CN212462756U - Circuit structure for completing automatic switching of double-power-supply double-bus with bus coupler in electromagnetic mode - Google Patents
Circuit structure for completing automatic switching of double-power-supply double-bus with bus coupler in electromagnetic mode Download PDFInfo
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- CN212462756U CN212462756U CN202021139448.9U CN202021139448U CN212462756U CN 212462756 U CN212462756 U CN 212462756U CN 202021139448 U CN202021139448 U CN 202021139448U CN 212462756 U CN212462756 U CN 212462756U
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Abstract
The utility model provides an electromagnetic circuit structure for completing the automatic switching of a double-power-supply double-bus with bus connection, which comprises a current sampling loop, a voltage sampling loop and a logic control loop; the current sampling loop is provided with two groups of current transformers and two groups of current relays and is used for collecting three-phase current of the bus; the voltage sampling loop is provided with two groups of voltage transformers and four groups of voltage relays and is used for collecting three-phase voltage of the bus; and the logic control loop is used for judging the fault and performing switching-on and switching-off operation. The utility model discloses, can be at the circuit structure automatic switch-over in-process of dual supply double bus-bar strip female antithetical couplet, the accurate judgement loses the electric signal and is that the power loss of primary circuit leads to, still secondary circuit loses the power and leads to, and correct control dual supply switching process causes unnecessary undulant of voltage when avoiding automatic switch-over. The uninterrupted power supply of the double power sources is realized, and a safer and more reliable power supply guarantee is provided for key loads.
Description
Technical Field
The utility model relates to an electrical engineering automation switches technical field, especially relates to an electromagnetic type accomplishes dual supply double bus and takes female circuit structure who allies oneself with automatic switch-over.
Background
When the transformer substation adopts a power supply mode of double bus section operation, two bus sections operate in sections, and when one bus section loses power, the other bus section supplies power to the power-losing bus section in time through the bus coupler switch. However, the voltage signals of the existing protection device are all taken from the secondary circuit, and the power-off signals can not be accurately judged whether the power-off signals are caused by the power-off of the primary circuit or caused by the fault and the power-off of the secondary circuit. When the power-off signal is caused by the power-off of the secondary loop, the bus coupler should not be switched, but the bus coupler is switched to act due to the fact that the reflected phenomenon and the fault signal are the same as the power-off of the primary loop, and unnecessary fluctuation of voltage is caused. When the current reference value is used for distinguishing the primary loop power loss or the secondary loop power loss, the voltage disappears quickly, the current disappears slowly, and the current of the normal section cannot be supplied to the power loss section in time, so that unnecessary loss is caused.
In view of this, a circuit structure for completing the automatic switching of the dual-power-supply dual-bus with the bus coupler in an electromagnetic manner is provided, which is used for distinguishing the power loss of a primary loop or the power loss of a secondary loop, avoiding the protection misoperation and ensuring the safe and stable operation of a power supply system.
Disclosure of Invention
An object of the utility model is to provide an electromagnetic type accomplishes dual supply double bus-bar strip female circuit structure who allies oneself with automatic switch-over for distinguish that primary circuit loses electricity or secondary circuit loses electricity, stop the protection malfunction, ensure the operation of power supply system safety and stability.
