CN205263237U - Handheld low forced lubrication electric detection means - Google Patents

Abstract

The utility model provides a handheld low forced lubrication electric detection means, includes: handheld terminal host computer contains: LCD display screen, numeric keypad and button, the interface that charges, one end are drawn from the wiring clip at handheld terminal host computer top and are placed the inside DSP that uses of host computer in as the control circuit of core with be used for the lithium cell of power supply, handheld terminal contains from quick -witted: switching on and shutting down button, the interface that charges, one end are drawn certainly handheld terminal and are followed the wiring clip of set -top portion and place the built -in portion of following in and use control circuit and the lithium cell of DSP as the core. The inside boost circuit of host computer can produce be used for the insulating 1kV high pressure that detects, the electric current acquisition circuit who is used for calculating insulation resistance, with 485 interface circuit, voltage acquisition circuit and phase sequence detection circuit from quick -witted communication, from quick -witted internal circuit can realize voltage acquisition, phase sequence detection and with host communication's 485 interface circuit. Examine time measuring before the power transmission, with the host computer work a telephone switchboard the clip respectively with sending end, receiving end cable joint intercommunication, remaining detection procedures will by the utility model discloses the device is automatic to be accomplished.

Description

Hand-held Low-voltage Transmission checkout gear

Technical field

The utility model belongs to fields of measurement, be specifically related to a kind of before the low-voltage cable power transmission of engineering construction erecting bed the full-automatic detection apparatus of voltage magnitude and phase sequence after insulation parameter, power transmission.

Background technology

At present, in the dynamo-electric installation process of architectural engineering, relate to the laying installation of distribution cable, for the insulation damages of stopping when cable insulation itself has problems or constructs, cable to be caused, need to before to cable power transmission, carry out the test of insulating properties.

And for different field conditions, the length of each distribution cable is each variant, some distribution cables in the scope of stretching out one's hand only several meters long; The tens meters of even hundreds of rice of growing up that have, at this time not only not in the scope of stretching out one's hand not even at one within sweep of the eye. Can the existence of the problems referred to above bring a uncertainty: be to determine it is two joints treating power transmission cable in two cable connectors of two places? therefore before survey cable insulation, need to get rid of above-mentioned uncertain factor by certain mode. Traditional wipe-out mode is exactly at power transmission scene, two Electrical Engineers divide the two ends that are clipped to cable under test, wherein a people is with wherein two heart yearns of a butt wiring short circuit cable under test, and whether an other people is positioned at the other end of cable and surveys these two heart yearns with the diode shelves of universal meter is electric path. If path, shows that cable socket that two people survey is for treating power transmission cable, by this " short circuit " test avoid misdelivering generation of electric situation. Got rid of the electric situation of misdelivery, and then one of them Electrical Engineer can use the insulation characterisitic of measuring cable for generation of the megger of direct current 1kV. And megger is manually to be shaken by engineer, when conventional rotating speed reaches 120r/min, megger will be exported the DC voltage of 1kV. The process of shake megger is a uncertain process, crosses slow voltage and does not reach test voltage and will carry out invalid test if shake speed; Substantially exceed 1kV test voltage if shake the too fast voltage of speed, thereby this voltage may puncture the insulating barrier of cable, cable is caused to permanent damage. Testing process before above-mentioned power transmission has some drawback: first waste of manpower need to have two people at the scene in the time of power transmission; There is error in its two testing process; Its three, the inadequate automation of testing process, etc. In addition, cable detection is needed to detection streamer end after complete and power transmission, i.e. the voltage of equipment receiving end and phase sequence, now needs again to utilize universal meter measure cable end piece voltage and utilize the phase sequence after phase-sequence meter test cable power transmission. As described above, the detection beginning from power transmission is until power transmission finishes, and whole process is intricate, automaticity is low.

Utility model content

The purpose of this utility model be to provide a kind of portable, reliability is high and widely used hand-held Low-voltage Transmission checkout gear.

