CN109217255B - Relay power supply method of phase failure protector of switch machine and relay power supply control module thereof - Google Patents
Relay power supply method of phase failure protector of switch machine and relay power supply control module thereof Download PDFInfo
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- CN109217255B CN109217255B CN201811345523.4A CN201811345523A CN109217255B CN 109217255 B CN109217255 B CN 109217255B CN 201811345523 A CN201811345523 A CN 201811345523A CN 109217255 B CN109217255 B CN 109217255B
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- 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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/06—Arrangements for supplying operative power
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Abstract
The relay power supply method is a method for realizing relay power supply of the phase interruption protector of the three-phase alternating current electric switch machine by combining the relay power supply control module with a protective relay control circuit, and comprises the following steps of: s1, designing a relay power supply control module; s2, connecting the relay power supply control module with a protective relay control circuit; s3, starting the switch machine to act, enabling the power supply module I to work, enabling the power supply self-holding module to obtain power, enabling the power supply module II to work, and forming relay redundant power supply with the power supply module I; s4, the power supply self-holding module fails or the power supply module II fails, and the power supply module I supplies power normally; s5, stopping the action of the switch machine or powering the fault of the power supply module I by relay power supply of the power supply module II: the power supply module I and the power supply module II of the relay power supply control module used in the method can realize relay power supply, thereby improving the reliability of the phase interruption protector and ensuring the normal work of the alternating current electric switch machine.
Description
Technical Field
The invention relates to a circuit method and a control module of a phase failure protector of a railway point machine, in particular to a relay power supply method and a relay power supply control module for the phase failure protector of an alternating current electric point machine.
Background
The railway line changes the running path of the train through the turnout, the apparatus to change the turnout position is called the point switch, according to the difference of the action power, divide into direct-flow electric point switch and alternating-flow electric point switch, the alternating-flow electric point switch uses the three-phase alternating-current motor, when the three-phase alternating-current power fails, the current of another two phases increases rapidly, cause the three-phase motor winding to be burnt out because of the too high temperature rise, therefore in the action circuit of the alternating-current electric point switch, there is a open-phase protective relay, when the open-phase happens, the protective relay control circuit cuts off the action power of the point switch in time through the control to the protective relay, in order to protect the three-phase motor from damaging.
At present, three main types of phase failure protectors used on railways are used for protecting power supply modes of a relay control circuit:
1. three current transformers are used for taking electricity from three-phase alternating current working currents, 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 the protective relay to be sucked up after rectification and filtering;
2. one or more current transformers are used for taking electricity from three-phase alternating current working current, the electricity is supplied to the control unit after rectification, and whether the driving output of the electricity is controlled by the control unit or not;
3. one or more power transformers are used for providing working power for the driving circuit, required low voltage is obtained from three-phase alternating current 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 power supply modes, modes 1 and 2 are also called current power taking modes, and mode 3 is also called voltage power taking modes, and have the following problems:
1. the power supply mode is single, and the reliability is low; whether the current is taken (the current is taken by using a current transformer) or the voltage is taken (the voltage of any two phases of the 380V three-phase alternating current power supply is taken by using a transformer), the power supply mode is only one, the single power supply mode has poor anti-interference capability, so that the reliability is poor, when a power supply module fails, the whole system is invalid, and a phase failure protector cannot work;
2. for the power supply mode of current electricity taking, the following defects also exist:
(1) When a large current occurs due to overload of a load, short circuit of a power supply and the like, the large current will cause overload of the primary side of the current transformer;
(2) When the switch machine stops working, the whole system is powered off;
3. for the power supply mode of voltage electricity taking, the following defects also exist:
(1) When a large voltage occurs due to voltage rise or lightning, 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 three-phase alternating current working power supply for a long time, when the power supply module is damaged by the 380V three-phase alternating current power supply due to external factors such as thunder and lightning, the whole system can be disabled, and the phase failure protector cannot work.
