A transformer direct-current blocking device based on zinc oxide uniform energy technology

Abstract

The application relates to the technical field of transformer protection equipment, and particularly discloses a transformer direct-current isolation device based on zinc oxide equal-energy technology, which comprises a direct-current isolation capacitor, a voltage limiter and a high-speed bypass switch, and the voltage limiter comprises a box body and a resistance value monitoring and replacing module. In the application, the direct-current biasing current of the transformer during work is isolated through cooperation of the direct-current isolation capacitor, the voltage limiter and the high-speed bypass switch, so that the problems of increased noise, distorted system voltage, increased transformer loss and increased transformer temperature of the transformer caused by the influence of direct-current biasing are avoided, the protectiveness of the transformer is improved, the full-line equal-energy method is adopted to limit overvoltage in the transformer by using multiple high-energy zinc oxide valve plates, so that the capacitor can adopt a low-voltage capacitor, the cost is low, the enterprise's cost can be effectively reduced, the cost of the equipment is greatly reduced, and certain pressure on the enterprise equipment expenditure is relieved.

Description

Technical Field

[0001] This invention relates to the field of transformer protection equipment technology, and in particular to a transformer DC blocking device based on zinc oxide equalization technology. Background Technology

[0002] A transformer is a device that uses the principle of electromagnetic induction to change alternating current voltage. Its main components are the primary coil, the secondary coil, and the iron core (magnetic core). The main functions of a transformer include voltage transformation, current transformation, impedance transformation, isolation, and voltage stabilization (magnetic saturation transformer). According to its use, it can be divided into power transformers and special transformers.

[0003] DC bias is an abnormal operating state of a transformer, referring to the presence of a DC component in the transformer's excitation current. As the DC bias current increases, the excitation current waveform becomes distorted, primarily due to asymmetry between the positive and negative half-cycles. DC bias can cause a series of problems for the transformer, including increased noise, system voltage distortion, increased transformer losses, and elevated transformer temperature. Therefore, to address these issues, we propose a transformer DC blocking device based on zinc oxide equalization technology. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a transformer DC blocking device based on zinc oxide equalization technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A transformer DC blocking device based on zinc oxide equalization technology includes a DC blocking capacitor, a voltage limiting protector and a high-speed bypass switch. The voltage limiting protector includes a housing and a resistance value monitoring and replacement module. The housing is provided with several sets of mutually cooperating mounting plates. Each set of mounting plates is connected by several high-energy zinc oxide valve plates through the full-line equalization method.

[0007] The resistance value monitoring and replacement module includes a fault determination unit and a rapid replacement unit. The fault determination unit is used to determine whether each high-energy zinc oxide valve is faulty using preset determination rules. If the determination result is yes, the identifier corresponding to the high-energy zinc oxide valve is sent to the rapid replacement unit.

[0008] Upon receiving the identifier corresponding to the high-energy zinc oxide valve plate, the rapid replacement unit replaces the high-energy zinc oxide valve plate corresponding to that identifier.

[0009] Preferably, the preset judgment rule of the fault judgment unit is as follows:

[0010] Using the formula:

[0011] X k Let be the standard reference resistance value for the k-th high-energy zinc oxide valve plate, and γ be a correction factor, where 1.1 ≤ γ ≤ 1.3, D k The actual resistance value of the k-th high-energy zinc oxide valve disc is given, and T is the standard resistance value of the high-energy zinc oxide valve disc.

[0012] When D k <X k If this occurs, then the high-energy zinc oxide valve plate is faulty.

[0013] Preferably, the fault determination unit includes resistance sensors installed on several high-energy zinc oxide valve plates. The resistance sensors are electrically connected to signal amplifiers, which are electrically connected to a microprocessor. The microprocessor is used to output the resistance value corresponding to each high-energy zinc oxide valve plate. The rapid replacement unit also includes a controller switch electrically connected to the microprocessor. The controller switch is electrically connected to a second electromagnet. The second electromagnet is provided with a signal receiving end, and the controller switch is provided with a signal transmitting end that cooperates with the signal receiving end.

