CN105470919B - A kind of safety closing system for 10kV step-down transformer - Google Patents
A kind of safety closing system for 10kV step-down transformer Download PDFInfo
- Publication number
- CN105470919B CN105470919B CN201510908100.9A CN201510908100A CN105470919B CN 105470919 B CN105470919 B CN 105470919B CN 201510908100 A CN201510908100 A CN 201510908100A CN 105470919 B CN105470919 B CN 105470919B
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- down transformer
- insulation resistance
- mcu
- high voltage
- load
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
- H01H31/02—Details
- H01H31/026—Movable parts and contacts mounted thereon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/20—Interlocking, locking, or latching mechanisms
-
- 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
Abstract
The present invention relates to a kind of safety closing systems for 10kv step-down transformer, belong to transmission of electricity power supply unit field.The resistance detection unit and electromagnetism lock unit being connected including control unit and respectively with control unit, control unit judges whether the insulating resistance value that resistance detection unit detects reaches the off-state of setting value, the locking of control electromagnetism lock unit or unlock high voltage isolator.This system is more suitable for the decompression 10kv step-down transformer that 10kv is depressurized to 220v, especially for the decompression 10kv step-down transformer of cell power supply, due to the complex circuit of cell power grid, circuit in cell be easy to cause short circuit, in this case, the necessity that Insulation monitoring is carried out before accessing power grid, which has just highlighted, to be come out, and can be guaranteed the normal use of equipment, be guaranteed the safety of 10kv step-down transformer access.
Description
Technical field
The present invention relates to a kind of safety closing systems for 10kV step-down transformer, belong to transmission of electricity power supply unit field.
Background technique
10kV step-down transformer is by iron core（Or magnetic core）It being formed with coil, there are two coils or more than two windings,
In connect the winding of power supply primary coil, remaining winding is secondary coil.It can convert alternating voltage, electric current and impedance.
Iron core that simplest iron core 10kV step-down transformer is made by a soft magnetic materials and two the number of turns covered on iron core differ
Coil constitute.Insulation resistance indicates the insulation performance between each coil of 10kV step-down transformer, between each coil and iron core.Absolutely
The height of edge resistance is related with the performance of used insulating materials, temperature height and moist degree.
10kV step-down transformer is when being powered, probably due to person works' fault or other factors cause 10kV decompression to become
The 10kV step-down transformer short circuit of the short circuit of depressor or its load patch, is easy to cause safety accident；Especially for room
The outer 10kV step-down transformer used, due to its power supply line head, maintenance cycle is long, is easy to become when being powered since 10kV is depressured
Depressor or its power supply circuit isolation resistance it is short cause safety accident, influence 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
Combined floodgate system, this system are more suitable for the decompression 10kV step-down transformer that 10kV is depressurized to 220V, supply especially for cell
The decompression 10kV step-down transformer of electricity, due to the complex circuit of cell power grid, the circuit in cell be easy to cause short circuit, this feelings
Under condition, the necessity that Insulation monitoring is carried out before accessing power grid, which has just highlighted, to be come out, and can be guaranteed the normal use of equipment, be guaranteed
The safety of 10kV step-down transformer access.
The technical solution adopted by the present invention is as follows：
The invention discloses a kind of safety closing systems for 10kV step-down transformer, including：
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 10kV step-down transformer shell, ground terminal ground connection；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 Insulation Resistance Tester
Detection signal；
Electromagnetism lock unit, including electromagnetic lock, electromagnetic lock have lock tongue, and electromagnetic lock is arranged on high voltage isolator, 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 tongue 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；
Control unit is connect with resistance detection unit and electromagnetism lock unit respectively, and control unit judges that resistance detection unit is examined
Whether the insulating resistance value measured reaches the disconnection shape of setting value, the locking of control electromagnetism lock unit or unlock high voltage isolator
State.
Due to above system, electromagnetism lock unit, resistance detection unit interoperation are controlled by MCU, to 10kV downconverter
Device output end carries out the detection of insulation resistance in load condition and light condition, when the detected value of insulation resistance does not meet setting
Specified value, by the high voltage isolator of 10kV step-down transformer primary side be locked as off-state effectively guarantee be powered peace
Quan Xing influences the safety of 10kV power grid, this system is more when the 10kV step-down transformer for avoiding insulating properties not high accesses power grid
The 10kV that is suitable for be depressurized to the decompression 10kV step-down transformer of 220v, especially for the decompression 10kV downconverter of cell power supply
Device, due to the complex circuit of cell power grid, the circuit in cell be easy to cause short circuit, in this case, advances in access power grid
The necessity of row Insulation monitoring, which has just highlighted, to be come out, and can guarantee the normal use of equipment, guarantees the access of 10kV step-down transformer
Safety.
Further, control method：
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, measures 10kV step-down transformer its insulation resistance in the case where zero load and be greater than 900
Megaohm, avoid the insulating properties of 10kV step-down transformer itself inadequate, and the safety of 10kV power grid is endangered, after completion, detection
10kV step-down transformer is greater than 200 megaohms, can guarantee with the insulation resistance in the case where load, the resistance value of insulation resistance
Insulating properties on the cable of load end improves the safe handling of equipment, in addition, the present apparatus can also drop existing 10kV
Pressure transformer is installed, and the popularization of the present apparatus is conducive to.
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 10kV decompression of new production
Transformer comes into operation, meanwhile, suitable for the improvement and installation of existing 10kV step-down transformer, enhance 10kV step-down transformer
Versatility and safety, the security risk of less 10kV power grid.