Disclosure of Invention
The invention aims to provide a relay power supply control module for relay power supply of a phase failure protector of a switch machine, which overcomes the defects of 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 relay power supply method for the open-phase protector of switch machine features that the relay power supply control module and the protection relay control circuit are combined to realize relay power supply for open-phase protector of three-phase AC electric switch machine,
the method specifically comprises the following steps:
s1, designing a relay power supply control module;
the relay power supply control module comprises a power supply self-holding module, a power supply module I and a power supply module II;
the power supply module I adopts a current power taking mode and comprises a current power taking circuit with a current transformer;
the power supply module II adopts a voltage power taking mode and comprises a voltage power taking circuit with an alternating-current step-down transformer;
the power supply self-holding module comprises a self-holding control circuit and a power taking relay, the self-holding control circuit controls the input of a voltage power taking circuit by controlling a normally open contact switch of the power taking relay,
the power supply self-holding module is powered by a power supply module I and a power supply module II;
s2, connecting the relay power supply control module with a protective relay control circuit;
s21, connecting the input end of the power supply module I with a 380V three-phase alternating current working circuit of the switch machine, wherein the specific connection method comprises the following steps:
s211, connecting the input end of the power supply module I, namely a current transformer of the current power taking circuit, with a 380V three-phase alternating current working circuit of the switch machine in an isolated mode, and connecting the primary side of the current transformer in series into any one phase of the three-phase alternating current.
S212, the output end of the power supply module I is connected with the protection relay control circuit and the power supply end of the power supply self-holding module;
s22, connecting the input end of the power supply module II with a 380V three-phase alternating current working circuit of the switch machine, wherein the specific connection method comprises the following steps:
s221, connecting an input end of a power supply module II, namely one end of an alternating current step-down transformer primary of a voltage power take-off circuit, with one phase of a 380V three-phase alternating current working circuit of the switch machine through a normally open contact switch of the power take-off relay, and connecting the other end of the alternating current step-down transformer primary with any one phase of the other two phases of the 380V three-phase alternating current working circuit of the switch machine;
s222, the output end of the power supply module II is connected with the protection relay control circuit and the power supply end of the power supply self-holding module;
s23, connecting the output end of a self-holding control circuit of the power supply self-holding module with a coil of the power-taking relay KA, and controlling a normally-open contact switch of the power-taking relay through the self-holding control circuit;
s3, starting the switch machine to act, and enabling a power supply module I to work to supply power for the power supply self-holding module and the protection relay control circuit;
s31, a current transformer of a current power-taking circuit of the power supply module I acquires induction current from a 380V three-phase alternating current working circuit of the switch machine, and direct current voltage generated after rectification, filtering and voltage stabilization is power supply output I to supply power to a power supply self-holding module and a protection relay control circuit;
s32, the power supply module II is powered on to work, and relay redundant power supply of the phase failure protector is formed by the power supply module I;
because the power supply module I works, the power supply self-holding module is powered, the self-holding control circuit controls the normally open contact switch of the power-taking relay KA to be closed, so that the primary side of the alternating-current step-down transformer of the voltage power-taking circuit of the power supply module II is connected with the 380V three-phase alternating-current working circuit of the switch machine, the power supply module II works, the direct-current voltage generated after the voltage output by the alternating-current step-down transformer is rectified, filtered and stabilized, namely, the power supply output II is connected with the power supply output I, and the power supply self-holding module and the protection relay control circuit are powered together, so that relay redundant power supply of the phase-failure protector is formed;
s4, when the power supply self-holding module fails or the power supply module II fails, the power supply module I supplies power normally;
the power supply self-holding module is in fault, so that the power supply module II cannot supply power, or when the power supply module II fails to supply power, the power supply module I normally supplies power to the power supply self-holding module and the protection relay control circuit;
s5, stopping the action of the switch machine or powering the fault of the power supply module I by relay power supply of the power supply module II:
when the action of the switch machine is finished, a 380V three-phase alternating current working circuit of the switch machine has no current, the power supply module I loses power to stop working, or the power supply module I fails to stop working, the power supply self-holding module continuously obtains the power supply support of the power supply module II, so that the normally open contact switch of the power taking relay continuously keeps the suction state, the primary side of the alternating current step-down transformer of the power supply module II continuously keeps being connected with the 380V three-phase alternating current working circuit of the switch machine, and the power supply module II normally works to supply power to the power supply self-holding module and the protection relay control circuit.
