CN105470919A - Safety switch-on system for 10kV step-down transformer - Google Patents
Safety switch-on system for 10kV step-down transformer Download PDFInfo
- Publication number
- CN105470919A CN105470919A CN201510908100.9A CN201510908100A CN105470919A CN 105470919 A CN105470919 A CN 105470919A CN 201510908100 A CN201510908100 A CN 201510908100A CN 105470919 A CN105470919 A CN 105470919A
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- CN
- China
- Prior art keywords
- down transformer
- insulation resistance
- mcu
- high voltage
- voltage isolator
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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 invention relates to a safety switch-on system for a 10kV step-down transformer, and belongs to the field of power transmission and supply devices. The system comprises a control unit as well as a resistance detection unit and an electromagnetic lock unit which are connected with the control unit, wherein the control unit determines whether an insulation resistance value detected by the resistance detection unit reaches a set value, and controls the electromagnetic lock unit to lock or unlock an off state of a high-voltage isolation switch. The system is more suitable for the 10kV step-down transformer with a step-down range of 10kV to 220v, especially the 10kV step-down transformer supplying power to communities; as power grid lines of the communities are complicated and circuits in the communities easily cause short circuit, it is necessary for insulation detection before power grid connection; and therefore, the normal use of a device can be ensured and the access safety of the 10kV step-down transformer is guaranteed.
Description
Technical field
The present invention relates to a kind of safety closing system for 10kv step-down transformer, belong to transmission of electricity power supply unit field.
Background technology
10kv step-down transformer is made up of iron core (or magnetic core) and coil, and coil has two or more winding, and wherein connect the winding of power supply primary coil, remaining winding is secondary coil.It can convert alternating voltage, electric current and impedance.The iron core that the simplest 10kv step-down transformer unshakable in one's determination is made by a soft magnetic material and be enclosed within two numbers of turn on iron core coil not etc. and form.Insulation resistance represents the insulation property between each coil of 10kv step-down transformer, between each coil and iron core.The height of insulation resistance and the performance of used insulating material, temperature height are relevant with moist degree.
10kv step-down transformer, when being energized, because person works's error or other factors cause the short circuit of 10kv step-down transformer or the 10kv step-down transformer short circuit of its load patch, easily may cause security incident; Particularly for the 10kv step-down transformer of outdoor application, due to its supply line head, maintenance cycle is long, easily when being energized because the circuit isolation resistance of 10kv step-down transformer or its power supply shortly causes security incident, affect power grid security.
Summary of the invention
The object of the invention is to: for above-mentioned Problems existing, a kind of safety closing system for 10kv step-down transformer is provided, native system is more applicable to the step-down 10kv step-down transformer that 10kv is depressurized to 220v, the especially community step-down 10kv step-down transformer of powering, due to the complex circuit of community electrical network, circuit in community easily causes short circuit, in this case, the necessity of carrying out Insulation monitoring before access electrical network just highlights out, the normal use of equipment can be ensured, ensure the fail safe of 10kv step-down transformer access.
The technical solution used in the present invention is as follows:
The invention discloses a kind of safety closing system for 10kv step-down transformer, comprising:
Control unit, comprises MCU, display, keyboard and communicator; MCU is connected with display, keyboard and communicator respectively;
Electrical network unit, comprise 10kv electrical network, high voltage isolator, circuit breaker, 10kv step-down transformer, air switch, load, 10kv electrical network is connected with the primary side of circuit breaker with 10kv step-down transformer by high voltage isolator, and the secondary side of 10kv step-down transformer is connected with load by air switch;
Resistance detection unit, comprise relay, controller, Insulation Resistance Tester, Insulation Resistance Tester comprise line end, hold, signal end and shielding end, the line end of Insulation Resistance Tester is connected with the output of 10kv step-down transformer by relay, shield hold be connected 10kv step-down transformer housing, hold ground connection; Controller is connected with the control end of relay, Insulation Resistance Tester signal end respectively, and controller controls the keying of Insulation Resistance Tester or relay and receives the detection signal of Insulation Resistance Tester;
Electromagnetic lock unit, comprise electromagnetic lock, electromagnetic lock is with lock house, electromagnetic lock is arranged on high voltage isolator, the mode that this high voltage isolator adopts machinery to open and close, this high voltage isolator comprises moving knife, stationary knife, knife rest, and moving knife and stationary knife are connected on knife rest respectively by insulation column, moving knife is connected with power transmission shaft, and this power transmission shaft is for controlling the closed of moving knife or opening; Power transmission shaft is provided with through hole or blind hole, during high voltage isolator off-state, the through hole on power transmission shaft or blind hole relative; The collapsing length of the lock house of this electromagnetic lock is 4-6cm;
Load unit, comprises air switch and load, and air switch input is connected with the secondary side of 10kv step-down transformer, output is connected with load;
Control unit respectively with resistance detection unit and electromagnetic lock unit, control unit judges whether the insulating resistance value that resistance detection unit detects reaches set point, controls the locking of electromagnetic lock unit or unlocks the off-state of high voltage isolator.
