CN210223831U - Electric five-prevention locking loop - Google Patents
Electric five-prevention locking loop Download PDFInfo
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- CN210223831U CN210223831U CN201921264105.2U CN201921264105U CN210223831U CN 210223831 U CN210223831 U CN 210223831U CN 201921264105 U CN201921264105 U CN 201921264105U CN 210223831 U CN210223831 U CN 210223831U
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Abstract
The utility model provides an electric five-prevention locking loop, which comprises a grounding knife locking loop, a first isolating switch locking loop at a bus side, a second isolating switch locking loop, a third isolating switch locking loop at a line side and a temporary grounding knife locking loop; in the first isolating switch locking loop and the second isolating switch locking loop, the first isolating switch position dividing contact is connected with the common node through the temporary grounding switch locking loop, and the second isolating switch position dividing contact is connected with the common node through the temporary grounding switch locking loop. The common node is a node at which the first disconnecting switch branching contact and the second disconnecting switch branching contact are connected to the same position. After the temporary grounding knife is grounded, because the temporary grounding knife locking loop is connected or disconnected according to the bus voltage, the technical problems of casualties and equipment damage caused by mistakenly closing another isolating switch with a bus when the isolating switch of the current bus is debugged due to the fact that the temporary ground wire is lack of effective locking can be solved in a self-adaptive mode.
Description
Technical Field
The utility model relates to an electrical equipment overhauls technical field, especially relates to an electric five-prevention blocking circuit.
Background
The safety of the power grid puts forward the requirement of five-prevention of electrical equipment, wherein the electrical equipment with the voltage class of 110kV and above is definitely specified to preferably adopt the design principle of electrical anti-misoperation interlocking. Therefore, the arrangement of the electric lock on the secondary operation loop becomes an effective and feasible means for preventing accidents such as manual misoperation and the like. Switching operation is carried out according to a specified power cut-off sequence strictly, and a disconnecting switch with a ground wire is forbidden strictly.
As shown in fig. 1, a disconnecting switch 1G and a disconnecting switch 2G are arranged on a side of a certain line interval bus, wherein one end of the 1G disconnecting switch is connected with a first section of bus 1M, the other end of the 1G disconnecting switch is connected with a circuit breaker DL after being connected with the 2G disconnecting switch, one end of the 2G disconnecting switch is connected with a second section of bus 2M, and the other end of the 2G disconnecting switch is connected with the 1G disconnecting switch; the 2G isolating switch is connected with the 02G grounding switch and is of an integrated structure, and meanwhile, the 2G isolating switch and the 02G grounding switch have a mechanical interlocking relation, namely when the 2G isolating switch is in a closed position, the 02G grounding switch cannot be operated in a mechanical interlocking loop control mode, and when the 02G grounding switch is in a closed position, the 2G isolating switch cannot be operated in a mechanical interlocking loop control mode.
When the bus side interval 2G isolator in fig. 1 needs to be overhauled, the bus-bar interval is disconnected firstly, namely, the bus-bar circuit breaker ML is disconnected, the 1G isolator and the 2G isolator are disconnected, then the second section bus 2M is powered off, the operation is withdrawn with the overhaul interval, namely, the circuit breaker DL is disconnected, the 1G isolator, the 2G isolator and the 4G isolator are all arranged at the disconnection position, then the 02G grounding knife and the grounding knife IIGD1 on the second section bus 2M are all closed, the 2G two sides of the overhaul isolator are grounded, and the safety of maintainers is ensured.
When bus side interval 1G isolator in figure 1 needs to overhaul, earlier with the disconnection of female antithetical couplet interval, break off female antithetical couplet circuit breaker ML promptly, break off its 1G isolator and 2G isolator, then have a power failure with first section generating line 1M, will take the maintenance interval to withdraw from the operation, break off circuit breaker DL promptly, with 1G isolator, 2G isolator, 4G isolator all arranges the disconnection position in, then with the earthing knife IGD1 homoenergetic on 02G earthing knife and the first section generating line 1M on all closing, will take the earthing of maintenance isolator 1G both sides ground connection, guarantee maintainer safety.
