Online detection equipment for partial discharge of transformer

Abstract

The invention belongs to the technical field of transformer discharge detection, and particularly relates to on-line detection equipment for transformer partial discharge, which comprises a base, a detection mechanism arranged on the base, a connecting line mounted below the detection mechanism and a mounting mechanism arranged at one end, far away from the detection mechanism, of the connecting line, according to the invention, through the arrangement of the installation mechanism, the monitoring assembly can be automatically adjusted to adapt to cables with different diameters, and then the protection assembly is fixed outside the monitoring assembly, so that the exposed part of the cable and the monitoring assembly are completely wrapped, and the cable is protected. The whole cable is still in an insulation state, normal use of the cable is maintained, the cable is kept dry, electric leakage caused by damp and contact with the outside is avoided, extra supporting protection is performed on the monitoring assembly, the situation that the cable is separated from the cable part, a cable core at the peeling position is exposed outside, and the electric leakage risk is caused is avoided, and the monitoring process is more stable.

Description

Technical Field

[0001] This invention belongs to the field of transformer discharge detection technology, specifically an online detection device for partial discharge in transformers. Background Technology

[0002] When partial discharge occurs inside a transformer, it is accompanied by physical phenomena or chemical changes such as electrical pulses, ultrasound, light, and heat. As long as partial discharge exists inside the transformer, high-frequency electrical disturbances will inevitably be generated and will propagate to all connected electrical circuits. Therefore, pulse currents flow through the neutral point grounding wire, oil tank grounding wire, etc., and pulse current sensors are used to detect partial discharge signals at these measurement points to achieve online monitoring of the transformer's partial discharge.

[0003] The grounding wire through-hole installation is the most classic and standard installation method for high-frequency current transformer sensors in partial discharge monitoring. During installation, the grounding wire needs to be passed through the round hole in the center of the sensor. The insulation layer of the grounding wire needs to be stripped so that the metal conductor can pass directly through the center of the sensor. However, the part in contact with the sensor is prone to moisture, which affects the service life of the sensor. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the technical solution adopted by this invention is: an online detection device for partial discharge in transformers, comprising a base, and further comprising:

[0005] The cable includes a detection mechanism mounted on a base, a connecting line installed below the detection mechanism, and an installation mechanism located at the end of the connecting line away from the detection mechanism, wherein the installation mechanism is sleeved on the outside of the cable.

[0006] The installation mechanism includes an installation block disposed at one end of the connecting line, a protective component disposed on the outside of the installation block, and a monitoring component installed inside the protective component, wherein the monitoring component is sleeved on the outside of the cable.

[0007] Furthermore, the testing institution includes:

[0008] A protective case, which is mounted on top of the base;

[0009] The main unit is installed inside the protective enclosure;

[0010] A connector is installed below the main unit, and the end of the connector is connected to a connecting cable.

[0011] Furthermore, the testing institution also includes:

[0012] A sleeve is fitted onto the end of the connecting line that is furthest from the protective box.

[0013] A slide rail, which is installed on the outside of the protective box;

[0014] An adjusting plate is slidably connected inside the slide rail, and the lower part of the adjusting plate is sleeved with the outside of the sleeve.

[0015] Furthermore, the testing institution also includes:

[0016] A dispersion assembly, which is mounted on the outside of the protective enclosure;

[0017] A locking block, the outside of which is slidably connected to the inside of the adjusting plate;

[0018] The first locking rod is inserted inside the locking block and the adjusting plate. The first locking rod fixes the locking block and is used to fix the adjusting plate in the slide rail. The fixing position of the adjusting plate is selected according to the height of the cable at different positions.

[0019] Furthermore, the testing institution also includes:

[0020] The second lever is inserted inside the slide and the adjusting plate;

[0021] A connecting ring is sleeved on the outside of the mounting block, and the connecting ring rotates coaxially with the mounting block outside the mounting block;

[0022] An adjusting rod, one end of which is mounted on the outside of the locking block, and the other end of which is connected to the outside of the connecting ring.

