CN216792391U - Breaking capacity detection system of auxiliary contact of high-voltage switch equipment - Google Patents
Breaking capacity detection system of auxiliary contact of high-voltage switch equipment Download PDFInfo
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- CN216792391U CN216792391U CN202220233175.7U CN202220233175U CN216792391U CN 216792391 U CN216792391 U CN 216792391U CN 202220233175 U CN202220233175 U CN 202220233175U CN 216792391 U CN216792391 U CN 216792391U
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Abstract
The utility model provides a system for detecting the breaking capacity of an auxiliary contact of high-voltage switch equipment, wherein a breaking capacity test loop comprises a main shaft control mechanism, an auxiliary switch state detection loop, a test loop, a closing power supply loop, an opening power supply loop, an energy storage power supply loop and a driving switch assembly; the auxiliary switch state detection circuit and the test circuit are respectively provided with a plurality of auxiliary switches and auxiliary contacts, the auxiliary switches are all connected with the driving switch assembly, the auxiliary contacts are in control connection through the auxiliary switches, the switch-on power supply circuit, the switch-off power supply circuit and the switch of the energy storage power supply are controlled through the test circuit, the switch-on power supply circuit, the switch-off power supply circuit and the energy storage power supply circuit respectively drive the driving switch assembly of the main shaft control mechanism to carry out switch-on or switch-off operation and energy storage operation on the auxiliary switches, the opening and closing test of the auxiliary contacts is realized, and meanwhile, the auxiliary switch state detection circuit is also provided with an auxiliary switch state detection circuit module.
Description
Technical Field
The utility model relates to the technical field of high-voltage switch equipment, in particular to a system for detecting the breaking capacity of an auxiliary contact of the high-voltage switch equipment.
Background
The demand of power grid construction on high-voltage switch products is increased, whether the electrical performance and the mechanical performance of the products can stably guarantee the safe and reliable operation of a power system for a long time or not needs to be fully checked and verified by using tests before commissioning. The auxiliary switch is an important part of the auxiliary and control circuit of the high-voltage switch equipment, is configured in the electric equipment such as a high-voltage or medium-voltage circuit breaker, an isolating switch and the like to serve as the opening, closing, signal control and interlocking protection functions of a secondary control circuit, and can also serve as a combined switch and a change-over switch. The auxiliary switch is a part of the main switch, and two words of 'auxiliary' in the auxiliary switch represent that the auxiliary switch is not an independent switch and is a carrier for realizing auxiliary functions of breaking, connecting and interlocking in a control system. In the operation process of the high-voltage switch, the auxiliary switch needs to cut off the opening and closing currents of the secondary control loop, so that the cutting-off capacity of the auxiliary contact needs to be fully verified. The test requirements of the breaking capability of the auxiliary contact of GB/T11022-2020 shared technical requirements of standards of high-voltage alternating-current switchgear and control equipment 7.10.3.4 specify how the breaking capability of the auxiliary contact can be verified. The standard is divided into two grades according to voltage grades, namely, the voltage grade is less than or equal to 48V, the voltage grade is less than or equal to 110V, the voltage grade is less than or equal to U _ a is less than or equal to 250V, and meanwhile, according to the classification of the common secondary control voltage in China at present, the rated voltage in the actual test is four test voltages of 24V, 48V, 110V and 220V. The 24V and 48V belong to 48V, the switching-off current is 50mA for the voltage class, the 110V and 220V belong to 110V U _ a 250V, and according to the contact classification, 440W needs to be switched off when the contact is in the 1 level and 22W needs to be switched off when the contact is in the 2 level. All the break test loop time constants need to be satisfied for not less than 20 ms.
Tests such as the opening of an auxiliary contact are described in a document "an auxiliary circuit operation characteristic verification apparatus", which relates to a simple one-time opening, but the adjustment of a circuit time constant does not relate to the timing control of the entire test and is not described in detail, and the test circuit time constant does not satisfy the requirement of not less than 20ms from the observation of a waveform diagram in the document.
