WO2024032034A1 - Device for rapidly recovering insulation of large motor - Google Patents

Device for rapidly recovering insulation of large motor Download PDF

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Publication number
WO2024032034A1
WO2024032034A1 PCT/CN2023/090847 CN2023090847W WO2024032034A1 WO 2024032034 A1 WO2024032034 A1 WO 2024032034A1 CN 2023090847 W CN2023090847 W CN 2023090847W WO 2024032034 A1 WO2024032034 A1 WO 2024032034A1
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WO
WIPO (PCT)
Prior art keywords
thyristor
anode
group
cathode
rectifier bridge
Prior art date
Application number
PCT/CN2023/090847
Other languages
French (fr)
Chinese (zh)
Inventor
董高义
翁文
叶知文
陈瑜
梁弘轩
陈瑞
林怡玢
Original Assignee
华能(福建)能源开发有限公司清洁能源分公司
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Publication date
Application filed by 华能(福建)能源开发有限公司清洁能源分公司 filed Critical 华能(福建)能源开发有限公司清洁能源分公司
Priority to JP2023600112U priority Critical patent/JP3248686U/en
Publication of WO2024032034A1 publication Critical patent/WO2024032034A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • 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
    • H02H7/10—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 converters; for rectifiers
    • H02H7/12—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 converters; for rectifiers for static converters or rectifiers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/145—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M7/155—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only

Definitions

  • the utility model relates to a device for quickly restoring the insulation of large motors and belongs to the technical field of motor maintenance.
  • the air humidity is high and the salt content is high.
  • the stator coils are particularly susceptible to moisture, causing the motor insulation resistance to be lower than the commissioning standard.
  • the existing technology uses high-power "baking lamps” to heat the inside of the motor from the outside to the inside, taking away the moisture inside the motor.
  • the recovery speed of the motor insulation is extremely slow, causing the important auxiliary machinery of the power plant to not be “put into operation” in time, and important auxiliary machinery to be lost. backup, seriously affecting the safe operation of the unit; in addition, the temperature around the "baking lamp” is very high, and there are combustibles such as oil and vapor inside the motor, which is prone to fire and poses major safety hazards.
  • this utility model provides a device for quickly restoring the insulation of large motors.
  • the device adopts a technical method in which the stator coil directly passes low voltage and high current.
  • the stator coil directly generates heat and quickly restores the insulation resistance from the inside out.
  • a device for quickly restoring the insulation of large motors including a low-voltage AC power supply and a rectifier device.
  • the low-voltage AC power supply provides low-voltage AC power to the rectifier device.
  • the rectifier device outputs a DC voltage to the motor to be restored after rectification; the rectifier device It includes three groups of thyristor rectifier bridges.
  • Each group of thyristor rectifier bridges includes a coil and 4 thyristors; the anode of the first thyristor of each group of thyristor rectifier bridge is connected to the cathode of the second thyristor, and the anode of the third thyristor is connected to the cathode of the fourth thyristor.
  • the cathode of the thyristor is connected, the cathode of the first thyristor is connected to the cathode of the third thyristor, the anode of the second thyristor is connected to the anode of the fourth thyristor, and one end of the coil is connected to the first
  • the anode of each thyristor is connected, and the other end is connected to the anode of the third thyristor, and the induced voltages generated by the three groups of thyristor rectifier bridges in the coils have the same direction;
  • the anode of the second thyristor of the first group of thyristor rectifier bridges The cathode of the first thyristor of the second group of thyristor rectifier bridge is connected to the anode of the second thyristor of the second group of thyristor rectifier bridge and the cathode of the first thyristor of the third group of thy
  • the cathode of the first thyristor of the first group of thyristor rectifier bridge and the anode of the second thyristor of the third group of thyristor rectifier bridge are connected to any two phases of the motor to be restored.
  • a voltage acquisition device and a display are included, and the voltage acquisition device is respectively connected to the cathode of the first thyristor of the first group of thyristor rectifier bridges and the anode of the second thyristor of the third group of thyristor rectifier bridges. , collecting the output voltage of the rectifier device; the voltage collecting device and the display are electrically connected.
  • a coil is further provided between the cathode of the first thyristor of the first group of thyristor rectifier bridges or the anode of the second thyristor of the third group of thyristor rectifier bridges and the motor to be restored.
  • an ammeter is provided between the cathode of the first thyristor of the first group of thyristor rectifier bridges or the anode of the second thyristor of the third group of thyristor rectifier bridges and the motor to be restored.
