Dry-type transformer with permanent magnet safety box and wellhead choke function

Abstract

A dry-type transformer with a permanent magnet safety box and a wellhead choke function comprises a dry-type transformer box body, two cavities are formed in the dry-type transformer box body, the dry-type transformer and the permanent magnet safety box are correspondingly arranged in the two cavities respectively, and a vacuum contactor, a feed induction disconnecting link, a voltage transformer and a power-down delay relay are arranged on the permanent magnet safety box. And a pump working condition choke box is fixedly arranged at the top of the dry-type transformer box body. An opening and closing door plate is arranged on the permanent magnet safety box, a vacuum contactor and a feed induction disconnecting link are arranged in a box body of the permanent magnet safety box, and a voltage transformer and a power-down delay relay are arranged on the inner side of the door plate. The beneficial effects of the utility model are that the main loop circuit is switched on and off through the vacuum contactor, which is convenient for routine maintenance. After a frequency converter or a unit is shut down due to faults, the feed induction disconnecting link is started, a main loop can be disconnected in a delayed mode through the power-down time-delay relay, and safety risks caused by the fact that the permanent magnet submersible motor rotates reversely under the influence of falling back of a liquid column and the permanent magnet rotor rotates reversely to generate electric energy which influences other devices are avoided.

Description

Technical Field

[0001] The utility model relates to the field of electrical industry, and more specifically to a dry-type transformer with a permanent magnetic safety box and a wellhead choke function. Background Art

[0002] The permanent magnet submersible motor has a permanent magnet rotor, which does not require an electromagnetization process and saves energy. However, due to the characteristics of the submersible motor, when it stops due to a fault, the motor's liquid column will fall back, driving the guide wheel and the motor's permanent magnet rotor to rotate in the opposite direction, cutting the magnetic flux lines to generate electricity, which will pass through the cable and affect the equipment and personnel on the well, causing safety risks. There is an urgent need for a device that can provide and ensure the intrinsic safety of the wellhead when the electric pump unit stops, the liquid column falls back, and the wellhead is inductively produced.

[0003] The submersible electric pump wellhead equipment, in addition to the frequency conversion control cabinet, mainly includes transformers and pump working choke boxes. The transformer converts the high voltage of the platform into a voltage level that can meet the working conditions of the submersible electric pump. The pump working choke box supplies power to the working conditions of the electric pump in the well, plays a role in filtering and isolating AC from DC. At present, the transformers and choke boxes are placed in a messy manner, and there are serious flying wires. The land on the offshore platform is very expensive, and the existing equipment occupies too large an area. It is also necessary to place a cable bridge separately, which has a great impact on the installation and use. Utility Model Content

[0004] The utility model overcomes the shortcomings of the prior art and provides a dry-type transformer with a permanent magnetic safety box and a wellhead choke function.

[0005] The purpose of the utility model is achieved through the following technical solutions.

[0006] A dry-type transformer with a permanent magnetic safety box and a wellhead choke function comprises a dry-type transformer box body. Two cavities are arranged in the dry-type transformer box body. The dry-type transformer and the permanent magnetic safety box are respectively arranged in the two cavities. A vacuum contactor, a feeding induction knife switch, a voltage transformer and a power-off delay relay are arranged on the permanent magnetic safety box. A pump operating choke box is fixedly arranged on the top of the dry-type transformer box body.

[0007] An opening and closing door panel is provided on the permanent magnetic safety box, a vacuum contactor and a feeding induction knife switch are provided inside the permanent magnetic safety box body, a voltage transformer and a power-off delay relay are arranged on the inner side of the door panel, the vacuum contactor and the feeding induction knife switch are arranged on the main circuit of the permanent magnetic safety box, the vacuum contactor is connected in series with the feeding induction knife switch, the voltage transformer is arranged in parallel at both ends of the vacuum contactor, the voltage transformer is connected in series with the high-voltage voltmeter arranged on the door panel of the permanent magnetic safety box, and the power-off delay relay and the feeding induction knife switch are connected in linkage.

[0008] A wiring copper bar is provided at the wiring position above the vacuum contactor, and a wiring terminal is provided below the vacuum contactor. The wiring copper bar and the wiring terminal are connected to the vacuum contactor, the wiring copper bar is connected to the dry-type transformer circuit, and the pump working choke box is connected to the wiring terminal.

[0009] A high-voltage voltmeter, a first self-reset button and a second self-reset button are arranged on the door panel of the permanent magnetic safety box. The high-voltage voltmeter is matched and connected with the internal circuit, and the first self-reset button and the second self-reset button are matched and connected with the vacuum contactor.

