CN2379809Y

CN2379809Y - On-line monitoring instrument for lightning arrester

Info

Publication number: CN2379809Y
Application number: CN 99236290
Authority: CN
Inventors: 肖国斌
Original assignee: HUASHENG LIGHTING PROTECTOR INDUSTRIAL Co Ltd GUANGZHOU CITY
Current assignee: HUASHENG LIGHTING PROTECTOR INDUSTRIAL Co Ltd GUANGZHOU CITY
Priority date: 1999-06-09
Filing date: 1999-06-09
Publication date: 2000-05-24
Anticipated expiration: 2009-06-09

Abstract

The utility model relates to an on-line monitoring instrument for lightning arrester, which is composed of a screw cap, a lug, a porcelain sleeve, a flange, a steel sleeve, a monitoring plate, a capacitor, a bottom cover plate, a protector, a measuring range indicating lamp, a dial plate, an electromagnetic counter. The connection relationship is that the screw cap is in screw connected with the lug, the porcelain sleeve and the bottom cover plate in sequence; the lug is connected with the electricity of the lightning arrester; the steel sleeve is hermetically clamped with the flange; the monitoring plate, the capacitor and the protector are arranged on an inner support bracket of the steel sleeve; the indicating lamp and the electromagnetic counter are arranged on the dial plate of a panel. A circuit is formed by that an I/V converter, a current indication return circuit, a measuring range transition return circuit, a protection return circuit and an action counting return circuit are connected by respective signal wire electricity. The utility model can ensure monitoring function, measuring accuracy and definition, and has the advantages of compact structure and high reliability.

Description

Lightning arrester on-line monitoring instrument

The utility model is a lightning arrester on-line monitoring instrument, belongs to lightning arrester support equipment technology.

Existing its simple action principle of lightning arrester on-line monitoring instrument is: leakage current of an arrester is piled rectification through rectifier bridge, flows through milliammeter behind the capacitor filtering and shows; The lightning arrester action current at first to the capacitor charging, is discharged to message register by capacitor after the rectification of rectifier bridge heap then, makes the message register action once.But there is following shortcoming and defect in it: the indication of (1) leakage current list range.Be about 1mA under the leakage current of an arrester normal condition, should be the choosing table rule in 1/3～2/3 scope of range by indicated value, the range of reometer should be 1.5～3mA.But when the lightning arrester performance degradation, leakage current will constantly rise, and during the rainy day after getting dirty in the lightning arrester surface, surface leakage can increase sharply, to making the reometer can't the indicator current value because of the leakage current values outrange, also thereby lost the monitoring effect; If select the reometer of wide range to solve problem, then the pointing accuracy of the leakage current under the normal condition descends, and because of the on-line monitoring instrument links to each other with the lightning arrester lower end and is installed near the lightning arrester lower end, height 1.8m overhead is if improve precision, then need fine and closely woven scale, power station member on duty is when the inspection reading like this, and because of the distance of people and table is difficult to clear reading, you can't have both at the same time for precision and sharpness: when (2) lightning arrester moves, ammeter pointer is played table, even the bending pointer.During the lightning arrester action, dash current is after the capacitor charging, capacitor C, message register (L, R) are formed L, C, the discharge of R loop, the discharge current that forms is about 10/30ms, amplitude reaches the dash current of 100mA and makes the message register action, also makes ammeter pointer hit table simultaneously, makes reometer impaired to a certain extent easily, influence measuring accuracy, even indicator bending and can't using.

The purpose of this utility model is exactly to have lightning arrester on-line monitoring instrument now in order to overcome and to solve, leakage current increases to reometer and can't indicate when get dirty in lightning arrester performance degradation or surface, lose the monitoring effect, even ammeter pointer is hit table, indicator bending and can't using, and shortcoming and the problem of selecting the wide range ammeter to have precision and sharpness can not get both etc., a kind of reometer range that can enlarge of research and design, make reometer can make indication in all cases, guarantee the monitoring effect, and can guarantee sharpness and measuring accuracy, when moving, lightning arrester is not hit simultaneously, the lightning arrester on-line monitoring instrument that operational reliability is high.