  • an overcurrent protection switch is provided between the cathode of the first thyristor of the first group of thyristor rectifier bridges or the anode of the second thyristor of the third group of thyristor rectifier bridges and the motor to be restored.
  • the low-voltage AC power supply is 220V AC power supply.
  • This device uses a technical method of directly passing low voltage and high current to the stator coil to directly heat the stator coil and quickly restore the insulation resistance from the inside out. It solves the shortcomings of the traditional "baking lamp” method of slow insulation recovery and high local overtemperature and high fire risk. At the same time, the device has three-speed adjustment, which can adjust the output voltage according to needs.
  • Figure 1 is a schematic diagram of the module structure of an embodiment of the present utility model.
  • Figure 2 is a circuit diagram of a rectifier device according to an embodiment of the present invention.
  • Figure 3 is a schematic diagram of the circuit during installation of the embodiment of the present invention.
  • a device for quickly restoring the insulation of large motors includes a low-voltage AC power supply 1 and a rectifier device 2.
  • the low-voltage AC power supply 1 provides low-voltage AC power to the rectifier device 2.
  • the rectifier device 2 rectifies the The motor 3 to be restored outputs a DC voltage;
  • the rectifier device 2 includes three groups of thyristor rectifier bridges, each group of thyristor rectifier bridges includes a coil and four thyristors; the anode of the first thyristor of each group of thyristor rectifier bridge and the anode of the second thyristor
  • the cathode is connected, the anode of the third thyristor is connected to the cathode of the fourth thyristor, the cathode of the first thyristor is connected to the cathode of the third thyristor, the anode of the second thyristor is connected to the cathode of the fourth
  • the anodes of the three thyristors are connected, one end of the coil is connected to the anode of the first thyristor, and the other end is connected to the anode of the third thyristor, and the induced voltages generated by the three sets of thyristor rectifier bridges in the coils have the same direction;
  • the first The anode of the second thyristor of the thyristor rectifier bridge group is connected to the cathode of the first thyristor of the thyristor rectifier bridge group of the second group, and the anode of the second thyristor of the thyristor rectifier bridge group of the second group is connected to the cathode of the first thyristor of the third group of thyristor rectifier bridge
  • the cathode of the first thyristor of the thyristor rectifier bridge is connected; the cathode of the first thyristor of the first group of thyristor
  • a DC voltage is output through the cathode of the first thyristor of the first group of thyristor rectifier bridge and the anode of the second thyristor of the third group of thyristor rectifier bridge.
  • the cathode of the first thyristor and the anode of the second thyristor of the third group of thyristor rectifier bridge are connected to any two phases of the motor 3 to be restored, so that the stator coil between the two phases directly generates heat. After completion, the first group of thyristors will be rectified.
  • the cathode of the first thyristor of the bridge and the anode of the second thyristor of the third group of thyristor rectifier bridge are connected to the other two phases of the motor 3 to be restored until all stator coils are restored.
  • the present invention also includes a voltage acquisition device 4 and a display 5.
  • the voltage acquisition device 4 is connected to the cathode of the first thyristor of the first group of thyristor rectifier bridge and the third group of thyristor rectifier bridge respectively.
  • the anode of the second thyristor of the bridge is connected to collect the output voltage of the rectifier device; the voltage collecting device 4 and the display 5 are electrically connected. Used to monitor DC output voltage for easy control.
  • the cathode of the first thyristor of the first group of thyristor rectifier bridge or the anode of the second thyristor of the third group of thyristor rectifier bridge is between the cathode of the first thyristor of the first group of thyristor rectifier bridge and the motor 3 to be restored. There are also coils in between.
  • the cathode of the first thyristor of the first group of thyristor rectifier bridge or the anode of the second thyristor of the third group of thyristor rectifier bridge is between the cathode of the first thyristor of the first group of thyristor rectifier bridge and the motor 3 to be restored. There is also an ammeter in the room.
  • the cathode of the first thyristor of the first group of thyristor rectifier bridge or the anode of the second thyristor of the third group of thyristor rectifier bridge is between the cathode of the first thyristor of the first group of thyristor rectifier bridge and the motor 3 to be restored.
  • the low-voltage AC power supply 1 is a 220V AC power supply. 220V AC power is easily accessible.
  • the DC output voltage is changed by controlling each thyristor.
  • the maximum output voltage of the rectifier device is V MAX .
