A kind of magnetism-proof mutual inductor and electric meter

Abstract

The application relates to the field of mutual inductor devices, in particular to a magnetic shielding type mutual inductor and an electric meter. The magnetic shielding type mutual inductor comprises a magnetic shielding shell, a middle hole is arranged in the middle of the magnetic shielding shell, an iron core is arranged in the magnetic shielding shell, a plurality of groups of windings are wound around the outer periphery of the iron core, the number of turns of the windings is different, a fixing ring is arranged in the middle of the outer periphery of the iron core, a plurality of power connection ports are uniformly arranged on the outer periphery of the fixing ring, the power connection ports on the two sides are symmetrically distributed, two symmetric power connection ports form a group, different windings are respectively connected to the power connection ports in each group, a separation ring is arranged in the middle of the magnetic shielding shell, and a limiting ring is fixedly connected to the inner side of the separation ring. Through the linkage structure of the plurality of symmetric power connection ports and the rotating rings, the two rotating rings can be synchronously and reversely rotated by adjusting the adjusting knob to drive the adjusting gear, the power connection pieces can be precisely connected to the power connection ports corresponding to the windings with different numbers of turns, and the ratio adjustment is convenient and efficient.

Description

Technical Field

[0001] This invention relates to the field of instrument transformer equipment, and more particularly to an anti-magnetic instrument transformer and meter. Background Technology

[0002] Instrument transformers, as indispensable key equipment in power systems, primarily undertake the core functions of current and voltage transformation and signal transmission. They provide precise electrical signal support for metering, relay protection, and system control, and are widely used in various power scenarios such as industrial power distribution and residential power supply. As power systems develop towards higher voltage, higher current, and greater intelligence, more stringent requirements are placed on the detection accuracy, anti-interference capability, adaptability, and ease of operation of instrument transformers. However, existing instrument transformers still face several technical challenges in practical applications: Firstly, limited circuit adaptability. The fixed center-mounted hole structure of traditional instrument transformers makes it difficult to adapt to circuits of different diameters. The wires, and the detection circuit they pass through, lack effective support and restraint, making them prone to shaking under equipment operation or external disturbances, causing fluctuations in the induced magnetic field and further reducing detection accuracy. This is especially true in scenarios where the circuit needs to be routed back and forth multiple times, where the circuit is prone to entanglement and misalignment. Secondly, the ratio adjustment operation is cumbersome and unreliable. Existing adjustment structures mostly use plug-in or bolt-fixed types, requiring circuit interruption during adjustment, which is inconvenient. Furthermore, the electrical contacts are prone to poor contact due to the accumulation of dust, oxide layers, and other impurities over long-term use, affecting the accuracy and stability of the ratio adjustment. Therefore, we propose an anti-magnetic transformer and meter to solve the above-mentioned problems. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of the prior art by proposing an anti-magnetic transformer and meter.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a magnetically shielded transformer, comprising a magnetically shielded housing, a central hole in the middle of the magnetically shielded housing, an iron core installed inside the magnetically shielded housing, and multiple sets of windings wound around the outer periphery of the iron core, the number of turns of each winding being different; a fixing ring installed in the middle of the outer periphery of the iron core; and evenly distributed contact ports on both sides of the outer periphery of the fixing ring, the contact ports on both sides being symmetrically distributed, with two symmetrical contact ports forming a group; each group of contact ports is connected to different windings respectively; the magnetically shielded housing contains... A separator ring is installed in the middle, and a limit ring is fixedly connected to the inner side of the separator ring. Rotating rings are provided on both sides of the separator ring. Adjustment grooves and limit grooves are provided on the side of the rotating rings that are close to each other. Both ends of the limit rings are rotatably connected to the rotating rings through the limit grooves. A conductive ring groove is opened in the middle of the end of the rotating ring away from the separator ring. A conductive block is rotatably connected to the inner side of the conductive ring groove. A conductive plate is fixedly connected to the end of the conductive block. A terminal is installed on the end of the conductive plate away from the conductive block. The terminal is installed on both sides of the top of the antimagnetic housing.

[0005] Preferably, a slide block is installed on the upper and lower parts of the inner side of the central hole, and a slider is slidably connected to both sides of the slide block. A rotating sleeve is fixedly connected to the middle of the adjacent ends of the sliders. A damping rotating rod is rotatably connected between the upper and lower rotating sleeves, and multiple damping rotating disks are sleeved on the outer periphery of the damping rotating rod.

