CN2269020Y

CN2269020Y - Electric power monitor

Info

Publication number: CN2269020Y
Application number: CN 96204827
Authority: CN
Inventors: 祝保江
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-03-25
Filing date: 1996-03-25
Publication date: 1997-11-26
Anticipated expiration: 2006-03-25

Abstract

The utility model relates to an electric power monitor used for the remote control of power cut, power transmission of basic power distribution stations, automatic protection, alarm, etc. The utility model is composed of a master control board and a slave board, wherein, the slave board controls power cut and power transmission of a transformer by an AC contactor; the master control board comprises a phase voltage monitoring and sampling circuit, a phase voltage failure signal generating circuit, a function transfer switch circuit, a remote control power transmission circuit, a remote control power cut circuit, a creepage detecting circuit, a failure alarm circuit, etc.; the slave board comprises a power transmission and a power cut control circuits and a power cut and power transmission signal conversion circuit. AC high voltage is generated at the ground lead end of the master control board during both the remote control of power transmission and the remote control of power cut, and the ground lead end of the slave board receives the AC high voltage and controls the contactor or a release to operate by corresponding circuits.

Description

Power monitor

The utility model relates to the power monitor in a kind of distribution board or power station, is used to control to the transmission or not of transformer or error protection etc.

The circuit supervision facility of current China power equipment lacks relatively, particularly basic unit's low-voltage circuit lacks the fairly perfect and lower-cost watch-dog of function especially, in the electric power system of reality, mostly also rest on and adopt hand switch by the power transformer transmission or not of A.C. contactor outside certain distance, owing to not finding in time that fault incurs loss through delay the incident of processing generation is often arranged, sometimes even cause casualties and economic loss.

The purpose of this utility model is to design a kind of power monitor for the power distribution station electrician of basic unit; be applicable to the power monitor of 220V, 380V three-phase transformer; can do far away, in-plant remote control transmission or not; in circuit excess load or phase shortage or short circuit or electric leakage or all power-failure protecting or warnings automatically when having the people to steal to cut electric wire, protect electric power facility also to make things convenient for work about electric power person on the other hand, increase work efficiency on the one hand.

Power monitor of the present utility model, comprise master control borad and controlled plate, master control borad comprises that the phase voltage that is connected with phase line respectively monitors that sample circuit, remote control send circuit, remote control power failure circuit and electric-leakage detection circuit, controlled plate comprises A.C. contactor, power transmission control circuit that is connected with ac contactor coil and the power failure control circuit that is connected with trip coil of being with release, ac contactor contact is serially connected between the transformer frequency response circuit, it is characterized in that:

Described master control borad also includes the phase voltage defect signal generating circuit, function switch circuit and fault warning circuit, phase voltage defect signal generating circuit input connects phase voltage respectively and monitors sample circuit, phase voltage defect signal generating circuit output is the common port of connection function conversion switch circuit related switch respectively, the common port of electric-leakage detection circuit output connection function conversion switch circuit one switch, the automatic protection of function switch circuit or warning selecting side connect remote control power failure circuit one input and fault warning circuit one input respectively, and sending of circuit and remote control power failure circuit sent in remote control, the power cut signal output connects ground terminal;

Described controlled plate also includes and send, the power cut signal change-over circuit, send power cut signal change-over circuit output to connect power transmission control circuit and power failure control circuit input respectively, send, power cut signal change-over circuit input grounding line end.

The phase voltage defect signal generating circuit of described master control borad is a relay circuit, and relay coil connects described phase voltage and monitors sample circuit output, and relay contact group output fault-signal connects described function switch circuit.

It is a self-excited oscillator that is linked in sequence and is constituted by DC power supply, start button, resitstance voltage divider, transformer, transistor that circuit is sent in the remote control of described master control borad, and transformer secondary output coil two ends are earth connection and zero line respectively.

The remote control power failure circuit of described master control borad is an autotransformer, and the transformer coil two ends are connecting to neutral line and ground wire respectively, and the transformer centre tap connects the automatic protection selecting side of described function switch.

The fault warning circuit of described master control borad is made of transformer, the audio power amplifier circuit and the loud speaker thereof that are connected with the transformer secondary output coil, and the transformer two ends are the alarm selecting side of connecting to neutral line and described function switch respectively.