In the existing test scheme, the auxiliary contact test is basically in an exploration stage, the test requirement coverage is not comprehensive enough, and the test is usually verified for the on-off test of one type of auxiliary contacts. In addition to this, the following disadvantages exist:
1) the closed/open state of the auxiliary contact cannot be automatically monitored, the definite closed/open state is the premise of sequentially controlling the auxiliary contact, and the current practical situation is that a tester is required to observe and confirm the closed/open state of the auxiliary contact at first and then determine the test control sequence, so that the energy of the tester is consumed and misjudgment is sometimes caused by human factors.
2) Other schemes at present lack accurate control over the whole auxiliary contact breaking test, and the automation degree is low.
3) Adjustments and measurements of the loop time constant are ignored.
SUMMERY OF THE UTILITY MODEL
Aiming at the problems in the prior art, the utility model provides a system for detecting the breaking capacity of an auxiliary contact of high-voltage switch equipment.
The utility model is realized by the following technical scheme:
a system for detecting the breaking capacity of an auxiliary contact of high-voltage switch equipment comprises a main shaft control mechanism, an auxiliary switch state detection circuit, a test circuit, a closing power supply circuit, a breaking power supply circuit, an energy storage power supply circuit and a driving switch assembly;
the switching-on power supply loop, the switching-off power supply loop and the energy storage power supply loop are respectively connected to a power supply connecting end of the spindle control mechanism; the driving switch assembly is assembled on a driving end of the spindle control mechanism, the spindle control mechanism is driven to drive the driving switch assembly to work through a closing power supply loop, an opening power supply loop and an energy storage power supply loop respectively, a plurality of auxiliary switches are arranged on the auxiliary switch state detection loop and the test loop respectively, and the auxiliary switches are connected with the driving switch assembly; the driving switch assembly drives the auxiliary switches to be switched on or switched off simultaneously through the main shaft control mechanism; and an auxiliary switch state detection loop module for monitoring the on or off of a plurality of auxiliary switches is also arranged on the auxiliary switch state detection loop.
Preferably, the test loop further comprises a test power supply, a test loop control switch, a replaceable load, a current meter and a voltmeter; the test power supply, the test loop control switch, the replaceable load, the ammeter and the auxiliary switch are connected in series to form a test loop; the voltmeter is connected in parallel at the auxiliary switch.
Furthermore, the replaceable load comprises a trimming resistor, an auxiliary resistor and an inductor, wherein the trimming resistor, the auxiliary resistor and the inductor are sequentially connected in series along the flow direction of the anode current of the test power supply.
Furthermore, a voltage and current measuring module is arranged at the ammeter and the voltmeter.
Preferably, the closing power supply loop comprises a closing power supply and a closing switch, and the closing switch controls the spindle control mechanism to drive the driving switch assembly to perform closing operation on the auxiliary switch.
Preferably, the opening power supply loop comprises an opening power supply and an opening switch, and the opening switch is closed to control the main shaft control mechanism to drive the driving switch assembly to perform opening operation on the auxiliary switch.
Preferably, the energy storage power supply circuit comprises an energy storage power supply and an energy storage switch, and the energy storage operation of the spindle control mechanism is controlled by closing the energy storage switch.
Preferably, the driving switch assembly comprises a main shaft and an auxiliary shaft, the main shaft is connected to a driving end of the main shaft control mechanism, a driving end of the auxiliary shaft is connected with the main shaft, and a connecting end of the auxiliary shaft is connected with the auxiliary switches respectively to drive the auxiliary switches to be turned on or turned off.
Furthermore, the auxiliary switches are connected on the connecting end of the auxiliary shaft in the same direction, so that the auxiliary switches are switched on or switched off at the same time.
Preferably, the power switches of the test loop, the closing power supply loop, the opening power supply loop and the energy storage power supply loop are all provided with a switch time sequence control module.