[0006] Preferably, an adjustment knob is rotatably connected to the top center of the antimagnetic housing, a fixed post is fixedly connected to the bottom center of the adjustment knob, an adjustment gear is fixedly connected to the lower outer periphery of the fixed post, the bottom of the fixed post and the adjustment gear are both rotatably connected to the upper part of the separator ring, and the front and rear parts of the adjustment gear are both meshed with the adjustment groove.

[0007] Preferably, an indicator dial is provided on one side of the adjustment knob, and the top periphery of the indicator dial is provided with evenly distributed markings. An indicator arrow is provided on one side of the top of the adjustment knob. The indicator dial is rotatably connected to the front side of the middle of the top of the antimagnetic housing, and a second annular groove is provided in the middle of the outer periphery of the indicator dial.

[0008] Preferably, the adjustment knob has a ring tooth groove in the middle of its outer periphery. A transmission gear is engaged with one side of the ring tooth groove, a transmission gear is engaged with the side of the transmission gear away from the ring tooth groove, and a ring tooth groove is engaged with the side of the transmission gear away from the transmission gear.

[0009] Preferably, a fixing frame is provided between the indicator dial and the adjustment knob. The fixing frame is installed inside the antimagnetic housing wall, and both the first transmission gear and the second transmission gear are rotatably connected to the inside of the fixing frame.

[0010] Preferably, the adjustment knob has evenly distributed slots on its outer periphery, and a fixing block is provided on the side of the adjustment knob away from the indicator dial. The fixing block is installed on the rear side of the top center of the antimagnetic housing, and a limit block is slidably connected to the upper part of the fixing block.

[0011] Preferably, a contact plate is installed on one side of the inside of the rotating ring, and a wiping plate is provided on both sides of the contact plate. The wiping plate and the contact plate are all corresponding to the contact port.

[0012] Preferably, mounting bases are installed on the front and rear sides of the bottom of the antimagnetic housing, and a top cover is installed on the top of the antimagnetic housing, with all wiring terminals located inside the top cover.

[0013] Preferably, an electricity meter includes a meter body, which is connected to an anti-magnetic transformer via connecting wires and terminals. The connecting wires pass through the top of a top cover, which protects the connection between the terminals and the connecting wires.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] This invention, through the damping rotating rod and multiple sets of damping turntables within the central hole, not only provides stable support for the inserted detection circuit, effectively suppressing the induced magnetic field fluctuations caused by circuit shaking and significantly improving detection accuracy; it also allows for flexible adaptation to circuit wires of different diameters by rotating the damping turntables to switch the orientation of the long and short sides. Furthermore, in scenarios where the circuit is repeatedly passed through, it achieves precise separation and limitation of the surrounding circuit. Its adaptability and practicality are significantly superior to those of traditional current transformers with fixed aperture structures.

[0016] This invention utilizes a multi-set symmetrical connection port and rotating ring linkage structure. By adjusting the knob to drive the adjustment gear, the rotating rings on both sides can rotate synchronously in opposite directions, achieving precise connection between the connection plate and the connection port corresponding to different number of turns of the winding. This makes the ratio adjustment convenient and efficient. Furthermore, the wiping plates on both sides of the connection plate can make contact with the target connection port in advance and complete the wiping during the adjustment process, effectively removing impurities from the contact surface. This avoids the poor contact problems commonly found in traditional adjustment structures and ensures the stability of the circuit connection after adjustment.

[0017] This invention utilizes a linkage design between the ring tooth groove, the transmission gear set, and the indicator dial. When the adjustment knob is rotated, it synchronously drives the indicator dial to deflect, achieving a clear display of the adjustment level and solving the problem of unclear adjustment levels in traditional current transformers. After adjustment, the locking structure, through the locking block engaging with the adjustment knob slot, effectively resists the risk of knob misalignment caused by equipment vibration, further ensuring power connection stability. Compared to traditional products without a locking structure, the reliability is significantly improved. Attached Figure Description

[0018] Figure 1This is a frontal three-dimensional structural diagram of the current transformer of the anti-magnetic current transformer and meter of the present invention.

[0019] Figure 2 This is a rear-view three-dimensional structural diagram of an anti-magnetic transformer and an electricity meter according to the present invention.

[0020] Figure 3 This is a partial structural diagram of the transformer center hole of the antimagnetic transformer and meter of the present invention.