[0014] Preferably, each set of mounting plates has a sliding groove on its opposite side, and a high-energy zinc oxide valve plate terminal is installed in each of the two sliding grooves. The two ends of the high-energy zinc oxide valve plate are slidably installed in the two sliding grooves respectively, and the two ends of the high-energy zinc oxide valve plate are electrically connected to the two high-energy zinc oxide valve plate terminals respectively. The second electromagnet is installed between the two mounting plates.

[0015] Preferably, the outer wall of the high-energy zinc oxide valve plate is fixedly fitted with a magnetic attracting plate that repels the magnetic pole of the second electromagnet, and a quick connection module is provided on the side of the second electromagnet away from the high-energy zinc oxide valve plate.

[0016] Preferably, the quick connection module includes a spring fixed to the side of the second electromagnet away from the high-energy zinc oxide valve plate. The end of the spring extends to the outside of the two mounting plates and is connected to a first electromagnet that cooperates with the second electromagnet. Rubber blocks are fixed at both the upper and lower ends of the first electromagnet. Connection terminals that cooperate with the terminals of the two high-energy zinc oxide valve plates are installed on the opposite sides of the two rubber blocks. An adjustable resistor that cooperates with the two connection terminals is provided on the top wall of the housing. Fixing blocks are fixed on the opposite sides of the two mounting plates. Water-absorbing and expanding rubber blocks are fixed on the opposite sides of the two fixing blocks. A moisture-absorbing cloth cover is wrapped around the outer wall of the water-absorbing and expanding rubber block, and the moisture-absorbing cloth cover is in contact with the outer wall of the high-energy zinc oxide valve plate.

[0017] Preferably, a fixed plate is installed on the top wall of the box, and an adjustable resistor is installed at the bottom of the fixed plate. The two ends of the adjustable resistor are electrically connected to two connecting terminals respectively through connecting wires. A spring groove and a sleeve groove are opened on the side of the second electromagnet away from the high-energy zinc oxide valve plate. The end of the spring is installed in the spring groove, and a sleeve is installed in the sleeve groove. A guide rod is slidably installed in the sleeve, and the end of the guide rod is fixed to the side of the first electromagnet.

[0018] Preferably, a heat dissipation copper column is installed on the top wall of the box, and several heat dissipation holes are opened on the heat dissipation copper column. The heat dissipation copper column is connected to a high-energy zinc oxide valve plate through a heat-conducting copper wire.

[0019] Preferably, the top of the housing has an air inlet and outlet, a filter screen is installed inside the air inlet and outlet, and a fan is installed on the bottom wall of the housing, with the fan located directly below the air inlet and outlet.

[0020] Preferably, a collection box is placed on the bottom wall of the box, a collection port that matches the collection box is opened on the side of the box, a sealing plate is hinged to the outer wall of the box to cover the collection port, and a bottom plate is fixed to the bottom of the box with fixing holes.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. This invention uses a combination of DC blocking capacitors, voltage limiting protectors, and high-speed bypass switches to isolate the DC bias magnetism of the transformer during operation. This prevents the transformer from being affected by DC bias magnetism, which can lead to increased noise, system voltage distortion, increased transformer losses, and increased transformer temperature, thus improving the protection of the transformer. At the same time, the full-line energy equalization method uses multiple high-energy zinc oxide valve plates to limit overvoltage in the transformer, allowing the use of low-voltage capacitors, which are inexpensive and can effectively reduce the company's operating costs, significantly reducing equipment costs and alleviating some of the pressure on the company's equipment expenditure.

[0023] 2. In this invention, a resistance sensor can monitor the resistance value of several high-energy zinc oxide valve plates in real time. This prevents damage to a single high-energy zinc oxide valve plate from affecting the uniformity of the valve plates and thus ensuring adequate overvoltage limiting in the transformer, which would otherwise disrupt its normal operation. Furthermore, the resistance monitoring and replacement module allows for real-time monitoring of the resistance value of the high-energy zinc oxide valve plates. If a single valve plate fails, a second electromagnet can be immediately activated, utilizing the shared pole of the second electromagnet and the magnetic attractor. The principle of repulsion disconnects the magnetic attractor and the damaged high-energy zinc oxide valve plate from the high-energy zinc oxide valve plate terminals under the action of mutual repulsion. With the cooperation of the second electromagnet and the first electromagnet, the first electromagnet is attracted towards the second electromagnet, thereby causing the first electromagnet to drive the two connecting terminals to electrically connect with the two high-energy zinc oxide valve plate terminals in the slide groove. The resistance value is adjusted to the normal resistance range of the damaged high-energy zinc oxide valve plate by using an adjustable resistor for replacement. This can ensure the normal overvoltage limiting function of the voltage limiting protector for the transformer and ensure the normal operation of the transformer.

