CN106959416A - A kind of lv contactor contacts status on-Line Monitor Device and method - Google Patents
A kind of lv contactor contacts status on-Line Monitor Device and method Download PDFInfo
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- CN106959416A CN106959416A CN201710276479.5A CN201710276479A CN106959416A CN 106959416 A CN106959416 A CN 106959416A CN 201710276479 A CN201710276479 A CN 201710276479A CN 106959416 A CN106959416 A CN 106959416A
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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 provides a kind of lv contactor contacts status on-Line Monitor Device and method, including wide range voltage detection unit, small-range voltage detection unit, isolated location and main control unit.Wide range voltage detection unit connects main control unit and lv contactor contact both sides, both sides voltage during detection contact disjunction state；Small-range voltage detection unit connects main control unit and by isolated location connecting terminal both sides, both sides voltage during detection contact closure condition；Isolated location, which is realized, quickly isolates and accesses small-range voltage detection unit；Main control unit is also connected with lv contactor controller, and detection lv contactor controller signals and determines contacts status in real time, and judged according to contact both sides voltage contacts status for it is normal or there is virtual connection and void break among one.Implement the present invention, collect paired lv contactor contact and be in division state on_line monitoring function, overcome lv contactor contact from closure state the measurement problem of voltage span greatly into disjunction state procedure.
Description
Technical field
Supervised online the present invention relates to lv contactor detection technique field, more particularly to a kind of lv contactor contacts status
Survey device and method.
Background technology
Lv contactor, which is widely used in, to be needed to frequently switch on the occasion with disjunction, but because lv contactor is frequently opened
Disconnected action, easily causes element and loosens so that contact generation virtual connection or empty disconnected phenomenon, also easily cause contact wear so that contact
Resistance becomes big, cause high current by when because heating increases there is contact melted phenomenon.Therefore, it is necessary to be touched to lv contactor
Dotted state is monitored on-line, so as to the generation for finding and preventing accident in time.
At present, researcher has found that contact both sides voltage is millivolt level during lv contactor normally closed, and is touched after disjunction
Point both sides voltage may be up to several hectovolts, and this allows for contact both sides voltage measurement span greatly, and also found lv contactor
Fringe time and control electromagnetic mechanism actuation time between closure state and disjunction state is shorter, and this allows for monitoring difficulty
It is larger.
However, existing lv contactor contacts status on-Line Monitor Device, otherwise individually to lv contactor contact at
It is monitored in closure state, otherwise individually lv contactor contact is monitored in disjunction state, not only equipment cost
High, complex operation and waste time and energy, can not also overcome lv contactor contact from closure state the voltage into disjunction state procedure
The measurement problem of span greatly.
Therefore, need a kind of lv contactor contacts status on-Line Monitor Device badly, collect paired lv contactor contact and be in
Closure state and disjunction state on_line monitoring function, and lv contactor contact is overcome from closure state to disjunction state procedure
The measurement problem of middle voltage span greatly.
The content of the invention
It is an object of the invention to overcome shortcoming of the prior art with deficiency, there is provided a kind of lv contactor contacts status
On-Line Monitor Device and method, collect paired lv contactor contact and are in closure state and disjunction state on_line monitoring function, and
Overcome lv contactor contact from closure state the measurement problem of voltage span greatly into disjunction state procedure.
In order to solve the above-mentioned technical problem, the embodiments of the invention provide a kind of lv contactor contacts status on-line monitoring
Device, it is engaged with lv contactor, including wide range voltage detection unit, small-range voltage detection unit, isolated location
And main control unit；Wherein,
One end of the wide range voltage detection unit is connected with the main control unit, the other end and the lv contactor contact
Both sides are connected, both sides voltage during for detecting that the lv contactor contact is in disjunction state；
One end of the small-range voltage detection unit is connected with the main control unit, and the other end passes through the isolated location and institute
State lv contactor contact both sides to be connected, both sides voltage during for detecting that the lv contactor contact is in closure state；
The isolated location, for isolating both sides voltage or by closure state when the lv contactor contact is in disjunction state
The overvoltage for turning the instantaneous both sides generation of disjunction state flows through the small-range voltage detection unit, and turns on the low pressure contact
Both sides voltage flows through the small-range voltage detection unit when device contact is in closure state；
Controller of the main control unit also with the lv contactor is connected, the control for detecting the lv contactor in real time
The contact breaking signal and closure signal that device processed is sent determine the lv contactor contact be in closure state or disjunction
State, and receive the wide range voltage detection unit detect when the lv contactor contact is in disjunction state two
Two when side voltage detects that the lv contactor contact is in closure state with the reception small-range voltage detecting to unit
Side voltage judges the closure state or disjunction state residing for the lv contactor contact to be normal or virtual connection occur and empty disconnected
Among one.