Due to said system, electromagnetic lock unit is controlled by MCU, resistance detection unit interoperation, 10kv step-down transformer output is all carried out to the detection of insulation resistance at 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 10kv step-down transformer primary side is locked as the fail safe that off-state effectively ensures to be energized, during the 10kv step-down transformer access electrical network avoiding insulating properties not high, affect the fail safe of 10kv electrical network, native system is more applicable to the step-down 10kv step-down transformer that 10kv is depressurized to 220v, the especially community step-down 10kv step-down transformer of powering, due to the complex circuit of community electrical network, circuit in community easily causes short circuit, in this case, the necessity of carrying out Insulation monitoring before access electrical network just highlights out, the normal use of equipment can be ensured, ensure the fail safe of 10kv step-down transformer access.
Further, its control method:
Step 1: the high voltage isolator and the circuit breaker that detect the primary side of 10kv step-down transformer are in off-state, the air switch detecting the secondary side of 10kv step-down transformer disconnects;
High voltage isolator is also locked as off-state by the action of step 2:MCU Controlling solenoid valve;
Step 3:MCU control relay closes, and controls Insulation Resistance Tester simultaneously and starts, detect the insulation resistance of 10kv step-down transformer Light Condition; The insulation resistance numerical value that Insulation Resistance Tester detects is sent to MCU and is shown by the display be connected with MCU;
Step 4: when the insulation resistance of 10kv step-down transformer Light Condition is less than 900 megaohm, MCU sends alarm signal by coupled communicator; When the insulation resistance of 10kv step-down transformer Light Condition is not less than 900 megaohm, MCU closed relay and Insulation Resistance Tester, then carry out electric discharge 1-2s to the secondary side of 10kv step-down transformer;
Step 5: the air switch of the secondary side of closed 10kv step-down transformer, MCU control relay closes, and controls Insulation Resistance Tester simultaneously and starts, detect 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 megaohm, MCU sends alarm signal by coupled communicator; When the insulation resistance of 10kv step-down transformer load condition is not less than 200 megaohm, MCU closed relay and Insulation Resistance Tester, then to the secondary side electric discharge 1-1.5s of 10kv step-down transformer;
Step 7: when the insulation resistance of Insulation Resistance Tester detection 10kv step-down transformer load condition is not less than 200 megaohms, the insulation resistance of Light Condition is not less than 900 megaohm, MCU Controlling solenoid valve unlocks high voltage isolator, can close;
Step 8: the isolating switch disconnecting 10kv step-down transformer secondary side, then closes high voltage isolator, the circuit breaker of 10kv step-down transformer primary side successively, then the air switch not load electricity consumption of closed 10kv step-down transformer secondary side.
Owing to have employed said method, measure 10kv step-down transformer its insulation resistance when zero load and be greater than 900 megaohms, avoid the insulating properties of 10kv step-down transformer itself inadequate, and endanger the fail safe of 10kv electrical network, after completing, detect the insulation resistance in the loaded situation of 10kv step-down transformer band, the resistance of its insulation resistance is greater than 200 megaohms, the insulating properties on the cable of load end can be ensured, the safe handling of raising equipment, in addition, this device can also be installed existing 10kv step-down transformer, is conducive to the popularization of this device.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows:
1, this apparatus structure is simple, easy to use, there is stronger generalization, be not only applicable to coming into operation of the 10kv step-down transformer of new production, simultaneously, be applicable to improvement and the installation of existing 10kv step-down transformer, strengthen versatility and the fail safe of 10kv step-down transformer, the potential safety hazard of less 10kv electrical network.
