CN113113252A - Electric locking loop with outlet intervals - Google Patents
Electric locking loop with outlet intervals Download PDFInfo
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- CN113113252A CN113113252A CN202110378290.3A CN202110378290A CN113113252A CN 113113252 A CN113113252 A CN 113113252A CN 202110378290 A CN202110378290 A CN 202110378290A CN 113113252 A CN113113252 A CN 113113252A
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- switch
- bus
- line
- auxiliary contact
- circuit breaker
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/20—Interlocking, locking, or latching mechanisms
- H01H9/26—Interlocking, locking, or latching mechanisms for interlocking two or more switches
Abstract
The embodiment of the invention discloses an electric locking loop with outlet intervals. The electrical latching circuit includes: the isolating switch electrical locking loop comprises a first bus side isolating switch control branch, a second bus side isolating switch control branch and a line side isolating switch control branch; the first bus side isolating switch control branch is used for controlling the first bus side isolating switch to be closed or opened; the second bus side isolating switch control branch is used for controlling the second bus side isolating switch to be closed or opened; and the line side isolating switch control branch is used for controlling the line side isolating switch to be switched on or switched off. Compared with the prior art, the embodiment of the invention avoids the occurrence of misoperation by controlling the connection and disconnection of the electric locking loop, thereby improving the reliability of power supply.
Description
Technical Field
The embodiment of the invention relates to the technical field of power engineering, in particular to an electric locking loop with outlet intervals.
Background
The transformer substation is an important component of a power grid, and equipment in the substation needs to be periodically subjected to power failure test and maintenance. The operator cuts off the power of the equipment to a maintenance state through switching operation, however, misoperation such as pulling and closing the isolating switch with load, switching and closing the isolating switch with grounding switch and the like may occur in the operation process. The occurrence of misoperation can cause equipment damage, prolong the power failure time, influence the power supply reliability and the like. Particularly, when accident handling is performed, the misoperation expands the accident range, and the power failure area is expanded.
Disclosure of Invention
The embodiment of the invention provides an electric locking loop with interval outgoing lines, so that misoperation is avoided by controlling the connection and disconnection of the electric locking loop, and the power supply reliability is improved.
In order to achieve the above purpose, the embodiment of the present invention provides the following technical solutions:
an outlet interval comprises a first bus side isolating switch, a second bus side isolating switch, a line side isolating switch, a circuit breaker and a current transformer, wherein the first bus side isolating switch and the second bus side isolating switch are used for electrically connecting a first bus and a second bus with the circuit breaker respectively; the circuit breaker, the current transformer and the line side disconnecting switch are connected in series; the outgoing line interval also comprises a circuit breaker bus side grounding switch, a circuit breaker current transformer side grounding switch and a line grounding switch which are respectively used for circuit breaker bus side grounding, circuit breaker current transformer side grounding and line grounding;
the electrical latching circuit includes:
the isolating switch electrical locking loop comprises a first bus side isolating switch control branch, a second bus side isolating switch control branch and a line side isolating switch control branch; the first bus side disconnecting switch control branch is used for controlling the first bus side disconnecting switch to carry out on-off control or off-off control when the circuit breaker is at an opening position, and the circuit breaker bus side grounding switch, the circuit breaker current transformer side grounding switch and the second bus side disconnecting switch are at an opening position; the second bus side disconnecting switch control branch is used for controlling the second bus side disconnecting switch to carry out on-off control or off-off control when the circuit breaker is at an opening position, and the circuit breaker bus side grounding switch, the circuit breaker current transformer side grounding switch and the first bus side disconnecting switch are at an opening position; the line side disconnecting switch control branch is used for controlling the line side disconnecting switch to carry out on-off control or off-off control when the circuit breaker is at an opening position, and the circuit breaker bus side grounding switch, the circuit breaker current transformer side grounding switch and the line side disconnecting switch are at an opening position;
the first grounding electric locking loop is used for controlling the circuit breaker bus-side grounding switch and the circuit breaker current transformer-side grounding switch to be switched on or switched off when the circuit breaker is in the opening position and the first bus-side isolating switch, the second bus-side isolating switch and the line-side isolating switch are in the opening position;
and the second grounding electric locking loop is used for controlling the line grounding switch to carry out closing control or opening control when the line side isolating switch is in an opening position when no electricity is detected in the line.
Optionally, the electrical blocking circuit of the disconnector comprises:
the first bus side isolating switch control module, the second bus side isolating switch control module and the line side isolating switch control module are respectively used for controlling the first bus side isolating switch, the second bus side isolating switch and the line side isolating switch to carry out on-off control or off-off control when a power supply is connected;
the circuit breaker comprises an air switch, a three-phase auxiliary contact of the circuit breaker, an auxiliary contact of a grounding switch on a bus side of the circuit breaker, an auxiliary contact of a grounding switch on a current transformer side of the circuit breaker, a first auxiliary contact of a disconnecting switch on a second bus side, a first auxiliary contact of a disconnecting switch on the first bus side and an auxiliary contact of a grounding switch of a circuit;
wherein a first end of the air switch is electrically connected with a first power line, a second end of the air switch is electrically connected with a first end of a three-phase auxiliary contact of the circuit breaker, the second end of the three-phase auxiliary contact of the circuit breaker is electrically connected with the first end of the auxiliary contact of the grounding switch on the bus side of the circuit breaker, a second end of the auxiliary contact of the circuit breaker busbar-side grounding switch is electrically connected with a first end of the auxiliary contact of the circuit breaker current transformer-side grounding switch, a second end of the auxiliary contact of the circuit breaker current transformer side grounding switch is electrically connected with a first end of the first auxiliary contact of the second bus side disconnecting switch, the second end of the first auxiliary contact of the second bus-side isolating switch is electrically connected with the first power input end of the first bus-side isolating switch control module, the power output end of the first bus side isolating switch control module is electrically connected with a second power line;
a first end of a first auxiliary contact of the first bus side disconnecting switch is electrically connected with a second end of an auxiliary contact of the grounding switch on the side of the circuit breaker current transformer, a second end of the first auxiliary contact of the first bus side disconnecting switch is electrically connected with a first power supply input end of the second bus side disconnecting switch control module, and a power supply output end of the second bus side disconnecting switch control module is electrically connected with a third power supply line;
the first end of the auxiliary contact of the line grounding switch is electrically connected with the second end of the auxiliary contact of the circuit breaker current transformer side grounding switch, the second end of the auxiliary contact of the line grounding switch is electrically connected with the power input end of the line side isolating switch control module, and the power output end of the line side isolating switch control module is electrically connected with the fourth power line.