Wherein, the isolated location by four high speed photo coupling relay groups into；Wherein, four high speed photo coupling relays
Among two mutually concatenate and be connected with the side of the lv contactor contact, and among four high speed photo coupling relays separately
Two mutually concatenate and are connected with the opposite side of the lv contactor contact.
Wherein, the main control unit is built-in with AD D/A converter modules and contact division signal trigger module；Wherein,
The AD D/A converter modules respectively with the wide range voltage detection unit and the small-range voltage detection unit phase
Even, the transformation for modulus signal；
The contact division signal trigger module is connected with the controller of the lv contactor, for detecting the low pressure in real time
Contact breaking signal and closure signal that the controller of contactor is sent.
Wherein, the lv contactor contacts status on-Line Monitor Device also includes current detecting unit, and the electric current
One end of detection unit is connected with lv contactor contact both sides, the AD digital-to-analogue conversion moulds of the other end and the main control unit
Block is connected, both sides electric current during for detecting that the lv contactor contact is in disjunction state or closure state.
Wherein, the lv contactor contacts status on-Line Monitor Device also includes touch screen display unit, the touch
Screen display unit is connected with the main control unit, for showing that the lv contactor contact is in closure state or disjunction state
And each self-corresponding associated voltage current information, and support the associated voltage current information with numeral, curve and figure respectively
Table shows and can carry out display switching by default button.
Wherein, the lv contactor contacts status on-Line Monitor Device also includes wireless communication unit, the channel radio
Letter unit is connected with the main control unit, for wirelessly realizing data transfer.
Wherein, when the contact close signal that the controller that the main control unit receives the lv contactor is sent
Afterwards, completed through the isolated location certain time-delay lv contactor closing of contact action to be determined, read the small-range
Voltage detecting to unit detect that the lv contactor contact is in closure state when both sides voltage, and judge it is described read it is small
When whether the contact both sides voltage that range voltage detection unit is detected is more than predetermined threshold value, if it is, judging the low pressure
There is virtual connection in contacts of contactor state；If it is not, then judging the lv contactor contacts status as normal closure state；Or
After the contact breaking signal that the controller that the main control unit receives the lv contactor is sent, through it is described every
Lv contactor contact disjunction action to be determined from unit certain time-delay is completed, and reads the wide range voltage detecting to list
The member detection lv contactor contact is in both sides voltage during disjunction state, and judges the reading wide range voltage detecting
When whether the contact both sides voltage that unit is detected is less than the predetermined threshold value, if it is, judging that the lv contactor is touched
Dotted state occurs empty disconnected；If it is not, then judging the lv contactor contacts status as normal disjunction state.
The embodiment of the present invention additionally provides a kind of lv contactor contacts status on-line monitoring method, and it is in foregoing low pressure
Realized in contacts of contactor state on_line monitoring device, methods described includes：
S1, detection lv contactor contact current state, the state include closure state and disjunction state；
S2, the lv contactor contact current state detected according to, select the lv contactor contacts status online
Wide range voltage detection unit or small-range voltage detection unit in monitoring device, obtain the current shape in lv contactor contact
Both sides voltage during state, and got according to described lv contactor contact current state when both sides voltage, it is determined that described
Lv contactor contact current state for it is normal or occur virtual connection and it is empty it is disconnected among one.
Wherein, the step S2 is specifically included：
When detecting lv contactor contact current state for closure state, select the lv contactor contacts status online
Small range voltage detection unit obtains the both sides voltage when lv contactor contact is in closure state in monitoring device；
Whether the both sides voltage when lv contactor contact got described in judging is in closure state is less than predetermined threshold value；
If it is, lv contactor contact current state is judged to be normal, and in closure state；If it is not, then sentencing
There is virtual connection in fixed lv contactor contact current state.