2, this device is applicable to the 10kv step-down transformer of community or open air, effectively can reduce the safety because of 10kv step-down transformer insulating properties less harmful electrical network own and 10kv step-down transformer, also can avoid the fail safe that affect equipment low with the insulating properties of its cable be connected of 10kv step-down transformer, effective guarantee 10kv step-down transformer uses normally simultaneously.
3, this device all carries out Insulation monitoring between each energising, avoids the situation of the cable after keeping in repair or the rear short circuit of 10kv step-down transformer energising, avoids the safe handling of equipment.
Accompanying drawing explanation
Fig. 1 is the safety closing system construction drawing for 10kv step-down transformer in the present invention;
Mark in figure: 1-10kv electrical network, 2-circuit breaker, 3-high voltage isolator, 4-electromagnetic lock, 5-10kv step-down transformer 5,6-controller, 7-relay, 8-Insulation Resistance Tester, 9-air switch, 10-load.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
specific embodiment 1:
As shown in Figure 1, a kind of safety closing system for 10kv step-down transformer of the present invention, comprising:
Control unit, comprises MCU, display, keyboard and communicator; MCU is connected with display, keyboard and communicator respectively;
Electrical network unit, comprise 10kv electrical network 1, high voltage isolator 3, circuit breaker 2,10kv step-down transformer 5, air switch 9, load 10,10kv electrical network 1 is connected with the primary side of circuit breaker 2 with 10kv step-down transformer 5 by high voltage isolator 3, and the secondary side of 10kv step-down transformer 5 is connected with load 10 by air switch 9;
Resistance detection unit, comprise relay 7, controller 6, Insulation Resistance Tester 8, Insulation Resistance Tester 8 comprise line end, hold, signal end and shielding end, the line end of Insulation Resistance Tester 8 is connected with the output of 10kv step-down transformer 5 by relay 7, shield hold be connected 10kv step-down transformer housing, hold ground connection; Controller 6 is connected with the control end of relay 7, Insulation Resistance Tester 8 signal end respectively, and controller 6 controls the keying of Insulation Resistance Tester 8 or relay 7 and receives the detection signal of Insulation Resistance Tester 8;
Electromagnetic lock 4 unit, comprise electromagnetic lock 4, electromagnetic lock 4 is with lock house, electromagnetic lock 4 is arranged on high voltage isolator 3, the mode that this high voltage isolator 3 adopts machinery to open and close, this high voltage isolator 3 comprises moving knife, stationary knife, knife rest, and moving knife and stationary knife are connected on knife rest respectively by insulation column, moving knife is connected with power transmission shaft, and this power transmission shaft is for controlling the closed of moving knife or opening; Power transmission shaft is provided with through hole or blind hole, during high voltage isolator 3 off-state, the through hole on power transmission shaft or blind hole relative; The collapsing length of the lock house of this electromagnetic lock 4 is 4-6cm;
Load 10 unit, comprises air switch 9 and load 10, and air switch 9 input is connected with the secondary side of 10kv step-down transformer 5, output is connected with load 10;
Control unit respectively with resistance detection unit and electromagnetic lock 4 unit, control unit judges whether the insulating resistance value that resistance detection unit detects reaches set point, controls the locking of electromagnetic lock 4 unit or unlocks the off-state of high voltage isolator 3.
