KR100622573B1 - A disconnector for the surge arrester - Google Patents

Abstract

The present invention relates to an arrester for an arrester, and more particularly, to an arrester for an arrester having excellent performance in a long time large current withstand test, disconnector test, etc. to correspond to the standard of IEC 99-4.

According to the present invention, the temperature delivered to the shell of the powder by the discharge of the gap terminal is not directly transmitted, but is indirectly transmitted. There is an advantage.

Disconnector, lightning arrester

Description

Disconnector for lightning arrester {A DISCONNECTOR FOR THE SURGE ARRESTER}

1 is a cross-sectional view of a conventional arrester disconnector.

Figure 2 is an exploded perspective view of the arrester disconnector according to an embodiment of the present invention.

Figure 3 is a cross-sectional view of the arrester for arrester of Figure 2, in accordance with a preferred embodiment of the present invention.

Figure 4 is an exploded perspective view of the arrester for the arrester according to another embodiment of the present invention.

5 is a cross-sectional view of the arrester for arrester of FIG. 4, according to another preferred embodiment of the present invention.

Figure 6 is a circuit diagram of a lightning arrester disconnector according to a preferred embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

1: housing 2: resistance

3: Gunpowder Jacket 4: Gunpowder Assembly

5: plug 6: gap terminal

20: Body 20a: Upper Body

20b: Lower body 22, 24: Threaded wire

26: fusion line

30: plug 32: thread

40: resistor 42: copper wire

50: powder assembly 52: powder shell

54: thread

60: insulator 70: spring

A: gap terminal

80, 81: terminal 82: resistance

84: powder element

The present invention relates to an arrester for an arrester, and more particularly, to an arrester for an arrester having excellent performance in a long time large current withstand test, disconnector test, etc. to correspond to the standard of IEC 99-4.

Lightning arrester is used as a protection device to block the current by limiting the overvoltage caused by lightning or circuit switching in AC high voltage power system.

The lightning arrester using zinc oxide of this type of arrester is always applied with operating voltage during operation, so leakage current flows, and this leakage current is usually within 1mA. However, if the element of the arrester deteriorates or moisture is penetrated into the arrester housing, and if it exceeds the heat emitted by the arrester, the temperature inside the arrester gradually increases, and when the leakage current exceeds a certain value, the arrester is disconnected from the system. There is a need for a device capable of preventing an arrester accident in advance, and a device for performing this role is a disconnector.

The circuit arrangement of the lightning arrester has a circuit arrangement in which a resistor and a spark gap terminal are connected in parallel between the terminal connected to the terminal of the arrester and the terminal to which the ground wire is electrically connected.

When the leakage current of the arrester flows normally, it flows along the resistor and is connected to the ground wire. When the lightning current such as lightning and surge flows to the arrester, it flows through the spark gap terminal and is connected to the ground wire. When leakage current increases due to deterioration of the lightning arrester and flows over several amperes [A] for a long time, the terminal voltage of the resistor is higher than the terminal discharge voltage of the gap, and the spark gap is operated to explode the disconnector.

An example of the circuit configuration of such a lightning arrester disconnector is shown in Utility Model Registration No. 01572581. In the circuit configuration of the utility model, the powder element and the spark gap terminal are connected in series, and the powder element and the spark gap terminal are configured to be connected in parallel with the resistor.

On the other hand, Patent Registration No. 216650 has a circuit configuration similar to the above-mentioned utility model registration, but has a substantial difference in the configuration thereof. A cross-sectional view of the patent disconnector is shown in FIG.

When the leakage current flows normally, the patented disconnector flows through the plug 5, the resistor 2, and the gunpowder assembly 4, and the resistor in the case of lightning currents such as lightning and surges in the lightning arrester. The current flows through the gap terminal 6, the gunpowder jacket 3, and the gunpowder assembly 4 below the plug 5 without passing through the gun. On the other hand, if the leakage current increases due to deterioration of the arrester, and more than several amperes [A] flow for a long time, the terminal voltage of the resistor is kept higher than the terminal discharge voltage of the gap, and the temperature of the gunpowder jacket is increased by the heat generated by the discharge energy. To explode.