[0023] Further, the distributed component includes:

[0024] A housing, which is installed on the outside of the protective enclosure;

[0025] A rotating plate, which is rotatably connected to the outside of the protective box, and three rotating plates are arranged side by side;

[0026] A telescopic rod is installed below the rotating plate, and a connecting sleeve is installed below the telescopic rod for fixing the connecting wire;

[0027] A limiting post is slidably connected inside the cover.

[0028] Furthermore, the protective component includes:

[0029] The housing consists of two parts that are fitted over the cable. The interior of the housing is connected to the exterior of the mounting block. The two ends of the exterior of the housing are provided with slots and rubber interfaces. The middle part is made of a transparent or semi-transparent material (such as polycarbonate), which allows for inspection without opening the cover: it is possible to directly observe whether there are any abnormalities inside.

[0030] A deflector is installed above the housing. The deflector is designed in an umbrella shape to reduce rainwater accumulation above the cable and housing mounting.

[0031] Furthermore, the protective component also includes:

[0032] An airbag is installed inside the shell and placed at the connection point of the shell. The airbag can drive the water-absorbing strip to contact the connection point of the shell to ensure a seal.

[0033] A water-absorbing strip is installed on the outside of the airbag and placed inside the shell connection to prevent moisture intrusion.

[0034] The spring is installed inside the airbag and can continue to support the airbag for a period of time after the airbag loses its elasticity. The airbag's airtight material continues to maintain a sealing effect and prevents the spring from rusting.

[0035] Furthermore, the monitoring component includes:

[0036] The sensor is rotatably connected to the mounting block. The sensor is divided into two parts and fixed by nuts. The sensor is sleeved on the outside of the cable. The sensor is set as two semicircles. In use, the two ends of the sensor are opened to allow the stripped cable core to be clamped inside the sensor.

[0037] A copper pillar is installed inside the sensor and is in contact with the outside of the cable;

[0038] A connecting block is disposed at one end of the copper pillar;

[0039] A restraint ring is fitted around the end of the copper column away from the connecting block.

[0040] The beneficial effects of this invention are as follows:

[0041] 1. This invention, through the installation mechanism, allows the monitoring component to adjust autonomously to adapt to cables of different diameters. Subsequently, the protective component is fixed to the outside of the monitoring component, completely enclosing the exposed part of the cable and the monitoring component, and protecting this section of the cable. This ensures that the cable remains in an insulated state, maintains the normal use of the cable, keeps the cable dry, and prevents leakage caused by moisture or contact with the outside environment.

[0042] 2. This invention provides a monitoring mechanism that uses an adjusting rod, adjusting plate, and sleeve to support the connection between the connecting cable and the monitoring component. Normally, sensors installed outside the cable are directly fixed to the cable. However, installing additional components on a vertical cable can cause extra strain on the cable under gravity. Furthermore, if the cable is not securely fixed, it may detach from the cable, exposing the stripped wire core and posing a risk of electric leakage. Therefore, providing additional support and protection for the monitoring component makes the monitoring process more stable.

[0043] 3. This invention incorporates a protective component. The airbag moves the absorbent strip close to the seam where the shell is connected, blocking the seam and preventing water from seeping through and directly contacting the cables if the shell becomes loose. A humidity sensor is added inside the absorbent strip, which can promptly alert staff when the humidity is too high. As the airbag gradually loses its elasticity over time, the spring can also support the absorbent strip, extending the waterproof and dustproof effect of the shell and providing staff with extra time for maintenance.

[0044] 4. This invention, by setting up a monitoring component, addresses the issue that the sensor's measurement accuracy is directly related to the cross-sectional area of ​​the magnetic core and the number of coil turns, making its inner diameter difficult to change. Therefore, during installation, when the cable diameter cannot match the sensor's inner diameter, multiple sets of copper pillars are inserted, and the other end of the copper pillars is attached to the cable using a binding strap. The sensor is then wrapped around the copper pillars and the cable, and the other end of the sensor is fixed with a nut. This expands the cable's connection diameter, allowing sensors with larger inner diameters to be fixed to the cable, thus enabling the monitoring of cables with different diameters. Attached Figure Description

[0045] Figure 1 This is a schematic diagram of the structure of the present invention;

[0046] Figure 2 This is a side view of the present invention;

[0047] Figure 3 This is a schematic diagram of the detection mechanism of the present invention;

[0048] Figure 4 This is a partial structural schematic diagram of the detection mechanism of the present invention;

[0049] Figure 5 This is a cross-sectional view of the mounting mechanism of the present invention;

[0050] Figure 6 This is a schematic diagram of the structure of the protective component of the present invention;

[0051] Figure 7 This is a schematic diagram of the monitoring component of the present invention;

[0052] Figure 8This is a schematic diagram of the structure of the dispersion component of the present invention.

