CN2143017Y

CN2143017Y - Low-voltage electrical leakage monitor for mine use

Info

Publication number: CN2143017Y
Application number: CN 93203112
Authority: CN
Inventors: 徐葆桢
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-02-17
Filing date: 1993-02-17
Publication date: 1993-09-29
Anticipated expiration: 2003-02-17

Abstract

The utility model discloses a low voltage electricity leakage monitor for mine use, comprising a casing, an electricity leakage latching electric appliance, an electricity leakage protection electric appliance, a double power supply circuit, etc. The utility model with the advantages of small size, and convenient installation and operation is an integrated part of electricity leakage protection, and latching. The low voltage electricity leakage monitor for mine use can be conveniently arranged in a power distribution cabinet, becoming the electricity leakage protection of a branch circuit, and can be matched with an air circuit breaker, and an A. C. contactor into a switch, or a starter with the functions of electricity leakage protection, and electricity leakage latching. The low voltage electricity leakage monitor for mine use can be widely used in the low voltage power network of nonferrous metal, the iron mine, the chemical and industrial mine, and other mining areas (wells) not needing explosion proof function.

Description

Low-voltage electrical leakage monitor for mine use

The utility model relates to a kind of mining electrical equipment, especially a kind of mining selective low-voltage electric leakage monitor.

At present, the low voltage electric network property selected earth leakage protective device is progressively promoted in the colliery, produces in the use and obtains better technical effect.Product generally has two classes, and a class is as an integral body, and whole parts are contained in the flameproof enclosure of a heaviness, interior external connection is all very complicated, lacks the earth leakage search/lockout function, and another kind of is as an annex, be placed in the special explosion-proof switch, and split to close and carry out partial reequipping, can not independently use.And general common mine does not need explosion-proof, power with radiant type, be mainly the trunk line type power supply unlike the colliery, the radiant type power supply is because a way is more, the network complexity, needing a kind of collection electric leakage and earth leakage search/lockout function is that the whole body, volume are small and exquisite, the mining selective low-voltage electric leakage monitor device of convenient and flexible installation.

It is one that the purpose of this utility model is to provide a kind of collection earth leakage protective and earth leakage search/lockout function, and volume is little, and is easy for installation, independent used mining selective low-voltage electric leakage monitor.

The utility model comprises a shell, zero sequence current mutual inductor and wiring board are housed in the shell, the main traverse line position of main traverse line perforation becoming a zero sequence current mutual inductor primary side of wherein reserving on the shell, the part available epoxy of moisture-sensitive casting in the shell, sampling and pilot are by drawing on the protection terminal of both sides, the work indication is housed on upper surface, earth leakage search/lockout indication and artificial test button, circuit is to constitute like this, the fault-signal Acquisition Circuit connects latch-up protection circuit and leakage protection circuit respectively, power supply A connects earth leakage search/lockout protective circuit, direct current signal circuit, voltage signal circuit; Power supply B coupling part latch-up protection circuit and earth leakage protective signal processing circuit.The earth leakage search/lockout protective circuit links to each other with action link with leakage protection circuit.

The utlity model has earth leakage protective and earth leakage search/lockout dual-use function, can resemble and install and use very easily the common straight-through current transformer, the body kind is little, reliability is high.Can be contained in each shunt of distribution substation, as earth leakage protective to each branch road; Also can be contained in the power distributing cabinet, as the earth leakage protective of motor or other electric equipment.

Description of drawings is as follows:

Fig. 1 is a profile schematic diagram of the present utility model;

Fig. 2 is a circuit block diagram of the present utility model;

Fig. 3 is a more detailed circuit block diagram of the present utility model;

Fig. 4 is circuit theory diagrams of the present utility model.

Below contrast this practical embodiment of description of drawings.The upper surface of Fig. 1 middle shell 1 is provided with nameplate 8, work indication 4, and earth leakage search/lockout indication 3, artificial test button 2 is provided with a main traverse line perforation 9 that penetrates housing 1 on the front surface of housing 1, be provided with protection terminal 6 and 7 at two sides of housing 1.Label 5 is housing 1 detachable end.Operating circuit can be clear that from two block diagrams the fault-signal Acquisition Circuit connects latch-up protection circuit and leakage protection circuit, and power supply A connects latch-up protection circuit, direct current signal circuit, voltage signal circuit; Power supply B coupling part exclusive circuit and earth leakage protective signal processing circuit; The earth leakage search/lockout circuit links to each other with action link with leakage protection circuit.

Can draw more detailed circuit relationships from Fig. 3, wherein, DZ is a circuit breaker, CJ is for exchanging tentaculum, CJK be ac contactor control circuit and, TQ is a breaking coil, LH is a current transformer, BSQ is the earth leakage search/lockout sampling, and QY is the under-voltage coil of circuit breaker, and BSJ is the earth leakage search/lockout relay, DYA is power supply A, DYB is power supply B, and YQ is a voltage sampling, and YZ is the voltage shaping, ZLQ is the direct current sampling, LP is a filter, and ZLZ is the direct current shaping, and SY is a hookup, LZ is a current shaping, WF is a differential circuit, and MKJ is that pulsewidth detects BJ ₁, BJ ₂Be comparator, GL is an isolator, and CKJ is an exit relay.Earth leakage search/lockout sampling BSQ connects earth leakage search/lockout relay BSJ, and earth leakage search/lockout relay BSJ connects the control circuit of A.C. contactor, or the under-voltage coil of circuit breaker, voltage sampling YQ diametral voltage shaping YZ and comparator BJ ₁Link to each other, direct current sampling ZLQ connects direct current shaping ZLZ through filter LP, and is connected to comparator BJ ₁, comparator BJ ₁Output connect isolator GL, isolator GL connects another comparator BJ ₂, link current shaping LZ from the secondary lead wires of current transformer, be connected above-mentioned comparator BJ with pulsewidth MKJ through differential circuit WF ₂, its output connects breaking coil TQ through exit relay CKJ.Fig. 4 is the circuit diagram of the above-mentioned block diagram of realization, and clearly discloses whole devices and annexation.

