CN2170527Y - Multifunctional low-voltage distribution line detector - Google Patents

Abstract

The utility model discloses a multi-functional low pressure distribution lines detector has the casing, is equipped with gauge outfit and range selection switch on the casing, and casing one end has the measurement to keep silent, characteristics with measuring: the casing is provided with a jack for measurement, a multifunctional power supply line detection circuit is arranged in the casing, and the meter head adopts a meter head with an indicator locking device. The leakage protector can quickly find the leakage fault of a low-voltage power supply line and the tripping reason of the leakage protector under the condition that a low-voltage power grid is not powered off, can also measure voltage, current and resistance, and can particularly measure the dim light or the narrow environment position where a meter head is not easy to observe. Is very convenient to carry and use.

Description

Multifunctional low-voltage distributing line tester

The utility model relates to the pick-up unit of measuring the electrical property in the electric variable technical field, or perhaps the sniffer of electric fault; Specifically, be a kind of to power circuit carry out short circuit, open circuit, the proving installation of leakage or incorrect connection, the device of location of fault in a kind of exploration cable, transmission line or the network in other words conj.or perhaps.

At present; China has generally used the rural area more than 80%; earth leakage protective device has been used in town and country in a large number; but owing to the common power line of reasons such as aging circuit and city illumination circuit etc.; particularly the rural power service circuit often causes the earth leakage protective device tripping operation; faults such as power failure; there is some other leaky in addition; in order to find out the trouble spot; electrician's workload increases day by day; the considerable working time is used for the circuit inspection; sometimes also to take out stitches and check separately; not only waste man-hour, even, user's work and life can not normally be carried out also because of checking that failsafe point influences normal power supply for the moment.

Disclose some leakage detectors in the Chinese patent application, they have adopted the leak current detection device that is made of several iron cores, several coils mostly, and circuit, structure be complexity, function singleness, poor reliability all, make and use all inconvenient.

The purpose of this utility model provide a kind of be used to detect supply line's fault, simple in structure, portably use multifunctional low-voltage distribution line detector easily.

Technical solution of the present utility model is: a kind of multifunctional low-voltage distribution line detector, has housing, gauge outfit and range switch are housed on the housing, one end of housing has to measure uses jaw, the difference of itself and prior art is: have on the housing to measure and use jack, multifunctional low-voltage distribution line testing circuit is housed in the housing, and gauge outfit adopts has the gauge outfit of pointer locking device.

Comprise leakage current detection circuit, ac voltage detection circuit, alternating current testing circuit, resistance detecting circuit in the multifunctional low-voltage distribution line testing circuit in the utility model, range switch provides each testing circuit to be connected with conversion between gauge outfit, be connected to an amplifying circuit behind the leakage current detection circuit, a direct supply provides required power supply for foregoing circuit.Certainly, above-mentioned testing circuit also can be done suitable increase and decrease, and concrete circuit structure also can be done suitable variation, to adapt to different use needs.

Also comprise earth leakage protective device action current testing circuit in the multifunctional low-voltage distribution line testing circuit of the present utility model.Certainly, in the time need not increasing the earth leakage protective device measuring ability, also can not add foregoing circuit.

Earth leakage protective device action current testing circuit in the utility model is loaded in the attachment housings, and attachment housings connects with jack by measuring with the detector main casing.Certainly, earth leakage protective device action current testing circuit also can be loaded in the same housing with other circuit.Attachment housings also can adopt other to connect form with the detector main casing.

The gauge outfit with pointer locking device in the utility model is to have added mechanical type pointer damping mechanism in the gauge outfit of common structure.Certainly, the pointer locking device also can adopt other suitable mechanisms.

Leakage current detection circuit during this is practical adopts split core type current transformer.

The utility model has the advantages that: circuit structure is simple, volume is little, in light weight, carry and use all very convenient, can in time detect the various situations on the low-voltage distributing line, (the especially electric leakage in 220V and the 380V supply line), and need not cut off supply line and stop power supply, find out the trouble spot in the supply line apace, guarantee the normal power supply of circuit, being particularly suitable for vast rural area and city industrial enterprise uses, be convenient to the ruuning situation that the electricity-management personnel in time grasps circuit, help in time eliminating potential faults, alleviate the electrician, especially rural area electrician's labour intensity is increased work efficiency.Particularly can measure, use meter pointer locking device locking pointer, read reading clearly at bright place subsequently, enlarge use occasion and scope at the dark weak or narrow and small place of environment of light that be difficult for to observe gauge outfit.

The utility model is described in further detail below in conjunction with drawings and Examples:

Fig. 1 is the external structure synoptic diagram of a kind of multifunctional low-voltage distribution line detector of the present utility model.

Fig. 2 is the circuit diagram of the adoptable a kind of multifunctional low-voltage distribution line testing circuit of the utility model.

Fig. 3 is the circuit diagram of the adoptable a kind of additional earth leakage protective device action current testing circuit of the utility model.

A kind of pointer locking device structure synoptic diagram that Fig. 4 adopts for the utility model.

