CN108711931B - Controllable composite power supply three-phase alternating current electric switch machine phase failure protector - Google Patents

Controllable composite power supply three-phase alternating current electric switch machine phase failure protector Download PDF

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Publication number
CN108711931B
CN108711931B CN201810663236.1A CN201810663236A CN108711931B CN 108711931 B CN108711931 B CN 108711931B CN 201810663236 A CN201810663236 A CN 201810663236A CN 108711931 B CN108711931 B CN 108711931B
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circuit
power supply
current
power
phase
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CN108711931A (en
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杨晓强
李涛
李立辉
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Liuzhou Chentian Technology Co ltd
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Liuzhou Chentian Technology Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/066—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems characterised by the use of dynamo-electric machines
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Control Of Voltage And Current In General (AREA)

Abstract

The phase failure protector comprises a power supply unit, a control unit, a driving unit and a current sampling unit, wherein the power supply unit comprises a power supply module I, a power supply module II and a power supply control module, the input ends of the power supply module I and the power supply module II are respectively connected with a three-phase alternating current circuit through a current transformer and a power taking transformer, and the output ends of the power supply module I and the power supply module II are connected with the driving unit, the control unit and the power supply control module; the current sampling unit is connected with the three-phase alternating current circuit, the control unit is respectively connected with the current sampling unit, the driving unit and the power supply control module, and the output end of the driving unit is connected with the protective relay of the action circuit of the electric switch machine; the phase-failure protector has 2 power supply modules, the power supply is reliable and flexible, if one of the power supply modules fails in the action process of the switch machine, the phase-failure protector cannot lose power, and the power supply module II is controlled by the processor and can maintain whether the phase-failure protector continuously works or not according to the requirement.

Description

Controllable composite power supply three-phase alternating current electric switch machine phase failure protector
Technical Field
The invention relates to a circuit protection device, in particular to a three-phase alternating current electric switch machine phase-failure protector suitable for controllable compound power supply of railway lines.
Background
The railway line changes the running path of the train through the turnout, and the equipment for changing the turnout position is called a point machine; according to different action power sources, the direct current electric switch machine and the alternating current electric switch machine are divided; when the phase of the three-phase power supply is broken, the current of the other two phases is rapidly increased, so that the windings of the three-phase motor are burnt out due to overhigh temperature rise, and therefore, in a turnout action circuit of the alternating-current electric switch machine, a broken-phase protector is arranged, and when the phase is broken, the action power supply of the switch machine is timely cut off through a protection relay, so that the three-phase motor is protected from being damaged (see fig. 2 and fig. 3).
At present, from the power taking technology, three main types of phase failure protectors used on railways are:
firstly, three current transformers are used for taking electricity from working current, the secondary sides of the three current transformers are connected in series, three voltages are generated through a current-to-voltage circuit, and then the three voltages are subjected to vector superposition to generate a voltage, and the voltage is directly driven to enable a protective relay to be sucked up after rectification and filtering;
Secondly, one or more current transformers are used for taking electricity from working current, the electricity is rectified to supply power for the control unit, and whether the driving output of the electricity is controlled by the control unit or not;
and thirdly, one or more power transformers are used for providing working power for the driving circuit, required low voltage is obtained from 380V working voltage through the transformers, and the low voltage is provided for the driving circuit of the logic circuit and the protection relay after rectification, filtering and voltage stabilization.
The three main types of phase failure protector have the following defects:
1. the power supply mode is single, and the reliability is low; whether the mutual inductor is used for taking electricity or the electricity is taken through the voltage of any two phases in 380V, the power supply mode is only single current or voltage, the interference resistance of the single power supply mode is poor, the reliability of the power supply module is poor, and when the power supply module fails, the whole system is invalid;
2. for the mode of using the current transformer to get electricity, the following disadvantages exist:
(1) When a large current (load overload, power short circuit) is caused, the large current will cause the primary side overload of the current transformer;
(2) When the switch machine stops working, the whole system is powered off, so that the system can only provide simple protection functions during the working period of the switch machine, but cannot realize more complex advanced functions such as redundancy control, electric quantity display, data recording, action current analysis, historical data inquiry, data transmission and the like;
3. For a power supply mode that uses one or more power transformers to draw power from a 380V power supply, the following disadvantages exist:
(1) When the voltage is large (voltage rise and thunder), the primary side of the transformer for taking the voltage is over-voltage to cause faults;
(2) Because the power transformer is connected with a 380V working power supply for a long time, lightning can cause damage to the power taking module through the 380V power supply, so that the phase failure protector cannot work.
Disclosure of Invention
The invention aims to provide a controllable composite power supply three-phase alternating current electric switch machine phase-failure protector, which overcomes the defects existing in the prior art and improves the reliability and usability of the phase-failure protector.
The technical scheme adopted by the invention is as follows:
a controllable compound-powered three-phase alternating current electric switch machine phase-failure protector, which is connected with an electric switch machine action circuit to provide phase-failure protection for the electric switch machine action circuit; the phase failure protector comprises a power supply unit, a control unit, a driving unit and a current sampling unit, wherein a power taking circuit of the power supply unit is connected with a three-phase alternating current circuit for providing working power for the switch machine, and the output end of the power supply unit is respectively connected with the control unit and the driving unit to provide working power for the switch machine;
The power supply unit comprises a power supply module I, a power supply module II and a power supply control module, wherein the input end of the power supply module I is connected with a three-phase alternating current circuit through a current power taking circuit, and the output end of the power supply module I is respectively connected with the driving unit, the control unit and the power supply control module; the input end of the power supply module II is connected with the three-phase alternating current circuit through the voltage power taking circuit, and the output end of the power supply module II is respectively connected with the driving unit, the control unit and the power supply control module;
the output end of the control unit is connected with an external detecting instrument or a system host;
the driving unit is used for receiving the instruction of the control unit, driving and outputting the protection relay of the action circuit of the electric switch machine to act, and stopping outputting the protection relay of the action circuit of the electric switch machine to stop acting when the three-phase alternating current circuit is out of phase;
The current sampling unit is used for performing isolated sampling on the three-phase alternating current circuit and sending sampling data to the control unit for processing;
the control unit is used for:
1) Processing the signal from the current sampling unit: the method comprises the steps of phase failure judgment, shunt power supply management, alarm, information display and detection of driving voltage of a driving unit;
2) After the power supply module I is started, a start power-taking control signal or a stop power-taking control signal is provided for the power supply control module, so that the working state of the power supply module II is controlled;
the power supply module I is used for taking electricity from the three-phase alternating current circuit through the current taking circuit when the switch machine starts to act, converting working current into alternating current voltage, and providing working power for the control unit, the driving unit and the power supply control module after the working current is converted into direct current voltage through rectification;
the power supply module II is used for taking power from the three-phase alternating current circuit through the voltage taking circuit after being started under the control of the power supply control module, converting the obtained 380V power supply into alternating current low voltage, and providing working power for the control unit, the driving unit and the power supply control module after being converted into direct current voltage through rectification;
the power supply control module is used for: after the power supply module I is started, the working state of the power supply module II is controlled according to the start power taking control signal or the stop power taking control signal provided by the control unit, and the primary of a power taking transformer of the power supply module II is connected with a 380V power supply or disconnected, so that the power supply module I and the power supply module II are output and combined into a redundant composite power supply system, and the working power supply is provided for the control unit, the driving unit and the power supply control module.