The utility model discloses a technique be:
a circuit structure for completing automatic switching of a dual-power double-bus with bus connection in an electromagnetic mode comprises a current sampling loop, a voltage sampling loop and a logic control loop, wherein the current sampling loop is provided with two groups of current transformers and two groups of current relays, the two groups of current transformers are respectively arranged on a section of bus and a section of bus, and the first group of current relays are connected to the secondary side of the section of bus current transformer and used for collecting three-phase current of the section of bus; the second group of current relays are connected to the secondary side of the two-section bus current transformer and used for collecting three-phase current of the two-section bus;
the voltage sampling loop is provided with two groups of voltage transformers and four groups of voltage relays; the first group of voltage transformers comprises a voltage transformer PT1 and a voltage transformer PT3 which are connected to the first section of bus, and the second group of voltage transformers comprises a voltage transformer PT2 and a voltage transformer PT4 which are connected to the second section of bus; the first group of voltage relays are connected to the secondary side of the voltage transformer PT1, and the second group of voltage relays are connected to the secondary side of the voltage transformer PT3 and are used for collecting three-phase voltage of a section of bus; the third group of voltage relays are connected to the secondary side of the voltage transformer PT2, and the fourth group of voltage relays are connected to the secondary side of the voltage transformer PT4 and are used for collecting three-phase voltage of a two-section bus;
and the logic control loop is used for judging the fault and performing switching-on and switching-off operations, and comprises the following components in parallel connection:
the locking device is used for disconnecting the direct-current power supply when the first section of bus circuit or the second section of bus circuit has symmetrical overcurrent or asymmetrical overcurrent;
the high-current locking loop is used for receiving a symmetrical overcurrent or asymmetrical overcurrent signal generated in the first section of bus loop or the second section of bus loop and sending an instruction to the locking device;
the first section of the incoming line switch opening loop is used for opening operation when three-phase symmetrical voltage loss or asymmetrical voltage loss occurs in the first section of the bus loop;
the two-section incoming line switch opening loop is used for opening operation when three-phase symmetrical voltage loss or asymmetrical voltage loss occurs in the two-section bus loop;
and the bus coupler switch closing circuit is used for the bus coupler switch closing operation when three-phase symmetrical voltage loss or asymmetrical voltage loss occurs in the first section of bus circuit or the second section of bus circuit.
As a further optimization of the scheme, the current transformers comprise a current transformer TAa, a current transformer TAb and a current transformer TAc which are respectively connected to three phases, and the first group of current relays comprise a current relay A1, a current relay B1 and a current relay C1 which are respectively connected to the secondary sides of the first section of bus current transformer TAa, the current transformer TAb and the current transformer TAc; the second group of current relays comprise a2, a B2 and a C2, and are respectively connected to the secondary sides of a two-section bus current transformer TAa, a current transformer TAb and a current transformer TAC;
the first group of voltage relays comprises a voltage relay A3, a voltage relay B3 and a voltage relay C3; the second group of voltage relays comprises a voltage relay A4, a voltage relay B4 and a voltage relay C4; the third group of voltage relays comprises a voltage relay A5, a voltage relay B5 and a voltage relay C5; the fourth group of voltage relays comprises a voltage relay A6, a voltage relay B6 and a voltage relay C6.
As a further optimization of the scheme, the large-current latching circuit comprises an intermediate relay J0, and an auxiliary contact a1 of a current relay a1, an auxiliary contact B1 of a current relay B1, an auxiliary contact C1 of a current relay C1, an auxiliary contact a2 of a current relay a2, an auxiliary contact B2 of a current relay B2 and an auxiliary contact C2 of a current relay C2 which are connected in parallel with each other are connected with the intermediate relay J0.
As a further optimization of the scheme, the locking device comprises an intermediate relay JH, an auxiliary switch JH2 of the intermediate relay JH and an auxiliary switch J0 of an intermediate relay J0 which are connected in parallel, a reset switch SB and an auxiliary switch JH1 of the intermediate relay JH.
As a further optimization of the scheme, the first section of the incoming line switch opening loop comprises an auxiliary contact A3 of a voltage relay A3 and an auxiliary contact a5 of a voltage relay A5 which are connected in series, an auxiliary contact B3 of a voltage relay B3 and an auxiliary contact B5 of a voltage relay B5 which are connected in series, and an auxiliary contact C3 of a voltage relay C3 and an auxiliary contact C5 of a voltage relay C5 which are connected in series; the series branch of the auxiliary contact of the three-phase circuit is connected in parallel and then is connected with an intermediate relay J1.
As a further optimization of the scheme, the two-stage incoming line switch opening loop comprises an auxiliary contact a4 of a voltage relay A4 and an auxiliary contact a6 of a voltage relay A6 which are connected in series, an auxiliary contact B4 of a voltage relay B4 and an auxiliary contact B6 of a voltage relay B6 which are connected in series, and an auxiliary contact C4 of a voltage relay C4 and an auxiliary contact C6 of a voltage relay C6 which are connected in series; the series branch of the auxiliary contact of the three-phase circuit is connected in parallel and then is connected with an intermediate relay J2.