  • V MAX The maximum output voltage of the rectifier device.
  • the third and fourth thyristors of the second group of thyristor rectifier bridge and the third group of thyristor rectifier bridge are turned on ( As shown in VT 23 , VT 24 , VT 33 and VT 34 in Figure 2), by controlling the firing angle of the first group of thyristor rectifier bridge thyristors, the output DC voltage can be adjusted between 0-1/3V MAX .
  • the firing angle of the first group of thyristor rectifier bridge thyristors is 0°.
  • the output DC voltage can be adjusted between 1/3V MAX -2/3V MAX .
  • the firing angle of the first group of thyristor rectifier bridge and the second group of thyristor rectifier bridge thyristors be 0°, and control the thyristor of the third group of thyristor rectifier bridge.
  • the firing angle can adjust the output DC voltage between 2/3V MAX -V MAX .

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

The present utility model relates to a device for rapidly recovering insulation of a large motor, comprising a rectifying device. The rectifying device comprises three sets of thyristor rectifier bridges. Each set of thyristor rectifier bridge comprises a coil and four thyristors; an anode of the first thyristor is connected to a cathode of the second thyristor; an anode of the third thyristor is connected to a cathode of the fourth thyristor; a cathode of the first thyristor is connected to a cathode of the third thyristor; an anode of the second thyristor is connected to an anode of the fourth thyristor; one end of the coil is connected to the anode of the first thyristor, and the other end of the coil is connected to the anode of the third thyristor; the anode of the second thyristor in the first set of thyristor rectifier bridge is connected to the cathode of the first thyristor in the second set of thyristor rectifier bridge; and the anode of the second thyristor in the second set of thyristor rectifier bridge is connected to the cathode of the first thyristor in the third set of thyristor rectifier bridge. The present utility model uses a technical mode of directly introducing a low voltage and a large current into a stator coil, such that the stator coil is directly heated, and insulation resistance is rapidly recovered from inside to outside.

Description

一种快速恢复大型电动机绝缘的装置A device for quickly restoring the insulation of large electric motors 技术领域Technical field
本实用新型涉及一种快速恢复大型电动机绝缘的装置，属于电动机维修技术领域。The utility model relates to a device for quickly restoring the insulation of large motors and belongs to the technical field of motor maintenance.
背景技术Background technique
在沿海电厂空气湿度大盐分高，在大型电动机长期停运或者检修过程中，定子线圈特别容易受潮，导致电机绝缘电阻低于投运标准。现有技术是采用大功率“烤灯”，由外而内加热电动机内部，带走电动机内部潮汽，电动机绝缘恢复速度极慢，导致电厂重要辅机不能及时“投运”，重要辅机失去备用，严重影响到机组的安全运行；除此之外，“烤灯”周边的温度非常高，电动机内部存在油汽等可燃物，容易发生火灾，有重大的安全隐患。In coastal power plants, the air humidity is high and the salt content is high. During long-term outages or maintenance of large motors, the stator coils are particularly susceptible to moisture, causing the motor insulation resistance to be lower than the commissioning standard. The existing technology uses high-power "baking lamps" to heat the inside of the motor from the outside to the inside, taking away the moisture inside the motor. The recovery speed of the motor insulation is extremely slow, causing the important auxiliary machinery of the power plant to not be "put into operation" in time, and important auxiliary machinery to be lost. backup, seriously affecting the safe operation of the unit; in addition, the temperature around the "baking lamp" is very high, and there are combustibles such as oil and vapor inside the motor, which is prone to fire and poses major safety hazards.
实用新型Utility model
为了克服上述问题，本实用新型提供一种快速恢复大型电动机绝缘的装置，该装置采用定子线圈直接通低电压、大电流的技术方式，定子线圈直接发热，由内而外快速恢复绝缘电阻。In order to overcome the above problems, this utility model provides a device for quickly restoring the insulation of large motors. The device adopts a technical method in which the stator coil directly passes low voltage and high current. The stator coil directly generates heat and quickly restores the insulation resistance from the inside out.