The further technical scheme is as follows:
the control unit comprises a processor, a comprehensive power supply circuit, a signal conditioning circuit, a driving voltage detection circuit, a display circuit, a communication circuit and an alarm circuit;
the processor is connected with the power supply module I and the power supply module II through the integrated power supply circuit, is connected with the current sampling unit through the signal conditioning circuit, is connected with the driving unit through the driving voltage detection circuit, is respectively connected with the power supply control module and the driving unit through the first control end and the second control end, is respectively connected with the power supply control module and the driving unit, is respectively connected with the display circuit, the communication circuit and the alarm circuit at the internal control end of the processor, and is connected with an external detection instrument or a system host at the output end of the communication circuit;
the processor is used for carrying out digital filtering, logic operation, power supply control, automatic driving voltage adjustment, current voltage display, alarm control and communication control on the current sampling signal;
the integrated power supply circuit is used for providing working power supply for each circuit in the control unit;
the signal conditioning circuit is used for filtering, amplifying and performing current-voltage conversion on the current signal from the current sampling unit so as to obtain a measurable voltage signal, and transmitting the measurable voltage signal to the analog-to-digital converter in the processor;
The driving voltage detection circuit is used for detecting the working voltage of the driving unit, feeding back the detection value to the processor, and adjusting the driving unit by the processor according to the feedback value to change the output of the driving voltage;
the display circuit is used for displaying the working current value and the driving voltage value of the three-phase alternating current circuit;
the communication circuit is used for transmitting the current, voltage and working state information of the open-phase protector to an external detecting instrument or system host;
the alarm circuit is used for alarming abnormal conditions of open phase of the three-phase alternating current circuit, unbalanced three-phase current and abnormal driving voltage;
the power supply module I comprises a current power taking circuit, a rectifying circuit I and a voltage stabilizing circuit I; the current power taking circuit is connected with the three-phase alternating current circuit through a primary coil of the current transformer, the output end of the current power taking circuit is connected with the input end of the rectifying circuit I, the output end of the rectifying circuit I is connected with the input end of the voltage stabilizing circuit I, and the output end of the voltage stabilizing circuit I provides a working power supply for the control unit, the driving unit and the power supply control module;
the power supply module II comprises a voltage power taking circuit, a rectifying circuit II and a voltage stabilizing circuit II; the voltage power taking circuit is connected with the three-phase alternating current circuit through a normally open contact of the power taking transformer and the power taking control relay, the output end of the voltage power taking circuit is connected with the input end of the rectifying circuit II, the output end of the rectifying circuit II is connected with the input end of the voltage stabilizing circuit II, and the output end of the voltage stabilizing circuit II provides a working power supply for the control unit, the driving unit and the power supply control module;
The power supply control module comprises a power taking control relay, wherein the power taking control relay is an electromagnetic relay, a reed switch relay, a solid-state relay or an optical relay.
The further technical scheme is as follows:
the power supply module II is a controlled power supply module, and the working mode of the power supply module II is an intermittent working mode or a continuous working mode, and is controlled by a control unit or directly controlled by a circuit or controlled by a timer.
Further:
the power supply control module comprises a power taking control relay, a 2 nd electrolytic capacitor, a 3 rd voltage stabilizing diode, an 8 th diode, a 3 rd resistor, a 4 th resistor, a 5 th resistor, a 6 th resistor, a 3 rd triode, a 4 th triode and a field effect transistor;
the source electrode of the field effect transistor is connected with one end of the 5 th resistor and then is connected with the first power supply output ends of the power supply module I and the power supply module II, the gate electrode of the field effect transistor is connected with the other end of the 5 th resistor and then is connected with the collector electrode of the 4 th triode, the emitter electrode of the 4 th triode is grounded, the base electrode of the 4 th triode is connected with the 6 th resistor, and the other end of the 6 th resistor is connected with the first control end of the control unit processor and receives a start power-on control signal or a stop power-on control signal;
the drain electrode of the field effect transistor, one end of the 3 rd resistor and the collector electrode of the 3 rd triode are connected with the anode of the 2 nd electrolytic capacitor, and the other end of the 3 rd resistor is connected with the base electrode of the 3 rd triode and the reverse end of the 3 rd zener diode;
The emitter of the 3 rd triode is connected with one end of the 4 th resistor, the other end of the 4 th resistor is connected with the negative electrode of the 2 nd electrolytic capacitor, and then is connected with the reverse end of the 8 th diode and one end of the power-taking control relay coil;
the forward end of the 3 rd voltage stabilizing diode, the forward end of the 8 th diode, the emitter of the 4 th triode and the other end of the power-taking control relay coil are grounded.
Still further:
the voltage sampling circuit of the power supply module II comprises a power taking transformer, a 1 st fuse, a 1 st piezoresistor and a normally open contact of the power taking control relay, wherein the two ends of the 1 st piezoresistor are connected in parallel with the primary two ends of the power taking transformer, one end of the 1 st piezoresistor is connected to one phase of a three-phase power supply, the other end of the 1 st piezoresistor is connected with one end of the normally open contact of the 1 st fuse and the normally open contact of the power taking control relay in series, the other end of the normally open contact of the power taking control relay is connected with the other phase of the three-phase power supply, and the two ends of the secondary side of the power taking transformer are connected with the input end of the rectifying circuit II;
the rectifying circuit II of the power supply module II comprises a 1 st rectifying bridge and a 1 st electrolytic capacitor, two alternating current terminals of the 1 st rectifying bridge are connected with two output ends of the voltage power taking circuit, the positive electrode output end of the 1 st rectifying bridge is connected with the positive electrode of the 1 st electrolytic capacitor and the input end of the voltage stabilizing circuit II, and the negative electrode output end of the 1 st rectifying bridge is grounded;
The voltage stabilizing circuit II of the power supply module II comprises a 1 st resistor, a 1 st bidirectional transient suppression diode, a 1 st voltage stabilizing diode, a 1 st diode, a 2 nd diode and a 1 st triode;
one end of a 1 st bidirectional transient suppression diode, one end of a 1 st resistor, a collector of a 1 st triode and a positive end of a 1 st rectifier bridge are connected with the positive output end of the 1 st rectifier bridge, the other end of the 1 st resistor and the reverse end of the 1 st voltage stabilizing diode are connected with the base of the 1 st triode, and the other end of the 1 st bidirectional transient suppression diode and the positive end of the 1 st voltage stabilizing diode are grounded;
the emitter of the 1 st triode is connected with the forward end of the 2 nd diode, the reverse end of the 2 nd diode is used as a second power supply output end to supply power to the driving module, the collector of the 1 st triode is connected with the forward end of the 1 st diode, and the reverse end of the 1 st diode is used as a first power supply output end to supply power to the control unit and the power supply control module.