[0010] The internal circuit of the permanent magnet safety box is powered from the incoming line position below the dry-type transformer box.

[0011] A cooling fan is provided under the dry-type transformer.

[0012] A mounting flange is provided on the top of the dry-type transformer box, and a pump operating choke box is provided on the mounting flange.

[0013] The pump-operating choke box is connected to the inner side of the dry-type transformer box through a bellows, and the internal power line of the dry-type transformer is introduced into the pump-operating choke box through the bellows.

[0014] The high-voltage circuit installed in the dry-type transformer box is the internal wiring of the equipment.

[0015] The beneficial effects of the utility model are:

[0016] This solution provides a dry-type transformer with a permanent magnetic safety box and wellhead choke function, which switches the main circuit on and off through a vacuum contactor, making it easy to perform routine maintenance. After the inverter or unit stops due to a fault, the feed induction knife switch starts, and the main circuit can be disconnected with a delay through the power-off delay relay to prevent the permanent magnetic submersible motor from rotating in the opposite direction under the influence of the falling liquid column. The permanent magnetic rotor reverses and generates electrical energy that affects other equipment, causing safety risks.

[0017] Furthermore, by placing the permanent magnet safety box in the dry-type transformer box, the dry-type transformer is equipped with the function of a permanent magnet safety box; by placing a top mounting flange above the dry-type transformer box, the pump operating choke box is fixed to the dry-type transformer box through the mounting flange, so that the three high-voltage devices of the pump operating choke box, the dry-type transformer, and the permanent magnet safety box form an overall high-voltage system, which is convenient and reliable to install. All high-voltage circuits are routed inside the equipment to avoid flying wires on site, reduce personnel safety risks, and save equipment space on site.

[0018] Furthermore, the power-off delay relay and the feed induction switch are linked, and the feed induction switch is activated after the action, which plays the role of delaying power failure, preventing the power grid from fluctuating greatly due to instantaneous power failure, which may have an adverse effect on the power grid. The pump operating choke box is powered from the terminal below the vacuum contactor, which can also ensure that the pump operating choke box is disconnected in time after the feed induction switch senses the return of the unit liquid column, avoiding the impact of the fluctuation of the wellhead high-voltage power grid on the downhole pump operating condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the internal expansion structure of the utility model;

[0020] Figure 2 It is a structural schematic diagram of the utility model;

[0021] In the figure: 1. Dry-type transformer box; 101. Permanent magnet safety box; 2. Vacuum contactor; 3. Wiring terminal; 4. Voltage transformer; 5. High-voltage voltmeter; 6. Power-off delay relay; 7. First self-reset button; 8. Second self-reset button; 9. Wiring copper busbar; 10. Dry-type transformer; 11. Cooling fan; 12. Mounting flange; 13. Pump working choke box; 1301. Bellows; 14. Feed induction knife switch. DETAILED DESCRIPTION

[0022] The technical solution of the utility model is further described below through specific embodiments.

[0023] Example

[0024] A dry-type transformer with a permanent magnetic safety box and a wellhead choke function comprises a dry-type transformer box 1. Two cavities are arranged in the dry-type transformer box 1. A dry-type transformer 10 and a permanent magnetic safety box 101 are respectively arranged in the two cavities. A vacuum contactor 2, a feeding induction switch 14, a voltage transformer 4 and a power-off delay relay 6 are arranged on the permanent magnetic safety box 101. A pump operating choke box 13 is fixedly arranged on the top of the dry-type transformer box 1.

[0025] The permanent magnetic safety box 101 is provided with an opening and closing door panel, a vacuum contactor 2 and a feeding induction knife switch 14 are provided in the box body of the permanent magnetic safety box 101, a voltage transformer 4 and a power-off delay relay 6 are arranged on the inner side of the door panel, the vacuum contactor 2 and the feeding induction knife switch 14 are arranged on the main circuit of the permanent magnetic safety box 101, the vacuum contactor 2 is connected in series with the feeding induction knife switch 14, the voltage transformer 4 is arranged in parallel at both ends of the vacuum contactor 2, the voltage transformer 4 is connected in series with the high-voltage voltmeter 5 arranged on the door panel of the permanent magnetic safety box 101, and the power-off delay relay 6 and the feeding induction knife switch 14 are connected in linkage.

