High-speed permanent magnet mechanism development high-voltage low-voltage switch breaker contactor frame monostable bistable solenoid valve permanent magnet retention mechanism OEM/ODM 7500N
Permanent magnet switch development monostable bistable permanent magnet mechanism bistable solenoid valve mechanism retention force 1000N/1500N/4000N/6000N/7500N overview
Development of contactor for permanent magnet mechanism high voltage and low voltage switch breaker
ZW32 ZN VS1 VSM permanent magnet frame monostable bistable permanent magnet retention mechanism 7500N
The YCG permanent magnet mechanism developed by our company is used to replace the original bullet-operating mechanism. It has developed mature and reliable permanent magnet operating mechanism for dozens of domestic switch manufacturers. It is equipped with ZW type, ZN type and VMS type. Vacuum circuit breaker, widely used in electric power, coal, steel, petroleum, railway and other systems.
advantage
· Maintenance free during the entire life cycle
· Long electrical and mechanical life
· Fast coincidence ability
· Suitable for installation in various cabinet types (such as fixed cabinets, hand cabinets)
· Wide range of operating power supplies
· Easy to be compatible with SCADA
· Low power consumption
· Small size and light weight
Our company's permanent magnet operating mechanism eliminates complex mechanical locks and tripping systems due to the small number of moving parts. It has an irreplaceable advantage: less failure, reliability, long life (up to 100,000 times), no need Lubrication, it is very suitable for some occasions requiring high reliability and frequent operation, such as power supply, coal mine, steel making, railway, etc.
Using our permanent magnet operating mechanism and our company's YCK380 series permanent magnet switch controller, we can realize the circuit breaker's opening and closing operation, over-current breaking protection, voltage loss protection, wireless remote control operation, reclosing operation, and The distribution network automation function makes the switch an intelligent circuit breaker.
Note a few points:
1. It is not recommended to use a simple contactor as the control unit of the permanent magnet mechanism because:
(1) The use of contactors results in high energy consumption and requires a larger discharge capacitor;
(2) It is easy to burn the coil of the permanent magnet mechanism;
(3) When the contact of the contactor breaks the circuit, strong electromagnetic field interference will occur, resulting in malfunction of the protection and control device;
(4) When the contacts of the contactor pass a large current, the life is short, so that one of the main advantages of the permanent magnet mechanism does not exist. And our company's YCK380 permanent magnet switch controller can reach more than 100,000 times without damage.
2. Regarding the manual opening and closing of the permanent magnet mechanism: the permanent magnet mechanism must be equipped with an emergency manual opening. Its function is to use the emergency manual opening to open the circuit breaker when the control unit loses power or is damaged. . Emergency manual opening must be purely mechanical and cannot be operated using electrical and electronic components. Emergency manual opening is used to disconnect the rated current, which is generally not used in the event of a short circuit.
At present, some manufacturers have equipped the permanent magnet mechanism with a manual closing function. In fact, the manual closing function of the permanent magnet mechanism is not practical. First, the operator has a safety risk. Second, the manual closing speed of the permanent magnet mechanism is slow, and the probability of not being able to match is large. The third is the power supply in the dual line. Under the circumstances, closed-loop and reverse power transmission may occur, threatening the personal safety of power maintenance personnel and even leading to major casualties. Therefore, some users explicitly require that the permanent magnet mechanism be prohibited from being equipped with a manual closing function, such as a coal mine system.
3. Our company has also developed an emergency switching controller for emergency control of permanent magnet circuit breakers: when the permanent magnet switch is installed on the pole and there is no power (including backup power), it can be temporarily controlled by the controller. The switch is combined; when the control part of the permanent magnet switch is faulty, the controller can also be used to control the switch. The device has a compact structure and is convenient to carry, and is very suitable for inspection when the permanent magnet switch on the line is inspected and when the permanent magnet switch is inspected in the workshop.