Still further:
the power supply module I comprises a first current taking circuit, a first rectifying circuit I and a voltage stabilizing circuit I;
the first current power taking circuit comprises a 1 st current transformer, a 2 nd piezoresistor and a 2 nd fuse, wherein the primary side of the 1 st current transformer is connected into one phase of the three-phase alternating current circuit, the 2 nd fuse is connected with the secondary side of the 1 st current transformer in series to form two output ends of the first current power taking circuit, the two output ends of the first current power taking circuit are connected with the input end of the first rectifying circuit I, and the 2 nd piezoresistor is connected between the two output ends of the first current power taking circuit in parallel;
The first rectifying circuit I comprises a 2 nd rectifying bridge, a 3 rd electrolytic capacitor and a 2 nd bidirectional transient suppression diode, two alternating current terminals of the 2 nd rectifying bridge are connected with two output ends of the first current power taking circuit, the positive electrode of the 2 nd rectifying bridge is connected with the positive electrode of the 3 rd electrolytic capacitor, one end of the 2 nd bidirectional transient suppression diode is used as an input end of the voltage stabilizing circuit I, and the negative electrode of the 3 rd electrolytic capacitor is grounded;
the voltage stabilizing circuit I comprises a 2 nd resistor, a 2 nd triode, a 3 rd diode and a 4 th diode; one end of a 2 nd bidirectional transient suppression diode, one end of a 2 nd resistor, the collector of a 2 nd triode and the positive end of a 4 th diode are connected with the positive output end of a 2 nd rectifier bridge, the other end of the 2 nd resistor and the reverse end of the 2 nd zener diode are connected with the base of the 2 nd triode, and the other end of the 2 nd bidirectional transient suppression diode and the positive end of the 2 nd zener diode are grounded;
the emitter of the 2 nd triode is connected with the forward end of the 3 rd diode, the reverse end of the 3 rd diode is connected with the second power supply output end of the power supply module II to supply power to the driving unit, the collector of the 2 nd triode is connected with the forward end of the 4 th diode, and the reverse end of the 4 th diode is connected with the first power supply output end of the power supply module II to supply power to the control unit and the power supply control module.
Still further:
the power supply module I also comprises a second current taking circuit and a second rectifying circuit I; the second current power taking circuit comprises a 2 nd current transformer, a 3 rd piezoresistor and a 3 rd fuse, wherein the primary side of the 2 nd current transformer is connected with the other phase of the three-phase alternating current circuit, the 3 rd fuse is connected with the secondary side of the 2 nd current transformer in series to form two output ends of the second current power taking circuit, the two output ends of the second current power taking circuit are connected with the input end of the second rectifying circuit I, and the 3 rd piezoresistor is connected between the two output ends of the second current power taking circuit in parallel;
the second rectifying circuit I comprises a 3 rd rectifying bridge, a 4 th electrolytic capacitor and a 3 rd bidirectional transient suppression diode, two alternating current terminals of the 3 rd rectifying bridge are connected with two output ends of the second current power taking circuit, the positive electrode of the 3 rd rectifying bridge is connected with the positive electrode of the 4 th electrolytic capacitor, one end of the 3 rd bidirectional transient suppression diode is used as an input end of the voltage stabilizing circuit I, and the negative electrode of the 4 th electrolytic capacitor is grounded;
the 5 th diode is connected in series between the first rectifying circuit I and the voltage stabilizing circuit I, and the 6 th diode is connected in series between the second rectifying circuit I and the voltage stabilizing circuit I.
Still further:
the power supply module I also comprises a third current taking circuit and a third rectifying circuit I; the third current taking circuit comprises a 3 rd current transformer, a 4 th piezoresistor and a 4 th fuse, wherein the primary side of the 3 rd current transformer is connected with the other phase of the three-phase alternating current circuit, the 4 th fuse is connected with the secondary side of the 3 rd current transformer in series to form two output ends of the third current taking circuit, the two output ends of the third current taking circuit are connected with the input end of a third rectifying circuit I, and the 4 th piezoresistor is connected between the two output ends of the third current taking circuit in parallel;
The third rectifying circuit I comprises a 4 th rectifying bridge, a 5 th electrolytic capacitor and a 4 th bidirectional transient suppression diode, two alternating current terminals of the 4 th rectifying bridge are connected with two output ends of the third current sampling circuit, the positive electrode of the 4 th rectifying bridge is connected with the positive electrode of the 5 th electrolytic capacitor and one end of the 4 th bidirectional transient suppression diode is used as an input end of the voltage stabilizing circuit I, and the negative electrode of the 5 th electrolytic capacitor is grounded;
the 7 th diode is connected in series between the third rectifying circuit I and the voltage stabilizing circuit I.
By adopting the technical scheme, the phase failure protector of the controllable composite power supply three-phase alternating current electric switch machine has the following beneficial effects:
1. the three-phase alternating current electric switch machine phase-failure protector with controllable compound power supply has high power supply reliability, and the power supply unit comprises two power supply modules, and when the switch machine acts or the current or the voltage is subjected to drastic change, if one of the power supply modules fails, the phase-failure protector cannot lose power;
(1) When the voltage is high (voltage overvoltage and thunder) and the primary side of the transformer is overvoltage and fails, the high voltage has no influence on the current transformer for current collection, the failure of the current transformer is avoided, and the power supply of the system can be ensured;
(2) When the current is large (load overload and power short circuit), if the primary side of the current transformer is overloaded and fails due to the large current, the current in the 380V loop has no influence on the voltage-powered transformer, and the transformer cannot fail;
2. the phase-failure protector has strong power supply flexibility, the power supply module II is connected with a three-phase alternating current power supply through the power taking transformer, and the power supply module II is controlled by the processor and can maintain the continuous operation or stop the operation of the phase-failure protector according to actual needs.
The technical characteristics of the three-phase alternating current electric switch machine phase failure protector with controllable composite power supply of the invention are further described below with reference to the accompanying drawings and the embodiments.
Drawings
Fig. 1: the invention relates to a structure block diagram of a controllable compound-powered three-phase alternating current electric switch machine phase failure protector;
fig. 2: the existing railway signal turnout phase failure protection device is a structural block diagram;
fig. 3: a control circuit diagram of the existing railway signal turnout open-phase protection device;
fig. 4: the invention relates to a control unit structure block diagram of a controllable compound power supply three-phase alternating current electric switch machine phase failure protector;
fig. 5: the invention relates to a circuit diagram of a controllable composite power supply three-phase alternating current electric switch machine open-phase protector (a power supply module I comprises a first current extraction circuit, a first rectifying circuit I and a voltage stabilizing circuit I);
Fig. 6: the circuit diagram of the three-phase alternating current electric switch machine open-phase protector with controllable compound power supply is provided in the second embodiment of the invention (the power supply module I comprises a first current sampling circuit, a first rectifying circuit I, a second current sampling circuit, a second rectifying circuit I and a voltage stabilizing circuit I);
fig. 7: the three-phase alternating current electric switch machine open-phase protector circuit diagram of the controllable compound power supply of the third embodiment of the invention (the power supply module I comprises a first current taking circuit, a first rectifying circuit I, a second current taking circuit, a second rectifying circuit I, a third current taking circuit, a third rectifying circuit I and a voltage stabilizing circuit I);
in fig. 1:
01-current sampling unit, 02-power supply module I, 03-power supply module II, 04-power supply control module, 05-control unit, 06-driving unit, 07-electric switch machine action circuit, BHJ-protection relay;
fig. 2 and 3:
i-phase failure protector, II-AC electric switch machine, 21-AC motor, 22-power conversion and contact set, BHJ-protection relay, 1 DQJ-first positioning operation relay, 1 DQJF-first positioning operation reset relay, 2 DQJ-second positioning operation relay, 2 DQJF-second positioning operation reset relay, DCA-key, FCA-key, KZ-control positive electricity, KF-control negative electricity;
In fig. 4:
051-a processor, 052-a comprehensive power supply circuit, 053-a signal conditioning circuit, 054-a driving voltage detection circuit, 055-a display circuit, 056-a communication circuit and 057-an alarm circuit;
fig. 5, 6, and 7:
c1-1 electrolytic capacitor, C2-2 electrolytic capacitor, C3-3 electrolytic capacitor, C4-4 electrolytic capacitor, C5-5 electrolytic capacitor;
r1-1 resistance, R2-2 resistance, R3-3 resistance, R4-4 resistance, R5-5 resistance, R6-6 resistance;
CT 1-1 current transformer, CT 2-2 current transformer, CT 3-3 current transformer;
RV 1-1 varistor, RV 2-2 varistor, RV 3-3 varistor, RV 4-4 varistor;
FU 1-1 st fuse, FU 2-2 nd fuse, FU 3-3 rd fuse, FU 4-4 th fuse;
BRI 1-1 st rectifier bridge, BRI 2-2 nd rectifier bridge, BRI 3-3 rd rectifier bridge, BRI 4-4 th rectifier bridge;
TVS 1-1 st TVS 2-2 nd TVS, TVS 3-3 rd TVS, TVS 4-4 th TVS;
d1-1 st diode, D2-2 nd diode, D3-3 rd diode, D4-4 th diode, D5-5 th diode, D6-6 th diode, D7-7 th diode, D8-8 th diode;
VD 1-1 st zener diode, VD 2-2 nd zener diode, VD 3-3 rd zener diode;
q1-1 st triode, Q2-2 nd triode, Q3-3 rd triode, Q4-4 th triode and Q5-field effect transistor;
t-electricity-taking transformer, KA-electricity-taking control relay.