Due to said system, electromagnetic lock 4 unit is controlled by MCU, resistance detection unit interoperation, 10kv step-down transformer output is all carried out to the detection of insulation resistance at load 10 state and Light Condition, when the detected value of insulation resistance does not meet the regulation of setting extremely, the high voltage isolator 3 of 10kv step-down transformer primary side is locked as the fail safe that off-state effectively ensures to be energized, during the 10kv step-down transformer access electrical network avoiding insulating properties not high, affect the fail safe of 10kv electrical network 1, native system is more applicable to the step-down 10kv step-down transformer that 10kv is depressurized to 220v, the especially community step-down 10kv step-down transformer of powering, due to the complex circuit of community electrical network 1, circuit in community easily causes short circuit, in this case, the necessity of carrying out Insulation monitoring before access electrical network 1 just highlights out, the normal use of equipment can be ensured, ensure the fail safe that 10kv step-down transformer 5 accesses.
specific embodiment 2:
The safety closing system of the safety closing system for 10kv step-down transformer according to embodiment 1, its control method:
Step 1: the high voltage isolator 3 and the circuit breaker 2 that detect the primary side of 10kv step-down transformer 5 are in off-state, and the air switch 9 detecting the secondary side of 10kv step-down transformer 5 disconnects;
High voltage isolator 3 is also locked as off-state by the action of step 2:MCU Controlling solenoid valve;
Step 3:MCU control relay 7 closes, and controls Insulation Resistance Tester 8 simultaneously and starts, detect the insulation resistance of 10kv step-down transformer 5 Light Condition; The insulation resistance numerical value that Insulation Resistance Tester 8 detects is sent to MCU and is shown by the display be connected with MCU;
Step 4: when the insulation resistance of 10kv step-down transformer 5 Light Condition is less than 900 megaohm, MCU sends alarm signal by coupled communicator; When the insulation resistance of 10kv step-down transformer 5 Light Condition is not less than 900 megaohm, MCU closed relay 7 and Insulation Resistance Tester 8, then carry out electric discharge 1-2s to the secondary side of 10kv step-down transformer 5;
Step 5: air switch 9, the MCU control relay 7 of the secondary side of closed 10kv step-down transformer 5 closes, and controls Insulation Resistance Tester 8 simultaneously and starts, and detects the insulation resistance of 10kv step-down transformer 5 load 10 state;
Step 6: when the insulation resistance of 10kv step-down transformer 5 load 10 state is less than 200 megaohm, MCU sends alarm signal by coupled communicator; When the insulation resistance of 10kv step-down transformer 5 load 10 state is not less than 200 megaohm, MCU closed 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: when the insulation resistance that Insulation Resistance Tester 8 detects 10kv step-down transformer 5 load 10 state is not less than 200 megaohms, the insulation resistance of Light Condition is not less than 900 megaohm, MCU Controlling solenoid valve unlocks high voltage isolator 3, can close;
Step 8: the isolating switch 3 disconnecting 10kv step-down transformer 5 secondary side, then closes high voltage isolator 3, the circuit breaker 2 of 10kv step-down transformer 5 primary side successively, then air switch 9 not load 10 electricity consumption of closed 10kv step-down transformer 5 secondary side.
Owing to have employed said method, measure 10kv step-down transformer its insulation resistance when zero load and be greater than 900 megaohms, avoid the insulating properties of 10kv step-down transformer 5 itself inadequate, and endanger the fail safe of 10kv electrical network 1, after completing, detect 10kv step-down transformer with load 10 when insulation resistance, the resistance of its insulation resistance is greater than 200 megaohms, the insulating properties on the cable of load 10 end can be ensured, the safe handling of raising equipment, in addition, this device can also be installed existing 10kv step-down transformer, be conducive to the popularization of this device.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1., for a safety closing system for 10kv step-down transformer, it is characterized in that, comprising:
Control unit, comprises MCU, display, keyboard and communicator; MCU is connected with display, keyboard and communicator respectively;
Electrical network unit, comprise 10kv electrical network, high voltage isolator, circuit breaker, 10kv step-down transformer, air switch, load, 10kv electrical network is connected with the primary side of circuit breaker with 10kv step-down transformer by high voltage isolator, and the secondary side of 10kv step-down transformer is connected with load by air switch;
Resistance detection unit, comprise relay, controller, Insulation Resistance Tester, Insulation Resistance Tester comprise line end, hold, signal end and shielding end, the line end of Insulation Resistance Tester is connected with the output of 10kv step-down transformer by relay, shield hold be connected 10kv step-down transformer housing, hold ground connection; Controller is connected with the control end of relay, Insulation Resistance Tester signal end respectively, and controller controls the keying of Insulation Resistance Tester or relay and receives the detection signal of Insulation Resistance Tester;
