CN116338447A - Method for monitoring opening and closing states of isolating switch - Google Patents
Method for monitoring opening and closing states of isolating switch Download PDFInfo
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- CN116338447A CN116338447A CN202310186342.6A CN202310186342A CN116338447A CN 116338447 A CN116338447 A CN 116338447A CN 202310186342 A CN202310186342 A CN 202310186342A CN 116338447 A CN116338447 A CN 116338447A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 48
- 230000002159 abnormal effect Effects 0.000 description 1
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- 238000010276 construction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
Abstract
The invention provides a method for monitoring the opening and closing states of an isolating switch. Selecting a plurality of monitoring points on a rotating piece of the isolating switch; acquiring a standard motion track of each monitoring point in the opening and closing process of the isolating switch, and setting a track acquisition module according to the standard motion track of each monitoring point to acquire actual motion data of the monitoring point in the opening and closing process; responding to an opening and closing instruction of the isolating switch, and acquiring actual motion data of a plurality of monitoring points through a plurality of track acquisition modules in a one-to-one correspondence mode; the plurality of designated positions comprise a start position and an end position; according to actual motion data of a plurality of monitoring points on the rotating member with the same phase, acquiring a plurality of opening and closing parameters of the rotating member in the opening and closing process; and judging whether the isolating switch is opened or closed in place according to a plurality of opening and closing parameters of all phases of rotating parts. The invention solves the technical problems of inconvenient monitoring of the opening and closing state and the synchronism of the three-phase isolating switch in the prior art.
Description
Technical Field
The invention relates to the technical field of state monitoring of isolating switches, in particular to a method for monitoring the opening and closing states of isolating switches.
Background
The isolating switch is one kind of electric power primary equipment widely used in power distribution system, and is used in circuit separation and combination, and has simple operation principle, high use amount, high isolating voltage effect in the circuit and safe maintenance and construction. Before a certain device or a certain part of a circuit is overhauled, isolating switches on two sides of the device or the circuit of the part are firstly cut off, voltages on two sides are isolated, an obvious breaking point is arranged in the circuit, and then a grounding wire is additionally arranged on the power failure overhauling device or the circuit of the part, so that the safety of overhauling work can be ensured. However, under the influence of long-term use and external environmental factors, the phenomenon that the isolating switch is not closed in place or is opened or closed in the process of opening or closing due to the isolating switch, the motor can act correctly, the auxiliary contact is in place, and the action switch is not completely in place is easy to cause misoperation accidents.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a method for monitoring the opening and closing state of an isolating switch, which solves the technical problems of inconvenient monitoring of the opening and closing state and synchronism of a three-phase isolating switch existing in the prior art.
The invention relates to a method for monitoring the opening and closing state of an isolating switch, which comprises the following steps:
selecting a plurality of monitoring points on a rotating member of the isolating switch, wherein the plurality of monitoring points are distributed at intervals along the extending direction of the rotating member;
acquiring a standard motion track of each monitoring point in the opening and closing process of the isolating switch, and setting a track acquisition module according to the standard motion track of each monitoring point to acquire actual motion data of the monitoring point in the opening and closing process;
responding to an opening and closing instruction of the isolating switch, and acquiring actual motion data of a plurality of monitoring points through a plurality of track acquisition modules in a one-to-one correspondence mode; the actual motion data comprise the time and the speed of the monitoring point reaching a plurality of designated positions in the standard motion trail; the plurality of designated positions comprise a start position and an end position;
according to actual motion data of a plurality of monitoring points on a rotating member with the same phase, acquiring a plurality of opening and closing parameters of the rotating member in the opening and closing process;
and judging whether the isolating switch is opened or closed in place according to a plurality of opening and closing parameters of all phases of rotating parts.