In a further optimization mode, the closing circuit of the bus coupler switch comprises an auxiliary contact J1 of an intermediate relay J1 and an auxiliary contact J2 of an intermediate relay J2 which are connected in parallel and then connected with the intermediate relay J3, and the intermediate relay J3 is connected with an auxiliary contact J11 of an intermediate relay J1 and an auxiliary contact J22 of the intermediate relay J2 which are connected in parallel.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model discloses at the circuit structure automatic switch-over in-process of two power double bus-bar strip female antithetical couplet, the accurate judgement loses the electric signal and is that the power is lost to the primary circuit and leads to, still secondary circuit loses the power and leads to, correctly controls dual power switching process, causes unnecessary undulant of voltage when avoiding automatic switch-over. The uninterrupted power supply of the double power sources is realized, and a safer and more reliable power supply guarantee is provided for key loads.
Drawings
Fig. 1 is a schematic diagram of a circuit structure for completing automatic switching of a dual-power dual-bus-bar connection provided by the present invention electromagnetically;
fig. 2 is a schematic view of a current sampling loop of a circuit structure for electromagnetically completing automatic switching of a dual-power dual-bus-bar connection provided by the present invention;
fig. 3 is a schematic diagram of a voltage sampling circuit of a circuit structure for electromagnetically completing automatic switching of a dual-power dual-bus-bar connection provided by the present invention;
fig. 4 is the utility model provides a pair of the circuit structure's of dual power supply double bus-bar belt bus-tie automatic switch-over logic control circuit schematic diagram is accomplished to electromagnetic type.
Detailed Description
The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that the functions, methods, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.
In the description of the present embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
Referring to fig. 1-4, a circuit structure for electromagnetically completing automatic switching of a dual-power dual-bus with bus connection comprises a current sampling loop, a voltage sampling loop and a logic control loop, wherein the current sampling loop is provided with two groups of current transformers and two groups of current relays, the two groups of current transformers are respectively arranged on a section of bus and a section of bus, and the first group of current relays is connected to the secondary side of the current transformer of the section of bus and is used for collecting three-phase current of the section of bus; and the second group of current relays are connected to the secondary side of the two-section bus current transformer and are used for collecting the three-phase current of the two-section bus.
When the power system has the phenomenon of symmetrical overcurrent or asymmetrical overcurrent, the current relay acts to lock the device, and the device is manually reset after fault processing.
The voltage sampling loop is provided with two groups of voltage transformers and four groups of voltage relays; the first group of voltage transformers comprises a voltage transformer PT1 and a voltage transformer PT3 which are connected to the first section of bus, and the second group of voltage transformers comprises a voltage transformer PT2 and a voltage transformer PT4 which are connected to the second section of bus; the first group of voltage relays are connected to the secondary side of the voltage transformer PT1, and the second group of voltage relays are connected to the secondary side of the voltage transformer PT3 and are used for collecting three-phase voltage of a section of bus; the third group of voltage relays are connected to the secondary side of the voltage transformer PT2, and the fourth group of voltage relays are connected to the secondary side of the voltage transformer PT4 and are used for collecting three-phase voltage of the two-section bus.
When the voltage loss phenomenon occurs in the power system, the corresponding voltage relay acts to judge whether the symmetrical voltage loss or the asymmetrical voltage loss, the primary voltage loss or the secondary voltage loss, and the logic control loop forms a control part to control an outlet execution element and sends an instruction of separating incoming lines and closing a bus coupler switch.