Chapter II Basic Working Principle of Permanent Magnet Mechanism
First, classification
According to different standards, the permanent magnet mechanism is divided into different types, mainly monostable and bistable, single coil and double coil, round and square, and there is no obvious difference between them. Have their own advantages. The following briefly introduces the difference between monostable and bistable permanent magnet mechanisms.
The so-called bistable permanent magnet mechanism refers to the use of permanent magnets at the closing end and the opening end. The action of splitting and closing is accomplished by energizing the moving iron core through two exciting coils respectively; the so-called monostable permanent The magnetic mechanism refers to the permanent magnet holding at the closing end and the spring holding at the opening end. The closing action is completed by energizing the moving iron core by closing the exciting coil, and simultaneously opening the switch during the closing process. Keeping the spring energy storage, the opening action is accomplished by releasing the opening and holding spring.
Monostable and bistable permanent magnet mechanisms have no distinction between superior and inferior, and have their own advantages .
Bistable
Advantages: Under the same conditions, the value of the closing current peak of the bistable permanent magnet mechanism is small. For the control part, the smaller the current, the simpler and more reliable the control, and the smaller the probability of damage to the controller. In addition, the closing and closing current is small, and the discharge capacity is not too large. Generally, a 100V/100,000 microfarad electrolytic capacitor can be used to realize the reclosing operation of the circuit breaker.
Disadvantages: Based on the bistable design principle, the bistable permanent magnet mechanism has a just-segment speed lower than the full-opening average speed, but through our company's special design, it can accelerate the opening and reduce the opening and closing vibration.
Monostable
Advantages: Since the opening action of the monostable permanent magnet mechanism is completed by the opening spring, the splitting speed and the average opening speed of the opening are better than the bistable permanent magnet mechanism, and the opening and closing of the circuit breaker The force characteristic curve can be better matched.
Disadvantages: Since the monostable permanent magnet mechanism keeps the spring energy storage at the same time when closing, the peak value of the closing current is much larger than that of the bistable permanent magnet mechanism under the same conditions, and the spring vibration is larger when the brake is opened.
Second, the basic principles
The basic working principle of a permanent magnet mechanism can be summarized in three words: permanent magnet retention, electromagnetic drive, and electronic control.
Permanent magnet retention: the closing state is maintained by a permanent magnet, overcoming the reaction force of the contact spring;
Electromagnetic drive: the energized excitation coil generates electromagnetic energy to drive the core motion to complete the opening and closing action;
Electronic control: The control system of the permanent magnet mechanism uses electronic devices, including power electronic switches (ie, IGBT, MOSFET, thyristor), integrated circuit boards, CPU chips, and the like.
1 and 2 are schematic diagrams of a permanent magnet drive mechanism of a bistable coil structure
Taking the bistable and double-coil permanent magnet operating mechanism as an example to introduce the operating principle of the permanent magnet mechanism:
The magnetic energy generated by the energized split and closing coils drives the upper and lower movements of the iron core to complete the opening and closing operations, and the moving iron core is kept open at the movable magnetic core and the static iron core through the magnetic field energy generated by the low reluctance passage. Or close the two positions, no additional energy is required. 1 and 2 are schematic views of a permanent magnet drive mechanism of a bistable coil structure. It consists of a static iron core, a moving iron core, a permanent magnet, a ram, a closing coil, a trip coil and an auxiliary connecting rod. The moving iron core and the static iron core generate strong magnetic energy through the low reluctance channel, and keep the moving iron core at the lower end or the upper end position; the magnetic force generated by the closing coil and the opening coil of the current can move the moving iron core upward or downward, Complete the closing and opening operations.