[0053] In the diagram: 1. Base; 2. Detection mechanism; 201. Protective box; 202. Main unit; 203. Connector; 204. Sleeve; 205. Adjusting plate; 206. Dispersion assembly; 2061. Cover; 2062. Rotating plate; 2063. Telescopic rod; 2064. Connecting sleeve; 2065. Limiting post; 207. Slide rail; 208. Locking block; 209. First locking rod; 210. Adjusting rod; 211. Connecting ring; 2 12. Second lever; 3. Connecting line; 4. Mounting mechanism; 401. Mounting block; 402. Protective component; 4021. Housing; 4022. Slot; 4023. Flow deflector; 4024. Spring; 4025. Airbag; 4026. Water absorption strip; 403. Monitoring component; 4031. Sensor; 4032. Nut; 4033. Copper pillar; 4034. Connecting block; 4035. Restraint ring; 5. Cable. Detailed Implementation

[0054] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and design various embodiments with various modifications suitable for a particular purpose.

[0055] Example 1, please refer to Figures 1-5 The present invention provides a technical solution: an online detection device for partial discharge of transformers, which is described below.

[0056] Including base 1, it also includes:

[0057] The detection mechanism 2 is set on the base 1, the connecting line 3 is installed below the detection mechanism 2, and the mounting mechanism 4 is set at the end of the connecting line 3 away from the detection mechanism 2. The mounting mechanism 4 is sleeved on the outside of the cable 5.

[0058] During installation, after power is turned off, the outer layer of the cable 5, which is far from the ground, is stripped off. Then, the installation mechanism 4 is placed on the outside of the cable 5, so that the connecting wire 3 connects the detection mechanism 2 to the installation. When power is turned on, the installation mechanism 4 monitors the cable 5 in real time.

[0059] The installation mechanism 4 includes an installation block 401 disposed at one end of the connecting line 3, a protective component 402 disposed outside the installation block 401, and a monitoring component 403 installed inside the protective component 402. The monitoring component 403 is sleeved on the outside of the cable 5.

[0060] Initially, the monitoring assembly is fixed to the outside of the cable 5. The monitoring component 403 can adjust itself to adapt to cables 5 of different diameters. Then, the protective component 402 is fixed to the outside of the monitoring component 403, so that the exposed part of the cable 5 and the monitoring component 403 are completely wrapped and protected. This section of the cable 5 is protected so that the cable 5 remains in an insulated state, maintaining the normal use of the cable 5, keeping the cable 5 dry, and preventing leakage caused by moisture and contact with the outside.

[0061] Testing agency 2 includes:

[0062] Protective box 201 is installed above base 1;

[0063] Main unit 202 is installed inside protective box 201;

[0064] Connector 203 is installed below the host 202, and the end of connector 203 is connected to connector 3.

[0065] Testing agency 2 also includes:

[0066] Sleeve 204 is fitted onto the end of connecting line 3 that is away from protective box 201;

[0067] Slide 207 is installed on the outside of the protective box 201;

[0068] Adjusting plate 205 is slidably connected inside slide rail 207, and the lower part of adjusting plate 205 is sleeved with the outside of sleeve 204.

[0069] Testing agency 2 also includes:

[0070] Dispersion component 206 is installed on the outside of protective housing 201;

[0071] The outer part of the locking block 208 is slidably connected to the inner part of the adjusting plate 205;

[0072] The first locking rod 209 is inserted inside the locking block 208 and the adjusting plate 205. The first locking rod 209 fixes the locking block 208 and is used to fix the adjusting plate 205 in the slide rail 207. The fixing position of the adjusting plate 205 is selected according to the height of the cable 5 at different positions.