Compared with the prior art, the utility model has the following beneficial technical effects:
the utility model provides a system for detecting the breaking capacity of an auxiliary contact of high-voltage switch equipment, wherein a breaking capacity test loop comprises a main shaft control mechanism, an auxiliary switch state detection loop, a test loop, a closing power supply loop, a separating brake power supply loop, an energy storage power supply loop and a driving switch assembly; the auxiliary switch state detection loop and the test loop are respectively provided with a plurality of auxiliary switches and auxiliary contacts, the auxiliary switches are all connected with the driving switch assembly, the auxiliary contacts are in control connection through the auxiliary switches, the switches of the switching power supply loop, the switching-off power supply loop and the energy storage power supply are controlled through the test loop, the switching-on power supply loop, the switching-off power supply loop and the energy storage power supply loop respectively carry out switching-on or switching-off work and energy storage operation on the auxiliary switches by the main shaft control mechanism driving switch assembly, and therefore the opening and closing test of the auxiliary contacts is achieved.
Furthermore, the test loop accurately controls the disconnection test of the whole auxiliary contact, the replaceable load is added, the replaceable load is a module which is adjusted in advance and can meet certain test parameters, and the requirement of the test loop can be quickly met by directly replacing the corresponding load module before the test is carried out.
Furthermore, a voltage and current measuring module is arranged at the position of the ammeter and the voltmeter, and the voltage and current measuring module is used for measuring the test voltage and current, so that the detection efficiency of the voltage and the current is improved.
Furthermore, the driving switch assembly comprises a main shaft and an auxiliary shaft, the main shaft is connected to the driving end of the main shaft control mechanism, the driving end of the auxiliary shaft is connected with the main shaft, the connecting end of the auxiliary shaft is connected with the auxiliary switches respectively to drive the auxiliary switches to be switched on or switched off, the auxiliary contacts can be switched on or switched off through mechanical operation of the main shaft and the auxiliary shaft, and mechanical performance operation is improved.
Furthermore, the power switches of the test loop, the closing power supply loop, the opening power supply loop and the energy storage power supply loop are all provided with switch time sequence control modules, and the closing switch, the opening switch, the energy storage switch and the test loop control switch can be operated and controlled according to a certain time through the switch time sequence control modules, so that the automatic control of the whole test system is realized.
Drawings
Fig. 1 is a schematic structural diagram of a circuit for testing the breaking capacity of an auxiliary contact of high-voltage switchgear in the utility model.
In the figure: 1-a main shaft control mechanism; 2-auxiliary switch state detection loop module; 3-replaceable load; 41-a voltmeter; 42-an ammeter; 5-test power supply; 6-switching on a power supply; 7-a switching-off power supply; 8-an energy storage power supply; 9-an auxiliary switch; 10-a main shaft; 11-an auxiliary shaft; 12-driving a switch assembly; 13-auxiliary switch state detection circuit; 14-test loop; 15-closing a power supply loop; 16-a switching-off power supply loop; 17-energy storage power supply loop; 31-a trimming resistor; 32-auxiliary resistance; 33-an inductance; 51-test loop control switch; 61-a closing switch; 71-a switch-off switch; 81-energy storage switch.
Detailed Description
In order to make the technical solutions of the present invention better understood, 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 only a part of the embodiments of the present invention, and not all of the embodiments. 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, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the utility model described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The utility model is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, in an embodiment of the present invention, a system for detecting a breaking capability of an auxiliary contact of a high voltage switchgear is provided, and the breaking capability test loop has a simple structure and is operated to effectively improve test efficiency and accuracy.
Specifically, the breaking capacity test loop comprises a main shaft control mechanism 1, an auxiliary switch state detection loop 13, a test loop 14, a closing power supply loop 15, a separating power supply loop 16, an energy storage power supply loop 17 and a driving switch assembly 12;
the switching-on power supply loop 15, the switching-off power supply loop 16 and the energy storage power supply loop 17 are respectively connected to the power supply connecting end of the main shaft control mechanism 1; the driving switch assembly 12 is assembled on a driving end of the spindle control mechanism 1, the spindle control mechanism 1 is driven to drive the driving switch assembly 12 to work through a closing power supply loop 15, a separating power supply loop 16 and an energy storage power supply loop 17, a plurality of auxiliary switches 9 and auxiliary contacts are arranged on the auxiliary switch state detection loop 13 and the test loop 14, wherein the auxiliary switches 9 are connected with the driving switch assembly 12, and the auxiliary contacts are in control connection through the auxiliary switches 9; the driving switch assembly drives a plurality of auxiliary switches 9 to be switched on or switched off simultaneously through the main shaft control mechanism 1; and an auxiliary switch state detection loop module (2) for monitoring the closing or breaking of the auxiliary switches (9) is also arranged on the auxiliary switch state detection loop 13.