The other technical scheme is as follows:
the relay power supply control module is used for realizing the relay power supply method of the phase failure protector of the electric switch machine and comprises a power supply self-retaining module, a power supply module I and a power supply module II;
the power supply self-holding module comprises a self-holding control circuit and a power-taking relay with one or more groups of normally open contact switches, the output end of the self-holding control circuit is connected with a coil of the power-taking relay, and the power supply input end of the self-holding control circuit is connected with the direct current power supply output ends of the power supply module I and the power supply module II;
the power supply module I comprises a current power taking circuit and a direct current stabilized voltage supply I, wherein the current power taking circuit is connected with one of 380V three-phase alternating current working circuits of the switch machine in an isolated mode by adopting a current transformer, the output end of the current power taking circuit is connected with the input end of the direct current stabilized voltage supply I, and the direct current power supply generated by the direct current stabilized voltage supply I is a power supply output I for supplying power to the power supply self-protection module and the protection relay control circuit;
the power supply module II comprises a voltage power taking circuit and a direct-current stabilized power supply II, wherein the voltage power taking circuit is connected with two phases of a 380V three-phase alternating-current working circuit of the switch machine through an alternating-current step-down transformer and a normally open contact switch of a power taking relay, the output end of the voltage power taking circuit is connected with the input end of the direct-current stabilized power supply II, and the direct-current power supply generated by the direct-current stabilized power supply II, namely a power supply output II, is connected with the power supply output I and supplies power for the power supply self-holding module and the protection relay control circuit together, so that relay redundant power supply of a phase-failure protector is formed by the voltage power taking circuit and the power supply module I;
the self-holding control circuit comprises a 1 st resistor, a 2 nd resistor, a triode, a freewheel diode, a voltage stabilizing diode and an electrolytic capacitor;
the emitter of the triode is connected with one end of a 2 nd resistor, the other end of the 2 nd resistor is an output positive end, the collector of the triode is connected with a power supply input positive end, the base of the triode is connected with the common connection end of a 1 st resistor and a voltage-stabilizing diode, the other end of the 1 st resistor is connected with the power supply input positive end, and the other end of the voltage-stabilizing diode is an output negative end;
the electrolytic capacitor is connected in parallel between the positive end of the output end and the positive end of the power supply input, the flywheel diode is connected in parallel between the positive end of the output end and the negative end of the output end, and the negative end of the output end is connected with the negative end of the power supply input;
the power supply of the self-holding control circuit comes from the combination of the power supply output of the power supply module I and the power supply output of the power supply module II, and the positive end of the output end and the negative end of the output end are connected with the coil of the power taking relay.
Further:
the direct-current stabilized power supply I comprises a rectifying and filtering circuit I and a voltage stabilizing circuit I, and the direct-current stabilized power supply II comprises a rectifying and filtering circuit II and a voltage stabilizing circuit II.