[0026] A wiring copper bar 9 is provided at the wiring position above the vacuum contactor 2, and a wiring terminal 3 is provided below the vacuum contactor 2. The wiring copper bar 9 and the wiring terminal 3 are cooperatively connected to the vacuum contactor 2, the wiring copper bar 9 is connected to the circuit of the dry-type transformer 10, and the pump operating choke box 13 is connected to the wiring terminal 3.

[0027] A high-voltage voltmeter 5, a first self-reset button 7 and a second self-reset button 8 are provided on the door panel of the permanent magnetic safety box 101. The high-voltage voltmeter 5 is matched and connected with the internal circuit, and the first self-reset button 7 and the second self-reset button 8 are matched and connected with the vacuum contactor 2.

[0028] The internal circuit of the permanent magnetic safety box 101 is powered from the incoming line position below the dry-type transformer box 1.

[0029] A cooling fan 11 is provided below the dry-type transformer 10 .

[0030] A mounting flange 12 is provided on the top of the dry-type transformer box body 1, and a pump operating choke box 13 is provided on the mounting flange 12.

[0031] The pump-operating choke box 13 is connected to the inner side of the dry-type transformer box 1 through the bellows 1301 , and the internal power line of the dry-type transformer 10 is introduced into the pump-operating choke box 13 from the bellows 1301 .

[0032] The high-voltage circuit provided in the dry-type transformer box 1 is the internal wiring of the equipment.

[0033] like Figure 1-2 As shown, the working principle of this scheme is as follows.

[0034] The vacuum contactor 2 of the device draws power from the input side of the dry-type transformer 10 through the upper wiring copper bus 9, which serves as the input side of the permanent magnet safety box 101. The pump operating choke box 13 draws power from the safety isolation box 101 through the wiring terminals 3 below the vacuum contactor 2. As the input side of the pump operating choke box 13, the pump operating choke box 13 obtains power from the wiring terminals 3 below the vacuum contactor 2, which can ensure that after the feeding induction knife switch 14 senses the liquid column of the unit and disconnects, the pump operating choke box is disconnected in time to avoid the impact of the fluctuation of the wellhead high-voltage power grid on the downhole pump condition.

[0035] The device distributes input power from the inside by ensuring that the vacuum contactor 2, dry-type transformer 10 and pump-operated choke box 13 are connected internally. There is no redundant wiring outside the whole device, which reduces the difficulty of on-site high-voltage wiring and avoids flying high-voltage wires outside the on-site equipment.

[0036] The permanent magnetic safety box 101 is provided with a vacuum contactor 2 and a feeding induction knife switch 14 on the main circuit of the permanent magnetic safety box 101, and the vacuum contactor 2 and the feeding induction knife switch 14 are connected in series. When the main circuit needs to be manually switched on and off, the vacuum contactor 2 is operated to complete the circuit breaking operation. At the same time, when the feeding induction knife switch 14 receives the feeding signal from the downhole unit, the feeding induction knife switch 14 is automatically disconnected to achieve safety protection for the wellhead personnel. Among them, the first self-reset button 7 and the second self-reset button 8 are used to control the vacuum contactor 2 to be attracted and disconnected.

[0037] The voltage transformer 4 is arranged in parallel at both ends of the vacuum contactor 2, and the voltage transformer 4 is connected in series with the high-voltage voltmeter 5 to monitor the voltage of the main circuit in real time and intervene in time when the voltage is abnormal. At the same time, the high-voltage voltmeter 5 can also be used to determine whether the safety box has started the protective circuit breaker function.

[0038] The power-off delay relay 6 and the feeding induction switch 14 are linked together. The feeding induction switch 14 is activated after the action, which plays the function of delaying power failure to prevent the power grid from being greatly impacted and fluctuated due to instantaneous power failure, thereby causing adverse effects on the power grid.

[0039] The following are the main functions and specific operations of the utility model.

[0040] The main circuit on-off function is used during maintenance. The main circuit is on and off through the vacuum contactor 2 to perform routine maintenance, so as to avoid the permanent magnet motor's reverse rotation under liquid column pressure or other conditions to generate electrical energy that affects the personnel and equipment on the well.

[0041] The anti-feedback function is automatically delayed shut down after a unit fault. When the inverter or unit stops due to a fault, the feed induction switch 14 is started, and the main circuit is automatically delayed disconnected through the power-off delay relay 6 to prevent the permanent magnet submersible motor from causing the impeller to rotate in the opposite direction under the influence of the falling liquid column, driving the permanent magnet rotor to reverse, causing the permanent magnet rotor to reverse and generate electrical energy that affects other equipment and causes safety risks.

