CN109633432A - Automatic change-over failure modes diagnostic method, device and automatic change-over - Google Patents
Automatic change-over failure modes diagnostic method, device and automatic change-over Download PDFInfo
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- CN109633432A CN109633432A CN201910022017.XA CN201910022017A CN109633432A CN 109633432 A CN109633432 A CN 109633432A CN 201910022017 A CN201910022017 A CN 201910022017A CN 109633432 A CN109633432 A CN 109633432A
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- power switch
- operating mechanism
- switch
- automatic change
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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
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
Abstract
The invention discloses a kind of automatic change-over failure modes diagnostic methods.During controlling the automatic change-over progress power switching operations, while the operating mechanism as described in detecting has been in position corresponding to the power switch "on" position to be closed a floodgate, detect the power switch for being intended to separating brake still in "on" position, then decision mechanism-trouble；Operating mechanism is back to another location again after reaching position corresponding to the power switch "on" position to be closed a floodgate as described in detecting, is detected simultaneously by the power switch for being intended to separating brake still in "on" position, then determines contact adhesion fault.The invention also discloses a kind of automatic change-over failure modes diagnostic device and a kind of automatic change-overs.The present invention can carry out Classification and Identification to failure, be accurately judged to be contact failure or operating mechanism failure on earth, to assist realizing the efficient exclusion of failure；Implementation of the present invention is simple and easy, and cost of implementation is cheap, uses convenient for large-scale promotion.
Description
Technical field
The present invention relates to a kind of automatic change-over failure modes diagnostic methods, belong to low voltage electrical apparatus technology field.
Background technique
It is required to be equipped with to guarantee the power supply reliability of power supply-distribution system in occasions such as hospital, hotel, data centers
The application of double power supply automatic transfer switch, double power supply automatic transfer switch just becomes more and more extensive.Double power-supply automatic transferring is opened
It closes in actual use, unavoidable to will appear various failures and lead to not normal use, user is without normal direction
Manufacturer provides effective fault message, causes manufacturer because that can not grasp effective fault message, can not judge be
Product truly has failure or user using problem, i.e., enabled judgement is product failure, but the classification that can not carry out failure is examined
It is disconnected, i.e., it cannot judge controller failure, operating mechanism failure or contact system failure, lead to not efficiently exclude
User malfunction causes inconvenience to user.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and to provide a kind of automatic change-over failures
Classification diagnosis method is, it can be achieved that the failure to automatic change-over carries out classification diagnosis.
The present invention specifically uses following technical scheme to solve above-mentioned technical problem:
A kind of automatic change-over failure modes diagnostic method, the automatic change-over include: for the first electricity of control respectively
Source, the first power switch of second source access and excision, second source switch, and for driving the first power switch and the
The operating mechanism of two power switches movement；Under the first power switch "on" position, the operating mechanism is located at first position,
Second source switchs under "on" position, and the operating mechanism is located at the second position；First power switch, second source are switched
The location status of opening and closing state and operating mechanism is measured in real time, according to testing result and according to following decision logic pair
The failure of automatic change-over carries out classification diagnosis:
During controlling the automatic change-over progress power switching operations, the operating mechanism as described in detecting has been in
While position corresponding to the power switch "on" position to be closed a floodgate, detect the power switch for being intended to separating brake still in combined floodgate shape
State, then decision mechanism-trouble；Operating mechanism is right in the power switch "on" position institute to be closed a floodgate of arrival as described in detecting
It is back to another location again behind the position answered, the power switch for being intended to separating brake is detected simultaneously by still in "on" position, then determines to touch
Head adhesion fault.
Preferably, the position to the first power switch, the opening and closing state that second source switchs and operating mechanism
State is measured in real time, by switch state respectively with the first power switch, second source switch opening and closing state and
Associated three switching devices of the location status of operating mechanism are realized.
Preferably, the switching device is microswitch.It is further preferred that the microswitch is that closed type contact is opened
It closes.
