CN105470941B - A kind of safety closing device for 10kv step-down transformer - Google Patents
A kind of safety closing device for 10kv step-down transformer Download PDFInfo
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- CN105470941B CN105470941B CN201510908220.9A CN201510908220A CN105470941B CN 105470941 B CN105470941 B CN 105470941B CN 201510908220 A CN201510908220 A CN 201510908220A CN 105470941 B CN105470941 B CN 105470941B
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- down transformer
- insulation resistance
- transformer
- mcu
- high voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/005—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of too low isolation resistance, too high load, short-circuit; earth fault
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
Abstract
The present invention relates to a kind of safety closing devices for 10kv step-down transformer, belong to transmission of electricity power supply unit field.Including relay, electromagnetic lock, Insulation Resistance Tester and controller, Insulation Resistance Tester includes line end, ground terminal, signal end and shielding end, and the line end of Insulation Resistance Tester is connected by relay with the output end of 10kv step-down transformer, shielding end connect transformer shell, ground terminal is grounded；Controller controls the opening and closing of Insulation Resistance Tester, relay or solenoid valve and receives the detection signal of Insulation Resistance Tester；Electromagnetic lock is arranged on the switch of 10kv step-down transformer primary side and for locking or unlocking to the off-state of the switch.The present apparatus is applicable not only to coming into operation for the transformer of new production, meanwhile, suitable for the improvement and installation of existing 10kv transformer, enhance the versatility and safety of transformer, the security risk of less 10kv power grid.
Description
Technical field
The present invention relates to a kind of safety closing devices for 10kV step-down transformer, belong to transmission of electricity power supply unit field.
Background technique
Transformer is by iron core（Or magnetic core）It is formed with coil, there are two coils or more than two windings, wherein connecing power supply
Winding primary coil, remaining winding is secondary coil.It can convert alternating voltage, electric current and impedance.It is simplest
It iron core that iron-core transformer is made by a soft magnetic materials and covers the coil of two the number of turns on iron core not etc. and constitutes.Insulated electro
Hinder the insulation performance between each coil of indication transformer, between each coil and iron core.The height of insulation resistance with it is used absolutely
The performance of edge material, temperature height are related with moist degree.
10kV transformer is when being powered, probably due to person works' fault or other factors cause the circuit of transformer short
The transformer short-circuit on road or its load patch is easy to cause safety accident；Especially for the 10kV transformer of outdoor application, by
In its power supply line head, maintenance cycle is long, is easy to cause when being powered since the circuit isolation resistance of transformer or its power supply is short
Safety accident influences power grid security.
Summary of the invention
It is an object of the invention to：In view of the above problems, a kind of safety for 10kV step-down transformer is provided
Closing device, present apparatus structure is simple, easy to use, has stronger generalization, is applicable not only to the transformer of new production
It comes into operation, meanwhile, suitable for the improvement and installation of existing 10kV transformer, enhance the versatility and safety of transformer, it is less
The security risk of 10kV power grid.The present apparatus be suitable for cell or open air 10kV step-down transformer, can effectively reduce because
The safety of transformer itself insulating properties less harmful power grid and transformer, while being also avoided that the exhausted of with transformer its cable being connected
The low safety for influencing equipment of edge, it is effective to guarantee that 10kV step-down transformer normally uses.
The technical solution adopted by the present invention is as follows：
The invention discloses a kind of safety closing device for 10kV step-down transformer, including relay, electromagnetic lock, absolutely
Edge resistance meter and controller, Insulation Resistance Tester include line end, ground terminal, signal end and shielding end, megger test
The line end of instrument is connected by relay with the output end of 10kV step-down transformer, and shielding end connects transformer shell, ground terminal ground connection；
Controller controls the opening and closing of Insulation Resistance Tester, relay or solenoid valve and receives the detection signal of Insulation Resistance Tester；
Electromagnetic lock is arranged on the switch of 10kV step-down transformer primary side and for locking or unlocking to the off-state of the switch.