Detailed Description
Example 1
A controllable compound-powered three-phase alternating current electric switch machine phase-failure protector, which is connected with an electric switch machine action circuit 07 to provide phase-failure protection for the same; the open-phase protector comprises a power supply unit, a control unit 05, a driving unit 06 and a current sampling unit 01, wherein a power taking circuit of the power supply unit is connected with a three-phase alternating current circuit for providing working power for the switch machine, and the output end of the power supply unit is respectively connected with the control unit and the driving unit to provide working power for the switch machine;
the power supply unit comprises a power supply module I02, a power supply module II 03 and a power supply control module (04), wherein the input end of the power supply module I02 is connected with a three-phase alternating current circuit through a current sampling circuit, the output end of the power supply module I is respectively connected with a driving unit, a control unit and the power supply control module, the input end of the power supply module II 03 is connected with the three-phase alternating current circuit through a voltage sampling circuit, and the output end of the power supply module II is respectively connected with the driving unit, the control unit and the power supply control module;
The input end of the current sampling unit 01 is connected with a three-phase alternating current circuit in an isolated mode, the output end of the current sampling unit 01 is connected with the control unit 05, the control unit is respectively connected with the power supply control module 04 and the driving unit 06 through a first control end and a second control end of the control unit, the output end of the driving unit is connected with a protection relay BHJ of an action circuit of the electric switch machine, and the communication output end of the control unit is connected with an external detecting instrument or a system host;
the driving unit 06 is configured to: receiving an instruction of the control unit, driving and outputting a protection relay BHJ of the electric switch machine action circuit to act, and stopping outputting the protection relay BHJ of the electric switch machine action circuit to stop acting when the three-phase alternating current circuit is out of phase;
the current sampling unit 01 is used for performing isolated sampling on the three-phase alternating current circuit and sending sampling data to the control unit for processing;
the control unit 05 is configured to:
1) Processing the signal from the current sampling unit: the method comprises the steps of phase failure judgment, shunt power supply management, alarm, information display and detection of driving voltage of a driving unit;
2) After the power supply module I is started, a start power-taking control signal or a stop power-taking control signal is provided for the power supply control module, so that the working state of the power supply module II is controlled;
The power supply module I02 is used for taking electricity from the three-phase alternating current circuit through the current taking circuit when the switch machine starts to act, converting working current into alternating current voltage, and providing working power for the control unit, the driving unit and the power supply control module after the working current is converted into direct current voltage through rectification;
the power supply module II 03 is used for: after the power supply control module is started under the control of the power supply control module, the power is taken from the three-phase alternating current circuit through the voltage taking circuit, the 380V power is converted into alternating current low voltage, and the alternating current low voltage is converted into direct current voltage through rectification to provide working power for the control unit, the driving unit and the power supply control module;
the power supply control module 04 is configured to: after the power supply module I is started, the working state of the power supply module II is controlled according to the start power taking control signal or the stop power taking control signal provided by the control unit, and the primary of a power taking transformer of the power supply module II is connected with a 380V power supply or disconnected, so that the power supply module I and the power supply module II are output and combined into a redundant composite power supply system, and the working power supply is provided for the control unit, the driving unit and the power supply control module.
The control unit 05 comprises a processor 051, a comprehensive power supply circuit 052, a signal conditioning circuit 053, a driving voltage detection circuit 054, a display circuit 055, a communication circuit 056 and an alarm circuit 057;
The processor 051 is connected with the power supply module I and the power supply module II through the integrated power supply circuit 052, is connected with the current sampling unit 01 through the signal conditioning circuit 053, is connected with the driving unit 06 through the driving voltage detection circuit 054, is respectively connected with the power supply control module through the first control end and the second control end and is respectively connected with the power supply control module 04 and the driving unit 06, the internal control end of the processor 051 is respectively connected with the display circuit 055, the communication circuit 056 and the alarm circuit 057, and the output end of the communication circuit 056 is connected with an external detection instrument or a system host;
the processor 051 is used for carrying out digital filtering, logic operation, power supply control, automatic driving voltage adjustment, current voltage display, alarm control and communication control on the current sampling signal;
the integrated power circuit 052 is used for providing working power for each circuit in the control unit;
the signal conditioning circuit 053 is used for filtering, amplifying and performing current-voltage conversion on the current signal from the current sampling unit so as to obtain a measurable voltage signal, and transmitting the measurable voltage signal to an analog-to-digital converter in the processor;
the driving voltage detection circuit 054 is used for detecting the working voltage of the driving unit, feeding back the detection value to the processor, and adjusting the driving unit by the processor according to the feedback value to change the output of the driving voltage;
The display circuit 055 is used for displaying the working current value and the driving voltage value of the three-phase alternating current circuit;
the communication circuit 056 is used for transmitting the current, voltage and working state information of the open-phase protector to an external detecting instrument or system host;
the alarm circuit 057 is used for alarming abnormal conditions of open phase of the three-phase alternating current circuit, unbalanced three-phase current and abnormal driving voltage;
the power supply module I02 comprises a current power-taking circuit, a rectifying circuit I and a voltage stabilizing circuit I; the current power taking circuit is connected with the three-phase alternating current circuit through a primary coil of the current transformer, the output end of the current power taking circuit is connected with the input end of the rectifying circuit I, the output end of the rectifying circuit I is connected with the input end of the voltage stabilizing circuit I, and the output end of the voltage stabilizing circuit I provides a working power supply for the control unit, the driving unit and the power supply control module;
the power supply module II 03 comprises a voltage power taking circuit, a rectifying circuit II and a voltage stabilizing circuit II; the voltage power taking circuit is connected with the three-phase alternating current circuit through a normally open contact of the power taking transformer T and the power taking control relay, the output end of the voltage power taking circuit is connected with the input end of the rectifying circuit II, the output end of the rectifying circuit II is connected with the input end of the voltage stabilizing circuit II, and the output end of the voltage stabilizing circuit II provides a working power supply for the control unit, the driving unit and the power supply control module;
The power supply control module 04 comprises a power taking control relay KA, wherein the power taking control relay is an electromagnetic relay, a reed switch relay, a solid state relay or an optical relay.
The power supply module II 03 is a controlled power supply module, and the working mode of the power supply module II is an intermittent working mode or a continuous working mode, and is controlled by a control unit or directly controlled by a circuit or controlled by a timer.