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Figure 3: Bistable permanent magnet mechanism Figure 4: Monostable permanent magnet mechanism
1- static iron core 2-moving iron core 3-closing coil 1-static iron core 2-moving iron core 3-operation coil
4-Brake coil 5, 6- permanent magnet 7-drive rod 4- permanent magnet 5-drive rod
Chapter III Types of Permanent Magnet Mechanisms and Typical Examples
First, the type of permanent magnet operating mechanism designed and developed by our company
| Serial number |
category |
Existing design |
| 1 |
Circuit breaker voltage level |
6kV, 10kV, 35kV |
| 2 |
Circuit breaker rated short circuit current |
12.5kA, 20kA, 25kA, 31.5kA, 40kA, 50kA |
| 3 |
Adapted circuit breaker model |
Outdoor ZW type, indoor ZN type, Vm type, etc. |
| 4 |
Body shape |
Circular structure square structure |
| 5 |
Institutional closing force |
Up to 7kN |
| 6 |
structure |
Bistable double coil, monostable single coil |
| 7 |
Operation type |
Three-phase one-in-one operation
Three-phase three-independent operation: mostly used for phase selection switch
Single-phase single-unit operation: mostly used for railway switches
|
Second, a typical example
The following are examples of the design of several typical permanent magnet operating mechanisms in our company.
(1) ZW32-12/630-20 type
Chapter IV Basic Parameters of Permanent Magnet Mechanism
The characteristic parameters of the permanent magnet mechanism are related to the adapted circuit breaker, in particular the parameters of the vacuum interrupter. Different series of vacuum interrupters have different requirements for opening and closing speed, mechanical life, contact pressure, opening distance, overtravel, bounce, and different periods. Correspondingly, it is necessary to optimize the permanent magnet mechanism. Designed to meet the requirements of the arc chamber. Therefore, for the user, the selection of the permanent magnet mechanism is not the greater the retention force, the faster the better, the faster the speed, the lower the life of the vacuum interrupter on the one hand, and the increased operating current on the other hand. At the cost, the reliability of the control part is degraded.
The following table is the relevant parameters of ZW32-12/630-20 permanent magnet mechanism designed by our company.
ZW32 permanent magnet mechanism outline drawing
Related parameters
| Serial number |
parameter name |
unit |
Numerical value |
| 1 |
Closing retention |
N |
5000 |
| 2 |
Mechanism closing coil operating current (peak) |
A |
Opening: 35
Closing: 25
|
| 3 |
Opening and closing time |
Ms |
Opening: ≤45
Closing: ≤65
|
| 4 |
Mechanical life |
|
100,000 times (type test measured value) |
| 5 |
Mechanism operating voltage |
V |
DC100V~DC120V |
| 6 |
bounce |
Ms |
≤2 |
| 7 |
The same period |
Ms |
≤2 |
| 8 |
Opening and closing speed |
m/s |
Opening: 0.7-1.2
Closing: 0.4-0.8
|
| 9 |
Energy storage time |
S |
≤8 (per cycle) |
| 10 |
voltage |
V |
AC and DC 110V, 220V |
| 11 |
Contact stroke |
Mm |
8-10 |
| 12 |
Contact overtravel |
Mm |
3.5-4.5 |
(2) VMS (VS1) (□-12/1250-31.5) type - round mechanism
1. Overview:
VMS ( VS1 (ZN63A)) round indoor AC high voltage permanent magnet mechanism vacuum circuit breaker is suitable for 12kV air insulated indoor switchgear. It is used as protection and control unit for power grid equipment, industrial and mining enterprise power equipment, for opening and closing various Different types of electric load are suitable for power grid construction and renovation projects such as urban power grids, rural power grids, mines and railways, especially for frequent operation and short circuit opening in the working current range. (ZN63A) The occasion. The product absorbs advanced technology and technology at home and abroad, and has the characteristics of intelligence, high reliability, long life and maintenance-free. It is environmentally friendly when it is used without pollution to the surrounding environment.
The VMS ( VS1 ) round indoor high voltage vacuum circuit breaker can be operated frequently with multiple breaking and fast reclosing capabilities.
The circuit breaker can be used as a fixed installation unit or a special propulsion mechanism to form a handcart unit.
The permanent magnet operating mechanism and the vacuum interrupter of the VMS ( VS1 ) circular vacuum circuit breaker are arranged in front and rear. The main conductive circuit is a floor-standing structure. The upper and lower outlet seats and the vacuum interrupter are installed in a tubular insulating cylinder. Inside. The insulating cylinder is made of epoxy resin by APG process. This structure makes the surface of the vacuum interrupter not accumulate dust and avoids damage from external factors, ensuring that the product is still good under damp heat and severe pollution. Insulation properties.