However, since the on-off state of the disconnecting switch 1G and the disconnecting switch 2G needs to be checked during debugging in the maintenance process of the disconnecting switches 1G and 2G, and the 02G grounding switch needs to be separated when the switches need to be closed, the grounding point between the disconnecting switch 1G and the disconnecting switch 2G is lost, and the safety of personnel cannot be protected, a temporary grounding wire needs to be additionally hung, such as L02G in fig. 2, and the temporary grounding switch is denoted by L02G, that is, the temporary grounding switch L02G should be closed (in the closed position).
However, at present, the position of the temporary grounding switch does not have an electrical five-prevention lockout circuit (as shown in fig. 3) connected to the site, in the 1G control circuit in fig. 3, when the line side disconnecting switch 2G needs to be overhauled and debugged, the 02G grounding switch is separated (in a separation position), because the DL contact, the 02G contact, the 04G1 contact and the 2G contact are all in the separation position, the 1G control circuit can be unlocked for use, misoperation can occur to cause the 1G disconnecting switch to be closed, because the bus 1M is electrified, a worker has a serious safety problem in debugging the disconnecting switch 2G at this time, the disconnecting switch can be debugged often only by unlocking, and the disconnecting switch lockout circuit has no way to meet the need of self-adaptive maintenance, and is only suitable for the traditional switching operation.
Therefore, due to the lack of effective locking of the temporary ground wire, when the disconnecting switch of the current bus is debugged, casualties and equipment damage caused by mistakenly closing the disconnecting switch of another live bus become technical problems to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an electric five-prevention locking loop for solve because interim ground wire lacks effectual shutting, when the isolator of debugging current generating line, the technical problem of casualties, equipment damage that the isolator of another electrified generating line leads to is closed to the mistake, and can accomplish the needs that locking loop self-adaptation overhauld, need not any unblock key.
In view of the above, the present invention provides an electrical five-prevention locking circuit, which includes a grounding switch locking circuit, a first isolation switch locking circuit on a bus side, a second isolation switch locking circuit, a third isolation switch locking circuit on a line side, and a temporary grounding switch locking circuit;
in the first isolating switch locking loop and the second isolating switch locking loop, a first isolating switch separation contact is connected with a common node through the temporary grounding switch locking loop, and a second isolating switch separation contact is connected with the common node through the temporary grounding switch locking loop;
the common node is a node at which a first isolating switch position dividing contact and a second isolating switch position dividing contact are connected to the same position;
and when the temporary grounding knife is grounded, the temporary grounding knife locking loop is connected or disconnected according to the bus voltage.
Preferably, the temporary earthing switch blocking circuit between the second disconnecting switch indexing contact and the common node comprises: the temporary grounding knife comprises a first closed contact and a first voltage contact;
the common node, the first closing contact of the temporary grounding switch, the first voltage contact and the second disconnecting switch dividing contact are sequentially connected;
and the first closing contact of the temporary grounding knife is connected or disconnected according to the grounding state of the temporary grounding knife. The first voltage contact is connected or disconnected according to the voltage of the first bus corresponding to the first isolating switch.
Preferably, the temporary earthing switch blocking circuit between the first disconnecting switch indexing contact and the common node comprises: the temporary grounding knife comprises a first closed contact and a first voltage contact;
the common node, the temporary grounding switch second on-position contact, the second voltage contact and the first isolating switch off-position contact are sequentially connected;
and the second joint point of the temporary grounding knife is connected or disconnected according to the grounding state of the temporary grounding knife. And the second voltage contact is connected or disconnected according to the voltage of the second bus corresponding to the second isolating switch.
Preferably, the temporary earthing switch blocking circuit between the second disconnecting switch indexing contact and the common node further comprises: a first position-dividing contact of the temporary grounding knife;
and a branch formed by the first closing contact of the temporary grounding knife and the first voltage contact is connected with the first dividing contact of the temporary grounding knife in parallel.