The logic control loop is used for judging faults and performing switching-on and switching-off operations, and comprises the following components in parallel connection:
the locking device is used for disconnecting the direct-current power supply when the first section of bus circuit or the second section of bus circuit has symmetrical overcurrent or asymmetrical overcurrent;
the high-current locking loop is used for receiving a symmetrical overcurrent or asymmetrical overcurrent signal generated in the first section of bus loop or the second section of bus loop and sending an instruction to the locking device;
the first section of the incoming line switch opening loop is used for opening operation when three-phase symmetrical voltage loss or asymmetrical voltage loss occurs in the first section of the bus loop;
the two-section incoming line switch opening loop is used for opening operation when three-phase symmetrical voltage loss or asymmetrical voltage loss occurs in the two-section bus loop;
and the bus coupler switch closing circuit is used for the bus coupler switch closing operation when three-phase symmetrical voltage loss or asymmetrical voltage loss occurs in the first section of bus circuit or the second section of bus circuit.
The current transformer comprises a current transformer TAa, a current transformer TAb and a current transformer TAC which are respectively connected to three phases, the first group of current relays comprise a current relay A1, a current relay B1 and a current relay C1, and the current relays are respectively connected to the secondary sides of the first section of bus current transformer TAa, the current transformer TAb and the current transformer TAC; the second group of current relays comprise a2, a B2 and a C2, and are respectively connected to the secondary sides of a two-section bus current transformer TAa, a current transformer TAb and a current transformer TAC;
the first group of voltage relays comprises a voltage relay A3, a voltage relay B3 and a voltage relay C3; the second group of voltage relays comprises a voltage relay A4, a voltage relay B4 and a voltage relay C4; the third group of voltage relays comprises a voltage relay A5, a voltage relay B5 and a voltage relay C5; the fourth group of voltage relays comprises a voltage relay A6, a voltage relay B6 and a voltage relay C6.
The large-current latching circuit comprises an intermediate relay J0, wherein an auxiliary contact a1 of a current relay A1, an auxiliary contact B1 of a current relay B1, an auxiliary contact C1 of a current relay C1, an auxiliary contact a2 of the current relay A2, an auxiliary contact B2 of the current relay B2 and an auxiliary contact C2 of the current relay C2 which are connected with each other in parallel are connected with the intermediate relay J0. The locking device comprises an intermediate relay JH, an auxiliary switch JH2 of the intermediate relay JH, an auxiliary switch J0 of the intermediate relay J0, a reset switch SB and an auxiliary switch JH1 of the intermediate relay JH which are connected in sequence.
The utility model discloses a dual power supply double bus-bar area bus-tie automatic switch-over's circuit structure's switching principle is accomplished to the electromagnetic type is:
when the phenomenon of symmetric overcurrent or asymmetric overcurrent occurs in a section of bus of the power system, the current transformer TAa connected with the section of bus, the short-circuit fault large-current signal is collected by a current transformer TAb and a current transformer TAC, a section of bus current relay A1, a current relay B1 and a current relay C1 act, an auxiliary contact a1 of a section of bus current relay A1 in a large-current locking loop of a logic control loop, an auxiliary contact B1 of a current relay B1, an auxiliary contact C1 of a current relay C1 is changed from a disconnected state to a closed state, an intermediate relay J0 of the large-current locking loop is electrically operated, an auxiliary contact J0 of the J0 is changed from a normally open state to a closed state, an intermediate relay JH of a locking device is electrically operated, an auxiliary contact JH2 of an intermediate relay JH is changed from a normally open state to a closed state, another auxiliary contact JH1 of the intermediate relay JH is changed from a normally closed state to a normally open state, and. After the fault is processed, the manual key button SB can be used for resetting, and the normal operation state is recovered.
In the same principle, when the phenomenon of symmetric overcurrent or asymmetric overcurrent occurs in a two-section bus of the power system, a short-circuit fault large-current signal is acquired by a current transformer TAa, a current transformer TAb and a current transformer TAC which are connected to the two-section bus, a section of bus current relay A2, a current relay B2 and a current relay C2 act, an auxiliary contact a2 of a section of bus current relay A2, an auxiliary contact B2 of a current relay B2 and an auxiliary contact C2 of the current relay C2 in a large-current locking loop of a logic control loop are switched to be closed from an open state, a large-current locking loop intermediate relay J0 is powered to act, and the action of a locking device is the same as that of the section of bus when the section of bus fails.
