CN2225056Y - Monitor for metering electric power - Google Patents

Abstract

The utility model discloses a monitor for metering the electric power used for monitoring the operating conditions of the electric power metering systems of the large and the medium power consumers, comprising unit circuits, such as, an LH parameter sampling circuit of a current transformer, a comparison output circuit, a phase sequence checking circuit, a current-voltage IV comparison circuit, a logical judgment circuit, a time generating circuit, a timer circuit, a power supply circuit, a reserve power supply circuit, a space detection control circuit, a balance regulating circuit, etc. The monitor for metering the electric power can effectively detect various faults of the electricity and the charging system, prevents the artificial electric larceny, and sends out the alarm signal. The unit is an hour to record the existence time of the faults. The utility model can prevent the false alarm of safety wire fusing or failure contact in the main line. Reserve batteries are arranged in the monitor, so as to realize the space detection and store the original data.

Description

The electric energy metrical monitor

The utility model relates to a kind of electric energy metrical monitor, and it is used for monitoring the working condition of the electric energy metered system of big, power consumer, belongs to electronic device.

Power supply department is in order to guarantee the normal operation of electric charge system, or prevents artificial cheating, uses the iron case that all charging utensils (watt-hour meter, mutual inductor etc.) sealing is locked usually.This mode is easy, but is unfavorable for finding hidden failure, and is difficult to avoid illegally unblanking key management inconvenience.Occurred several technology that prevent stealing on watt-hour meter in recent years, two types of electric current, voltage sampling formula and sealing protection formulas were arranged in summary.They all have advantage simple in structure, that investment is little.But have many defectives: 1, only be applicable to civil watt-hour meter or direct-type watt-hour meter, can't use to big or middle power consumer.2, external connection or watt-hour meter domestic demand are changed, and annex is too many, influence the watt-hour meter precision in case damage.3, principle of work is simple, has the people of electricity knowledge to be easy to penetrate.4, after being arranged, people's stealing restores to the original state groundless looking into.In view of the foregoing, electricity management department is difficult to approve and installs and uses.The metering system principle of power consumer as shown in Figure 1, the induced current among the current transformer LH and main line (or voltage transformer (VT) YH produce) sequence voltage mutually promote watt-hour meter and rotate counting.If have in the LH loop phenomenons such as phase shortage, misphase are arranged in short circuit, open circuit, paraphase or the voltage circuit, the metering of table will lose precision, cause Lou and will count, stops meter, fall to count.

The purpose of this utility model provides a kind of electric energy metrical monitor that is used for monitoring the electrical metering system situation of big, power consumer, and whether the work of its monitoring electric power metering system is normal.In a single day the task of electric energy metrical monitor is exactly in time to reflect these faults, electric fault or man-made fault takes place in these loops, instrument will send alerting signal, and while record trouble life period, until fault clearance.

To achieve these goals, electrical metering system is realized monitoring, this monitor need possess following characteristics: 1, install instruments and do not change former metering system wiring.2, do not influence the original system precision.3, Installation and Debugging are convenient, do not add other annex.4, the power failure monitoring function is arranged.In order to realize monitoring, at first must be to processing of taking a sample of the parameter in each current transformer LH loop, its less important phase sequence to voltage circuit differentiates that the two is the key component of this instrumental function of realization.After failure message is converted to level signal and is sent to logic judging circuit and differentiates, remove to drive alarm lamp more respectively and open timing circuit.The logic diagram of circuit of whole instrument as shown in Figure 2, tool housing and panel are as shown in figure 19.

The utility model electric energy metrical monitor comprises: operating circuit part in tool housing and the instrument shell, the tool housing panel is provided with unusual timing and shows 1, abnormal alarm shows that 2 balance adjustment selector buttons and balance show 3, tool housing leaves three circular holes 4 that are used for the regulating circuit balance, and tool housing leaves wiring hole 5.When this monitor is installed and used, instrument A phase K ₁, K ₂Be attempted by A phase current mutual inductor LHa K is arranged ₁, K ₂On the point (Fig. 1, Figure 18), the rest may be inferred for all the other two-phases.A, B, four lead-in wires of C, N (Fig. 1, Figure 15) and receive on the contact of relevant voltage coil of watt-hour meter on the instrument.