Optionally, the electrical blocking circuit of the disconnecting switch further comprises:
the first emergency stop switch is connected between the power output end of the first bus-side isolating switch control module and the second power line in series;
a second emergency stop switch connected in series between the power output of the second bus-side disconnector control module and the third power line;
a third emergency stop switch connected in series between the power output of the line side isolator control module and the fourth power line.
Optionally, the electrical blocking circuit of the disconnecting switch further comprises:
a second auxiliary contact of the second bus-side isolating switch, wherein a first end of the second auxiliary contact of the second bus-side isolating switch is electrically connected with the small locking bus, and a second end of the second auxiliary contact of the second bus-side isolating switch is electrically connected with a second power input end of the first bus-side isolating switch control module;
and a second auxiliary contact of the first bus side isolating switch, wherein a first end of the second auxiliary contact of the first bus side isolating switch is electrically connected with the small locking bus, and a second end of the second auxiliary contact of the first bus side isolating switch is electrically connected with a second power supply input end of the second bus side isolating switch control module.
Optionally, the three-phase auxiliary contact of the circuit breaker, the auxiliary contact of the grounding switch on the bus side of the circuit breaker, the auxiliary contact of the grounding switch on the current transformer side of the circuit breaker, the first auxiliary contact of the second bus side disconnecting switch, the first auxiliary contact of the first bus side disconnecting switch, and the auxiliary contact of the line grounding switch are all normally closed contacts;
and the second auxiliary contact of the second bus side isolating switch and the second auxiliary contact of the first bus side isolating switch are normally open contacts.
Optionally, the first power line is an input end of an ac power supply, the second power line is a first ground line, the third power line is a second ground line, and the fourth power line is a third ground line.
Optionally, the first grounded electrical latching circuit comprises:
the circuit breaker bus side grounding switch control module and the circuit breaker current transformer side grounding switch control module are respectively used for controlling the circuit breaker bus side grounding switch and the circuit breaker current transformer side grounding switch to carry out on-off control or off-off control when a power supply is connected;
an air switch, a three-phase auxiliary contact of the circuit breaker, a first auxiliary contact of the first bus-side disconnector, a first auxiliary contact of the second bus-side disconnector and an auxiliary contact of the line-side disconnector;
the first end of the air switch is electrically connected with a first power line, the second end of the air switch is electrically connected with the first end of the three-phase auxiliary contact of the circuit breaker, the second end of the three-phase auxiliary contact of the circuit breaker is electrically connected with the first end of the first auxiliary contact of the first bus-side isolating switch, the second end of the first auxiliary contact of the first bus-side isolating switch is electrically connected with the first end of the first auxiliary contact of the second bus-side isolating switch, and the second end of the first auxiliary contact of the second bus-side isolating switch is electrically connected with the first end of the auxiliary contact of the line-side isolating switch; the second end of the auxiliary contact of the line side disconnecting switch is electrically connected with the power input end of the grounding switch control module at the bus side of the circuit breaker and is electrically connected with the power input end of the grounding switch control module at the current transformer side of the circuit breaker; and the power output end of the circuit breaker bus side grounding switch control module and the power output end of the circuit breaker current transformer side grounding switch control module are electrically connected with a fourth power line.
Optionally, the first grounded electrical latching circuit further comprises:
a fourth emergency stop switch connected in series between the power output of the circuit breaker bus side earthing switch control module and the fourth power line;
a fifth emergency stop switch connected in series between the power output of the circuit breaker current transformer side grounding switch control module and the fourth power line.
Optionally, the second grounded electrical latching circuit comprises:
the circuit grounding switch control module is used for controlling the circuit grounding switch to be switched on or switched off when a power supply is switched in;
the circuit detection module is used for detecting whether the circuit is electrified or not;
air switch with line side isolator's auxiliary contact, air switch's first end is connected with first power cord electricity, air switch's second end with line detection module's first end electricity is connected, line detection module's second end with line side isolator's first end electricity is connected, line side isolator's second end with line ground switch control module's power input end electricity is connected, line ground switch control module's power output end and fourth power cord electricity are connected.
Optionally, the second grounded electrical latching circuit further comprises:
a sixth emergency stop switch connected in series between the power output of the line grounding switch control module and the fourth power line.
According to the embodiment of the invention, the electric locking loop comprises the isolating switch electric locking loop, the first grounding electric locking loop and the second grounding electric locking loop, the on and off of each isolating switch and each grounding switch are respectively controlled, specifically, the set switch can be controlled to be on or off only when the corresponding switch is controlled to be in the on state or the off state through circuit logic, so that the misoperation of pulling on the isolating switch with a load, switching on the isolating switch with the grounding switch and the like in the operation process is avoided, and the reliability of power supply is improved.
