CN108574279B - Double-bus switching misoperation prevention control device and double-bus power supply system - Google Patents
Double-bus switching misoperation prevention control device and double-bus power supply system Download PDFInfo
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Abstract
The invention relates to a double-bus switching misoperation prevention control device and a double-bus power supply system, wherein the control device comprises a control branch circuit, the control branch circuit comprises a first control circuit and a second control circuit which are arranged in parallel, a first electromagnetic lock corresponding to a first power supply isolating switch is arranged on the first control circuit in series, and a second electromagnetic lock corresponding to a second power supply isolating switch is arranged on the second control circuit in series. According to the relation of electromagnetic lock and power supply isolator, realize the locking control, only be in under the closed condition at first power supply isolator, can operate second power supply isolator, only can operate first power supply isolator after the second power supply isolator is closed, guarantee the correct operation order of two power supply isolators, stop the maloperation that the load was pulled out, avoid the accident that produces because of the maloperation, increased the security of its place electric power system, the reliability of power supply provides the guarantee for operating personnel's safety.
Description
Technical Field
The invention relates to a double-bus switching misoperation prevention control device and a double-bus power supply system.
Background
Bus bars are products used to transfer electrical energy, with the ability to collect, transfer and distribute electrical power. In an electrical power system, a bus connects branch circuits in a power distribution device together, and distributes and transmits electrical energy to the branch circuits. In order to ensure that the bus is more reliable in supplying power to the branch circuit, the power system is flexible in dispatching and convenient in extension, and the branch circuit is not powered off when the bus is overhauled, the power system is mainly connected by adopting double buses. For example, chinese patent document CN207149898U discloses a dual bus power supply system, which includes at least one connection loop and at least one branch loop, the connection loop includes two connection disconnectors and one connection breaker, two ends of the connection loop are respectively connected with two buses, so as to realize connection of the two buses. The branch circuit also comprises two power supply disconnectors (respectively called a first power supply disconnector and a second power supply disconnector) and a power supply circuit breaker, which are connected to the two buses via the power supply circuit breaker and the two power supply disconnectors. When two contact isolating switches (called a first contact isolating switch and a second contact isolating switch respectively) and a contact breaker are closed, the switching and switching of the double buses are realized by operating the two power supply isolating switches on the branch circuit.
When the bus is required to be overhauled, the double buses are controlled to perform switching operation, however, the existing switching operation flow is quite complex, misoperation is easy to occur, and then safety accidents occur.
Disclosure of Invention
The invention aims to provide a double-bus switching misoperation prevention control device, which is used for solving the problem that the existing double-bus switching operation is easy to cause misoperation. The invention also provides a double-bus power supply system.
In order to achieve the above object, the present invention includes the following technical solutions.
The double-bus switching misoperation prevention control device comprises a control branch circuit led out by a power supply, wherein the control branch circuit comprises a first control circuit and a second control circuit which are arranged in parallel, the first control circuit comprises a second auxiliary switch corresponding to a second power supply isolating switch on a branch circuit, the second control circuit comprises a first auxiliary switch corresponding to a first power supply isolating switch on the branch circuit, the first control circuit is connected with the second auxiliary switch and a first electromagnetic lock corresponding to the first auxiliary switch in series, and the second control circuit is connected with the first auxiliary switch and a second electromagnetic lock corresponding to the second auxiliary switch in series; the first power isolation switch can be operated when the first electromagnetic lock is powered on, and the second power isolation switch can be operated when the second electromagnetic lock is powered on.
When the switching operation is performed, the connection loop is conducted. Because the first power supply isolating switch is in the closed state, the second power supply isolating switch is in the open state, then the first auxiliary switch is also in the closed state, the second auxiliary switch is in the open state, the first electromagnetic lock is in the power-off state, the second electromagnetic lock is in the power-on state, the first power supply isolating switch cannot be operated, the second power supply isolating switch can be operated, then the second power supply isolating switch is closed, the second auxiliary switch can be closed, the first electromagnetic lock is powered on, at the moment, the first power supply isolating switch can be operated, then the first power supply isolating switch is opened, the connecting loop is opened, and the switching operation is completed. Therefore, two electromagnetic locks are arranged, locking control is realized according to the relation between the electromagnetic locks and the power supply isolating switch, and the second power supply isolating switch can be operated only when the second electromagnetic lock is electrified under the condition that the first power supply isolating switch is in a closed state, and the first power supply isolating switch cannot be operated, namely, the first power supply isolating switch cannot be opened first and then the second power supply isolating switch cannot be closed. And the first electromagnetic lock is only electrified after the second power supply isolating switch is closed, so that the first power supply isolating switch can be operated. Therefore, the double-bus switching misoperation prevention control device provided by the scheme is additionally provided with the locking control, so that the correct operation sequence of the two power supply isolating switches is ensured, the operation programmability of operators during switching operation is ensured, the misoperation of load switching is avoided, accidents caused by misoperation are avoided, the safety of a power system in which the double-bus switching misoperation prevention control device is arranged is improved, the reliability of power supply is improved, and the safety of the operators is ensured.