Further, the switch is high voltage isolator, and the high voltage isolator is by the way of machinery opening and closing, the height
Pressing disconnecting switch includes moving knife, stationary knife, knife rest, and moving knife and stationary knife pass through insulation column respectively and are connected on knife rest, connect on moving knife
It is connected to transmission shaft, the transmission shaft is for controlling closing or opening for moving knife.
Further, the electromagnetic lock is fixed on knife rest, and the electromagnetic lock is by locking transmission shaft for high voltage isolator
Off-state lock or unlock.
Further, the controller is powered using 12V storage battery, which is electrically connected by transformer and city.
Further, the 10kV step-down transformer output end connect having air switch, the output end of air switch with
Load is connected.
Further, the 10kV step-down transformer passes sequentially through high voltage isolator, breaker, high voltage isolator and connects
It is connected to 10kV power grid.
Further, the controller includes MCU, display, keyboard and communicator；MCU respectively with display, keyboard
And communicator is connected.
Due to above structure, Insulation Resistance Tester is connected in the secondary side of 10kV step-down transformer, it can be in transformer
The insulating properties of transformer is detected before being powered, guarantees the safety of transformer in use, guarantees that transformer is powered
When safety, it is effective to guarantee that transformer says the safety in power grid；When the insulation resistance size of transformer does not meet energization
Regulation when, by its controller control electromagnetic lock movement, electromagnetic lock locking be set to transformer on front side of switch, close it can not
It closes, can effectively ensure that transformer is powered in the case where good insulating, it is defeated especially suitable for outdoor 10kV input and 220V
Step-down transformer out, this application scenarios can guarantee that equipment completes the detection of insulation resistance before energization, avoid due to becoming
Depressor insulating properties is bad and the case where causing grid short circuit, guarantee the safety of equipment, lock of the disconnecting switch as electromagnetic lock
Determine mechanism, is that the distance due to disconnecting switch apart from step-down transformer is minimum, it being capable of the less mistake because of electromagnetic lock control route
The defect that progress ground is controlled caused by length, guarantees the safety of its electromagnetic lock used, can guarantee the normal use of equipment, this
The controller of device uses independent power supply, can be avoided the usability that equipment is influenced because of the route power-off of remote power feeding,
The controller of the present apparatus uses the control of MCU, and the unlock resistance value of electromagnetic lock can be set as needed, and the present apparatus is cell confession
When electric, the safety in utilization of transformer and its cell route is detected, cell fire is prevented, avoids the power grid environment because of cell complexity
And influence the safety of step-down transformer used and influence 10kV power grid.
Further, safety closing system includes：
Control unit, including MCU, display, keyboard and communicator；MCU respectively with display, keyboard and communicator phase
Even；
Power grid unit, including it is 10kV power grid, high voltage isolator, breaker, 10kV step-down transformer, air switch, negative
It carries, 10kV power grid is connected by high voltage isolator and breaker with the primary side of 10kV step-down transformer, 10kV downconverter
The secondary side of device is connected by air switch with load；
Resistance detection unit, including relay, controller, Insulation Resistance Tester, Insulation Resistance Tester include line end,
Ground terminal, signal end and shielding end, the line end of Insulation Resistance Tester pass through the output end phase of relay and 10kV step-down transformer
Even, shielding end connection transformer shell, ground terminal ground connection；Controller is believed with the control terminal of relay, Insulation Resistance Tester respectively
Number end be connected, controller control Insulation Resistance Tester or relay opening and closing and receive Insulation Resistance Tester detection letter
Number；
Electromagnetism lock unit, including electromagnetic lock, electromagnetic lock are arranged on high voltage isolator with lock house, electromagnetic lock, the height
Press disconnecting switch by the way of machinery opening and closing, which includes moving knife, stationary knife, knife rest, and moving knife and stationary knife are distinguished
It is connected on knife rest by insulation column, transmission shaft is connected on moving knife, the transmission shaft is for controlling closing or opening for moving knife；
It is provided with through-hole or blind hole on transmission shaft, when high voltage isolator off-state, the through-hole or blind hole on transmission shaft are opposite；It should
The collapsing length of the lock house of electromagnetic lock is 4-6cm；
Load unit, including air switch and load, the secondary side phase of air switch input terminal and 10kV step-down transformer
Even, output end is connected with load；
For control unit respectively with resistance detection unit and electromagnetism lock unit, control unit judges that resistance detection unit detects
Insulating resistance value whether reach setting value, the off-state of the locking of control electromagnetism lock unit or unlock high voltage isolator.