[0042] The dry-type transformer is provided with a permanent magnetic safety box function. By arranging the permanent magnetic safety box 101 in the dry-type transformer box body 1, the dry-type transformer is provided with a permanent magnetic safety box function.

[0043] The pump-operating choke box-dry-type transformer-permanent-magnet safety box high-voltage system is configured by placing a top mounting flange above the dry-type transformer box body 1, and fixing the pump-operating choke box 13 to the dry-type transformer box body 1 through the mounting flange 12, so that the three high-voltage devices of the pump-operating choke box 13, the dry-type transformer 10 and the permanent-magnet safety box 101 form an integral high-voltage system, making the installation convenient and reliable.

[0044] On-site high-voltage wiring and platform space saving, a mounting flange 12 is arranged above the dry-type transformer 10, a pump-operating choke box 13 is fixedly arranged above the mounting flange 12, and the pump-operating choke box 13 leads the power line from the inside of the dry-type transformer 10 through the bellows 1301; a wiring terminal 3 is arranged below the vacuum contactor 2, a voltage transformer 4 and a power-off delay relay 6 are arranged inside the permanent magnetic safety box 101, and the wiring is arranged inside the permanent magnetic safety box 101, and the power is obtained from the incoming line position below the dry-type transformer box 1; all high-voltage circuits are routed inside the equipment, avoiding on-site flying wires, reducing personnel safety risks, and saving on-site equipment space.

[0045] The above is a detailed description of the embodiments of the utility model, but the contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A dry-type transformer with a permanent magnetic safety box and a wellhead choke function, characterized in that: It includes a dry-type transformer box, which has two cavities. The dry-type transformer and the permanent magnetic safety box are respectively arranged in the two cavities. The permanent magnetic safety box is provided with a vacuum contactor, a feeding induction switch, a voltage transformer and a power-off delay relay. A pump operating choke box is fixedly provided on the top of the dry-type transformer box.

2. A dry-type transformer with a permanent magnetic safety box and a wellhead choke function according to claim 1, characterized in that: An opening and closing door panel is provided on the permanent magnetic safety box, a vacuum contactor and a feeding induction knife switch are provided inside the permanent magnetic safety box body, a voltage transformer and a power-off delay relay are arranged on the inner side of the door panel, the vacuum contactor and the feeding induction knife switch are arranged on the main circuit of the permanent magnetic safety box, the vacuum contactor is connected in series with the feeding induction knife switch, the voltage transformer is arranged in parallel at both ends of the vacuum contactor, the voltage transformer is connected in series with the high-voltage voltmeter arranged on the door panel of the permanent magnetic safety box, and the power-off delay relay and the feeding induction knife switch are connected in linkage.

3. A dry-type transformer with a permanent magnetic safety box and a wellhead choke function according to claim 2, characterized in that: A wiring copper bar is provided at the wiring position above the vacuum contactor, and a wiring terminal is provided below the vacuum contactor. The wiring copper bar and the wiring terminal are connected to the vacuum contactor, the wiring copper bar is connected to the dry-type transformer circuit, and the pump working choke box is connected to the wiring terminal.

4. A dry-type transformer with a permanent magnetic safety box and a wellhead choke function according to claim 2, characterized in that: A high-voltage voltmeter, a first self-reset button and a second self-reset button are arranged on the door panel of the permanent magnetic safety box. The high-voltage voltmeter is matched and connected with the internal circuit, and the first self-reset button and the second self-reset button are matched and connected with the vacuum contactor.

5. A dry-type transformer with a permanent magnetic safety box and a wellhead choke function according to claim 1, characterized in that: The internal circuit of the permanent magnet safety box is powered from the incoming line position below the dry-type transformer box.

6. A dry-type transformer with a permanent magnetic safety box and a wellhead choke function according to claim 1, characterized in that: A cooling fan is provided under the dry-type transformer.

7. A dry-type transformer with a permanent magnetic safety box and a wellhead choke function according to claim 1, characterized in that: A mounting flange is provided on the top of the dry-type transformer box, and a pump operating choke box is provided on the mounting flange.

8. The dry-type transformer with a permanent magnetic safety box and a wellhead choke function according to claim 1, characterized in that: The pump-operating choke box is connected to the inner side of the dry-type transformer box through a bellows, and the internal power line of the dry-type transformer is introduced into the pump-operating choke box through the bellows.

9. A dry-type transformer with a permanent magnetic safety box and a wellhead choke function according to claim 1, characterized in that: The high-voltage circuit installed in the dry-type transformer box is the internal wiring of the equipment.

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