Wherein, the step S2 is also further specifically included：
When detecting lv contactor contact current state for disjunction state, select the lv contactor contacts status online
Wide range voltage detection unit obtains the both sides voltage when lv contactor contact is in disjunction state in monitoring device；
Whether the both sides voltage when lv contactor contact got described in judging is in disjunction state is less than the default threshold
Value；
If it is, it is empty disconnected to judge that lv contactor contact current state occurs；If it is not, then judging the low pressure contact
Device contact current state is normal, and in disjunction state.
Compared with prior art, the invention has the advantages that and beneficial effect：
Compared with conventional low contacts of contactor state on_line monitoring device, embodiment of the present invention mesolow contacts of contactor state
There is on-Line Monitor Device wide range voltage detection unit and small-range voltage detection unit to be used for detecting lv contactor contact
Both sides voltage under disjunction state or closure state, is in closure state to lv contactor contact and divides so as to be integrated with
The on-line monitoring function of disconnected state, reduces equipment cost and operation complexity, time saving and energy saving, while using isolated location to small
Range voltage detection unit, which is quickly accessed and isolated, realizes overvoltage protection, overcome lv contactor contact from closure state to point
The measurement problem of voltage span greatly in disconnected state procedure.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is a structural representation of the lv contactor contacts status on-Line Monitor Device provided in the embodiment of the present invention
Figure；
Fig. 2 is the applied field of isolated location in the lv contactor contacts status on-Line Monitor Device that provides in the embodiment of the present invention
Jing Tu；
Fig. 3 is the system structure diagram of main control unit in Fig. 1；
Fig. 4 is another structural representation of the lv contactor contacts status on-Line Monitor Device provided in the embodiment of the present invention；
Fig. 5 is the another structural representation of the lv contactor contacts status on-Line Monitor Device provided in the embodiment of the present invention；
Fig. 6 is the flow chart of the lv contactor contacts status on-line monitoring method provided in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
As shown in figure 1, in the embodiment of the present invention, a kind of lv contactor contacts status on-Line Monitor Device of proposition and
Method, itself and lv contactor（It is not shown）It is engaged, including wide range voltage detection unit 1, small-range voltage detection unit
2nd, isolated location 3 and main control unit 4；Wherein,
One end of wide range voltage detection unit 1 is connected with main control unit 4, and the other end is connected with lv contactor contact M both sides,
Both sides voltage during for detecting that lv contactor contact M is in disjunction state；
One end of small-range voltage detection unit 2 is connected with main control unit 4, and the other end passes through isolated location 3 and lv contactor
Contact M both sides are connected, both sides voltage during for detecting that lv contactor contact M is in closure state；
Isolated location 3, for isolating when lv contactor contact M is in disjunction state both sides voltage or by closure state turning disjunction
The overvoltage that the instantaneous both sides of state are produced flows through small-range voltage detection unit 2, and conducting lv contactor contact M is in and closed
Both sides voltage flows through small-range voltage detection unit 2 during conjunction state；
Main control unit 4 is also connected with the controller of lv contactor, and the controller for detecting lv contactor in real time is sent
Contact breaking signal and closure signal come determine lv contactor contact M be in closure state or disjunction state, and receive
Wide range voltage detection unit 1 detects both sides voltage when lv contactor contact M is in disjunction state and receives small-range
Voltage detecting to unit 2 detect that lv contactor contact M is in closure state when both sides voltage judge the low pressure contact
Closure state or disjunction state residing for the M of device contact for it is normal or occur virtual connection and it is empty it is disconnected among one.
It should be noted that when lv contactor contact M normally closeds, it is necessary to be entered with small-range voltage detection unit 2
Row measurement, and when the normal disjunctions of lv contactor contact M, it is necessary to be measured with wide range voltage detection unit 1.If but with
Contact M both sides voltage, contact M disjunction moments, if small-range is electric during the measurement lv contactor closure of small-range voltage detection unit 2
Pressure detection unit 2 is still accessed in contact both sides, then the overvoltage that contact M disjunctions moment produces is easily by small-range voltage detecting list
Member 2 is burnt out, therefore small-range voltage detection unit 2 must be completely isolated with contact both sides when being in disjunction state by contact M.