This product complies with GB1984 "High Voltage AC Circuit Breaker", JB3855-85 "10kV Indoor Interlock High Voltage Vacuum Circuit Breaker", DL403-91 "10-35kV Indoor High Voltage Vacuum Circuit Breaker Ordering Technical Conditions" and related IEC standards, and Has a reliable interlock function.
2. Technical parameters :
2.1. Technical parameters are shown in Table 1
Table 1 Technical parameters
|
Serial number
|
parameter name
|
unit
|
Specifications
|
|
1
|
Rated voltage
|
kV
|
12
|
|
2
|
Rated current
|
A
|
630
|
1000, 1250
|
1250, 1600, 2000, 2500, 3150
|
|
3
|
Rated short-circuit breaking current
|
kA
|
20
|
25
|
20
|
25
|
31.5
|
31.5
|
40
|
|
4
|
Rated peak withstand current
|
kA
|
50
|
63
|
50
|
63
|
80
|
80
|
100
|
|
5
|
Rated short-time withstand current
|
kA
|
20
|
25
|
20
|
25
|
31.5
|
31.5
|
40
|
|
6
|
Rated short circuit closing current
|
kA
|
50
|
63
|
50
|
63
|
80
|
80
|
100
|
|
7
|
Rated short circuit duration
|
S
|
4
|
|
8
|
Short circuit current breaking times
|
Times
|
50 (40 times for 40kA)
|
|
9
|
Rated operation sequence
|
|
O-0.3s-CO-180s-CO, O-180s-CO-180s-CO (40kA)
|
|
10
|
Rated single / back to back capacitor bank breaking current
|
A
|
630/400 (800/400 for 40kA)
|
|
11
|
Rated capacitor bank
|
KA
|
12.5 (frequency is not more than 1000Hz)
|
|
12
|
Mechanical life
|
Times
|
20000
|
|
13
|
Rated current breaking times
|
Times
|
20000
|
|
14
|
Rated lightning impulse withstand voltage (full wave)
|
kV
|
75
|
|
15
|
Rated short-duration power frequency withstand voltage
|
kV/min
|
42
|
|
16
|
Arcing time
|
Ms
|
≤15
|
|
17
|
Full break time
|
Ms
|
≤80
|
2.2. Mechanical parameters are shown in Table 2.
Table 2 Mechanical parameters
|
Serial number
|
parameter name
|
unit
|
Parameter
|
|
2
|
Contact stroke
|
Mm
|
11±1
|
|
3
|
Contact overtravel
|
Mm
|
4±1
|
|
4
|
Closing speed
|
m/s
|
0.6±0.2
|
|
5
|
Opening speed
|
m/s
|
1.0±0.2
|
|
6
|
Contact closing bounce time
|
Ms
|
≤ 2 (40kA is ≤ 3)
|
|
8
|
Three-phase contact closing and opening synchronization
|
Ms
|
≤2
|
|
9
|
Closing time
|
Ms
|
≤80
|
|
10
|
Opening time
|
Ms
|
≤50
|
|
11
|
Energy storage time (first charge)
|
s
|
<10
|
|
12
|
Closing control voltage
|
V
|
∽ 110, ∽ 220
|
|
13
|
Opening control voltage
|
V
|
∽ 110, ∽ 220
|
|
14
|
Main loop resistance
|
μΩ
|
≤60(630A), ≤45(1250A),
≤35 (1600~2000A), ≤25 (more than 2500)
|
|
15
|
Phase spacing
|
Mm
|
210 (20~31.5kA), 275 (40kA)
|
|
16
|
Closing contact contact pressure
|
N
|
2000±200 (20kA), 2400±200 (25kA),
3100±200 (31.5kA), 4250±250 (40kA)
|
|
17
|
Dynamic and static contacts allow wear cumulative thickness
|
Mm
|
3
|
3. Structure and working principle of permanent magnet mechanism:
3.1. Vacuum circuit breaker pole structure
VMS ( VS1 ) round series indoor vacuum circuit breaker is equipped with ceramic vacuum interrupter, which is intermediate sealing or primary sealing and extinguishing chamber. Both copper-chromium contact material and cup-shaped longitudinal magnetic field contact structure are used. The electrical wear rate of the contact is small, the electrical life is long, the contact withstand voltage is high, and the dielectric insulation strength is stable. After the arc, the recovery is rapid, the interception level is low, and the breaking ability is strong.
