CN101685110B

CN101685110B - Variable frequency memory alternating current acousto-optic electroscope

Info

Publication number: CN101685110B
Application number: CN2008102002595A
Authority: CN
Inventors: 丁裕春
Original assignee: SHANGHAI HUADONG POWER EQUIPMENT CO Ltd
Current assignee: SHANGHAI HUADONG POWER EQUIPMENT CO Ltd
Priority date: 2008-09-23
Filing date: 2008-09-23
Publication date: 2011-04-20
Anticipated expiration: 2028-09-23
Also published as: CN101685110A

Abstract

The invention discloses a variable frequency memory alternating current acousto-optic electroscope, comprising a power input circuit, an amplifying circuit, an oscillator, a power amplifier and an acousto-optic alarm circuit. The power input circuit is connected with a self-checking circuit which is connected with a memory circuit, the memory circuit is connected with a variable frequency control circuit which controls the oscillator to change oscillating frequency; when the electroscope is in self-checking, a test button is pressed down, the input circuit acquires a high-voltage grid signal from a probe of the electroscope, and the variable frequency control circuit controls the oscillator to generate another oscillating frequency which is output to the acousto-optic alarm circuit by the power amplifier so as to give out high-frequency alarm acousto-optic signals. Aiming at the defect that a test signal is difficult to be distinguished with an electricity test alarm signal in the existing high-voltage electroscope, the invention provides a high-voltage electroscope which can obviously distinguish the test signal, the electricity alarming signal and hard light and can adapt to big noise and other serve environments. Two frequencies are adopted to distinguish the test function and the electricity checking function and therefore, the electroscope has memory function, low cost, security and reliability.

Description

Variable frequency memory alternating current acousto-optic electroscope

Technical field

The present invention relates to the electroscope that a kind of testing high voltage electrical network is used.

Background technology

The electroscope that existing testing high voltage line voltage is used, its alarm generally all are sound and light alarms, i.e. it all is a kind of sound and light alarm that self check warning and electrical verification are reported to the police, and causes false alarm easily; In addition, when the test environment deterioration, under high light or high noise environments, whether the tester is imperceptible reports to the police, and the tester is difficult to judge whether to exist high-tension electricity, has both influenced job schedule, brings danger again.And, also there is not at present the electroscope that can use at sleety weather, there is not to remember electroscope with the delay test signal yet.

Therefore, be necessary newly developed a kind of can distinguishing tests signal and electrical verification alerting signal, and the high voltage electroscope that is applicable to rugged surroundings such as big noise, high light line.

Summary of the invention

Technical matters to be solved by this invention is, exist test signal and electrical verification alerting signal to be difficult to distinguish and can't to adapt to high light, the shortcomings such as test environment of noise greatly at existing high voltage electroscope, the high voltage electroscope that a kind of obviously distinguishing tests signal and electrical verification alerting signal and high light is provided and can adapts to rugged surroundings such as big noise.

A kind of variable frequency memory alternating current acousto-optic electroscope, comprise power supply input circuit, amplifying circuit, oscillator, power amplifier and sound light alarming circuit, power supply input circuit connects a self-checking circuit, self-checking circuit connects a memory circuit, memory circuit connects a frequency conversion control circuit, frequency conversion control circuit control oscillator changes the concussion frequency, when the electroscope self check, press the test knob, input circuit obtains the electrical network high-voltage signal from the electroscope probe, frequency conversion control circuit control oscillator produces another kind of concussion frequency, transports to sound light alarming circuit through power amplifier, sends higher-frequency chimes of doom light signal.

Described memory circuit is that the input end at a metal-oxide-semiconductor connects into reverse bias with two diodes, and with a big capacity earth.

Described frequency conversion control circuit is collector series connection one electric capacity at a triode, and this capacity earth reduces the concussion frequency, otherwise, multivibrator rising frequency.

For conserver power source, described power supply is to be transformed to the 5V powered by direct current by the 1.5V battery through booster circuit.

Power supply input circuit connects a time-delay shutdown circuit, does not do any operation in 4 minutes after test is finished, and the electroscope power supply is closed automatically, and power light extinguishes.

Adopt different colours electroscope shell region component voltage service rating, avoid occurring other electroscope of level other other voltages of level of application verification mistakenly.And the aluminium alloy packing box of employing and electroscope color of shell correspondent voltage grade equipment is to prevent to misapply the electroscope of different voltages.

Technique effect of the present invention is embodied in:

One, distinguishes electrical verification by high-frequency signal and low frequency signal and report to the police and the test warning, test and electrical verification can be made a distinction well, avoid mistake will test and obscure with electrical verification;

Two, be provided with a memory circuit, after the electroscope electrical verification, the alerting signal that can also keep a period of time, if under mal-conditions such as high light, big noise, electroscope can be moved on to sheen, quietly the place checks whether there is high pressure, the ability of condition of compatibility improves greatly, can be described as the electroscope of round-the-clock test;

Three, adopt the high-efficiency battery chip that boosts to boost, save No. 5 common batteries as power supply with one, reached the life-span long, cost is low, test reliable effect;

Four, to have a volume little for this electroscope, advantage such as function is many, and use cost is low, and is safe and reliable.

Five, adopt enclosed construction, be equipped with and go up false proof cover insulating bar, can in the sleet environment, use;

Description of drawings

Fig. 1 is a schematic block circuit diagram of the present invention;

Fig. 2 is circuit theory diagrams of the present invention.