Situation the most extreme is being accessed during the both sides of contact for small-range voltage detection unit 2, lv contactor
Controller sends contact disjunction order suddenly, because the actuation time of existing lv contactor electromagnetic mechanism is most 0.5ms soon, therefore
For lv contactor, disjunction is most 0.5ms soon since being sent contact disjunction order to contact.In view of feelings the most extreme
Condition, this requires to allow for realize small-range voltage detection unit 2 and low pressure contact by isolated location 3 within 0.5ms
Device contact M both sides it is completely isolated.In one embodiment, isolated location 3 by four high speed photo coupling relay groups into and adopting
Among model AQW216A, four high speed photo coupling relays two mutually concatenation and with lv contactor contact M side phase
Connect, and another two is mutually concatenated and is connected with lv contactor contact M opposite side among four high speed photo coupling relays.
As shown in Fig. 2 to isolated location 3 in the lv contactor contacts status on-Line Monitor Device in the embodiment of the present invention
Application scenarios be described further：
Isolated location 3 by tetra- high speed photo coupling relay groups of a, b, c, d into, wherein, high speed photo coupling relay a, b concatenation after with it is low
The side for crimping tentaculum contact M is connected, and is connected after high speed photo coupling relay c, d concatenation with lv contactor contact M opposite side.
（I）When lv contactor contact M is in disjunction state, high speed photo coupling relay module a, b, c, d are in all the time
Disjunction state.
（II）When lv contactor contact M is in closure state, high speed photo coupling relay a, c are first turned on, delay 2ms is treated
High speed photo coupling relay a, c are closed completely, if receiving the contact disjunction that lv contactor controller is sended over during this period
Order, then after high speed photo coupling relay a, c are closed completely, disconnect high speed photo coupling relay a, c and stop contact immediately
Voltage measurement；Or
If being not received by the contact disjunction order that lv contactor controller is sended over during this period, high speed photo coupling is turned on
Relay b, d, then in high speed photo coupling relay b, d in turn on process, point following several situations：
（a1）If receiving the contact disjunction order that lv contactor controller is sended over, high speed photo coupling relay is disconnected immediately
Device a, c, realization are completely isolated by small-range voltage detection unit 2 and lv contactor contact M both sides in 0.2ms, then treat
After high speed photo coupling relay b, d closure completely, high speed photo coupling relay b, d is disconnected immediately and stops contact voltage measurement；
（a2）If being not received by the contact disjunction order that lv contactor controller is sended over, small-range voltage detection unit
2 will be linked into contact both sides, and it is contact voltage that small-range voltage detection unit 2, which surveys voltage value,.Now, in a small amount
Journey voltage detection unit 2 is also in measurement process, if receiving the contact disjunction order that lv contactor controller is sended over,
High speed photo coupling relay a, b, c, d are then disconnected immediately, are realized small-range voltage detection unit 5 and low pressure contact in 0.2ms
Device contact M both sides are completely isolated；If the contact disjunction order that lv contactor controller is sended over is not received by, through one
Determine after the setting time, disconnect high speed photo coupling relay a, b, c, d, small-range voltage detection unit 2 and lv contactor contact M two
Side is completely isolated, and contact voltage measurement terminates.
In embodiments of the present invention, main control unit 4 judges that lv contactor contacts status detailed process is as follows：
（1）After the contact close signal that the controller that main control unit 4 receives lv contactor is sent, through isolated location 3
Certain time-delay lv contactor contact M closed actions to be determined are completed, and are read small-range voltage detecting and are connect to the detection of unit 2 low pressure
Tentaculum contact M is in both sides voltage during closure state, and judges the contact that read small-range voltage detection unit 2 is detected
When both sides voltage is more than predetermined threshold value, judge that virtual connection occurs in lv contactor contact M state.Certainly, if now judging to be read
The contact both sides voltage swing that small-range voltage detection unit 2 is detected judges lv contactor contact M shapes when predetermined threshold value
State is normal closure state.
（2）It is single through isolation after the contact breaking signal that the controller that main control unit 4 receives lv contactor is sent
First 3 certain time-delays M disjunctions action in lv contactor contact to be determined is completed, and is read wide range voltage detecting and is detected low to unit 1
Both sides voltage when tentaculum contact M is in disjunction state is crimped, and judges what read wide range voltage detection unit 1 was detected
When contact both sides voltage is less than predetermined threshold value, judge that lv contactor contact M state occurs empty disconnected.Certainly, if now judging institute
When the contact both sides voltage that reading wide range voltage detection unit 1 is detected is more than predetermined threshold value, lv contactor contact M is judged
State is normal disjunction state.
