CN2200882Y

CN2200882Y - Movement counter for lightning arrester

Info

Publication number: CN2200882Y
Application number: CN 94210019
Authority: CN
Inventors: 姚巧玲
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-04-22
Filing date: 1994-04-22
Publication date: 1995-06-14
Anticipated expiration: 2004-04-22

Abstract

The utility model belongs to a movement counter for a lightning arrester in the technical field of electrical engineering. The utility model is characterized in that the utility model comprises a non-linear resistance chip (1) which is a pressure taking component, or a purpose-made current transformer (6), a current limiting element (2), an energy-storage capacitor (3) and a number type electromagnetic counter (4), wherein, the non-linear resistance chip comprises a carborundum valve plate or a zinc-oxide valve plate. The movement counter for a lightning arrester can record the acting frequency of the lightning arrester under the conditions of vibration and no reduction of the overvoltage protecting capability of the lightning arrester, and the utility model can be also provided with a current meter to monitor the ageing of the lightning arrester inside.

Description

Movement counter for lightning arrester

The utility model belongs to the electrical engineering technical field, is about the utility model of electric power system lightning arrester with the operation indicator device aspect.

The lightning arrester operation counter is by carborundum valve block sampling (voltage) at present, the rectification of semiconductor silicon bridge, the capacitor energy storage, pointer-type message register indication lightning arrester action frequency, several parts such as glass outer cover sealing constitute, according to circumstances tool industry standard JB2440-91 " lightning arrester discharge counter ".The shortcoming of existing product mainly contains: resistance to shock is poor, even there is when gentlier vibrating pointer to beat, thereby misregister; The carborundum resistor disc is less by current capacity, has improved residual voltage, has promptly reduced the protection of arrester ability; Glass outer cover bad mechanical strength etc.

The purpose of this utility model is can work under vibration condition in order to provide a kind of, does not reduce the lightning arrester operation counter of lightning arrester overvoltage protection ability.

Fig. 1 is the structure chart of the utility model of pressure parts when being non-linear resistor.Of the present utility modelly be characterised in that it is to be made of pressure parts non-linear resistor 1, current limiting element 2, energy storage capacitor 3 and number formula message register 4.Non-linear resistor 1 can be made of carborundum valve block or zinc oxide valve plate.Current limiting element 2 one ends and non-linear resistor 1 high-pressure side are electrically connected, and the other end and energy storage capacitor 3 high-pressure sides are electrically connected.The other end ground connection of non-linear resistor 1 and energy storage capacitor 3, number formula message register 4 is connected in parallel with energy storage capacitor 3.All building blocks are hermetically enclosed by metal cap 5.

Fig. 2 is the utility model electrical wiring schematic diagrams of pressure parts when being non-linear resistor 1.

The utility model electrical wiring schematic diagram of Fig. 3 when to be the pressure parts by special current transformer 6 replace non-linear resistors 1.Special current transformer core has small cross sections, makes its primary side current surpass 100A and promptly enters the magnetic saturation district.

Above-mentioned two kinds of lightning arrester operation counters can also interiorly be adorned ammeter with the record lightning arrester electric current that flows through lightning arrester in service, and Fig. 4 is the utility model electrical wiring schematic diagram of belt current table 7, it is characterized in that being parallel with ammeter 7 with non-linear resistor 1.Ammeter 7 itself has bridge-type rectifier, and

resistance

8,9 and voltage stabilizing didoe 10 are protective devices of ammeter 7, and ammeter 7 goes to pot when preventing overcurrent by operation counter non-linear resistor 1.

Equally, also can be in parallel with special current transformer 6 with ammeter 7.

The utility model operation counter has been compared following advantage with present with the lightning arrester operation counter:

1. improve resistance to shock, prevented misoperation.

The number formula message register 4 that the utility model adopts is to move the numeral of beating by the electromagnetic force driven wheel, is not subjected to mechanical oscillation and electromagnetic interference effect, and indication has accurately prevented misoperation.

2. can not reduce the protection of arrester ability when adopting zinc oxide resistance sheet 1 or special current transformer 6 to make the pressure parts.

Only adopt the sampling of carborundum resistor disc with lightning arrester action register at present, the utility model also adopts zinc oxide resistance sheet 1 and special current transformer 6 to make the pressure parts and since they pass through the current capacity height, can not reduce the protective capability of lightning arrester.Special current transformer 6 magnetic cores have small cross sections, enter the magnetic saturation district when making its primary side current surpass 100A, make that secondary side current increased seldom when primary side current was very big, avoid producing too high voltage on the energy storage capacitor 3, cause message register 4 to damage.

3. reduced the damage of lightning arrester operation counter under overcurrent.