[0073] Testing agency 2 also includes:

[0074] The second lever 212 is inserted into the slide 207 and the adjusting plate 205;

[0075] Connecting ring 211 is sleeved on the outside of mounting block 401, and the connecting ring 211 rotates coaxially with mounting block 401 on the outside of mounting block 401.

[0076] Adjusting rod 210, one end of which is installed on the outside of the locking block 208, and the other end of which is connected to the outside of the connecting ring 211.

[0077] During installation, the connecting wire 3 is connected to the connector 203. By setting multiple connectors 203, the host 202 can monitor the cables 5 at different positions simultaneously. The dispersing component 206 is used to separate and fix multiple sets of connecting wires 3 that are connected at the same time to avoid tangling. The slide 207 and the adjusting plate 205 can be set on the outside of the protective box 201 to fix and adjust the connecting wires 3 in different directions. Then, an adjusting rod 210 of appropriate length is selected. The adjusting rod 210, the adjusting plate 205 and the sleeve 204 are used to support the part where the connecting wire 3 is connected to the monitoring component 403. Normally, the sensor 4031 installed outside the cable 5 is directly fixed to the cable 5. However, since the vertical cable 5 has additional components installed, it will cause additional burden on the cable 5 under the action of gravity. If it is not fixed firmly, it will detach from the cable 5, thus exposing the stripped wire core to the outside, causing leakage risk. Therefore, additional support and protection for the monitoring component 403 can make the monitoring process more stable.

[0078] Example 2, please refer to Figures 1-8 The present invention provides a technical solution: based on embodiment 1, the dispersion component 206 includes:

[0079] Cover 2061, cover 2061 is installed on the outside of protective box 201;

[0080] Rotating plate 2062 is rotatably connected to the outside of protective box 201, and three rotating plates 2062 are arranged side by side;

[0081] Telescopic rod 2063 is installed below rotating plate 2062. Connecting sleeve 2064 is installed below telescopic rod 2063. Connecting sleeve 2064 is used to fix connecting line 3.

[0082] The limiting post 2065 is slidably connected inside the cover 2061.

[0083] The dispersing component 206 includes multiple coaxially connected turntables. During use, the connecting wires 3 are passed through the connecting sleeve 2064, allowing the turntables to be adjusted and separated to form different angles. After the telescopic rod 2063 is moved to different positions, it is bypassed by the extension and retraction of the telescopic rod 2063 and finally rests on the limit post 2065, thus achieving the purpose of separating multiple sets of connecting wires 3 from the location near the host 202.

[0084] Protective component 402 includes:

[0085] The housing 4021 is divided into two parts and is fitted over the outside of the cable 5. The inside of the housing 4021 is connected to the outside of the mounting block 401. The two ends of the housing 4021 are provided with slots 4022. The two ends of the housing 4021 are set as rubber interfaces. The middle part is made of transparent or semi-transparent material (such as polycarbonate), which allows for inspection without opening the cover: it is possible to directly observe whether there are any abnormalities inside.

[0086] The fairing 4023 is installed above the housing 4021. The fairing 4023 is designed in an umbrella shape to reduce rainwater accumulation on the cable 5 above the housing 4021.

[0087] Protective component 402 also includes:

[0088] Airbag 4025 is installed inside housing 4021. Airbag 4025 is placed at the connection of housing 4021. Airbag 4025 can drive water-absorbing strip 4026 to contact the connection of housing 4021 to ensure a seal.

[0089] Water-absorbing strip 4026 is installed on the outside of airbag 4025 and placed inside the connection of housing 4021 to prevent moisture intrusion.

[0090] Spring 4024 is installed inside airbag 4025. After airbag 4025 loses its elasticity, it can still support for a period of time. The airtight material of airbag 4025 continues to maintain the sealing effect and prevents spring 4024 from rusting.