Further, the control device further comprises a power supply control module, the power supply control module comprises a third auxiliary switch corresponding to the first interconnection isolating switch in the interconnection loop, a fourth auxiliary switch corresponding to the second interconnection isolating switch in the interconnection loop, a fifth auxiliary switch corresponding to the interconnection breaker in the interconnection loop and a control unit, the third auxiliary switch, the fourth auxiliary switch and the fifth auxiliary switch are connected with the control unit, the control unit outputs the power supply, and when the third auxiliary switch, the fourth auxiliary switch and the fifth auxiliary switch are all closed, the control unit outputs the power supply.
The power supply control module is used for supplying power to the control branch circuit only when the connecting loop is conducted, that is, switching operation can be realized only when the connecting loop is conducted, switching operation is performed when the connecting loop is not conducted, power supply safety is further guaranteed, and accidents caused by misoperation are avoided again. Moreover, under normal conditions, the interconnection loop is disconnected, the control branch is not provided with a power supply, and the first electromagnetic lock and the second electromagnetic lock are powered off, so that the first power supply isolating switch and the second power supply isolating switch cannot be operated, and misoperation lines are avoided.
Further, the control unit is a power supply control circuit, one end of the control branch is connected with the positive electrode of the power supply, the other end of the control branch is connected with one end of the power supply control circuit, the other end of the power supply control circuit is connected with the negative electrode of the power supply, and the third auxiliary switch, the fourth auxiliary switch and the fifth auxiliary switch are connected in series on the power supply control circuit. The control unit is only one power supply control line, so that the circuit complexity is reduced, and the control reliability is improved.
Further, the control device further comprises a third control circuit, a third electromagnetic lock corresponding to the third auxiliary switch and a sixth auxiliary switch corresponding to a communication breaker in the communication loop are connected in series on the third control circuit, a fourth electromagnetic lock corresponding to the fourth auxiliary switch is connected in parallel with the third electromagnetic lock, and the switching state of the sixth auxiliary switch is opposite to that of the communication breaker; the first interconnecting isolating switch can be operated when the third electromagnetic lock is powered on, and the second interconnecting isolating switch can be operated when the fourth electromagnetic lock is powered on.
The double-bus switching misoperation prevention control device comprises a control branch circuit led out by a power supply, wherein the control branch circuit comprises a first control circuit and a second control circuit which are arranged in parallel, the first control circuit comprises a second auxiliary switch corresponding to the second power supply isolating switch, the second control circuit comprises a first auxiliary switch corresponding to the first power supply isolating switch, a first electromagnetic lock corresponding to the first auxiliary switch, and the second control circuit comprises a first power supply isolating switch, a second power supply isolating switch and a power supply breaker; the first power isolation switch can be operated when the first electromagnetic lock is powered on, and the second power isolation switch can be operated when the second electromagnetic lock is powered on.
Further, the control device further comprises a power supply control module, the power supply control module comprises a third auxiliary switch corresponding to the first interconnection isolating switch, a fourth auxiliary switch corresponding to the second interconnection isolating switch, a fifth auxiliary switch corresponding to the interconnection breaker and a control unit, the third auxiliary switch, the fourth auxiliary switch and the fifth auxiliary switch are connected with the control unit, the control unit outputs the power supply, and when the third auxiliary switch, the fourth auxiliary switch and the fifth auxiliary switch are all closed, the control unit outputs the power supply.
Further, the control unit is a power supply control circuit, one end of the control branch is connected with the positive electrode of the power supply, the other end of the control branch is connected with one end of the power supply control circuit, the other end of the power supply control circuit is connected with the negative electrode of the power supply, and the third auxiliary switch, the fourth auxiliary switch and the fifth auxiliary switch are connected in series on the power supply control circuit.