The utility model is realized by following technical proposals: the structural representation of lightning arrester on-line monitoring instrument such as Fig. 1～shown in Figure 2, its circuit block diagram as shown in Figure 3, its circuit theory diagrams are as shown in Figure 4.It is by nut 1, lug plate 2, insulator 3, flange 4, stainless steel cage 5, control and testing board 6, capacitor 7, protector 8, range conversion pilot lamp 10, reometer dial plate 11, message register 12, bottom plate 13 connects and composes jointly, its mutual alignment and interconnected relationship are: nut 1 is by screw thread difference order and lug plate 2, insulator 3, flange 4 screws connection, lug plate 2 is electrically connected mutually with monitored lightning arrester lower end, and thereby flange 4 ground connection are realized that this on-line monitoring instrument and monitored lightning arrester are in series and are connected, stainless steel cage 5 by O-ring seal and flange 4 clamp the sealing affixed, on the control and testing board by soldering and the affixed circuit board that is equipped with of securing member, reometer and message register device, control and testing board 6 is installed on stainless steel cage 5 inner supports, the capacitor 7 of action circuit and the protector 8 that is made of protection gap Bx and piezoresister all are loaded on the stainless steel cage inner support, be electrically connected mutually by lead between them, nameplate 9 is adhered in the preposition glass vision panel of monitor, range conversion pilot lamp is installed on the reometer dial plate, reometer dial plate 11 is loaded on the stainless steel cage top panel of monitor, and message register 12 places the reometer dial plate to offer in the window; Wherein: the circuit on the control and testing board; the circuit that is this monitor is by comprising the I/V converter; electric current indicating value loop; the current measurement circuit in range conversion loop; the protection loop; the action counting circuit connects and composes jointly; its interconnected relationship is: after protection loop and current measurement circuit are in parallel and are connected again with move counting circuit and be in series and be connected; lightning arrester by lightning arrester electric current pipeline respectively with protection loop and current measurement circuit in the I/V converter be electrically connected mutually; the I/V converter by I/V converted output signal line respectively with the protection loop; electric current indicating value loop is electrically connected mutually; electric current indicating value loop is electrically connected with range conversion loop mutually by its output signal line; range conversion loop by its output signal line respectively with electric current indicating value loop; the action counting circuit is electrically connected mutually, and the action counting circuit is electrically connected with lightning arrester mutually by its output signal line: wherein the I/V converter is by cement resistor device R ₁, rectifier bridge heap (QL ₁) D ₁～D ₄, voltage stabilizing diode DW ₁～DW ₄Be electrically connected formation jointly; Electric current indicating value loop is by resistance R ₃～R ₁₀, potentiometer RW ₁, mA reometer, superbright light emitting diode DG ₁～DG ₄Be in parallel and connect and compose; Range conversion loop is by voltage stabilizing diode DW ₅, relay J ₁, capacitor C ₁～C ₃, resistance R ₁₁, potentiometer R _W2Be in parallel and connect and compose; The protection loop is made of protection gap BX assembly; Action counting circuit resistance R ₂, zinc oxide nonlinear resistance slice R _MY1～R _MY2, zinc oxide varistor R _MY3, rectifier bridge heap (QL ₂) D ₅～D ₈, capacitor C ₄, message register DJ is electrically connected formation jointly.

The principle of work of this lightning arrester on-line monitoring instrument is as follows: during Analyse of Reject-acting Arrester, its leakage current is the mA level, protection gap BX can not puncture, the leakage current metering circuit of all flowing through, because of the normal leakage electric current is about 1mA, should be by indicated value in the choosing table principle in 1/3～2/3 range ability, choosing the reometer range is 2.5mA, and be minimum scale with 0.1mA, this is the clear and accurate based measurement of indication; When leakage current is not more than 2.5mA, DG ₁(the ruddiness pipe that watch face is installed) do not work the direct reading of reometer; When the super 2.5mA of electric current, electronic relay J ₁Action, extended four times of reometer range (can appoint and establish), DG ₁Bright, current value is 4 * meter reading, has realized the automatic conversion of range, and has satisfied the clear indication of electric current, accurately measurement, and can appoint and establish upper current limit, and reometer under any circumstance can both accurately be monitored; During the lightning arrester action, produce the dash current of amplitude kA level waveform μ S level, electric current begins the flow directional detection circuit, but the dash current amplitude rises to certain value (set up and be the protective current higher limit), then because of resistor R ₁Pressure drop increase to protection gap Bx voltage breakdown and make protection gap Bx puncture short, make dash current without metering circuit, protected reometer that it is not hit, improved reliability of operation; During the lightning arrester action, dash current is at first to C ₂Charging is then by capacitor C ₂, message register J ₂L, the C that (L, R) forms, the discharge of R loop, produce the dash current that the dash current amplitude reaches 100mA, the about 10/30mS of waveform, thereby make message register action counting, range conversion pilot lamp is housed on the on-line monitoring instrument panel and can read lightning arrester running current value and the lightning arrester action frequency; The telemetry circuit action principle of this monitor is as follows: when electric current exceeded switching current and sets limit value (the direct-reading range of reometer), range conversion loop provides control signal, and to make the automatic range extension in electric current indicating value loop be n * table direct-reading number (n can be any number in theory); When lightning arrester action dash current rises to protective current setting limit value; provide control signal by the I/V converter, make the effect of protection loop, thus the short circuit current measurement loop; reached the purpose in protective current measurement loop: when lightning arrester moves, by action counting circuit counting.

