 A CN115980558 A CN 115980558A CN 202111198150 A CN202111198150 A CN 202111198150A CN 115980558 A CN115980558 A CN 115980558A
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Abstract
The invention provides a synthetic test loop, which is used for realizing the detection of the breaking performance of a direct current breaker, wherein in the synthetic test loop, one end of the output end of a current source is respectively connected with one end of the direct current breaker and one end of the input end of a voltage source; the other end of the direct current breaker, the other end of the output end of the current source and the other end of the input end of the voltage source are all grounded; the current source comprises a power generation unit; namely, the power generation unit provides short-circuit on-off current for the direct-current circuit breaker, can provide absorption energy which accords with the actual operation working condition for the energy consumption branch lightning arrester of the direct-current circuit breaker, and meets the requirement of the current on-off test of the direct-current circuit breaker on the capacity of a test power supply; correct transient on-off voltage and direct current recovery voltage can be applied to the direct current breaker; therefore, the synthetic test loop can correctly simulate the actual operation condition of the circuit breaker in the system, the test parameters meet the technical specification and requirements of the circuit breaker, and correct energy can be applied to the lightning arrester in the energy consumption branch of the direct current circuit breaker.
Description
Technical Field
The invention belongs to the technical field of direct-current distribution network direct-current breaker tests, and particularly relates to a synthesis test loop.
Background
The application demand of China on medium voltage direct current power grids is wide, urban direct current power grids can be applied to urban rail transit, industrial parks, large data centers, ship integrated power systems and the like, and the demand of distributed clean energy economic access and future medium voltage direct current-based energy Internet is gradually developed. The medium-voltage direct-current power distribution system has outstanding advantages in the aspects of improving the reliability of a power grid, improving the energy utilization efficiency and improving the power quality, can effectively improve the power quality, reduce the power loss and the operation cost, coordinate contradictions between a large power grid and a distributed power supply, and fully exert the value and benefit of distributed energy.
The direct current breaker is used as a vital control and protection element in a direct current distribution system and is used for ensuring the safe operation of the system. The circuit breaker can be opened, closed and bear normal current of an operation line, and can also bear, close and open specified short-circuit current within specified time. In order to assess the performance of the direct current circuit breaker and ensure the operation reliability of the direct current circuit breaker, necessary test modes and test methods are required to be adopted to assess the direct current circuit breaker. The main purpose of the examination is to verify that the direct current breaker can reliably act under any condition of the direct current system.
The direct current breaker test project is divided into four parts of an insulation test, an operation test, a mechanical temperature rise test and an electromagnetic compatibility test, and compared with other tests, the operation test is the most difficult. At present, the breaking capacity of the direct current circuit breaker is mainly verified through a high-capacity test, so that equipment and test technology of a high-capacity laboratory are particularly important. The test for detecting the short-circuit current breaking performance of the direct-current circuit breaker is the most important test item of the operation test.
At present, a laboratory generally adopts a test loop with an oscillating loop as a power supply to perform a direct current breaker on-off test. The LC oscillating circuit generates required switching-on and switching-off current, and different switching-on and switching-off currents are generated by changing the capacitor pre-charging voltage and the inductor. After the direct current breaker cuts off the current, the recovery voltage is determined by the energy consumption branch circuit of the direct current breaker and the oscillating voltage of the LC oscillating circuit and the circuit transferred by the direct current breaker. The LC oscillating circuit comprises an LC oscillating power supply, an ignition ball gap, an auxiliary switch, a tested direct current breaker and a current and voltage measuring system. The schematic diagram of the dc breaker open test with the tank circuit as the power supply is shown in fig. 1.
The capacity of a laboratory oscillation circuit power supply is limited, so that the energy absorption of an arrester of a breaker energy consumption branch cannot be effectively checked, the recovery voltage applied after the breaker is disconnected does not accord with the actual operation condition of the direct-current breaker in a direct-current system, and the check is incomplete.
Disclosure of Invention
In view of this, the present invention provides a synthetic test loop for correctly simulating an actual operation condition of a circuit breaker in a system, where test parameters meet technical specifications and requirements of the circuit breaker.