本实用新型的技术方案如下：The technical solution of the present utility model is as follows:
一种快速恢复大型电动机绝缘的装置，包括低压交流电源和整流装置，所述低压交流电源为所述整流装置提供低压交流电，所述整流装置整流后向待恢复电动机输出直流电压；所述整流装置包括三组晶闸管整流桥，每组晶闸管整流桥包括线圈和4个晶闸管；每组晶闸管整流桥的第一个晶闸管的阳极与第二个晶闸管的阴极连接，第三个晶闸管的阳极和第四个晶闸管的阴极连接，所述第一个晶闸管的阴极和所述第三个晶闸管的阴极连接，所述第二个晶闸管的阳极和所述第四个晶闸管的阳极连接，线圈一端和所述第一个晶闸管的阳极连接，另一端和所述第三个晶闸管的阳极连接，且三组晶闸管整流桥在线圈中产生的感应电压方向相同；第一组晶闸管整流桥的所述第二个晶闸管的阳极和第二组晶闸管整流桥的所述第一个晶闸管的阴极连接，第二组晶闸管整流桥的所述第二个晶闸管的阳极和第三组晶闸管整流桥的所述第一个晶闸管的阴极连接；第一组晶闸管整流桥的所述第一个晶闸管的阴极和第三组晶闸管整流桥的所述第二个晶闸管的阳极与所述待恢复电动机的任意两相相连。A device for quickly restoring the insulation of large motors, including a low-voltage AC power supply and a rectifier device. The low-voltage AC power supply provides low-voltage AC power to the rectifier device. The rectifier device outputs a DC voltage to the motor to be restored after rectification; the rectifier device It includes three groups of thyristor rectifier bridges. Each group of thyristor rectifier bridges includes a coil and 4 thyristors; the anode of the first thyristor of each group of thyristor rectifier bridge is connected to the cathode of the second thyristor, and the anode of the third thyristor is connected to the cathode of the fourth thyristor. The cathode of the thyristor is connected, the cathode of the first thyristor is connected to the cathode of the third thyristor, the anode of the second thyristor is connected to the anode of the fourth thyristor, and one end of the coil is connected to the first The anode of each thyristor is connected, and the other end is connected to the anode of the third thyristor, and the induced voltages generated by the three groups of thyristor rectifier bridges in the coils have the same direction; the anode of the second thyristor of the first group of thyristor rectifier bridges The cathode of the first thyristor of the second group of thyristor rectifier bridge is connected to the anode of the second thyristor of the second group of thyristor rectifier bridge and the cathode of the first thyristor of the third group of thyristor rectifier bridge. ; The cathode of the first thyristor of the first group of thyristor rectifier bridge and the anode of the second thyristor of the third group of thyristor rectifier bridge are connected to any two phases of the motor to be restored.
进一步的，还包括电压采集装置和显示器，所述电压采集装置分别与第一组晶闸管整流桥的所述第一个晶闸管的阴极、第三组晶闸管整流桥的所述第二个晶闸管的阳极连接，采集所述整流装置的输出电压；所述电压采集装置和所述显示器电连接。Further, a voltage acquisition device and a display are included, and the voltage acquisition device is respectively connected to the cathode of the first thyristor of the first group of thyristor rectifier bridges and the anode of the second thyristor of the third group of thyristor rectifier bridges. , collecting the output voltage of the rectifier device; the voltage collecting device and the display are electrically connected.
进一步的，第一组晶闸管整流桥的所述第一个晶闸管的阴极或第三组晶闸管整流桥的所述第二个晶闸管的阳极与所述待恢复电动机之间还设置有线圈。Further, a coil is further provided between the cathode of the first thyristor of the first group of thyristor rectifier bridges or the anode of the second thyristor of the third group of thyristor rectifier bridges and the motor to be restored.
进一步的，第一组晶闸管整流桥的所述第一个晶闸管的阴极或第三组晶闸管整流桥的所述第二个晶闸管的阳极与所述待恢复电动机之间还设置有电流表。Further, an ammeter is provided between the cathode of the first thyristor of the first group of thyristor rectifier bridges or the anode of the second thyristor of the third group of thyristor rectifier bridges and the motor to be restored.
进一步的，第一组晶闸管整流桥的所述第一个晶闸管的阴极或第三组晶闸管整流桥的所述第二个晶闸管的阳极与所述待恢复电动机之间还设置有过电流保护开关。Furthermore, an overcurrent protection switch is provided between the cathode of the first thyristor of the first group of thyristor rectifier bridges or the anode of the second thyristor of the third group of thyristor rectifier bridges and the motor to be restored.
进一步的，所述低压交流电源为220V交流电源。Further, the low-voltage AC power supply is 220V AC power supply.