Following technical scheme can also be obtained according to identical invention thinking:
A kind of automatic change-over failure modes diagnostic device, the automatic change-over include: for the first electricity of control respectively
Source, the first power switch of second source access and excision, second source switch, and for driving the first power switch and the
The operating mechanism of two power switches movement；Under the first power switch "on" position, the operating mechanism is located at first position,
Second source switchs under "on" position, and the operating mechanism is located at the second position；The failure modes diagnostic device includes:
First switching-on and switching-off state detection module, is measured in real time for the opening and closing state to the first power switch；
Second source switch state detection module, for being measured in real time to the opening and closing state that second source switchs；
Operating mechanism detection module is measured in real time for the location status to operating mechanism, at least can be to operation machine
Structure is located at first position and the state of the second position is detected；
Breakdown judge module, for according to the first, second switching-on and switching-off state detection module and operating mechanism detection module
Testing result, and classification diagnosis is carried out according to failure of the following decision logic to automatic change-over:
During controlling the automatic change-over progress power switching operations, the operating mechanism as described in detecting has been in
While position corresponding to the power switch "on" position to be closed a floodgate, detect the power switch for being intended to separating brake still in combined floodgate shape
State, then decision mechanism-trouble；Operating mechanism is right in the power switch "on" position institute to be closed a floodgate of arrival as described in detecting
It is back to another location again behind the position answered, the power switch for being intended to separating brake is detected simultaneously by still in "on" position, then determines to touch
Head adhesion fault.
Preferably, the first, second switching-on and switching-off state detection module and operating mechanism detection module are respectively by with
The associated switching device realization of the location status of one power switch, the opening and closing state of second source switch and operating mechanism
Detection.
Preferably, the switching device is microswitch.It is further preferred that the microswitch is that closed type contact is opened
It closes.
Further, which further includes the fail result for being used to indicate the failure modes diagnostic result of breakdown judge module
Indicating module.
A kind of automatic change-over, comprising: for controlling the first power supply, second source access and the first electricity of excision respectively
Source switch, second source switch, and the operating mechanism for driving the first power switch and second source switch motion；?
Under one power switch "on" position, the operating mechanism is located at first position, in the case where second source switchs "on" position, the behaviour
Make mechanism and is located at the second position；The automatic change-over further includes automatic change-over failure point described in any technical solution as above
Class diagnostic device.
Compared with prior art, the invention has the following advantages:
Using technical solution of the present invention, when automatic change-over breaks down, Classification and Identification, accurate judgement can be carried out to failure
Haveing is contact failure or operating mechanism failure on earth, to assist realizing the efficient exclusion of failure；Implementation letter of the present invention
Single easy, cost of implementation is cheap, uses convenient for large-scale promotion.
Detailed description of the invention
Fig. 1 is configuration state schematic diagram of the automatic change-over ontology in the road II power switch combined floodgate or double points；
Fig. 2 is configuration state schematic diagram of the automatic change-over ontology when the road I power switch closes a floodgate；
Fig. 3 is configuration state schematic diagram of the automatic change-over ontology in the road I power switch combined floodgate or double points；
Fig. 4 is configuration state schematic diagram of the automatic change-over ontology when the road II power supply closes a floodgate；
Fig. 5 is the circuit block diagram of automatic transfer switch controller.
Appended drawing reference meaning is as follows in figure:
1, switching device, 2, switching device, 3, switching device, 4, output shaft, 5, cam, 6, connecting rod, 61, boss.
Specific embodiment
The deficiency of Classification and Identification, resolving ideas of the invention can not be carried out to automatic change-over failure for the prior art
It is that the location information of the switch state to two-way power switch and operating mechanism is measured in real time respectively, and is tied according to detection
It is to belong to operating mechanism failure that fruit judgement, which is out of order, still falls within contact adhesion fault.Technical solution tool proposed by the invention
Body is as follows:
A kind of automatic change-over failure modes diagnostic method, the automatic change-over include: for the first electricity of control respectively
Source, the first power switch of second source access and excision, second source switch, and for driving the first power switch and the
The operating mechanism of two power switches movement；Under the first power switch "on" position, the operating mechanism is located at first position,
Second source switchs under "on" position, and the operating mechanism is located at the second position；First power switch, second source are switched
The location status of opening and closing state and operating mechanism is measured in real time, according to testing result and according to following decision logic pair
The failure of automatic change-over carries out classification diagnosis:
During controlling the automatic change-over progress power switching operations, the operating mechanism as described in detecting has been in
While position corresponding to the power switch "on" position to be closed a floodgate, detect the power switch for being intended to separating brake still in combined floodgate shape
State, then decision mechanism-trouble；Operating mechanism is right in the power switch "on" position institute to be closed a floodgate of arrival as described in detecting
It is back to another location again behind the position answered, the power switch for being intended to separating brake is detected simultaneously by still in "on" position, then determines to touch
Head adhesion fault.