Further, obtaining a plurality of opening and closing parameters of the rotating member in the opening and closing process includes:
acquiring the duration from the start of the action to the end of the action of each monitoring point according to the time when each monitoring point reaches a plurality of designated positions in the corresponding standard motion track;
acquiring an average value of time periods from the start of action to the end of action of all monitoring points as the action time period of the rotating piece;
acquiring the starting speed, the ending speed and the midway speed of each monitoring point according to the speed of each monitoring point reaching a plurality of designated positions in the standard motion track;
acquiring an average value of starting speeds of all monitoring points as a starting action speed of a rotating member; acquiring an average value of the midway speeds of all monitoring points as the midway action speed of the rotating piece; and obtaining the average value of the ending speeds of all the monitoring points as the ending action speed of the rotating piece.
Further, judging whether the isolating switch is in place or not, comprising:
when the starting action speed of each phase of rotating piece is larger than the first set starting speed, the first opening condition is met;
when the difference of the midway action speeds of any two phase rotating parts is smaller than the first set speed difference value, the second brake separating condition is met;
when the ending action speed of each phase of rotating piece is smaller than the first set ending speed, a third opening condition is met;
when the difference of the action time lengths of any two-phase rotating parts is smaller than the first set time length, a fourth brake separating condition is met;
when the difference of the action starting time of any two-phase rotating parts is smaller than the second set duration, a fifth opening condition is met;
when the first opening condition, the second opening condition, the third opening condition, the fourth opening condition and the fifth opening condition are all met, the disconnecting switch is judged to be in place.
Further, judging whether the isolating switch is closed in place includes:
when the starting action speed of each phase of rotating piece is larger than the second set starting speed, the first closing condition is met;
when the difference of the midway action speeds of any two phase rotating parts is smaller than the second set speed difference value, a second closing condition is met;
when the ending action speed of each phase of rotating piece is larger than the second set ending speed, a third closing condition is met;
when the difference of the action time lengths of any two-phase rotating parts is smaller than the third set time length, a fourth closing condition is met;
when the difference of the action ending time of any two-phase rotating piece is smaller than the fourth set duration, a fifth closing condition is met;
and when the first closing condition, the second closing condition, the third closing condition, the fourth closing condition and the fifth closing condition are all met, judging that the isolating switch is closed in place.
Further, the halfway speed includes:
the average value of the speeds of a plurality of designated positions except the starting position and the ending position of the monitoring point on the standard movement track.
Further, the track acquisition module comprises a plurality of groups of infrared receiving and transmitting equipment and a processor; the infrared receiving and transmitting devices are arranged in a one-to-one correspondence manner along a plurality of designated positions of a standard movement track corresponding to the monitoring points;
each group of infrared transceiver comprises an infrared receiver and an infrared transmitter, and the infrared receivers and the infrared transmitters are arranged at two sides of the rotating piece in a one-to-one correspondence manner;
the processor responds to the opening and closing instruction, controls the infrared transmitters to transmit infrared rays to the corresponding infrared receivers, the infrared receivers transmit receiving signals to the processor, and the processor acquires intermittent data of each receiving signal to acquire time and speed of a monitoring point reaching each designated position.
Further, obtaining the time and speed of the monitoring point reaching each designated position includes:
according to the intermittent data of the corresponding received signal when the monitoring point reaches the designated position, the intermittent data comprise intermittent start time, intermittent end time and intermittent duration;
acquiring the median of the break start time and the break end time as the time for the monitoring point to reach the designated position;
and acquiring the width of the rotating member at the corresponding position of the monitoring point, and acquiring the speed of the monitoring point at the designated position according to the intermittent time length.
Further, the method further comprises the following steps: at least four designated positions are arranged on each standard movement track.
Further, at least two monitoring points are arranged on the same rotating piece.
Further, a monitoring point is arranged on the rotating piece close to the moving contact.
Compared with the prior art, the invention has the following beneficial effects:
in the embodiment, a plurality of monitoring points are arranged on the rotating member of each phase isolating switch, a plurality of designated positions are arranged on the standard motion track of each monitoring point, and each designated position is provided with a track acquisition module to acquire actual motion data when the monitoring point on the rotating member reaches the designated position, so that the actual motion data is more accurate; meanwhile, a plurality of opening and closing parameters of the rotating parts in the opening and closing process are obtained through actual motion data of each phase of rotating parts, and whether opening and closing are in place or not is judged through the plurality of opening and closing parameters. The technical problem that the switching-on and switching-off states and the synchronicity of the three-phase isolating switch in the prior art are inconvenient to monitor is solved.