The invention discloses a synthetic test loop for detecting the breaking performance of a direct current breaker, which comprises the following parts: a current source and a voltage source;
one end of the output end of the current source is connected with one end of the direct current breaker and one end of the input end of the voltage source respectively through an auxiliary switch; the current source comprises a power generation unit;
the other end of the direct current circuit breaker, the other end of the output end of the current source and the other end of the input end of the voltage source are all grounded.
Optionally, the current source includes: the power generation device comprises a power generation unit, a protection switch, a closing switch, a first reactor and a transformer;
the power generation unit is connected with a low-voltage winding of the transformer in parallel through the protection switch, the closing switch and the first reactor; and two ends of a high-voltage winding of the transformer are used as two ends of the output end of the current source.
Optionally, the power generation unit includes: at least one short-circuit generator.
Optionally, one end of the protection switch is connected to one end of the power generation unit;
the other end of the protection switch is connected with one end of the closing switch;
the other end of the closing switch is connected with one end of the inductor;
the other end of the inductor is connected with one end of a low-voltage winding of the transformer;
and the other end of the low-voltage winding is connected with the other end of the power generation unit.
Optionally, the voltage source includes: the pre-charging device comprises a pre-charging capacitor, a resistor, a switching-on device and a second reactor;
one end of the pre-charging capacitor is connected with the auxiliary switch and the direct-current circuit breaker respectively through the resistor, the switch-on device and the second reactor;
the other end of the pre-charge capacitor is grounded.
Optionally, one end of the pre-charge capacitor is connected to the auxiliary switch and the dc circuit breaker sequentially through the resistor, the second reactor, and the switch-on device.
Optionally, the method further includes: a protection system;
the protection system is used for protecting the current passing through the direct current circuit breaker, so that the direct current circuit breaker is protected.
Optionally, the protection system includes: overcurrent protection devices and measurement systems;
one end of the overcurrent protection device is connected with a connection point between the auxiliary switch and the current source; the other end of the overcurrent protection device is grounded;
the measuring system is used for triggering the overcurrent protection device to execute protection actions.
Optionally, the measuring system is configured to measure the current of the current source, the current of the dc breaker, and the recovery voltage of the dc breaker.
Optionally, the measurement system includes: a first current sensor, a second current sensor and a voltage sensor;
the first current sensor is used for measuring the current of the current source;
the second current sensor is used for measuring the on-off current of the direct current breaker;
the voltage sensor is used for measuring the recovery voltage of the direct current breaker.
According to the technical scheme, the synthesis test loop provided by the invention is used for realizing the detection of the breaking performance of the direct current circuit breaker, and comprises the following components: a current source and a voltage source; one end of the output end of the current source is respectively connected with one end of the direct current breaker and one end of the input end of the voltage source; the current source comprises a power generation unit; the other end of the direct current breaker, the other end of the output end of the current source and the other end of the input end of the voltage source are all grounded; that is to say, the power generation unit in the current source provides short-circuit on-off current for the direct current breaker, and after the direct current breaker is switched off, the power generation unit can provide absorption energy which accords with the actual operation working condition for the energy dissipation branch arrester of the direct current breaker, so that the requirement of the current on-off test of the direct current breaker on the capacity of the test power supply is met; correct transient on-off voltage and direct current recovery voltage can be applied to the direct current breaker; therefore, the synthetic test loop can correctly simulate the actual operation working condition of the circuit breaker in the system, the test parameters meet the technical specification and requirements of the circuit breaker, correct energy can be applied to the lightning arrester in the energy consumption branch of the direct current circuit breaker, and recovery voltage meeting the actual working condition is provided for the circuit breaker.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art oscillating circuit for performing a DC breaker open/close test on a power supply;
FIG. 2 is a schematic diagram of a synthesis test circuit according to an embodiment of the present invention;
fig. 3-fig. 6 are timing diagrams of current changes of respective branches in a dc circuit breaker according to an embodiment of the present invention;
FIG. 7 is a diagram of a current waveform of a protection system in a synthetic experiment circuit according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of another synthetic trial circuit provided by embodiments of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
It should be noted that, the dc circuit breaker currently has the following: solid-state dc circuit breakers, hybrid dc circuit breakers, mechanical dc circuit breakers. At present, a hybrid direct current circuit breaker is widely adopted, and the hybrid direct current circuit breaker consists of 3 parallel branches, namely a main branch, an energy consumption branch and a transfer branch. The main branch is composed of a mechanical switch to bear rated current and quickly establish an insulation gap when the system is switched off, the energy dissipation branch is composed of an arrester MOV and used for limiting switching overvoltage and absorbing switching-off energy stored in the system, and the transfer branch is composed of a plurality of power electronic devices connected in series and mainly used for quickly switching off and transferring current.