According to the standard of IEC 99-4, the disconnector shall specify that 1) it must withstand high current and long current for a long time, and 2) the arrester must be reliably disconnected from the line during operation of the disconnector. Therefore, when the energy injected into the disconnector is below a certain energy, the disconnector should not be operated. When the energy is above a certain energy, the disconnector must be completely operated and separated. To this end, the following tests are necessary.

1) Long time withstand current test: 20 times with 2ms, 500A (10kA, Class 1 & 2)

2) Large current strength test: 100kA, 4 / 10㎲ large current twice

3) Disconnector disconnection test: lightning arrester at 20A, 200A, 800A

4) Airtight test: After 48 hours in 100 ℃ water, there should be no change in resistance.

5) Strength test: The disconnector shall not operate at a constant energy (energy corresponding to item 1).

However, the conventional disconnector, in particular, the disconnector of Patent No. 216650 has a disadvantage in that it does not satisfy the above standard of IEC 99-4.

In long-term high current withstand testing, a 10kA disconnector shall withstand 500A for 2 ms or more without operation. However, when 500A is applied to a conventional disconnector (Patent Registration No. 216650) for 2ms, all of them have a disadvantage of not being able to withstand more than 20 times.

In addition, there was a disadvantage in that the large current withstand test failed to withstand two large currents.

The present invention has been made to solve the above problems, an object of the present invention is to provide a disconnector having the performance of the disconnector specified in IEC 99-4.

In order to compensate for the shortcomings of the above-mentioned patent No. 216650, that is, to improve the long-term high-current strength and the high-current strength, the gap terminal is not directly formed between the gunpowder shell and the plug one side with the gunpowder, and the gunpowder The gap terminal is formed between the powder assembly surrounding the shell and one side of the plug, so that even if a discharge occurs in the gap terminal, the temperature of the powder shell is indirectly raised rather than directly raising the temperature of the powder shell. It is configured to meet the requirements of the disconnector according to the

The lightning arrester disconnector of the present invention is a non-conducting body, a plug of a conductor inserted into and coupled to an upper portion of the inside of the body, and an electrically connected resistor inserted therein, and a powder that is inserted into and coupled to a lower portion of the inside of the body and is electrically connected to the gunpowder. The embedded gunpowder shell includes a gunpowder assembly of a conductor inserted therein, wherein the resistor is in direct electrical contact with the gunpowder jacket, which is the conductor, and one side of the plug forms a spark gap terminal directly with the gunpowder jacket. Rather, it comprises a powder assembly and spark gap terminal (A) surrounding the powder shell.

According to a preferred embodiment of the present invention, the body is formed integrally, the screw thread formed on the inner upper portion of the body and the screw line formed on the outside of the plug is screwed to the plug and coupled to the inner lower portion of the body The thread formed and the thread formed on the outer side of the gunpowder assembly are screwed and combined with the gunpowder assembly.

According to another preferred embodiment of the present invention, the body is divided into an upper body into which a plug is inserted and a lower body into which the powder assembly is inserted, and the upper body and the lower body are joined by ultrasonic welding.

Preferably, an insulator is formed on the side of the resistor to prevent direct contact with the plug.

Preferably it further comprises a spring for elastically supporting the resistor to ensure good electrical coupling between the resistor and the gunpowder shell.

Hereinafter, the lightning arrester disconnector of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is an exploded perspective view of the arrester disconnector according to an embodiment of the present invention, Figure 3 is a cross-sectional view of the arrester disconnector of FIG.

2 and 3, the lightning arrester disconnector of the present invention largely comprises a non-conductive body 20, a plug 30 of the conductor, gunpowder assembly 50 of the conductor. The insulator body 20 is preferably a thermosetting resin phenol resin, but is not necessarily limited thereto.

The plug 30 is inserted into and coupled to the upper portion of the body. In the plug 30, a resistor 40 electrically connected to the plug 30 is inserted.

On the other hand, the gunpowder jacket 52 electrically connected to the resistor 40 has a gunpowder embedded therein. The gunpowder shell 52 is inserted into the gunpowder assembly 50, and the gunpowder shell 52 and the gunpowder assembly 50 are electrically connected. In the steady state, the leakage current flowing through the plug 30 and the resistor 40 flows to the ground through the gunpowder shell and the gunpowder assembly.