Drawings
Fig. 1 is a method step diagram of an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, a method for monitoring the opening and closing state of an isolating switch includes:
selecting a plurality of monitoring points on a rotating member of the isolating switch, wherein the plurality of monitoring points are distributed at intervals along the extending direction of the rotating member;
acquiring a standard motion track of each monitoring point in the opening and closing process of the isolating switch, and setting a track acquisition module according to the standard motion track of each monitoring point to acquire actual motion data of the monitoring point in the opening and closing process;
responding to an opening and closing instruction of the isolating switch, and acquiring actual motion data of a plurality of monitoring points through a plurality of track acquisition modules in a one-to-one correspondence mode; the actual motion data comprise the time and the speed of the monitoring point reaching a plurality of designated positions in the standard motion trail; the plurality of designated positions comprise a start position and an end position;
according to actual motion data of a plurality of monitoring points on a rotating member with the same phase, acquiring a plurality of opening and closing parameters of the rotating member in the opening and closing process;
and judging whether the isolating switch is opened or closed in place according to a plurality of opening and closing parameters of all phases of rotating parts.
The implementation process of the embodiment comprises the following steps:
the isolating switch is a switching device which is mainly used for isolating a power supply, switching operation and switching on and off a small current circuit and has no arc extinguishing function. When the isolating switch is in the separated position, the contacts have an insulation distance and an obvious disconnection mark which meet the specified requirements; in the closed position, the switching device is capable of carrying both current under normal loop conditions and current under abnormal conditions (e.g., short circuit) for a prescribed period of time. The high-voltage isolating switch is generally used as a high-voltage isolating switch, namely, the isolating switch with the rated voltage of more than 1kV, has a simple working principle and structure, but has high requirements on working reliability due to large use amount, and has larger influence on the design, establishment and safe operation of power substations and power plants. The isolating switch has the main characteristics of no arc extinguishing capability and can only switch on and switch off the circuit under the condition of no load current.
The isolating switch mainly has the following states: the closed state, the split state, the incomplete closed state, the incomplete split state and the open-phase operation.
Therefore, the three-phase isolating switch has high requirement on synchronism in the switching-on and switching-off process; once the opening and closing are not in place or the synchronism is poor, the electric safety accident is easily caused.
According to the structure of the rotating piece of the isolating switch, at least two monitoring points are arranged on the same rotating piece;
in the embodiment, three monitoring points are arranged on the rotating piece; one of the monitoring points is arranged on the rotating member and is close to the moving contact.
Acquiring standard motion tracks corresponding to every monitoring point according to the opening and closing rule of the rotating piece; and at least four designated positions are arranged on each standard movement track. Acquiring actual motion data when the rotating member reaches each designated position; and acquiring a plurality of opening and closing parameters of each corresponding rotating piece according to the actual motion data to judge whether the isolating switch is opened or closed in place.
The method for obtaining a plurality of opening and closing parameters of the rotating member in the opening and closing process comprises the following steps:
acquiring the duration from the start of the action to the end of the action of each monitoring point according to the time when each monitoring point reaches a plurality of designated positions in the corresponding standard motion track;
acquiring an average value of time periods from the start of action to the end of action of all monitoring points as the action time period of the rotating piece;
acquiring the starting speed, the ending speed and the midway speed of each monitoring point according to the speed of each monitoring point reaching a plurality of designated positions in the standard motion track;
acquiring an average value of starting speeds of all monitoring points as a starting action speed of a rotating member; acquiring an average value of the midway speeds of all monitoring points as the midway action speed of the rotating piece; and obtaining the average value of the ending speeds of all the monitoring points as the ending action speed of the rotating piece. The intermediate speed includes: the average value of the speeds of a plurality of designated positions except the starting position and the ending position of the monitoring point on the standard movement track.