As shown in figure 3, in order to realize the conversion of internal/external signal and determine the division state of lv contactor, therefore in master
Control unit 4 is built-in with AD D/A converter modules 41 and contact division signal trigger module 42；Wherein, 41 points of AD D/A converter modules
It is not connected with wide range voltage detection unit 1 and small-range voltage detection unit 2, the transformation for modulus signal；Contact division
Signal trigger module 42 is connected with the controller of lv contactor, for detecting what the controller of lv contactor was sent in real time
Contact breaking signal and closure signal.
As shown in figure 4, the voltage detecting in order to coordinate wide range voltage detection unit 1 and small-range voltage detection unit 2,
Also further determine that whether lv contactor contacts status is normal by current detecting, therefore lv contactor contacts status exists
Line monitoring device also includes current detecting unit 5, and one end of current detecting unit 5 is connected with lv contactor contact M both sides,
The other end is connected with the AD D/A converter modules 41 of main control unit 4, for detect lv contactor contact M be in disjunction state or
Both sides electric current during closure state.
It should be noted that the electric current and wide range voltage detection unit 1 and small-range surveyed by current detecting unit 5
The voltage that voltage detection unit 2 is surveyed is coordinated, further evidence lv contactor contacts status.Such as lv contactor contact
After the completion of M closed actions, the contact both sides voltage that small-range voltage detection unit 2 is detected is more than predetermined threshold value, and now electric
Flow detection unit 5 and be less than its setting value, it is determined that virtual connection occurs in lv contactor contact M state；Similarly, lv contactor contact
After the completion of M disjunctions action, the contact both sides voltage that wide range voltage detection unit 1 is detected is less than predetermined threshold value, and now electric
Flow detection unit 5 and be higher than its setting value, it is determined that lv contactor contact M state occurs empty disconnected.
As shown in figure 5, lv contactor contacts status on-Line Monitor Device also includes touch screen display unit 6 and channel radio
Believe unit 7；Wherein, touch screen display unit 6 is connected with main control unit 4, for showing that lv contactor contact M is in closed form
State or disjunction state and respectively each self-corresponding associated voltage current information, and support associated voltage current information with numeral,
Curve and chart show and can carry out display switching by default button；Wherein, wireless communication unit 7 and the phase of main control unit 4
Even, for wirelessly realizing data transfer.
In one embodiment, wide range voltage detection unit 1 and small-range voltage detection unit 2 by dsp chip and
Its peripheral circuit is formed；Isolated location 3 by four model AQW216A high speed photo coupling relay group into；Main control unit 4 is used
Single-chip microcomputer, it is formed by ARM chips and its peripheral circuit；Current detecting unit 5 is also formed by dsp chip and its peripheral circuit；
Touch screen display unit 6 uses the controllable touch-screen of condenser type；Wireless communication unit 7 has wifi, Zigbee, 3G, 4G, bluetooth etc.
Radio communication submodule.
As shown in fig. 6, in the embodiment of the present invention there is provided a kind of lv contactor contacts status on-line monitoring method,
It realizes that methods described includes in foregoing lv contactor contacts status on-Line Monitor Device：
Step S1, detection lv contactor contact current state, the state include closure state and disjunction state；
Detailed process is that difference lv contactor contact current state is closure state or disjunction state, to be connect according to low pressure
Tentaculum contact current state, reads the lv contactor contact both sides voltage that different voltage detection units are collected.
Step S2, the lv contactor contact current state detected according to, select the lv contactor contact
Wide range voltage detection unit or small-range voltage detection unit in state on_line monitoring device, obtain the lv contactor and touch
Both sides voltage during point current state, and got according to described lv contactor contact current state when both sides voltage,
Judge lv contactor contact current state as it is normal or occur virtual connection and it is empty it is disconnected among one.