The operating circuit part that is characterised in that monitor of the present utility model, the annexation of each element circuit of electric energy metrical monitor with principle of work (Fig. 2) is: current transformer LH parameter sampling circuit output end is connected with the input end that compares output circuit, and current transformer LH parameter sampling circuit is connected in series an adjustable impedance element LX in each loop of current transformer LH ₁, LX ₂, LX ₃Be connected in a high frequency oscillator U in parallel ₁Three high-frequency signal output terminal F ₁, F ₂, F ₃Go up (Fig. 4) high frequency oscillator U ₁Apply a high-frequency signal for each loop of current transformer LH, the electric parameter in current transformer LHa, LHb, three loops of LHc is converted to corresponding millivolt voltage signal respectively, and the HF voltage that each current transformer LH is inducted is converted to a millivolt step voltage E after high pass filter filters is sent into the wave detector detection _A, E _B, E _COutput, output terminal is connected with the input end that compares output circuit; Current transformer LH parameter sampling circuit is the voltage E of each current return _A, E _B, E _CSend into the input end of comparison output circuit, compare with the voltage comparator of setting, when this loop was normal or is short-circuited or opens a way, a millivolt voltage signal presented different value, through output circuit relatively relatively one of back output indicate level, deliver to the input end of next stage logic judging circuit; When current transformer LH parameter sampling circuit output end is connected with comparison output circuit input end, it also is connected with the input end of a current/voltage IV comparator circuit, current transformer LH parameter sampling circuit is with the 50HZ low-frequency voltage of inducting among current transformer LH each loop LHa, LHb, the LHc, through low-pass filter filtering, send into relatively back outputs level signals of voltage comparator behind the amplitude limit, send into an input end of current/voltage IV comparator circuit, the level signal of being exported has reflected having or not of load current; The phase sequence check circuit is with line of electric force A, B, C phase voltage or be converted to the low pressure trapezoidal wave earlier from the three-phase voltage that voltage transformer (VT) YH takes out and send into testing circuit again and differentiate phase sequence, output voltage phase sequence misphase fault level signal is then sent into another input end of next stage current/voltage IV comparator circuit; Current/voltage IV comparator circuit input end respectively with an output terminal of current transformer LH parametric circuit, the output terminal of phase sequence check circuit connects, common access conditions of level signal that the reflected load electric current that the reflected load of phase sequence check circuit has or not the level signal of phase voltage to export with current transformer LH parameter sampling circuit has or not and two input ends of door, be connected with the input end of the logic judging circuit of next stage with the output terminal of door, also export another input end of sending into logic judging circuit by the misphase fault-signal of phase sequence check circuit input; The input end of logic judging circuit is connected with the output terminal that compares output circuit output terminal and current/voltage IV comparator circuit respectively, be sent to the input end of logic judging circuit by current return and the detected short circuit of voltage circuit, open circuit, phase shortage, the unification of misphase fault-signal, in order to prevent burr and the industrial noise pulse in the line of electric force, be connected to the interference filtering circuit in each branch road respectively; The output terminal of logic judging circuit is connected with the input end of timer circuit and the input end of warning circuit respectively, logic judging circuit removes the fault level of combination to open the control gate of timer on the one hand, add up fault-time, remove to light corresponding alarm lamp on the other hand; The output terminal of time generating circuit is connected with an input end of logic judging circuit, and time generating circuit (1 hour) is at set intervals just exported the control gate that a pulse removes to close timer; Power supply and standby power supply (battery) provide stable DC voltage for circuitry; The input end that detects control circuit at interval is connected with standby power supply with an output terminal of time generating circuit respectively, the output terminal that detects control circuit at interval is connected with the comparison output circuit with current transformer LH parameter sampling circuit respectively, after exchanging power failure, standby power supply work, detect control circuit at interval off and on to current transformer LH parameter sampling circuit and relatively output circuit power supply, realize detecting at interval; Balance adjustment circuit is connected with current transformer LH parameter sampling circuit, regulates the adjustable impedance element LX of current transformer LH parameter sampling circuit respectively ₁, LX ₂, LX ₃Realize balance, and show that by the balance on the instrument panel 3 show.