It should be noted that, in this embodiment, obtaining the time and the speed of the monitoring point reaching each designated position includes:
according to the intermittent data of the corresponding received signal when the monitoring point reaches the designated position, the intermittent data comprise intermittent start time, intermittent end time and intermittent duration;
acquiring the median of the break start time and the break end time as the time for the monitoring point to reach the designated position;
and acquiring the width of the rotating member at the corresponding position of the monitoring point, and acquiring the speed of the monitoring point at the designated position according to the intermittent time length.
In the embodiment, a plurality of monitoring points are arranged on the rotating member of each phase isolating switch, a plurality of designated positions are arranged on the standard motion track of each monitoring point, and each designated position is provided with a track acquisition module to acquire actual motion data when the monitoring point on the rotating member reaches the designated position, so that the actual motion data is more accurate; meanwhile, a plurality of opening and closing parameters of the rotating parts in the opening and closing process are obtained through actual motion data of each phase of rotating parts, and whether opening and closing are in place or not is judged through the plurality of opening and closing parameters. The technical problem that the switching-on and switching-off states and the synchronicity of the three-phase isolating switch in the prior art are inconvenient to monitor is solved.
In another embodiment of the present invention, determining whether the isolating switch is in place includes:
when the starting action speed of each phase of rotating piece is larger than the first set starting speed, the first opening condition is met;
when the difference of the midway action speeds of any two phase rotating parts is smaller than the first set speed difference value, the second brake separating condition is met;
when the ending action speed of each phase of rotating piece is smaller than the first set ending speed, a third opening condition is met;
when the difference of the action time lengths of any two-phase rotating parts is smaller than the first set time length, a fourth brake separating condition is met;
when the difference of the action starting time of any two-phase rotating parts is smaller than the second set duration, a fifth opening condition is met;
when the first opening condition, the second opening condition, the third opening condition, the fourth opening condition and the fifth opening condition are all met, the disconnecting switch is judged to be in place.
Wherein, judge whether isolator closes a floodgate in place, include:
when the starting action speed of each phase of rotating piece is larger than the second set starting speed, the first closing condition is met;
when the difference of the midway action speeds of any two phase rotating parts is smaller than the second set speed difference value, a second closing condition is met;
when the ending action speed of each phase of rotating piece is larger than the second set ending speed, a third closing condition is met;
when the difference of the action time lengths of any two-phase rotating parts is smaller than the third set time length, a fourth closing condition is met;
when the difference of the action ending time of any two-phase rotating piece is smaller than the fourth set duration, a fifth closing condition is met;
and when the first closing condition, the second closing condition, the third closing condition, the fourth closing condition and the fifth closing condition are all met, judging that the isolating switch is closed in place.
The implementation process of the embodiment comprises the following steps:
in the present embodiment, in the process of opening the gate, the synchronicity of opening the gate, that is, the time of starting the gate, the speed of starting the gate and the time of the whole process are important to be considered, and the corresponding conditions must be satisfied; so the requirements of the first, fourth and fifth opening conditions are relatively high; the requirements of the second and third opening conditions may be relatively low; when a plurality of opening and closing parameters generated in the opening process of the three-phase isolating switch meet a first opening condition, a second opening condition, a third opening condition, a fourth opening condition and a fifth opening condition, the isolating switch is judged to be in place.
In the closing process, the ending time, ending speed and acting duration of the action need to be considered seriously, so that the requirements of the third closing condition, the fourth closing condition and the fifth closing condition are relatively higher, and the first closing condition and the second closing condition can be set relatively lower; and when the first closing condition, the second closing condition, the third closing condition, the fourth closing condition and the fifth closing condition are all met, judging that the isolating switch is closed in place.
In another embodiment of the present invention, the track acquisition module includes a plurality of sets of infrared transceiver devices and a processor; the infrared receiving and transmitting devices are arranged in a one-to-one correspondence manner along a plurality of designated positions of a standard movement track corresponding to the monitoring points;
each group of infrared transceiver comprises an infrared receiver and an infrared transmitter, and the infrared receivers and the infrared transmitters are arranged at two sides of the rotating piece in a one-to-one correspondence manner;
the processor responds to the opening and closing instruction, controls the infrared transmitters to transmit infrared rays to the corresponding infrared receivers, the infrared receivers transmit receiving signals to the processor, and the processor acquires intermittent data of each receiving signal to acquire time and speed of a monitoring point reaching each designated position.
