CN112491033A - Outdoor switch box automation equipment control circuit - Google Patents
Outdoor switch box automation equipment control circuit Download PDFInfo
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- CN112491033A CN112491033A CN202011078660.3A CN202011078660A CN112491033A CN 112491033 A CN112491033 A CN 112491033A CN 202011078660 A CN202011078660 A CN 202011078660A CN 112491033 A CN112491033 A CN 112491033A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
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Abstract
The invention discloses an outdoor switch box automation equipment control circuit, which comprises a loop-in controller T1, a loop-out controller T2, a switch travel relay R1, a switch travel relay R2, a voltage transformer PT1 and a voltage transformer PT 2; the primary side of a voltage transformer PT1 is connected with a 10kV inlet three-phase cable AB phase, and the secondary side of a voltage transformer PT1 is connected with the input ends of a loop-in controller T1 and a loop-out controller T2; the primary side of a voltage transformer PT2 is connected with a 10kV loop-out three-phase cable BC phase, the secondary side of a voltage transformer PT2 is respectively connected with the input ends of a loop-out controller T2 and a loop-in controller T1, the output end of a switch travel relay R1 is connected with the input end of a loop-out controller T2, and the output end of a switch travel relay R2 is connected with a loop-in controller T1. The circuit realizes the logical judgment of voltage time type action without a bus voltage transformer, and ensures the reliability of equipment.
Description
Technical Field
The invention relates to the technical field of electric power automation, in particular to an outdoor switch box automation equipment control circuit.
Background
Outdoor switch box automation equipment is a switchgear who uses in the urban distribution network, for realizing voltage time type feeder automation logic, through design 3 voltage transformer on the control circuit inside the equipment, as shown in fig. 1, voltage transformer PT1 one side wherein connects in the inlet wire side that encircles into the switch, and voltage transformer PT2 one side is connected in the inlet wire side that encircles out the switch, and voltage transformer PT3 one side is connected in the generating line on outdoor switch box automation equipment. The outdoor switch box automation equipment based on the electrical structure can complete the action logics of single-side power-on delay switching-on and double-side delay switching-off of the ring-in switch and the ring-out switch, and simultaneously realize the logic linkage of the ring-in switch and the ring-out switch, namely, the time-delay switching-on can be carried out when the incoming line side of the ring-in switch has voltage, so that the bus is electrified, and the time-delay switching-on is carried out when the single side of the ring-out switch has voltage.
At present, outdoor switch box automation equipment designed with a bus voltage transformer is large in size, and when the bus voltage transformer fails, a bus on the outdoor switch box automation equipment is easy to have voltage loss risk, so that the running reliability of the equipment is reduced; in addition, when the ring inlet switch and the ring outlet switch of the outdoor switch box automation equipment are powered on simultaneously, the ring closing risk can occur when the ring inlet switch and the ring outlet switch are switched on simultaneously.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides the control circuit of the outdoor switch box automation equipment, which can realize voltage time type action logic judgment without depending on the traditional bus voltage transformer, thereby improving the running reliability of the equipment and reducing the volume of the equipment.
In order to solve the above problems, the present invention proposes an outdoor switch box automation equipment control circuit, which includes a loop-in controller T1, a loop-out controller T2, a switch travel relay R1, a switch travel relay R2, a voltage transformer PT1 and a voltage transformer PT2, wherein:
the primary side of the voltage transformer PT1 is connected with the phase A and the phase B in a 10kV loop-in three-phase cable, the secondary side of the voltage transformer PT1 is connected with the loop-in controller T1, the secondary side of the voltage transformer PT1 is connected with the loop-out controller T2, and the output end of the switch travel relay R1 is connected with the loop-out controller T2;
the primary side of the voltage transformer PT2 is connected with the phase B and the phase C in a 10kV loop-out three-phase cable, the secondary side of the voltage transformer PT2 is connected with the loop-out controller T2, the secondary side of the voltage transformer PT2 is connected with the loop-in controller T1, and the output end of the switch travel relay R2 is connected with the loop-out controller T1.
In an alternative embodiment, the circuit further comprises a loop-in switch K1;
one end of the ring-in switch K1 is connected with the 10kV ring-in three-phase cable, the other end of the ring-in switch K1 is connected with a BUS BUS, and the ring-in switch K1 is linked with the switch travel relay R1.
In an alternative embodiment, the circuit further comprises a loop-out switch K4;
one end of the ring-out switch K4 is connected with the 10kV ring-out three-phase cable, the other end of the ring-out switch K4 is connected with the BUS BUS, and the ring-out switch K4 is linked with the switch travel relay R2.
In an alternative embodiment, the circuit further comprises at least a branch switch K2 and a branch switch K3;
one end of the branch switch K2 is connected with a user side load, and the other end of the branch switch K2 is connected with the BUS BUS; one end of the branch switch K3 is connected with a user side load, and the other end of the branch switch K3 is connected with the BUS BUS.