The utility model can be monitored big or middle power consumer electrical metering system working condition effectively, detect all kinds of faults of electric charge system reliably, in time reflect short circuit in the current transformer LH loop, open circuit, fault such as phase shortage, misphase or man-made fault in the voltage circuit, send alerting signal, and, eliminate until fault hour to be unit record fault life period.This monitor can prevent the wrong report that blown fuse in the main line or loose contact cause, having only when load has phase current and when not having phase voltage, fault-signal output is arranged.The anti-industrial noise ability of this machine is strong, reserve battery is housed in the instrument, as run into power failure, when operating a switch, still keep measuring ability and be automatically converted at interval detecting, preserve original record data, if the people is the pressure-wire (comprising the instrument power supply) that pulls off electric charge system, in the line of electric force main line electric current is arranged, instrument will be as fault handling.

Further specify content of the present utility model below in conjunction with accompanying drawing.

Fig. 1 is the metering system electrical schematic diagram of power consumer.

Fig. 2 is the utility model logic diagram of circuit.

Fig. 3 is the circuit diagram of current transformer LH parameter sampling element circuit medium-high frequency oscillator U1.

Fig. 4 is a current transformer LH loop parameter sampling unit circuit diagram among the total figure of the utility model circuit.

Fig. 5 is for comparing the output unit circuit diagram.

Fig. 6 is a phase sequence inspection unit circuit diagram.

Fig. 7 is a current/voltage IV comparing unit circuit diagram.

Fig. 8 is the logic judgment unit circuit diagram.

Fig. 9 is a time generating unit circuit diagram.

Figure 10 is the timer unit circuit diagram.

Figure 11 is power supply and standby power unit circuit diagram.

Figure 12 is for detecting control unit circuit figure at interval.

Figure 13 is balance adjustment element circuit figure.

Figure 14 always schemes for the utility model circuit.

Figure 15 is PCB in the utility model printed circuit board (PCB)-A plate.

Figure 16 is printing board PCB-B plate.

Figure 17 is printing board PCB-C plate.

Figure 18 is printing board PCB-D plate.

Figure 19 is the utility model tool housing and panel synoptic diagram.

The circuitry of electric energy metrical monitor mainly is made up of cmos digital circuit technical grade linear circuit and all kinds of device.All electrical schematic diagram is explained as follows referring to existing logic function and the structure with regard to each element circuit of accompanying drawing (14):

(1) current transformer LH loop parameter sample circuit (Fig. 4):

The effect of this part circuit is that the electric parameter with LHa, LHb, three loops of LHc is converted to corresponding millivolt signal, simultaneously each LH loop induced potential is converted to level output.It is made up of high frequency oscillator, Hi-pass filter, low-pass filter and comparator circuit.High frequency oscillator U ₁Schematic diagram shown in accompanying drawing (3), be the assembly of an individual packages, wherein comprise three identical circuit, use respectively mutually for a, b, c.This is a kind of distortion " carat sprinkles " oscillator, and the base stage of triode BG has 2 divider resistance RB in each circuit ₁, RB ₂, the emitter of triode BG connects an emitter resistance RE, capacitor C ₁And C ₂Serial connection back and inductance L also are connected to the collector of triode, capacitor C ₁And C ₂Contact draw a lead and be connected capacitor C with transistor emitter.One end and triode emitter and capacitor C ₁And C ₂The connection lead of contact connect other end output high-frequency signal.High frequency oscillator U ₁ Centre frequency $f_{}$ ${}_0=\sqrt{1/2\mathrm{\&pi;L}(C_1{\mathrm{<figure-callout\; id="2"\; label="C"\; filenames="Y9523424900191.png,Y9523424900221.png"\; state="\{\{state\}\}">C</figure-callout>}}_2/{\mathrm{<figure-callout\; id="1"\; label="C"\; filenames="Y9523424900191.png,Y9523424900221.png"\; state="\{\{state\}\}">C</figure-callout>}}_1+C_2)}$ 。High-frequency signal has F respectively ₁, F ₂, F ₃Output.Hi-pass filter and wave detector are by C ₂₂, L ₁, D ₆, C ₃, R ₃Form (mutually) Deng element to a wherein, high-frequency signal by foregoing circuit at J ₁Form a millivolt step voltage E on the line _AThe 50HZ voltage response of inducting among the LH load state in the electric power main line, this voltage is through low-pass filter (referring to a phase) L ₄, C ₄And D ₁₃, D ₁₂Send into comparer U2:A-5 pin behind the amplitude limit, U2:A-4 is provided with very low comparative voltage E _s, as induced potential E _LH＞E _sThe time, must export the pulse of high-amplitude positive half-wave on U2:A-2 pin, through D ₉, C ₉Become a high level behind the integration.Because E _sIf must be very low, so the level of output has reflected having or not of load current in principle.The three-phase circuit principle is identical.