A kind of automatic change-over failure modes diagnostic device, the automatic change-over include: for controlling the respectively
One power supply, the first power switch of second source access and excision, second source switch, and for driving the first power switch
With the operating mechanism of second source switch motion；Under the first power switch "on" position, the operating mechanism is located at first
It sets, in the case where second source switchs "on" position, the operating mechanism is located at the second position；The failure modes diagnostic device packet
It includes:
First switching-on and switching-off state detection module, is measured in real time for the opening and closing state to the first power switch；
Second source switch state detection module, for being measured in real time to the opening and closing state that second source switchs；
Operating mechanism detection module is measured in real time for the location status to operating mechanism, at least can be to operation machine
Structure is located at first position and the state of the second position is detected；
Breakdown judge module, for according to the first, second switching-on and switching-off state detection module and operating mechanism detection module
Testing result, and classification diagnosis is carried out according to failure of the following decision logic to automatic change-over:
During controlling the automatic change-over progress power switching operations, the operating mechanism as described in detecting has been in
While position corresponding to the power switch "on" position to be closed a floodgate, detect the power switch for being intended to separating brake still in combined floodgate shape
State, then decision mechanism-trouble；Operating mechanism is right in the power switch "on" position institute to be closed a floodgate of arrival as described in detecting
It is back to another location again behind the position answered, the power switch for being intended to separating brake is detected simultaneously by still in "on" position, then determines to touch
Head adhesion fault.
Automatic change-over is generally divided into two positions automatic change-over and three position automatic change-overs, and (it also has one
The double of a two power switches separating brakes divide location status), for two positions automatic change-over, in the first power switch
Under "on" position, the operating mechanism is located at first position, and in the case where second source switchs "on" position, the operating mechanism is located at
The second position；For three position automatic change-overs, under the first power switch "on" position or two-way power switch divides
Under lock state and first via power switch combined floodgate ready state, the operating mechanism is located at first position, switchs in second source
Under "on" position or under two-way power switch gate-dividing state and the second road power switch combined floodgate ready state, the operating mechanism
Positioned at the second position.
The specific implementation of above-mentioned first, second switching-on and switching-off state detection module and operating mechanism detection module,
Flexible configuration can be carried out according to the practical structures of automatic change-over, as long as being able to achieve corresponding detection function；From realization
Cost and reliability perspectives consider, it is preferable that the first, second switching-on and switching-off state detection module and operating mechanism detect mould
Block is respectively by associated with the location status of the first power switch, the opening and closing state of second source switch and operating mechanism
Switching device realize detection.The preferably simple and reliable microswitch of the switching device.The microswitch is preferably normally closed
Type contact switch.
Final fault diagnosis result can be transferred to by fieldbus or communication module host computer or remote monitoring room into
The further analysis processing of row；Troubleshooting operation is carried out for the ease of on-site identification and in time, which can also further wrap
Include the fail result indicating module for being used to indicate the failure modes diagnostic result of breakdown judge module, such as the instruction of different colours
Lamp perhaps charactron or touch screen etc. directly can also carry out failure modes using the man-machine interface of automatic change-over and examine
The display of disconnected result.
To come below by a specific embodiment of automatic change-over of the present invention and in conjunction with attached drawing convenient for public understanding
Technical solution of the present invention is described in detail:
For the present embodiment by taking the automatic change-over with three positions as an example, double power supply automatic transfer switch includes automatic change-over
Ontology and controller, automatic change-over ontology is comprising I, II two-way power switch and for driving I, II two-way power switch
The operating mechanism of movement.As shown in Fig. 1 ~ 4, switching device 1 ~ 3, this reality are installed on the operating mechanism of automatic change-over ontology
The switching device 1 ~ 3 in example is applied by taking normally-closed contact type microswitch as an example；The conjunction of switching device 1 and the road I power switch divides shape
State association, as shown in Figure 1, 2, the association are filled by the cam 5 and switch with the output shaft 4 of operating mechanism synchronous rotation
Set the on/off switch status signal of the 1 interoperation output road I power switch.When the road I power switch closes a floodgate, the rotation triggering of cam 5
Switching device 1, as shown in Fig. 2, the normally-closed contact of switching device 1 is in an off state；When the road automatic change-over I, power supply is opened
When pass, the road II power switch are in bifurcation state or the road II power switch combined floodgate, cam 5 rotates release switch device 1, such as Fig. 1
Shown, the normally-closed contact of switching device 1 is in closed state.
