CN2245292Y - Three-phase low voltage direct-insert power supply monitor - Google Patents

Abstract

The utility model relates to a monitor in a power supply line for solving the problem of the theft protection electricity of circuits, comprising three sets of primary special established balancing transformers respectively connected with three-phase electricity in series. A secondary transformer is connected with a main control circuit via a diode and a thyristor. The main control circuit comprises a commutation filtering circuit, a delay circuit, an executive circuit, and a contactor which are mutually connected in parallel, and the contactor is connected with a three phase power supply in series and is controlled by a relay in the executive circuit. The monitor can accurately get unbalance signals, and effectively prevents various electric larceny behaviors from generating. The utility model has the advantages of simple structure, simple manufacturing process, and low cost. The monitor is suitable for matching with a three-phase kilowatthour meter for theft protection electricity within the three-phase low voltage of 3 to 1 00A.

Description

Three-phase low pressure direct-insert power supply monitor

The utility model relates to the monitor device in a kind of power supply circuit.

There is very big breach in power system power supply at present, the annual according to statistics stolen electric weight whole nation surpasses 1,500,000,000 kilowatt hours, amount to RMB with a toll of more than 8,500,000,000 yuan, particularly the three-phase low-voltage power supply system is the main goal of attack of electricity filching person, so far also there is not three-phase low pressure device against charge evasion, particularly poly-talented electrical burglary stealing activity is growing, and the loss that causes more is difficult to estimate.

The purpose of this utility model provides a kind of three-phase low pressure direct-insert power supply monitor that prevents the particularly poly-talented electrical burglary stealing of stealing effectively.

The utility model comprises housing, the printed circuit board (PCB) of installing in line-entering hole on the housing and wire hole and the housing that is loaded with control circuit, the structure that it is characterized in that control circuit be comprise with three-phase electricity in each respectively corresponding mutually three group of connecting special advise parameter and around balancing transformer, primary directly seals in each phase power supply, transformer secondary output one termination controllable silicon negative pole, the other end connects the SCR control utmost point through diode forward, the controllable silicon negative pole is incorporated an electric capacity and a resistance into the control interpolar, the controllable silicon positive pole connects the governor circuit common terminal by resistance, governor circuit comprises current rectifying and wave filtering circuit parallel with one another, delay circuit and executive circuit, the positive input of rectified wave wave circuit connects arbitrary phase in the three-phase electricity, common terminal is through the normally-closed contact connecting to neutral line of electric capacity and the control of executive circuit repeat circuit, another another termination controllable silicon negative pole of normally-closed contact one termination zero line of relay control, the structure of delay circuit and executive circuit is to incorporate into after resistance and the capacitances in series between the forward output and common terminal of current rectifying and wave filtering circuit, intermediate contact connects the switching tube base stage, the switching tube collector electrode connects with forward output and common terminal through resistance respectively with emitter, wherein collector electrode connects another SCR control utmost point simultaneously, controllable silicon is anodal to connect filter circuit forward output and common terminal respectively with negative pole, circuit breaker connects with forward output and common terminal respectively in the executive circuit, sealed in the three phase mains respectively by the contactor of relay control.

The utility model embodiment accompanying drawings is as follows:

Fig. 1 monitor profile schematic diagram.

Fig. 2 monitor control circuit block diagram.

Fig. 3 control circuit principle connection layout.

The another kind of control circuit schematic diagram of Fig. 4, Fig. 5.

Fig. 6 monitor is installed wiring schematic diagram.