Due to above system, electromagnetism lock unit, resistance detection unit interoperation are controlled by MCU, to transformer output end
The detection that insulation resistance is carried out in load condition and light condition, when the detected value of insulation resistance does not meet the regulation of setting
Extremely, the high voltage isolator of transformer primary side is locked as off-state and effectively guarantees the safety being powered, avoid insulating
Property not high transformer when accessing power grid, influence the safety of 10kV power grid, this system is more depressurized to suitable for 10kV
The step-down transformer of 220V, especially for the step-down transformer of cell power supply, due to the complex circuit of cell power grid, in cell
Circuit be easy to cause short circuit, and in this case, the necessity that Insulation monitoring is carried out before accessing power grid, which has just highlighted, to be come out, can
Guarantee the normal use of equipment, guarantees the safety of 10kV step-down transformer access.
Further, the control method of safety closing system：
Step 1：The high voltage isolator and breaker for detecting the primary side of 10kV step-down transformer are in an off state, and are examined
The air switch for surveying the secondary side of 10kV step-down transformer disconnects；
Step 2：High voltage isolator is simultaneously locked as off-state by MCU control electromagnetism valve events；
Step 3：MCU controls relay closure, while controlling Insulation Resistance Tester starting, detects 10kV step-down transformer
The insulation resistance of light condition；The insulation resistance numerical value that Insulation Resistance Tester detects is sent to MCU and by being connected with MCU
Display show；
Step 4：When the insulation resistance of 10kV step-down transformer light condition is less than 900 megaohms, MCU passes through coupled
Communicator send alarm signal；When the insulation resistance of 10kV step-down transformer light condition is not less than 900 megaohms, MCU is closed
Relay and Insulation Resistance Tester are closed, electric discharge 1-2s then is carried out to the secondary side of 10kV step-down transformer；
Step 5：It is closed the air switch of the secondary side of 10kV step-down transformer, MCU controls relay closure, controls simultaneously
Insulation Resistance Tester starting, detects the insulation resistance of 10kV step-down transformer load condition；
Step 6：When the insulation resistance of 10kV step-down transformer load condition is less than 200 megaohms, MCU passes through coupled
Communicator send alarm signal；When the insulation resistance of 10kV step-down transformer load condition is not less than 200 megaohms, MCU is closed
Relay and Insulation Resistance Tester are closed, then to the secondary side electric discharge 1-1.5s of 10kV step-down transformer；
Step 7：The insulation resistance that Insulation Resistance Tester detects 10kV step-down transformer load condition is not less than 200,000,000
Europe, light condition insulation resistance be not less than 900 megaohms when, MCU control solenoid valve to high voltage isolator unlock, can
Closure；
Step 8：The air switch of 10kV step-down transformer secondary side is disconnected, 10kV step-down transformer one is then successively closed
Then high voltage isolator, the breaker of secondary side are closed the air switch of 10kV step-down transformer secondary side, and provide for load
Electricity consumption.