The implementation process of the embodiment comprises the following steps:
the infrared transceiver is arranged at the appointed position of the movement track of the monitoring point, and the infrared receivers and the infrared transmitters are arranged at two sides of the rotating piece in a one-to-one correspondence manner; when the rotating piece is positioned between the infrared receiver and the infrared transmitter, the infrared signal transmitted by the infrared transmitter is blocked, the infrared receiver cannot receive the infrared signal, the receiving signal is disconnected, and the interruption starting time of the receiving signal is recorded; when the rotating member passes through the infrared receiver and the infrared transmitter, the infrared receiver re-receives the infrared signal, the received signal is recovered, and the intermittent ending time of the received signal is recorded. The infrared receiver and the infrared transmitter are matched to collect intermittent data when the monitoring point on the rotating member reaches the designated position, so that actual motion data when the monitoring point reaches the designated position is further obtained.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (10)
1. A method for monitoring the opening and closing state of an isolating switch is characterized by comprising the following steps of: the monitoring method comprises the following steps:
selecting a plurality of monitoring points on a rotating member of the isolating switch, wherein the plurality of monitoring points are distributed at intervals along the extending direction of the rotating member;
acquiring a standard motion track of each monitoring point in the opening and closing process of the isolating switch, and setting a track acquisition module according to the standard motion track of each monitoring point to acquire actual motion data of the monitoring point in the opening and closing process;
responding to an opening and closing instruction of the isolating switch, and acquiring actual motion data of a plurality of monitoring points through a plurality of track acquisition modules in a one-to-one correspondence mode; the actual motion data comprise the time and the speed of the monitoring point reaching a plurality of designated positions in the standard motion trail; the plurality of designated positions comprise a start position and an end position;
according to actual motion data of a plurality of monitoring points on a rotating member with the same phase, acquiring a plurality of opening and closing parameters of the rotating member in the opening and closing process;
and judging whether the isolating switch is opened or closed in place according to a plurality of opening and closing parameters of all phases of rotating parts.
2. The method for monitoring the opening and closing state of an isolating switch as claimed in claim 1, wherein: acquiring a plurality of opening and closing parameters of a rotating part in an opening and closing process, wherein the method comprises the following steps:
acquiring the duration from the start of the action to the end of the action of each monitoring point according to the time when each monitoring point reaches a plurality of designated positions in the corresponding standard motion track;
acquiring an average value of time periods from the start of action to the end of action of all monitoring points as the action time period of the rotating piece;
acquiring the starting speed, the ending speed and the midway speed of each monitoring point according to the speed of each monitoring point reaching a plurality of designated positions in the standard motion track;
acquiring an average value of starting speeds of all monitoring points as a starting action speed of a rotating member; acquiring an average value of the midway speeds of all monitoring points as the midway action speed of the rotating piece; and obtaining the average value of the ending speeds of all the monitoring points as the ending action speed of the rotating piece.
3. The method for monitoring the opening and closing state of an isolating switch as claimed in claim 2, wherein: judging whether the disconnecting switch is in place or not, comprising:
when the starting action speed of each phase of rotating piece is larger than the first set starting speed, the first opening condition is met;
when the difference of the midway action speeds of any two phase rotating parts is smaller than the first set speed difference value, the second brake separating condition is met;
when the ending action speed of each phase of rotating piece is smaller than the first set ending speed, a third opening condition is met;
when the difference of the action time lengths of any two-phase rotating parts is smaller than the first set time length, a fourth brake separating condition is met;
when the difference of the action starting time of any two-phase rotating parts is smaller than the second set duration, a fifth opening condition is met;
when the first opening condition, the second opening condition, the third opening condition, the fourth opening condition and the fifth opening condition are all met, the disconnecting switch is judged to be in place.