In the embodiment of the invention, the loop-out controller T2 can complete the judgment of the charged condition on the equipment bus through the collected output signal of the switch travel relay R1 and the output voltage of the voltage transformer PT1, and further realize the voltage time type action logic judgment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art control circuit for an outdoor switchgear automation device, disclosed in an embodiment of the present invention;
fig. 2 is a schematic diagram of an outdoor switch box automation device control circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 2 shows a schematic diagram of an outdoor switch box automation device control circuit in an embodiment of the present invention, the circuit includes a loop-in controller T1, a loop-out controller T2, a trip relay R1, a trip relay R2, a voltage transformer PT1, and a voltage transformer PT 2. The primary side of a voltage transformer PT1 is connected with A phase and B phase in a 10kV loop-in three-phase cable, the secondary side of the voltage transformer PT1 is connected with the loop-in controller T1, the secondary side of the voltage transformer PT1 is connected with the loop-out controller T2, and the output end of the switch travel relay R1 is connected with the loop-out controller T2; the primary side of the voltage transformer PT2 is connected with the phase B and the phase C in a 10kV loop-out three-phase cable, the secondary side of the voltage transformer PT2 is connected with the loop-out controller T2, the secondary side of the voltage transformer PT2 is connected with the loop-in controller T1, and the output end of the switch travel relay R2 is connected with the loop-out controller T1.
Basically, the primary side of the voltage transformer PT1 is connected to a 10kV loop-in three-phase cable, the secondary side of the voltage transformer PT1 is connected to the loop-in controller T1, the secondary side of the voltage transformer PT1 is connected to the loop-out controller T2, and the output terminal of the trip relay R1 is connected to the loop-out controller T2; the primary side of the voltage transformer PT2 is connected with a 10kV loop-out three-phase cable, the secondary side of the voltage transformer PT2 is connected with the loop-out controller T2, the secondary side of the voltage transformer PT2 is connected with the loop-in controller T1, and the output end of the travel relay R2 is connected with the loop-in controller T1. The voltage transformer PT1 only acts on AB phase voltage of the 10kV in-loop three-phase cable, and the voltage transformer PT2 only acts on BC phase voltage of the 10kV out-loop three-phase cable.
Further, the circuit at least comprises a branch switch K2 and a branch switch K3; one end of the branch switch K2 is connected with a user side load, and the other end of the branch switch K2 is connected with the BUS BUS; one end of the branch switch K3 is connected with a user side load, and the other end of the branch switch K3 is connected with the BUS BUS. It should be noted that, in the embodiment of the present invention, the number of the branch switches disposed on the bus side is not limited, and the branch switch K2 and the branch switch K3 serve as a connection channel between the bus and the user side load, and will play a role in protecting the user side load and cutting off the power failure in time.
Further, the circuit further comprises a loop-in switch K1 and a loop-out switch K4; one end of the ring-in switch K1 is connected with the 10kV ring-in three-phase cable, the other end of the ring-in switch K1 is connected with a BUS BUS, and the ring-in switch K1 is linked with the travel relay R1; one end of the ring-out switch K4 is connected with the 10kV ring-out three-phase cable, the other end of the ring-out switch K4 is connected with the BUS BUS, and the ring-out switch K4 is linked with the travel auxiliary relay R2.
According to the conventional control circuit diagram shown in fig. 1, the voltage acquisition functions of the loop-in controller T3 and the loop-out controller T4 are relatively few, and the bus voltage transformer PT3 is required to determine the bus live condition, which may cause the bus voltage on the outdoor switch box automation equipment to be lost when the bus voltage transformer PT3 fails, and is not favorable for the safe operation of the equipment. Therefore, on the basis of not changing the original function (namely realizing the logic judgment of the voltage time type action), the improvement of related devices is proposed for the existing control circuit shown in fig. 1 to replace a bus voltage transformer PT3 to complete corresponding function, and the improvement comprises the steps of expanding the acquisition functions of the ring-in controller T1 and the ring-out controller T2, setting a travel relay R1 for linkage control of the ring-in switch K1 and setting a travel relay R2 for linkage control of the ring-out switch K4.
The loop-in controller T1 has, in addition to the independent switching control function for the loop-in switch K1, a "loop-in loop-out press-closing" function associated with the operation of the loop-out switch K4, and functions as: based on the fact that the 10kV ring-in three-phase cable and the 10kV ring-out three-phase cable have voltages at the same time, when the function is switched in, the ring-in switch K1 can be controlled in a delayed mode to be switched on, when the function is switched out, the ring-in switch K1 can be controlled in a delayed mode to be switched on, and the phenomenon that the ring-in switch K1 and the ring-out switch K4 are switched on at the same time is avoided. The two function activation of the loop controller T1 depends on the voltage U of the secondary side of the potential transformer PT1ab1The voltage U of the secondary side of the voltage transformer PT2bc1And the collection of the output signal of the travel relay R2.