The overall structure of the VMS ( VS1 ) round series indoor vacuum circuit breaker adopts the form of the operating mechanism and the arc extinguishing chamber before and after. The main conductive circuit is a three-phase floor-standing structure. The vacuum interrupter is longitudinally mounted in a tubular insulating cylinder which is molded by epoxy resin using an APG process and is therefore particularly resistant to creepage. This structural design also reduces the accumulation of dust on the surface of the arc extinguishing chamber. Effectively prevent the vacuum interrupter from being affected by external factors.
VMS ( VS1 ) round series indoor vacuum circuit breaker can also be installed with solid-sealed arc-extinguishing chamber pole according to user requirements. It will fix the vacuum interrupter inside the insulating pole through special process, which reduces the assembly adjustment and improves the assembly. The mechanical reliability effectively prevents the defects of the ground insulation from being easily polluted and condensed, and protects the vacuum interrupter from external impact.
3.2. Structure of the permanent magnet operating mechanism
The VMS ( VS1 ) round series indoor vacuum permanent magnet breaker mechanism adopts modular design, which mainly includes permanent magnet operating mechanism, control part and energy storage part. The structure of the permanent magnet operating mechanism is shown in Figure 1. The bistable structure is applied, and an advanced permanent magnet design theory, a high magnetic energy NdFeB rare earth material is applied, and a perfect manufacturing process is combined.
Compared with the conventional spring operating mechanism of the circuit breaker, the number of parts of the permanent magnet mechanism is reduced by 70%. As the number of parts is reduced, the probability of failure is reduced and the reliability is further improved. In addition, the permanent magnet mechanism is very suitable for performing. Intelligent control and operation to facilitate the intelligentization of circuit breakers.
Due to the very small number of moving parts, the permanent magnet operating mechanism eliminates the complicated mechanical locking and tripping system, so it has an irreplaceable advantage: less failure, reliability, long life (up to 100,000 times), no lubrication, very Applicable to some occasions requiring high reliability and frequent operation, such as power supply, coal mine, steel making, railway, etc.
(3) VMS (VS1) (□-12/1250-31.5) type - square mechanism
1. Overview:
The VMS ( VSl ) square type AC high voltage indoor permanent magnetic actuator vacuum circuit breaker for the 12kV air-insulated indoor switchgear, as network equipment, industrial and mining enterprises power equipment protection and control means for opening and closing various properties The power load is suitable for power grid construction and renovation projects such as urban power grids, rural power grids, mines and railways, especially for occasions with frequent operation within the working current range and certain requirements for the number of short-circuit breaking operations. The product absorbs advanced technology and technology at home and abroad, and has the characteristics of intelligence, high reliability, long life and maintenance-free. It is environmentally friendly when it is used without pollution to the surrounding environment.
The VMS ( VSl ) square type high-voltage vacuum circuit breaker user to make frequent operation, and having the ability to fast breaking several reclosing. The circuit breaker can be used as a fixed installation unit or a special propulsion mechanism to form a handcart unit.
The VMS ( VSl ) square type permanent magnetic actuator and vacuum circuit breaker vacuum interrupter disposed front and rear, leading electrical circuit for the floor structure, the upper and lower out of the holder and the vacuum interrupter is mounted on a tubular insulating cylinder Inside. The insulating cylinder is made of epoxy resin by APG process. This structure makes the surface of the vacuum interrupter not accumulate dust and avoids damage from external factors, ensuring that the product is still good under damp heat and severe pollution. Insulation properties.