4. The method for monitoring the opening and closing state of an isolating switch as claimed in claim 2, wherein: judging whether the isolating switch is closed in place or not, comprising:
when the starting action speed of each phase of rotating piece is larger than the second set starting speed, the first closing condition is met;
when the difference of the midway action speeds of any two phase rotating parts is smaller than the second set speed difference value, a second closing condition is met;
when the ending action speed of each phase of rotating piece is larger than the second set ending speed, a third closing condition is met;
when the difference of the action time lengths of any two-phase rotating parts is smaller than the third set time length, a fourth closing condition is met;
when the difference of the action ending time of any two-phase rotating piece is smaller than the fourth set duration, a fifth closing condition is met;
and when the first closing condition, the second closing condition, the third closing condition, the fourth closing condition and the fifth closing condition are all met, judging that the isolating switch is closed in place.
5. The method for monitoring the opening and closing state of an isolating switch as claimed in claim 2, wherein: the intermediate speed includes:
the average value of the speeds of a plurality of designated positions except the starting position and the ending position of the monitoring point on the standard movement track.
6. The method for monitoring the opening and closing state of an isolating switch as claimed in claim 1, wherein: the track acquisition module comprises a plurality of groups of infrared receiving and transmitting equipment and a processor; the infrared receiving and transmitting devices are arranged in a one-to-one correspondence manner along a plurality of designated positions of a standard movement track corresponding to the monitoring points;
each group of infrared transceiver comprises an infrared receiver and an infrared transmitter, and the infrared receivers and the infrared transmitters are arranged at two sides of the rotating piece in a one-to-one correspondence manner;
the processor responds to the opening and closing instruction, controls the infrared transmitters to transmit infrared rays to the corresponding infrared receivers, the infrared receivers transmit receiving signals to the processor, and the processor acquires intermittent data of each receiving signal to acquire time and speed of a monitoring point reaching each designated position.
7. The method for monitoring the opening and closing state of an isolating switch as claimed in claim 6, wherein: obtaining the time and the speed of the monitoring point reaching each appointed position, wherein the time and the speed comprise the following steps:
according to the intermittent data of the corresponding received signal when the monitoring point reaches the designated position, the intermittent data comprise intermittent start time, intermittent end time and intermittent duration;
acquiring the median of the break start time and the break end time as the time for the monitoring point to reach the designated position;
and acquiring the width of the rotating member at the corresponding position of the monitoring point, and acquiring the speed of the monitoring point at the designated position according to the intermittent time length.
8. The method for monitoring the opening and closing state of an isolating switch as claimed in claim 1, wherein: further comprises: at least four designated positions are arranged on each standard movement track.
9. The method for monitoring the opening and closing state of an isolating switch as claimed in claim 1, wherein: at least two monitoring points are arranged on the same rotating piece.
10. The method for monitoring the opening and closing state of an isolating switch as claimed in claim 9, wherein: and a monitoring point is arranged on the rotating piece close to the moving contact.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310186342.6A CN116338447A (en) | 2023-02-28 | 2023-02-28 | Method for monitoring opening and closing states of isolating switch |
| PCT/CN2023/132331 WO2024041676A1 (en) | 2023-02-28 | 2023-11-17 | Monitoring method for switching-off/switching-on state of isolating switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310186342.6A CN116338447A (en) | 2023-02-28 | 2023-02-28 | Method for monitoring opening and closing states of isolating switch |
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|---|---|
| CN116338447A true CN116338447A (en) | 2023-06-27 |
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|---|---|---|---|
| CN202310186342.6A Pending CN116338447A (en) | 2023-02-28 | 2023-02-28 | Method for monitoring opening and closing states of isolating switch |
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| CN (1) | CN116338447A (en) |
| WO (1) | WO2024041676A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024041676A1 (en) * | 2023-02-28 | 2024-02-29 | 湖北清江水电开发有限责任公司 | Monitoring method for switching-off/switching-on state of isolating switch |
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| WO2024041676A1 (en) | 2024-02-29 |
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