By adopting the technical scheme, the relay power supply method of the phase failure protector of the switch machine and the relay power supply control module thereof have the following beneficial effects:
1. the relay power supply control module adopted by the method is provided with a power supply self-retaining module, and the self-retaining control circuit can realize the self-retaining function of the power-taking relay, so that the reliability of the phase-failure protector is improved, and the normal work of the alternating current electric switch machine is ensured: in the action process of the switch machine, if the power supply module I fails, the power supply module II continuously works through the power supply self-holding module, so that the whole functions of the phase failure protector are not influenced; if the power supply module II or the power supply self-holding module fails, the power supply module II fails, and although the advanced function of the phase failure protector cannot be used, the power supply module I works normally, the basic phase failure protection function can still be guaranteed to be realized, and the reliability of power supply is not influenced by the control unit;
2. the system can realize more complex advanced functions such as real-time electric quantity display, data recording, action current and driving voltage analysis, historical data inquiry, data transmission and the like;
3. the two output ends of the self-holding control circuit are connected with the flywheel diode D in parallel, and the flywheel diode D is actually connected with the two ends of the coil of the power-taking relay in parallel, so that high-voltage damage elements of the coil of the power-taking relay due to sudden power failure can be prevented.
The technical features of the relay power supply method and the relay power supply control module of the phase failure protector of the switch machine of the invention are further described below with reference to the accompanying drawings and the embodiments.
Drawings
Fig. 1-2 are block diagrams of a control circuit of a prior protection relay:
FIG. 1 is a current draw mode, and FIG. 2 is a voltage draw mode;
FIG. 3 is a block diagram of a protective relay control circuit in combination with a relay power control module;
FIG. 4 is a schematic circuit diagram of a relay power control module according to the present invention;
the power supply module I comprises a current power taking circuit and a direct-current stabilized voltage supply I, the power supply module II comprises a normally open contact switch of a power taking relay KA, a voltage power taking circuit and a direct-current stabilized voltage supply II, and the power supply self-holding module comprises a power taking relay KA coil and a self-holding control circuit;
FIG. 5 is a circuit diagram of a self-sustaining control circuit of the relay power control module of the present invention;
FIG. 6 is a flowchart of the relay power supply of the phase failure protector of the switch machine according to the present invention;
in the figure:
00-a protective relay control circuit, 01-a current sampling unit, 02-a power supply module I, 021-a current sampling circuit, 022-a direct current stabilized voltage supply I, 03-a power supply module II, 031-a voltage sampling circuit, 032-a direct current stabilized voltage supply II, 04-a power supply self-holding module, 041-a self-holding control circuit;
BHJ-protection relay, KA-electricity-taking relay, R1-1 st resistance, R2-2 nd resistance, C-electrolytic capacitor, VD-voltage stabilizing diode, D-freewheel diode, Q-triode.
Detailed Description
Example 1
A relay power supply method for the open-phase protector of switch machine features that the relay power supply control module and the protection relay control circuit are combined to realize relay power supply for open-phase protector of three-phase AC electric switch machine,
the method specifically comprises the following steps:
s1, setting (or designing) a relay power supply control module;
the relay power supply control module comprises a power supply self-holding module 04, a power supply module I02 and a power supply module II 03,
the power supply module I02 adopts a current power taking mode and comprises a current power taking circuit with a current transformer;
the power supply module II 03 adopts a voltage power taking mode and comprises a voltage power taking circuit with an alternating-current step-down transformer;
the power supply self-holding module 04 comprises a self-holding control circuit 041 and a power-taking relay KA, the self-holding control circuit 041 controls the input of a voltage power-taking circuit by controlling a normally open contact switch of the power-taking relay KA,
the power supply self-holding module 04 is powered by a power supply module I02 and a power supply module II 03;
s2, connecting the relay power supply control module with a protective relay control circuit;
s21, connecting the input end of the power supply module I02 with a 380V three-phase alternating current working circuit of the switch machine, wherein the specific connection method comprises the following steps:
s211, connecting the input end of the power supply module I02, namely a current transformer of the current extraction circuit 021, with a 380V three-phase alternating current working circuit of the switch machine in an isolated mode, and connecting the primary side of the current transformer in series into any one phase of the three-phase alternating current.