The power supply control module 04 comprises a power taking control relay KA, a 2 nd electrolytic capacitor C2, a 3 rd zener diode VD3, an 8 th diode D8, a 3 rd resistor R3, a 4 th resistor R4, a 5 th resistor R5, a 6 th resistor R6, a 3 rd triode Q3, a 4 th triode Q4 and a field effect transistor Q5;
the source electrode of the field effect transistor Q5 is connected with one end of a 5 th resistor R5 and then is connected with a first power supply output end of a power supply module I and a first power supply output end of a power supply module II, the gate electrode of the field effect transistor is connected with the other end of the 5 th resistor and then is connected with the collector electrode of a 4 th triode Q4, the emitter electrode of the 4 th triode Q4 is grounded, the base electrode of the 4 th triode is connected with a 6 th resistor R6, and the other end of the 6 th resistor is connected with a first control end of a control unit processor 051 and receives an on-off power taking control signal or a power taking stopping control signal;
the drain electrode of the field effect tube Q5, one end of the 3 rd resistor R3 and the collector electrode of the 3 rd triode Q3 are connected with the anode of the 2 nd electrolytic capacitor C2, and the other end of the 3 rd resistor R3 is connected with the base electrode of the 3 rd triode Q3 and the reverse end of the 3 rd zener diode VD 3;
The emitter of the 3 rd triode Q3 is connected with one end of a 4 th resistor R4, the other end of the 4 th resistor is connected with the cathode of the 2 nd electrolytic capacitor C2, and then is connected with the reverse end of the 8 th diode and one end of the power-taking control relay coil;
the forward end of the 3 rd zener diode VD3, the forward end of the 8 th diode D8, the emitter of the 4 th triode Q4, and the other end of the power-taking control relay coil are grounded.
The voltage sampling circuit of the power supply module II 03 comprises a power taking transformer T, a 1 st fuse FU1, a 1 st piezoresistor RV1 and a normally open contact of a power taking control relay KA;
the two ends of the 1 st piezoresistor RV1 are connected in parallel with the two ends of the primary of the power taking transformer, one end of the power taking transformer is connected to one phase of the three-phase power supply, the other end of the power taking transformer is connected in series with the 1 st fuse and one end of the normally open contact of the power taking control relay, the other end of the normally open contact of the power taking control relay is connected with the other phase of the three-phase power supply, and the two ends of the secondary of the power taking transformer are connected with the input end of the rectifying circuit II;
the rectifying circuit II of the power supply module II comprises a 1 st rectifying bridge BR I1 and a 1 st electrolytic capacitor C1, two alternating current terminals of the 1 st rectifying bridge are connected with two output ends of the voltage power taking circuit, the positive electrode output end of the 1 st rectifying bridge is connected with the positive electrode of the 1 st electrolytic capacitor and the input end of the voltage stabilizing circuit II, and the negative electrode output end of the 1 st rectifying bridge is grounded;
The voltage stabilizing circuit II of the power supply module II comprises a 1 st resistor R1, a 1 st bidirectional transient suppression diode TVS1, a 1 st voltage stabilizing diode VD1, a 1 st diode D1, a 2 nd diode D2 and a 1 st triode Q1;
one end of a 1 st bidirectional transient suppression diode, one end of a 1 st resistor, a collector of a 1 st triode and a positive end of a 1 st rectifier bridge are connected with the positive output end of the 1 st rectifier bridge, the other end of the 1 st resistor and the reverse end of the 1 st voltage stabilizing diode are connected with the base of the 1 st triode, and the other end of the 1 st bidirectional transient suppression diode and the positive end of the 1 st voltage stabilizing diode are grounded;
the emitter of the 1 st triode is connected with the forward end of the 2 nd diode, the reverse end of the 2 nd diode is used as a second power supply output end to supply power to the driving unit, the collector of the 1 st triode is connected with the forward end of the 1 st diode, and the reverse end of the 1 st diode is used as a first power supply output end to supply power to the control unit and the power supply control module.
The power supply module I02 comprises a first current taking circuit, a first rectifying circuit I and a voltage stabilizing circuit I; the first current power taking circuit comprises a 1 st current transformer CT1, a 2 nd piezoresistor RV2 and a 2 nd fuse FU2, wherein the primary side of the 1 st current transformer is connected into one phase of a three-phase alternating current circuit, the 2 nd fuse is connected with the secondary side of the 1 st current transformer in series to form two output ends of the first current power taking circuit, the two output ends of the first current power taking circuit are connected with the input end of a first rectifying circuit I, and the 2 nd piezoresistor is connected in parallel between the two output ends of the first current power taking circuit;
The first rectifying circuit I comprises a 2 nd rectifying bridge BR I2, a 3 rd electrolytic capacitor C3 and a 2 nd bidirectional transient suppression diode TVS2, two alternating current terminals of the 2 nd rectifying bridge are connected with two output ends of the first current power taking circuit, the positive electrode of the 2 nd rectifying bridge is connected with the positive electrode of the 3 rd electrolytic capacitor and one end of the 2 nd bidirectional transient suppression diode is used as an input end of the voltage stabilizing circuit I, and the negative electrode of the 3 rd electrolytic capacitor is grounded; the voltage stabilizing circuit I comprises a 2 nd resistor R2, a 2 nd triode Q2, a 3 rd diode D3 and a 4 th diode D4;
one end of the 2 nd bidirectional transient suppression diode, one end of the 2 nd resistor, the collector of the 2 nd triode and the positive end of the 4 th diode are connected with the positive output end of the 2 nd rectifier bridge, the other end of the 2 nd resistor and the reverse end of the 2 nd zener diode are connected with the base of the 2 nd triode, and the other end of the 2 nd bidirectional transient suppression diode and the positive end of the 2 nd zener diode are grounded.
The emitter of the 2 nd triode is connected with the forward end of the 3 rd diode, the reverse end of the 3 rd diode is connected with the second power supply output end of the power supply module II to supply power to the driving unit, the collector of the 2 nd triode is connected with the forward end of the 4 th diode, the reverse end of the 4 th diode is connected with the first power supply output end of the power supply module II to supply power to the control unit and the power supply control module.
Example two
The phase failure protector for three-phase AC electric switch machine with controllable composite power supply has basically the same structure as that of the first embodiment except that its power supply module includes the first current taking circuit, the first rectifying circuit, the second current taking circuit, the second rectifying circuit and the voltage stabilizing circuit.
The second current power taking circuit comprises a 2 nd current transformer CT2, a 3 rd piezoresistor RV3 and a 3 rd fuse FU3, wherein the primary side of the 2 nd current transformer is connected with the other phase of the three-phase alternating current circuit, the 3 rd fuse and the secondary side of the 2 nd current transformer are connected in series to form two output ends of the second current power taking circuit, the two output ends of the second current power taking circuit are connected with the input end of a second rectifying circuit I, and the 3 rd piezoresistor is connected between the two output ends of the second current power taking circuit in parallel;
the second rectifying circuit I comprises a 3 rd rectifying bridge BRI3, a 4 th electrolytic capacitor C4 and a 3 rd bidirectional transient suppression diode TVS3, two alternating current terminals of the 3 rd rectifying bridge are connected with two output ends of the second current power taking circuit, the positive electrode of the 3 rd rectifying bridge is connected with the positive electrode of the 4 th electrolytic capacitor, one end of the 3 rd bidirectional transient suppression diode is used as the input end of the voltage stabilizing circuit I, and the negative electrode of the 4 th electrolytic capacitor is grounded;
The 5 th diode D5 is connected in series between the first rectifying circuit I and the voltage stabilizing circuit I, and the 6 th diode D6 is connected in series between the second rectifying circuit I and the voltage stabilizing circuit I.