本实用新型具有如下有益效果：The utility model has the following beneficial effects:
该装置通过对定子线圈直接通低电压、大电流的技术方式，使定子线圈直接发热，由内而外快速恢复绝缘电阻。解决了传统“烤灯”方式绝缘恢复慢、局部超温和火灾风险高的弊端。同时，该装置具有三挡调节，能够根据需要，对输出电压进行调节。This device uses a technical method of directly passing low voltage and high current to the stator coil to directly heat the stator coil and quickly restore the insulation resistance from the inside out. It solves the shortcomings of the traditional "baking lamp" method of slow insulation recovery and high local overtemperature and high fire risk. At the same time, the device has three-speed adjustment, which can adjust the output voltage according to needs.
附图说明Description of drawings
图1为本实用新型实施例的模块结构示意图。Figure 1 is a schematic diagram of the module structure of an embodiment of the present utility model.
图2为本实用新型实施例的整流装置电路图。Figure 2 is a circuit diagram of a rectifier device according to an embodiment of the present invention.
图3为本实用新型实施例安装时的电路示意图。Figure 3 is a schematic diagram of the circuit during installation of the embodiment of the present invention.
图中附图标记表示为：The reference marks in the figure are:
1、低压交流电源；2、整流装置；3、待恢复电动机；4、电压采集装置；5、显示器。1. Low-voltage AC power supply; 2. Rectifier device; 3. Motor to be restored; 4. Voltage acquisition device; 5. Display.
实施方式Implementation
下面结合附图和具体实施例来对本实用新型进行详细的说明。The utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.
参见图1-3，一种快速恢复大型电动机绝缘的装置，包括低压交流电源1和整流装置2，所述低压交流电源1为所述整流装置2提供低压交流电，所述整流装置2整流后向待恢复电动机3输出直流电压；所述整流装置2包括三组晶闸管整流桥，每组晶闸管整流桥包括线圈和4个晶闸管；每组晶闸管整流桥的第一个晶闸管的阳极与第二个晶闸管的阴极连接，第三个晶闸管的阳极和第四个晶闸管的阴极连接，所述第一个晶闸管的阴极和所述第三个晶闸管的阴极连接，所述第二个晶闸管的阳极和所述第四个晶闸管的阳极连接，线圈一端和所述第一个晶闸管的阳极连接，另一端和所述第三个晶闸管的阳极连接，且三组晶闸管整流桥在线圈中产生的感应电压方向相同；第一组晶闸管整流桥的所述第二个晶闸管的阳极和第二组晶闸管整流桥的所述第一个晶闸管的阴极连接，第二组晶闸管整流桥的所述第二个晶闸管的阳极和第三组晶闸管整流桥的所述第一个晶闸管的阴极连接；第一组晶闸管整流桥的所述第一个晶闸管的阴极和第三组晶闸管整流桥的所述第二个晶闸管的阳极与所述待恢复电动机3的任意两相相连。Referring to Figures 1-3, a device for quickly restoring the insulation of large motors includes a low-voltage AC power supply 1 and a rectifier device 2. The low-voltage AC power supply 1 provides low-voltage AC power to the rectifier device 2. The rectifier device 2 rectifies the The motor 3 to be restored outputs a DC voltage; the rectifier device 2 includes three groups of thyristor rectifier bridges, each group of thyristor rectifier bridges includes a coil and four thyristors; the anode of the first thyristor of each group of thyristor rectifier bridge and the anode of the second thyristor The cathode is connected, the anode of the third thyristor is connected to the cathode of the fourth thyristor, the cathode of the first thyristor is connected to the cathode of the third thyristor, the anode of the second thyristor is connected to the cathode of the fourth thyristor. The anodes of the three thyristors are connected, one end of the coil is connected to the anode of the first thyristor, and the other end is connected to the anode of the third thyristor, and the induced voltages generated by the three sets of thyristor rectifier bridges in the coils have the same direction; the first The anode of the second thyristor of the thyristor rectifier bridge group is connected to the cathode of the first thyristor of the thyristor rectifier bridge group of the second group, and the anode of the second thyristor of the thyristor rectifier bridge group of the second group is connected to the cathode of the first thyristor of the third group of thyristor rectifier bridge The cathode of the first thyristor of the thyristor rectifier bridge is connected; the cathode of the first thyristor of the first group of thyristor rectifier bridge and the anode of the second thyristor of the third group of thyristor rectifier bridge are connected to the to-be-restored Any two phases of motor 3 are connected.