Electromagnetic lock unit, comprise electromagnetic lock, electromagnetic lock is with lock house, electromagnetic lock is arranged on high voltage isolator, the mode that this high voltage isolator adopts machinery to open and close, this high voltage isolator comprises moving knife, stationary knife, knife rest, and moving knife and stationary knife are connected on knife rest respectively by insulation column, moving knife is connected with power transmission shaft, and this power transmission shaft is for controlling the closed of moving knife or opening; Power transmission shaft is provided with through hole or blind hole, during high voltage isolator off-state, the through hole on power transmission shaft or blind hole relative; The collapsing length of the lock house of this electromagnetic lock is 4-6cm;
Load unit, comprises air switch and load, and air switch input is connected with the secondary side of 10kv step-down transformer, output is connected with load;
Control unit respectively with resistance detection unit and electromagnetic lock unit, control unit judges whether the insulating resistance value that resistance detection unit detects reaches set point, controls the locking of electromagnetic lock unit or unlocks the off-state of high voltage isolator.
2. the safety closing system for 10kv step-down transformer according to claim 2, is characterized in that, its control method:
Step 1: the high voltage isolator and the circuit breaker that detect the primary side of 10kv step-down transformer are in off-state, the air switch detecting the secondary side of 10kv step-down transformer disconnects;
High voltage isolator is also locked as off-state by the action of step 2:MCU Controlling solenoid valve;
Step 3:MCU control relay closes, and controls Insulation Resistance Tester simultaneously and starts, detect the insulation resistance of 10kv step-down transformer Light Condition; The insulation resistance numerical value that Insulation Resistance Tester detects is sent to MCU and is shown by the display be connected with MCU;
Step 4: when the insulation resistance of 10kv step-down transformer Light Condition is less than 900 megaohm, MCU sends alarm signal by coupled communicator; When the insulation resistance of 10kv step-down transformer Light Condition is not less than 900 megaohm, MCU closed relay and Insulation Resistance Tester, then carry out electric discharge 1-2s to the secondary side of 10kv step-down transformer;
Step 5: the air switch of the secondary side of closed 10kv step-down transformer, MCU control relay closes, and controls Insulation Resistance Tester simultaneously and starts, detect 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 megaohm, MCU sends alarm signal by coupled communicator; When the insulation resistance of 10kv step-down transformer load condition is not less than 200 megaohm, MCU closed relay and Insulation Resistance Tester, then to the secondary side electric discharge 1-1.5s of 10kv step-down transformer;
Step 7: when the insulation resistance of Insulation Resistance Tester detection 10kv step-down transformer load condition is not less than 200 megaohms, the insulation resistance of Light Condition is not less than 900 megaohm, MCU Controlling solenoid valve unlocks high voltage isolator, can close;
Step 8: the isolating switch disconnecting 10kv step-down transformer secondary side, then closes high voltage isolator, the circuit breaker of 10kv step-down transformer primary side successively, then the air switch not load electricity consumption of closed 10kv step-down transformer secondary side.
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| 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 |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510908100.9A CN105470919B (en) | 2015-12-10 | 2015-12-10 | A kind of safety closing system for 10kV step-down transformer |
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| CN105470919A true CN105470919A (en) | 2016-04-06 |
| CN105470919B CN105470919B (en) | 2018-11-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| 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 |
| 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 |
| 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 |
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| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| 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 | Publication date |
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| CN105470919B (en) | 2018-11-27 |
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Effective date of registration: 20181018 Address after: 312030, fourth floor, building 1, north gate of Qixian international logistics center, Keqiao, Shaoxing, Zhejiang. Applicant after: Safe Technology Ltd of Zhejiang Address before: 610000 No. 1, 5, No. 31, 1 south two section, Wuhou District first ring road, Chengdu, Sichuan. Applicant before: CHENGDU DESHANNENG TECHNOLOGY CO., LTD. |
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