Specifically, the test loop 14 further includes a test power supply 5, a test loop control switch 51, a replaceable load 3, an ammeter 41 and a voltmeter 42; the test power supply 5, the test loop control switch 51, the replaceable load 3, the ammeter 41 and the auxiliary switch 9 are connected in series to form a test loop 14; the voltmeter 42 is connected in parallel at the auxiliary switch 9.
The replaceable load 3 comprises a trimming resistor 31, an auxiliary resistor 32 and an inductor 33, wherein the trimming resistor 31, the auxiliary resistor 32 and the inductor 33 are sequentially connected in series along the flow direction of the positive pole current of the test power supply 5.
Wherein, the ammeter 41 and the voltmeter 42 are provided with a voltage and current measuring module.
Specifically, the closing power supply loop comprises a closing power supply 6 and a closing switch 61, and the closing switch 61 is closed to control the main shaft control mechanism 1 to drive the driving switch assembly 12 to perform closing operation on the auxiliary switch.
Specifically, the opening power supply circuit 15 includes an opening power supply 7 and an opening switch 71, and the main shaft control mechanism 1 is controlled by closing the opening switch 71 to drive the driving switch assembly 12 to perform opening operation on the auxiliary switch.
Specifically, the energy storage power circuit 16 includes an energy storage power source 8 and an energy storage switch 81, and the energy storage operation of the spindle control mechanism 1 is controlled by closing the energy storage switch 81.
Specifically, the driving switch assembly 12 includes a main shaft 10 and an auxiliary shaft 11, the main shaft 10 is connected at a driving end of the main shaft control mechanism 1, a driving end of the auxiliary shaft 11 is connected with the main shaft 10, and a connecting end of the auxiliary shaft 11 is connected with the plurality of auxiliary switches 9 respectively to drive the plurality of auxiliary switches 9 to be turned on or turned off.
Wherein, a plurality of auxiliary switches 9 are connected on the connecting end of the auxiliary shaft 11 in the same direction, so that the plurality of auxiliary switches 9 are simultaneously opened or closed.
Specifically, the power switches of the test loop 14, the closing power supply loop 15, the opening power supply loop 16 and the energy storage power supply loop 17 are all provided with a switch timing control module.
The breaking capacity of the auxiliary contact in the utility model is as follows: the contacts should carry and open a current 5s corresponding to the auxiliary contact rating according to table 1 in the inductive loop. The relative deviation of the test voltage is (0-10%), and the relative deviation of the test current amplitude is (0-10%).
For all grades, the time constant of the loop should be no less than 20ms, with a relative deviation of (0-20%).
This experiment should be repeated 20 times with 1min intervals between each experiment. The recovery voltage should be maintained for 300ms + -30 ms during the 1min interval after the last operation. The resistance of the contacts should be measured before and after the test, and both measurements should be performed at ambient temperature. The increase in resistance should be less than 20%.
An auxiliary switch: switch consisting of one or more pairs of control and/or auxiliary contacts mechanically operated by a switching device.
Auxiliary contacts: a contact connected in the auxiliary circuit of the mechanical switching device and mechanically operated by the mechanical switching device.
The RL inductive loop time constant τ is L/R.
The utility model elaborates in detail by meeting the requirements of the auxiliary contact breaking test:
1) all the auxiliary contact breaking tests need to meet the requirement that the loop time constant is larger than or equal to 20ms, the tests need to be completed in an inductive loop, the test loop is formed by connecting resistors and inductors in series, the maximum current borne by the test loop can be calculated to be 440W/110V-4A, the maximum value of the resistors in the loop is 220V/0.1A-2200 omega, and the maximum value of the inductors in the loop is 20 ms-2200 omega-44H according to a loop time constant calculation formula tau L/R and the grades of the auxiliary contacts as shown in Table 1.
TABLE 1 grade of auxiliary contacts
If the adjustable resistance box and the adjustable inductance box are required to cover all test requirements according to the calculated parameters, the maximum value of the inductance of the test loop is 44H, the maximum current is 4A, and the inductance volume is very large if the two conditions are met at the same time according to practical experience.
