CN210074766U

CN210074766U - Six-phase overvoltage protector

Info

Publication number: CN210074766U
Application number: CN201920957024.4U
Authority: CN
Inventors: 孔祥霖; 王帅
Original assignee: Chint Electric Co Ltd
Current assignee: Chint Electric Co Ltd
Priority date: 2019-06-24
Filing date: 2019-06-24
Publication date: 2020-02-14
Anticipated expiration: 2029-06-24

Abstract

The utility model discloses a six looks overvoltage protector, a serial communication port, which comprises a housin, be equipped with three binding post and the three ground terminal who is connected with three earth connection respectively that is connected with the three-phase wiring respectively on the casing, be equipped with three alternate protection specialized unit and three earth protection specialized unit in the casing, be connected with an alternate protection specialized unit respectively through the wire between two arbitrary binding posts, every binding post is connected with the one end of a earth protection specialized unit through the wire respectively, three earth protection specialized unit's the other end is connected with three ground terminal on the casing respectively. The utility model discloses a through change original ground terminal into three ground terminal, can detect it through multimeter and high frequency direct current generator, whether the resistance value that detects ground connection gear or whether have that the pressure sensitivity can be clear detect out this product for six looks overvoltage protection device still for the four-phase overvoltage protection device who pretends to be impersonant.

Description

Six-phase overvoltage protector

Technical Field

The utility model relates to a six-phase overvoltage protector belongs to electrical equipment technical field.

Background

In order to prevent the insulation of various electric equipment of a medium-voltage system from being damaged by operation overvoltage generated by the on-off of a switch, a combined overvoltage protector with a lightning arrester unit (MOA) as a basic structure is produced. The overvoltage protector mainly prevents operation overvoltage and assists lightning protection, adopts a four-phase structure (as shown in figure 3), and has an interphase protection function. Industry standards have guided some guidance on their use, such as JB/T10496 and JB/T10609.

However, this connection has some disadvantages. In order to realize the interphase protection function, the design of the conduction voltage parameters of the three-phase MOA unit faces two difficulties. The design conduction voltage is too high, so that the effect of phase-to-phase protection is greatly lost, the design conduction voltage is too low, the three-phase MOA unit can completely bear phase voltage during normal operation, the zinc oxide valve plate has high charge rate and is quick to age, and the service life is greatly reduced. Particularly, when three phases are unbalanced (such as single-phase earth fault of a system), the voltage is even further greatly increased, so that the three-phase MOA unit of the four-phase overvoltage protector is rapidly aged and broken down to form an accident.

Therefore, in recent years, many people look back to the traditional six-phase MOA protection design, but the six phases are assembled into a shell by various molding processes, and the shell is called a six-phase overvoltage protector (as shown in fig. 2).

The overvoltage protector adopts six completely separated MOA units to respectively realize phase-to-phase protection and ground protection. The MOA1-MOA3 are three inter-phase protection units, the MOA4-MOA6 are three phase ground protection units, the work of all the units is not interfered with each other, namely the MOA units of opposite phases are completely separated from the MOA units of opposite phases, and the most traditional lightning arrester protection switching mode is returned. But traditionally, six single-phase lightning arresters are used for external connection, and the six-phase overvoltage protector is made into a whole and is grounded through a whole grounding terminal.

The connection mode can effectively avoid the problem that the conduction voltage parameter design of a three-phase MOA unit in the four-phase overvoltage protector faces two difficulties, greatly improves the stability of equipment and is well received by users.

However, the design has a serious acceptance test problem and is very easy to be simulated by the traditional four-phase overvoltage protector. Comparing the two internal configurations of fig. 2 and 3, the exposed terminals of the housing are four (A, B, C three-phase and ground terminals), and the two types of products cannot be distinguished from each other in appearance.

More seriously, the conventional electrical performance test cannot distinguish the two products. Because the interphase parameter and the corresponding ground parameter of the four-phase overvoltage protector are completely consistent with those of the six-phase overvoltage protector, a user cannot effectively distinguish the authenticity of the two products through a normal acceptance test on the premise of not disassembling the products.

This design neglect creates a confusion in the market place. Many manufacturers use the point to adopt various edge wiping propaganda, mix up and listen, and use the objective condition that users cannot distinguish true from false through an acceptance test, and actually use the four-phase overvoltage protector to falsely serve as a six-phase overvoltage protector for sale.

Because the cost of the four-phase overvoltage protector is obviously lower than that of a regular six-phase overvoltage protector, the method of falsely and truly striking the popularization effect and market public praise of real goods. The real goods are not sold in the false goods in cost, and various accidents caused by the false goods are also counted on the real goods, so that serious confusion is caused.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: the problem of how to avoid six looks overvoltage protector by four looks overvoltage protector counterfeit is solved.

In order to solve the technical problem, the technical scheme of the utility model provides a six looks overvoltage protection device, a serial communication port, which comprises a housin, be equipped with three binding post and the three ground terminal who is connected with three earth connection respectively of being connected with the three-phase wiring on the casing respectively, be equipped with three alternate protection specialized unit and three ground protection specialized unit in the casing, be connected with an alternate protection specialized unit respectively through the wire between two arbitrary binding post, every binding post is connected with a one end of protecting specialized unit to ground through the wire respectively, three ground terminal on the casing is connected respectively to the other end of protecting specialized unit to ground.