[0024] 3. In this invention, the use of water-absorbing and expanding rubber blocks and moisture-absorbing cloth sleeves on both sides of the high-energy zinc oxide valve plate allows for the absorption of moisture inside the enclosure, ensuring that all components installed inside the enclosure are in a dry environment and guaranteeing the normal operation of the high-energy zinc oxide valve plate and other components. Simultaneously, the water-absorbing and expanding properties of the rubber blocks allow for clamping and fixing of the high-energy zinc oxide valve plate between the two rubber blocks and the moisture-absorbing cloth sleeves, preventing it from shifting due to vibration during operation and disconnecting from the valve plate terminals, thus ensuring the stability of the high-energy zinc oxide valve plate during operation. Furthermore, the use of the water-absorbing and expanding rubber blocks and moisture-absorbing cloth sleeves also helps to maintain the high-energy zinc oxide valve plate between the rubber blocks and the cloth sleeves. The extrusion action of the zinc oxide valve plate ensures the verticality of the high-energy zinc oxide valve plate, guaranteeing that it always operates vertically and conforms to the normal installation process. Furthermore, the heat-dissipating copper pillars absorb the high temperature generated by the high-energy zinc oxide valve plate during operation, causing thermal expansion and providing a downward force to the upper mounting plate. This forces the mounting plate to press down on the high-energy zinc oxide valve plate and other mounting plates, ensuring tight contact between the two ends and terminals of the high-energy zinc oxide valve plate. This prevents loose connections and short circuits. The heat-dissipating copper pillars also dissipate heat from the high-energy zinc oxide valve plate, ensuring its long-term stable operation. Attached Figure Description

[0025] Figure 1 This is a circuit diagram of a transformer DC blocking device based on zinc oxide equalization technology proposed in this invention;

[0026] Figure 2This is a schematic diagram of the module flow of a resistance value monitoring and replacement system for a transformer DC blocking device based on zinc oxide equalization technology proposed in this invention.

[0027] Figure 3 This is an isometric view of a voltage limiting protector for a transformer DC blocking device based on zinc oxide equalization technology proposed in this invention;

[0028] Figure 4 This is a cross-sectional view of a voltage limiting protector for a transformer DC blocking device based on zinc oxide equalization technology proposed in this invention;

[0029] Figure 5 This is a cross-sectional view of a voltage limiting protector for a transformer DC blocking device based on zinc oxide equalization technology proposed in this invention;

[0030] Figure 6 This is a schematic diagram of the mounting plate of a voltage limiting protector for a transformer DC blocking device based on zinc oxide equalization technology proposed in this invention;

[0031] Figure 7 This is a cross-sectional view of the mounting plate of a voltage limiting protector for a transformer DC blocking device based on zinc oxide equalization technology proposed in this invention;

[0032] Figure 8 This is a schematic diagram showing the connection between the high-energy zinc oxide valve plate and the mounting plate of a voltage limiting protector for a transformer DC blocking device based on zinc oxide equalization technology, as proposed in this invention.

[0033] Figure 9 This is a schematic diagram of the structure of the second electromagnet of a voltage limiting protector for a transformer DC blocking device based on zinc oxide equalization technology proposed in this invention;

[0034] Figure 10 This is a front view of a voltage limiting protector for a transformer DC blocking device based on zinc oxide equalization technology proposed in this invention.

