A lightning protection contact for three-dimensional wound core transformer

Abstract

The present invention discloses a lightning protection contact for a three-dimensional wound iron core transformer, comprising a shell, an umbrella sleeve is arranged outside the shell, an insulating support body is arranged inside the shell, and a multi-layer zinc oxide resistor is arranged inside the insulating support body; a concave ring is arranged on the inner wall of the upper end of the insulating support body, a block made of a low-temperature alloy is embedded in the concave ring, a baffle is arranged below the block, a pop-up spring and a zinc oxide resistor are arranged below the baffle, an upper terminal is fixed above the baffle, and the lower part of the zinc oxide resistor is connected to the lower electrode. The advantages of the present invention are: when a lightning strike occurs, the lightning current is connected to the grounding terminal through the arrester, and at the same time, the connection with the power end is disconnected, thereby protecting the three-dimensional iron core transformer connected to the power end.

Description

Technical Field

[0001] The invention relates to the technical field of electric power equipment, in particular to a lightning arrester. Background Art

[0002] The three-dimensional wound core transformer is different from the traditional flat laminated core transformer. Its core is composed of a three-phase column yoke arranged in a three-dimensional triangle with a single frame. Each column is continuously rolled from high-quality cold-rolled silicon steel strips, and the width is sheared in a straight line or curve by a CNC cutting machine. After the strip is wound on the core winding machine to form a nearly circular or folded arc frame, it is annealed by vacuum nitrogen filling to eliminate processing stress, re-orient the lattice, improve magnetic permeability, and improve electromagnetic performance; the high and low voltage coils are wound directly on the core column paper tube using a special winding machine. The overall structure is solid and compact, and the body is insulated with upper and lower iron yokes and laminated wood. The surrounding pull screws tighten the coils to make it stable and reliable, and can withstand the impact of sudden short circuits. Due to the above characteristics, the three-dimensional wound core transformer is increasingly widely used; but when in use, in order to prevent damage to it by overvoltage caused by lightning strikes, corresponding lightning protection lines need to be set up. When overvoltage occurs, the power supply side should be connected to the ground through a lightning arrester, and it is best to disconnect it from the power supply side at the same time. Existing lightning arresters do not have this function; in this case, it is very easy to cause damage to electrical equipment when lightning strikes. Summary of the invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a lightning protection contact for a three-dimensional wound iron core transformer, comprising a shell, an umbrella sleeve is arranged outside the shell, an insulating support body is arranged inside the shell, and a multi-layer zinc oxide resistor is arranged inside the insulating support body; a concave ring is arranged on the inner wall of the upper end of the insulating support body, a block made of a low-temperature alloy is embedded in the concave ring, a baffle is arranged below the block, a pop-up spring and a zinc oxide resistor are arranged below the baffle, an upper terminal is fixed above the baffle, and the lower part of the zinc oxide resistor is connected to the lower electrode;

[0004] The upper terminal is inserted into the force-applying hole of the pressure-driven opening and closing wire clamp and abuts against the bottom of the plug-in block; the pressure-driven opening and closing wire clamp includes a base, and coaxial through holes are set on both sides of the base, and the power supply side electrode and the power consumption side electrode are both embedded in the through holes; a threaded through hole is set above the base, and a thread is set on the outer side of the sliding seat, the sliding seat is screwed into the threaded through hole, and a slideway is set in the middle of the sliding seat; one end of the plug-in block is a straight surface, and the other end is an inclined surface, the surface corresponding to the power supply side electrode and the plug-in block is a straight surface, and the surface corresponding to the power consumption side electrode and the plug-in block is an inclined surface; the plug-in block is set between the power supply side electrode and the power consumption side electrode; a sliding rod is set above the plug-in block, the sliding rod is inserted into the slideway, and a spring is mounted on the outside of the sliding rod; a force-applying hole is set below the base at a position corresponding to the plug-in block. A protective cover is set on the outside of the pressure-driven opening and closing wire clamp.

[0005] The advantages of the present invention are: when lightning strikes, the current melts the block, and the baffle pops up upward under the action of the pop-up spring, driving the upper terminal to move upward, thereby pressing the plug-in block to move upward. Since the contact surface between the plug-in block and the power supply side electrode is a straight surface, it always remains connected, and the contact surface between the plug-in block and the power consumption side is an inclined surface, so the plug-in block rises, causing the plug-in block and the power consumption side electrode to be disconnected. In this way, the lightning current is conducted to the grounding terminal through the lightning arrester, and at the same time, the connection with the power consumption end is disconnected, thereby protecting the three-dimensional iron core transformer connected to the power consumption end. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the structure of the invention;

[0007] Figure 2 It is a schematic diagram of the cooperation between the present invention and the pressure-driven opening and closing wire clamp. DETAILED DESCRIPTION