The utility model is compared with existing lightning arrester on-line monitoring instrument, have following advantage and beneficial effect: (1) the utility model has realized that range changes automatically: adopt the 2.5mA table, current value direct-reading before the range conversion, behind the super 2.5mA, range is changed automatically, and range is enlarged 4 times, current value is 4 * meter reading, gamut is 0～10mA, and can clear indication, accurately measure, the selection that has overcome existing monitor reometer range and clear indication be the contradiction of measurement accurately; (2) the utility model has been realized the protection to reometer, make it avoid the impact damage of lightning arrester action dash current, improved reliability of operation, seriously reduced meter accuracy even out of use disadvantage thereby overcome existing monitor ammeter pointer deformation bending when suffering rush of current; Above-mentioned two utility functions by the test confirm that receive great acclaim, this also is the function that the user expected; (3) the utility model can enlarge the reometer range, makes reometer can both make indication in all cases, guarantee the monitoring effect, and can guarantee that sharpness and measuring accuracy get both, compact conformation, good looking appearance is generous, resistance to corrosion is strong, reliability is high.

Below Figure of description is further specified as follows: Fig. 1 is the structural representation of the online prison instrument of lightning arrester, Fig. 2 be the A of Fig. 1 to view, Fig. 3 is the circuit block diagram of lightning arrester on-line monitoring instrument, Fig. 4 is the circuit theory diagrams of lightning arrester on-line monitoring instrument.Among each figure: 1 be nut, 2 for lug plate, 3 for insulator, 4 for flange, 5 for stainless steel cage, 6 for control and testing board, 7 for capacitor, 8 for protector, 9 for nameplate, 10 for range conversion pilot lamp, 11 be that reometer dial plate, 12 is counted DJ, Bx for electromagnetism and protected gap, J ₁Be relay.

Embodiment of the present utility model can be as follows: (1) presses Fig. 1, shown in Figure 2, design, processing and manufacturing or buy each parts.For example, can adopt machine-tooled method and aluminium alloy bar processing nut 1, select corrosion resistant plate processing lug plate 2 for use; Can adopt casting method aluminum casting flange 4; Can adopt process for stamping and select for use the corrosion resistant plate punching press to form stainless steel cage 5, the napex of cover is offered preposition φ 115 tempered glass forms, and available latten(-tin) and insulating trip adopt machine-tooled method processing assembling protection gap (Bx) 8, and its clearance distance is chosen as the mm level; Available aluminium alloy plate is processed bottom plate 9 with machine-tooled method; Insulator 3 can be chosen GB772-87 type high voltage porcelain bushing; Capacitor 7 optional 10 μ F, DC400V; (2) press Fig. 3, design shown in Figure 4, protracting circuit plate, and the screening components and parts, control and testing board 6 is installed, wherein: bridge heap D ₁～D ₄(QL ₁) optional KBL36 type, bridge heap D ₅～D ₈(QL ₂) optional KBL10 type, superbright light emitting diode DG ₁～DG ₄Optional 3R4SC, the optional 44C of milliammeter gauge outfit ₂Type, relay J ₁Optional JRX-13F type, the optional DL103 type of message register; (3) press Fig. 1～shown in Figure 2, and assemble connection by described mutual alignment of top instructions and interconnected relationship, clamp affixed the forming of sealing with stainless steel support and seal during installation, high-voltage terminal the heart channel of Hang-Shaoyin insulator 3 from bottom plate 13 is drawn, and overall process is installed must carries out in the operating environment of temperature control (25 ± 5 ℃) control wet (＜65%).Its installation steps can be: 1. parts and insulating part are cleaned the back 60 ℃ drying box inner drying 1 hour with anhydrous alcohol, soak hydrophobic lacquer back airing after rubber seal is cleaned with anhydrous alcohol 2 hours; 2. assembling: begun to assemble from lower to upper by bottom plate: the chipware assembling finishes, and should debug, set protective current limit value, switching current limit value and verification current measurement precision etc. to control and testing board earlier before closing cover; Integral sealing clamps, and requires all to tighten firmware, and makes O-ring seal compression 20～30%, in the hope of excellent sealing; 3. test: do complete test by the technical conditions requirement, meet the certified products that are of technical requirement fully.