Example III
The phase-failure protector of the three-phase alternating current electric switch machine with controllable compound power supply has the structure basically the same as that of the second embodiment, except that a power supply module I comprises a first current taking circuit, a first rectifying circuit I, a second current taking circuit and a second rectifying circuit I, and further comprises a third current taking circuit, a third rectifying circuit I and a voltage stabilizing circuit I (see figure 7).
The third current power taking circuit comprises a 3 rd current transformer CT3, a 4 th piezoresistor RV4 and a 4 th fuse FU4, wherein the primary side of the 3 rd current transformer is connected with the other phase of the three-phase alternating current circuit, the 4 th fuse and the secondary side of the 3 rd current transformer are connected in series to form two output ends of the third current power taking circuit which are connected with the input end of a third rectifying circuit I in series, and the 4 th piezoresistor is connected between the two output ends of the third current power taking circuit in parallel;
the third rectifying circuit I comprises a 4 th rectifying bridge BR I4, a 5 th electrolytic capacitor C5 and a 4 th bidirectional transient suppression diode TVS4, two alternating current terminals of the 4 th rectifying bridge are connected with two output ends of the third current taking circuit, the positive electrode of the 4 th rectifying bridge is connected with the positive electrode of the 5 th electrolytic capacitor and one end of the 4 th bidirectional transient suppression diode is used as an input end of the voltage stabilizing circuit I, and the negative electrode of the 5 th electrolytic capacitor is grounded;
The 7 th diode D7 is connected in series between the third rectifying circuit I and the voltage stabilizing circuit I.
The three-phase alternating current electric switch machine phase failure protector basic working procedure of the controllable compound power supply of the first embodiment to the third embodiment comprises the following steps:
when the switch machine starts to be driven, a current power-taking circuit of the power supply module I obtains induction current from working current of a three-phase alternating current circuit (current needed by the power supply module I is induced in an isolated mode by adopting a current transformer, alternating current is converted into direct current voltage), voltage for working of the control unit and the driving unit is generated, and meanwhile the voltage is also provided for the power supply control module; when the action of the switch machine is finished, the power supply module I stops supplying power, and the control unit decides whether to keep the 380V power supply connected or not according to actual needs so as to keep the power-on control relay working or recover the power-on control relay, thereby realizing the control of the power supply module II.
The control process comprises the following steps:
when the switch machine starts to act, a 380V three-phase alternating current circuit generates working current, a power taking circuit of a power supply module I obtains induced current from the working current, the induced current is converted into direct current voltage through a rectifying module, the direct current voltage is filtered and stabilized, the power is supplied to a control unit and a driving unit, the power is also supplied to the power supply control module, the control unit sends an on power taking control signal to the power supply control module, a normally open contact of the power taking control relay of the power supply control module is closed, a primary power taking transformer of a power supply module II is connected with the 380V power supply, the power supply module II enters a normal working state, the secondary alternating current voltage of the transformer is converted into direct current voltage through the rectifying module, the direct current voltage is filtered and stabilized and then is used as power supply output, and the power taking circuit and the power supply output of the power supply module I are combined together to continuously supply the control unit, the driving unit and the power supply control module.
When the action of the switch machine is finished, the power supply module I loses power and stops working, the control unit determines whether the power supply of the power supply module II needs to be cut off, so that the power supply control module is selected to send a start power-on power-off control signal or stop power-on power-off control signal, if the power-on power-off control signal is sent, the power-on control relay of the power supply control module loses power and recovers, a normally open contact of the power-on control relay is disconnected, the primary power-off transformer of the power-on module II is disconnected from a 380V power supply, the power supply of the power supply module II fails, no power supply is output, and the whole phase-failure protector loses power and recovers to an initial state; if the control unit continues to send out the start power taking control signal to the power supply control module, the power taking control relay of the power supply control module keeps on working, the primary transformer of the power supply module II is connected with the 380V power supply, and the power supply module II continuously supplies power to the control unit, the driving unit and the power supply control module.
The working principle of the power supply control module is as follows:
the system is powered by the system, then the system voltage is applied to the power taking control relay coil (or the control part) through the 2 nd electrolytic capacitor, the power taking control relay coil (or the control part) is powered by the power taking control relay, the normally open contact is closed, the primary side of the power taking transformer in the power taking module II is communicated with two phases in the three-phase power supply to generate a stepped-down alternating voltage output to be provided for the power supply module II, so that a stable direct current voltage output is generated, the stable direct current voltage output is combined with the power supply output of the power supply module I to be used as a control unit for power supply, and the power supply module II can continuously work; in the self-holding circuit, the 2 nd electrolytic capacitor is used for directly adding the system voltage to the power-taking control relay coil (or the control part) in the initial power-taking stage of the self-holding circuit, the capacitor is not charged yet, the system voltage is directly added to the power-taking control relay coil (or the control part) after the 2 nd electrolytic capacitor is fully charged along with the lengthening of the time, the system voltage is not directly added to the power-taking control relay coil (or the control part), and the 3 rd triode, the 3 rd resistor, the 4 th resistor and the 3 rd voltage stabilizing diode are used for supplying the power-taking control relay coil (or the electromagnetic relay, or the reed switch relay coil, or the control end of the solid state relay or the optical relay) with the voltage lower than the system voltage value after the power-taking control relay acts and the normally open contact is closed, so that the normally open contact of the relay is maintained;
The fourth triode and the resistor are added to the base electrode of the fourth triode, so that the base electrode-emitter electrode of the fourth triode flows through current, the collector electrode-emitter electrode is conducted, the potential of the collector electrode of the fourth triode and the gate electrode of the field effect transistor is close to the ground potential, the source electrode-drain electrode of the field effect transistor is conducted, the system voltage is added to the power supply self-holding circuit, the power supply self-holding circuit works, the voltage power-taking circuit of the power supply module II is connected with a 380V power supply, and the power supply module II works normally; when the control signal is a low-level signal, the power supply is stopped, the low-level signal is added to the base electrode of the 4 th triode through the 6 th resistor, no current flows through the base electrode and the emitter electrode of the 4 th triode, the collector electrode and the gate electrode potential of the 4 th triode are the system voltage values, the source electrode and the drain electrode of the field effect tube are cut off, the power supply self-holding circuit fails because the power supply cannot be obtained, the voltage power-taking circuit of the power supply module II is disconnected with the 380V power supply, and the power supply module II stops working.