Sending of described controlled plate, the power cut signal change-over circuit is by first transformer, second transformer and relay constitute, described electricity or the power failure control circuit of sending is made of ac-dc conversion circuit connection relay circuit, the secondary coil of first transformer connects the ac voltage input of power failure control circuit, the secondary coil of second transformer connects the ac voltage input of power transmission control circuit, first transformer, one end and relay coil one termination ground terminal, another termination release mechanical arm switch one side one end of first transformer, this side other end of mechanical arm switch connects mechanical arm switch opposite side one end and second transformer coil, one end and zero line side, the second transformer other end is succeeded appliance contact one end, the relay contact of another termination power failure control circuit of relay contact send, the relay contact of power failure control circuit connects ac contactor coil and trip coil respectively.

Each can select electric power protection automatically or alarm respectively or turn-off monitoring by the function switch circuit, and detection of electrical leakage also can be selected protection automatically or alarm or turn-off monitoring by the function switch circuit.Start master control borad and send eletric button, remote control send circuit self-excitation generation ac high-voltage signal to incorporate ground into, controlled plate from ground terminal receive this ac high-voltage signal by give, power cut signal change-over circuit control connects power transmission control circuit, makes the A.C. contactor action, power transformer can send to the user.Break down mutually or when having electric leakage and function switch to select protection automatically when arbitrary; it is phase voltage that the function switch circuit of master control borad all can make the bootstrapping transformer centre tap of remote control power failure circuit; its ground terminal bootstrapping generates ac high-voltage and incorporates ground into; controlled plate receives this ac high-voltage signal from ground terminal; by sending; the power failure control circuit is connected in the control of power cut signal change-over circuit; make the release action; the A.C. contactor outage stops to send to the user; and when function switch is selected to report to the police, then when fault being arranged or electric leakage is arranged, send alarm call by the fault warning circuit.

The utility model between master, controlled plate apart from not specially provided for, produce remote control transmission or not control signal by ground terminal.Except there being fault to protect automatically, leak electricity automatically protection and the warning function, also has the remote control function of sending, have a power failure.

Further specify technology of the present utility model below in conjunction with the embodiment accompanying drawing

Fig. 1, master control borad structural principle block diagram

Fig. 2, controlled plate structure theory diagram

Fig. 3, master control borad are implemented electrical schematic diagram

Fig. 4, the controlled firm and hard electrical schematic diagram of executing

Referring to Fig. 1, A, B among the figure, C, O ,-be respectively triple line, zero line and ground wire.101,102,103 be respectively phase voltage supervision sample circuit, 104,105,106 be respectively the phase voltage defect signal generating circuit, 108 be the function switch circuit, 107 for electric-leakage detection circuit, 109 for the fault warning circuit, 110 are remote control power failure circuit, 111 send electric circuit for remote control.

Press remote control and send the start button in the circuit 111 to make remote control send circuit 111 to get electric work generation self-oscillation, its ground terminal has ac high-voltage, sends to controlled plate and send the signal of telecommunication.When between zero line and ground wire electrical leakage voltage being arranged, electric-leakage detection circuit 107 is sent electric leakage signal to function switch circuit 108; When arbitraryly breaking down (open circuit, short circuit, overload etc.) mutually; phase voltage monitors sample circuit 101 or the corresponding phase voltage defect signal generating circuit of 102 or 103 controls; make output one fault-signal give function switch circuit 108; this fault-signal or 109 work of electric leakage signal driving malfunction warning circuit when selecting automatic warning function; this fault-signal or electric leakage signal drive remote control power failure circuit 110 again when selecting automatic protection functions; its ground terminal has ac high-voltage, sends power cut signal to controlled plate.

Referring to Fig. 2, among the figure 201 for give, the power cut signal change-over circuit, 202 is power transmission control circuit, 204 is ac contactor coil, 203 for the power failure control circuit, 205 is trip coil.The remote control power failure of ground terminal or remote control send the signal of telecommunication by give, power cut signal change-over circuit 201 guides respectively and gives power transmission control circuit 202 or power failure control circuit 203, the action of controlling A.C. contactor 204 or release 205 respectively realizes sending, having a power failure.

Referring to Fig. 3, circuit is with circuit, Therefore, omited as space is limited in the frame of broken lines 101 in the frame of broken lines 102,103.Zero line side 0 links to each other among the figure, ground terminal-link to each other.