[0091] After installing the sensor 4031, fit the two pieces of the housing 4021 over the outside of the sensor 4031 and connect them. Additional restraint components such as cable ties can be installed in the slot 4022 to ensure the housing 4021 fits over the exposed portion of the cable 5 and tightens the port. Then, fix the flow guide 4023 above the housing 4021. Inflate the airbag 4025, causing it to pull the absorbent strip 4026 close to the seam where the housing 4021 is connected, thus blocking the seam. To prevent water from seeping through the gaps in the housing 4021 after it becomes loose, which could lead to direct contact with the cable 5, a humidity sensor 4031 is added inside the water-absorbing strip 4026. When the humidity of the water-absorbing strip 4026 is too high, it can promptly alert the staff that the housing 4021 is leaking water. During the long-term use of the airbag 4025, as it gradually loses its elasticity, the spring 4024 can also support the water-absorbing strip 4026, extending the waterproof and dustproof effect of the housing 4021 and providing the staff with time for maintenance.

[0092] Monitoring component 403 includes:

[0093] Sensor 4031 is rotatably connected to mounting block 401. Sensor 4031 is divided into two parts and fixed by nuts 4032. Sensor 4031 is sleeved on the outside of cable 5. Sensor 4031 is set as two semicircles. In use, by opening both ends of sensor 4031, the core of cable 5 with the outer sheath stripped can be clamped inside sensor 4031.

[0094] Copper pillar 4033 is installed inside sensor 4031 and is in contact with the outside of cable 5;

[0095] Connecting block 4034 is located at one end of copper pillar 4033;

[0096] Restraint ring 4035 is fitted onto the end of copper pillar 4033 away from connecting block 4034.

[0097] Initially, the sensor 4031 is placed over the cable 5. Since the measurement accuracy of the sensor 4031 is directly related to the cross-sectional area of ​​the magnetic core and the number of coil turns, its inner diameter cannot be easily changed. Therefore, during installation, when the diameter of the cable 5 cannot match the inner diameter of the sensor 4031, multiple sets of copper pillars 4033 are inserted, and the other end of the copper pillars 4033 is attached to the cable 5 by a binding strap. Then, the sensor 4031 is wrapped around the copper pillars 4033 and the cable 5, and the other end of the sensor 4031 is fixed with a nut 4032. This achieves the purpose of expanding the connection diameter of the cable 5, so that the sensor 4031 with a larger inner diameter can also be fixed on the cable 5, realizing the monitoring of cables 5 with different diameters.

[0098] The specific workflow is as follows:

[0099] During installation, the connecting wire 3 is connected to the connector 203. By setting multiple connectors 203, the host 202 can monitor the cables 5 at different positions simultaneously. The dispersing component 206 is used to separate and fix multiple sets of connecting wires 3 that are connected at the same time to avoid tangling. The slide 207 and the adjusting plate 205 can be set on the outside of the protective box 201 to fix and adjust the connecting wires 3 in different directions. Then, an adjusting rod 210 of appropriate length is selected. The adjusting rod 210, the adjusting plate 205 and the sleeve 204 are used to support the part where the connecting wire 3 is connected to the monitoring component 403.

[0100] The sensor 4031 is fitted over the cable 5, and the other end of the sensor 4031 is fixed with a nut 4032. When the diameter of the cable 5 is too thin and the inner diameter of the sensor 4031 is too large, multiple sets of copper pillars 4033 are inserted, and the other end of the copper pillars 4033 is attached to the cable 5 with a binding strap. Then the sensor 4031 is wrapped around the copper pillars 4033 and the cable 5, thereby expanding the connection diameter of the cable 5 and allowing the sensor 4031 with a larger inner diameter to be fixed on the cable 5, so as to realize the monitoring of cables 5 with different diameters.

[0101] After installing the sensor 4031, the two pieces of the housing 4021 are placed over the outside of the sensor 4031 and connected. Additional restraint components such as cable ties can be installed in the slot 4022 to allow the housing 4021 to fit over the exposed part of the cable 5 and tighten the port. Then, the flow guide 4023 is fixed on top of the housing 4021. The airbag 4025 is inflated, causing the airbag 4025 to move the water-absorbing strip 4026 close to the gap of the housing 4021 connection, blocking the connection seam of the housing 4021 and preventing water from seeping through the gap if the housing 4021 becomes loose, thus avoiding direct contact with the cable 5. A humidity sensor 4031 is added inside the water-absorbing strip 4026. When the humidity of the water-absorbing strip 4026 is too high, it can promptly remind the staff that the housing 4021 is leaking water. During long-term use, as the airbag 4025 gradually loses its elasticity, the spring 4024 can also provide support for the water-absorbing strip 4026, enhancing the waterproof and dustproof effect of the housing 4021.