S212, the output end of the power supply module I02 is connected with a protection relay control circuit and the power supply end of the power supply self-holding module 04;
s22, connecting the input end of the power supply module II 03 with a 380V three-phase alternating current working circuit of the switch machine, wherein the specific connection method comprises the following steps:
s221, connecting an input end of a power supply module II 03, namely one end of an alternating current step-down transformer primary of a voltage power take-off circuit, with one phase of a 380V three-phase alternating current working circuit of the switch machine through a normally open contact switch of a power take-off relay KA, and connecting the other end of the alternating current step-down transformer primary with any one phase of the other two phases of the 380V three-phase alternating current working circuit of the switch machine;
s222, the output end of the power supply module II is connected with a protection relay control circuit and the power supply end of the power supply self-holding module 04;
s23, connecting the output end of a self-holding control circuit 041 of the power supply self-holding module 04 with a coil of the power-taking relay KA, and controlling a normally-open contact switch of the power-taking relay KA through the self-holding control circuit;
s3, starting the switch machine to act, and enabling a power supply module I to work to supply power for the power supply self-holding module and the protection relay control circuit;
s31, a current transformer of a current taking circuit 021 of a power supply module I acquires induction current from a 380V three-phase alternating current working circuit of a switch machine, and direct current voltage generated after rectification, filtering and voltage stabilization is power supply output I to supply power to a power supply self-holding module and a protective relay control circuit;
s32, the power supply module II is powered on to work, and relay redundant power supply of the phase failure protector is formed by the power supply module I;
because the power supply module I works, the power supply self-holding module is powered, the self-holding control circuit controls the normally open contact switch of the power-taking relay KA to be closed, so that the primary side of the alternating-current step-down transformer of the voltage power-taking circuit of the power supply module II is connected with the 380V three-phase alternating-current working circuit of the switch machine, the power supply module II works, the direct-current voltage generated after the voltage output by the alternating-current step-down transformer is rectified, filtered and stabilized, namely, the power supply output II is connected with the power supply output I, and the power supply self-holding module and the protection relay control circuit are powered together, so that relay redundant power supply of the phase-failure protector is formed;
s4, when the power supply self-holding module fails or the power supply module II fails, the power supply module I supplies power normally;
the power supply self-holding module is in fault, so that the power supply module II cannot supply power, or when the power supply module II fails to supply power, the power supply module I normally supplies power to the power supply self-holding module and the protection relay control circuit;
s5, stopping the action of the switch machine or powering the fault of the power supply module I by relay power supply of the power supply module II:
when the action of the switch machine is finished, a 380V three-phase alternating current working circuit of the switch machine has no current, the power supply module I loses power to stop working, or the power supply module I fails to stop working, the power supply self-holding module continuously obtains the power supply support of the power supply module II, so that the normally open contact switch of the power taking relay KA continuously keeps the suction state, the primary side of the alternating current step-down transformer of the power supply module II continuously keeps being connected with the 380V three-phase alternating current working circuit of the switch machine, and the power supply module II normally works to supply power to the power supply self-holding module and the protection relay control circuit.