Transformer B1, diode D1, capacitor C 1, C2, potentiometer W1, resistance R 1, transistor BG1, BG2 constitute the A phase voltage and monitor sample circuit 101 (102,103).Relay J 1, J2, J3 are respectively phase voltage defect signal generating circuit 104,105,106.When three-phase electricity all just often, the equal adhesive action of J1, J2, J3 then recovers static state (as shown in FIG.) with this corresponding relay when arbitrary when mutually fault being arranged.L1 is the phase voltage indicator light among the figure, and VACI is a voltmeter.K1, K2, K3, K4 composition function conversion switch circuit 108; wherein K1-K3 is the three-phase electricity function switch, and K4 is the detection of electrical leakage function switch, is protection automatically when switch is in 1 position; for alarm automatically, be that function is closed when being in 3 positions when being in 2 positions.When three-phase electricity all just often, J1-J3 is adhesive, the common port of K1-K3 is unsettled, fault-signal line N goes up no-voltage.But working as arbitrary phase or two-phase breaks down; pairing relay can not move in adhesive; but as long as one electric pairing relay is arranged mutually is adhesive action; it is phase voltage that a common port is always arranged among the K1-K3; voltage (phase voltage) is just arranged on the fault-signal line N when then protecting automatically, on the M line phase voltage is arranged all under above-mentioned two kinds of situations.

Transformer B4, integrated U1 of audio frequency power amplifier (LA4160) and loud speaker y connect and compose fault warning circuit 109, when K1-K3 is in position 2, phase voltage on the switch common port is added to transformer B4 primary coil one end, constitute power path with the zero line side O of the coil other end, fault warning is sent in U2 work.

Power supply EC stops sending electric safety lock K5, send eletric button K6, and resistance R 2, R3, R4, transformer B5, transistor BG3-BG7 connect into self-maintained circuit and constitute remote control and send circuit 111.For guaranteeing that personal safety being provided with stop sending electric safety lock K5, shown position is locked.Button switch K 7 is the power failure button, when removing the locking states of K5 and pressing K6, circuit gets electric self-excitation, and the alternating voltage that produces the nearly 200V of 50～100HZ on the secondary coil of B5 is incorporated ground (the transformer B5 secondary coil other end is by J4 fixed contact connecting to neutral line) into, sends to controlled plate and send the signal of telecommunication.

Transformer B6 one termination ground wire other end connecting to neutral line constitutes remote control power failure circuit 110; when on being in automatic guard mode and fault-signal line N, phase voltage being arranged; the centre tap of transformer and phase line are connected; the B6 Bootstrap; the coil ground terminal has the alternating voltage of approximate 500V to incorporate ground into, sends power cut signal to controlled plate.Push K7 M line and N line are connected, B6 gets electric work, can manually control remote control and have a power failure.

Diode bridge D2-D5, capacitor C 3, relay J 4, J5 connect and compose electric-leakage detection circuit 107; diode bridge input two ends difference connecting to neutral line (through K7, K6) and ground wire (through the J5 fixed contact) are when having electric leakage between zero line and ground wire; J4 action J5 action; phase voltage on the M line is added to the common port of K4; when being in automatic protective position, K4 then controls remote control power failure circuit (B6), then control fault warning circuit work (B4 etc.) when K4 is in automatic warning position by fault-signal line N.

Referring to Fig. 4, CZI is the ac contactor contact part among the figure, and CZ2-1 is the ac contactor coil part, and CZ1-2 is the trip coil part, and CZ1-3 is the release mechanical arm, and position shown in the figure is a power down mode.