Switching device 2 is associated with the conjunction isloation state of the road II power switch, as shown in Figure 3,4, the association i.e. by with
The on/off switch shape for cam 5 and 2 interoperation of switching device the output road the II power switch that the output shaft 4 of operating mechanism rotates synchronously
State signal.When the road II power switch closes a floodgate, cam 5 rotates trigger switch device 2, as shown in figure 4, switching device 2 is normally closed
Contact is in an off state；It is convex when the road I power switch, the road II power switch are in bifurcation state or the road I power switch closes a floodgate
5 rotation release switch device 2 of wheel, as shown in figure 3, the normally-closed contact of switching device 2 is in closed state.
Switching device 3 is associated with the position of operating mechanism, and the association passes through the boss on the connecting rod 6 of operating mechanism
61 grasp with 3 interoperation output status signal of switching device when automatic change-over ontology, which is in the road I power switch, to close a floodgate
Position 1 should be located at by making mechanism, as shown in Figure 2.When automatic change-over ontology, which is in the road II power switch, to close a floodgate, operating mechanism
Position 2 should be located at, as shown in Figure 4.When automatic change-over ontology, which is in the double quartiles of two-way power switch, to be set, there is the road I electricity
Source switch closes a floodgate, and (road I power switch combined floodgate ready state refers to the road I power supply to the ready two states of the ready and road II power switch combined floodgate
Switch main spring is in combined floodgate energy storage state, when there is the road I power switch switching signal, the road the I electricity in combined floodgate energy storage state
Source switch main spring driving operating mechanism makes the road I power switch close a floodgate；The road II power switch combined floodgate ready state refers to the road II power supply
Switch main spring be in combined floodgate energy storage state, and when the power switch switching signal of the road Dang You II, the II in combined floodgate energy storage state is electric
Power switch main spring driving operating mechanism in road makes the road II power switch close a floodgate), the operating mechanism when road I power switch closes a floodgate ready
Positioned at position 1, as shown in Figure 1.Operating mechanism is located at position 2 when the road II power switch closes a floodgate ready, as shown in Figure 3.Operation machine
When structure is located at position 1,61 trigger switch device 3 of boss, the normally-closed contact of switching device 3 is in an off state, operating mechanism position
When position 2, the normally-closed contact of 61 release switch device 3 of boss, switching device 3 is in closed state.
As shown in figure 5, the controller of the present embodiment includes microprocessor, power-switching circuit, the road I and the road II power detecting
Circuit, driving circuit, human-computer interaction circuit, switch condition detection circuit and operating mechanism position detecting circuit；The road I power supply, II
Power supply is connect with power-switching circuit and power sense circuit, and high voltage signal is converted to low-voltage by power-switching circuit to be believed
It powers after number to other circuits, the high voltage signal of I power supply, II power supply is reduced to weak electric signal and exported extremely by power sense circuit
Microprocessor, microprocessor acquire this weak electric signal, and by calculating judge whether I power supply, II power supply are normal, human-computer interaction electricity
Road includes key, liquid crystal display, is used for parameter setting, inquiry and display, microprocessor with switching device 1,2 by being electrically connected
Switch condition detection circuit detection automatic change-over conjunction isloation state, pass through the operating mechanism being electrically connected with switching device 3
Position detecting circuit detects operating mechanism position, and failure modes diagnostic method detection operating mechanism event through the invention
Barrier, contact adhesion fault carry out malfunction coefficient by liquid crystal display, for users to use.