Example two
The relay power supply control module is used for realizing the relay power supply method of the phase failure protector of the electric switch machine in the first embodiment, and comprises a power supply self-holding module 04, a power supply module I02 and a power supply module II 03;
the power supply self-holding module 04 comprises a self-holding control circuit 041 and a power-taking relay KA with one or more groups of normally-open contact switches, wherein the output end of the self-holding control circuit is connected with a coil of the power-taking relay KA, and the power supply input end of the self-holding control circuit is connected with the direct current power supply output ends of the power supply module I02 and the power supply module II 03;
the power supply module I02 comprises a current power taking circuit 021 and a direct current stabilized voltage supply I022, wherein the current power taking circuit is connected with one of 380V three-phase alternating current working circuits of the switch machine in an isolated mode by adopting a current transformer, the output end of the current power taking circuit is connected with the input end of the direct current stabilized voltage supply I, and the direct current power supply generated by the direct current stabilized voltage supply I is power supply output I and supplies power for the power supply self-holding module and the protection relay control circuit; the power supply module II 03 comprises a voltage power taking circuit 031 and a direct-current stabilized power supply II 032, wherein the voltage power taking circuit is connected with two phases of a 380V three-phase alternating-current working circuit of the switch machine through an alternating-current step-down transformer and a normally open contact switch of a power taking relay KA, the output end of the voltage power taking circuit is connected with the input end of the direct-current stabilized power supply II, and a direct-current power supply generated by the direct-current stabilized power supply II, namely a power supply output II, is connected with a power supply output I and supplies power for the power supply self-holding module and the protection relay control circuit together, so that relay redundant power supply of a phase-failure protector is formed by the voltage power taking circuit and the power supply module I;
the self-holding control circuit 041 comprises a 1 st resistor R1, a 2 nd resistor R2, a triode Q, a freewheeling diode D, a zener diode VD and an electrolytic capacitor C;
the emitter of the triode is connected with one end of a 2 nd resistor R2, the other end of the 2 nd resistor is an output end positive end, the collector of the triode is connected with a power supply input positive end, the base of the triode is connected with the common connection end of the 1 st resistor and a voltage-stabilizing diode VD, the other end of the 1 st resistor is connected with the power supply input positive end, and the other end of the voltage-stabilizing diode VD is an output end negative end;
the electrolytic capacitor C is connected in parallel between the positive end of the output end and the positive end of the power supply input, the flywheel diode D is connected in parallel between the positive end of the output end and the negative end of the output end, and the negative end of the output end is connected with the negative end of the power supply input;
the power supply of the self-holding control circuit comes from the combination of the power supply output of the power supply module I02 and the power supply module II 03, and the positive end of the output end and the negative end of the output end are connected with the coil of the power taking relay KA.
The direct current stabilized power supply I022 comprises a rectifying and filtering circuit I and a voltage stabilizing circuit I, and the direct current stabilized power supply II 032 comprises a rectifying and filtering circuit II and a voltage stabilizing circuit II.
The foregoing is a basic embodiment of the invention, and in principle any form of modification that does not require inventive effort would fall within the scope of the invention as claimed.
Working principle of power supply self-holding module
After the switch mechanism control system supplies power to the switch motor, the power supply module I of the phase failure protector generates two paths of direct current power supply outputs, wherein one path of direct current power supply outputs power the power supply self-retaining module of the control unit.
After the power supply self-holding module is electrified, the power taking relay self-holding control circuit works to provide exciting current for the power taking relay coil, the power taking relay coil is electrified to drive the normally open contact to be closed, so that the primary of the transformer of the power supply module II is communicated with two phases in the three-phase power supply to generate two paths of stable direct current power supply output, and the two paths of stable direct current power supply output are combined with the power supply output of the power supply module I to serve as power supply of the control unit, the driving unit and the power supply self-protecting module.
Because the voltage of the control system of the switch machine of 380V is a stable power supply source, the power supply module II can continuously provide direct current power supply output, so that the power supply module II can always supply power for the self-holding control circuit of the power taking relay, the power taking relay is ensured to be attracted, and the power supply module II can continuously work, so that even if the action of the switch machine is finished, the power supply module I loses power, and after the work is stopped, the whole phase-failure protector keeps normal power supply.
Workflow (see fig. 6).