Further, the control device further comprises a third control circuit, a third electromagnetic lock corresponding to the third auxiliary switch and a sixth auxiliary switch corresponding to a communication breaker in the communication loop are connected in series on the third control circuit, a fourth electromagnetic lock corresponding to the fourth auxiliary switch is connected in parallel with the third electromagnetic lock, and the switching state of the sixth auxiliary switch is opposite to that of the communication breaker; the first interconnecting isolating switch can be operated when the third electromagnetic lock is powered on, and the second interconnecting isolating switch can be operated when the fourth electromagnetic lock is powered on.
Drawings
FIG. 1 is a double bus primary loop diagram;
FIG. 2 is a control branch diagram;
FIG. 3 is a power supply control circuit diagram;
fig. 4 is a third control circuit diagram.
Detailed Description
Dual bus power supply system embodiment
The embodiment provides a double-bus power supply system, which comprises a main loop and a control part, wherein the main loop is a double-bus primary main loop, and the control part is a double-bus switching misoperation prevention control device.
The primary main circuit of the double bus belongs to the existing circuit structure, such as the double bus power supply system disclosed in China patent document with the grant publication number of CN 207149898U. In this embodiment, a specific structure of a primary loop of a double bus is provided, where the primary loop of the double bus includes at least one connection loop and at least one branch loop, and in this embodiment, the primary loop of the double bus includes one connection loop and one branch loop, as shown in fig. 1, for example. Of course, when the double-bus primary main circuit includes a plurality of connection circuits and branch circuits, the double-bus switching anti-misoperation control device needs to be provided with a plurality of connection circuits, for example, the same number as the branch circuits, and each double-bus switching anti-misoperation control device controls the corresponding branch circuit, but no matter how many connection circuits and branch circuits are included in the double-bus primary main circuit, the control principle is the same as the case of including one connection circuit and branch circuit.
As shown in fig. 1, the branch circuit includes a first power supply isolation switch (corresponding to the power supply isolation switch 1G in fig. 1), a second power supply isolation switch (corresponding to the power supply isolation switch 2G in fig. 1), and a power supply breaker 1QF. The interconnection loop comprises a first interconnection isolating switch (corresponding to the interconnection isolating switch 1GM in fig. 1), a second interconnection isolating switch (corresponding to the interconnection isolating switch 2GM in fig. 1) and an interconnection breaker 2QF which are arranged in series, and two ends of the interconnection loop are respectively connected with two buses.
As shown in fig. 2, the double-bus switching misoperation prevention control device comprises a control branch led out by a power supply, wherein the control branch comprises a first control circuit and a second control circuit which are arranged in parallel, the first control circuit comprises a second auxiliary switch corresponding to a power supply isolating switch 2G, and the second control circuit comprises a first auxiliary switch corresponding to the power supply isolating switch 1G. The switch state of the first auxiliary switch is the same as the switch state of the power supply isolating switch 1G, and the switch state of the second auxiliary switch is the same as the switch state of the power supply isolating switch 2G, so that the first auxiliary switch can adopt the same sign as the power supply isolating switch 1G, i.e. the first auxiliary switch is the auxiliary switch 1G, and the second auxiliary switch can adopt the same sign as the power supply isolating switch 2G, i.e. the second auxiliary switch is the auxiliary switch 2G. As shown in fig. 2, the first control line is connected in series with an auxiliary switch 2G and a first electromagnetic lock (corresponding to the electromagnetic lock 1DS in fig. 2), and the second control line is connected in series with an auxiliary switch 1G and a second electromagnetic lock (corresponding to the electromagnetic lock 2DS in fig. 2). In this embodiment, the electromagnetic lock is an electromagnetic lock corresponding to the operation panel of the power supply isolating switch. The electromagnetic lock 1DS corresponds to the auxiliary switch 1G, that is, corresponds to the power supply isolating switch 1G, and the power supply isolating switch 1G can be operated only when the electromagnetic lock 1DS is powered on, and the power supply isolating switch 1G cannot be operated when the electromagnetic lock 1DS is in a power-off state; the electromagnetic lock 2DS corresponds to the auxiliary switch 2G, that is, corresponds to the power supply disconnecting switch 2G, and the power supply disconnecting switch 2G can be operated only when the electromagnetic lock 2DS is powered on, and the power supply disconnecting switch 2G cannot be operated when the electromagnetic lock 2DS is in a power-off state.