Drawings
Fig. 1 is a circuit diagram of an outgoing line interval according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an electrical locking loop of an isolating switch according to a second embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a first grounded electrical latching circuit according to a third embodiment of the present invention;
fig. 4 is a circuit diagram of a second grounded electrical latching circuit according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a circuit diagram of an outgoing line interval according to an embodiment of the present invention. The electric locking loop provided by the embodiment of the invention is suitable for controlling the outgoing line interval. The outlet interval comprises a first bus side isolating switch 1G, a second bus side isolating switch 2G, a line side isolating switch 4G, a circuit breaker DL and a current transformer CT, wherein the first bus side isolating switch 1G and the second bus side isolating switch 2G are used for electrically connecting a first bus 1M (5M) and a second bus 2M (6M) with the circuit breaker DL respectively. The breaker DL, the current transformer CT and the line side disconnecting switch 4G are connected in series. The outlet interval further comprises a breaker bus side grounding switch 02G, a breaker current transformer side grounding switch 04G1 and a line grounding switch 04G2, which are respectively used for bus side grounding of the breaker DL, current transformer CT side grounding of the breaker DL and line grounding.
The voltage levels of the first bus 1M (5M), the second bus 2M (6M) and the line are the same, and for example, the first bus 1M (5M) and the second bus 2M (6M) are both 220kV, and the line is a 220kV line. A first end of the first bus-side disconnector 1G is electrically connected to a first bus 1M (5M), and a second end of the first bus-side disconnector 1G is electrically connected to a first end of the breaker DL; a first end of the second bus-side disconnecting switch 2G is electrically connected to the second bus 2M (6M), a second end of the second bus-side disconnecting switch 2G is electrically connected to a first end of the breaker DL, a first end of the breaker bus-side grounding switch 02G is electrically connected to a first end of the breaker DL, and a second end of the breaker bus-side grounding switch 02G is grounded. The second end of the breaker DL is electrically connected to the first end of the current transformer CT, the second end of the current transformer CT is electrically connected to the first end of the line side disconnector 4G, and the second end of the line side disconnector 4G is connected to the line. The circuit breaker current transformer side grounding switch 04G1 is electrically connected to the second terminal of the current transformer CT, the first terminal of the line grounding switch 04G2 is electrically connected to the second terminal of the line side disconnecting switch 4G, and the second terminal of the line grounding switch 04G2 is grounded.
Under the condition of power failure and maintenance of equipment, misoperation such as pulling on the isolating switch with load, switching on the isolating switch with the grounding switch and the like can occur in the operation process. The embodiment of the invention provides an electric locking loop aiming at the outgoing line interval. The electrical latching circuit includes: the isolating switch electric locking loop, the first grounding electric locking loop and the second grounding electric locking loop.
The isolating switch electrical locking loop comprises a first bus side isolating switch control branch, a second bus side isolating switch control branch and a circuit isolating switch control branch; the first bus side disconnecting switch control branch is used for controlling the first bus side disconnecting switch 1G to carry out on-off control or off-off control when the breaker DL is at an opening position, and the breaker bus side grounding switch 02G, the breaker current transformer side grounding switch 04G1 and the second bus side disconnecting switch 2G are at an opening position; the second bus side disconnecting switch control branch is used for controlling the second bus side disconnecting switch 2G to carry out on-off control or off-off control when the breaker DL is at an opening position, and the breaker bus side grounding switch 02G, the breaker current transformer side grounding switch 04G1 and the first bus side disconnecting switch 1G are at an opening position; the line disconnecting switch control branch is used for controlling the line side disconnecting switch 4G to be switched on or switched off when the breaker DL is at the switching-off position, and the breaker bus side grounding switch 02G, the breaker current transformer side grounding switch 04G1 and the line side disconnecting switch 4G are at the switching-off position. Namely, the electric locking loop of the isolating switch can realize the control of the first bus-side isolating switch 1G, the second bus-side isolating switch 2G and the line-side isolating switch 4G, so that each isolating switch can be closed and opened only under the set condition.
The first ground electric locking circuit is used for controlling the closing control or opening control of the breaker bus-side ground switch 02G and the breaker current transformer-side ground switch 04G1 when the breaker DL is in the open position and the first bus-side disconnector 1G, the second bus-side disconnector 2G and the line-side disconnector 4G are in the open position. That is, the first ground electric lock circuit can control the breaker bus-side ground switch 02G and the breaker current transformer-side ground switch 04G1 so that both ground switches are turned on and off only under set conditions.
The second ground electrical latching circuit is used for controlling the line ground switch 04G2 to be closed or opened when the line side disconnecting switch 4G is in the opened position when the line is detected to be dead. That is, the second ground electric locking circuit can control the line-ground switch 04G2 so that it can be closed and opened only under a set condition.
According to the embodiment of the invention, the electric locking loop comprises the isolating switch electric locking loop, the first grounding electric locking loop and the second grounding electric locking loop, the on and off of each isolating switch and each grounding switch are respectively controlled, specifically, the set switch can be controlled to be on or off only when the corresponding switch is controlled to be in the on state or the off state through circuit logic, so that the misoperation of pulling on the isolating switch with a load, switching on the isolating switch with the grounding switch and the like in the operation process is avoided, and the reliability of power supply is improved.
Example two
On the basis of the above embodiments, the embodiments describe specific arrangement modes of the electrical locking circuit of the disconnecting switch. Fig. 2 is a schematic circuit diagram of an electrical locking loop of an isolating switch according to a second embodiment of the present invention. Referring to fig. 2, the electrical blocking circuit of the disconnector comprises: the first bus side isolating switch control module, the second bus side isolating switch control module and the line side isolating switch control module are respectively used for controlling the first bus side isolating switch 1G, the second bus side isolating switch 2G and the line side isolating switch 4G to be closed or opened when a power supply is connected.