(2) compare output circuit (Fig. 5):

Major function is with normal, the short circuit in LH loop, chopping signal difference output.At first will detect the end of oppisite phase U7:A-4 (referring to a phase) that voltage EA sends into linear circuit, pass through simultaneously every diode D ₃Send into U7:D-11 pin.U7:A-5 is provided with lower comparative voltage ED, and U7:D-10 is provided with higher comparative voltage UH.As LH loop ED＜EA＜EH just often, U7:A-2=" 0 ", U7:D-13=" 0 " do not have the output of fault level; EA＜ED when the short circuit of LH loop, U7:A-2=" 1 " has short circuit level output; EA＞EH when open a way in the LH loop, U7:D-13=" 1 " have the output of open circuit level.There are J13, J14 line to send respectively.

(3) phase sequence is checked part:

Referring to accompanying drawing), mainly be to check whether the three-phase voltage phase sequence that inserts watt-hour meter is correct.A, B, C three-phase voltage obtain the low pressure trapezoidal wave through photoelectrical coupler U3 on its U3-15-13-11 pin, send into U5:A, U5:B, U5:D again.When per two phase waveform intersect, three and door order appearance " 1 " pulse.The U9:A of back is connected into R-S trigger, U9:B is connected into d type flip flop.U9:A-1=" 1 " → U9:A-1=" 0 " → U9:B-13 → " 0 " when the phase sequence of importing is correct, circulation repeatedly.Be provided with the output of misphase fault level.When the input phase sequence was put upside down, above-mentioned circulation was squeezed, just wrong always phase fault level output.In order to prevent that the electric power major loop from having loose contact to cause wrong report, be provided with anti-clutter circuit, constitute by D24, R31, C18, the fault high level of output has the J10 line to send.

(4) I, V comparator circuit (Fig. 7):

Cause erroneous judgement for preventing in the electric power main line that blown fuse or cable malfunction phase shortage cause to obscure, must be provided with the IV comparator circuit.For example when wherein A is mutually working properly (load has electric current).J ₄On the line high level, i.e. U10:A-2=" 1 ".And U3-15 has positive half-wave pulse output, and through D21, C11 is integrated into high level " 1 ", sends into U4:C-5, U4:C-6=" 0 ", and U10:A-1=" 0 ", by U10:A and computing, U10:A-3=" 0 " does not have the output of fault level as a result.When the blown fuse of A phase, LHa does not have induced potential output.That is: U10:A-2=" 0 ", U4:C-6=" 1 ", U10:A-3=" 0 ", still non-fault signal output.Have only when the A phase load electric current is arranged, and when not having the A phase voltage, that is: U10:A-2=" 1 ", U4:C-6=" 1 ", U10:A-3=" 1 " just has phase failure level signal to export.The three-phase comparative result all through or the door U11:B send by the J12 line again.U13:A forms condition and door among the figure, and when three-phase electricity was pressed with phase shortage or decompression, this sealing no longer detected phase sequence.The J11 line keeps low level always.