The first section of the incoming line switch opening loop comprises an auxiliary contact A3 of a voltage relay A3 and an auxiliary contact a5 of a voltage relay A5 which are connected in series, an auxiliary contact B3 of a voltage relay B3 and an auxiliary contact B5 of a voltage relay B5 which are connected in series, and an auxiliary contact C3 of a voltage relay C3 and an auxiliary contact C5 of a voltage relay C5 which are connected in series; the series branch of the auxiliary contact of the three-phase circuit is connected in parallel and then is connected with an intermediate relay J1.
The two-stage incoming line switch opening loop comprises an auxiliary contact a4 of a voltage relay A4 and an auxiliary contact a6 of a voltage relay A6 which are connected in series, an auxiliary contact B4 of a voltage relay B4 and an auxiliary contact B6 of a voltage relay B6 which are connected in series, and an auxiliary contact C4 of a voltage relay C4 and an auxiliary contact C6 of a voltage relay C6 which are connected in series; the series branch of the auxiliary contact of the three-phase circuit is connected in parallel and then is connected with an intermediate relay J2.
The closing circuit of the bus coupler switch comprises an auxiliary contact J1 of an intermediate relay J1 and an auxiliary contact J2 of an intermediate relay J2 which are connected in parallel and then connected with the intermediate relay J3, and an auxiliary contact J11 of an intermediate relay J1 and an auxiliary contact J22 of an intermediate relay J2 which are connected in parallel are connected with the intermediate relay J3.
When the two-section bus is normally electrified, the auxiliary contact A3 of the voltage relay A3, the auxiliary contact a5 of the voltage relay A5, the auxiliary contact B3 of the voltage relay B3, the auxiliary contact B5 of the voltage relay B5, the auxiliary contact C3 of the voltage relay C3, the auxiliary contact C5 of the voltage relay C5, the auxiliary contact a4 of the voltage relay A4, the auxiliary contact A6 of the voltage relay A6, the auxiliary contact B4 of the voltage relay B4, the auxiliary contact B6 of the voltage relay B6, the auxiliary contact C4 of the voltage relay C4 and the auxiliary contact C6 of the voltage relay C6 are all in a normally closed state and are changed into an open state.
When three-phase symmetrical voltage loss or asymmetrical voltage loss occurs in a primary circuit of a section of bus, a voltage transformer PT1 and a voltage transformer PT3 connected to a section of bus cannot acquire voltage signals, a section of bus voltage relay A3, a voltage relay A5, a voltage relay B3, a voltage relay B5, a voltage relay C3 and a voltage relay C5 act, an auxiliary contact A3 of a voltage relay A3, an auxiliary contact a5 of a voltage relay A5, an auxiliary contact B3 of a voltage relay B3, an auxiliary contact B5 of a voltage relay B5, an auxiliary contact C3 of a voltage relay C3 and an auxiliary contact C5 of a voltage relay C5 in a section of incoming line breaker open circuit are switched off, an intermediate relay J1 in the section of bus incoming line breaker open circuit is powered on to act, and a section of bus incoming line switch cabinet is switched off. Meanwhile, in the closing circuit of the bus coupler switch, due to the action of the intermediate relay J1, the normally closed contact J1 corresponding to the intermediate relay J1 is changed from closed to open, the normally open contact J11 is changed from open to closed, the intermediate relay J3 of the closing circuit of the bus coupler switch breaker is electrified to act, and the first bus coupler switch and the second bus coupler switch are closed. A series of switching operations after the three-phase symmetrical voltage loss or the asymmetrical voltage loss of the section of the bus are completed, and the function of continuous power supply is realized.