Claims (8)

1. A controllable compound-powered three-phase alternating current electric switch machine open-phase protector, which is connected with an electric switch machine action circuit (07) to provide open-phase protection for the same;
the method is characterized in that: the phase failure protector comprises a power supply unit, a control unit (05), a driving unit (06) and a current sampling unit (01), wherein a power taking circuit of the power supply unit is connected with a three-phase alternating current circuit for providing working power for the switch machine, and the output end of the power supply unit is respectively connected with the control unit and the driving unit to provide working power for the switch machine;
The power supply unit comprises a power supply module I (02), a power supply module II (03) and a power supply control module (04), wherein the input end of the power supply module I (02) is connected with a three-phase alternating current circuit through a current power taking circuit, and the output end of the power supply module I is respectively connected with a driving unit, a control unit and the power supply control module; the input end of the power supply module II (03) is connected with the three-phase alternating current circuit through the voltage power taking circuit, and the output end of the power supply module II is respectively connected with the driving unit, the control unit and the power supply control module;
the input end of the current sampling unit (01) is connected with a three-phase alternating current circuit in an isolated mode, the output end of the current sampling unit (01) is connected with the control unit (05), the control unit is respectively connected with the power supply control module (04) and the driving unit (06) through the first control end and the second control end of the control unit, the output end of the driving unit is connected with a protection relay (BHJ) of an action circuit of the electric switch machine, and the communication output end of the control unit is connected with an external detection instrument or a system host;
the drive unit (06) is configured to: receiving an instruction of the control unit, driving and outputting a protection relay (BHJ) of the electric switch machine action circuit to act, and stopping outputting the protection relay (BHJ) of the electric switch machine action circuit to stop acting when the three-phase alternating current circuit is out of phase;
The current sampling unit (01) is used for: performing isolated sampling on the three-phase alternating current circuit, and sending sampling data to a control unit for processing;
the control unit (05) is configured to:
1) Processing the signal from the current sampling unit: the method comprises the steps of phase failure judgment, shunt power supply management, alarm, information display and detection of driving voltage of a driving unit;
2) After the power supply module I is started, a start power-taking control signal or a stop power-taking control signal is provided for the power supply control module, so that the working state of the power supply module II is controlled;
the power supply module I (02) is used for: when the switch machine starts to act, the current-taking circuit takes electricity from the three-phase alternating current circuit and converts working current into alternating current voltage, and the working current is converted into direct current voltage through rectification to provide working power for the control unit, the driving unit and the power supply control module;
the power supply module II (03) is used for: after the power supply control module is started under the control of the power supply control module, the power is taken from the three-phase alternating current circuit through the voltage taking circuit, the 380V power is converted into alternating current low voltage, and the alternating current low voltage is converted into direct current voltage through rectification to provide working power for the control unit, the driving unit and the power supply control module;
The power supply control module (04) is used for: after the power supply module I is started, the primary of a power supply transformer of the power supply module II is connected or disconnected with a 380V power supply according to the start power supply control signal or the stop power supply control signal provided by the control unit, so that the output of the power supply module I and the output of the power supply module II are combined into a redundant composite power supply system, and working power supplies are provided for the control unit, the driving unit and the power supply control module.
2. The controllable composite power supply three-phase ac electric switch machine phase failure protector as claimed in claim 1, wherein:
the control unit (05) comprises a processor (051), a comprehensive power supply circuit (052), a signal conditioning circuit (053), a driving voltage detection circuit (054), a display circuit (055), a communication circuit (056) and an alarm circuit (057);
the processor (051) is connected with the power supply module I and the power supply module II through the integrated power supply circuit (052), is connected with the current sampling unit (01) through the signal conditioning circuit (053), is connected with the driving unit (06) through the driving voltage detection circuit (054), is respectively connected with the power supply control module (04) and the driving unit (06) through the first control end and the second control end of the processor (051), is respectively connected with the display circuit (055), the communication circuit (056) and the alarm circuit (057) through the internal control end of the processor (051), and the output end of the communication circuit (056) is connected with an external detection instrument or a system host;
The processor (051) is used for carrying out digital filtering, logic operation, power supply control, automatic driving voltage adjustment, current voltage display, alarm control and communication control on the current sampling signal;
the integrated power circuit (052) is used for providing working power for each circuit in the control unit;
the signal conditioning circuit (053) is used for filtering, amplifying and performing current-voltage conversion on the current signal from the current sampling unit so as to obtain a measurable voltage signal, and transmitting the measurable voltage signal to an analog-to-digital converter in the processor;
the driving voltage detection circuit (054) is used for detecting the working voltage of the driving unit, feeding back the detection value to the processor, and adjusting the driving unit by the processor according to the feedback value to change the output of the driving voltage;
the display circuit (055) is used for displaying the working current value and the driving voltage value of the three-phase alternating current circuit;
the communication circuit (056) is used for transmitting the current, voltage and working state information of the open-phase protector to an external detecting instrument or system host;
the alarm circuit (057) is used for alarming abnormal conditions of open phase of the three-phase alternating current circuit, unbalanced three-phase current and abnormal driving voltage;
The power supply module I (02) comprises a current power-taking circuit, a rectifying circuit I and a voltage stabilizing circuit I; the current power taking circuit is connected with the three-phase alternating current circuit through a primary coil of the current transformer, the output end of the current power taking circuit is connected with the input end of the rectifying circuit I, the output end of the rectifying circuit I is connected with the input end of the voltage stabilizing circuit I, and the output end of the voltage stabilizing circuit I provides a working power supply for the control unit, the driving unit and the power supply control module;
the power supply module II (03) comprises a voltage power taking circuit, a rectifying circuit II and a voltage stabilizing circuit II; the voltage power taking circuit is connected with the three-phase alternating current circuit through a normally open contact of the power taking transformer and the power taking control relay, the output end of the voltage power taking circuit is connected with the input end of the rectifying circuit II, the output end of the rectifying circuit II is connected with the input end of the voltage stabilizing circuit II, and the output end of the voltage stabilizing circuit II provides a working power supply for the control unit, the driving unit and the power supply control module;
the power supply control module (04) comprises a power taking control relay (KA), wherein the power taking control relay is an electromagnetic relay, a reed switch relay, a solid state relay or an optical relay.
3. The controllable composite power supply three-phase ac electric switch machine phase failure protector as claimed in claim 2, wherein: the power supply module II (03) is a controlled power supply module, and the working mode of the power supply module II is an intermittent working mode or a continuous working mode, and is controlled by a control unit or directly controlled by a circuit or controlled by a timer.
4. A controllable composite powered three-phase ac electric switch machine phase failure protector as claimed in claim 3 wherein:
the power supply control module (04) comprises a power-taking control relay (KA), a 2 nd electrolytic capacitor (C2), a 3 rd voltage stabilizing diode (VD 3), an 8 th diode (D8), a 3 rd resistor (R3), a 4 th resistor (R4), a 5 th resistor (R5), a 6 th resistor (R6), a 3 rd triode (Q3), a 4 th triode (Q4) and a field effect transistor (Q5);
the source electrode of the field effect tube (Q5) is connected with one end of a 5 th resistor (R5) and then is connected with a first power supply output end of a power supply module I and a first power supply output end of a power supply module II, the gate electrode of the field effect tube is connected with the other end of the 5 th resistor and then is connected with the collector electrode of a 4 th triode (Q4), the emitter electrode of the 4 th triode (Q4) is grounded, the base electrode of the 4 th triode is connected with a 6 th resistor (R6), the other end of the 6 th resistor is connected with a first control end of a control unit processor (051), and the power supply control signal is received to be started or stopped;
the drain electrode of the field effect tube (Q5), one end of the 3 rd resistor (R3) and the collector electrode of the 3 rd triode (Q3) are connected with the positive electrode of the 2 nd electrolytic capacitor (C2), and the other end of the 3 rd resistor (R3) is connected with the base electrode of the 3 rd triode (Q3) and the reverse end of the 3 rd zener diode (VD 3);
The emitter of the 3 rd triode (Q3) is connected with one end of a 4 th resistor (R4), the other end of the 4 th resistor is connected with the cathode of the 2 nd electrolytic capacitor (C2), and then is connected with the reverse end of the 8 th diode and one end of the power-taking control relay coil;
the forward end of the 3 rd voltage stabilizing diode (VD 3), the forward end of the 8 th diode (D8), the emitter of the 4 th triode (Q4) and the other end of the power-taking control relay coil are grounded.