Therefore, the auxiliary contacts are firstly classified according to actual market requirements, and then the replaceable load is formed by the fixed inductor and the resistor, so that the test requirements can be met, and the test loop is simpler and easier to implement. And (4) calculating to obtain a table 3 replaceable load summary table according to the table 2 auxiliary contact breaking classification.
TABLE 2 auxiliary contact disconnection Classification
Table 3 replaceable load summary
2) In the case of performing the opening test of the auxiliary contact, it is necessary to be able to control the opening/closing operation of the auxiliary contact, and the entire auxiliary contact is actually a contact which is connected to an auxiliary circuit of the mechanical switching device and is mechanically operated by the mechanical switching device. And therefore need to be precisely controlled by mechanical switches.
The mechanical switch control part of the utility model is accurately controlled by a closing power supply and a switching device thereof, an opening power supply and a switching device thereof, an energy storage power supply and a switching device thereof, thereby meeting the requirement of repeatedly carrying out 20 times of operations at an interval of 1 min.
3) When the switching device controls the auxiliary contact, firstly, the auxiliary switch is required to be confirmed to be in a closed or open state at present, and only after the state of the auxiliary contact is confirmed, the auxiliary switch can be subjected to disconnection test operation. An auxiliary switch state detection loop module is added in the scheme, automatic judgment is carried out on the auxiliary contact through the auxiliary switch state detection loop module, and then an automatic test control sequence is implemented.
The utility model relates to a system for detecting the breaking capacity of an auxiliary contact of high-voltage switch equipment, which is used for:
when the breaking capacity of the auxiliary contact of the high-voltage switch equipment is verified, the requirement of a standard test loop for breaking the contact is met by connecting a specific inductor 33, a trimming resistor 31 and an auxiliary resistor 32 in series in the test loop and adjusting the inductor 33, the trimming resistor 31 and the auxiliary resistor 32. Meanwhile, the test loop control switch controls a closing power supply loop, an opening power supply loop and an energy storage power supply loop through a switch time sequence control module respectively;
when a power supply circuit is controlled to be switched on, the main shaft control mechanism 1 is controlled to drive the main shaft 10 to drive the auxiliary shaft 11 to move through the switch-on switch 61, the auxiliary shaft 11 drives the auxiliary switches 9 to be switched on, and the auxiliary switch state detection circuit module 2 monitors the switch-on of the auxiliary switches 9;
when a brake closing power supply loop is controlled, the main shaft control mechanism 1 is controlled to drive the main shaft 10 to drive the auxiliary shaft 11 to move through the brake closing switch 71, the auxiliary shaft 11 drives the auxiliary switches 9 to perform brake opening operation, and the auxiliary switch state detection loop module 2 monitors disjunction of the auxiliary switches 9;
when the energy storage power supply circuit is controlled, the energy storage operation of the spindle control mechanism 1 is controlled by closing the energy storage switch 81.
The peripheral high-voltage switch control circuit is used for carrying out breaking and closing operations on the contact, so that the breaking capacity verification of the whole contact is completed.
The utility model classifies the auxiliary contact tests in the current market, facilitates the construction of test loops, and can quickly meet the requirements of various test loops by replacing loads. Provides a precise switch time sequence control module through the research on a high-voltage switch mechanism, and realizes the automatic control of the whole test system. An auxiliary switch state detection loop module is added, and the test efficiency and accuracy are improved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the utility model without departing from the spirit and scope of the utility model, which is to be covered by the claims.