As shown in Figure 1, this monitor comprises line-entering hole 2 and wire hole 3 and the interior printed circuit board (PCB) of installing that is loaded with control circuit 4 of housing on housing 1, the housing, wherein control circuit as shown in Figure 3, comprise with three-phase electricity in each respectively corresponding mutually three group of connecting special advise parameter and around balancing transformer M ₁, M ₂, M ₃, primary directly seals in each phase power supply, transformer secondary output one termination controllable silicon T ₂Negative pole, the other end is through diode 3 (or D ₄Or D ₅) forward connects the SCR control utmost point, the controllable silicon negative pole is incorporated a capacitor C 5 and a resistance R into the control interpolar ₆, the controllable silicon positive pole passes through resistance R ₅Connect the governor circuit common terminal, governor circuit comprises current rectifying and wave filtering circuit parallel with one another, delay circuit and executive circuit, by diode D ₁, D ₂And capacitor C ₂, C ₃The current rectifying and wave filtering circuit forward input of forming connects the A phase, and common terminal is through capacitor C ₁With the normally-closed contact connecting to neutral line of executive circuit repeat circuit control, another another termination controllable silicon of normally-closed contact one termination zero line T ₂Negative pole, delay circuit is a resistance R with holding circuit structure ₂And capacitor C ₄Incorporate current rectifying and wave filtering circuit after the series connection into, intermediate contact connects the switching tube base stage, and switching tube collector electrode and emitter are respectively through resistance R ₄, R ₃Connect with filter circuit forward output and common terminal, wherein collector electrode connects another controllable silicon T simultaneously ₁The control utmost point, controllable silicon is anodal to meet output of filter circuit forward and common terminal, executive circuit repeat circuit J respectively with negative pole ₁Incorporate filter circuit into, the contactor that controlled by relay seals in respectively in the three phase mains and (omits among the figure).Also can incorporate in the governor circuit by resistance R ₁, luminous tube LED and voltage-stabiliser tube DW ₁The show circuit that composes in series, (seeing luminous tube 5 among Fig. 1) also can incorporate other into as the language loop, alarm loop etc.In this example three groups of special rule parameters and around balancing transformer put into attached body 6 (see figure 6)s separately and be connected lead sealing with the terminals of ammeter 7.

When not having electricity filching behavior to take place, circuit certain mutually in taking-up alternating current 220V voltage signal, through D ₁, D ₂, C ₂, C ₃The rectification of circuit and filtering are exported a stable 12V direct-flow signal voltage, at R ₁The pressure drop of last generation direct current is delay circuit and executive circuit and powers up wait state.When electricity filching behavior takes place, the circuit disequilibrium, the stealing signal voltage is greater than 0.63V, make shaping trigger controllable silicon work, the relay contact closure of tending to act makes the work of 380V contactor, reaches the circuit interruption purpose, after delaying time, recover normal power supply, do not cut off as electricity filching behavior, the follow-up teasel root electricity of delaying time, when repeatedly after three times main line do not restoring electricity.

The also available Fig. 4 of this monitor governor circuit, circuit shown in Figure 5.

The utility model advantage: 1, adopt special rule balancing transformer energy Obtaining Accurate circuit not Balanced signal can prevent the generation of mechanical type and poly-talented electricity filching behavior effectively, is special Gram amount with the stealing instrument; 2, this product structure is simple, and production technology is easy, does not need Large-scale special equipment, low cost of manufacture, be suitable for three-phase low-voltage between 3-100A with three The anti-electricity-theft special use that the phase kilowatt-hour meter is supporting; 3, this monitor volume is little, price in light weight Cheap, highly sensitive, can guarantee that safe operation of electric network is reliable.

Claims (3)

1, a kind of three-phase low pressure direct-insert power supply monitor, comprise housing, the printed circuit board (PCB) of installing in line-entering hole on the housing and wire hole and the housing that is loaded with control circuit, the structure that it is characterized in that control circuit be comprise with three-phase electricity in each respectively corresponding mutually three group of connecting special advise parameter and around balancing transformer, primary directly seals in each phase power supply, transformer secondary output one termination controllable silicon negative pole, the other end connects the SCR control utmost point through diode forward, the controllable silicon negative pole is incorporated an electric capacity and a resistance into the control interpolar, the controllable silicon positive pole connects the governor circuit common terminal by resistance, governor circuit comprises current rectifying and wave filtering circuit parallel with one another, delay circuit and executive circuit, the positive input of rectified wave wave circuit connects arbitrary phase in the three-phase electricity, common terminal is through the normally-closed contact connecting to neutral line of electric capacity and the control of executive circuit repeat circuit, another another termination controllable silicon negative pole of normally-closed contact one termination zero line of relay control, the structure of delay circuit and executive circuit is to incorporate into after resistance and the capacitances in series between the forward output and common terminal of current rectifying and wave filtering circuit, intermediate contact connects the switching tube base stage, the switching tube collector electrode connects with forward output and common terminal through resistance respectively with emitter, wherein collector electrode connects another SCR control utmost point simultaneously, controllable silicon is anodal and negative pole connects filter circuit forward output respectively and it is with holding, circuit breaker connects with forward output and common terminal respectively in the executive circuit, sealed in the three phase mains respectively by the contactor of relay control.

2, power supply monitor according to claim 1 is characterized in that incorporating into simultaneously in the governor circuit show circuit by resistance, luminous tube and voltage-stabiliser tube serial connection, also can incorporate a language loop or alarm loop into.

3, power supply monitor according to claim 1 and 2, it is characterized in that three groups of special rule parameters and around balancing transformer can put into an attached body separately and be connected lead sealing with the terminals of ammeter.

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