The isolator electric locking return circuit still includes: the air switch 5MCB, the three-phase auxiliary contact of the breaker DL (including the a-phase auxiliary contact DLa, the b-phase auxiliary contact DLb, and the c-phase auxiliary contact DLc), the auxiliary contact 02G 'of the breaker bus-side grounding switch 02G', the auxiliary contact 04G1 'of the breaker current transformer-side grounding switch 04G1, the first auxiliary contact 2G-1 of the second bus-side disconnecting switch 2G, the first auxiliary contact 1G-1 of the first bus-side disconnecting switch 1G, and the auxiliary contact 04G 2' of the line grounding switch 04G 2.
Wherein a first end of the air switch 5MCB is electrically connected to the first power line A, a second end of the air switch 5MCB is electrically connected to a first end of a three-phase auxiliary contact of the breaker DL, a second end of the three-phase auxiliary contact of the breaker DL is electrically connected to a first end of an auxiliary contact 02G 'of the breaker bus-side grounding switch 02G, a second end of the auxiliary contact 02G' of the breaker bus-side grounding switch 02G is electrically connected to a first end of an auxiliary contact 04G1 'of the breaker current transformer-side grounding switch 04G1, a second end of the auxiliary contact 04G 1' of the breaker current transformer-side grounding switch 04G1 is electrically connected to a first end of a first auxiliary contact 2G-1 of the second bus-side disconnecting switch 2G, a second end of a first auxiliary contact 2G-1 of the second bus-side disconnecting switch 2G is electrically connected to a first power input terminal of the first bus-side disconnecting switch control module, the power output end of the first bus side isolating switch control module is electrically connected with the second power line-1N. That is, the air switch 5MCB, the three-phase auxiliary contact of the breaker DL, the auxiliary contact 02G 'of the breaker bus-side grounding switch 02G, the auxiliary contact 04G 1' of the breaker current transformer-side grounding switch 04G1, and the first auxiliary contact 2G-1 of the second bus-side disconnecting switch 2G constitute a first bus-side disconnecting switch control branch.
Illustratively, the working principle of the first bus-side disconnecting switch control branch is that when the air switch 5MCB is closed, the breaker DL is in the opening position, and the three-phase auxiliary contact of the breaker DL is closed; the breaker bus-side grounding switch 02G is in the open position, and the first auxiliary contact 02G-1 of the breaker bus-side grounding switch 02G is closed; the circuit breaker current transformer side grounding switch 04G1 is in the open position, the auxiliary contact 04G 1' of the circuit breaker current transformer side grounding switch 04G1 is closed; when the second bus side disconnecting switch 2G is in the open position, a first auxiliary contact 2G-1 of the second bus side disconnecting switch 2G is closed; therefore, the control branch of the first bus side isolating switch 1G is conducted, the power is input into the first bus side isolating switch control module, and the first bus side isolating switch 1G can be closed or opened for control at the moment.
With continued reference to fig. 2, a first end of the first auxiliary contact 1G-1 of the first bus-side disconnector 1G is electrically connected to a second end of the auxiliary contact 04G 1' of the circuit breaker current transformer-side grounding switch 04G1, a second end of the first auxiliary contact 1G-1 of the first bus-side disconnector 1G is electrically connected to a first power input of the second bus-side disconnector control module, and a power output of the second bus-side disconnector control module is electrically connected to the third power line-2N. That is, the air switch 5MCB, the three-phase auxiliary contact of the breaker DL, the auxiliary contact 02G of the breaker bus-side grounding switch 02G, the auxiliary contact 04G 1' of the breaker current transformer-side grounding switch 04G1, and the first auxiliary contact 1G-1 of the first bus-side disconnecting switch 1G constitute a second bus-side disconnecting switch 2G control branch.
Illustratively, the working principle of the control branch of the second bus-side disconnecting switch is that when the air switch 5MCB is closed, the breaker DL is in the opening position, and the three-phase auxiliary contact of the breaker DL is closed; the breaker bus-side grounding switch 02G is in the open position, and the auxiliary contact 02G' of the breaker bus-side grounding switch 02G is closed; the circuit breaker current transformer side grounding switch 04G1 is in the open position, the auxiliary contact 04G1 of the circuit breaker current transformer side grounding switch 04G1 is closed; when the first bus side disconnecting switch 1G is in the open position, a first auxiliary contact 1G-1 of the first bus side disconnecting switch 1G is closed; therefore, the second bus side isolating switch control branch circuit is conducted, the power supply is input into the second bus side isolating switch control module, and the second bus side isolating switch 2G can be switched on or switched off to be controlled.
With continued reference to fig. 2, a first end of the auxiliary contact 04G2 ' of the line grounding switch 04G2 is electrically connected to a second end of the auxiliary contact 04G1 ' of the breaker current transformer side grounding switch 04G1, a second end of the auxiliary contact 04G2 ' of the line grounding switch 04G2 is electrically connected to the power input terminal of the line side disconnecting switch control module, and the power output terminal of the line side disconnecting switch control module is electrically connected to the fourth power lines — N. That is, the air switch 5MCB, the three-phase auxiliary contact of the breaker DL, the auxiliary contact 02G of the breaker bus-side grounding switch 02G, the auxiliary contact 04G1 'of the breaker current transformer-side grounding switch 04G1, and the auxiliary contact 04G 2' of the line grounding switch 04G2 constitute a second bus-side disconnecting switch control branch.