The direct current breaker disconnection test loop with the oscillation loop as the power supply in the prior art cannot effectively check the energy absorbed by the lightning arrester of the breaker energy consumption branch because the power supply capacity of the oscillation loop in a laboratory is limited, so that the recovery voltage applied after the breaker is disconnected does not accord with the actual operation condition of the direct current breaker in a direct current system, and the check is not comprehensive.
Based on the above, the invention provides a synthetic test loop, which is used for realizing the detection of the breaking performance of a direct current breaker and solving the problems that the absorbed energy of a lightning arrester of an energy consumption branch of the breaker cannot be effectively checked in the prior art, so that the recovery voltage applied after the breaker is broken does not accord with the actual operation condition of the direct current breaker in a direct current system, and the checking is incomplete.
When the circuit has short-circuit fault, the direct current breaker is used for breaking the fault circuit, cutting off the short-circuit fault and ensuring the safety of the system. The cut-off current is the current in the circuit is cut off, and the current is from dozens of kiloamperes to zero.
As shown in fig. 2, the synthetic test loop comprises: a current source 10 and a voltage source 20.
One end of the output end of the current source 10 is connected with one end of the direct current breaker To and one end of the input end of the voltage source 20 through the auxiliary switch FK respectively; the current source 10 includes a power generating unit (including G as shown in fig. 2).
The current source 10 provides a short-circuit breaking current for the dc breaker To; that is, after the dc circuit breaker To is turned on and off, the power generating unit in the current source 10 can provide the absorbed energy meeting the actual operating condition for the lightning arrester in the energy consumption branch of the dc circuit breaker To, meet the requirement of the current turn-off test of the dc circuit breaker To on the capacity of the test power supply, and apply correct transient turn-off voltage and dc recovery voltage To the dc circuit breaker To.
Of course, other devices may be included in the current source 10, and details are not described herein and are within the scope of the present application.
Specifically, the output terminal of the current source 10 is connected to one terminal of the auxiliary switch FK; the other end of the auxiliary switch FK is connected To one end of the dc breaker To and one end of the input terminal of the voltage source 20, respectively.
The other end of the dc circuit breaker To, the other end of the output terminal of the current source 10 and the other end of the input terminal of the voltage source 20 are all grounded.
In this embodiment, the synthetic test loop can correctly simulate the actual operation condition of the dc circuit breaker To in the system, the test parameters meet the technical specification and requirements of the circuit breaker, correct energy can be applied To the lightning arrester in the energy consumption branch of the dc circuit breaker To, and the recovery voltage meeting the actual condition is provided for the circuit breaker.
In practical applications, as shown in fig. 2, the current source 10 includes: the power generation device comprises a power generation unit, a protection switch BK, a closing switch HK, a first reactor L1 and a transformer T.
The power generation unit is connected with a low-voltage winding of the transformer T in parallel through a protection switch BK, a closing switch HK and a first reactor L1; the two ends of the high-voltage winding of the transformer T are used as the two ends of the output end of the current source 10.
In practical applications, the sequence among the protection switch BK, the closing switch HK and the first reactor L1 is not specifically limited herein, and all of them are within the protection scope of the present application, depending on practical situations.