Due to using the above method, measurement 10kV transformer its insulation resistance in the case where zero load is greater than 900 megaohms,
It avoids the insulating properties of 10kV step-down transformer itself inadequate, and endangers the safety of 10kV power grid, after completion, detection 10kV becomes
Depressor is greater than 200 megaohms, can guarantee in load end with the insulation resistance in the case where load, the resistance value of insulation resistance
Insulating properties on cable improves the safe handling of equipment, in addition, the present apparatus can also pacify existing 10kV transformer
Dress, is conducive to the popularization of the present apparatus.
In conclusion by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1, present apparatus structure is simple, easy to use, has stronger generalization, is applicable not only to the transformer of new production
It comes into operation, meanwhile, suitable for the improvement and installation of existing 10kV transformer, enhance the versatility and safety of transformer, it is less
The security risk of 10kV power grid.
2, the present apparatus is suitable for the 10kV step-down transformer of cell or open air, can effectively reduce because of transformer itself
The safety of insulating properties less harmful power grid and transformer, while being also avoided that the low influence of the insulating properties of its cable being connected with transformer
The safety of equipment, it is effective to guarantee that 10kV step-down transformer normally uses.
3, the present apparatus carries out Insulation monitoring between each be powered, after the cable or transformer after avoiding maintenance are powered
The situation of short circuit, avoids the safe handling of equipment.
Detailed description of the invention
Fig. 1 is the safety closing system construction drawing that 10kV step-down transformer is used in the present invention；
It is marked in figure：1-10kV power grid, 2- breaker, 3- high voltage isolator, 4- electromagnetic lock, 5-10kV step-down transformer
5,6- controllers, 7- relay, 8- Insulation Resistance Tester, 9- air switch, 10- load.
Specific embodiment
With reference to the accompanying drawing, the present invention is described in detail.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Specific embodiment 1：
As shown in Figure 1, a kind of safety closing device for 10kV step-down transformer of the invention, including relay 7, electricity
Magnetic padlock 4, Insulation Resistance Tester 8 and controller 6, Insulation Resistance Tester 8 include line end, ground terminal, signal end and shield end,
The line end of Insulation Resistance Tester 8 is connected by relay 7 with the output end of 10kV step-down transformer 5, and shielding end connects transformation
Device shell, ground terminal ground connection；Controller 6 controls the opening and closing of Insulation Resistance Tester 8, relay 7 or solenoid valve and receives insulated electro
Hinder the detection signal of tester 8；Electromagnetic lock 4 is arranged on the switch of 5 primary side of 10kV step-down transformer and for the switch
Off-state lock or unlock.Switch is high voltage isolator 3, which, should by the way of machinery opening and closing
High voltage isolator 3 includes moving knife, stationary knife, knife rest, and moving knife and stationary knife pass through insulation column respectively and be connected on knife rest, on moving knife
It is connected with transmission shaft, the transmission shaft is for controlling closing or opening for moving knife.Electromagnetic lock 4 is fixed on knife rest, and the electromagnetic lock 4 is logical
Locking transmission shaft is crossed to lock or unlock the off-state of high voltage isolator 3.Controller 6 is powered using 12V storage battery, the storage battery
It is electrically connected by transformer and city.The output end of 10kV step-down transformer 5 connects having air switch 9, the output end of air switch 9
It is connected with load 10.10kV step-down transformer 5 passes sequentially through high voltage isolator 3, breaker 2, high voltage isolator 3 and is connected to
10kV power grid 1.Controller 6 includes MCU, display, keyboard and communicator；MCU respectively with display, keyboard and communicator phase
Even.