Illustratively, the working principle of the line side disconnecting switch control branch is that when the air switch 5MCB is closed, the breaker DL is in the opening position, and the three-phase auxiliary contact of the breaker DL is closed; the breaker bus-side grounding switch 02G is in the open position, and the auxiliary contact 02G' of the breaker bus-side grounding switch 02G is closed; the circuit breaker current transformer side grounding switch 04G1 is in the open position, the auxiliary contact 04G 1' of the circuit breaker current transformer side grounding switch 04G1 is closed; when the line grounding switch 04G2 is in the open position, the auxiliary contact 04G 2' of the line grounding switch 04G2 is closed; therefore, the line side isolating switch 4G controls the branch circuit to be conducted, and the power supply is input into the line side isolating switch control module, so that the line side isolating switch 4G can be controlled to be closed or opened.
In the above-described configuration, the first bus-side disconnecting switch control branch, the second bus-side disconnecting switch control branch, and the line-side disconnecting switch control branch may share the air switch 5MCB, the three-phase auxiliary contact of the breaker DL, the auxiliary contact 02G 'of the breaker bus-side grounding switch 02G, and the auxiliary contact 04G 1' of the breaker current transformer-side grounding switch 04G1, so as to simplify the circuit configuration.
With continued reference to fig. 2, based on the above technical solutions, optionally, the electrical blocking circuit of the disconnecting switch further includes: and the first emergency stop switch 1TA is connected between the power output end of the first bus side isolating switch control module and the second power line-1N in series. The first emergency stop switch 1TA may be a push button switch, which is advantageous for emergency stop control. For example, when the first bus-side disconnecting switch control branch is turned on, if an abnormality or other special conditions occur in the control process, the first emergency stop switch 1TA may be pressed to open the loop, and the control is stopped.
With continued reference to fig. 2, based on the above technical solutions, optionally, the electrical blocking circuit of the disconnecting switch further includes: and the second emergency stop switch 2TA is connected between the power output end of the second bus side isolating switch control module and a third power line 2N in series. Wherein the second emergency stop switch 2TA may be a push button switch, facilitating emergency stop control. For example, when the control branch of the second bus-side disconnecting switch 2G is turned on, if an abnormality or other special condition occurs during the control process, the second emergency stop switch 2TA may be pressed to open the loop, and the control is stopped.
With continued reference to fig. 2, based on the above technical solutions, optionally, the electrical blocking circuit of the disconnecting switch further includes: and the third emergency stop switch 4TA is connected in series between the power output end of the line side disconnecting switch control module and the fourth power line-N. The third emergency stop switch 4TA may be a push button switch, which is advantageous for emergency stop control. For example, when the line side disconnecting switch 4G controls the branch to be turned on, if an abnormality or other special condition occurs during the control process, the third emergency stop switch 4TA may be pressed to disconnect the loop and stop the control.
With continued reference to fig. 2, based on the above technical solutions, optionally, the electrical blocking circuit of the disconnecting switch further includes: a second auxiliary contact 2G-2 of the second bus-side disconnector 2G and a second auxiliary contact 1G-2 of the first bus-side disconnector 1G. The first end of the second auxiliary contact 2G-2 of the second bus side disconnecting switch 2G is electrically connected with the small locking bus-GBM, and the second end of the second auxiliary contact 2G-2 of the second bus side disconnecting switch 2G is electrically connected with the second power supply input end of the first bus side disconnecting switch control module. The first end of the second auxiliary contact 1G-2 of the first bus side disconnecting switch 1G is electrically connected with the small locking bus-GBM, and the second end of the second auxiliary contact 1G-2 of the first bus side disconnecting switch 1G is electrically connected with the second power supply input end of the second bus side disconnecting switch control module. The equipotential can be realized like this and bus side isolator opens or closes, realizes that the circuit breaker changes to hang to the second generating line by hanging first generating line operation, or changes to hang to first generating line by hanging the operation of second generating line and has further avoided the appearance of maloperation, has further promoted the power supply reliability.
With continued reference to fig. 2, in each of the above solutions, the three-phase auxiliary contact of the breaker DL, the auxiliary contact 02G of the breaker bus-side grounding switch 02G ', the auxiliary contact 04G1 ' of the breaker current transformer-side grounding switch 04G1, the first auxiliary contact 2G-1 of the second bus-side disconnecting switch 2G, the first auxiliary contact 1G-1 of the first bus-side disconnecting switch 1G, and the auxiliary contact 04G2 ' of the line grounding switch 04G2 are all normally closed contacts. The second auxiliary contact 2G-2 of the second bus side disconnector 2G and the second auxiliary contact 1G-2 of the first bus side disconnector 1G are both normally open contacts.
With reference to fig. 2, in each of the above technical solutions, the first power line-a is an a-phase line, the second power line-1N is a first ground line, the third power line-2N is a second ground line, and the fourth power line-N is a third ground line.
It should be noted that fig. 2 exemplarily shows that the first power line is an a-phase line, but the present invention is not limited thereto, and in other embodiments, the first power line may also be provided as another ac power input terminal such as a B-phase line or a C-phase line, and may be set as needed in practical applications.
EXAMPLE III
In addition to the above embodiments, the third embodiment describes a specific arrangement of the first grounded electrical closed circuit. Fig. 3 is a circuit schematic diagram of a first grounded electrical latching circuit according to a third embodiment of the present invention. Referring to fig. 3, the first grounded electrical latching circuit includes: the circuit breaker bus side grounding switch control module and the circuit breaker current transformer side grounding switch control module are respectively used for controlling the circuit breaker bus side grounding switch 02G and the circuit breaker current transformer side grounding switch 04G1 to be switched on or switched off when a power supply is switched on.