使用时，通过第一组晶闸管整流桥的所述第一个晶闸管的阴极和第三组晶闸管整流桥的所述第二个晶闸管的阳极输出直流电压，第一组晶闸管整流桥的所述第一个晶闸管的阴极和第三组晶闸管整流桥的所述第二个晶闸管的阳极与所述待恢复电动机3的任意两相相连，使两相间的定子线圈直接发热，完成后将第一组晶闸管整流桥的所述第一个晶闸管的阴极和第三组晶闸管整流桥的所述第二个晶闸管的阳极与所述待恢复电动机3的另外两相连接，直至全部定子线圈恢复。When in use, a DC voltage is output through the cathode of the first thyristor of the first group of thyristor rectifier bridge and the anode of the second thyristor of the third group of thyristor rectifier bridge. The cathode of the first thyristor and the anode of the second thyristor of the third group of thyristor rectifier bridge are connected to any two phases of the motor 3 to be restored, so that the stator coil between the two phases directly generates heat. After completion, the first group of thyristors will be rectified. The cathode of the first thyristor of the bridge and the anode of the second thyristor of the third group of thyristor rectifier bridge are connected to the other two phases of the motor 3 to be restored until all stator coils are restored.
通过控制不同晶闸管整流桥晶闸管的触发角，可以实现不同的直流电压输出。By controlling the firing angles of different thyristor rectifier bridge thyristors, different DC voltage outputs can be achieved.
在本实用新型的一种实施方式中，还包括电压采集装置4和显示器5，所述电压采集装置4分别与第一组晶闸管整流桥的所述第一个晶闸管的阴极、第三组晶闸管整流桥的所述第二个晶闸管的阳极连接，采集所述整流装置的输出电压；所述电压采集装置4和所述显示器5电连接。用于监测直流输出电压，便于控制。In one embodiment of the present invention, it also includes a voltage acquisition device 4 and a display 5. The voltage acquisition device 4 is connected to the cathode of the first thyristor of the first group of thyristor rectifier bridge and the third group of thyristor rectifier bridge respectively. The anode of the second thyristor of the bridge is connected to collect the output voltage of the rectifier device; the voltage collecting device 4 and the display 5 are electrically connected. Used to monitor DC output voltage for easy control.
在本实用新型的一种实施方式中，第一组晶闸管整流桥的所述第一个晶闸管的阴极或第三组晶闸管整流桥的所述第二个晶闸管的阳极与所述待恢复电动机3之间还设置有线圈。In one embodiment of the present invention, the cathode of the first thyristor of the first group of thyristor rectifier bridge or the anode of the second thyristor of the third group of thyristor rectifier bridge is between the cathode of the first thyristor of the first group of thyristor rectifier bridge and the motor 3 to be restored. There are also coils in between.
在本实用新型的一种实施方式中，第一组晶闸管整流桥的所述第一个晶闸管的阴极或第三组晶闸管整流桥的所述第二个晶闸管的阳极与所述待恢复电动机3之间还设置有电流表。In one embodiment of the present invention, the cathode of the first thyristor of the first group of thyristor rectifier bridge or the anode of the second thyristor of the third group of thyristor rectifier bridge is between the cathode of the first thyristor of the first group of thyristor rectifier bridge and the motor 3 to be restored. There is also an ammeter in the room.
在本实用新型的一种实施方式中，第一组晶闸管整流桥的所述第一个晶闸管的阴极或第三组晶闸管整流桥的所述第二个晶闸管的阳极与所述待恢复电动机3之间还设置有过电流保护开关。In one embodiment of the present invention, the cathode of the first thyristor of the first group of thyristor rectifier bridge or the anode of the second thyristor of the third group of thyristor rectifier bridge is between the cathode of the first thyristor of the first group of thyristor rectifier bridge and the motor 3 to be restored. There is also an overcurrent protection switch.
在本实用新型的一种实施方式中，所述低压交流电源1为220V交流电源。220V交流电源便于获取。In one embodiment of the present invention, the low-voltage AC power supply 1 is a 220V AC power supply. 220V AC power is easily accessible.
参见图1-3，本实用新型的工作原理如下：Referring to Figures 1-3, the working principle of this utility model is as follows:
本实用新型在使用时，将装置连接完成后，通过控制各晶闸管改变直流输出电压。When the utility model is used, after the device is connected, the DC output voltage is changed by controlling each thyristor.