Due to above structure, Insulation Resistance Tester 8 is connected in the secondary side of 10kV step-down transformer 5, it can be in transformation
Device detects the insulating properties of transformer before being powered, and guarantees the safety of transformer in use, guarantees that transformer is logical
Safety when electric, it is effective to guarantee that transformer says the safety in power grid 1；When the insulation resistance size of transformer do not meet it is logical
When the regulation of electricity, electromagnetic lock 4 is controlled by its controller 6 and is acted, the locking of electromagnetic lock 4 is set to the switch on front side of transformer, makes it
Can not be closed, can effectively ensure that transformer is powered in the case where good insulating, especially suitable for outdoor 10kV input and
The step-down transformer of 220V output, this application scenarios can guarantee that equipment completes the detection of insulation resistance before energization, avoid
Due to transformer insulated property situation that is bad and causing the short circuit of power grid 1, guarantee the safety of equipment, disconnecting switch 3 is as electricity
The locking mechanism of magnetic padlock 4 is that the distance due to disconnecting switch 3 apart from step-down transformer is minimum, can be less because electromagnetic lock 4 is controlled
Route processed it is too long caused by control progress ground defect, guarantee the safety of its electromagnetic lock 4 used, can guarantee equipment
The controller 6 of normal use, the present apparatus uses independent power supply, and can be avoided influences to set because of the route power-off of remote power feeding
The unlock resistance value of electromagnetic lock 4 can be set as needed using the control of MCU in standby usability, the controller 6 of the present apparatus,
When the present apparatus is that cell is powered, the safety in utilization of transformer and its cell route is detected, cell fire is prevented, avoids because of cell
Complicated 1 environment of power grid and the safety used and influence 10kV power grid 1 for influencing step-down transformer.
Specific embodiment 2：
As shown in Figure 1, safety is closed according to the safety closing device described in embodiment 1 for 10kV step-down transformer
Brake system includes：
Control unit, including MCU, display, keyboard and communicator；MCU respectively with display, keyboard and communicator phase
Even；
Power grid unit, including 10kV power grid 1, high voltage isolator 3, breaker 2,10kV step-down transformer 5, air switch
9, load 10,10kV power grid 1 is connected by high voltage isolator 3 and breaker 2 with the primary side of 10kV step-down transformer 5,
The secondary side of 10kV step-down transformer 5 is connected by air switch 9 with load 10；
Resistance detection unit, including relay 7, controller 6, Insulation Resistance Tester 8, Insulation Resistance Tester 8 include
Line end, ground terminal, signal end and shielding end；The line end of Insulation Resistance Tester 8 passes through relay 7 and 10kV step-down transformer 5
Output end is connected, and shielding end connects transformer shell, ground terminal ground connection；Controller 6 respectively with the control terminal of relay 7, insulated electro
It hinders 8 signal end of tester to be connected, controller 6 controls the opening and closing of Insulation Resistance Tester 8 or relay 7 and receives insulation resistance survey
Try the detection signal of instrument 8；
Electromagnetic lock Unit 4, including electromagnetic lock 4, electromagnetic lock 4 are arranged on high voltage isolator 3 with lock house, electromagnetic lock 4,
For the high voltage isolator 3 by the way of machinery opening and closing, which includes moving knife, stationary knife, knife rest, moving knife and fixed
Knife passes through insulation column respectively and is connected on knife rest, and transmission shaft is connected on moving knife, which is used to control the closure of moving knife
Or it opens；It is provided with through-hole or blind hole on transmission shaft, the through-hole or blind when 3 off-state of high voltage isolator, on transmission shaft
Hole is opposite；The collapsing length of the lock house of the electromagnetic lock 4 is 4-6cm；
Load Unit 10, including air switch 9 and load 10,9 input terminal of air switch and the two of 10kV step-down transformer 5
Secondary side is connected, output end is connected with load 10；
Control unit respectively with resistance detection unit and electromagnetic lock Unit 4, control unit judge resistance detection unit detect
To insulating resistance value whether reach setting value, the disconnection shape of the locking of control electromagnetic lock Unit 4 or unlock high voltage isolator 3
State.