Under normal conditions, 1 parent power is supplied, the power supply isolating switch 1G is in a closed state, and the power supply isolating switch 2G is in an open state. When switching operation is performed, each isolating switch and breaker in the connection loop are closed, and the connection loop is conducted. As shown in fig. 2, since the power supply isolating switch 1G is in a closed state, then the auxiliary switch 1G is also in a closed state, the electromagnetic lock 2DS is in a power-on state, then the power supply isolating switch 2G can be operated, then the power supply isolating switch 2G is closed, the auxiliary switch 2G is also closed, the electromagnetic lock 1DS is powered on, at this time, the power supply isolating switch 1G can be operated, then the power supply isolating switch 1G is opened, then the connection loop is opened, and the switching operation is completed. Therefore, the electromagnetic lock 1DS and the electromagnetic lock 2DS are provided, the locking control is realized according to the relation between the electromagnetic lock and the power supply isolating switch, the electromagnetic lock 1DS is electrified only when the power supply isolating switch 1G is in the closed state, the power supply isolating switch 2G can be operated, and the power supply isolating switch 1G cannot be operated, that is, the power supply isolating switch 1G cannot be opened first, the power supply isolating switch 2G cannot be closed again, and the power supply isolating switch 1G can only be closed first, and then the power supply isolating switch 1G can be opened. Therefore, the control circuit structure can ensure the correct operation sequence of the two power supply isolating switches, ensure the operation programmability of operators during switching operation and avoid misoperation of load switching.
Further, in order to realize that switching operation can be performed only when the connection loop is conducted, switching operation is prevented when the connection loop is not conducted, and the double-bus switching misoperation prevention control device further comprises a power supply control module for providing a power supply for the control branch in fig. 2. The power control module includes a third auxiliary switch corresponding to the tie isolation switch 1GM, a fourth auxiliary switch corresponding to the tie isolation switch 2GM, a fifth auxiliary switch corresponding to the tie breaker 2QF, and a control unit. As in the above, the switch state of the third auxiliary switch is the same as the switch state of the tie isolating switch 1GM, the switch state of the fourth auxiliary switch is the same as the switch state of the tie isolating switch 2GM, and the switch state of the fifth auxiliary switch is the same as the switch state of the tie circuit breaker 2QF, so that the third auxiliary switch may be represented by the auxiliary switch 1GM, the fourth auxiliary switch may be represented by the auxiliary switch 2GM, and the fifth auxiliary switch may be represented by the auxiliary switch 2QF. The auxiliary switch 1GM, the auxiliary switch 2GM and the auxiliary switch 2QF are connected with the control unit, the control unit outputs a power supply, and only when the auxiliary switch 1GM, the auxiliary switch 2GM and the auxiliary switch 2QF are all closed, the liaison loop is indicated to be put into operation, and the system needs to perform switching operation, so that the control unit outputs the power supply, provides electric energy for the control branch in FIG. 2, further realizes switching operation, further ensures power supply safety, and avoids accidents caused by misoperation.
The control unit may be a control chip, and may be controlled by an internal software program, or may be a specific hardware circuit structure. In this embodiment, the control unit is a hardware circuit structure, specifically a power supply control line. As shown in fig. 2, one end of the control branch is connected with the positive electrode +km of the power supply, the other end of the control branch is GBM, and as shown in fig. 3, one end of the power supply control circuit is GBM, that is, the other end of the control branch is connected with one end of the power supply control circuit, the other end of the power supply control circuit is connected with the negative electrode-KM of the power supply, and the auxiliary switch 1GM, the auxiliary switch 2GM and the auxiliary switch 2QF are arranged in series on the power supply control circuit. Then, as long as the auxiliary switch 1GM, the auxiliary switch 2GM and the auxiliary switch 2QF are all closed, the positive power +km and the negative power-KM form a path, and the control branch in fig. 2 is powered. Therefore, the GBM can be understood as a small added latch busbar, and latch control is realized, and when the auxiliary switch 1GM, the auxiliary switch 2GM, and the auxiliary switch 2QF are all in the closed state, the GBM is electrified.
Then, under normal conditions, 1 is powered by the master, the power supply isolating switch 1G is in a closed state, the power supply isolating switch 2G is in an open state, and since the interconnection isolating switches 1GM and 2GM and the interconnection breaker 2QF in the interconnection loop are in the open state, the power supply control circuit is disconnected, and then, the electromagnetic locks 1DS and 2DS are powered off, so that the power supply isolating switches 1G and 2G cannot be operated.