整流装置的最大输出电压为V MAX，当需要输出的直流电压低于1/3V MAX时，使第二组晶闸管整流桥和第三组晶闸管整流桥的第三个晶闸管和第四个晶闸管导通（如图2的VT 23、VT 24、VT 33和VT 34），通过控制第一组晶闸管整流桥晶闸管的触发角，可使输出的直流电压在0-1/3V MAX之间调整。 The maximum output voltage of the rectifier device is V MAX . When the required output DC voltage is lower than 1/3V MAX , the third and fourth thyristors of the second group of thyristor rectifier bridge and the third group of thyristor rectifier bridge are turned on ( As shown in VT 23 , VT 24 , VT 33 and VT 34 in Figure 2), by controlling the firing angle of the first group of thyristor rectifier bridge thyristors, the output DC voltage can be adjusted between 0-1/3V MAX .
当需要输出的直流电压在1/3V MAX-2/3V MAX之间时，使第三组晶闸管整流桥的第三个晶闸管和第四个晶闸管导通（如图2的VT 33和VT 34），第一组晶闸管整流桥晶闸管的触发角为0°，通过控制第二组晶闸管整流桥晶闸管的触发角，可使输出的直流电压在1/3V MAX-2/3V MAX之间调整。 When the required output DC voltage is between 1/3V MAX -2/3V MAX , turn on the third thyristor and the fourth thyristor of the third group of thyristor rectifier bridge (VT 33 and VT 34 in Figure 2) , the firing angle of the first group of thyristor rectifier bridge thyristors is 0°. By controlling the firing angle of the second group of thyristor rectifier bridge thyristors, the output DC voltage can be adjusted between 1/3V MAX -2/3V MAX .
当需要输出的直流电压在2/3V MAX-V MAX之间时，使第一组晶闸管整流桥和第二组晶闸管整流桥晶闸管的触发角为0°，通过控制第三组晶闸管整流桥晶闸管的触发角，可使输出的直流电压在2/3V MAX-V MAX之间调整。 When the DC voltage to be output is between 2/3V MAX -V MAX , make the firing angle of the first group of thyristor rectifier bridge and the second group of thyristor rectifier bridge thyristors be 0°, and control the thyristor of the third group of thyristor rectifier bridge. The firing angle can adjust the output DC voltage between 2/3V MAX -V MAX .
以上所述仅为本实用新型的实施例，并非因此限制本实用新型的专利范围，凡是利用本实用新型说明书及附图内容所作的等效结构，或直接或间接运用在其他相关的技术领域，均同理包括在本实用新型的专利保护范围内。The above are only examples of the present utility model, and do not limit the patent scope of the present utility model. Any equivalent structure made using the contents of the description and drawings of the present utility model, or directly or indirectly used in other related technical fields, All are similarly included in the patent protection scope of the present utility model.

Claims (6)

  1. 一种快速恢复大型电动机绝缘的装置，其特征在于，包括低压交流电源（1）和整流装置（2），所述低压交流电源（1）为所述整流装置（2）提供低压交流电，所述整流装置（2）整流后向待恢复电动机（3）输出直流电压；所述整流装置（2）包括三组晶闸管整流桥，每组晶闸管整流桥包括线圈和4个晶闸管；每组晶闸管整流桥的第一个晶闸管的阳极与第二个晶闸管的阴极连接，第三个晶闸管的阳极和第四个晶闸管的阴极连接，所述第一个晶闸管的阴极和所述第三个晶闸管的阴极连接，所述第二个晶闸管的阳极和所述第四个晶闸管的阳极连接，线圈一端和所述第一个晶闸管的阳极连接，另一端和所述第三个晶闸管的阳极连接，且三组晶闸管整流桥在线圈中产生的感应电压方向相同；第一组晶闸管整流桥的所述第二个晶闸管的阳极和第二组晶闸管整流桥的所述第一个晶闸管的阴极连接，第二组晶闸管整流桥的所述第二个晶闸管的阳极和第三组晶闸管整流桥的所述第一个晶闸管的阴极连接；第一组晶闸管整流桥的所述第一个晶闸管的阴极和第三组晶闸管整流桥的所述第二个晶闸管的阳极与所述待恢复电动机（3）的任意两相相连。A device for quickly restoring the insulation of large motors, characterized in that it includes a low-voltage AC power supply (1) and a rectifier device (2). The low-voltage AC power supply (1) provides low-voltage AC power to the rectifier device (2). The rectifier device (2) outputs DC voltage to the motor (3) to be restored after rectification; the rectifier device (2) includes three groups of thyristor rectifier bridges, each group of thyristor rectifier bridges includes a coil and four thyristors; each group of thyristor rectifier bridges The anode of the first thyristor is connected to the cathode of the second thyristor, the anode of the third thyristor is connected to the cathode of the fourth thyristor, the cathode of the first thyristor is connected to the cathode of the third thyristor, so The anode of the second thyristor is connected to the anode of the fourth thyristor, one end of the coil is connected to the anode of the first thyristor, the other end is connected to the anode of the third thyristor, and three sets of thyristor rectifier bridges The direction of the induced voltage generated in the coil is the same; the anode of the second thyristor of the first group of thyristor rectifier bridge is connected to the cathode of the first thyristor of the second group of thyristor rectifier bridge, and the anode of the second group of thyristor rectifier bridge is connected. The anode of the second thyristor is connected to the cathode of the first thyristor of the third group of thyristor rectifier bridge; the cathode of the first thyristor of the first group of thyristor rectifier bridge is connected to all the cathodes of the third group of thyristor rectifier bridge. The anode of the second thyristor is connected to any two phases of the motor (3) to be restored.