Due to above system, electromagnetic lock Unit 4, resistance detection unit interoperation are controlled by MCU, to transformer output end
The detection of insulation resistance is carried out in 10 states that load and light condition, when the detected value of insulation resistance does not meet the regulation of setting
Extremely, the high voltage isolator 3 of transformer primary side is locked as off-state and effectively guarantees the safety being powered, avoid insulating
Property not high transformer when accessing power grid 1, influence the safety of 10kV power grid 1, this system is more depressurized to suitable for 10kV
The step-down transformer of 220V, especially for the step-down transformer of cell power supply, due to the complex circuit of cell power grid 1, in cell
Circuit be easy to cause short circuit, in this case, before accessing power grid 1 carry out Insulation monitoring necessity just highlighted come out,
It can guarantee the normal use of equipment, guarantee the safety that 10kV step-down transformer 5 accesses.
Specific embodiment 3：
According to the safety closing system of the safety closing device as described in example 2 for 10kV step-down transformer, control
Method processed：
Step 1：The high voltage isolator 3 and breaker 2 for detecting the primary side of 10kV step-down transformer 5, which are in, disconnects shape
State, the air switch 9 for detecting the secondary side of 10kV step-down transformer 5 disconnect；
Step 2：High voltage isolator 3 is simultaneously locked as off-state by MCU control electromagnetism valve events；
Step 3：MCU controls relay 7 and is closed, while controlling the starting of Insulation Resistance Tester 8, detects 10kV downconverter
The insulation resistance of 5 light condition of device；The insulation resistance numerical value that Insulation Resistance Tester 8 detects be sent to MCU and by with MCU
Connected display is shown；
Step 4：When the insulation resistance of 5 light condition of 10kV step-down transformer is less than 900 megaohms, MCU by with its phase
Communicator even sends alarm signal；When the insulation resistance of 5 light condition of 10kV step-down transformer is not less than 900 megaohms, MCU
Relay 7 and Insulation Resistance Tester 8 are closed, electric discharge 1-2s then is carried out to the secondary side of 10kV step-down transformer 5；
Step 5：It is closed the air switch 9 of the secondary side of 10kV step-down transformer 5, MCU controls relay 7 and is closed, simultaneously
It controls Insulation Resistance Tester 8 to start, detection 10kV step-down transformer 5 loads the insulation resistance of 10 states；
Step 6：When 10kV step-down transformer 5 load 10 states insulation resistance less than 200 megaohms when, MCU by with its
Connected communicator sends alarm signal；When the insulation resistance that 10kV step-down transformer 5 loads 10 states is not less than 200 megaohms
When, MCU closes relay 7 and Insulation Resistance Tester 8, then to the secondary side electric discharge 1-1.5s of 10kV step-down transformer 5；
Step 7：Insulation Resistance Tester 8 detects 10kV step-down transformer 5 and loads the insulation resistance of 10 states not less than 200
Megaohm, the insulation resistance of light condition is when being not less than 900 megaohms, MCU controls solenoid valve and unlocks to high voltage isolator 3, makes it
It can be closed；
Step 8：The air switch 9 of 5 secondary side of 10kV step-down transformer is disconnected, 10kV step-down transformer is then successively closed
High voltage isolator 3, the breaker 2 of 5 primary sides, are then closed the air switch 9 of 5 secondary side of 10kV step-down transformer, and are
Load 10 provides electricity consumption.