For achieving the above object, the utility model adopts following technical scheme:

A kind of Low-voltage Transmission checkout gear, the automatic detection that while installation for civil buildings, industrial building electrical construction, before the power transmission in low-voltage cable loop, after short-circuit test, Insulation test and power transmission, voltage detecting and phase sequence detect, it comprises:

Handheld terminal main frame, with wherein one end electrical connection of cable under test, comprise: 5 binding clips and one end draw from the main frame other end be communicated with cable electrical, for showing the LCD LCDs of testing result, for inputting button, the charging inlet of the function such as setup parameter and switching on and shutting down; And main frame internal electronics, for realizing voltage magnitude after Insulation test, power transmission to cable under test and the mensuration of phase sequence, comprise: for generation of circuit for producing high voltage, electric current and voltage Acquisition Circuit, 485 communication interface circuits, circuit of testing the phase sequence, electric power management circuit and the DSP core control circuit of direct current 1kV, each part mentioned above circuit is connected with dsp chip by circuit;

Handheld terminal slave, with the electrical connection of the other one end of cable under test, comprises: 5 binding clips and one end draw from the slave other end be communicated with cable electrical, the button for power on/off function, charging inlet; And slave internal electronics, for 485 interface circuits, electric power management circuit and the DSP core control circuit of communication, each part mentioned above circuit is connected with dsp chip by circuit.

In described Low-voltage Transmission checkout gear, handheld terminal main frame comprises with slave: two pins of A, B that 485 transfer of data can be used switch the relay group that is switched to the slave inside on the different core of cable;

Wherein, after the binding clip of described main frame is connected with cable, the booster circuit of main frame inside is started working, and simultaneously inner current collection circuit is started working, and then current acquisition is got to the mean value of ten times for ten times at every turn and does computing, and insulating resistance of cable has as follows:

$R=\frac{{10}^3}{\underset{i=1}{\overset{10}{\Σ}}{I}_i/10}\left(\mathrm{\Ω}\right)---\left(1\right)$

In formula (1), R is insulating resistance of cable, molecule 10³Representative detects voltage 1kV, I_iFor the i primary current value detecting;

Wherein, after handheld terminal main frame carries out short circuit and Insulation test, Deng field engineer, test cable is carried out after power transmission, the cable that end is put in 5 binding clips that main frame is comprised and electricity consumption carries out, after electrical communication, carrying out the measurement of voltage magnitude by button main control system according to R, S, T, N, PE successively; When handheld terminal main frame gathers the voltage in three phase lines, the sinusoidal ac that the inner testing circuit detection of main frame R, S, tri-phase lines of T are conducted is with respect to the voltage magnitude between N line; In detected amplitude, the inner testing circuit of main frame detects the order of the crest arrival of above-mentioned simple alternating current electrical waveform; Finally, the result that handheld terminal main frame will obtain whole testing process is presented in lcd screen, and hand-held main frame is with memory function simultaneously.

The utility model has the advantages that: the hand-held Low-voltage Transmission checkout gear of the utility model has that cost is low, high-performance, high, multiple functional, the widely used feature of simple, the intelligent degree of principle.

Brief description of the drawings

Fig. 1 is the structural representation of hand-held Low-voltage Transmission checkout gear in embodiment of the present utility model;

Fig. 2 is hand-held main frame internal circuit schematic diagram in embodiment of the present utility model;

Fig. 3 is hand-held slave internal circuit schematic diagram in embodiment of the present utility model;

Fig. 4 is the positive sequence waveform that the sinusoidal ac that conducts to R, S, tri-phase lines of T of handheld terminal Host Detection arrives with respect to the voltage waveform peak value between N line;

Fig. 5 is the negative phase-sequence waveform that the sinusoidal ac that conducts to R, S, tri-phase lines of T of handheld terminal Host Detection arrives with respect to the voltage waveform peak value between N line.

Detailed description of the invention

For technological means that the utility model is realized, innovate characteristic, reach object and effect is easy to understand, following instance is specifically addressed the hand-held Low-voltage Transmission checkout gear of the utility model by reference to the accompanying drawings.

Fig. 1 is the structural representation of hand-held Low-voltage Transmission checkout gear in embodiment of the present utility model.

As shown in Figure 1, hand-held Low-voltage Transmission checkout gear, for detection of the insulation characterisitic of cable 30, comprises handheld terminal main frame 10 and handheld terminal slave 20.

Handheld terminal main frame 10 is positioned over the power transmission initiating terminal of cable to be detected, handheld terminal slave 20 is positioned over the equipment receiving end of cable under test simultaneously, the two coordinates for cable is detected, and comprises: binding clip 11 and 21, button 12 and 22, charging inlet 13 and 23, LCD display 14, at 485 interface circuits of slave inside with at voltage collection circuit and the circuit of testing the phase sequence of main frame inside.