(5) logic distinguishing circuit (Fig. 8):

Function is to merge to distribute all kinds of fault-signals, opens the timing control gate and lights alarm lamp.The short-circuit signal level is introduced through U11:C by J13, and U12:A sends into U15:A-6; The open circuit signaling level is introduced by J14 and is sent into U15:A-6 through U12:A; Phase shortage, reversed phase signal level are introduced through U11:C by J12, J11, and U12:A also sends into U15:A-6.Above-mentioned signal is the anti-interference filtration circuit by being made up of D20, R25, C13 all, in case disturbing pulse and switch burr.U15:A is R-S trigger, the switch of its 1 pin (Q end) output level control timing door U20:A.When powering on originally, Q=" 0 ".The time pulse that the J16 line is introduced can not enter counter by U20:A.When the fault high level is added to U15:A-6 (S end), Q=" 1 ", U20:A is open-minded, and pulse enters timer.Whenever count one hour, burst pulse of U20:A-3 output is by U20:B, and U12:D sends into U15:A-4 (R end), to the trigger zero clearing to close timing control gate U20:A.If still there is (U15:A-6=" 1 ") in fault, then zero clearing is invalid.U16:A, U16:B form another R-S trigger, and U16:A-3=when powering on " 1 " (U20:B-5=" 1 ") does not influence the U15:A zero clearing.When open fault takes place when, U16:A-3=" 0 ", U20:B closes, and U15:A can't zero clearing, and then U20:A timing control gate can not be closed, (because of the LH open circuit is pernicious fault).Counter is the cumulative time always.Three class fault-signals also pass through U20:D, U20:C, and U16:D opens corresponding warning path through U19:E, and U19:D, U19:F drive and make LED glittering, and the pulse that control rests is introduced by the J15 line.

(6) time generating circuit (Fig. 9):

It is typical time generating circuit, wherein JT is the crystal of 32.768KHZ, and the phase inverter of it and U14 itself constitutes oscillator and send U15:B to by U14-3 after U14 makes 14 frequency divisions, is exported by U15:B-13 behind two frequency divisions, send into U18-10, U18 makes ten two divided-frequencies.Each frequency division output forms pulse in a hour by U13B decoding back.The width that has determined hour pulse retardation time of U19:A, B, three impact dampers of C wherein.U14-3 also exports one 1/2 pulse per second (PPS) and partly flashes use as alarm lamp by J15 line supply logic determines.Hour pulse is given the counting control gate by the J16 line.

(7) timer circuit (Figure 10):

U21～23 and three charactron constitutes three decade counters, maximum count value 999.U21～U23 collection is counted, deciphers, is latched, and drives in one, and the power consumption of preserving data is minimum, can the battery long-term work.The common cathode of LED charactron is direct ground wire, seals in relay contact JD2 ground connection again but draw by the J19 line, so that cut off the current path of D1S1～3 when losing AC power, the too big LED of current sinking is extinguished.Alarm lamp also is connected in this part, be equally negative electrode not directly, purpose all is in order to prolong the service time of reserve battery.

(8) power supply and standby power supply circuit (Figure 11):

Since the design of the Overall Power Consumption of this instrument very little (＜2W), its communication power supply is directly taken from the A phase line, establishes power supply lead wire no longer in addition.T1 output～7.5V * 2 alternating voltages send into U25 after D26, D27 rectification C16 filtering, and voltage stabilizing is used for circuitry about 5V.JD is the 6V miniature relay, adhesive when AC power is arranged, otherwise discharge.Contact JD1 connects reserve battery GB, and JD2 cuts off all high-current device paths.K1, U ₁Form the photoelectric control loop, control level is drawn the timing signal of taking from time circuit by the G point, and discontinuous operation adopts the trickle mode to charge into GB, to guarantee not damage battery.C19 is the bigger electrochemical capacitor of capacity, guarantees to keep when the AC and DC power supply switches voltage, unlikelyly causes loss of data.SW is the instrument total power switch, has the function of zero clearing simultaneously concurrently.