Specifically, the sequence among the protection switch BK, the closing switch HK, and the first reactor L1 is exemplified by:
a protection switch BK, a closing switch HK and a first reactor L1 are sequentially provided between the power generation unit and the transformer T.
One end of the protection switch BK is connected with one end of the power generation unit; the other end of the protection switch BK is connected with one end of a closing switch HK; the other end of the closing switch HK is connected with one end of the inductor; the other end of the inductor is connected with one end of a low-voltage winding of the transformer T; the other end of the low-voltage winding is connected with the other end of the power generation unit.
In practical applications, as shown in fig. 2, the power generation unit includes: at least one short-circuiting generator G.
That is, the number of the short-circuit generators G in the power generation unit may be 1, or may be at least two, and is not specifically limited herein, and all that is required is within the protection scope of the present application.
Specifically, when the number of the short-circuit generators G is 1, both ends of the short-circuit generators G serve as both ends of the power generation unit. When the number of the short-circuit generators G is at least two, both ends of each short-circuit generator G after series-parallel connection are used as both ends of the power generation unit. The connection relationship between the short-circuit generators G is not specifically limited herein, and may be determined according to actual conditions, and is within the protection scope of the present application.
The generator G in the power generation unit may not be the short-circuit generator G, and is not particularly limited herein, and may be within the protection scope of the present application as appropriate.
Specifically, generator G in this power generation unit needs To match with the type of dc breaker To, also can simulate the condition of dc breaker To system, if when dc breaker To is medium voltage dc breaker To, this generator G is short circuit generator G, and this here is no longer repeated one by one, all is in the protection scope of this application. The short circuit generator G is different from the power plant generator, which generally operates under normal operating conditions. The laboratory short-circuit generator G operates in a short-circuit situation, the short-circuit current being typically 10 times greater than the rated current.
Specifically, one or two short-circuit generators G are connected in parallel, the direct-current short-circuit current is simulated by the first milliseconds of the half-wave of the alternating current at a lower frequency, and the current rise rate and the breaking energy required by the test are met by adjusting a first reactor L1 on the low-voltage side of the loop. After the tested direct current breaker To cuts off the short-circuit current, the low-frequency generator G system provides transient cut-off voltage for the breaker; when the recovery voltage reaches the action voltage of the energy-consuming branch lightning arrester of the direct-current circuit breaker To, the lightning arrester acts, and the recovery voltage is limited To the residual voltage of the lightning arrester. Before the short-circuit current is cut off, the voltage source 20 is turned on To supply a DC recovery voltage (DC recovery voltage) after the current is cut off To the DC breaker To. During the switching-off of the current of the dc circuit breaker To, the auxiliary switch FK is switched off at the same time, and at the zero crossing of the short-circuit current, the auxiliary switch FK is switched off, so that the current source 10 is isolated from the voltage source 20. And after the internal disconnecting switch of the direct current circuit breaker To cuts off the residual current, completing a short-circuit current cut-off test. The current is determined by the output voltage of the first reactor L1 and the generator G. After the three branches in the dc circuit breaker To are switched on and off, because the inside of the circuit breaker is connected in parallel with a capacitor and a resistor R, a small residual current exists, and the disconnecting switch is used for switching on and off the residual current.
It should be noted that the dc circuit breaker To is composed of a main branch, a transfer branch and an energy consumption branch. Short-circuit current firstly flows through the main branch circuit, receives a switching-off command, the main branch circuit mechanical breaker is switched off, then power electronic devices in the transfer branch circuit are switched on, the current is transferred To the transfer branch circuit, then the transfer branch circuit is switched off, the voltage rapidly rises, an arrester in the energy consumption branch circuit acts, the current is transferred To the arrester branch circuit, and when the current of the arrester is zero, the voltage on the direct-current breaker To is the direct-current voltage of a system where the direct-current breaker To is located. During the test, the voltage source 20 is put in before the current of the arrester is zero, and after the current of the arrester is zero, the direct current voltage of the voltage source 20 is applied To the direct current breaker To. The current is injected before zero in order to make the recovery voltage of the breaker smoothly transited. That is, the current variation timing of each branch is as shown in fig. 3-6.