This product complies with GB1984 "High Voltage AC Circuit Breaker", JB3855-85 "10kV Indoor Interlock High Voltage Vacuum Circuit Breaker", DL403-91 "10-35kV Indoor High Voltage Vacuum Circuit Breaker Ordering Technical Conditions" and related IEC standards, and Has a reliable interlock function.
2. Technical parameters :
2.1. Technical parameters are shown in Table 1.
Table 1 Technical parameters
|
Serial number
|
parameter name
|
unit
|
Specifications
|
|
1
|
Rated voltage
|
kV
|
12
|
|
2
|
Rated current
|
A
|
630
|
1000, 1250
|
1250, 1600, 2000, 2500, 3150
|
|
3
|
Rated short-circuit breaking current
|
kA
|
20
|
25
|
20
|
25
|
31.5
|
31.5
|
40
|
|
4
|
Rated peak withstand current
|
kA
|
50
|
63
|
50
|
63
|
80
|
80
|
100
|
|
5
|
Rated short-time withstand current
|
kA
|
20
|
25
|
20
|
25
|
31.5
|
31.5
|
40
|
|
6
|
Rated short circuit closing current
|
kA
|
50
|
63
|
50
|
63
|
80
|
80
|
100
|
|
7
|
Rated short circuit duration
|
S
|
4
|
|
8
|
Short circuit current breaking times
|
Times
|
50 (40 times for 40kA)
|
|
9
|
Rated operation sequence
|
|
O-0.3s-CO-180s-CO, O-180s-CO-180s-CO (40kA)
|
|
10
|
Rated single / back to back capacitor bank breaking current
|
A
|
630/400 (800/400 for 40kA)
|
|
11
|
Rated capacitor bank
|
KA
|
12.5 (frequency is not more than 1000Hz)
|
|
12
|
Mechanical life
|
Times
|
20000
|
|
13
|
Rated current breaking times
|
Times
|
20000
|
|
14
|
Rated lightning impulse withstand voltage (full wave)
|
kV
|
75
|
|
15
|
Rated short-duration power frequency withstand voltage
|
kV/min
|
42
|
|
16
|
Arcing time
|
Ms
|
≤15
|
|
17
|
Full break time
|
Ms
|
≤80
|
2.2. Mechanical parameters are shown in Table 2.
Table 2 Mechanical parameters
|
Serial number
|
parameter name
|
unit
|
Parameter
|
|
2
|
Contact stroke
|
Mm
|
11±1
|
|
3
|
Contact overtravel
|
Mm
|
4±1
|
|
4
|
Closing speed
|
m/s
|
0.6±0.2
|
|
5
|
Opening speed
|
m/s
|
1.0±0.2
|
|
6
|
Contact closing bounce time
|
Ms
|
≤ 2 (40kA is ≤ 3)
|
|
8
|
Three-phase contact closing and opening synchronization
|
Ms
|
≤2
|
|
9
|
Closing time
|
Ms
|
≤80
|
|
10
|
Opening time
|
Ms
|
≤50
|
|
11
|
Energy storage time (first charge)
|
s
|
<10
|
|
12
|
Closing control voltage
|
V
|
∽ 110, ∽ 220
|
|
13
|
Opening control voltage
|
V
|
∽ 110, ∽ 220
|
|
14
|
Main loop resistance
|
μΩ
|
≤60(630A), ≤45(1250A),
≤35 (1600~2000A), ≤25 (more than 2500)
|
|
15
|
Phase spacing
|
Mm
|
210 (20~31.5kA), 275 (40kA)
|
|
16
|
Closing contact contact pressure
|
N
|
2000±200 (20kA), 2400±200 (25kA),
3100±200 (31.5kA), 4250±250 (40kA)
|
|
17
|
Dynamic and static contacts allow wear cumulative thickness
|
Mm
|
3
|
3.1. Vacuum circuit breaker pole structure
The VMS ( VSl ) square type magnetic field vacuum interrupter contact structure is equipped with series indoor ceramic vacuum interrupter chamber, an intermediate seal or a closure row interrupter, contact materials are made of copper-chromium, vertical cup. The electrical wear rate of the contact is small, the electrical life is long, the contact withstand voltage is high, and the dielectric insulation strength is stable. After the arc, the recovery is rapid, the interception level is low, and the breaking ability is strong.