In addition, two electromagnetic locks, namely an electromagnetic lock 1DSM and an electromagnetic lock 2DSM, can be arranged and are electromagnetic locks corresponding to the isolating switch operation panel in the interconnection loop. The two electromagnetic locks respectively correspond to the interconnection isolating switch 1GM and the interconnection isolating switch 2GM, and the electromagnetic lock 1DSM corresponds to the auxiliary switch 1GM, that is, corresponds to the interconnection isolating switch 1GM, and the interconnection isolating switch 1GM can be operated only when the electromagnetic lock 1DSM is powered on; the electromagnetic lock 2DSM corresponds to the auxiliary switch 2GM, i.e. to the tie-breaker 2GM, which can be operated only when the electromagnetic lock 2DSM is powered. Moreover, the following policies are set: only when the tie breaker 2QF is opened, the electromagnetic locks 1DSM and 2DSM can be energized, and the tie disconnector 1GM and the tie disconnector 2GM can be operated. Then, as shown in fig. 4, the control device further includes a third control circuit, on which an electromagnetic lock 1DSM and a sixth auxiliary switch corresponding to the interconnection breaker 2QF are connected in series, where the electromagnetic lock 1DSM is connected in parallel with the electromagnetic lock 2DSM, and the switching state of the sixth auxiliary switch is opposite to the switching state of the interconnection breaker 2QF, and in fig. 4, the sixth auxiliary switch is denoted by a normally closed auxiliary switch 2QF, and when the interconnection breaker 2QF is opened, the normally closed auxiliary switch 2QF in fig. 4 is closed, and the electromagnetic lock 1DSM and the electromagnetic lock 2DSM are powered.
When overhauling the 1 master, when switching operation, the tie disconnecting switch 1GM, the tie disconnecting switch 2GM and the tie breaker 2QF need to be closed first. Since the electromagnetic locks 1DSM and 2DSM can only be energized when the tie breaker 2QF is opened, it is necessary to close the tie disconnector 1GM and the tie disconnector 2GM before the tie breaker 2QF is closed. After the tie breaker 2QF is closed, the electromagnetic locks 1DSM and 2DSM lose power, and the tie disconnector 1GM and the tie disconnector 2GM cannot be operated any more. After the contact isolating switch 1GM, the contact isolating switch 2GM and the contact breaker 2QF are closed, namely, the GBM busbar is electrified after the auxiliary switch 1GM, the auxiliary switch 2GM and the auxiliary switch 2QF are all closed, at the moment, the power supply isolating switch 1G is in a closed state, namely, the auxiliary switch 1G is in a closed state, then, the electromagnetic lock 2DS is electrified, and the power supply isolating switch 2G can be operated. Then, the power supply disconnecting switch 2G is closed, the electromagnetic lock 1DS is electrified, and the power supply disconnecting switch 1G can be operated, and then the power supply disconnecting switch 1G is opened. And finally, the interconnection breaker 2QF, the interconnection isolating switch 1GM and the interconnection isolating switch 2GM are sequentially disconnected, the switching is finished, and the master switch 2 is put into operation.
Therefore, the system uses the open/close states of the circuit breaker and the disconnecting switch as locking conditions, so that the disconnecting switch can only perform accurate next operation in various open/close states. In the whole switching process, the operation sequence of the isolating switch is strictly limited, so that the procedural performance of switching operation is ensured, and misoperation of on-load switching is prevented.
In the above embodiment, the setting purposes of the electromagnetic lock 1DSM and the electromagnetic lock 2DSM are: for the order of operation between the tie disconnector 1GM, the tie disconnector 2GM and the tie breaker 2QF, this is of course only an optimised embodiment, as other embodiments the electromagnetic lock 1DSM and the electromagnetic lock 2DSM may not be provided.
Specific embodiments are given above, but the invention is not limited to the described embodiments. The basic idea of the invention is that the above basic scheme, it is not necessary for a person skilled in the art to design various modified models, formulas, parameters according to the teaching of the invention to take creative effort. Variations, modifications, substitutions and alterations are also possible in the embodiments without departing from the principles and spirit of the present invention.
Double-bus switching misoperation prevention control device embodiment
The embodiment provides a double-bus switching misoperation prevention control device, which can be independently protected. Since the control device has been described in detail in the above system embodiments, this embodiment will not be described in detail.