It closes a floodgate, under the power switch gate-dividing state of the road II in the road I power switch, when controller detects the road I abnormity of power supply,
Driving circuit movement is controlled, under normal circumstances, automatic change-over should be converted to bifurcation state, and the contact of switching device 1 should be closed
Close, operating mechanism be in II power switch combined floodgate it is ready, the contact of switching device 3 should be closed.If controller passes through switching device 3
Detect that operating mechanism is located at position 2, the i.e. contact closure of switching device 3 with operating mechanism position detecting circuit.But controller
The contact close signal of switching device 1 i.e. the separating brake shape of the road I power switch are not detected by switch condition detection circuit
State signal, then decision mechanism-trouble；
Similarly, it closes a floodgate, under the power switch gate-dividing state of the road I in the road II power switch, when controller detects the road II abnormity of power supply
When, control driving circuit movement, under normal circumstances, automatic change-over should be converted to bifurcation state, and 2 contact of switching device should be closed
Close, operating mechanism be in the road I power switch combined floodgate it is ready, the contact of switching device 3 should disconnect.If controller passes through switching device
3 and operating mechanism position detecting circuit detect that operating mechanism is located at position 1, i.e., the contact of switching device 3 disconnects.But controller
By switch condition detection circuit be not detected the road II power switch gate-dividing state signal (i.e. the contact of switching device 2 be close
Conjunction state), then decision mechanism-trouble；
It closes a floodgate, under the power switch gate-dividing state of the road II in the road I power switch, when controller detects the road I abnormity of power supply, control
Driving circuit movement, under normal circumstances, automatic change-over should be converted to bifurcation state, and the contact of switching device 1 should be closed, behaviour
Make mechanism and be in the road II power switch to close a floodgate ready, the i.e. contact closure of switching device 3, if controller passes through 3 He of switching device
Operating mechanism position detecting circuit detects that operating mechanism is located at the position 2(i.e. contact closure of switching device 3) after be returned to position
The contact for setting the i.e. switching device 3 of 1(disconnects), and controller is detected at present by switch condition detection circuit still in the road I electricity
Source switch "on" position (i.e. the contact of switching device 1 is off-state), then be determined as contact adhesion fault；
Similarly, it closes a floodgate, under the power switch gate-dividing state of the road I in the road II power switch, when controller detects the road II abnormity of power supply
When, control driving circuit movement, under normal circumstances, automatic change-over should be converted to bifurcation state, and the contact of switching device 2 is answered
Closure, operating mechanism be in the road I power switch close a floodgate it is ready, i.e., switching device 3 contact disconnect, if controller by switch fill
Set 3 and operating mechanism position detecting circuit detect operating mechanism be located at the i.e. switching device 3 of position 1(contact disconnect) afterwards again return
To position 2(, that is, switching device 3 contact closure), and controller is detected at present by switch condition detection circuit still in II
Road circuit "on" position (i.e. the contact of switching device 2 is off-state), then be determined as contact adhesion fault.
Claims (10)
1. a kind of automatic change-over failure modes diagnostic method, the automatic change-over includes: for controlling first respectively
Power supply, second source access and excision the first power switch, second source switch, and for drive the first power switch and
The operating mechanism of second source switch motion；Under the first power switch "on" position, the operating mechanism is located at first position,
In the case where second source switchs "on" position, the operating mechanism is located at the second position；It is characterized in that, to the first power switch,
The opening and closing state and the location status of operating mechanism of second source switch are measured in real time, according to testing result and according to
Following decision logic carries out classification diagnosis to the failure of automatic change-over:
During controlling the automatic change-over progress power switching operations, the operating mechanism as described in detecting has been in
While position corresponding to the power switch "on" position to be closed a floodgate, detect the power switch for being intended to separating brake still in combined floodgate shape
State, then decision mechanism-trouble；Operating mechanism is right in the power switch "on" position institute to be closed a floodgate of arrival as described in detecting
It is back to another location again behind the position answered, the power switch for being intended to separating brake is detected simultaneously by still in "on" position, then determines to touch
Head adhesion fault.
2. method as described in claim 1, which is characterized in that the divide-shut brake to the first power switch, second source switch
The location status of state and operating mechanism is measured in real time, by switch state respectively with the first power switch, second electricity
The opening and closing state of source switch and associated three switching devices of the location status of operating mechanism are realized.
3. method as claimed in claim 2, which is characterized in that the switching device is microswitch.
4. method as claimed in claim 3, which is characterized in that the microswitch is closed type contact switch.