The VMS ( VSl ) square type vacuum circuit breaker series indoor overall structure of the operating mechanism and the front and rear arc extinguishing chamber disposed in the form of a three-phase electrical circuit leading floor structure. Vacuum interrupter installed in a longitudinal direction of the tubular insulating tube, the insulating tube using an epoxy resin cast into APG process type , and therefore particularly resistant to creepage. This structural design also reduces the accumulation of dust on the surface of the arc extinguishing chamber. Effectively prevent the vacuum interrupter from being affected by external factors.
The VMS ( VSl ) square type series indoor vacuum circuit breaker according to user requirements can also be mounted fixed sealing pole arc chamber, the vacuum interrupter it through a special process is fixed inside the insulating pole, control element assembly is reduced, improving The mechanical reliability effectively prevents the defects of the ground insulation from being easily polluted and condensed, and protects the vacuum interrupter from external impact.
3.2. Structure of the permanent magnet operating mechanism
The VMS ( VSl ) square type vacuum circuit breaker mechanism part of the permanent series indoor modular design, wherein the operating mechanism includes a permanent magnet, the control section, storage section. The structure of the permanent magnet operating mechanism is shown in Figure 1. The permanent magnet mechanism adopts a bistable structure, adopts an advanced permanent magnet design theory, a high magnetic energy NdFeB rare earth material, and combines a perfect manufacturing process.
Compared with the conventional spring operating mechanism of the circuit breaker, the number of parts of the permanent magnet mechanism is reduced by 70%. As the number of parts is reduced, the probability of failure is reduced and the reliability is further improved. In addition, the permanent magnet mechanism is very suitable for performing. Intelligent control and operation to facilitate the intelligentization of circuit breakers.
Due to the very small number of moving parts, the permanent magnet operating mechanism eliminates the complicated mechanical locking and tripping system, so it has an irreplaceable advantage: less failure, reliability, long life (up to 100,000 times), no lubrication, very Applicable to some occasions requiring high reliability and frequent operation, such as power supply, coal mine, steel making, railway, etc.
Figure 1 permanent magnet mechanism structure diagram (omitted)
Principle of bistable mechanism (omitted)
The magnetic energy generated by the energized split and closing coils drives the upper and lower movements of the iron core to complete the opening and closing operations, and the moving iron core is kept open at the movable magnetic core and the static iron core through the magnetic field energy generated by the low reluctance passage. Or close the two positions, no additional energy is required. The illustration is a schematic diagram of a permanent magnet drive mechanism of a bistable coil structure. It consists of a static iron core, a moving iron core, a permanent magnet, a ram, a closing coil, a trip coil and an auxiliary connecting rod. The moving iron core and the static iron core generate strong magnetic energy through the low reluctance channel, and keep the moving iron core at the lower end or the upper end position; the magnetic force generated by the closing coil and the opening coil of the current can move the moving iron core upward or downward, Complete the closing and opening operations.
3.4. Permanent magnet mechanism controller
NKY300 permanent magnet switch controller
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Please read this manual carefully before the product is put into operation!
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The information in this document is subject to change without notice. The information in this document should not be regarded as a commitment of Guangzhou Guoneng Automation Technology Co., Ltd. Guangzhou Guoneng Automatic Control Technology Co., Ltd. may appear in this article. The error does not assume any responsibility.
Copyright@Guangzhou Guoneng Automatic Control Technology Co., Ltd.