The utility model provides a kind of Low-voltage Transmission checkout gear, the automatic detection that after short-circuit test, Insulation test and power transmission while installation for electrical constructions such as civil buildings, industrial buildings before the power transmission in low-voltage cable (line) loop, voltage detecting and phase sequence detect, it comprises: handheld terminal main frame, with wherein one end electrical connection of cable under test, comprise: 5 binding clips and one end draw from the main frame other end be communicated with cable electrical, for showing the LCD LCDs of testing result, for inputting button, the charging inlet of the function such as setup parameter and switching on and shutting down; And main frame internal electronics, for realizing voltage magnitude after Insulation test, power transmission to cable under test and the mensuration of phase sequence, comprise: for generation of circuit for producing high voltage, electric current and voltage Acquisition Circuit, 485 communication interface circuits, circuit of testing the phase sequence, electric power management circuit and the DSP core control circuit of direct current 1kV, each part mentioned above circuit is connected with dsp chip by circuit. Handheld terminal slave, with the electrical connection of the other one end of cable under test, comprises: draw from the slave other end and cable electrical UNICOM, the button for power on/off function, charging inlet 5 binding clips and one end; And slave internal electronics, for 485 interface circuits, electric power management circuit and the DSP core control circuit of communication, each part mentioned above circuit is connected with dsp chip by circuit.

At hand-held Low-voltage Transmission checkout gear provided by the utility model, can also there is such characteristic: wherein, after the binding clip of described main frame and slave is connected with cable, main frame and slave start taking cable under test as communications carrier, communicate taking 485 buses as communication modes, can switch on the different cores that are switched in cable by the relay of slave inside. If communication success, short-circuit test passes through. After the binding clip of described main frame is connected with cable, when main frame operation, its inner booster circuit is started working, and inner current collection circuit is started working simultaneously, for reducing measure error, at every turn then current acquisition is got to the mean value of ten times for ten times and do computing, insulating resistance of cable has as follows:

$R=\frac{{10}^3}{\underset{i=1}{\overset{10}{\Σ}}{I}_i/10}\left(\mathrm{\Ω}\right)---\left(1\right)$

In formula (1), R is insulating resistance of cable, molecule 10³For detecting voltage 1kV, I_iFor the i primary current value detecting.

At hand-held Low-voltage Transmission checkout gear provided by the utility model, can also there is such characteristic: wherein, according to described short circuit and the Insulation test of carrying out, then can detect and mensuration to voltage the phase sequence of cable cable under test power transmission aft engine, and result is presented on LCD display.

The Low-voltage Transmission checkout gear related according to the utility model, the solution that adopts High Performance DSP to be combined with high-precision sensor. In the time carrying out short-circuit test, DSP can be according to the relay group of pre-set programme-control inside in synchronization conducting R, S, T, these five lines of N, PE any two, thereby can form 485 communication loops, substitute traditional short-circuit test mode with communication modes, the relay in the complete hand-held main frame of short-circuit test disconnects automatically. Following the inner booster circuit of hand-held main frame is raised to 1kV and remains on 1kV output valve from 0V gradually, inner current collection circuit gathers the electric current flowing through in current two cores simultaneously, then do an arithmetical operation with current output voltage, moment is calculated the resistance value between current cable, once the resistance calculating is undergone mutation or directly lower than 1M Ω, illustrate that cable insulation characteristic does not meet the demands, now checkout gear stops detecting and output detections result on LCD display immediately; If otherwise the resistance detecting in the time that voltage is risen to 1kV by booster circuit is still not less than 1M Ω, the relay in main frame can switch and booster circuit starts to rise to 1kV from 0V again, until detected the insulating resistance value between any two cores. If cable under test is carried out not having extremely after a series of insulation characterisitic detections, can carry out power transmission to cable. Deng field engineer, test cable is carried out after power transmission, the cable that end is put in 5 binding clips that main frame is comprised and electricity consumption carries out after electrical communication according to R, S, T, N, PE successively, can carry out the measurement of voltage magnitude by button main control system. When handheld terminal main frame gathers the voltage in three phase lines, the inner testing circuit of main frame can detect sinusoidal ac that R, S, tri-phase lines of T conduct with respect to the voltage magnitude between N line. In detected amplitude, the inner testing circuit of main frame can also detect the order of the crest arrival of above-mentioned simple alternating current electrical waveform, if the order that the waveform peak that detects inner testing circuit arrives, successively from R, S, tri-phase lines of T, shows that this phase sequence is positive sequence; Otherwise, if testing circuit detect waveform peak value arrive order successively from R, T, tri-phase lines of S, show that this phase sequence is negative phase-sequence. Finally, the result that handheld terminal main frame will obtain whole testing process is presented in lcd screen, and hand-held main frame also has memory function simultaneously, all previous testing result can be stored in internal storage device, facilitates calling of historical data.