Preferably, the temporary earthing switch blocking circuit between the first disconnecting switch indexing contact and the common node further comprises: a second position-dividing contact of the temporary grounding knife;
and a branch formed by the second closing contact of the temporary grounding knife and the second voltage contact is connected with the second dividing contact of the temporary grounding knife in parallel.
Preferably, each contact in the electrical fail-safe circuit is from a relay contact.
Preferably, the first voltage contact and the second voltage contact are both from three-phase no-voltage relay contacts.
Preferably, the three-phase voltage-free relay detects the voltages of a630, B630, C630 and N600 on the bus.
Preferably, when the voltages among the a630, the B630, the C630 and the N600 are all less than a settable low-voltage fixed value of 1, the three-phase voltage-free relay detection bus is voltage-free.
According to the technical solution provided by the utility model, the embodiment of the utility model has the following advantage:
the utility model provides an electric five-prevention locking loop, which comprises a grounding knife locking loop, a first isolating switch locking loop at a bus side, a second isolating switch locking loop, a third isolating switch locking loop at a line side and a temporary grounding knife locking loop; in the first isolating switch locking loop and the second isolating switch locking loop, the first isolating switch position dividing contact is connected with the common node through the temporary grounding switch locking loop, and the second isolating switch position dividing contact is connected with the common node through the temporary grounding switch locking loop. The common node is a node at which the first disconnecting switch branching contact and the second disconnecting switch branching contact are connected to the same position. After the temporary grounding knife is grounded, because the temporary grounding knife locking loop is connected or disconnected according to the bus voltage, the technical problems of casualties and equipment damage caused by mistakenly closing another isolating switch with a live bus when the isolating switch of the current bus is debugged due to the fact that the temporary ground wire is lack of effective locking can be solved, and the requirement of the locking loop for adaptively overhauling the hung temporary ground wire can be met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 inventive exercise.
FIG. 1 is a schematic diagram of a field-oriented actual main wiring;
FIG. 2 is a schematic diagram of an actual main connection line after a field temporary grounding line is connected;
fig. 3 is a schematic structural diagram of a conventional electric five-prevention locking circuit;
fig. 4 is a schematic structural diagram of an embodiment of an electrical five-prevention lockout circuit provided in an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a temporary grounding switch locking loop between a second disconnecting switch tap point and a common node;
FIG. 6 is a schematic structural diagram of a temporary grounding switch locking loop between a first disconnecting switch tap point and a common node;
FIG. 7 is a schematic diagram of a first voltage contact.
Detailed Description
The embodiment of the utility model discloses electric five prevent shutting return circuit for because interim ground wire lacks effectual shutting, when the isolator of debugging current generating line, the technical problem of casualties, equipment damage that the isolator of another electrified generating line leads to is closed to the mistake, abandons original way of leaning on the unblock debugging, accomplishes shutting return circuit self-adaptation.
Referring to fig. 4, an embodiment of an electrical five-prevention locking circuit provided by the present invention includes: the temporary grounding knife locking circuit b, the temporary grounding knife locking circuit c, the grounding knife locking circuit, the first isolating switch locking circuit on the bus side, the second isolating switch locking circuit and the third isolating switch locking circuit on the line side.
Note that each contact in fig. 4 corresponds to each of the disconnecting switch and the grounding switch in fig. 2.
The embodiment of the utility model provides an in first isolator shutting return circuit include: DL tap, 02G tap, 04G1 tap, temporary grounding switch latch circuit b, 2G tap, 2G off-position and 1G control circuit. The second isolator latching circuit includes: DL tap, 02G tap, 04G1 tap, temporary grounding knife latch-up circuit c, 1G tap, 1G off-set and 2G control circuit. The third isolator latching circuit includes: DL tap, 02G tap, 04G1 tap, 04G2 tap, and 4G control loop. And the grounding knife locking loop has three: namely (1) a loop consisting of a DL tap point, a 1G tap point, a 2G tap point, a 4G tap point and a 02G control loop; (2) a loop consisting of a DL tap point, a 1G tap point, a 2G tap point, a 4G tap point and a 04G1 control loop; (3) DK7 on-position contact, YJS off-position contact, 4G off-position contact and 04G2 control loop.