Fig. 1 has described an embodiment of the present utility model.This embodiment has a plastics main casing 1, and main casing one end is equipped with gauge outfit 4, range switch 3, and a pair of Ω jack 5 and a pair of V jack 6 are arranged for measuring jaw 2 on the housing 1, the gauge outfit 4 other pointer locking switches 7 that are equipped with.Can loosen the pointer locking switch earlier in use, pointer is adjusted in zero-bit.When measuring leakage current, range switch can be placed the 250mA shelves, (three-phase four-wire system should be put zero line of three phase lines to clamp together tested lead with measurement jaw 2, single-phasely should put a live wire, a zero line) can on gauge outfit, read reading, can find out the leak current fault point easily according to the reading situation, less as numerical value, can change range switch in the 100mA shelves.When measuring alternating current, range switch can be placed suitable shelves, clamp together tested lead, can on gauge outfit, read reading.When measuring alternating voltage, range switch is placed suitable shelves, insert at V jack 6 and measure test pencil, promptly available test pencil is measured ac voltage.When measuring resistance, range switch can be placed suitable shelves, insert test pencil at Ω jack 5, can measure after the zeroing.

Fig. 2 has described the adoptable a kind of physical circuit of the utility model.Comprise a split core type current transformer CT in the circuit, other elements also comprise resistance R 1, R2, R3, R6, R7, R8, R9, R11, R12, R13, R14, R15, R16, R17, R18, potentiometer RP2, RP3, capacitor C 1, C2, C3, diode D2, D4, D5, D6, D7, gauge outfit M, integrated operational amplifier circuit N(DA2822M), LED, K switch, battery E etc., jack XS1, XS2, XS3, XS4 are used for grafting table rod etc., and range switch comprises～mA ,～A, S ,～V, Ω etc. select shelves.The principle of work those skilled in the art of foregoing circuit is appreciated that so omits description.But functional circuit such as adjunction such as negative temperature compensation also on integrated circuit N is with the further performance of improving.

Fig. 3 has described the adoptable earth leakage protective device action current of the utility model testing circuit, and this circuit can be contained in the attachment housings, and a pair of jack L, N are arranged on the attachment housings, a pair of plug XS3 ', XS4 '.When being used for testing the earth leakage protective device action current; range switch on the detector main body can be placed the S shelves; again the XS3 ' on the earth leakage protective device action current test accessories, XS4 ' plug are inserted among jack XS3, the XS4 on the main casing; simultaneously the black table penholder is gone into the N jack of annex, red test pencil inserts the L jack.During actual the test; the black table anterior end of pen is inserted the earth (or corresponding ground connection), and red test pencil front end inserts protected circuit, and each is gone up mutually, when the current regulating switch on the slow adjusting annex when protector trips; observe the gauge outfit respective value simultaneously, be protector action current value.Comprise resistance R 19, R20, potentiometer RP4, triode V in the foregoing circuit, current/voltage transition components RVD(Tongzhou water meter factory produces) etc. components and parts.

Fig. 4 has described the meter pointer locking device that the utility model adopted.A sliding bar 11 moving up and down is arranged in this device, there is a spring 12 sliding bar 11 lower ends, the sliding bar upper end is fixed with a pointer amortisseur bar 13, pointer amortisseur bar 13 is circular-arc, slewing area basically identical with meter pointer, and be positioned at below the pointer, a shifting block 14 is equipped with in sliding bar 11 sides top (directly over can certainly being or other correct position), shifting block 14 upper ends are exposed at the detector case surface becomes toggle switch, the position that the shifting block lower end is supported on sliding bar 11 upper ends is divided into two parts, and one is that 15, one of recessed parts are bossings 16, when stirring shifting block 14, if recessed part 15 is positioned at support zone when top on the sliding bar 11, under the effect of spring 12, sliding bar 11 is up, thereby make pointer amortisseur bar 13 prop up meter pointer, make pointer keep the present position and can not be shifted.When stirring shifting block round about, when making the bossing 16 of shifting block 14 be positioned at support zone top on the sliding bar 11, it is descending that bossing 16 makes sliding bar 11 overcome the resistance of spring 12, thereby make pointer amortisseur bar 13 leave pointer, and pointer can move freely.Certainly, the meter pointer locking device also can adopt the embodiment of other versions.

Claims (6)

1, a kind of multifunctional low-voltage distribution line detector, has housing, gauge outfit and range switch are housed on the housing, housing one end has to measure uses jaw, it is characterized in that: have on the housing to measure and use jack, multi-functional supply line testing circuit is housed in the housing, and gauge outfit adopts has the gauge outfit of pointer locking device.

2, multifunctional low-voltage distribution line detector according to claim 1, it is characterized in that: comprise leakage current detection circuit, alternating current testing circuit, ac voltage detection circuit, resistance detecting circuit in the multi-functional supply line testing circuit, range switch provides each testing circuit to be connected with conversion between gauge outfit, be connected to an amplifying circuit behind the leakage current detection circuit, a dc supply provides required power supply for foregoing circuit.

3, multifunctional low-voltage distribution line detector according to claim 2 is characterized in that: also comprise earth leakage protective device action current testing circuit in the multi-functional supply line testing circuit.

4, multifunctional low-voltage distribution line detector according to claim 3 is characterized in that: earth leakage protective device action current testing circuit is loaded in the attachment housings, attachment housings connects with jack by measuring with the detector main casing.

5, according to claim 1 or 2,3,4 described multifunctional low-voltage distribution line detectors, it is characterized in that: the gauge outfit with pointer locking device is to have added mechanical type pointer damping mechanism in the gauge outfit of common structure.

6, according to claim 2 or 3,4 described multifunctional low-voltage distribution line detectors, it is characterized in that: leakage current detection circuit adopts split core type current transformer.

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