[0035] In the diagram: 1. Base plate; 2. Box body; 3. Sealing plate; 4. Inlet and outlet vents; 5. Collection box; 6. Mounting plate; 7. First electromagnet; 8. Fan; 9. Fixing plate; 10. Adjustable resistor; 11. Heat dissipation copper column; 12. Heat dissipation hole; 13. Second electromagnet; 14. Rubber block; 15. Connecting terminal; 16. Slide groove; 17. High-energy zinc oxide valve plate; 18. Fixing block; 19. Water-absorbing and expanding rubber block; 20. Moisture-absorbing cloth cover; 21. Magnetic suction plate; 22. Sleeve; 23. Spring; 24. High-energy zinc oxide valve plate terminal; 25. Spring groove; 26. Sleeve groove; zd1: First knife switch; zd2: Second knife switch; T: Transformer; c: DC blocking capacitor; FR: Voltage limiting protector; K: High-speed bypass switch. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] To make the plan clear, the following is... Figure 1 The connection relationships contained herein are explained as follows: In the figure, K represents a high-speed bypass switch, FR represents a voltage limiting protector, c represents a DC blocking capacitor, zd1 represents the first switch, zd2 represents the second switch, and T represents a transformer. Among them, c is connected in parallel with FR through a wire, and T is connected in parallel with c through a wire. zd1 and zd2 are set between T and c. One end of zd1 is electrically connected to zd2, and the other end of zd1 is electrically connected to c. One end of zd2 is electrically connected to T, and the other end of zd2 is electrically connected to c.

[0038] Reference Figure 1-10 A transformer DC blocking device based on zinc oxide equalization technology includes a DC blocking capacitor c, a voltage limiting protector FR and a high-speed bypass switch K. The voltage limiting protector FR includes a housing 2 and a resistance value monitoring and replacement module. The housing 2 is equipped with several sets of mutually cooperating mounting plates 6. Several high-energy zinc oxide valve plates 17 are installed between each set of mounting plates 6 through the full-line equalization method.

[0039] The resistance value monitoring and replacement module includes a fault determination unit and a rapid replacement unit. The fault determination unit is used to determine whether each high-energy zinc oxide valve 17 is faulty using preset determination rules. If the determination result is yes, the identifier corresponding to the high-energy zinc oxide valve 17 is sent to the rapid replacement unit.

[0040] After receiving the identifier corresponding to the high-energy zinc oxide valve plate 17, the rapid replacement unit replaces the high-energy zinc oxide valve plate 17 corresponding to the identifier.

[0041] As a technical optimization of the present invention, the preset judgment rules of the fault judgment unit are as follows:

[0042] Using the formula:

[0043] X k Let be the standard reference resistance of the k-th high-energy zinc oxide valve plate 17, and γ be a correction factor, where 1.1 ≤ γ ≤ 1.3, D k The actual resistance value of the k-th high-energy zinc oxide valve plate 17 is T, and the standard resistance value of the high-energy zinc oxide valve plate 17 is T.

[0044] When D k <X k If this occurs, then the high-energy zinc oxide valve plate 17 is faulty.

[0045] As a technical optimization of the present invention, the fault determination unit includes a resistance sensor installed on a plurality of high-energy zinc oxide valve plates 17. The resistance sensor is electrically connected to a signal amplifier, and the signal amplifier is electrically connected to a microprocessor. The microprocessor is used to output the resistance value corresponding to each high-energy zinc oxide valve plate 17. The rapid replacement unit also includes a controller switch electrically connected to the microprocessor. The controller switch is electrically connected to a second electromagnet 13. The second electromagnet 13 is provided with a signal receiving end, and the controller switch is provided with a signal transmitting end that cooperates with the signal receiving end.

[0046] As a technical optimization of the present invention, each set of mounting plates 6 has a sliding groove 16 on its opposite side. High-energy zinc oxide valve plate terminals 24 are installed in both sliding grooves 16. The two ends of the high-energy zinc oxide valve plate 17 are slidably installed in the two sliding grooves 16 respectively. The two ends of the high-energy zinc oxide valve plate 17 are electrically connected to the two high-energy zinc oxide valve plate terminals 24 respectively. The second electromagnet 13 is installed between the two mounting plates 6. Through the cooperative use of the sliding grooves 16, the high-energy zinc oxide valve plate terminals 24 and the high-energy zinc oxide valve plate 17, it is easy to disconnect the high-energy zinc oxide valve plate 17 from the high-energy zinc oxide valve plate terminals 24 and replace the adjustable resistor 10 to replace the high-energy zinc oxide valve plate 17 to maintain uniform energy.