One side of the plug forms a spark gap terminal A with the gunpowder assembly 50 surrounding the gunpowder shell 52. That is, the plug is directly connected to the gunpowder shell in series with the gunpowder assembly to form a spark gap terminal directly with the gunpowder shell. Accordingly, even if discharge occurs at the spark gap terminal, the explosive is prevented from exploding immediately, and the disconnector of the present invention is configured to meet the requirements according to the standard of IEC 99-4.

Body 20 is formed integrally, the threaded line 22 formed on the inner upper portion of the body and the threaded line 32 formed on the outside of the plug 30 is screwed and coupled to the plug 30, the body of A screw thread 24 formed at an inner lower portion thereof and a screw thread 54 formed at an outer side of the gunpowder assembly 50 are screwed to be coupled to the gunpowder assembly 50.

 On the other hand, the insulator 60 is formed on the side of the resistor 40 in the plug 30 to prevent direct contact with the plug 30, and the electrical coupling between the resistor 40 and the gunpowder shell 52 is good. Spring 70 is formed to elastically support the resistor 40 to be made.

The space between the plug and the body, the body and the gunpowder is sealed with adhesive to prevent moisture from penetrating into the disconnector. A gap is formed between the plug and the body to form a space for filling the adhesive.

The operating principle of the disconnector of the present invention will be described in more detail.

The arrester is connected to earth via the disconnector. If the arrester's performance is abnormal, the disconnector is disconnected and the arrester is disconnected from ground.

In the disconnector of the present invention, a spark gap terminal connected in parallel with a resistor is formed between one side of the plug and the powder assembly. Inside the gunpowder assembly, the gunpowder shell with gunpowder is connected in series. When the spark gap terminal is operated and discharge (arc) occurs for a certain time, the gunpowder jacket temperature rises to ignite the gunpowder and cause an explosion. . In this case, the plastic body explodes due to an increase in the internal pressure of the disconnector due to the explosive explosion, which disconnects the arrester connected to the ground through the disconnector from the system. It should be noted that the spark gap terminals are connected in series with a predetermined distance to form the spark gap terminals directly with the gunpowder shell, unlike the prior art. Therefore, even if a discharge occurs at the spark gap terminal (between one side of the plug and the gun powder assembly), the temperature of the gunpowder jacket is indirectly raised to meet the requirements of the long time current and the high current load specified in IEC 99-4. .

In the normal operation of the arrester (when the leakage current is normal), the spark gap does not operate due to the current flowing through the resistor.In case of the abnormal operation of the arrester (in case the leakage current continues to increase), the spark gap operates. It increases the temperature of the gunpowder connected in series with the spark gap. If the gun temperature is higher than the ignition temperature, the gunpowder explodes. At this time, even if the spark gap terminal operates, if the discharge energy delivered to the gunpowder is less than the energy required for the ignition of the gunpowder, the gunpowder does not explode. In this case, it is regarded as a normal state.

In more detail, the operation area of the disconnector is described in detail.

1) Spark gap does not work: It is the area where the terminal contact voltage of the resistor connected in parallel to the gap terminal is less than the discharge voltage of the spark gap terminal, and minute leakage current (1mA or less) flows normally in the arrester.

2) When the spark gap terminal operates but the disconnector does not operate (explodes): When the discharge energy of the spark delivered to the gunpowder is less than the explosive energy of the gunpowder, lightning currents such as lightning and surge in the arrester It penetrates the ground through the spark gap terminal. At this time, the disconnector should not operate because it should operate normally. That is, it should not explode.

3) When the disconnector is operated (i.e., exploded): When the leakage current increases due to deterioration of the arrester, and a leakage current of several amperes [A] flows for a long time, the terminal voltage of the resistor is the discharge voltage of the gap terminal. It becomes higher and discharge occurs in the spark gap and when a certain time passes, the ignition temperature of the gun powder is reached and the gun powder is exploded and the disconnector is operated.

4 is an exploded perspective view of a lightning arrester disconnector according to another exemplary embodiment of the present invention, and FIG. 5 is a cross-sectional view of the arrester disconnector of FIG. 4.