Detailed process is, according to lv contactor contact current state, and the different range voltage detection units of selection correspondence are adopted
Collect lv contactor contact both sides voltage, and judge whether lv contactor contacts status is normal or breaks down with this, if
Break down, also further fault category judged, such as occur virtual connection and it is empty break among first, detailed process is according to low pressure
The following two situations of contacts of contactor current state point：
（1）When detecting lv contactor contact current state for closure state, the lv contactor contacts status is selected
Small range voltage detection unit obtains the both sides electricity when lv contactor contact is in closure state in on-Line Monitor Device
Pressure；
Whether the both sides voltage when lv contactor contact got described in judging is in closure state is less than predetermined threshold value；
If it is, lv contactor contact current state is judged to be normal, and in closure state；If it is not, then sentencing
There is virtual connection in fixed lv contactor contact current state.
（2）When detecting lv contactor contact current state for disjunction state, the lv contactor contact is selected
Wide range voltage detection unit obtains two when the lv contactor contact is in disjunction state in state on_line monitoring device
Side voltage；
Whether the both sides voltage when lv contactor contact got described in judging is in disjunction state is less than the default threshold
Value；
If it is, it is empty disconnected to judge that lv contactor contact current state occurs；If it is not, then judging the low pressure contact
Device contacts status is currently normal, and in disjunction state.
Compared with prior art, the invention has the advantages that and beneficial effect：
Compared with conventional low contacts of contactor state on_line monitoring device, embodiment of the present invention mesolow contacts of contactor state
There is on-Line Monitor Device wide range voltage detection unit and small-range voltage detection unit to be used for detecting lv contactor contact
Both sides voltage under disjunction state or closure state, is in closure state to lv contactor contact and divides so as to be integrated with
The on-line monitoring function of disconnected state, reduces equipment cost and operation complexity, time saving and energy saving, while using isolated location to small
Range voltage detection unit, which is quickly accessed and isolated, realizes overvoltage protection, overcome lv contactor contact from closure state to point
The measurement problem of voltage span greatly in disconnected state procedure.
Above-described embodiment is preferably embodiment, but embodiments of the present invention are not by above-described embodiment of the invention
Limitation, other any Spirit Essences without departing from the present invention and the change made under principle, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (10)
1. a kind of lv contactor contacts status on-Line Monitor Device, it is engaged with lv contactor, it is characterised in that including
Wide range voltage detection unit, small-range voltage detection unit, isolated location and main control unit；Wherein,
One end of the wide range voltage detection unit is connected with the main control unit, the other end and the lv contactor contact
Both sides are connected, both sides voltage during for detecting that the lv contactor contact is in disjunction state；
One end of the small-range voltage detection unit is connected with the main control unit, and the other end passes through the isolated location and institute
State lv contactor contact both sides to be connected, both sides voltage during for detecting that the lv contactor contact is in closure state；
The isolated location, for isolating both sides voltage or by closure state when the lv contactor contact is in disjunction state
The overvoltage for turning the instantaneous both sides generation of disjunction state flows through the small-range voltage detection unit, and turns on the low pressure contact
Both sides voltage flows through the small-range voltage detection unit when device contact is in closure state；
Controller of the main control unit also with the lv contactor is connected, the control for detecting the lv contactor in real time
The contact breaking signal and closure signal that device processed is sent determine the lv contactor contact be in closure state or disjunction
State, and receive the wide range voltage detection unit detect when the lv contactor contact is in disjunction state two
Two when side voltage detects that the lv contactor contact is in closure state with the reception small-range voltage detecting to unit
Side voltage judges the closure state or disjunction state residing for the lv contactor contact to be normal or virtual connection occur and empty disconnected
Among one.
2. lv contactor contacts status on-Line Monitor Device as claimed in claim 1, it is characterised in that the isolated location
By four high speed photo coupling relay groups into；Wherein, among four high speed photo coupling relays two mutually concatenation and with it is described low
The side for crimping tentaculum contact is connected, and another two is mutually concatenated and connect with the low pressure among four high speed photo coupling relays
The opposite side of tentaculum contact is connected.
3. lv contactor contacts status on-Line Monitor Device as claimed in claim 2, it is characterised in that the main control unit
It is built-in with AD D/A converter modules and contact division signal trigger module；Wherein,
The AD D/A converter modules respectively with the wide range voltage detection unit and the small-range voltage detection unit phase
Even, the transformation for modulus signal；
The contact division signal trigger module is connected with the controller of the lv contactor, for detecting the low pressure in real time
Contact breaking signal and closure signal that the controller of contactor is sent.