Similarly, the loop-out controller T2 has a function of "loop-in loop-out press-closing" associated with the operation of the loop-in switch K1 in addition to the function of independent switching and closing control of the loop-out switch K4, and functions as: based on the fact that the 10kV ring-in three-phase cable and the 10kV ring-out three-phase cable have voltages at the same time, the ring-out switch K4 can be controlled to be switched on in a delayed mode when the function is switched in, and the ring-out switch K4 can be controlled to be switched on in a delayed mode when the function is switched out, so that the phenomenon that the ring-in switch K1 and the ring-out switch are switched on at the same time is avoided. The two function activations of the loop-out controller T2 need to depend on the voltage U of the secondary side of the potential transformer PT2bc1The voltage U of the secondary side of the voltage transformer PT1ab1And the collection of the output signal of the travel relay R1.
The implementation process of the invention comprises the following steps: (1) assuming that the 10kV loop-in three-phase cable is in an incoming call, the loop-in controller T1 is based on the detected Uab1Is non-zero value and Ubc1When the output signal of the travel relay is zero and the output signal of the travel relay is divided, executing internal single-side voltage delay closing control logic to control the closing of the ring-in switch K1, and controlling the output signal of the travel relay R1 to be in a closed state in a linkage manner at the moment, which indicates that the ring-out controller T2 can detect that the output signal of the travel relay R1 is in the closed state; at the same time, the loop-out controller T2 is based on the detected Uab1Is non-zero and Ubc1When the output signal of the travel relay R1 is in a closed state and zero value, executing internal single-side voltage delay closing control logic to control the closing of the loop-out switch K4; (2) based on the 10kV ring-in three-phase cable and the 10kV ring-out three-phase cable have voltages at the same time, the ring-in controller T1 detects Uab1And Ubc1Are all non-zero values, while the loop-out controller T2 detects Ubc1And Uab1If the values are non-zero values, the input of the function of ' ring in and ring out press closing ' in the ring in controller T1 and the control of ' ring in and ring out in the ring out controller T2 are controlledThe function of pressing and closing is exited, so that the ring-in switch K1 is in a closing state and the ring-out switch K4 keeps in a breaking state, thereby avoiding the risk of ring closing operation caused when the ring-in switch K1 and the ring-out switch K4 perform simultaneous closing.
In the embodiment of the invention, the judgment of the electrified condition on the equipment bus can be completed by collecting the output voltage of the voltage transformer PT1, the output voltage of the voltage transformer PT2, the output signal of the travel relay R1 and the output signal of the auxiliary relay R2, and the action logic judgment of the voltage time type is further realized; in addition, the embodiment of the invention can reduce the volume of equipment by replacing the function of the bus voltage transformer with the double auxiliary relays, thereby effectively saving the installation land.
The outdoor switch box automation equipment control circuit provided by the embodiment of the invention is described in detail, a specific example is adopted in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (4)
1. An outdoor switch box automation equipment control circuit is characterized in that the circuit comprises a loop-in controller T1, a loop-out controller T2, a switch travel relay R1, a switch travel relay R2, a voltage transformer PT1 and a voltage transformer PT 2; wherein the content of the first and second substances,
the primary side of the voltage transformer PT1 is connected with the phase A and the phase B in a 10kV loop-in three-phase cable, the secondary side of the voltage transformer PT1 is connected with the loop-in controller T1, the secondary side of the voltage transformer PT1 is connected with the loop-out controller T2, and the output end of the switch travel relay R1 is connected with the loop-out controller T2;
the primary side of the voltage transformer PT2 is connected with the phase B and the phase C in a 10kV loop-out three-phase cable, the secondary side of the voltage transformer PT2 is connected with the loop-out controller T2, the secondary side of the voltage transformer PT2 is connected with the loop-in controller T1, and the output end of the switch travel relay R2 is connected with the loop-out controller T1.
2. The outdoor switch box automation device control circuit of claim 1, the circuit further comprising a loop in switch K1;
one end of the ring-in switch K1 is connected with the 10kV ring-in three-phase cable, the other end of the ring-in switch K1 is connected with a BUS BUS, and the ring-in switch K1 is linked with the switch travel relay R1.
3. The outdoor switchbox automation device control circuit of claim 2, the circuit further comprising a loop-out switch K4;
one end of the ring-out switch K4 is connected with the 10kV ring-out three-phase cable, the other end of the ring-out switch K4 is connected with the BUS BUS, and the ring-out switch K4 is linked with the travel relay R2.
4. The outdoor switch box automation device control circuit of claim 3, the circuit further including but not limited to a branch switch K2 and a branch switch K3;
one end of the branch switch K2 is connected with a user side load, and the other end of the branch switch K2 is connected with the BUS BUS; one end of the branch switch K3 is connected with a user side load, and the other end of the branch switch K3 is connected with the BUS BUS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011078660.3A CN112491033A (en) | 2020-10-10 | 2020-10-10 | Outdoor switch box automation equipment control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011078660.3A CN112491033A (en) | 2020-10-10 | 2020-10-10 | Outdoor switch box automation equipment control circuit |
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| CN112491033A true CN112491033A (en) | 2021-03-12 |
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| CN202011078660.3A Pending CN112491033A (en) | 2020-10-10 | 2020-10-10 | Outdoor switch box automation equipment control circuit |
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Application publication date: 20210312 |