The first grounded electrical latching circuit further comprises: the air switch 5MCB, the three-phase auxiliary contacts of the circuit breaker DL, the first auxiliary contact 1G-1 of the first bus-side disconnector 1G, the first auxiliary contact 2G-1 of the second bus-side disconnector 2G and the auxiliary contact 4G' of the line-side disconnector 4G.
Wherein, the first end of the air switch 5MCB is electrically connected with the first power line-A, the second end of the air switch 5MCB is electrically connected with the first end of the three-phase auxiliary contact of the breaker DL, the second end of the three-phase auxiliary contact of the breaker DL is electrically connected with the first end of the first auxiliary contact 1G-1 of the first bus side disconnecting switch 1G, the second end of the first auxiliary contact 1G-1 of the first bus side disconnecting switch 1G is electrically connected with the first end of the first auxiliary contact 2G-1 of the second bus side disconnecting switch 2G, the second end of the first auxiliary contact 2G-1 of the second bus side disconnecting switch 2G is electrically connected with the first end of the auxiliary contact 4G' of the line side disconnecting switch 4G; the second end of the auxiliary contact 4G' of the line side disconnecting switch 4G is electrically connected with the power input end of the grounding switch control module at the bus side of the circuit breaker and is electrically connected with the power input end of the grounding switch control module at the side of the current transformer of the circuit breaker; and the power output end of the grounding switch control module at the bus side of the circuit breaker and the power output end of the grounding switch control module at the current transformer side of the circuit breaker are electrically connected with the fourth power lines-N.
Illustratively, the first grounded electrical latching circuit operates on the principle that when the air switch 5MCB is closed, the breaker DL is in the open position and the three-phase auxiliary contacts of the breaker DL are closed; when the first bus side disconnecting switch 1G is in the open position, a first auxiliary contact 1G-1 of the first bus side disconnecting switch 1G is closed; when the second bus side disconnecting switch 2G is in the open position, a first auxiliary contact 2G-1 of the second bus side disconnecting switch 2G is closed; with the line disconnector in the pulled-open position, the auxiliary contact 4G' of the line side disconnector 4G is closed. Therefore, the first grounding electric locking loop is conducted, the power is input into the circuit breaker bus side grounding switch control module and the circuit breaker current transformer side grounding switch control module, and the circuit breaker bus side grounding switch and the circuit breaker current transformer side grounding switch can be controlled to be closed or opened.
With continued reference to fig. 3, based on the above solutions, optionally, the first grounded electrical latching circuit further includes: a fourth emergency stop switch 02TA and a fifth emergency stop switch 041 TA. The fourth emergency stop switch 02TA is connected in series between the power output end of the circuit breaker bus side grounding switch control module and the second power line-1N; the fifth emergency stop switch 041TA is connected in series between the power output terminal of the grounding switch control module on the side of the current transformer of the circuit breaker and the fourth power line-N.
The fourth emergency stop switch 02TA and the fifth emergency stop switch 041TA may be push-button switches, which is advantageous for emergency stop control. For example, when the first grounded electrical latching circuit is turned on, if an abnormality or other special condition occurs during the control process, the fourth emergency stop switch 02TA or the fifth emergency stop switch 041TA may be pressed to open the circuit, and the control of the corresponding switch may be stopped.
In the above-described embodiment, the disconnecting switch electrical latching circuit and the first grounding electrical latching circuit may share the air switch 5MCB, the three-phase auxiliary contact of the breaker DL, the first power lines-a, and the fourth power lines-N, so as to simplify the circuit configuration.
Example four
In addition to the above embodiments, the fourth embodiment describes a specific arrangement of the second grounded electrical closed circuit. Fig. 4 is a circuit diagram of a second grounded electrical latching circuit according to a fourth embodiment of the present invention. Referring to fig. 4, the second grounded electrical latching circuit includes: the auxiliary contact 4G' of the line earthing switch control module, the line detection module, the air switch 5MCB and the line side disconnecting switch 4G. The line grounding switch control module is used for controlling the line grounding switch 04G2 to be switched on or switched off when the power supply is switched on. The line detection module is used for detecting whether the line is electrified. The first end of the air switch 5MCB is electrically connected with the first power line A, the second end of the air switch 5MCB is electrically connected with the first end of the line detection module, the second end of the line detection module is electrically connected with the first end of the auxiliary contact 4G 'of the line side isolating switch 4G, the second end of the auxiliary contact 4G' of the line side isolating switch 4G is electrically connected with the power input end of the line grounding switch 04G2 control module, and the power output end of the line grounding switch 04G2 control module is electrically connected with the fourth power line N.
Illustratively, the working principle of the second grounding electric locking loop is that when the air switch 5MCB is closed, the line detection module detects that the line is not electrified, and the line detection module is conducted; when the line side disconnecting switch 4G is in the open position, the auxiliary contact 4G' of the line side disconnecting switch 4G is closed; the second grounding electric locking loop is conducted, and the power supply is input into the line grounding switch control module, so that the line grounding switch 04G2 can be controlled to be closed or opened.
With continued reference to fig. 4, based on the above technical solutions, optionally, the second grounded electrical latching circuit further includes: and a sixth emergency stop switch 042TA, the sixth emergency stop switch 042TA being connected in series between the power output terminal of the line grounding switch 04G2 control module and the fourth power line-N. The sixth emergency stop switch 042TA may be a push button switch, which is advantageous for emergency stop control. For example, when the second grounded electrical locking circuit is turned on, if an abnormality or other special condition occurs during the control process, the sixth emergency stop switch 042TA may be pressed to open the circuit, and the control of the corresponding switch may be stopped.