In the first isolating switch locking loop and the second isolating switch locking loop, a first isolating switch position dividing contact (namely 1G position dividing contact) is connected with a common node a through a temporary grounding switch locking loop c, and a second isolating switch position dividing contact (namely 2G position dividing contact) is connected with the common node a through a temporary grounding switch locking loop b.
The common node a is a node where the first disconnecting switch potential dividing contact and the second disconnecting switch potential dividing contact are connected to the same position.
After the temporary grounding knife is grounded, the temporary grounding knife locking loop b or c is connected or disconnected according to the bus voltage, so that the technical problems of casualties and equipment damage caused by mistakenly closing another isolating switch with a live bus when the isolating switch of the current bus is debugged due to the fact that the temporary ground wire is lack of effective locking can be solved.
Further, as shown in fig. 5, the temporary earthing switch locking loop b between the second disconnecting switch tap point and the common node a includes: the temporary grounding knife first engaging contact k1, the first voltage contact k2 and the temporary grounding knife first dividing contact k 3.
The common node a, the first on-position contact k1 of the temporary grounding switch, the first voltage contact k2 and the second isolating switch off-position contact are connected in sequence.
The first joint point k1 of the temporary grounding knife and the branch of the first voltage contact forming k2 are connected in parallel with the first division point k3 of the temporary grounding knife.
The temporary grounding knife first engaging contact k1 is turned on or off according to the grounding state of the temporary grounding knife, that is, when the temporary grounding knife L02G in fig. 2 is grounded, the temporary grounding knife first engaging contact k1 is turned on, and is turned off when the temporary grounding knife is not grounded. The first voltage contact k2 is connected or disconnected according to the voltage of the first bus corresponding to the first isolating switch, that is, when the voltage of the bus 1M in fig. 2 is lower than the setting low voltage fixed value 1, the first voltage contact k2 is connected, and when the voltage is higher than the voltage fixed value 2, the first voltage contact k2 is disconnected. The condition for determining whether the temporary grounding switch first indexing contact k3 is turned on or off is opposite to the condition for determining the temporary grounding switch first engaging contact k 1.
Further, as shown in fig. 6, the temporary earthing switch locking loop c between the first disconnecting switch tap point and the common node a includes: the second on-position contact k4 of the temporary grounding knife, the first voltage contact k5 and the second off-position contact k6 of the temporary grounding knife.
The common node a, the temporary grounding switch second closing contact k4, the second voltage contact k5 and the first isolating switch separating contact k6 are connected in sequence.
The branch consisting of the second on-position contact k4 of the temporary grounding knife and the second voltage contact k5 is connected in parallel with the second dividing contact k6 of the temporary grounding knife.
The temporary grounding knife second engaging contact k4 is turned on or off according to the grounding state of the temporary grounding knife, that is, when the temporary grounding knife L02G in fig. 2 is grounded, the temporary grounding knife second engaging contact k4 is turned on, and is turned off when the temporary grounding knife is not grounded. The second voltage contact k5 is connected or disconnected according to the voltage of the second bus corresponding to the second isolating switch, that is, when the bus 2M voltage in fig. 2 is lower than the setting low voltage fixed value 1, the second voltage contact k5 is connected, and when the bus is higher than the voltage fixed value 2, the second voltage contact k5 is disconnected. The condition for determining whether the temporary grounding switch second indexing contact k6 is on or off is opposite to the condition for determining the temporary grounding switch second indexing contact k 4.
Furthermore, the embodiments of the present invention provide that each contact in the electrical five-prevention lockout circuit comes from an auxiliary contact or a relay contact. And the first voltage contact k2 and the second voltage contact k5 are both from three-phase no-voltage relay contacts. As shown in fig. 7 (taking the first voltage contact k2 as an example), the three-phase-all-no-voltage relay detects the voltages between a630, B630, C630 and N600 on the bus. When the voltages among A630, B630, C630 and N600 are all smaller than the settable low-voltage fixed value 1, the three-phase voltage-free relay detection bus is free of voltage.