Due to using the above method, measurement 10kV transformer its insulation resistance in the case where zero load is greater than 900 megaohms,
It avoids the insulating properties of 10kV step-down transformer 5 itself inadequate, and endangers the safety of 10kV power grid 1, after completion, detect 10kV
Transformer is greater than 200 megaohms, can guarantee loading with the insulation resistance in the case where load 10, the resistance value of insulation resistance
Insulating properties on the cable at 10 ends improves the safe handling of equipment, in addition, the present apparatus can also be to existing 10kV transformer
It is installed, is conducive to the popularization of the present apparatus.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (5)
1. a kind of safety closing device for 10kV step-down transformer, which is characterized in that including relay, electromagnetic lock, insulation
Resistance meter and controller；Insulation Resistance Tester includes line end, ground terminal, signal end and shielding end, Insulation Resistance Tester
Line end be connected with the output end of 10kV step-down transformer by relay, shielding end connection transformer shell, ground terminal is grounded；Control
The opening and closing of device control Insulation Resistance Tester, relay or solenoid valve processed, and receive the detection signal of Insulation Resistance Tester；Electricity
Magnetic padlock is arranged on the switch of 10kV step-down transformer primary side, and for locking or unlocking to the off-state of the switch；Institute
It states controller to power using 12V storage battery, which is electrically connected by transformer and city；
It further include safety closing system comprising：Control unit, including controller；Power grid unit, including 10kV power grid, high pressure
Disconnecting switch, breaker, 10kV step-down transformer, air switch and load, 10kV power grid pass through high voltage isolator and open circuit
Device is connected with the primary side of 10kV step-down transformer, and the secondary side of 10kV step-down transformer is connected by air switch with load；
Resistance detection unit, including relay, controller, Insulation Resistance Tester；Controller respectively with the control terminal of relay,
Insulation Resistance Tester signal end is connected, and controller controls the opening and closing of Insulation Resistance Tester or relay, and receives insulated electro
Hinder the detection signal of tester；
Electromagnetism lock unit, including electromagnetic lock, electromagnetic lock have lock tongue, electromagnetic lock be arranged on high voltage isolator, the high pressure every
Pass is left by the way of machinery opening and closing, which includes moving knife, stationary knife, knife rest, and moving knife and stationary knife pass through respectively
Insulation column is connected on knife rest, and transmission shaft is connected on moving knife, and the transmission shaft is for controlling closing or opening for moving knife；It is passing
It is provided with through-hole or blind hole on moving axis, when high voltage isolator off-state, the through-hole or blind hole on transmission shaft are opposite；The electromagnetism
The collapsing length of the lock tongue of lock is 4-6cm；
Load unit, including air switch and load, air switch input terminal is connected with the secondary side of 10kV step-down transformer, defeated
Outlet is connected with load；
Control unit is connect with resistance detection unit and electromagnetism lock unit respectively, and control unit judges that resistance detection unit detects
Insulating resistance value whether reach setting value, the off-state of the locking of control electromagnetism lock unit or unlock high voltage isolator；
The control method of safety closing system：
Step 1：The high voltage isolator and breaker for detecting the primary side of 10kV step-down transformer are in an off state, and are detected
The air switch of the secondary side of 10kV step-down transformer disconnects；
Step 2：High voltage isolator is simultaneously locked as off-state by MCU control electromagnetism valve events；
Step 3：MCU controls relay closure, while controlling Insulation Resistance Tester starting, and detection 10kV step-down transformer is unloaded
The insulation resistance of state；The insulation resistance numerical value that Insulation Resistance Tester detects is sent to MCU and is shown by what is be connected with MCU
Show that device is shown；
Step 4：When the insulation resistance of 10kV step-down transformer light condition is less than 900 megaohms, MCU is led to by coupled
It interrogates device and sends alarm signal；When the insulation resistance of 10kV step-down transformer light condition be not less than 900 megaohms when, MCU close after
Then electric appliance and Insulation Resistance Tester carry out electric discharge 1-2s to the secondary side of 10kV step-down transformer；
Step 5：It is closed the air switch of the secondary side of 10kV step-down transformer, MCU controls relay closure, while controlling insulation
Resistance meter starting, detects the insulation resistance of 10kV step-down transformer load condition；
Step 6：When the insulation resistance of 10kV step-down transformer load condition is less than 200 megaohms, MCU is led to by coupled
It interrogates device and sends alarm signal；When the insulation resistance of 10kV step-down transformer load condition be not less than 200 megaohms when, MCU close after
Electric appliance and Insulation Resistance Tester, then to the secondary side electric discharge 1-1.5s of 10kV step-down transformer；
Step 7：Insulation Resistance Tester detects the insulation resistance of 10kV step-down transformer load condition not less than 200 megaohms, sky
When the insulation resistance of load state is not less than 900 megaohms, MCU controls solenoid valve and unlocks to high voltage isolator, can be closed；
Step 8：The air switch of 10kV step-down transformer secondary side is disconnected, 10kV step-down transformer primary side is then successively closed
High voltage isolator, breaker, then be closed 10kV step-down transformer secondary side air switch, and for load use is provided
Electricity.