[0047] As a technical optimization of the present invention, a magnetic suction plate 21 that is mutually repulsive to the magnetic pole of the second electromagnet 13 is fixedly sleeved on the outer wall of the high-energy zinc oxide valve plate 17. A quick connection module is provided on the side of the second electromagnet 13 away from the high-energy zinc oxide valve plate 17. Through the cooperation of the second electromagnet 13 and the magnetic suction plate 21, the high-energy zinc oxide valve plate 17 can be quickly disconnected from the high-energy zinc oxide valve plate terminal 24 by using the second electromagnet 13.

[0048] As a technical optimization of the present invention, the quick connection module includes a spring 23 fixed to the side of the second electromagnet 13 away from the high-energy zinc oxide valve plate 17. The end of the spring 23 extends to the outside of the two mounting plates 6 and is connected to a first electromagnet 7 that cooperates with the second electromagnet 13. Rubber blocks 14 are fixed at both the upper and lower ends of the first electromagnet 7. Connection terminals 15 that cooperate with the terminals 24 of the two high-energy zinc oxide valve plates are installed on the opposite sides of the two rubber blocks 14. An adjustable resistor 10 that cooperates with the two connection terminals 15 is provided on the top wall of the housing 2. Fixing blocks 18 are fixed to the opposite sides of the two mounting plates 6. Water-absorbing and expanding rubber blocks 19 are fixed to the opposite sides of the two fixing blocks 18. Moisture-absorbing cloth sleeves 20 are wrapped around the outer walls of the water-absorbing and expanding rubber blocks 19. The moisture-absorbing cloth sleeves 20 are in contact with the outer walls of the high-energy zinc oxide valve plate 17. The verticality of the high-energy zinc oxide valve plate 17 is ensured by the squeezing action of the water-absorbing and expanding rubber blocks 19 and the moisture-absorbing cloth sleeves 20 on the high-energy zinc oxide valve plate 17 between them. This ensures that the high-energy zinc oxide valve plate 17 is always in a vertical working state, which is in line with the normal installation process of the high-energy zinc oxide valve plate 17.

[0049] As a technical optimization of the present invention, a fixing plate 9 is installed on the top wall of the inner box 2, and an adjustable resistor 10 is installed at the bottom of the fixing plate 9. The two ends of the adjustable resistor 10 are electrically connected to two connecting terminals 15 respectively through connecting wires. A spring groove 25 and a sleeve groove 26 are opened on the side of the second electromagnet 13 away from the high-energy zinc oxide valve plate 17. The end of the spring 23 is installed in the spring groove 25, and a sleeve 22 is installed in the sleeve groove 26. A guide rod is slidably installed in the sleeve 22, and the end of the guide rod is fixed to the side of the first electromagnet 7.

[0050] As a technical optimization of the present invention, a heat dissipation copper column 11 is installed on the top wall of the inner wall of the housing 2. The heat dissipation copper column 11 has several heat dissipation holes 12. The heat dissipation copper column 11 is connected to the high-energy zinc oxide valve plate 17 through a heat-conducting copper wire. The heat dissipation copper column 11 absorbs the high temperature generated by the high-energy zinc oxide valve plate 17 during operation and causes itself to undergo a certain thermal expansion. This provides a downward force to the mounting plate 6 located on the upper layer, so that the mounting plate 6 successively presses the high-energy zinc oxide valve plate 17 and other mounting plates 6 downwards. This ensures that the two ends of the high-energy zinc oxide valve plate 17 and the high-energy zinc oxide valve plate terminal 24 are in close contact, avoiding the short circuit caused by loose connection. The heat dissipation copper column 11 can also dissipate heat from the high-energy zinc oxide valve plate 17, ensuring the long-term stable working characteristics of the high-energy zinc oxide valve plate 17.

[0051] As a technical optimization of the present invention, an air inlet / outlet 4 is provided on the top of the housing 2, and a filter screen is installed inside the air inlet / outlet 4. A fan 8 is installed on the bottom wall of the housing 2, and the fan 8 is located directly below the air inlet / outlet 4. By using the fan 8 and the air inlet / outlet 4 together, the heat emitted by the heat dissipation copper column 11 can be blown into the housing 2 to dry the internal components of the housing 2, ensuring the dryness of the housing 2. At the same time, the fan 8 can be reversed to exhaust the air in the housing 2 to ventilate the housing 2. Ventilation can be carried out to cool down the housing 2 when the air temperature inside the housing 2 is too high.