[0021] Figure 4 This is a partial structural diagram of the adjustment knob of the antimagnetic transformer and meter of the present invention;

[0022] Figure 5 This is a schematic diagram of the internal structure of the antimagnetic housing of an antimagnetic transformer and meter according to the present invention.

[0023] Figure 6 This is a partial structural diagram of the transmission gear one and transmission gear two of an antimagnetic transformer and meter according to the present invention.

[0024] Figure 7 This is a partial structural diagram of the fixing post of the antimagnetic transformer and meter of the present invention;

[0025] Figure 8 This is a partial structural diagram of the adjusting gear and adjusting tooth groove of an antimagnetic transformer and meter according to the present invention.

[0026] Figure 9 This is a partial structural diagram of the rotating and fixed rings of an antimagnetic transformer and meter according to the present invention.

[0027] 101. Antimagnetic housing; 102. Top cover; 103. Mounting base; 104. Center hole; 105. Slide block; 106. Rotating sleeve; 107. Slider; 108. Damping turntable; 109. Damping rod; 110. Indicator dial; 111. Adjustment knob; 112. Fixing block; 113. Terminal block; 114. Limiting block; 115. Winding; 116. Rotary ring; 117. Conductive sheet; 118. Conductive ring 119. Slot; 120. Iron core; 121. Ring tooth slot one; 122. Fixing frame; 123. Transmission gear one; 124. Transmission gear two; 125. Ring tooth slot two; 126. Conductive block; 127. Fixing ring; 128. Limiting ring; 129. Separating ring; 130. Fixing column; 131. Adjusting gear; 132. Adjusting tooth groove; 133. Electrical connection port; 134. Wiping plate; 135. Electrical connection plate; 136. Limiting slot. Detailed Implementation

[0028] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0029] like Figures 1-9 The magnetically shielded transformer shown includes a magnetically shielded housing 101 with a central hole 104 in the middle. An iron core 119 is installed inside the housing 101, and multiple windings 115 are wound around the outer periphery of the iron core 119. Each rotating ring 116 has a conductive ring groove 118 at its center on the side furthest from the separating ring 128. Conductive blocks 125 are rotatably connected to the inner side of each conductive ring groove 118. Conductive plates 117 are fixedly connected to the ends of each conductive block 125. Terminals 113 are installed on the ends of each conductive plate 117 furthest from the conductive block 125. The terminals 113 are all mounted on the top of the magnetically shielded housing 101. On both sides, mounting bases 103 are installed on the front and rear sides of the bottom of the antimagnetic housing 101, and a top cover 102 is installed on the top of the antimagnetic housing 101. The wiring terminals 113 are all located inside the top cover 102. Slide seats 105 are installed on the upper and lower parts of the inner side of the central hole 104. Slider blocks 107 are slidably connected on both sides of the slide seat 105. Rotating sleeves 106 are fixedly connected to the middle of the adjacent ends of the sliders 107. Damping rods 109 are rotatably connected between the upper and lower rotating sleeves 106. Multiple damping discs 108 are sleeved on the outer periphery of the damping rods 109. Except for the conductive parts, the above structures are all made of insulating material.

[0030] Furthermore, in practical implementation, the device can be installed inside the meter box using fixing bolts and mounting base 103. After installation, the circuit to be tested can be passed through the central hole 104. The damping disc 108 on the damping rod 109 can support the circuit, ensuring stability during operation and preventing fluctuations in the induced magnetic field caused by circuit shaking, which could affect the testing accuracy. When the circuit needs to be passed through multiple times, multiple damping discs 108 can separate and limit the surrounding circuit. By rotating the damping disc 108, the orientation of its long and short sides can be switched, making it suitable for circuit wires of different diameters, which is beneficial for practical use.