In this embodiment, the on contact means that the switch or the grounding knife corresponding to the contact is in a closed state in fig. 2, the on contact in fig. 4 is turned on, and the off contact means that the switch or the grounding knife corresponding to the contact is in an open state in fig. 2, the on contact in fig. 4 is turned on.
It will be right below that the utility model provides a working process of five electric locking return circuits introduces:
in fig. 2, when isolator 2G overhauls and need install interim ground wire L02G additional after, want the operation with isolator 1G, because the utility model provides an existence of the electric five prevent blocking circuit's interim earthing knife blocking circuit b, must satisfy "L02G closed position" and "bus 1M does not have voltage" two contacts (i.e. the first closed position contact k1 of interim earthing knife, first voltage contact k2) and all put through, must satisfy "first section bus 1M voltage transformer three-phase all does not have electricity" when interim earthing knife L02G is grounded and allow operation 1G isolator. When the temporary grounding blade L02G is not grounded, the tap point (the first tap point k3) of the temporary grounding blade L02G is turned on, and the latch circuit is shorted, thereby restoring the normal latch connection as shown in fig. 3. When the temporary ground wire L02G needs to be additionally installed during maintenance of the disconnecting switch 2G, in order to operate the disconnecting switch 2G, it is necessary to satisfy that both the two contacts of "L02G on position" and "2M voltage-free" (i.e. the second on position contact k4 and the second voltage contact k5 of the temporary grounding knife) are switched on, i.e. when the temporary grounding knife L02G is grounded, it is necessary to satisfy that "three phases of the second section bus 2M voltage mutual inductance are both free of power" to allow the disconnecting switch 2G to be operated. When the "temporary grounding blade L02G is not grounded", the tap point of the temporary grounding blade L02G (the second tap point k6) is turned on, and the latch circuit is shorted, and the normal latch connection as in fig. 3 is restored.
Similarly, when isolator 1G overhauls and need install interim ground wire L02G additional after, want the operation with isolator 2G, because the utility model provides an existence of the electric five prevent blocking circuit's interim earthing knife blocking circuit c, must satisfy "L02G closes a position" and "2M does not have voltage" two contacts (being interim earthing knife second closes a position contact k4, second voltage contact k5) and all switches on, must satisfy "the mutual inductance three-phase of second section generating line 2M voltage all does not have electricity" when interim earthing knife L02G when the ground connection just allows operation isolator 2G. When the "temporary grounding blade L02G is not grounded", the tap point of the temporary grounding blade L02G (the second tap point k6) is turned on, and the latch circuit is shorted, and the normal latch connection as in fig. 3 is restored. When the disconnecting switch 1G needs to be additionally provided with the temporary ground wire L02G for maintenance, in order to operate the disconnecting switch 1G, it is necessary to satisfy that both contacts of "L02G on" and "bus 1M no-voltage" (i.e. the first on contact k1 and the first voltage contact k2 of the temporary grounding switch) are switched on, i.e. when the temporary grounding switch L02G is grounded, it is necessary to satisfy that "three phases of the first section bus 1M voltage transformer are all without power" to allow the 1G disconnecting switch to be operated. When the temporary grounding blade L02G is not grounded, the tap point (the first tap point k3) of the temporary grounding blade L02G is turned on, and the latch circuit is shorted, thereby restoring the normal latch connection as shown in fig. 3.
Therefore, through the utility model provides an electric five-prevention blocking circuit, when "earthing for work line is in the access position", only the generating line three-phase voltage that corresponds does not have sometimes, just allow the isolation switch that the operation corresponds, it is short circuited to do not insert position "new-increase blocking circuit when" earthing for work line, resume original block state, do not influence other operations, also need plus to remove the blocking circuit, consequently, this phase new-increase blocking circuit, only just play a role after coming into use to the earthing for work line, fine pertinence has, can effectively prevent to take earthing for work line mistake to close isolator's occurence of failure, also can avoid the mistake unblock, and the adaptivity has.