5. The controllable composite power supply three-phase ac electric switch machine phase failure protector as claimed in claim 1, 2, 3 or 4, wherein:
the voltage sampling circuit of the power supply module II (03) comprises a power taking transformer (T), a 1 st fuse (FU 1), a 1 st piezoresistor (RV 1) and a normally open contact of a power taking control relay (KA);
the two ends of the 1 st piezoresistor (RV 1) are connected in parallel with the two primary ends of the power taking transformer, one end of the power taking transformer is connected to one phase of the three-phase power supply, the other end of the power taking transformer is connected in series with the 1 st fuse and one end of a normally open contact of the power taking control relay, the other end of the normally open contact of the power taking control relay is connected with the other phase of the three-phase power supply, and the two secondary ends of the power taking transformer are connected with the input end of the rectifying circuit II;
the rectifying circuit II of the power supply module II comprises a 1 st rectifying bridge (BR I1) and a 1 st electrolytic capacitor (C1), two alternating current terminals of the 1 st rectifying bridge are connected with two output ends of the voltage power taking circuit, the positive electrode output end of the 1 st rectifying bridge is connected with the positive electrode of the 1 st electrolytic capacitor and the input end of the voltage stabilizing circuit II, and the negative electrode output end of the 1 st rectifying bridge is grounded;
The voltage stabilizing circuit II of the power supply module II comprises a 1 st resistor (R1), a 1 st bidirectional transient suppression diode (TVS 1), a 1 st voltage stabilizing diode (VD 1), a 1 st diode (D1), a 2 nd diode (D2) and a 1 st triode (Q1);
one end of a 1 st bidirectional transient suppression diode, one end of a 1 st resistor, a collector of a 1 st triode and a positive end of a 1 st rectifier bridge are connected with the positive output end of the 1 st rectifier bridge, the other end of the 1 st resistor and the reverse end of the 1 st voltage stabilizing diode are connected with the base of the 1 st triode, and the other end of the 1 st bidirectional transient suppression diode and the positive end of the 1 st voltage stabilizing diode are grounded;
the emitter of the 1 st triode is connected with the forward end of the 2 nd diode, the reverse end of the 2 nd diode is used as a second power supply output end to supply power to the driving unit, the collector of the 1 st triode is connected with the forward end of the 1 st diode, and the reverse end of the 1 st diode is used as a first power supply output end to supply power to the control unit and the power supply control module.
6. The controllable composite power supply three-phase ac electric switch machine phase failure protector as claimed in claim 5, wherein: the power supply module I (02) comprises a first current acquisition circuit, a first rectifying circuit I and a voltage stabilizing circuit I;
the first current power taking circuit comprises a 1 st current transformer (CT 1), a 2 nd piezoresistor (RV 2) and a 2 nd fuse (FU 2), wherein the primary side of the 1 st current transformer is connected into one phase of a three-phase alternating current circuit, the 2 nd fuse is connected with the secondary side of the 1 st current transformer in series to form two output ends of the first current power taking circuit, the two output ends of the first current power taking circuit are connected with the input end of a first rectifying circuit I, and the 2 nd piezoresistor is connected in parallel between the two output ends of the first current power taking circuit;
The first rectifying circuit I comprises a 2 nd rectifying bridge (BR I2), a 3 rd electrolytic capacitor (C3) and a 2 nd bidirectional transient suppression diode (TVS 2), two alternating current terminals of the 2 nd rectifying bridge are connected with two output ends of the first current power taking circuit, the positive electrode of the 2 nd rectifying bridge is connected with the positive electrode of the 3 rd electrolytic capacitor and one end of the 2 nd bidirectional transient suppression diode is used as an input end of the voltage stabilizing circuit I, and the negative electrode of the 3 rd electrolytic capacitor is grounded;
the voltage stabilizing circuit I comprises a 2 nd resistor (R2), a 2 nd triode (Q2), a 3 rd diode (D3) and a 4 th diode (D4);
one end of a 2 nd bidirectional transient suppression diode, one end of a 2 nd resistor, the collector of a 2 nd triode and the positive end of a 4 th diode are connected with the positive output end of a 2 nd rectifier bridge, the other end of the 2 nd resistor and the reverse end of the 2 nd zener diode are connected with the base of the 2 nd triode, and the other end of the 2 nd bidirectional transient suppression diode and the positive end of the 2 nd zener diode are grounded;
the emitter of the 2 nd triode is connected with the forward end of the 3 rd diode, the reverse end of the 3 rd diode is connected with the second power supply output end of the power supply module II to supply power to the driving unit, the collector of the 2 nd triode is connected with the forward end of the 4 th diode, the reverse end of the 4 th diode is connected with the first power supply output end of the power supply module II to supply power to the control unit and the power supply control module.
7. The controllable composite power supply three-phase ac electric switch machine phase failure protector as claimed in claim 6, wherein: the power supply module I (02) further comprises a second current acquisition circuit and a second rectification circuit I;
the second current power taking circuit comprises a 2 nd current transformer (CT 2), a 3 rd piezoresistor (RV 3) and a 3 rd fuse (FU 3), wherein the primary side of the 2 nd current transformer is connected with the other phase of the three-phase alternating current circuit, the 3 rd fuse is connected with the secondary side of the 2 nd current transformer in series to form two output ends of the second current power taking circuit, the two output ends of the second current power taking circuit are connected with the input end of a second rectifying circuit I, and the 3 rd piezoresistor is connected in parallel between the two output ends of the second current power taking circuit;
the second rectifying circuit I comprises a 3 rd rectifying bridge (BRI 3), a 4 th electrolytic capacitor (C4) and a 3 rd bidirectional transient suppression diode (TVS 3), two alternating current terminals of the 3 rd rectifying bridge are connected with two output ends of the second current power taking circuit, the positive electrode of the 3 rd rectifying bridge is connected with the positive electrode of the 4 th electrolytic capacitor, one end of the 3 rd bidirectional transient suppression diode is used as the input end of the voltage stabilizing circuit I, and the negative electrode of the 4 th electrolytic capacitor is grounded;
the 5 th diode (D5) is connected in series between the first rectifying circuit I and the voltage stabilizing circuit I, and the 6 th diode (D6) is connected in series between the second rectifying circuit I and the voltage stabilizing circuit I.
8. The controllable composite power supply three-phase ac electric switch machine phase failure protector as claimed in claim 7, wherein: the power supply module I (02) further comprises a third current acquisition circuit and a third rectification circuit I;
the third current power taking circuit comprises a 3 rd current transformer (CT 3), a 4 th piezoresistor (RV 4) and a 4 th fuse (FU 4), wherein the primary side of the 3 rd current transformer is connected with the other phase of the three-phase alternating current circuit, the 4 th fuse is connected with the secondary side of the 3 rd current transformer in series to form two output ends of the third current power taking circuit, the two output ends of the third current power taking circuit are connected with the input end of a third rectifying circuit I, and the 4 th piezoresistor is connected in parallel between the two output ends of the third current power taking circuit;
the third rectifying circuit I comprises a 4 th rectifying bridge (BR I4), a 5 th electrolytic capacitor (C5) and a 4 th bidirectional transient suppression diode (TVS 4), two alternating current terminals of the 4 th rectifying bridge are connected with two output ends of the third current taking circuit, the positive electrode of the 4 th rectifying bridge is connected with the positive electrode of the 5 th electrolytic capacitor and one end of the 4 th bidirectional transient suppression diode as input ends of the voltage stabilizing circuit I, and the negative electrode of the 5 th electrolytic capacitor is grounded;
a7 th diode (D7) is connected in series between the third rectifying circuit I and the voltage stabilizing circuit I.
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