[0031] The windings 115 have different numbers of turns. A fixing ring 126 is installed in the middle of the outer periphery of the iron core 119. Evenly distributed power connection ports 132 are provided on both sides of the fixing ring 126. The power connection ports 132 on both sides are symmetrically distributed, and two symmetrical power connection ports 132 form a group. Each group of power connection ports 132 is connected to a different winding 115. A separator ring 128 is installed in the middle of the anti-magnetic housing 101. A limit ring 127 is fixedly connected to the inner side of the separator ring 128. Rotating rings 116 are provided on both sides of the separator ring 128. Adjusting grooves 131 and limiting grooves 135 are provided on the side of the rotating rings 116 that are close to each other. Both ends of the limiting ring 127 pass through the limiting grooves 135. 5 is rotatably connected to the rotating ring 116. An adjustment knob 111 is rotatably connected to the top center of the antimagnetic housing 101. A fixing post 129 is fixedly connected to the bottom center of the adjustment knob 111. An adjustment gear 130 is fixedly connected to the lower outer periphery of the fixing post 129. The bottom of the fixing post 129 and the adjustment gear 130 are rotatably connected to the upper part of the partition ring 128. The front and rear parts of the adjustment gear 130 are meshed with the adjustment groove 131. A contact plate 134 is installed on one side inside the rotating ring 116. A rubbing plate 133 is provided on both sides of the contact plate 134. The rubbing plate 133 and the contact plate 134 are corresponding to the contact port 132. Except for the conductive parts, the above structures are all made of insulating material.

[0032] Furthermore, in practical implementation, the transformer detection ratio can be adjusted by adjusting knob 111 according to the circuit conditions and testing requirements. When the adjusting knob 111 is turned, the fixing post 129 at the bottom of the adjusting knob 111 drives the adjusting gear 130 to rotate synchronously. The adjusting gear 130 drives the rotating rings 116 on both sides to rotate synchronously in opposite directions through the meshing adjusting tooth grooves 131 on both sides. During this process, the limiting rings 127 and limiting grooves 135 can limit the rotation of the rotating rings 116. Multiple symmetrical power connection ports 132 are provided on both sides of the circumference of the fixing ring 126. Two symmetrical power connection ports 132 form a group, and each group of power connection ports 132 corresponds to a winding 115 with a different number of turns. The position of the wiping pad 133 and the contact pad 134 on the inner side of the rotating ring 116 can be adjusted by rotating the ring, so that the contact pad 134 can contact different contact ports 132 to adjust the transformation ratio. In this process, the wiping pads 133 on both sides of the contact pad 134 can connect the contact pad 134 to the contact port 132 to be contacted in advance during adjustment. The wiping pads 133 can wipe the contact port 132. The outer periphery of the fixing ring 126 is wrapped with an anti-static cleaning cloth. The anti-static cleaning cloth on the outer periphery of the fixing ring 126 can wipe the contact pad 134, thereby avoiding the occurrence of poor contact due to impurities between the contact pad 134 and the contact port 132, which is beneficial to the actual adjustment work.

[0033] The adjustment knob 111 has an indicator dial 110 on one side. The top periphery of the indicator dial 110 has evenly distributed markings. An indicator arrow is located on one side of the top of the adjustment knob 111. The indicator dial 110 is rotatably connected to the front of the top center of the anti-magnetic housing 101. A second annular groove 124 is located in the center of the outer periphery of the indicator dial 110. A first annular groove 120 is located in the center of the outer periphery of the adjustment knob 111. A first transmission gear 122 is meshed with one side of the first annular groove 120. A second transmission gear 123 is meshed with the side of the first transmission gear 122 away from the first annular groove 120. The second transmission gear 123 is meshed with the side of the first transmission gear 122 away from the first transmission gear 122. A ring tooth groove 124 is engaged on one side. A fixing frame 121 is provided between the indicator dial 110 and the adjustment knob 111. The fixing frame 121 is installed inside the wall of the antimagnetic housing 101. The transmission gear 122 and the transmission gear 2 123 are rotatably connected to the inside of the fixing frame 121. The outer periphery of the adjustment knob 111 has evenly distributed slots. A fixing block 112 is provided on the outer periphery of the adjustment knob 111 away from the indicator dial 110. The fixing block 112 is installed on the rear side of the middle of the top of the antimagnetic housing 101. A limit block 114 is slidably connected to the upper part of the fixing block 112. Except for the conductive parts, all of the above structures are made of insulating material.