(9) interval testing circuit (Figure 12):

After exchanging power failure, this part circuit control sampling section discontinuous operation is arranged.U17 is a decimal ring counter, and 2 pulse per second (PPS)s enter U17-14 (counting end) from the J17 line, so U17-3 had one 2 pulse per second (PPS) output in per 20 seconds.U12:B is two inputs or door, and U6, U8 are the impact dampers with current driving ability.When Alternating Current Power Supply just often, U12:B-6=" 1 " is output as " 1 ", promotes U6, U8 work, has electric current and voltage to confess.After exchanging power failure, battery-powered entirely, at this moment still there is noble potential on the C24, U6, U8 have output voltage.C24 is constantly by R32, the discharge of D28 back resistance, after some time, reduce to (U12:B-6=" 0 ") under the U12:B threshold potential, U6, U8 disconnect, the intermittent pulse that only is taken at U12:B-5 pin is open-minded at interval, time of 1/10th is arranged to the power supply of sampling comparator circuit, realized detecting at interval.

(10) balance adjustment circuit (Figure 13):

Because kilowatt meter charge system LH loop parameter and wiring distribution parameter have very big discreteness, the voltage millivolt value of EA (EB, EC) point can not be a weighing apparatus definite value.The balancing circuit must be set, make EA voltage on rational value.U24 and on every side components and parts constitute " window " voltage comparator, whether it can indicate voltage that EA orders in allowed band.After instrument inserts metering system, by regulating the L of sampling section _X1, L _X2, L _X3Realize adjusting.When regulating the A phase time, press the SA button with hand, regulate L * 1, VD4 (green) VD5 (Huang) lamp is extinguished entirely both be balance, B, C be also roughly the same said method operation mutually.After three-phase has all been transferred, restart the primary power source switch SW, instrument has been operated in equilibrium state.

(11) complete machine structure (Figure 15):

The whole components and parts of NJ-1 type monitor are contained in respectively on large and small different four pcb boards, and most circuit are welded on PCB-A.The A plate is fixed on the metal base plate of instrument.Wherein counter portion and balance indicating section are welded on PCB-B plate, shown in accompanying drawing (16).The B plate is fixed on the instrument front panel behind, uses so that observe.Adopt CH2.5 * 12 plug connectors weldering to connect between A, B two plates with flexible cord.The high frequency oscillator components and parts all are welded on PCB-C platelet, as accompanying drawing (17), have debug the back at circuit and have irritated as a stand-alone assembly use with the epoxy resin envelope.With five hard wire bonds on PCB-A plate.For the ease of regulating L in the circuit _X1, L _X2, L _X3All be welded on PCB-D plate, the D plate be fixed on the A plate with screw, and with lead in 4 connections of F1, F2, F3, the GND of two plates.With flexible cord the three-phase K1K2 point on the D plate is attached on the instrument external connection screw, also A, B on PCB-A plate, 4 of C, N is attached on the instrument external connection screw with flexible cord.Power transformer T1 is fixed on the metal base plate, is connected on PCB-A plate with flexible cord.Four batteries are installed in the instrument loam cake behind, use the S1 plug connector and are connected to main circuit.Power switch SW is installed in the terminal box, guides to PCB-A plate with flexible cord.L _X1-3 three adjustable elements are located at the instrument below, are provided with the circular hole of three diameter 8mm, implement to regulate to put in special-purpose release handle.The structure of whole instrument and profile are referring to Figure 19.The concrete parameter of each components and parts is as follows:

NJ-1 components and parts detail list numbering title specifications and models U1 high frequency oscillator 50KHZ～100KHZU2, U7 four voltage comparator LM2901U3 four photoelectrical couplers TLP-521U4 hex inverter CD4069U5, U10, U20 42 input ends and door CD4081U6, U8 six inverter buffer CD4049U9, U15 double D trigger CD4013U11 33 input ends or door CD4075U12 42 input ends or door CD4071U13 44 input ends and 12 grades of binary counter CD4040U19 of door CD4082U14 14 bit serial binary counter CD4060U16,42 input end Sheffer stroke gate CD4001U17 decimal system count splitter CD4017U18, six non-inverting buffer CD4050U21, U22, the U23 decimal system counts/deciphers/latch/driver CD40110U24 dual operational amplifier LM258U25 three rectifies voltage adjuster LM7805C1-3 electrolytic condenser CD11 47 μ F/50VC4-6 capacitor CBB 220n/160VC7-9 capacitor CBB12 1n5/63VC10-12 capacitor CBB12 2n2/63VC13-14 tantalum electrolytic capacitor CA42 470n/25VC15, C52 electrochemical capacitor CD11 1 μ F/50VC16 electrochemical capacitor CD11 470 μ F/25VC17 ceramic disc capacitor device 30PC18 tantalum electrolysis CA42 2.2 μ F/25VC19 electrolysis 1000 μ F/25VC20～22 capacitor CBB 10n/160VC23 electrolysis CD11,470 μ F/25VC24 electrolysis CD11 10MF/50VC25-C51 capacitor 10n/63VC26, C28, C29, C52 capacitor 47n/63VR1-4 1/8W metalfilmresistor 4K7 4R5 " 6K2 1R6-7; R54 " 100K 3R8 " 20K 1R9-12; R18-20; R53 " 10K 8R13-15, R33, R35, R57 " 5K1 6R16; R50-51; R58-60 " 510 6R17, R32 " 200K 2R21-23 1/4W metalfilmresistor 220K 3R24-25 1/8W metalfilmresistor 1M 2R26; R52 " 51K 2R27, R31 " 2M 2R28-30 " 10K 3R34 1/4W metalfilmresistor 100 1R55 1/8W metalfilmresistor 47K 1R56 " 1K 1R36 1/2W metalfilmresistor 51 1D1-28 switching diode 1N4148D16-18 silicon diode 1N4007D26-27 " 1N4001D10, D12, D14 germanium diode 2AP9VD1-3 light emitting diode φ 5 (redness) VD4 " φ 5 (green) VD5 " φ 5 (yellow) V1 NPN triode 2N5551K1 one-way SCR 1A/400VJD relay 6VGB nickel-cadmium chargeable battery 3AhT1 power transformer 3VA 220/7.5 * 2RV voltage dependent resistor (VDR) 470V/2.5KASA, SB, the small-sized toggle switch JT of SC touch-switch SW quartz crystal 32.768KHZD1S1-3 is cloudy charactron LTS547RS1-2 socket head CH2.5 * 12L1-6 colour coding inductance 820 μ HLX1-3 controllable impedances 10-20 μ H altogether

Claims (4)