4. lv contactor contacts status on-Line Monitor Device as claimed in claim 3, it is characterised in that the low pressure contact
Device contacts status on-Line Monitor Device also includes current detecting unit, and one end of the current detecting unit connects with the low pressure
Tentaculum contact both sides are connected, and the other end is connected with the AD D/A converter modules of the main control unit, for detecting that the low pressure connects
Tentaculum contact is in both sides electric current when disjunction state or closure state.
5. lv contactor contacts status on-Line Monitor Device as claimed in claim 4, it is characterised in that the low pressure contact
Device contacts status on-Line Monitor Device also includes touch screen display unit, the touch screen display unit and the main control unit phase
Even, for showing that the lv contactor contact is in closure state or disjunction state and respectively each self-corresponding associated voltage
Current information, and support that the associated voltage current information is shown and can entered by default button with numeral, curve and chart
Row display switching.
6. lv contactor contacts status on-Line Monitor Device as claimed in claim 5, it is characterised in that the low pressure contact
Device contacts status on-Line Monitor Device also includes wireless communication unit, and the wireless communication unit is connected with the main control unit,
For wirelessly realizing data transfer.
7. lv contactor contacts status on-Line Monitor Device as claimed in claim 6, it is characterised in that when the master control list
After the contact close signal that the controller that member receives the lv contactor is sent, treated through the isolated location certain time-delay
Determine that the lv contactor closing of contact action is completed, read the small-range voltage detecting and detect that the low pressure connects to unit
Tentaculum contact is in both sides voltage during closure state, and judges the contact that the reading small-range voltage detection unit is detected
When whether both sides voltage is more than predetermined threshold value, if it is, judging that virtual connection occurs in the lv contactor contacts status；If
It is no, then judge the lv contactor contacts status as normal closure state；Or
After the contact breaking signal that the controller that the main control unit receives the lv contactor is sent, through it is described every
Lv contactor contact disjunction action to be determined from unit certain time-delay is completed, and reads the wide range voltage detecting to list
The member detection lv contactor contact is in both sides voltage during disjunction state, and judges the reading wide range voltage detecting
When whether the contact both sides voltage that unit is detected is less than the predetermined threshold value, if it is, judging that the lv contactor is touched
Dotted state occurs empty disconnected；If it is not, then judging the lv contactor contacts status as normal disjunction state.
8. a kind of lv contactor contacts status on-line monitoring method, it is characterised in that it is in such as any one of claim 1-7
Realized in described lv contactor contacts status on-Line Monitor Device, methods described includes：
S1, detection lv contactor contact current state, the state include closure state and disjunction state；
S2, the lv contactor contact current state detected according to, select the lv contactor contacts status online
Wide range voltage detection unit or small-range voltage detection unit in monitoring device, obtain the current shape in lv contactor contact
Both sides voltage during state, and got according to described lv contactor contact current state when both sides voltage, judge described
Lv contactor contact current state for it is normal or occur virtual connection and it is empty it is disconnected among one.
9. lv contactor contacts status on-line monitoring method as claimed in claim 8, it is characterised in that the step S2 tools
Body includes：
When detecting lv contactor contact current state for closure state, select the lv contactor contacts status online
Small range voltage detection unit obtains the both sides voltage when lv contactor contact is in closure state in monitoring device；
Whether the both sides voltage when lv contactor contact got described in judging is in closure state is less than predetermined threshold value；
If it is, lv contactor contact current state is judged to be normal, and in closure state；If it is not, then sentencing
There is virtual connection in fixed lv contactor contact current state.
10. lv contactor contacts status on-line monitoring method as claimed in claim 9, it is characterised in that the step S2
Also further specifically include：
When detecting lv contactor contact current state for disjunction state, select the lv contactor contacts status online
Wide range voltage detection unit obtains the both sides voltage when lv contactor contact is in disjunction state in monitoring device；
Whether the both sides voltage when lv contactor contact got described in judging is in disjunction state is less than the default threshold
Value；
If it is, it is empty disconnected to judge that lv contactor contact current state occurs；If it is not, then judging the low pressure contact
Device contact current state is normal, and in disjunction state.
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