[0034] Furthermore, in specific implementation, when the adjustment knob 111 is rotated, the annular groove 120 on its periphery drives the transmission gear 122, which in turn drives the transmission gear 123, which in turn drives the transmission gear 123, which in turn drives the indicator dial 110 to rotate synchronously with the adjustment knob 111 through the annular groove 124 on the other side of the transmission gear 123. This causes the fixing ring 126 to deflect and switch to a connected power port 132 after the adjustment knob 111 rotates one revolution, while the indicator dial 110 rotates one increment. The indicator shows the current gear position for easy use. After adjustment, the user can move the limit block 114 so that its end engages in the external groove of the adjustment knob 111, thus limiting the adjustment knob 111 and preventing it from deflecting due to vibration during operation, which could affect the contact between the contact piece 134 and the contact port 132. After adjustment, the user can connect the current transformer to the meter through the wiring terminal 113. The current transformer then assists the meter in measuring, metering, relay protection, and control monitoring of the power system, which is beneficial for circuit testing.

[0035] One type of electricity meter includes a meter body, which is connected to an anti-magnetic transformer via a connecting wire and a terminal block 113. The connecting wire passes through the top of a top cover 102, which is used to protect the connection between the terminal block 113 and the connecting wire.

[0036] Working principle:

[0037] In practical use, the device can be installed inside the meter box using fixing bolts and mounting base 103. After installation, the circuit to be tested can be passed through the central hole 104. The damping disc 108 on the damping rod 109 supports the circuit, ensuring stability during operation and preventing fluctuations in the induced magnetic field caused by circuit shaking, which could affect testing accuracy. When the circuit needs to be passed through multiple times, multiple damping discs 108 can separate and limit the surrounding circuit. Rotating the damping disc 108 allows for switching the orientation of its long and short sides, making it suitable for circuit wires of different diameters, which is beneficial for practical use. Afterwards, the device can be used according to the circuit conditions and testing requirements. The transformer's detection ratio is adjusted by adjusting knob 111. When knob 111 is turned, the fixed post 129 at the bottom of knob 111 drives the adjusting gear 130 to rotate synchronously. The adjusting gear 130, through the meshing adjusting tooth grooves 131 on both sides, drives the rotating rings 116 on both sides to rotate synchronously in opposite directions. During this process, the limiting rings 127 and limiting grooves 135 limit the rotation of the rotating rings 116. Multiple symmetrical contact ports 132 are provided on both sides of the circumference of the fixed ring 126. Two symmetrical contact ports 132 form a group, and each group of contact ports 132 corresponds to a winding 115 with a different number of turns. Rotation allows the contact plates 133 and contact plates 134 on the inner side of the rotating rings 116 to be adjusted. Position adjustment allows the contact piece 134 to contact different contact ports 132, thereby adjusting the transformer ratio. During this process, the wiping pads 133 on both sides of the contact piece 134 allow the contact piece 134 to be pre-contacted with the desired contact port 132. The wiping pads 133 clean the contact port 132, and the fixing ring 126 cleans the contact piece 134, thus preventing poor contact caused by impurities between the contact piece 134 and the contact port 132, which is beneficial for the actual adjustment work. During the adjustment process, when the adjustment knob 111 is rotated, the peripheral ring tooth groove 120 drives the transmission gear 122 meshing with it to rotate. The transmission gear 122 can... The transmission gear 123 meshing with it rotates synchronously, which in turn drives the indicator dial 110 and the adjustment knob 111 to deflect synchronously through the meshing ring tooth groove 124 on the other side of the transmission gear 123. This causes the fixed ring 126 to deflect and switch to a new contact port 132 after the adjustment knob 111 rotates one revolution. Simultaneously, the indicator dial 110 deflects and rotates one mark, indicating the current gear position for ease of use. After adjustment, the user can move the limit block 114, causing its end to engage in the external groove of the adjustment knob 111, thus limiting the adjustment knob 111 and preventing it from deflecting due to vibrations during equipment operation, which could affect the contact between the contact plate 134 and the contact port 132. After adjustment...The current transformer can be connected to the electricity meter via terminal block 113. The current transformer then assists the electricity meter in measuring, metering, relay protection, and monitoring the power system, which is beneficial for circuit testing.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A magnetically shielded current transformer, comprising a magnetically shielded housing (101), characterized in that: The antimagnetic housing (101) has a central hole (104) in the middle. An iron core (119) is installed inside the antimagnetic housing (101). Multiple windings (115) are wound around the outer periphery of the iron core (119). The number of turns of each winding (115) is different. A fixing ring (126) is installed in the middle of the outer periphery of the iron core (119). A uniformly distributed power connection port (132) is provided on both sides of the outer periphery of the fixing ring (126). The power connection ports (132) on both sides are symmetrically distributed and have two pairs. The power inlets (132) are grouped together, and each group of power inlets (132) is connected to a different winding (115). A separator ring (128) is installed in the middle of the antimagnetic housing (101). A limit ring (127) is fixedly connected to the inner side of the separator ring (128). Rotary rings (116) are provided on both sides of the separator ring (128). An adjusting tooth groove (131) and a limit groove (135) are provided on the side of the rotating ring (116) that are close to each other. The two ends of the limit ring (127) are... All are rotatably connected to the rotating ring (116) via a limiting groove (135). A conductive ring groove (118) is provided in the middle of the end of the rotating ring (116) away from the separating ring (128). A conductive block (125) is rotatably connected to the inner side of each conductive ring groove (118). A conductive sheet (117) is fixedly connected to the end of each conductive block (125). A terminal block (113) is installed at the end of each conductive sheet (117) away from the conductive block (125). The terminal block (113) is installed on a protective... On both sides of the top of the magnetic housing (101), an adjustment knob (111) is rotatably connected to the middle of the top of the antimagnetic housing (101). A fixing post (129) is fixedly connected to the middle of the bottom of the adjustment knob (111). An adjustment gear (130) is fixedly connected to the lower outer periphery of the fixing post (129). The bottom of the fixing post (129) and the adjustment gear (130) are rotatably connected to the upper part of the partition ring (128). The front and rear parts of the adjustment gear (130) are meshed with the adjustment tooth groove (131).