In the above technical solution, the second ground electric latching circuit, the disconnecting switch electric latching circuit, and the first ground electric latching circuit may share the air switch 5MCB, the first power lines-a, and the fourth power lines-N, so as to simplify the circuit configuration.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. An electric locking loop of an outgoing line interval is characterized in that the outgoing line interval comprises a first bus side isolating switch, a second bus side isolating switch, a line side isolating switch, a circuit breaker and a current transformer, wherein the first bus side isolating switch and the second bus side isolating switch are used for electrically connecting a first bus and a second bus with the circuit breaker respectively; the circuit breaker, the current transformer and the line side disconnecting switch are connected in series; the outgoing line interval also comprises a circuit breaker bus side grounding switch, a circuit breaker current transformer side grounding switch and a line grounding switch which are respectively used for circuit breaker bus side grounding, circuit breaker current transformer side grounding and line grounding;
the electrical latching circuit includes:
the isolating switch electrical locking loop comprises a first bus side isolating switch control branch, a second bus side isolating switch control branch and a line side isolating switch control branch; the first bus side disconnecting switch control branch is used for controlling the first bus side disconnecting switch to carry out on-off control or off-off control when the circuit breaker is at an opening position, and the circuit breaker bus side grounding switch, the circuit breaker current transformer side grounding switch and the second bus side disconnecting switch are at an opening position; the second bus side disconnecting switch control branch is used for controlling the second bus side disconnecting switch to carry out on-off control or off-off control when the circuit breaker is at an opening position, and the circuit breaker bus side grounding switch, the circuit breaker current transformer side grounding switch and the first bus side disconnecting switch are at an opening position; the line side disconnecting switch control branch is used for controlling the line side disconnecting switch to carry out on-off control or off-off control when the circuit breaker is in an opening position, and the circuit breaker bus side grounding switch, the circuit breaker current transformer side grounding switch and the line grounding switch are in an off-position;
the first grounding electric locking loop is used for controlling the circuit breaker bus-side grounding switch and the circuit breaker current transformer-side grounding switch to be switched on or switched off when the circuit breaker is in the opening position and the first bus-side isolating switch, the second bus-side isolating switch and the line-side isolating switch are in the opening position;
and the second grounding electric locking loop is used for controlling the line grounding switch to carry out closing control or opening control when the line side isolating switch is in an opening position when no electricity is detected in the line.
2. The electrical latching circuit for an outlet interval of claim 1, wherein said isolator electrical latching circuit comprises:
the first bus side isolating switch control module, the second bus side isolating switch control module and the line side isolating switch control module are respectively used for controlling the first bus side isolating switch, the second bus side isolating switch and the line side isolating switch to carry out on-off control or off-off control when a power supply is connected;
the circuit breaker comprises an air switch, a three-phase auxiliary contact of the circuit breaker, an auxiliary contact of a grounding switch on a bus side of the circuit breaker, an auxiliary contact of a grounding switch on a current transformer side of the circuit breaker, a first auxiliary contact of a disconnecting switch on a second bus side, a first auxiliary contact of a disconnecting switch on the first bus side and an auxiliary contact of a grounding switch of a circuit;
wherein a first end of the air switch is electrically connected with a first power line, a second end of the air switch is electrically connected with a first end of a three-phase auxiliary contact of the circuit breaker, the second end of the three-phase auxiliary contact of the circuit breaker is electrically connected with the first end of the auxiliary contact of the grounding switch on the bus side of the circuit breaker, a second end of the auxiliary contact of the circuit breaker busbar-side grounding switch is electrically connected with a first end of the auxiliary contact of the circuit breaker current transformer-side grounding switch, a second end of the auxiliary contact of the circuit breaker current transformer side grounding switch is electrically connected with a first end of the first auxiliary contact of the second bus side disconnecting switch, the second end of the first auxiliary contact of the second bus-side isolating switch is electrically connected with the first power input end of the first bus-side isolating switch control module, the power output end of the first bus side isolating switch control module is electrically connected with a second power line;
a first end of a first auxiliary contact of the first bus side disconnecting switch is electrically connected with a second end of an auxiliary contact of the grounding switch on the side of the circuit breaker current transformer, a second end of the first auxiliary contact of the first bus side disconnecting switch is electrically connected with a first power supply input end of the second bus side disconnecting switch control module, and a power supply output end of the second bus side disconnecting switch control module is electrically connected with a third power supply line;
the first end of the auxiliary contact of the line grounding switch is electrically connected with the second end of the auxiliary contact of the circuit breaker current transformer side grounding switch, the second end of the auxiliary contact of the line grounding switch is electrically connected with the power input end of the line side isolating switch control module, and the power output end of the line side isolating switch control module is electrically connected with the fourth power line.
3. The outlet spaced electrical latch circuit of claim 2 further including:
the first emergency stop switch is connected between the power output end of the first bus-side isolating switch control module and the second power line in series;
a second emergency stop switch connected in series between the power output of the second bus-side disconnector control module and the third power line;
a third emergency stop switch connected in series between the power output of the line side isolator control module and the fourth power line.
4. The outlet spaced electrical latch circuit of claim 2 further including:
a second auxiliary contact of the second bus-side isolating switch, wherein a first end of the second auxiliary contact of the second bus-side isolating switch is electrically connected with the small locking bus, and a second end of the second auxiliary contact of the second bus-side isolating switch is electrically connected with a second power input end of the first bus-side isolating switch control module;
and a second auxiliary contact of the first bus side isolating switch, wherein a first end of the second auxiliary contact of the first bus side isolating switch is electrically connected with the small locking bus, and a second end of the second auxiliary contact of the first bus side isolating switch is electrically connected with a second power supply input end of the second bus side isolating switch control module.