First, the controller overview
NKY300 permanent magnet switch controller, built-in capacitor / 12V to 300V booster board / permanent magnet mechanism drive board, mainly used in various permanent magnet vacuum contactors, circuit breakers, reclosers, and mines in 10KV, 35KV distribution lines In the vacuum circuit breaker, the closing and opening process of the permanent magnet switch is controlled. AC and DC universal.
Dimensions are 300* wide 200mm high 160mm high and weigh 1kg
Second, the model description NKY-300 single coil (single bistable), double coil (single bistable) can be customized according to user requirements for a variety of special features.
Third, the main features
Structural principle
The external DC DC12V2A (maximum 12V3A) is used to power the booster board, and the 40w booster board boosts the 12V to 300V to charge the capacitor.
After receiving the 12V (1A or less) opening or closing signal, the driver board outputs 300V 20ms DC pulse to the permanent magnet mechanism coil.
Characteristics
1, 1us high-speed start, from the input signal trigger to the capacitor output energy to the coil 1us.
2. Timing output 20ms pulse, after a single signal input, output a timing 300V 20ms pulse to the coil.
3, short circuit protection anti-blocking, built-in detection of current components, when the coil current is greater than 500A, stop output within 3us
4. The PWM starts and shuts down, which can effectively protect the control components.
5, over voltage feedback charging, can effectively prevent over voltage.
6, high efficiency charge and discharge control, low capacitance of capacitors, can meet the requirements of switch coincidence.
7. Adjustable output power, the output voltage can be adjusted by adjusting the W503 of the booster board to achieve the purpose of adjusting the output of the mechanism.
8. The closing and closing signal input interlocks the anti-double-pass, and the input of the closing and closing signals is prohibited from being input at the same time, otherwise the signal input end is burned out.
Wiring instructions:
It is forbidden to load the opening and closing signals at the same time.
DC12V power supply and signal pin can only input DC power supply, voltage range +-10%
(Cannot enter communication).
Note that the internal circuit of the controller has 300V. Even after the 12V power supply and the signal is disconnected, there is still 300V inside the capacitor. Please do not touch it, pay attention to safety.
The circuit breaker adopts the YCK380 permanent magnet mechanism controller of our company . The switch controller is applied to the high-voltage vacuum circuit breaker control operating mechanism to control the closing and opening process of the circuit breaker, and provide suitable operation for closing and opening coils. Voltage and current.
The controller adopts advanced power electronic control technology and IGBT with higher voltage and current margin. At the same time, the controller has automatic detection function, which can detect and timely alarm and block the switch operation for the internal fault of the device and the fault of the switch body. The controller also has perfect logic blocking and anti-jump function. According to our special requirements in China, it also has free tripping logic, which fully meets the requirements of our national standard. When the closing circuit voltage is lower than the required value, the closing switch is blocked and an alarm message is issued to prevent the occurrence of malfunction as much as possible. The controller has the following features:
3.4.1. Flexible setting. Through the communication interface side feces setting: a control pulse time limit, in place closing delay, undervoltage control voltage value and the like.
3.4.2. Intelligent communication interface. The device has an intelligent communication interface, which can complete the three-remote function and meet the requirements of intelligent electrical equipment.
3.4.3. Anti-interference ability in accordance with international standards. The controller can withstand EMI tests such as Class IV fast transients, surges, and surge withstand voltage, and has strong local working ability.
The energy storage module uses capacitor energy storage, which has the characteristics of short energy storage time and long service life, and its service life can be more than 10 years.
3.6 Overcurrent protection: The circuit breaker can be equipped with a reliable overcurrent protection device, which is set by the current transformer.
4. Dimensions and electrical wiring schematics
4.1 The dimensions of the handcart are shown in Figures 2a and 2b. (slightly)
4.2 The fixed dimensions are shown in Figure 3. (slightly)
4.3 The schematic diagram of the hand-carrying electrical wiring is shown in Figure 4. (slightly)
4.4 The schematic diagram of the fixed electrical wiring is shown in Figure 5. (slightly)
(4) VBM-12/1250-31.5 type
(5) ZNL –10/630-12.5 type (mineral circuit breaker)
ELECTRIC