2. The anti-magnetic transformer according to claim 1, characterized in that: Slide seats (105) are installed on the upper and lower parts of the inner side of the central hole (104). Slide blocks (107) are slidably connected on both sides of the slide seats (105). Rotating sleeves (106) are fixedly connected to the middle of the adjacent ends of the sliders (107). Damping rods (109) are rotatably connected between the upper and lower rotating sleeves (106). Multiple damping discs (108) are sleeved on the outer periphery of the damping rods (109).

3. The anti-magnetic transformer according to claim 1, characterized in that: An indicator dial (110) is provided on one side of the adjustment knob (111). The top periphery of the indicator dial (110) is provided with evenly distributed markings. An indicator arrow is provided on one side of the top of the adjustment knob (111). The indicator dial (110) is rotatably connected to the front side of the middle of the top of the antimagnetic housing (101). The middle of the outer periphery of the indicator dial (110) is provided with a second annular groove (124).

4. The anti-magnetic transformer according to claim 3, characterized in that: The adjustment knob (111) has a ring tooth groove (120) in the middle of its outer periphery. A transmission gear (122) is meshed with one side of the ring tooth groove (120). A transmission gear (123) is meshed with the side of the transmission gear (122) away from the ring tooth groove (120). A ring tooth groove (124) is meshed with the side of the transmission gear (123) away from the transmission gear (122).

5. A magnetically shielded current transformer according to claim 4, characterized in that: A fixing frame (121) is provided between the indicator dial (110) and the adjustment knob (111). The fixing frame (121) is installed inside the wall of the antimagnetic housing (101). The first transmission gear (122) and the second transmission gear (123) are rotatably connected to the inside of the fixing frame (121).

6. A magnetically shielded current transformer according to claim 5, characterized in that: The adjustment knob (111) has evenly distributed slots on its outer periphery. A fixing block (112) is provided on the side of the adjustment knob (111) away from the indicator dial (110). The fixing block (112) is installed on the rear side of the top center of the antimagnetic housing (101). A limit block (114) is slidably connected to the upper part of the fixing block (112).

7. A magnetically shielded current transformer according to claim 1, characterized in that: A contact plate (134) is installed on one side of the inside of the rotating ring (116), and a wiping plate (133) is provided on both sides of the contact plate (134). The wiping plate (133) and the contact plate (134) are both corresponding to the contact port (132).

8. A magnetically shielded current transformer according to claim 1, characterized in that: The antimagnetic housing (101) is equipped with mounting bases (103) on both the front and rear sides of the bottom, and a top cover (102) is installed on the top of the antimagnetic housing (101). The wiring terminals (113) are all located inside the top cover (102).

9. An electricity meter for use with an anti-magnetic transformer as described in any one of claims 1-8, comprising a meter body, characterized in that: The main body of the meter is connected to the anti-magnetic transformer via connecting wires and terminals (113). The connecting wires pass through the top of the cover (102), which is used to protect the connection between the terminals (113) and the connecting wires.

Images