Similarly, when three-phase symmetrical voltage loss or asymmetrical voltage loss occurs in a primary circuit of a two-section bus, a voltage transformer PT2 and a voltage transformer PT4 connected to the two-section bus cannot acquire voltage signals, a first-section bus voltage relay A4, a voltage relay A6, a voltage relay B4, a voltage relay B6, a voltage relay C4 and a voltage relay C6 act, an auxiliary contact a4 of the voltage relay A4 and an auxiliary contact a6 of the voltage relay A6 in a first-section incoming line switch separating circuit, an auxiliary contact B4 of the voltage relay B4 and an auxiliary contact B6 of the voltage relay B6, an auxiliary contact C4 of the voltage relay C4 and an auxiliary contact C6 of the voltage relay C6 are turned off, an intermediate relay J2 of the two-section bus incoming line breaker separating circuit is powered on and the incoming line of the two-section bus switch cabinet is disconnected. Meanwhile, in the closing circuit of the bus coupler switch, due to the action of the intermediate relay J2, the normally closed contact J2 corresponding to the intermediate relay J2 is changed from closed to open, the normally open contact J22 is changed from open to closed, the intermediate relay J3 of the closing circuit of the bus coupler switch breaker is electrified to act, and the first bus coupler switch and the second bus coupler switch are closed. A series of switching operations after the three-phase symmetrical voltage loss or the asymmetrical voltage loss of the section of the bus are completed, and the function of continuous power supply is realized.
No matter one section of bus primary loop or two sections of bus primary loops are in voltage loss, the two voltage transformers arranged on the bus are in voltage loss, and the condition that the primary loop is in power loss is indicated; if the secondary circuit is power-off, only one voltage transformer on the bus is power-off, and the bus coupler should not act. The utility model discloses can effectively distinguish that primary circuit loses the electricity or secondary circuit loses the electricity, effectively avoid secondary circuit broken string to lose the electricity and arouse the female switch malfunction that allies oneself with, cause the unnecessary fluctuation of system voltage.
The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A circuit structure for completing automatic switching of a dual-power double-bus with bus connection in an electromagnetic mode comprises a current sampling loop, a voltage sampling loop and a logic control loop, and is characterized in that the current sampling loop is provided with two groups of current transformers and two groups of current relays, the two groups of current transformers are respectively arranged on a section of bus and a section of bus, and the first group of current relays is connected to the secondary side of the current transformer of the section of bus and used for collecting three-phase current of the section of bus; the second group of current relays are connected to the secondary side of the two-section bus current transformer and used for collecting three-phase current of the two-section bus;
the voltage sampling loop is provided with two groups of voltage transformers and four groups of voltage relays; the first group of voltage transformers comprises a voltage transformer PT1 and a voltage transformer PT3 which are connected to the first section of bus, and the second group of voltage transformers comprises a voltage transformer PT2 and a voltage transformer PT4 which are connected to the second section of bus; the first group of voltage relays are connected to the secondary side of the voltage transformer PT1, and the second group of voltage relays are connected to the secondary side of the voltage transformer PT3 and are used for collecting three-phase voltage of a section of bus; the third group of voltage relays are connected to the secondary side of the voltage transformer PT2, and the fourth group of voltage relays are connected to the secondary side of the voltage transformer PT4 and are used for collecting three-phase voltage of a two-section bus;
the logic control loop is used for judging faults and performing switching-on and switching-off operations, and comprises the following components in parallel connection:
the locking device is used for disconnecting the direct-current power supply when the first section of bus circuit or the second section of bus circuit has symmetrical overcurrent or asymmetrical overcurrent;
the high-current locking circuit is used for receiving a symmetrical overcurrent or asymmetrical overcurrent signal generated in the first section of bus circuit or the second section of bus circuit and sending an instruction to the locking device;
the first section of the incoming line switch opening loop is used for opening operation when three-phase symmetrical voltage loss or asymmetrical voltage loss occurs in the first section of the bus loop;
the two-section incoming line switch opening loop is used for opening operation when three-phase symmetrical voltage loss or asymmetrical voltage loss occurs in the two-section bus loop;
and the bus coupler switch closing circuit is used for the bus coupler switch closing operation when three-phase symmetrical voltage loss or asymmetrical voltage loss occurs in the first section of bus circuit or the second section of bus circuit.