Claims (10)
1. A system for detecting the breaking capacity of an auxiliary contact of high-voltage switch equipment is characterized by comprising a main shaft control mechanism (1), an auxiliary switch state detection loop (13), a test loop (14), a closing power supply loop (15), an opening power supply loop (16), an energy storage power supply loop (17) and a driving switch assembly (12);
the switching-on power supply loop (15), the switching-off power supply loop (16) and the energy storage power supply loop (17) are respectively connected to the power supply connecting end of the spindle control mechanism (1); the driving switch assembly (12) is assembled on the driving end of the main shaft control mechanism (1), the main shaft control mechanism (1) is driven to drive the driving switch assembly (12) to work through the closing power supply loop (15), the opening power supply loop (16) and the energy storage power supply loop (17), a plurality of auxiliary switches (9) are arranged on the auxiliary switch state detection loop (13) and the test loop (14), and the auxiliary switches (9) are connected with the driving switch assembly (12); the driving switch assembly (12) drives a plurality of auxiliary switches (9) to be closed or opened simultaneously through the main shaft control mechanism (1); and the auxiliary switch state detection loop (13) is also provided with an auxiliary switch (9) state detection loop module (2) for monitoring the closing or breaking of the plurality of auxiliary switches (9).
2. The system for detecting the breaking capacity of an auxiliary contact of a high-voltage switchgear according to claim 1, characterized in that the test circuit (14) further comprises a test power supply (5), a test circuit control switch (51), a replaceable load (3), an ammeter (41) and a voltmeter (42); the test power supply (5), the test loop control switch (51), the replaceable load (3), the ammeter (41) and the auxiliary switch (9) are connected in series to form a test loop (14); the voltmeter (42) is connected in parallel at the auxiliary switch (9).
3. The system for detecting the breaking capability of the auxiliary contact of the high-voltage switchgear according to claim 2, wherein the replaceable load (3) comprises a trimming resistor (31), an auxiliary resistor (32) and an inductor (33), and the trimming resistor (31), the auxiliary resistor (32) and the inductor (33) are sequentially connected in series along the flow direction of the positive current of the test power supply (5).
4. The system for detecting the breaking capacity of the auxiliary contact of the high-voltage switchgear according to claim 2, characterized in that a voltage and current measuring module is provided at the ammeter (41) and the voltmeter (42).
5. The system for detecting the breaking capability of the auxiliary contact of the high-voltage switchgear according to claim 1, wherein the switching power circuit (15) comprises a switching power source (6) and a switching switch (61), and the switching operation of the auxiliary switch (9) is performed by closing the switching switch (61) and controlling the main shaft control mechanism (1) to drive the driving switch assembly (12).
6. The system for detecting the breaking capability of the auxiliary contact of the high-voltage switchgear is characterized in that the opening power supply circuit (16) comprises an opening power supply (7) and an opening switch (71), and the main shaft control mechanism (1) is controlled to drive the driving switch assembly (12) to perform opening operation on the auxiliary switch (9) by closing the opening switch (71).
7. The system for detecting the breaking capability of the auxiliary contact of the high-voltage switchgear according to claim 1, wherein the energy storage power circuit (17) comprises an energy storage power source (8) and an energy storage switch (81), and the energy storage operation of the main shaft control mechanism (1) is controlled by closing the energy storage switch (81).
8. The system for detecting the breaking capacity of the auxiliary contact of the high-voltage switchgear according to claim 1, wherein the driving switch assembly (12) comprises a main shaft (10) and an auxiliary shaft (11), the main shaft (10) is connected to a driving end of the main shaft control mechanism (1), a driving end of the auxiliary shaft (11) is connected to the main shaft (10), and a plurality of auxiliary switches (9) are connected to a connecting end of the auxiliary shaft (11) respectively to drive the plurality of auxiliary switches (9) to be opened or closed.
9. The system for detecting the breaking capability of an auxiliary contact of a high-voltage switchgear according to claim 8, characterized in that a plurality of auxiliary switches (9) are connected in the same direction at the connection end of the auxiliary shaft (11), so that a plurality of auxiliary switches (9) are opened or closed simultaneously.
10. The system for detecting the breaking capacity of the auxiliary contact of the high-voltage switchgear according to claim 1, wherein the power switches of the test loop (14), the closing power supply loop (15), the opening power supply loop (16) and the energy storage power supply loop (17) are all provided with a switch timing control module.
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| CN202220233175.7U CN216792391U (en) | 2022-01-27 | 2022-01-27 | Breaking capacity detection system of auxiliary contact of high-voltage switch equipment |
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| CN202220233175.7U CN216792391U (en) | 2022-01-27 | 2022-01-27 | Breaking capacity detection system of auxiliary contact of high-voltage switch equipment |
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