2. the safety closing device according to claim 1 for 10kV step-down transformer, which is characterized in that the electromagnetism
Lock is fixed on knife rest, which is locked or unlocked the off-state of high voltage isolator by locking transmission shaft.
3. the safety closing device according to claim 1 for 10kV step-down transformer, which is characterized in that the 10kV
The output end of step-down transformer connects having air switch, and the output end of air switch is connected with load.
4. the safety closing device according to claim 1 for 10kV step-down transformer, which is characterized in that the 10kV
Step-down transformer passes sequentially through high voltage isolator, breaker, high voltage isolator and is connected to 10kV power grid.
5. the safety closing device according to claim 1 for 10kV step-down transformer, which is characterized in that the control
Device includes MCU, display, keyboard and communicator；MCU is connected with display, keyboard and communicator respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510908220.9A CN105470941B (en) | 2015-12-10 | 2015-12-10 | A kind of safety closing device for 10kv step-down transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510908220.9A CN105470941B (en) | 2015-12-10 | 2015-12-10 | A kind of safety closing device for 10kv step-down transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105470941A CN105470941A (en) | 2016-04-06 |
| CN105470941B true CN105470941B (en) | 2018-11-27 |
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ID=55608386
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| CN105470919B (en) * | 2015-12-10 | 2018-11-27 | 浙江国正安全技术有限公司 | A kind of safety closing system for 10kV step-down transformer |
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| RU2221325C2 (en) * | 2001-12-11 | 2004-01-10 | Закрытое акционерное общество "ЭЛЕКТРОН" | Induction motor control station |
| CN202772545U (en) * | 2012-08-05 | 2013-03-06 | 江苏省矿业工程集团有限公司 | Safe power supply device for isolation transformer |
| CN203204085U (en) * | 2013-02-27 | 2013-09-18 | 山东电力集团公司物资供应公司 | A comprehensive testing system used for casually inspecting the quality of a distribution transformer |
| CN105470919A (en) * | 2015-12-10 | 2016-04-06 | 成都德善能科技有限公司 | Safety switch-on system for 10kV step-down transformer |
| CN205195244U (en) * | 2015-12-10 | 2016-04-27 | 成都德善能科技有限公司 | A safe combined floodgate system for 10kV reducing transformer |
| CN205195265U (en) * | 2015-12-10 | 2016-04-27 | 成都德善能科技有限公司 | A safe switching -on device for 10kV reducing transformer |
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2015
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2221325C2 (en) * | 2001-12-11 | 2004-01-10 | Закрытое акционерное общество "ЭЛЕКТРОН" | Induction motor control station |
| CN202772545U (en) * | 2012-08-05 | 2013-03-06 | 江苏省矿业工程集团有限公司 | Safe power supply device for isolation transformer |
| CN203204085U (en) * | 2013-02-27 | 2013-09-18 | 山东电力集团公司物资供应公司 | A comprehensive testing system used for casually inspecting the quality of a distribution transformer |
| CN105470919A (en) * | 2015-12-10 | 2016-04-06 | 成都德善能科技有限公司 | Safety switch-on system for 10kV step-down transformer |
| CN205195244U (en) * | 2015-12-10 | 2016-04-27 | 成都德善能科技有限公司 | A safe combined floodgate system for 10kV reducing transformer |
| CN205195265U (en) * | 2015-12-10 | 2016-04-27 | 成都德善能科技有限公司 | A safe switching -on device for 10kV reducing transformer |
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| CN105470941A (en) | 2016-04-06 |
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