The utility model zero-sequence current orientation principle carries out the phase bit comparison by the residual voltage electric current of electric leakage branch road, and whether be fault branch, be the reliability of guaranteeing to judge if distinguishing, and the direct current signal that occurs when utilizing electric leakage is again participated in comparison.Residual voltage is by R _8-10End socket draw, give C ₆, R ₁₁, W ₂Phase shift is through IC ₂Be shaped as a series of square waves, through R ₁₅, D ₁₀Export IC to ₅The 6. pin, direct current signal is by R ₁₆Draw, through C ₇, R ₁₇, C ₈Deng filtering, through WY ₄Be added in IC ₄, when electric leakage signal was enough big, this potential change caused IC ₄Upset is to IC ₅With voltage signal mutually " with ", isolate from the output of BG3 collector electrode through photoelectricity and to deliver to IC ₁₀, zero sequence current signal is delivered to IC ₆Be shaped to square wave, through C ₁₂, R ₂₇Differential is spike, delivers to IC ₇, IC ₈, IC ₁₀The pulsewidth of forming detects, make less than the pulse of a certain width can not false triggering after level, " with " after signal deliver to IC ₁₀With front signal mutually " with ", when leak current fault, output pulse deliver to IC ₉Broadening is given WY ₆Amplitude limit triggers BG4 and makes the IZJ action, connects TQ and makes the DZ tripping;

Artificially test by SA and resistance R ₃₃Form, can carry out self check this monitor.

The earth leakage search/lockout circuit is by the earth leakage search/lockout BGQ that takes a sample, and blocking relay BSJ forms, and BSQ is by D ₁-D ₃, W ₁, R ₇Form, during electric leakage, IC ₁The input potential change make the 3ZJ dead electricity, its contact disconnects the coil of CJ, and CJ can not be connected; Perhaps the under-voltage coil of cut-off breaker can not close a floodgate circuit breaker.The 3ZJ normally closed contact is connected D simultaneously ₆Send the earth leakage search/lockout indication.

Power supply is made up of power supply ADYA and power supply BDYB two parts, and DYA connects the earth service voltage loop, DC loop and earth leakage search/lockout loop.The floating ground of DYB, the two is isolated by photoisolator GL.Can reduce the interference of ground connection to signal processing.

Earth leakage search/lockout protective circuit of the present utility model or leakage protection circuit also can use separately.Promptly only use as latch-up protection or earth leakage protective.The utility model can be widely used in non-ferrous metal, iron ore, chemical industry ore deposit and other does not need in the low voltage electric network of explosion-proof mine (well).

Claims

1, a kind of mining selective low-voltage electric leakage monitor, the upper surface that it is characterized in that shell (1) is provided with nameplate (8), work indication (4), earth leakage search/lockout indication (3), artificial test button (2), on the front surface of housing (1), be provided with a main traverse line perforation (9) that penetrates housing (1), two sides at housing (1) are provided with protection terminal (6,7), the fault-signal Acquisition Circuit connects latch-up protection circuit and leakage protection circuit, power supply A connects the latch-up protection circuit, the direct current signal circuit, voltage signal circuit, power supply B coupling part exclusive circuit and earth leakage protective signal processing circuit; The earth leakage search/lockout protective circuit links to each other with action link with leakage protection circuit.

2, according to claim 1 with mining selective low-voltage electric leakage monitor; it is characterized in that latch-up protection circuit wherein is to constitute like this; earth leakage search/lockout sampling BSQ connects earth leakage search/lockout relay BSJ; earth leakage search/lockout relay BSJ connects the control circuit of A.C. contactor, the perhaps under-voltage coil of circuit breaker.

3, according to the mining selective low-voltage electric leakage monitor of claim 1, it is characterized in that leakage protection circuit wherein is to constitute like this, voltage sampling YQ is through voltage shaping YZ and comparator BJ ₁Link to each other, direct current sampling ZLQ connects direct current shaping ZLZ through filter LP and leads to comparator BJ ₁, comparator BJ ₁Output connect, isolator GL, the output of GL is connected to BJ as the signal of voltage and direct current independently ₂Participate in last comparison.Link current shaping LZ from the secondary lead wires of current transformer, detect MKJ through differential circuit WF with pulsewidth and be connected above-mentioned relatively BJ ₂, its output connects breaking coil TQ through exit relay CKJ.

4, according to the mining selective low-voltage electric leakage monitor of claim 1, it is characterized in that power supply A connects the earth, the floating ground of power supply B, the two is isolated by isolator GL.

5,, it is characterized in that being sent to the back level after current signal is handled through pulsewidth participates in comparison according to the mining selective low-voltage electric leakage monitor of claim 1.