The utility model discloses the method of leaning on artificial management's method to ensure that pernicious maloperation does not take place for interim ground wire before having overturned, because the interval of walking by mistake often takes place for people's reason, and the artificial unblock leads to pernicious maloperation's method, and new shutting return circuit will be changed to technical defence by the people's air defense. As long as the temporary ground wire is hung, the disconnecting switch on the bus side with the electrified overhaul interval cannot be operated, so that the occurrence of malignant misoperation is avoided, and the normal switching operation is not influenced.
It is right above the utility model provides an electrical five-prevention locking circuit has carried out detailed introduction, to the general technical personnel in this field, according to the utility model discloses the thought of embodiment all has the change part on concrete implementation and application scope, to sum up, this description content should not be understood as right the utility model discloses a restriction.
Claims (9)
1. The utility model provides an electric five prevent shutting return circuit, includes that the first isolator of earthing switch shutting return circuit, bus side, second isolator shutting return circuit and the third isolator of line side shutting return circuit, its characterized in that still includes: a temporary grounding knife locking loop;
in the first isolating switch locking loop and the second isolating switch locking loop, a first isolating switch separation contact is connected with a common node through the temporary grounding switch locking loop, and a second isolating switch separation contact is connected with the common node through the temporary grounding switch locking loop;
the common node is a node at which a first isolating switch position dividing contact and a second isolating switch position dividing contact are connected to the same position;
and when the temporary grounding knife is grounded, the temporary grounding knife locking loop is connected or disconnected according to the bus voltage.
2. The electrical five-prevention latch-up circuit of claim 1, wherein the temporary grounding switch latch-up circuit between the second isolator tap node and the common node comprises: the temporary grounding knife comprises a first closed contact and a first voltage contact;
the common node, the first closing contact of the temporary grounding switch, the first voltage contact and the second disconnecting switch dividing contact are sequentially connected;
the first closing contact of the temporary grounding knife is connected or disconnected according to the grounding state of the temporary grounding knife; the first voltage contact is connected or disconnected according to the voltage of the first bus corresponding to the first isolating switch.
3. The electrical five-prevention latch-up circuit of claim 2, wherein the temporary grounding switch latch-up circuit between the first isolator tap node and the common node comprises: the temporary grounding knife comprises a second on contact and a second voltage contact;
the common node, the temporary grounding switch second on-position contact, the second voltage contact and the first isolating switch off-position contact are sequentially connected;
the second joint point of the temporary grounding knife is connected or disconnected according to the grounding state of the temporary grounding knife; and the second voltage contact is connected or disconnected according to the voltage of the second bus corresponding to the second isolating switch.
4. The electrical five-prevention latch-up circuit of claim 3, wherein the temporary grounding switch latch-up circuit between the second isolator tap node and the common node further comprises: a first temporary grounding knife first position-dividing contact;
and a branch formed by the first closing contact of the temporary grounding knife and the first voltage contact is connected with the first dividing contact of the temporary grounding knife in parallel.
5. The electrical five-prevention latch-up circuit of claim 4, wherein the temporary grounding switch latch-up circuit between the first isolator tap node and the common node further comprises: a second position-dividing contact of the temporary grounding knife;
and a branch formed by the second closing contact of the temporary grounding knife and the second voltage contact is connected with the second dividing contact of the temporary grounding knife in parallel.
6. The electrical five-prevention latch circuit of claim 5 wherein each contact in the electrical five-prevention latch circuit is a contact of a relay.
7. The electrical fail-safe latching circuit of claim 6, wherein the first voltage contact and the second voltage contact are both contacts of a no voltage relay for both three phases.
8. The electrical fail safe latching circuit of claim 7 wherein the three phase no voltage relay detects the voltage of a630, B630, C630 and N600 on the bus.
9. The electrical five-prevention lockout circuit of claim 8 wherein the three-phase no-voltage relay detection bus is no voltage when the voltages between a630, B630, C630 and N600 are all less than a settable low voltage set point of 1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921264105.2U CN210223831U (en) | 2019-08-06 | 2019-08-06 | Electric five-prevention locking loop |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921264105.2U CN210223831U (en) | 2019-08-06 | 2019-08-06 | Electric five-prevention locking loop |
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| CN210223831U true CN210223831U (en) | 2020-03-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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