In practical applications, as shown in fig. 2, the voltage source 20 includes: a pre-charge capacitor C, a resistor R, a switch-on device K and a second reactor L2.
One end of the pre-charging capacitor C is respectively connected with the auxiliary switch FK and the direct-current breaker through a resistor R, a switch-on device K and a second reactor L2; the other end of the pre-charge capacitor C is grounded.
In practical applications, the sequence among the resistor R, the switch-on device K, and the second reactor L2 is not specifically limited here, and all of them are within the protection scope of the present application, depending on practical situations.
Next, the sequence among the resistor R, the turn-on device K, and the second reactor L2 will be described as an example:
one end of the pre-charging capacitor C is connected to the auxiliary switch FK and the dc breaker, respectively, sequentially via the resistor R, the second reactor L2 and the switch-on device K.
Specifically, one end of the precharge capacitor C is connected to one end of a resistor R, the other end of the resistor R is connected to one end of a second reactor L2, the other end of the second reactor L2 is connected to one end of a switch-on device K, and the other end of the switch-on device K is connected to an auxiliary switch FK and a dc circuit breaker, respectively.
If the dc breaker To be tested does not switch off the current at the desired moment, but the ac current can only be extinguished at the current zero point, the following ac half-wave will cause an unacceptable hazard To the dc breaker To. To avoid this, a protection system is used on the high-voltage side of the transformer T.
That is, the synthesis test loop may further include: and (4) protecting the system.
The protection system is used for protecting the current passing through the direct current breaker To, thereby playing a role in protecting the direct current breaker To.
In any of the above embodiments, the protection system may comprise: an overcurrent protection device DK and a measurement system.
One end of an overcurrent protection device DK is connected to a connection point between the auxiliary switch FK and the current source 10; the other end of the over-current protection device DK is grounded.
The measurement system is used for triggering an overcurrent protection device DK to execute protection actions.
Specifically, when the dc circuit breaker To is not disconnected, the overcurrent protection device DK is triggered To bypass the current, so as To prevent overload damage To the dc circuit breaker To.
The measuring system is used To measure the current of the current source 10, the current of the dc breaker To, and the recovery voltage of the dc breaker To.
Specifically, the measurement system includes: a first current sensor I1, a second current sensor I2 and a voltage sensor V.
A first current sensor I1 for measuring the current of the current source 10; specifically, the first current sensor I1 is disposed between the current source 10 and the auxiliary switch FK.
The second current sensor I2 is used for measuring the on-off current of the direct current breaker To; specifically, the second current sensor I2 is disposed between the dc breaker To and the ground.
A voltage sensor V for measuring the recovery voltage of the dc breaker To; specifically, one end of the voltage sensor V is connected To a connection point between the dc breaker To and the auxiliary switch FK, and the other end of the voltage sensor V is grounded.
Specifically, in the protection system that comprises real-time current sensor, auxiliary switch FK and overcurrent protection device DK, its overcurrent protection device DK is controlled by real-time current sensor, in case the electric current exceeds preset value, current sensor can send protection signal To overcurrent protection device DK at once, and overcurrent protection device DK moves fast, and the bypass passes through the electric current of direct current circuit breaker To play the effect of protection direct current circuit breaker To. Fig. 7 is a current waveform diagram when the protection system operates.
In this embodiment, the synthetic test loop has a current overload protection function, and when the tested dc circuit breaker To fails To open and the synthetic test system detects that the test current exceeds the open/close current value of the dc circuit breaker To, the synthetic test system immediately sends a protection command To the overcurrent protection device DK connected in parallel with the dc circuit breaker To, so that the current is transferred To the protection device branch, thereby playing a role in protecting the dc circuit breaker To.
It should be noted that, a direct current power supply test loop can be adopted to simulate the actual operation condition of the direct current system, the test loop has the highest equivalence, and the defects are that the capacity of the required direct current power supply is very large, and all laboratories at home and abroad do not have such a large direct current power supply. The working principle diagram is shown in figure 8.Udc is a direct current power supply; l is a reactor; FK is an auxiliary switch; to is the DC breaker To be tested.