Embodiment

As depicted in figs. 1 and 2,

A kind of high voltage electroscope with two kinds of sound and light alarms, comprise power supply input circuit, amplifying circuit, oscillator, power amplifier and sound light alarming circuit, power supply input circuit connects a self-checking circuit, self-checking circuit connects a memory circuit, memory circuit connects a frequency conversion control circuit, frequency conversion control circuit control oscillator changes the concussion frequency, when the electroscope self check, press the test knob, input circuit obtains the electrical network high-voltage signal from the electroscope probe, frequency conversion control circuit control oscillator produces another kind of concussion frequency, transports to sound light alarming circuit through power amplifier, sends higher-frequency chimes of doom light signal.

The probe of electroscope front end is with after high-voltage fence contacts, by capacitor C g coupling and dividing potential drop, through D1 and D2 rectification and clamper, the half-wave AC signal is amplified (can test different detection voltage by adjusting the different intrinsic standoff ratio of R2, R3) via the detecting amplifier that R2, R3, Q1 form, on C1, produce the DC voltage relevant with the high-tension electricity amplitude.Because the time constant of C1, R4 is very big, could report to the police so have only when really detecting high-tension electricity, induced electricity and chopped cooked entrails of sheep electric field on every side there is certain filtration, in order to avoid the electroscope false alarm.When this voltage reaches certain amplitude, 10 pin of integrated circuit U1C become high level by low level, by the anti-phase once more high level that becomes of U1D, make the LF multivibrator work of forming by U1A, U1B, produce dutycycle and be about 50%, frequency is the low-frequency pulse of 1.5HZ, amplifies through Q5, drive hummer B1 and red highlighted LED 3 and send the sound and light alarm signal, have on the alarm test person hi-line.

On the basis of finishing above basic electrical verification process, this electroscope has increased test and function and memory function are distinguished in electrical verification, and its principle of work is as follows:

(1) test is with the electrical verification discrimination circuit-according to the up-to-date regulation of the relevant power department of country, requirement must be adopted different sound and light alarm forms when testing with electrical verification, in case test circuit misoperation when test jobs causes wrong report.So this circuit adopts different acousto-optic frequencies when testing with electrical verification.Its principle of work is as follows: press testing button during test, and the PB1 closure, the G end of Q2 is low level, then Q2 ends.Another road is sent into the bias current signal by D3, R6 to Q1, the Q1 conducting, and 10 pin of U1C are output as low level, audible-visual annunciator work, but because the existence of R7 makes the Q4 conducting, the common port of multivibrator is by C9 ground connection, this moment, oscillation frequency was lower, was 1.5HZ, and the self check of expression electroscope is normal.Q1 conducting during electrical verification obtains a higher voltage on the C1, make 10 pin of U1C be output as low level on the one hand, and by R12, D4 charges to C2, and makes the Q2 conducting on the other hand.End owing to Q4 can not get enough bias voltages, be equivalent to not connect C9, then multivibrator is distinguished different duties with the higher frequency operation of 2.5HZ with this.

(2) memory function-the consider difference of electrical verification environment sometimes may electrical verification under the condition of high light and strong noise, makes the sound and light alarm signal testing undermanned to experience, so increased memory function.Its principle of work is as follows: Q1 conducting after measuring high-tension electricity, by R12, D4 C2 is charged, because the input resistance Rgs of metal-oxide-semiconductor is up to 10 ¹¹Ω, so after probe left hi-line, anti-inclined to one side because of D4, D5, the electricity on the C2 can only lead to high Rgs discharge, its velocity of discharge is very slow, thus in 10 seconds, can keep sound and light alarm continuous, in order to tester's close-ups.

The high voltage electroscope of domestic production at present is in order to reach the purpose of small size, so all adopt the power supply mode of 4 joint 1.5V button cells basically.It is little that button cell exists capacity, and serviceable life, short, the difficult shortcoming of buying so this machine has adopted No. 5 common batteries of a joint, by forming efficient booster circuit by U2 and peripheral circuit, was transformed into 5V voltage, for measuring warning circuit work.The conversion efficiency of this circuit very high (can reach more than 82%), even and cell voltage be low to moderate 0.8V, electroscope can also operate as normal. when cell voltage dropped to 1V, (LED1) was bright for under-voltage red led, told operating personnel in time to change battery.In addition, this machine is not established power switch, as long as press testing button will work the time, power supply is opened automatically, and carries out self check.Finish as self check and to carry out high voltage testing, higher voltage is arranged on the C8 so always, the booster circuit operate as normal, electroscope also is in the electrical verification state always.As not doing any operation (comprise not according to testing button and do not detect high-tension electricity) in 5 minutes, the electricity on the C8 is by R17, the R18 discharge, and when voltage was low to moderate certain value, power supply was closed automatically, and electrical verification is as long as click testing button more once more.A general joint alkaline battery will use 1 year under normal operational circumstances at least.

Claims

1. variable frequency memory alternating current acousto-optic electroscope, comprise signal input circuit, amplifying circuit, oscillator, power amplifier and sound light alarming circuit and power supply, it is characterized in that, signal input circuit connects a self-checking circuit, self-checking circuit connects a memory circuit, memory circuit connects the circuit that a controlled frequency changes, this circuit control oscillator changes the concussion frequency, when the electroscope self check, press the test knob, input circuit obtains the electrical network high-voltage signal from the electroscope probe, and frequency conversion control circuit control oscillator produces another kind of concussion frequency, transport to sound light alarming circuit through power amplifier, send higher-frequency chimes of doom light signal;

Described memory circuit is that the input end at a metal-oxide-semiconductor connects into reverse bias with two diodes, and with a big capacity earth;

The circuit that described controlled frequency changes is, at collector series connection one electric capacity of a triode, after the triode conducting, this capacity earth reduces the concussion frequency, otherwise, multivibrator rising frequency.

2. by the described variable frequency memory alternating current acousto-optic electroscope of claim 1, it is characterized in that described power supply is to be transformed to the 5V powered by direct current by the 1.5V battery through booster circuit.