2, the present apparatus is suitable for the 10kV step-down transformer of cell or open air, can effectively reduce and become because 10kV is depressured
The safety of depressor itself insulating properties less harmful power grid and 10kV step-down transformer, at the same be also avoided that with 10kV step-down transformer its
The low safety for influencing equipment of the insulating properties of connected cable, it is effective to guarantee that 10kV step-down transformer normally uses.
3, the present apparatus carries out Insulation monitoring between each be powered, the cable or 10kV downconverter after avoiding maintenance
Device situation short-circuit after being powered, 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 system for 10kV step-down transformer of the invention, including：
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 pass through relay 7 and 10kV step-down transformer 5
Output end is connected, and shielding end connects 10kV step-down transformer shell, ground terminal ground connection；The control with relay 7 respectively of controller 6
End, 8 signal end of Insulation Resistance Tester are connected, and controller 6 controls the opening and closing of Insulation Resistance Tester 8 or relay 7, and receives
The detection signal of Insulation Resistance Tester 8；
Electromagnetic lock Unit 4, including electromagnetic lock 4, electromagnetic lock 4 have lock tongue, and electromagnetic lock 4 is arranged on high voltage isolator 3,
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 tongue 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 is connect with resistance detection unit and electromagnetic lock Unit 4 respectively, and control unit judges resistance detection unit
Whether the insulating resistance value detected reaches setting value, and control electromagnetic lock Unit 4 locks or unlock the disconnected of high voltage isolator 3
Open state.
Due to above system, electromagnetic lock Unit 4, resistance detection unit interoperation are controlled by MCU, to 10kV downconverter
Device output end carries out the detection of insulation resistance in 10 states that load and light condition, sets when the detected value of insulation resistance is not met
The high voltage isolator 3 of 10kV step-down transformer primary side is locked as off-state and effectively guarantees to be powered by fixed specified value
Safety, avoid insulating properties it is not high 10kV step-down transformer access power grid when, influence the safety of 10kV power grid 1, this is
System is more depressurized to the decompression 10kV step-down transformer of 220v suitable for 10kV, drops especially for the decompression 10kV of cell power supply
Pressure transformer, due to the complex circuit of cell power grid 1, the circuit in cell be easy to cause short circuit, in this case, in access electricity
The necessity that Insulation monitoring is carried out before net 1, which has just highlighted, to be come out, and can be guaranteed the normal use of equipment, be guaranteed 10kV downconverter
The safety that device 5 accesses.
Specific embodiment 2：
According to the safety closing system of the safety closing system described in embodiment 1 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, measures 10kV step-down transformer its insulation resistance in the case where zero load and be greater than 900
Megaohm, avoid the insulating properties of 10kV step-down transformer 5 itself inadequate, and the safety of 10kV power grid 1 is endangered, after completion, inspection
10kV step-down transformer is surveyed with the insulation resistance in the case where load 10, the resistance value of insulation resistance is greater than 200 megaohms, can
Guarantee the insulating properties on the cable for loading 10 ends, the safe handling of equipment is improved, in addition, the present apparatus can also be to existing
10kV step-down transformer is installed, and the popularization of the present apparatus is conducive to.
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 (1)
1. a kind of safety closing system for 10kV step-down transformer, which is characterized in that including：
Control unit, including MCU, display, keyboard and communicator；MCU is connected with display, keyboard and communicator respectively；
Power grid unit, including 10kV power grid, high voltage isolator, breaker, 10kV step-down transformer, air switch, load,
10kV power grid is connected by high voltage isolator and breaker with the primary side of 10kV step-down transformer, 10kV step-down transformer
Secondary side is connected by air switch with load；
Resistance detection unit, including relay, controller, Insulation Resistance Tester, Insulation Resistance Tester include line end,
End, 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 10kV step-down transformer shell, ground terminal ground connection；Controller respectively with the control terminal of relay, insulation resistance
Tester signal end is connected, and the opening and closing of controller control Insulation Resistance Tester or relay simultaneously receives Insulation Resistance Tester
Detect signal；
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 are connected with the secondary side of 10kV step-down transformer, are 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；
It further include control method：
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510908100.9A CN105470919B (en) | 2015-12-10 | 2015-12-10 | A kind of safety closing system for 10kV step-down transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510908100.9A CN105470919B (en) | 2015-12-10 | 2015-12-10 | A kind of safety closing system for 10kV step-down transformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105470919A CN105470919A (en) | 2016-04-06 |
| CN105470919B true CN105470919B (en) | 2018-11-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510908100.9A Active CN105470919B (en) | 2015-12-10 | 2015-12-10 | A kind of safety closing system for 10kV step-down transformer |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105470941B (en) * | 2015-12-10 | 2018-11-27 | 浙江国正安全技术有限公司 | A kind of safety closing device for 10kv step-down transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4562390A (en) * | 1983-10-05 | 1985-12-31 | Hitachi, Ltd. | Insulation resistance measurement in static leonard apparatus |
| 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 |
| CN105470941A (en) * | 2015-12-10 | 2016-04-06 | 成都德善能科技有限公司 | Safety switch-on apparatus 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 |
-
2015
- 2015-12-10 CN CN201510908100.9A patent/CN105470919B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4562390A (en) * | 1983-10-05 | 1985-12-31 | Hitachi, Ltd. | Insulation resistance measurement in static leonard apparatus |
| 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 |
| CN105470941A (en) * | 2015-12-10 | 2016-04-06 | 成都德善能科技有限公司 | Safety switch-on apparatus 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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| Publication number | Publication date |
|---|---|
| CN105470919A (en) | 2016-04-06 |
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