[0008] The present invention is described in detail below with reference to the accompanying drawings. As shown in the drawings, the present invention includes a housing 12, an umbrella cover is arranged outside the housing, an insulating support 19 is arranged inside the housing 12, and a multilayer zinc oxide resistor 18 is arranged inside the insulating support 19;

[0009] A concave ring is arranged on the inner wall of the upper end of the insulating support body, a stopper 13 made of a low temperature alloy is embedded in the concave ring, a baffle 15 is arranged below the stopper, a pop-up spring 14 and a zinc oxide resistor 18 are arranged below the baffle, an upper terminal 16 is fixed above the baffle 15, and the lower part of the zinc oxide resistor is connected to the lower electrode 17;

[0010] The wire clamp of the present invention includes a base 1, coaxial through holes are arranged on both sides of the base 1, and the power supply side electrode 2 and the power consumption side electrode 3 are both embedded in the through holes; a threaded through hole 7 is arranged on the top of the base, and a thread is arranged on the outer side of the sliding seat 6, the sliding seat 6 is screwed into the threaded through hole 7, and a slideway 8 is arranged in the middle of the sliding seat 6; one end of the plug-in block 4 is a straight surface, and the other end is an inclined surface, the surface corresponding to the power supply side electrode and the plug-in block is a straight surface 21, and the surface corresponding to the power consumption side electrode and the plug-in block is an inclined surface 31; the plug-in block 4 is arranged between the power supply side electrode 2 and the power consumption side electrode 3; a slide rod 5 is fixedly arranged on the top of the plug-in block, the slide rod 5 is inserted into the slideway 8, and a spring 9 is mounted on the outside of the slide rod 5; a force application hole 10 is arranged at a position corresponding to the plug-in block below the base.

[0011] The inclination angle of the inclined surface is 45 degrees.

[0012] A protective cover 11 is arranged on the outer side of the wire clamp.

[0013] The base is cylindrical.

[0014] The axis of the force application hole coincides with the axis of the sliding rod.

[0015] The elastic force of the pop-up spring 14 is much greater than the elastic force of the spring 9

[0016] When lightning strikes, the current melts the block 13, and the baffle 15 pops up under the action of the pop-up spring, driving the upper terminal 16 to move upward, thereby pressing the plug block 4 to move upward. Since the contact surface between the plug block and the power supply side electrode is a straight surface, it is always connected, and the contact surface between the plug block and the power consumption side is an inclined surface, so the plug block rises, causing the plug block and the power consumption side electrode to be disconnected. In this way, the lightning current is connected to the ground terminal through the lightning arrester, and at the same time, the connection with the power consumption end is disconnected. The power consumption end is connected to a three-dimensional iron core transformer.

[0017] The low temperature melting alloy is a bismuth-tin low melting alloy, and its melting temperature is 150°C.

Claims

1. A lightning protection contact for a three-dimensional wound core transformer, characterized in that: It comprises a shell, an umbrella cover is arranged outside the shell, an insulating support body is arranged inside the shell, and a multi-layer zinc oxide resistor is arranged inside the insulating support body; a concave ring is arranged on the inner wall of the upper end of the insulating support body, a stopper made of a low-temperature alloy is embedded in the concave ring, a baffle is arranged below the stopper, a pop-up spring and a zinc oxide resistor are arranged below the baffle, an upper terminal is fixed above the baffle, and the lower part of the zinc oxide resistor is connected to the lower electrode; The upper terminal is inserted into the force-applying hole of the pressure-driven opening and closing wire clamp and abuts against the bottom of the plug-in block; the pressure-driven opening and closing wire clamp comprises a base, coaxial through holes are arranged on both sides of the base, and the power supply side electrode and the power consumption side electrode are both embedded in the through holes; a threaded through hole is arranged above the base, a thread is arranged on the outer side of the sliding seat, the sliding seat is screwed into the threaded through hole, and a slideway is arranged in the middle of the sliding seat; one end of the plug-in block is a straight surface, and the other end is an inclined surface, the surface corresponding to the power supply side electrode and the plug-in block is a straight surface, and the surface corresponding to the power consumption side electrode and the plug-in block is an inclined surface; the plug-in block is arranged between the power supply side electrode and the power consumption side electrode; a sliding rod is arranged above the plug-in block, the sliding rod is inserted into the slideway, and a spring is mounted on the outside of the sliding rod; a force-applying hole is arranged below the base at a position corresponding to the plug-in block; The elastic force of the pop-up spring is greater than the elastic force of the outer sleeve spring of the slide rod; the low-temperature melting alloy is a bismuth-tin low-melting alloy.

2. The lightning protection contact for a three-dimensional wound core transformer according to claim 1, characterized in that: A protective cover is arranged outside the pressure-driven opening and closing wire clamp.

Images