Claims

1, a kind of flange that includes, stainless steel cage, reometer, the lightning arrester on-line monitoring instrument of message register, it is characterized in that: it is by nut 1, lug plate 2, insulator 3, flange 4, stainless steel cage 5, control and testing board 6, capacitor 7, protector 8, range conversion pilot lamp 10, reometer dial plate 11, message register 12, bottom plate 13 connects and composes jointly, its mutual alignment and interconnected relationship are: nut 1 is by screw thread difference order and lug plate 2, insulator 3, flange 4 screws connection, lug plate 2 is electrically connected mutually with monitored lightning arrester lower end, and thereby flange 4 ground connection are realized that this on-line monitoring instrument and monitored lightning arrester are in series and are connected, stainless steel cage 5 by O-ring seal and flange 4 clamp the sealing affixed, on the control and testing board by soldering and the affixed circuit board that is equipped with of securing member, reometer and message register device, control and testing board 6 is installed on stainless steel cage 5 inner supports, the capacitor 7 of action circuit and the protector 8 that is made of protection gap Bx assembly all are loaded on the stainless steel cage inner support, be electrically connected mutually by lead between them, nameplate 9 is adhered in the preposition glass vision panel of monitor, range conversion pilot lamp is installed on the reometer dial plate, reometer dial plate 11 is loaded on the stainless steel cage top panel of monitor, and message register 12 places the reometer dial plate to offer in the window; Wherein: the circuit on the control and testing board is by comprising the I/V converter; electric current indicating value loop; the current measurement circuit in range conversion loop; the protection loop; the action counting circuit connects and composes jointly; its interconnected relationship is: after protection loop and current measurement circuit are in parallel and are connected again with move counting circuit and be in series and be connected; lightning arrester by lightning arrester electric current pipeline respectively with protection loop and current measurement circuit in the I/V converter be electrically connected mutually; the I/V converter by I/V converted output signal line respectively with the protection loop; electric current indicating value loop is electrically connected mutually; electric current indicating value loop is electrically connected with range conversion loop mutually by its output signal line; range conversion loop by its output signal line respectively with electric current indicating value loop; the action counting circuit is electrically connected mutually, and the action counting circuit is electrically connected with lightning arrester mutually by its output signal line.

2, by the described lightning arrester on-line monitoring instrument that includes flange, stainless steel cage, reometer, message register of claim, it is characterized in that described I/V converter is by cement resistor device R ₁, rectifier bridge heap (QL ₁) D ₁～D ₄, voltage stabilizing diode DW ₁～DW ₄Be electrically connected formation jointly; Electric current indicating value loop is by resistance R ₃～R ₁₀Potentiometer RW ₁, mA reometer, superbright light emitting diode DG ₁～DG ₄Be in parallel and connect and compose: range conversion loop is by voltage stabilizing diode DW ₅, relay J ₁, capacitor C ₁～C ₃, resistance R ₁₁Potentiometer R _W2Be in parallel and connect and compose; The protection loop is made of protection gap BX assembly; Action counting circuit resistance R ₂, zinc oxide nonlinear resistance slice R _MY1～R _MY2, zinc oxide varistor R _MY3, rectifier bridge heap (QL ₂) D ₅～D ₈, capacitor C ₄Message register DJ is electrically connected formation jointly.