Based on the above-mentioned hand-held Low-voltage Transmission checkout gear shown in Fig. 1, the utility model has also proposed a kind of detection method, and it comprises following steps:

Step 1: by the binding clip of the main frame of described hand-held Low-voltage Transmission checkout gear and slave and cable under test two ends electrical communication, follow by button settings detected parameters and start to detect, 485 telecommunication circuits of the host and slave processors inside of described device communicate according to predefined communication protocol, and what confirm described host and slave processors binding clip connection by communication mode is two terminations of same cable;

Step 2: when main frame and the slave of described hand-held Low-voltage Transmission checkout gear are determined main by mode described in step 1, definite the belonging to after the two ends of cable under test of two cable sockets that slave binding clip connects, in the situation that need not disconnecting cable connector, the inner booster circuit of described hand-held Low-voltage Transmission checkout gear main frame is started working, booster circuit in described main frame slowly exports required 1kV high direct voltage to, the voltage of described main frame inside simultaneously, electric circuit inspection circuit is also in work, according to the described real-time calculating voltage of mean value algorithm and current ratio, calculate described insulating resistance of cable value, detect the insulating resistance value between any two cores of cable under test by described mode,

Step 3: after described hand-held Low-voltage Transmission checkout gear main frame is measured the insulation values of cable under test by mode described in step 2, if meeting, insulation resistance value is not less than 1M Ω, just can determine that cable under test meets power transmission condition, can take off the main frame of described hand-held Low-voltage Transmission checkout gear and the binding clip of slave, next just can carry out power transmission to cable under test. Send after electricity, by the electric UNICOM in termination of cable end after the binding clip of the main frame of described hand-held Low-voltage Transmission checkout gear and power transmission, can on that cable of electricity consumption end, proceed the detection of voltage magnitude and phase sequence.

The various embodiments described above can not depart from some variations in addition under scope of the present utility model, thus above explanation comprises and accompanying drawing shown in structure should be considered as exemplary, but not in order to limit the protection domain of the application's patent.

Claims (2)

1. a Low-voltage Transmission checkout gear, the automatic detection that while installation for civil buildings, industrial building electrical construction, before the power transmission in low-voltage cable loop, after short-circuit test, Insulation test and power transmission, voltage detecting and phase sequence detect, is characterized in that, comprising:

Handheld terminal main frame, with wherein one end electrical connection of cable under test, comprise: 5 binding clips and one end draw from the main frame other end be communicated with cable electrical, for showing the LCD LCDs of testing result, for inputting button, the charging inlet of setup parameter and switching on and shutting down; And main frame internal electronics, for realizing voltage magnitude after Insulation test, power transmission to cable under test and the mensuration of phase sequence, comprise: for generation of circuit for producing high voltage, electric current and voltage Acquisition Circuit, 485 communication interface circuits, circuit of testing the phase sequence, electric power management circuit and the DSP core control circuit of direct current 1kV, each part mentioned above circuit is connected with dsp chip by circuit;

Handheld terminal slave, with the electrical connection of the other one end of cable under test, comprises: 5 binding clips and one end draw from the slave other end be communicated with cable electrical, the button for power on/off function, charging inlet; And slave internal electronics, for 485 interface circuits, electric power management circuit and the DSP core control circuit of communication, each part mentioned above circuit is connected with dsp chip by circuit.

2. Low-voltage Transmission checkout gear according to claim 1, is characterized in that:

Wherein, handheld terminal main frame comprises with slave: two pins of A, B that 485 transfer of data can be used switch the relay group that is switched to the slave inside on the different core of cable;

Wherein, after the binding clip of described main frame is connected with cable, the booster circuit of main frame inside is started working, and simultaneously inner current collection circuit is started working, and then current acquisition is got to the mean value of ten times for ten times at every turn and does computing, and insulating resistance of cable has as follows:

In formula (1), R is insulating resistance of cable, molecule 10³Representative detects voltage 1kV, I_iFor the i primary current value detecting;

Wherein, after handheld terminal main frame carries out short circuit and Insulation test, Deng field engineer, test cable is carried out after power transmission, the cable that end is put in 5 binding clips that main frame is comprised and electricity consumption carries out, after electrical communication, carrying out the measurement of voltage magnitude by button main control system according to R, S, T, N, PE successively; When handheld terminal main frame gathers the voltage in three phase lines, the sinusoidal ac that the inner testing circuit detection of main frame R, S, tri-phase lines of T are conducted is with respect to the voltage magnitude between N line; In detected amplitude, the inner testing circuit of main frame detects the order of the crest arrival of above-mentioned simple alternating current electrical waveform; Finally, the result that handheld terminal main frame will obtain whole testing process is presented in lcd screen, and hand-held main frame is with memory function simultaneously.