Relay J 8, transformer B7, B8 formation is sent, power cut signal change-over circuit 201, when transformer B8 gets electric through D7, D8 full-wave rectification, C5 filtering (the C5 charging also has certain delayed action) makes J7 action adhesive, C mutually the electricity through J7 moving contact, CZ1-1 coil to the B phase, ac contactor contact CZ1 adhesive is to user's upwards action (A ' B ' C ' connects power transformer among the figure) of release mechanical arm CZ1-3 simultaneously of powering.B7 gets when transformer, through effects such as the rectification of D6, C7, C4, R5, C6, BG8, BG9, filtering, samplings, make J6 adhesive action, the moving contact of the electric mutually fixed contact through J7 of C, J6, CZ1-2 coil are to the B phase, and release CZ1-3 action downwards reverts to shown position.To send the signal of telecommunication be that ground terminal is when having the alternating voltage of nearly 200V, 50-100HZ when master control borad is sent remote control, ground terminal constitutes electric power loop through J8 coil, CZ1-3 contact to zero line, J8 adhesive action, zero line through B8 primary coil, J8 contact, J6 fixed contact, J7 fixed contact to C mutually, B8 gets and electricly makes ac contactor coil CZ1-1 get electric and adhesive action, control is sent electricity to the user, in case A.C. contactor adhesive action this moment is jumped (shown in arrow among the figure) and blocked on its mechanical arm.

Sending the remote control power cut signal when master control borad is that ground terminal is when having the alternating voltage of nearly 500V, because of having gone up, CZ1-3 jumps so the J8 akinesia, ground wire through B7 primary coil, CZ1-3 contact to the O line, make B7 get electric J6 action, trip coil CZ1-2 gets electronic work, cut off A.C. contactor CZ1 contact and stop to send electricity to the user, release mechanical arm CZ1-3 jumps down and reverts to shown position simultaneously, and the signal of telecommunication is sent in the wait remote control.

Power monitor of the present utility model; be mainly used in the remote control transmission or not of power transformer; the person that fatal risk is arranged got an electric shock protect, can prevent to cut device damage that various faults such as electric wire cause and fire etc., also can make fault alarm because of short circuit, electric leakage, phase shortage, robber.

Can remain on 1-2 in second the operate time of the protection of this device embodiment excess load, open-phase protection, short-circuit protection, and the robber cuts the electric wire time of fire alarming and can make in 1 second, and arbitrary phase is leaked electricity electrical ground and can be protected automatically in 1 second or report to the police.Can improve the particularly electrical safety of rural area of basic unit power station, and provide convenience for work about electric power person, increase work efficiency.

Claims

1, a kind of power monitor, comprise master control borad and controlled plate, master control borad comprises that the phase voltage that is connected with phase line respectively monitors that sample circuit, remote control send circuit, remote control power failure circuit and electric-leakage detection circuit, controlled plate comprises A.C. contactor, power transmission control circuit that is connected with ac contactor coil and the power failure control circuit that is connected with trip coil of being with release, ac contactor contact is serially connected between the transformer frequency response circuit, it is characterized in that:

2, power monitor according to claim 1, it is characterized in that: the phase voltage defect signal generating circuit of described master control borad is a relay circuit, relay coil connects described phase voltage and monitors sample circuit output, and relay contact group output fault-signal connects described function switch circuit.

3, power monitor according to claim 1, it is characterized in that: it is a self-excited oscillator that is linked in sequence and is constituted by DC power supply, start button, resitstance voltage divider, transformer, transistor that circuit is sent in the remote control of described master control borad, and transformer secondary output coil two ends are earth connection and zero line respectively.

4, power monitor according to claim 1; it is characterized in that: the remote control power failure circuit of described master control borad is an autotransformer; the transformer coil two ends are connecting to neutral line and ground wire respectively, and the transformer centre tap connects the automatic protection selecting side of described function switch.

5, power monitor according to claim 1, it is characterized in that: the fault warning circuit of described master control borad is made of transformer, the audio power amplifier circuit and the loud speaker thereof that are connected with the transformer secondary output coil, and the transformer two ends are the alarm selecting side of connecting to neutral line and described function switch respectively.

6, power monitor according to claim 1, it is characterized in that: the sending of described controlled plate, the power cut signal change-over circuit is by first transformer, second transformer and relay constitute, described electricity or the power failure control circuit of sending is made of ac-dc conversion circuit connection relay circuit, the secondary coil of first transformer connects the ac voltage input of power failure control circuit, the secondary coil of second transformer connects the ac voltage input of power transmission control circuit, first transformer, one end and relay coil one termination ground terminal, another termination release mechanical arm switch one side one end of first transformer, this side other end of mechanical arm switch connects mechanical arm switch opposite side one end and second transformer coil, one end and zero line side, the second transformer other end is succeeded appliance contact one end, the relay contact of another termination power failure control circuit of relay contact send, the relay contact of power failure control circuit connects ac contactor coil and trip coil respectively.