The direct current power supply is a direct current power supply with very large capacity, and because a laboratory does not have the direct current power supply with the large capacity, an oscillating circuit is used for replacing a direct current system power supply in the prior art. Fig. 8 is a large-capacity dc power supply, and if a laboratory has a dc power supply as large as the actual dc system of the power grid, the detection of the circuit breaker opening performance can also be accomplished.
Features described in the embodiments in the present specification may be replaced or combined with each other, and the same and similar portions among the embodiments may be referred to each other, and each embodiment is described with emphasis on differences from other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement without inventive effort.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components and steps of the various examples have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A synthetic test loop for detecting the breaking performance of a DC circuit breaker, comprising: a current source and a voltage source;
one end of the output end of the current source is connected with one end of the direct current breaker and one end of the input end of the voltage source respectively through an auxiliary switch; the current source comprises a power generation unit;
the other end of the direct current breaker, the other end of the output end of the current source and the other end of the input end of the voltage source are all grounded.
2. The synthetic test loop of claim 1 wherein the current source comprises: the power generation device comprises a power generation unit, a protection switch, a closing switch, a first reactor and a transformer;
the power generation unit is connected with a low-voltage winding of the transformer in parallel through the protection switch, the closing switch and the first reactor; and two ends of a high-voltage winding of the transformer are used as two ends of the output end of the current source.
3. The synthetic test loop of claim 2 wherein the power generation unit comprises: at least one short-circuit generator.
4. The synthetic test loop of claim 2 wherein one end of the protection switch is connected to one end of the power generation unit;
the other end of the protection switch is connected with one end of the closing switch;
the other end of the closing switch is connected with one end of the inductor;
the other end of the inductor is connected with one end of a low-voltage winding of the transformer;
and the other end of the low-voltage winding is connected with the other end of the power generation unit.
5. The synthetic test loop of claim 1 wherein the voltage source comprises: the pre-charging device comprises a pre-charging capacitor, a resistor, a switching-on device and a second reactor;
one end of the pre-charging capacitor is connected with the auxiliary switch and the direct-current circuit breaker respectively through the resistor, the switch-on device and the second reactor;
the other end of the pre-charge capacitor is grounded.
6. The synthetic test loop of claim 5 wherein one end of the pre-charge capacitor is connected to the auxiliary switch and the dc breaker, respectively, sequentially through the resistor, the second reactor, and the switch-on device.
7. The synthetic test loop of any one of claims 1-6 further comprising: a protection system;
the protection system is used for protecting the current passing through the direct current circuit breaker, so that the direct current circuit breaker is protected.
8. The synthetic test loop of claim 7 wherein the protection system comprises: overcurrent protection devices and measurement systems;
one end of the overcurrent protection device is connected with a connection point between the auxiliary switch and the current source; the other end of the overcurrent protection device is grounded;
the measuring system is used for triggering the overcurrent protection device to execute protection actions.
9. The synthetic test loop of claim 7 wherein the measurement system is configured to measure the current of the current source, the current of the dc breaker, and the recovery voltage of the dc breaker.
10. The synthetic test loop of claim 9 wherein the measurement system comprises: a first current sensor, a second current sensor and a voltage sensor;
the first current sensor is used for measuring the current of the current source;
the second current sensor is used for measuring the on-off current of the direct current breaker;
the voltage sensor is used for measuring the recovery voltage of the direct current breaker.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117192354A (en) * | 2023-11-01 | 2023-12-08 | 华北电力科学研究院有限责任公司 | Hybrid high-voltage direct-current breaker test loop, method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117192354A (en) * | 2023-11-01 | 2023-12-08 | 华北电力科学研究院有限责任公司 | Hybrid high-voltage direct-current breaker test loop, method and device |
| CN117192354B (en) * | 2023-11-01 | 2024-01-23 | 华北电力科学研究院有限责任公司 | Hybrid high-voltage direct-current breaker test loop, method and device |
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