[0052] As a technical optimization of the present invention, a collection box 5 is placed on the bottom wall of the inner box 2, and a collection port that cooperates with the collection box 5 is opened on the side of the box 2. A sealing plate 3 is hinged to the outer wall of the box 2, and the sealing plate 3 covers the collection port. A bottom plate 1 is fixed to the bottom of the box 2, and a fixing hole is opened on the bottom plate 1. By using the collection box 5 and the collection port together, it is easy to take out the high-energy zinc oxide valve plate 17 that has fallen into the collection box 5, and it is easy to collect the high-energy zinc oxide valve plate 17.

[0053] In use, when there is no DC bias in the transformer T (or the DC bias is less than a set value), the high-speed bypass switch K is normally closed, and the transformer T is grounded through the high-speed bypass switch K. When there is DC bias in the transformer (or greater than a set value), the high-speed bypass switch K opens, connecting the DC blocking capacitor C in series to the grounding circuit to suppress DC. When the DC bias in the transformer disappears, i.e., the voltage on the DC blocking capacitor C drops below the set value, the high-speed bypass switch K closes, short-circuiting the DC blocking capacitor C and deactivating its DC blocking function. When a single-phase ground fault occurs, the inrush current flows through the DC blocking capacitor C, causing the voltage on the DC blocking capacitor C to rise rapidly, triggering the voltage limiting protector FR to conduct and limiting the voltage across the DC blocking capacitor C, thus protecting the DC blocking capacitor C. When the short-circuit current changes to the first zero-crossing point, the high-speed bypass switch K closes in phase control, diverting the short-circuit current to the switch, thus protecting the high-energy zinc oxide valve plate 17.

[0054] By using the full-line energy equalization method, several high-energy zinc oxide valve plates 17 are installed between opposing mounting plates 6. Through the combined use of DC blocking capacitor c, voltage limiting protector FR, and high-speed bypass switch K, the DC bias magnetism of transformer T during operation is extracted, avoiding problems such as increased noise, system voltage distortion, increased transformer T losses, and increased transformer T temperature caused by the DC bias magnetism, thus improving the protection of transformer T. At the same time, by using the full-line energy equalization method to limit overvoltage in transformer T using multiple high-energy zinc oxide valve plates 17, transformer T can be made into a low-voltage transformer. The low-voltage transformer is inexpensive, which can effectively reduce the enterprise's operating costs and greatly reduce the cost of transformer sets, thus easing the pressure on the enterprise's equipment expenditure.

[0055] The resistance sensor can monitor the resistance value of several high-energy zinc oxide valve plates 17 in real time, preventing damage to a single high-energy zinc oxide valve plate 17 from affecting the uniformity of the valve plates and thus ensuring adequate overvoltage limiting in the transformer and affecting its normal operation. Furthermore, the resistance value replacement module can monitor the resistance value of the high-energy zinc oxide valve plates 17 in real time. When a single high-energy zinc oxide valve plate 17 fails, the second electromagnet 13 can be immediately activated. Utilizing the principle of repulsion between the like poles of the second electromagnet 13 and the magnetic attractor 21, the magnetic attractor 21 and the damaged high-energy zinc oxide valve plate 17 are disconnected from the high-energy zinc oxide valve plate terminal 24 under the action of mutual repulsion. With the cooperation of the second electromagnet 13 and the first electromagnet 7, the valve plate 17 is then... The first electromagnet 7 is attracted to the second electromagnet, thereby causing the first electromagnet 7 to drive the two connecting terminals 15 to electrically connect with the two high-energy zinc oxide valve plate terminals 24 in the slide groove 16. The resistance value is adjusted to the normal resistance value range of the damaged high-energy zinc oxide valve plate 17 using the adjustable resistor 10 for replacement. This ensures that the voltage limiting protector can effectively limit the overvoltage of the transformer and ensure the normal operation of the transformer. Through the resistance value monitoring and replacement system, the working status of several high-energy zinc oxide valve plates 17 in the housing 2 can be monitored in real time and replaced quickly. The fault information can also be sent to the user's mobile phone and computer in real time, which is convenient for maintenance personnel to quickly understand the fault of the voltage limiting protector and make early response decisions to ensure the protection of the transformer.