4 and 5 is separated from the disconnector of FIGS. 2 and 3, the body is separated into two parts (20a, 20b). The plug 30 is inserted into the upper body 20a, and the upper body 20a, which is an insulator, is coupled to the plug 30 by plastic injection. Then, a resistor 40, an insulator 60, and a spring 70 are inserted into the plug. On the other hand, the gunpowder assembly 50 is inserted into the lower body 20b, which also forms a non-conductive lower body 20b coupled to the gunpowder assembly 50 by plastic injection. Then, the gunpowder shell 52 containing the gunpowder is inserted into the gunpowder assembly.

The upper body 20a and the lower body 20b are joined by ultrasonic welding, and an identification code 26 denotes a welding line. By melting the plastic of the welding line by ultrasonic welding, the upper body and the lower body are tightly coupled without a gap. Accordingly, there is an advantage that it is not necessary to fill the gap using an adhesive separately.

6 is a circuit diagram of a lightning arrester disconnector according to a preferred embodiment of the present invention.

At both ends, a terminal 80 connected to the terminal of the arrester and a terminal 81 connected to the ground wire are electrically connected. A resistor 82 and a gap terminal A are connected in parallel between the terminals 80 and 81, and the gunpowder element 84 is connected in series to the gap terminal A and the resistor 82. have.

The configuration of the circuit as described above is the same as the conventional one in that the resistor 82 and the spark gap terminal A are connected in parallel, but the gunpowder element 84 is connected in series with respect to the resistor and the spark gap terminal A. In terms of connection, it has a circuit configuration different from that of a conventional disconnector.

Example

A 10kA disconnector having the shape shown in FIG. 2 was fabricated and the characteristics test of the disconnector was performed. All tests were carried out, ie, long-time high current withstand test, high current withstand test, hermetic test, proof test and finally disconnector disconnect test. The result was that all of the requirements of IEC 99-4 were met.

The foregoing has outlined rather broadly the features and technical advantages of the present invention in order to better understand the claims of the invention which will be described later. Additional features and advantages constituting the claims of the present invention will be described below. It should be appreciated by those skilled in the art that the conception and specific embodiments of the invention disclosed may be readily used as a basis for designing or modifying other structures for carrying out similar purposes to the invention.

In addition, the inventive concepts and embodiments disclosed herein may be used by those skilled in the art as a basis for modifying or designing other structures for carrying out the same purposes of the present invention. In addition, such modifications or altered equivalent structures by those skilled in the art may be variously changed, substituted and changed without departing from the spirit or scope of the invention described in the claims.

As described above, in the present invention, the temperature transmitted to the shell of the powder by the discharge of the gap terminal is not directly transmitted, but is indirectly transmitted so that the long-term high current strength test and the disconnection tester correspond to the standard of IEC 99-4. It has the advantage of having such performance.

Claims (5)

In the disconnector for the arrester, Non-chain body (20), The plug 30 of the conductor is inserted into the upper portion of the inside of the body and coupled, the resistor 40 is electrically connected therein, Inserted and coupled to the lower portion of the inside of the body, the gunpowder shell 52 is embedded with an electrically connected gunpowder includes a gunpowder assembly 50 of the conductor inserted therein, The resistor 40 is in direct electrical contact with the gunpowder jacket 52, which is the conductor, and one side of the plug does not form a spark gap terminal directly with the gunpowder jacket, but rather a gunpowder assembly 50 surrounding the gunpowder jacket 52. And a spark gap terminal (A). The method of claim 1, The body 20 is formed integrally, The screw thread 22 formed on the inner upper portion of the body and the screw thread 32 formed on the outer side of the plug 30 are screwed to engage the plug 30. The arrester for an arrester, characterized in that the screw thread formed on the inner lower portion of the body and the thread thread formed on the outer side of the gunpowder assembly (50) are screwed and combined with the gunpowder assembly (50). The method of claim 1, The body is divided into an upper body 20a into which a plug is inserted and a lower body 20b into which the gunpowder assembly is inserted, and the upper body 20a and the lower body 20b are combined by ultrasonic welding. Disconnector for arrester. The method according to any one of claims 1 to 3, Arrestor for an arrester, characterized in that the insulator (60) is formed on the side of the resistor (40) to prevent direct contact with the plug (30). The method according to any one of claims 1 to 3, And a spring (70) elastically supporting the resistor (40) so that the electrical coupling between the resistor (40) and the gunpowder jacket (52) is satisfactorily performed.

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