2. The circuit structure for electromagnetically completing the automatic switching of the dual-power-supply dual-bus-bar connection of claim 1, wherein the current transformers comprise a current transformer TAa, a current transformer TAb and a current transformer TAC which are respectively connected to three phases, and the first group of current relays comprise a current relay A1, a current relay B1 and a current relay C1 which are respectively connected to the secondary sides of the segment of bus current transformer TAa, the current transformer TAb and the current transformer TAC; the second group of current relays comprises A2, a current relay B2 and a current relay C2 which are respectively connected to the secondary sides of the two-section bus current transformer TAa, the current transformer TAb and the current transformer TAC;
the first group of voltage relays comprises a voltage relay A3, a voltage relay B3 and a voltage relay C3; the second group of voltage relays comprises a voltage relay A4, a voltage relay B4 and a voltage relay C4; the third group of voltage relays comprises a voltage relay A5, a voltage relay B5 and a voltage relay C5; the fourth group of voltage relays comprises a voltage relay A6, a voltage relay B6 and a voltage relay C6.
3. The circuit structure for electromagnetically completing the automatic switching of the dual-power-supply dual-bus-bar connection of the claim 1, wherein the high-current blocking loop comprises an intermediate relay J0, and the intermediate relay J0 is connected with an auxiliary contact a1 of the current relay A1, an auxiliary contact B1 of the current relay B1, an auxiliary contact C1 of the current relay C1, an auxiliary contact a2 of the current relay A2, an auxiliary contact B2 of the current relay B2 and an auxiliary contact C2 of the current relay C2 which are connected in parallel with each other.
4. The circuit structure for electromagnetically completing automatic switching of the dual-power double-bus-bar connection of claim 3, wherein the locking device comprises an intermediate relay JH, an auxiliary switch JH2 of the intermediate relay JH, an auxiliary switch J0 of the intermediate relay J0, a reset switch SB and an auxiliary switch JH1 of the intermediate relay JH, which are connected in sequence.
5. The circuit structure for electromagnetically completing the automatic switching of the dual-power-supply dual-bus-bar coupler according to claim 1, wherein the first section of the incoming switch opening loop comprises an auxiliary contact A3 of a voltage relay A3 and an auxiliary contact a5 of a voltage relay A5 which are connected in series, an auxiliary contact B3 of a voltage relay B3 and an auxiliary contact B5 of a voltage relay B5 which are connected in series, and an auxiliary contact C3 of a voltage relay C3 and an auxiliary contact C5 of a voltage relay C5 which are connected in series; the series branch of the auxiliary contact of the three-phase circuit is connected in parallel and then is connected with an intermediate relay J1.
6. The circuit structure for electromagnetically completing the automatic switching of the dual-power-supply dual-bus-bar coupler according to claim 5, wherein the two-section incoming line switch opening loop comprises an auxiliary contact a4 of a voltage relay A4 and an auxiliary contact a6 of a voltage relay A6 which are connected in series, an auxiliary contact B4 of a voltage relay B4 and an auxiliary contact B6 of a voltage relay B6 which are connected in series, and an auxiliary contact C4 of a voltage relay C4 and an auxiliary contact C6 of a voltage relay C6 which are connected in series; the series branch of the auxiliary contact of the three-phase circuit is connected in parallel and then is connected with an intermediate relay J2.
7. The circuit structure of claim 5, wherein the closing circuit of the bus coupler switch comprises an auxiliary contact J1 of the intermediate relay J1 and an auxiliary contact J2 of the intermediate relay J2 connected in parallel, and then the intermediate relay J3 is connected, and the intermediate relay J3 is connected with an auxiliary contact J11 of the intermediate relay J1 and an auxiliary contact J22 of the intermediate relay J2 connected in parallel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021139448.9U CN212462756U (en) | 2020-06-18 | 2020-06-18 | Circuit structure for completing automatic switching of double-power-supply double-bus with bus coupler in electromagnetic mode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021139448.9U CN212462756U (en) | 2020-06-18 | 2020-06-18 | Circuit structure for completing automatic switching of double-power-supply double-bus with bus coupler in electromagnetic mode |
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| CN212462756U true CN212462756U (en) | 2021-02-02 |
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2020
- 2020-06-18 CN CN202021139448.9U patent/CN212462756U/en active Active
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