[0056] Meanwhile, the use of water-absorbing and expanding rubber blocks 19 and moisture-absorbing cloth sleeves 20 on both sides of the high-energy zinc oxide valve plate 17 allows for the absorption of moisture inside the housing 2, ensuring that all components installed inside the housing 2 are in a dry environment and guaranteeing the normal operation of the high-energy zinc oxide valve plate 17 and other components. Furthermore, the water-absorbing and expanding properties of the rubber blocks 19 allow for clamping and fixing of the high-energy zinc oxide valve plate 17 between the two rubber blocks 19 and the moisture-absorbing cloth sleeves 20, preventing it from shifting due to vibration during operation and disconnecting from the high-energy zinc oxide valve plate terminal 24, thus ensuring the stability of the high-energy zinc oxide valve plate 17 during operation. Additionally, the squeezing action of the rubber blocks 19 and the moisture-absorbing cloth sleeves 20 on the high-energy zinc oxide valve plate 17 ensures its verticality, guaranteeing that the high-energy zinc oxide valve plate 17 is always in a vertical working state, conforming to the normal installation process of the high-energy zinc oxide valve plate 17.

[0057] Simultaneously, the combined use of the heat dissipation copper pillar 11 and the heat-conducting copper wire allows the heat dissipation copper pillar 11 to absorb the high temperature generated by the high-energy zinc oxide valve plate 17 during operation, causing it to undergo a certain degree of thermal expansion. This provides a downward force to the upper mounting plate 6, causing the mounting plate 6 to successively press down on the high-energy zinc oxide valve plate 17 and other mounting plates 6. This ensures tight contact between the two ends of the high-energy zinc oxide valve plate 17 and the high-energy zinc oxide valve plate terminals 24, preventing loose connections and short circuits. Furthermore, the heat dissipation copper pillar 11 can dissipate heat from the high-energy zinc oxide valve plate 17. This ensures the long-term stable operation of the high-energy zinc oxide valve plate 17; at the same time, the heat dissipation copper column 11 absorbs heat and discharges it through the heat dissipation holes 12 on its surface. When the air inside the box 2 is too humid, the fan 8 can be turned on to blow the heat emitted by the heat dissipation copper column 11 into the box 2 to dry the internal components of the box 2, ensuring the dryness of the box 2. When it is necessary to ventilate and cool down the box 2, the fan 8 can be reversed to discharge the air inside the box 2 to ventilate the box 2. Ventilation can be carried out to cool down the box 2 when the air temperature inside the box 2 is too high.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A transformer DC blocking device based on zinc oxide equalization technology, comprising a DC blocking capacitor, a voltage limiting protector, and a high-speed bypass switch, characterized in that, The voltage limiting protector includes a housing (2) and a resistance value monitoring and replacement module. The housing (2) is provided with several sets of mutually cooperating mounting plates (6). Each set of mounting plates (6) is equipped with several high-energy zinc oxide valve plates (17) through the full-line equalization method. The resistance value monitoring and replacement module includes a fault determination unit and a rapid replacement unit. The fault determination unit is used to determine whether each high-energy zinc oxide valve (17) is faulty by using preset determination rules. If the determination result is yes, the identifier corresponding to the high-energy zinc oxide valve (17) is sent to the rapid replacement unit. After receiving the identifier corresponding to the high-energy zinc oxide valve piece (17), the rapid replacement unit replaces the high-energy zinc oxide valve piece (17) corresponding to the identifier. The fault determination unit includes a resistance sensor installed on several high-energy zinc oxide valve plates (17). The resistance sensor is electrically connected to a signal amplifier, and the signal amplifier is electrically connected to a microprocessor. The microprocessor is used to output the resistance value corresponding to each high-energy zinc oxide valve plate (17). The fast replacement unit also includes a controller switch electrically connected to the microprocessor. The controller switch is electrically connected to a second electromagnet (13). The second electromagnet (13) is provided with a signal receiving end, and the controller switch is provided with a signal transmitting end that cooperates with the signal receiving end. Each set of mounting plates (6) has a sliding groove (16) on its opposite side. High-energy zinc oxide valve plate terminals (24) are installed in both sliding grooves (16). The two ends of the high-energy zinc oxide valve plate (17) are slidably installed in the two sliding grooves (16). The two ends of the high-energy zinc oxide valve plate (17) are electrically connected to the two high-energy zinc oxide valve plate terminals (24). The second electromagnet (13) is installed between the two mounting plates (6). The outer wall of the high-energy zinc oxide valve plate (17) is fixedly fitted with a magnetic suction plate (21) that is mutually repulsive to the magnetic pole of the second electromagnet (13). A quick connection module is provided on the side of the second electromagnet (13) away from the high-energy zinc oxide valve plate (17). The quick connection module includes a spring (23) fixed to the side of the second electromagnet (13) away from the high-energy zinc oxide valve plate (17). The end of the spring (23) extends to the outside of the two mounting plates (6) and is connected to a first electromagnet (7) that cooperates with the second electromagnet (13). Rubber blocks (14) are fixed at both the upper and lower ends of the first electromagnet (7). Connection terminals (15) that cooperate with the two high-energy zinc oxide valve plate terminals (24) are installed on the opposite sides of the two rubber blocks (14). An adjustable resistor (10) that cooperates with the two connection terminals (15) is provided on the inner top wall of the housing (2).