Claims (3)
1. A relay power supply method for a phase failure protector of a switch machine is characterized in that: the relay power supply method adopts the combination of a relay power supply control module and a protective relay control circuit to realize relay power supply of a phase failure protector of the three-phase alternating current electric switch machine,
the method specifically comprises the following steps:
s1, designing a relay power supply control module;
the relay power supply control module comprises a power supply self-holding module (04), a power supply module I (02) and a power supply module II (03),
the power supply module I (02) adopts a current power taking mode and comprises a current power taking circuit with a current transformer;
the power supply module II (03) adopts a voltage power taking mode and comprises a voltage power taking circuit with an alternating-current step-down transformer;
the power supply self-holding module (04) comprises a self-holding control circuit (041) and a power taking relay (KA), wherein the self-holding control circuit (041) controls the input of the voltage power taking circuit through controlling a normally open contact switch of the power taking relay (KA);
the power supply self-holding module (04) is powered by a power supply module I (02) and a power supply module II (03);
s2, connecting the relay power supply control module with a protective relay control circuit;
s21, connecting the input end of the power supply module I (02) with a 380V three-phase alternating current working circuit of the switch machine, wherein the specific connection method comprises the following steps:
s211, connecting a current transformer of a current power-taking circuit (021) which is the input end of a power supply module I (02) with a 380V three-phase alternating current working circuit of the switch machine in an isolated mode, wherein the primary side of the current transformer is connected in series into any phase of three-phase alternating current;
s212, the output end of the power supply module I (02) is connected with a protection relay control circuit and the power supply end of the power supply self-holding module (04);
s22, connecting the input end of a power supply module II (03) with a 380V three-phase alternating current working circuit of the switch machine, wherein the specific connection method comprises the following steps:
s221, connecting an input end of a power supply module II (03), namely one end of an alternating current step-down transformer primary of a voltage power take-off circuit, with one phase of a 380V three-phase alternating current working circuit of a switch machine through a normally open contact switch of a power take-off relay (KA), and connecting the other end of the alternating current step-down transformer primary with any one phase of the other two phases of the 380V three-phase alternating current working circuit of the switch machine;
s222, the output end of the power supply module II is connected with a protection relay control circuit and the power supply end of the power supply self-holding module (04);
s23, connecting the output end of a self-holding control circuit (041) of a power supply self-holding module (04) with a coil of a power taking relay (KA), and controlling a normally open contact switch of the power taking relay (KA) through the self-holding control circuit;
s3, starting the switch machine to act, and enabling a power supply module I to work to supply power for the power supply self-holding module and the protection relay control circuit;
s31, a current transformer of a current extraction circuit (021) of the power supply module I acquires induction current from a 380V three-phase alternating current working circuit of the switch machine, and direct current voltage generated after rectification, filtering and voltage stabilization is power supply output I to supply power to a power supply self-holding module and a protection relay control circuit;
s32, the power supply module II is powered on to work, and relay redundant power supply of the phase failure protector is formed by the power supply module I;
because the power supply module I works, the power supply self-holding module is powered, the self-holding control circuit controls the normally open contact switch of the power-taking relay (KA) to be closed, so that the primary side of the alternating-current step-down transformer of the voltage power-taking circuit of the power supply module II is connected with the 380V three-phase alternating-current working circuit of the switch machine, the power supply module II works, the direct-current voltage generated after the voltage output by the alternating-current step-down transformer is rectified, filtered and stabilized, namely, the power supply output II is connected with the power supply output I, and the power supply self-holding module and the protection relay control circuit are jointly powered, so that relay redundant power supply of the phase-failure protector is formed;
s4, when the power supply self-holding module fails or the power supply module II fails, the power supply module I supplies power normally;
the power supply self-holding module is in fault, so that the power supply module II cannot supply power, or when the power supply module II fails to supply power, the power supply module I normally supplies power to the power supply self-holding module and the protection relay control circuit;
s5, stopping the action of the switch machine or powering the fault of the power supply module I by relay power supply of the power supply module II:
when the action of the switch machine is finished, a 380V three-phase alternating current working circuit of the switch machine has no current, the power supply module I loses power to stop working, or the power supply module I fails to stop working, the power supply self-holding module continuously obtains the power supply support of the power supply module II, so that the normally open contact switch of the power taking relay (KA) continuously keeps in a suction state, the primary stage of the alternating current step-down transformer of the power supply module II continuously keeps being connected with the 380V three-phase alternating current working circuit of the switch machine, and the power supply module II normally works to supply power to the power supply self-holding module and the protection relay control circuit.