The utility model discloses a through change original ground terminal into three ground terminal, can detect it through multimeter and high frequency direct current generator, whether the resistance value that detects ground connection gear or whether have that the pressure sensitivity can be clear detect out this product for six looks overvoltage protection device still for the four-phase overvoltage protection device who pretends to be impersonant.

Drawings

Fig. 1 is a schematic diagram of a six-phase overvoltage protector;

fig. 2 is a schematic diagram of a conventional six-phase overvoltage protector;

fig. 3 is a schematic diagram of a conventional four-phase overvoltage protector;

FIG. 4 is a counterfeit schematic diagram of a conventional four-phase overvoltage protector (one);

fig. 5 is a counterfeit schematic diagram (two) of a conventional four-phase overvoltage protector.

Detailed Description

In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.

The utility model relates to a six looks overvoltage protection device installs between A, B, C three-phase and ground, as shown in FIG. 1, it includes the casing, and the casing is inside to contain six MOA units, and wherein MOA1-MOA3 unit is the special unit of alternate protection, is equivalent to three alternate arresters. The MOA4-MOA6 unit is a special unit for protecting the ground, and is equivalent to three ground-to-ground arresters.

The shell is provided with three wiring terminals connected with three-phase wiring and three grounding terminals connected with three grounding wires, three inter-phase protection special units and three ground protection special units are arranged in the shell, an inter-phase protection special unit is connected between any two wiring terminals through a wire, each wiring terminal is connected with one end of one ground protection special unit through a wire, and the other ends of the three ground protection special units are connected with the three grounding terminals on the shell respectively.

The utility model discloses a six terminal connections of casing outside adoption, draw forth three ground terminal in the base of casing, respectively with three ground connection MOA unit connection, a ground terminal and MOA4 unit connection promptly, another ground terminal and MOA5 unit connection, third ground terminal and MOA6 unit connection. When the grounding device is installed and used, one grounding wire is used for simultaneously connecting three grounding terminals, and the reliable grounding use of the whole device can be realized. Because six looks overvoltage protector have three ground connection MOA units, three earth terminal have the pressure sensitive characteristic between two liang, can pass through various test equipment test its pressure sensitive characteristic. If a universal meter is used for measuring the resistance to be a high resistance value, a direct current generator can be used for accurately measuring direct current reference voltage and the like. Even if three pseudo-grounding terminals are led out, parameters between the terminals are completely different, and a user can effectively prevent counterfeiting through simple tests.

Different completely with traditional four-phase overvoltage protector, the utility model discloses the MOA unit of realization protection and protection to ground does not have publicly, can effectively solve three-phase MOA unit break-over voltage parameter design and face the dilemma problem, improves the reliability of protection and the stability of product self greatly.

Take one ground terminal and another ground terminal as an example:

one ground terminal and the other ground terminal are not conducted, and the MOA4 unit, the MOA5 unit and the series-parallel connection structure of three interphase protection MOA units are arranged.

Because five MOA units have pressure-sensitive characteristics, one grounding terminal and the other grounding terminal are not conducted by a simple multimeter test. Furthermore, a direct current reference voltage tester for testing the parameters of the conventional piezoresistor is adopted, and accurate voltage-sensitive conversion voltage can be tested.

In the case of three ground terminals leading out, it is impossible to impersonate a six-phase overvoltage protector by continuing to use a conventional four-phase overvoltage protector, as shown in fig. 4 and 5.

In the impersonation mode of fig. 4, since the four-phase overvoltage protector has only one grounding phase, three true grounding terminals can only be conducted. When a multimeter is used for testing, the alarm can be directly conducted at the grounding gear. The resistance value is also shown as 0. Through the simple test, the user can accurately judge that the product is a product which uses four phases to pretend to be six phases.

In the impersonation mode of fig. 5, two ends of the true ground terminal are two false ground terminals, and no wiring is arranged inside. When the universal meter is used for testing, the three grounding terminals are not conducted in pairs, and certain concealment is achieved. However, if a direct current reference voltage tester for testing the parameters of the conventional piezoresistor is further adopted, the piezoresistor cannot be subjected to pressure-sensitive transformation due to no pressure sensitivity, and the piezoresistor can be shaped. If the product is a gapped product, the direct current test is changed into a power frequency discharge voltage test, and the anti-counterfeiting principle is still established.

Correspondingly, a voltage test parameter between any two grounding terminals can be added in a six-phase product delivery test. With the parameter, a user can carry out simplest comparison, and the disorder phase of the four-phase overvoltage protector serving as the six-phase overvoltage protector is completely avoided.

Claims

1. The utility model provides a six looks overvoltage protection ware, its characterized in that, which comprises a housin, be equipped with three binding post and three ground terminal who is connected with three earth connection respectively of being connected with the three-phase wiring on the casing, be equipped with three special unit of alternate protection and three special unit of protection to ground in the casing, be connected with a special unit of alternate protection respectively through the wire between arbitrary two binding post, every binding post is connected with the one end of a special unit of protection to ground respectively through the wire, three other end of the special unit of protection to ground is connected with three ground terminal on the casing respectively.