Claims (2)
1. The double-bus switching misoperation prevention control device is characterized by comprising a control branch circuit led out by a power supply, wherein the control branch circuit comprises a first control circuit and a second control circuit which are arranged in parallel, the first control circuit comprises a second auxiliary switch corresponding to a second power supply isolating switch on a branch circuit, the second control circuit comprises a first auxiliary switch corresponding to a first power supply isolating switch on the branch circuit, the first control circuit is connected with the second auxiliary switch and a first electromagnetic lock corresponding to the first auxiliary switch in series, and the second control circuit is connected with the first auxiliary switch and a second electromagnetic lock corresponding to the second auxiliary switch in series; a first power isolation switch can be operated when the first electromagnetic lock is powered on, and a second power isolation switch can be operated when the second electromagnetic lock is powered on; the control device further comprises a power supply control module, wherein the power supply control module comprises a third auxiliary switch corresponding to a first interconnection isolating switch in the interconnection loop, a fourth auxiliary switch corresponding to a second interconnection isolating switch in the interconnection loop, a fifth auxiliary switch corresponding to an interconnection breaker in the interconnection loop and a control unit, the third auxiliary switch, the fourth auxiliary switch and the fifth auxiliary switch are connected with the control unit, the control unit outputs the power supply, and when the third auxiliary switch, the fourth auxiliary switch and the fifth auxiliary switch are all closed, the control unit outputs the power supply; the control unit is a power supply control circuit, one end of the control branch is connected with a positive power supply, the other end of the control branch is connected with one end of the power supply control circuit, the other end of the power supply control circuit is connected with a negative power supply, and the third auxiliary switch, the fourth auxiliary switch and the fifth auxiliary switch are arranged on the power supply control circuit in series; the control device further comprises a third control circuit, a third electromagnetic lock corresponding to the third auxiliary switch and a sixth auxiliary switch corresponding to a communication breaker in the communication loop are connected in series on the third control circuit, a fourth electromagnetic lock corresponding to the fourth auxiliary switch is connected in parallel with the third electromagnetic lock, and the switching state of the sixth auxiliary switch is opposite to that of the communication breaker; the first interconnecting isolating switch can be operated when the third electromagnetic lock is powered on, and the second interconnecting isolating switch can be operated when the fourth electromagnetic lock is powered on.
2. The double-bus switching misoperation prevention control device is characterized by comprising a control branch led out by a power supply, wherein the control branch comprises a first control circuit and a second control circuit which are arranged in parallel, the first control circuit comprises a second auxiliary switch corresponding to the second power supply isolation switch, the second control circuit comprises a first auxiliary switch corresponding to the first power supply isolation switch, a first lock corresponding to the first auxiliary switch, and a second electromagnetic lock corresponding to the second auxiliary switch, and the second control circuit comprises a first auxiliary switch and a second auxiliary lock corresponding to the first electromagnetic switch; a first power isolation switch can be operated when the first electromagnetic lock is powered on, and a second power isolation switch can be operated when the second electromagnetic lock is powered on; the control device further comprises a power supply control module, wherein the power supply control module comprises a third auxiliary switch corresponding to the first interconnection isolating switch, a fourth auxiliary switch corresponding to the second interconnection isolating switch, a fifth auxiliary switch corresponding to the interconnection breaker and a control unit, the third auxiliary switch, the fourth auxiliary switch and the fifth auxiliary switch are connected with the control unit, the control unit outputs the power supply, and when the third auxiliary switch, the fourth auxiliary switch and the fifth auxiliary switch are all closed, the control unit outputs the power supply; the control unit is a power supply control circuit, one end of the control branch is connected with a positive power supply, the other end of the control branch is connected with one end of the power supply control circuit, the other end of the power supply control circuit is connected with a negative power supply, and the third auxiliary switch, the fourth auxiliary switch and the fifth auxiliary switch are arranged on the power supply control circuit in series; the control device further comprises a third control circuit, a third electromagnetic lock corresponding to the third auxiliary switch and a sixth auxiliary switch corresponding to a communication breaker in the communication loop are connected in series on the third control circuit, a fourth electromagnetic lock corresponding to the fourth auxiliary switch is connected in parallel with the third electromagnetic lock, and the switching state of the sixth auxiliary switch is opposite to that of the communication breaker; the first interconnecting isolating switch can be operated when the third electromagnetic lock is powered on, and the second interconnecting isolating switch can be operated when the fourth electromagnetic lock is powered on.
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| Title |
|---|
| 隔离开关防误闭锁自控系统设计;董秀洁;庄惠震;;电工技术(第04期);第52-53页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108574279A (en) | 2018-09-25 |
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