5. The electrical latching circuit for an outlet cubicle of claim 4 wherein the three phase auxiliary contacts of said circuit breaker, the auxiliary contacts of said circuit breaker bus side grounding switch, the auxiliary contacts of said circuit breaker current transformer side grounding switch, the first auxiliary contacts of said second bus side disconnector, the first auxiliary contacts of said first bus side disconnector and the auxiliary contacts of said line grounding switch are all normally closed contacts;
and the second auxiliary contact of the second bus side isolating switch and the second auxiliary contact of the first bus side isolating switch are normally open contacts.
6. The spaced-out electrical latch circuit of claim 2, wherein the first power line is an ac power input, the second power line is a first ground line, the third power line is a second ground line, and the fourth power line is a third ground line.
7. The spaced-out electrical latch circuit of claim 1 wherein the first grounded electrical latch circuit comprises:
the circuit breaker bus side grounding switch control module and the circuit breaker current transformer side grounding switch control module are respectively used for controlling the circuit breaker bus side grounding switch and the circuit breaker current transformer side grounding switch to carry out on-off control or off-off control when a power supply is connected;
an air switch, a three-phase auxiliary contact of the circuit breaker, a first auxiliary contact of the first bus-side disconnector, a first auxiliary contact of the second bus-side disconnector and an auxiliary contact of the line-side disconnector;
the first end of the air switch is electrically connected with a first power line, the second end of the air switch is electrically connected with the first end of the three-phase auxiliary contact of the circuit breaker, the second end of the three-phase auxiliary contact of the circuit breaker is electrically connected with the first end of the first auxiliary contact of the first bus-side isolating switch, the second end of the first auxiliary contact of the first bus-side isolating switch is electrically connected with the first end of the first auxiliary contact of the second bus-side isolating switch, and the second end of the first auxiliary contact of the second bus-side isolating switch is electrically connected with the first end of the auxiliary contact of the line-side isolating switch; the second end of the auxiliary contact of the line side disconnecting switch is electrically connected with the power input end of the grounding switch control module at the bus side of the circuit breaker and is electrically connected with the power input end of the grounding switch control module at the current transformer side of the circuit breaker; and the power output end of the circuit breaker bus side grounding switch control module and the power output end of the circuit breaker current transformer side grounding switch control module are electrically connected with a fourth power line.
8. The electrical latch circuit for an outlet interval of claim 7 wherein said first ground electrical latch circuit further comprises:
a fourth emergency stop switch connected in series between the power output of the circuit breaker bus side earthing switch control module and the fourth power line;
a fifth emergency stop switch connected in series between the power output of the circuit breaker current transformer side grounding switch control module and the fourth power line.
9. The spaced-out electrical latch circuit of claim 1 wherein the second grounded electrical latch circuit comprises:
the circuit grounding switch control module is used for controlling the circuit grounding switch to be switched on or switched off when a power supply is switched in;
the circuit detection module is used for detecting whether the circuit is electrified or not;
air switch with line side isolator's auxiliary contact, air switch's first end is connected with first power cord electricity, air switch's second end with line detection module's first end electricity is connected, line detection module's second end with line side isolator's first end electricity is connected, line side isolator's second end with line ground switch control module's power input end electricity is connected, line ground switch control module's power output end and fourth power cord electricity are connected.
10. The outlet spaced electrical latch circuit of claim 9 wherein said second ground electrical latch circuit further comprises:
a sixth emergency stop switch connected in series between the power output of the line grounding switch control module and the fourth power line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110378290.3A CN113113252A (en) | 2021-04-08 | 2021-04-08 | Electric locking loop with outlet intervals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110378290.3A CN113113252A (en) | 2021-04-08 | 2021-04-08 | Electric locking loop with outlet intervals |
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| Publication Number | Publication Date |
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| CN113113252A true CN113113252A (en) | 2021-07-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110378290.3A Pending CN113113252A (en) | 2021-04-08 | 2021-04-08 | Electric locking loop with outlet intervals |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113809826A (en) * | 2021-09-10 | 2021-12-17 | 广东电网有限责任公司 | Transformer substation switching control system and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206134549U (en) * | 2016-10-12 | 2017-04-26 | 国网新疆电力公司培训中心 | Device of keeping apart super high voltage circuit breaker |
| CN107919243A (en) * | 2017-06-15 | 2018-04-17 | 国网浙江省电力公司湖州供电公司 | A kind of improved structure and control method in disconnecting switch electric blocking circuit |
| CN110349782A (en) * | 2019-08-06 | 2019-10-18 | 广东电网有限责任公司 | A kind of electrical five-defence block circuit |
| CN112509850A (en) * | 2020-11-19 | 2021-03-16 | 广东电网有限责任公司 | Ground knife electric locking device and circuit interval with same |
-
2021
- 2021-04-08 CN CN202110378290.3A patent/CN113113252A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206134549U (en) * | 2016-10-12 | 2017-04-26 | 国网新疆电力公司培训中心 | Device of keeping apart super high voltage circuit breaker |
| CN107919243A (en) * | 2017-06-15 | 2018-04-17 | 国网浙江省电力公司湖州供电公司 | A kind of improved structure and control method in disconnecting switch electric blocking circuit |
| CN110349782A (en) * | 2019-08-06 | 2019-10-18 | 广东电网有限责任公司 | A kind of electrical five-defence block circuit |
| CN112509850A (en) * | 2020-11-19 | 2021-03-16 | 广东电网有限责任公司 | Ground knife electric locking device and circuit interval with same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113809826A (en) * | 2021-09-10 | 2021-12-17 | 广东电网有限责任公司 | Transformer substation switching control system and method |
| CN113809826B (en) * | 2021-09-10 | 2024-05-03 | 广东电网有限责任公司 | Switching control system and method for transformer substation |
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Application publication date: 20210713 |