5. a kind of automatic change-over failure modes diagnostic device, the automatic change-over includes: for controlling first respectively
Power supply, second source access and excision the first power switch, second source switch, and for drive the first power switch and
The operating mechanism of second source switch motion；Under the first power switch "on" position, the operating mechanism is located at first position,
In the case where second source switchs "on" position, the operating mechanism is located at the second position；It is characterized in that, the failure modes diagnosis
Device includes:
First switching-on and switching-off state detection module, is measured in real time for the opening and closing state to the first power switch；
Second source switch state detection module, for being measured in real time to the opening and closing state that second source switchs；
Operating mechanism detection module is measured in real time for the location status to operating mechanism, at least can be to operation machine
Structure is located at first position and the state of the second position is detected；
Breakdown judge module, for according to the first, second switching-on and switching-off state detection module and operating mechanism detection module
Testing result, and classification diagnosis is carried out according to failure of the following decision logic to automatic change-over:
During controlling the automatic change-over progress power switching operations, the operating mechanism as described in detecting has been in
While position corresponding to the power switch "on" position to be closed a floodgate, detect the power switch for being intended to separating brake still in combined floodgate shape
State, then decision mechanism-trouble；Operating mechanism is right in the power switch "on" position institute to be closed a floodgate of arrival as described in detecting
It is back to another location again behind the position answered, the power switch for being intended to separating brake is detected simultaneously by still in "on" position, then determines to touch
Head adhesion fault.
6. device as claimed in claim 5, which is characterized in that the first, second switching-on and switching-off state detection module and operation machine
Structure detection module passes through the position shape with the first power switch, the opening and closing state of second source switch and operating mechanism respectively
The associated switching device of state realizes detection.
7. device as claimed in claim 6, which is characterized in that the switching device is microswitch.
8. device as claimed in claim 7, which is characterized in that the microswitch is closed type contact switch.
9. device as claimed in claim 5, which is characterized in that the device further includes the failure point for being used to indicate breakdown judge module
The fail result indicating module of class diagnostic result.
10. a kind of automatic change-over, comprising: for controlling the first power supply, second source access and the first electricity of excision respectively
Source switch, second source switch, and the operating mechanism for driving the first power switch and second source switch motion；?
Under one power switch "on" position, the operating mechanism is located at first position, in the case where second source switchs "on" position, the behaviour
Make mechanism and is located at the second position；It is characterized in that, the automatic change-over further includes as any one of claim 5 ~ 9 is described automatic
Change-over switch failure modes diagnostic device.
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| CN201910022017.XA CN109633432B (en) | 2019-01-10 | 2019-01-10 | Automatic transfer switch fault classification diagnosis method and device and automatic transfer switch |
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| CN201910022017.XA CN109633432B (en) | 2019-01-10 | 2019-01-10 | Automatic transfer switch fault classification diagnosis method and device and automatic transfer switch |
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| CN111487529A (en) * | 2020-06-01 | 2020-08-04 | 泉州睿郎机电技术有限公司 | Method and device for detecting synchronism of contacts of dual-power transfer switch |
| CN111537875A (en) * | 2020-06-01 | 2020-08-14 | 泉州睿郎机电技术有限公司 | Method and device for collecting and measuring switching time of double-power-supply change-over switch contact |
| CN113178941A (en) * | 2021-04-29 | 2021-07-27 | 国网山东省电力公司安丘市供电公司 | Standby power supply system for intelligent electric energy meter |
| US11567133B2 (en) * | 2019-04-08 | 2023-01-31 | Dexin Electronic Ltd. | Signal detecting circuit and signal detecting method of micro switch |
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| US11567133B2 (en) * | 2019-04-08 | 2023-01-31 | Dexin Electronic Ltd. | Signal detecting circuit and signal detecting method of micro switch |
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| CN111537875A (en) * | 2020-06-01 | 2020-08-14 | 泉州睿郎机电技术有限公司 | Method and device for collecting and measuring switching time of double-power-supply change-over switch contact |
| CN111487529B (en) * | 2020-06-01 | 2021-05-04 | 泉州睿郎机电技术有限公司 | Method and device for detecting synchronism of contacts of dual-power transfer switch |
| CN113178941A (en) * | 2021-04-29 | 2021-07-27 | 国网山东省电力公司安丘市供电公司 | Standby power supply system for intelligent electric energy meter |
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