1, a kind of electric energy metrical monitor, it comprises: operating circuit part in tool housing and the instrument shell, the tool housing panel is provided with unusual timing and shows that (1) abnormal alarm shows that (2) balance adjustment selector button and balance show (3), tool housing leaves the circular hole (4) that is used for the regulating circuit balance, tool housing leaves wiring hole (5), it is characterized in that: each element circuit of electric energy metrical monitor and circuit connecting relation thereof are: current transformer LH parameter sampling circuit output end is connected with the input end that compares output circuit, and current transformer LH parameter sampling circuit is at adjustable impedance element LX of each loop serial connection of current transformer LH ₁, LX ₂, LX ₃, be connected in a high frequency oscillator U in parallel ₁Three high-frequency signal output terminal F ₁, F ₂, F ₃On, high frequency oscillator U1 applies a high-frequency signal for each loop of current transformer LH, and the HF voltage that each current transformer LH inducts is connected with the Hi-pass filter input end, and output terminal is connected with wave detector, is converted to a millivolt step voltage E after the detection _A, E _B, E _COutput, output terminal is connected with the input end that compares output circuit; Current transformer LH parameter sampling circuit is the voltage E of each current return _A, E _B, E _CSend into the input end of comparison output circuit, be connected, after relatively, export the input end that an indication level is delivered to the next stage logic judging circuit with the voltage comparator input end of setting; When current transformer LH parameter sampling circuit output end was connected with comparison output circuit input end, it also was connected with the input end of a current/voltage IV comparator circuit, and current transformer LH parameter sampling circuit is with each loop LH of current transformer LH _a, LH _b, LH _cIn the 50H that inducts _zLow-frequency voltage is connected with low-pass filter one end, sends into the voltage comparator input end behind the amplitude limit, compares the back outputs level signals, sends into an input end of current/voltage IV comparator circuit; The phase sequence check circuit is differentiated phase sequence with line of electric force A, B, C phase voltage or from the input end that the three-phase voltage that voltage transformer (VT) YH takes out is sent into testing circuit, and output terminal is connected with another input end of next stage current/voltage IV comparator circuit; Current/voltage IV comparator circuit input end is connected with an output terminal of current transformer LH parameter sampling circuit, the output terminal of phase sequence check circuit respectively, common access conditions of level signal that the reflected load electric current that the reflected load of phase sequence check circuit has or not the level signal of phase voltage to export with current transformer LH parameter sampling circuit has or not and two input ends of door, be connected with the input end of the logic judging circuit of next stage with the output terminal of door, also export another input end of sending into logic judging circuit by the misphase fault-signal of phase sequence check circuit input; The input end of logic judging circuit is connected with the output terminal that compares output circuit output terminal and current/voltage IV comparator circuit respectively, send into the input end of logic judging circuit by current return and the detected short circuit of voltage circuit, open circuit, phase shortage, the unification of misphase fault, the output terminal of logic judging circuit is connected with the input end of timer circuit, logic judging circuit removes the fault level of combination to open the control gate of timer, accumulative total fault-time; The output terminal of time generating circuit is connected with an input end of logic judging circuit, and time generating circuit is just exported the control gate that a pulse removes to close timer at set intervals; Power supply and standby power supply circuit provide stable DC voltage for circuitry; The input end that detects control circuit at interval is connected with standby power supply with an output terminal of time generating circuit respectively, the output terminal that detects control circuit at interval is connected with the comparison output circuit with current transformer LH parameter sampling circuit respectively, after exchanging power failure, standby power supply work, detect control circuit at interval off and on to current transformer LH parameter sampling circuit and relatively output circuit power supply, carry out the interval and detect; Balance adjustment circuit is connected with current transformer LH parameter sampling circuit, regulates the adjustable impedance element LX of current transformer LH parameter sampling circuit respectively ₁, LX ₂, LX ₃Realize balance.And by the demonstration of the balance on the instrument panel (3) demonstration.

2, electric energy metrical monitor according to claim 1, it is characterized in that: on the tool housing panel, be provided with abnormal alarm and show (2), output terminal at logic judging circuit connects a warning circuit, and fault-signal shows that by abnormal alarm on the panel (2) show.

3, electric energy metrical monitor according to claim 1 is characterized in that: in the described current transformer LH parameter sampling circuit, and high frequency oscillator U ₁Comprise three identical circuit, the base stage of triode BG connects 2 divider resistance RB in each circuit ₁, RB ₂, the emitter of triode BG connects an emitter resistance RE, capacitor C ₁And C ₂Serial connection back and inductance L also are connected to the collector of triode BG, capacitor C ₁And C ₂Contact is drawn a lead and is connected capacitor C with triode BG emitter _DOne end and triode emitter and capacitor C ₁, C ₂The connection lead of contact connect other end output high-frequency signal.

4, electric energy metrical monitor according to claim 1 is characterized in that described its input end of current/voltage IV comparator circuit comprises three and the AND circuit U that connects ₁₀: A, U ₁₀: B, U ₁₀: C, by the reflected load of current transformer LH parameter sampling circuit output have currentless outputs level signals divide three-phase respectively with door U ₁₀: A, U ₁₀: B, U ₁₀: the input end of C connects; Reflected load by the output of phase sequence check circuit has or not the positive half-wave of phase voltage to divide three-phase to be connected with integrating circuit one end respectively, and output terminal is sent into three not gate U ₄: C, U ₄: B, U ₄: the input end of A, the output terminal of three not gates are respectively with three and a door U ₁₀: A, U ₁₀: B, U ₁₀: another input end of C connects, three with output terminal and one or a U ₁₁: the input end of B connects, level signal by or door U ₁₁: B outputs to the input end of next stage logic judging circuit.

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