2. The utility model provides a relay power supply control module which characterized in that: the relay power supply control module is used for realizing the relay power supply method of the phase failure protector of the electric switch machine according to claim 1 and comprises a power supply self-holding module (04), a power supply module I (02) and a power supply module II (03);
the power supply self-holding module (04) comprises a self-holding control circuit (041) and a power taking relay (KA) with one or more groups of normally open contact switches, the output end of the self-holding control circuit is connected with the coil of the power taking relay (KA), and the power supply input end of the self-holding control circuit is connected with the direct current power supply output ends of the power supply module I (02) and the power supply module II (03);
the power supply module I (02) comprises a current power taking circuit (021) and a direct current stabilized voltage supply I (022), wherein the current power taking circuit is connected with one of 380V three-phase alternating current working circuits of the switch machine in an isolated mode by adopting a current transformer, the output end of the current power taking circuit is connected with the input end of the direct current stabilized voltage supply I, and the direct current power supply generated by the direct current stabilized voltage supply I is power supply output I and is used for supplying power to the power supply self-holding module and the protective relay control circuit;
the power supply module II (03) comprises a voltage power taking circuit (031) and a direct-current stabilized power supply II (032), the voltage power taking circuit is connected with 380V three-phase alternating current working circuit of the switch machine through a normally open contact switch of an alternating current step-down transformer and a power taking relay (KA), the output end of the voltage power taking circuit is connected with the input end of the direct-current stabilized power supply II, and a direct-current power supply generated by the direct-current stabilized power supply II, namely, a power supply output II, is connected with a power supply output I to supply power for the power supply self-holding module and the protection relay control circuit together, so that relay redundant power supply of the phase-failure protector is formed by the voltage power taking circuit and the power supply module I;
the self-holding control circuit (041) comprises a 1 st resistor (R1), a 2 nd resistor (R2), a triode (Q), a freewheel diode (D), a zener diode (VD) and an electrolytic capacitor (C);
the emitter of the triode (Q) is connected with one end of a 2 nd resistor (R2), the other end of the 2 nd resistor (R2) is the positive end of the output end, the collector of the triode (Q) is connected with the positive end of the power supply input, the base of the triode (Q) is connected with the common connection end of a 1 st resistor (R1) and a voltage stabilizing diode (VD), the other end of the 1 st resistor (R1) is connected with the positive end of the power supply input, and the other end of the voltage stabilizing diode (VD) is the negative end of the output end;
the electrolytic capacitor (C) is connected in parallel between the positive end of the output end and the positive end of the power supply input, the flywheel diode (D) is connected in parallel between the positive end of the output end and the negative end of the output end, and the negative end of the output end is connected with the negative end of the power supply input;
the power supply of the self-holding control circuit comes from the combination of the power supply output of the power supply module I (02) and the power supply module II (03), and the positive end and the negative end of the output end of the self-holding control circuit are connected with the coil of the power taking relay (KA).
3. A relay power control module as set forth in claim 2 wherein:
the direct current stabilized power supply I (022) comprises a rectifying and filtering circuit I and a voltage stabilizing circuit I, and the direct current stabilized power supply II (032) comprises a rectifying and filtering circuit II and a voltage stabilizing circuit II.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811345523.4A CN109217255B (en) | 2018-11-13 | 2018-11-13 | Relay power supply method of phase failure protector of switch machine and relay power supply control module thereof |
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| CN201811345523.4A CN109217255B (en) | 2018-11-13 | 2018-11-13 | Relay power supply method of phase failure protector of switch machine and relay power supply control module thereof |
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| CN114079259A (en) * | 2020-08-12 | 2022-02-22 | 天津首瑞智能电气有限公司 | Protective device |
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| CN2310411Y (en) * | 1997-11-14 | 1999-03-10 | 佟兰 | Microsecond-level overvoltage protection device |
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| CN109217255A (en) | 2019-01-15 |
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