[0102] Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described and explained in the present invention, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. An online detection device for partial discharge in transformers, comprising a base (1), characterized in that, Also includes: The detection mechanism (2) is set on the base (1), the connecting line (3) is installed below the detection mechanism (2), and the mounting mechanism (4) is set at the end of the connecting line (3) away from the detection mechanism (2), the mounting mechanism (4) is sleeved on the outside of the cable (5); The installation mechanism (4) includes an installation block (401) disposed at one end of the connecting line (3), a protective component (402) disposed outside the installation block (401), and a monitoring component (403) installed inside the protective component (402), wherein the monitoring component (403) is sleeved on the outside of the cable (5).

2. The online detection device for partial discharge of transformers according to claim 1, characterized in that: The testing organization (2) includes: A protective box (201) is installed above the base (1); The host (202) is installed inside the protective case (201); Connector (203) is installed below the host (202), and the end of the connector (203) is connected to the connecting line (3).

3. The online detection device for partial discharge of transformers according to claim 2, characterized in that: The testing facility (2) also includes: A sleeve (204) is fitted onto the end of the connecting line (3) away from the protective box (201); A slide rail (207) is installed on the outside of the protective box (201); Adjusting plate (205), which is slidably connected inside slide rail (207), and the lower part of adjusting plate (205) is sleeved with the outside of sleeve (204).

4. The online detection device for partial discharge of transformers according to claim 3, characterized in that: The testing facility (2) also includes: A dispersion component (206) is mounted on the outside of the protective housing (201); The card block (208) is externally slidably connected to the inside of the adjusting plate (205); The first locking rod (209) is inserted inside the locking block (208) and the adjusting plate (205), and the first locking rod (209) fixes the locking block (208).

5. The online detection device for partial discharge of transformers according to claim 4, characterized in that: The testing facility (2) also includes: The second lever (212) is inserted into the slide rail (207) and the adjusting plate (205); A connecting ring (211) is sleeved on the outside of the mounting block (401), and the connecting ring (211) rotates coaxially with the mounting block (401) outside the mounting block (401); Adjusting rod (210), one end of which is mounted on the outside of the locking block (208), and the other end of which is connected to the outside of the connecting ring (211).

6. The online detection device for partial discharge of transformers according to claim 4, characterized in that: The dispersion component (206) includes: A cover (2061) is installed on the outside of the protective box (201); A rotating plate (2062) is rotatably connected to the outside of the protective box (201), and three rotating plates (2062) are arranged side by side; Telescopic rod (2063), the telescopic rod (2063) is installed below the rotating plate (2062), and a connecting sleeve (2064) is installed below the telescopic rod (2063), the connecting sleeve (2064) is used to fix the connecting line (3); A limiting post (2065) is slidably connected inside the cover (2061).

7. The online detection device for partial discharge of transformers according to claim 1, characterized in that: The protective component (402) includes: The housing (4021) is divided into two parts and is fitted on the outside of the cable (5). The inside of the housing (4021) is connected to the outside of the mounting block (401). The two ends of the outside of the housing (4021) are provided with slots (4022). A fairing (4023) is mounted above the housing (4021).

8. The online detection device for partial discharge of transformers according to claim 7, characterized in that: The protective component (402) also includes: An airbag (4025) is installed inside a housing (4021) and is placed at a connection point of the housing (4021); A water-absorbing strip (4026) is installed on the outside of the airbag (4025) and placed inside the connection of the housing (4021); A spring (4024) is installed inside the airbag (4025).

9. The online detection device for partial discharge of transformers according to claim 1, characterized in that: The monitoring component (403) includes: Sensor (4031), the sensor (4031) is rotatably connected to the mounting block (401), the sensor (4031) is divided into two parts and fixed by nuts (4032), the sensor (4031) is sleeved on the outside of the cable (5); A copper pillar (4033) is installed inside the sensor (4031) and is in contact with the outside of the cable (5); A connecting block (4034) is disposed at one end of a copper pillar (4033); A restraint ring (4035) is fitted onto the end of the copper column (4033) away from the connecting block (4034).

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