2. The transformer DC blocking device based on zinc oxide equalization technology according to claim 1, characterized in that, The fault determination unit performs the determination using preset determination rules as follows: Using the formula: ; The standard reference resistance value is for the k-th high-energy zinc oxide valve plate (17). As a correction factor, 1.1 ≤ ≤1.3, The actual resistance value of the kth high-energy zinc oxide valve plate (17) monitored, where T is the standard resistance value of the high-energy zinc oxide valve plate (17); when If so, the high-energy zinc oxide valve plate (17) is faulty.

3. The transformer DC blocking device based on zinc oxide equalization technology according to claim 2, characterized in that, The two mounting plates (6) are fixed with fixing blocks (18) on opposite sides, and water-absorbing and expanding rubber blocks (19) are fixed with opposite sides of the two fixing blocks (18). The outer wall of the water-absorbing and expanding rubber blocks (19) is wrapped with a moisture-absorbing cloth sleeve (20), and the moisture-absorbing cloth sleeve (20) is in contact with the outer wall of the high-energy zinc oxide valve plate (17).

4. A transformer DC blocking device based on zinc oxide equalization technology according to claim 3, characterized in that, A fixing plate (9) is installed on the top wall of the box (2). An adjustable resistor (10) is installed at the bottom of the fixing plate (9). The two ends of the adjustable resistor (10) are electrically connected to two connecting terminals (15) respectively through connecting wires. A spring groove (25) and a sleeve groove (26) are provided on the side of the second electromagnet (13) away from the high-energy zinc oxide valve plate (17). The end of the spring (23) is installed in the spring groove (25). A sleeve (22) is installed in the sleeve groove (26). A guide rod is slidably installed in the sleeve (22). The end of the guide rod is fixed to the side of the first electromagnet (7).

5. A transformer DC blocking device based on zinc oxide equalization technology according to claim 1, characterized in that, The inner top wall of the box (2) is equipped with a heat dissipation copper column (11), and a number of heat dissipation holes (12) are opened on the heat dissipation copper column (11). The heat dissipation copper column (11) is connected to the high-energy zinc oxide valve plate (17) through a heat-conducting copper wire.

6. A transformer DC blocking device based on zinc oxide equalization technology according to claim 5, characterized in that, The top of the box (2) is provided with an air inlet and outlet hole (4), a filter screen is installed inside the air inlet and outlet hole (4), and a fan (8) is installed on the bottom wall of the box (2), with the fan (8) located directly below the air inlet and outlet hole (4).

7. A transformer DC blocking device based on zinc oxide equalization technology according to claim 1, characterized in that, The inner bottom wall of the box (2) is provided with a collection box (5), and the side of the box (2) is provided with a collection port that matches the collection box (5). The outer wall of the box (2) is hinged with a sealing plate (3), which covers the collection port. The bottom of the box (2) is fixed with a bottom plate (1), and a fixing hole is provided on the bottom plate (1).

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