At present after the rectification of silicon bridge rectifier cell, give energy storage capacitor and pointer message register with the voltage at pressure element two ends in the lightning arrester operation counter.Because forward voltage drop is very little after the conducting of silicon bridge rectifier cell, when the electric current that flows through is big, can on energy storage capacitor, produce high voltage, cause message register to damage.The utility model adopts current limiting element 2 to replace above-mentioned silicon bridge rectifier cell can overcome this shortcoming.The voltage-current characteristic of current limiting element 2 as shown in Figure 5.When the voltage at pressure parts 1 or 6 two ends surpasses current limiting element 2 conducting voltage, electric current flows through current limiting element 2, and, when the voltage on the capacitor 3 surpasses the operation voltage of message register 4, order about message register 4 numeral of beating to energy storage capacitor 3 charging.Because the voltage-current characteristic (Fig. 5) of current limiting element 2 is to origin of coordinates symmetry, thereby its conducting voltage and lightning current polarity are irrelevant, in addition, because the lightning current polarity that occurs in the short time in same place can not change, thereby can not need this electric current is carried out rectification, message register 4 also can move, and this is the reason that current limiting element 2 can replace existing silicon bridge rectifier cell.Current limiting element 2 compares with the silicon bridge rectifier cell that its advantage is can current limliting, this from Fig. 5 also as can be seen, when promptly electric current surpasses certain value, current limiting element 2 resistance increase, stop electric current to continue to raise, thereby electric current is limited in the certain limit, has avoided the message register damage.

4. reduced cost.

This mainly is owing to adopt current limiting element 2 to replace traditional semiconductor silicon bridge rectifier cell caused.

5. the lightning arrester operation counter that has ammeter 7 also can be done the aging monitoring of lightning arrester simultaneously.

Lightning arrester is aging mainly to be reflected in the size of current that flows through valve block at ordinary times, and ammeter 7 has been indicated this size of current.

Fig. 1 is that the pressure parts are non-linear resistor, the lightning arrester operation counter structure chart of belt current table not.

Fig. 2 is an operation counter electrical wiring schematic diagram shown in Figure 1.

Fig. 3 is that the pressure parts are special current transformer, the lightning arrester operation counter electrical wiring schematic diagram of belt current table not.

Fig. 4 right and wrong linear resistance sheet is parallel with the lightning arrester operation counter electrical wiring schematic diagram of ammeter.

Fig. 5 is the voltage-current characteristic of current limiting element.

Fig. 1 also is that the pressure parts are non-linear resistor 1, the utility model embodiment of belt current table not.Wherein the overvoltage current wave is a high-field electrode by T type screw 11(), install in base plate 14 inflow places through non-linear resistor 1, metal fixed head 12, plain conductor 13 and metal.Simultaneously, an end of current limiting element 2 links to each other through the high-pressure side of plain conductor 15 with non-linear resistor 1, and its other end is connected in parallel through plain conductor 16 and energy storage capacitor 3, and the ground end of these two is also installed base plate 14 with metal and is connected.T type screw 11 and metal are installed 14 of base plates with insulator 17 and 18 insulation of insulation fixed head.Non-linear resistor 1 is fixed between metal fixed head 12 and the insulation fixed head 18 by bolt, nut 19,20.Energy storage capacitor 3 and message register 4 also are fixed on the metal fixed head 12 by bolt, nut respectively.For guaranteeing to be electrically connected reliably, plain conductor 13,15,16 generally adopts welding to the connection of other part.All elements are all hermetically enclosed in metal cap 5 inside by sealing ring.For observing counter 4 action numerals, glass 21 is equipped with in metal cap 5 fronts.

Claims

1, the electric power system lightning arrester uses operation counter by pressure parts carborundum resistor disc, the silicon bridge rectification part, energy storage capacitor and pointer message register are formed, of the present utility modelly be characterised in that it is by pressure parts non-linear resistor (1), current limiting element (2), energy storage capacitor (3) and number formula message register (4) constitute, non-linear resistor (1) can be made of carborundum valve block or zinc oxide valve plate, current limiting element (2) one ends and non-linear resistor (1) high-pressure side are electrically connected, the other end and energy storage capacitor (3) high-pressure side is electrically connected, the other end ground connection of non-linear resistor (1) and energy storage capacitor (3), number formula message register (4) is connected in parallel with energy storage capacitor (3), and all building blocks are hermetically enclosed by metal cap (5).

2, press the lightning arrester operation counter of claim 1, it is characterized in that replacing pressure parts non-linear resistors (1) with the special current transformers of pressure parts (6), special current transformer core has small cross sections, enters the magnetic saturation district when making its primary side current surpass 100A.

3, by claim 1 or 2 described lightning arrester operation counters, it is characterized in that being parallel with ammeter (7) with pressure parts non-linear resistor (1) or special current transformer (6).