  2. 根据权利要求1所述快速恢复大型电动机绝缘的装置，其特征在于，还包括电压采集装置（4）和显示器（5），所述电压采集装置（4）分别与第一组晶闸管整流桥的所述第一个晶闸管的阴极、第三组晶闸管整流桥的所述第二个晶闸管的阳极连接，采集所述整流装置的输出电压；所述电压采集装置（4）和所述显示器（5）电连接。The device for quickly restoring the insulation of large motors according to claim 1, characterized in that it also includes a voltage acquisition device (4) and a display (5), and the voltage acquisition device (4) is connected to all the components of the first group of thyristor rectifier bridges respectively. The cathode of the first thyristor and the anode of the second thyristor of the third group of thyristor rectifier bridge are connected to collect the output voltage of the rectifier device; the voltage acquisition device (4) and the display (5) are electrically connect.
  3. 根据权利要求1所述快速恢复大型电动机绝缘的装置，其特征在于，第一组晶闸管整流桥的所述第一个晶闸管的阴极或第三组晶闸管整流桥的所述第二个晶闸管的阳极与所述待恢复电动机（3）之间还设置有线圈。The device for quickly restoring the insulation of large motors according to claim 1, characterized in that the cathode of the first thyristor of the first group of thyristor rectifier bridge or the anode of the second thyristor of the third group of thyristor rectifier bridge is connected to Coils are also arranged between the motors (3) to be restored.
  4. 根据权利要求1所述快速恢复大型电动机绝缘的装置，其特征在于，第一组晶闸管整流桥的所述第一个晶闸管的阴极或第三组晶闸管整流桥的所述第二个晶闸管的阳极与所述待恢复电动机（3）之间还设置有电流表。The device for quickly restoring the insulation of large motors according to claim 1, characterized in that the cathode of the first thyristor of the first group of thyristor rectifier bridge or the anode of the second thyristor of the third group of thyristor rectifier bridge is connected to An ammeter is also provided between the motors (3) to be restored.
  5. 根据权利要求1所述快速恢复大型电动机绝缘的装置，其特征在于，第一组晶闸管整流桥的所述第一个晶闸管的阴极或第三组晶闸管整流桥的所述第二个晶闸管的阳极与所述待恢复电动机（3）之间还设置有过电流保护开关。The device for quickly restoring the insulation of large motors according to claim 1, characterized in that the cathode of the first thyristor of the first group of thyristor rectifier bridge or the anode of the second thyristor of the third group of thyristor rectifier bridge is connected to An overcurrent protection switch is also provided between the motors (3) to be restored.
  6. 根据权利要求1所述快速恢复大型电动机绝缘的装置，其特征在于，所述低压交流电源（1）为220V交流电源。The device for quickly restoring the insulation of large motors according to claim 1, characterized in that the low-voltage AC power supply (1) is a 220V AC power supply.
PCT/CN2023/090847 2022-08-11 2023-04-26 Device for rapidly recovering insulation of large motor WO2024032034A1 (en)

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CN218570107U (en) * 2022-08-11 2023-03-03 华能(福建)能源开发有限公司清洁能源分公司 Device for rapidly recovering insulation of large motor

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CN203225667U (en) * 2013-04-15 2013-10-02 保定尼尔变流器有限公司 High-power-factor low-ripple electrophoretic coating rectifying device
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