CN219592121U - Distributed switching locking small bus structure - Google Patents

Abstract

The utility model discloses a distributed switching locking small bus structure, which comprises a switching locking small bus, an outgoing line interval site terminal box, a main transformer interval site terminal box and a bus-bar interval site terminal box, wherein the four are mutually connected and combined to play a role.

Description

Distributed switching locking small bus structure

Technical Field

The utility model relates to the field of electrical equipment, in particular to a distributed switching locking busbar structure.

Background

In an AIS transformer substation in a current 110kV/220kV double-bus bypass wiring mode, the anti-misoperation locking of a line and main transformer interval isolation knife in the main bus switching operation or the auxiliary bus switching operation is generally realized by adopting the following two modes:

class a mode: the independent bus-bar interval 'isolation knife position signal + breaker position signal (series connection)' is directly adopted to respectively lead to corresponding lines and main transformer intervals (preventing the mixed use of power and parasitic loop) as the electric locking condition of the isolation knife. However, because the bus-bar interval is required to isolate more auxiliary contacts and more cables of the knife switch and the breaker, the bus-bar interval is practically only applicable to a transformer substation with a smaller 110kV (or 220 kV) system scale, and the line and main transformer interval is generally less than 8 times.

Type B mode: for a transformer substation with a large 110kV (or 220 kV) system scale, the line and main transformer intervals are generally more than 8 times, even up to 12-16 times, and the transformer substation is obviously unsuitable for adopting mutually independent electric locking loops, because a large number of control cables are difficult to install, and the quantity of auxiliary contacts of an isolating switch blade and a circuit breaker cannot meet the requirement. The operation and maintenance units generally adopt an organization procedure, namely, the operation procedure is defined on the switching operation procedure.

In summary, the following drawbacks exist for the prior art and for the practical operation:

(1) in an AIS transformer substation in the existing 110kV/220kV double-bus bypass wiring mode, the A type mode needs more auxiliary contacts and cables of a bus-bar isolating switch blade and a breaker, has a small application range, is generally only suitable for the transformer substation with a smaller 110kV (or 220 kV) system scale, and has a line and main transformer interval of generally less than 8 times;

(2) the above-mentioned type B mode is not suitable for adopting mutually independent electric closed loops any more, because a large number of control cables are difficult to install, the quantity of auxiliary contacts of the isolating switch blade and the breaker cannot meet the requirement, and an operation and maintenance unit generally adopts an organization program, namely, the operation and maintenance unit is regulated from the switching operation program;

(3) whether in a class A or class B mode, or without expansibility, or without intrinsically safe electrical locking guarantee.

Disclosure of Invention

Aiming at the defects of the prior art, the utility model provides a distributed switching locking small bus structure to solve the problems.

In order to achieve the above object, the present utility model is achieved by the following technical scheme.

A distributed switching lockout busbar structure comprising a switching lockout busbar, an outgoing line spacing field terminal box, a main transformer spacing field terminal box, a bus bar spacing field terminal box, which are connected in sequence and connected in parallel respectively with the outgoing line spacing field terminal box, the main transformer spacing field terminal box, the bus bar spacing field terminal box comprising 1M busbar side isolation blade auxiliary contacts 1LG (in the claims) auxiliary contacts 1LG, 2M busbar side isolation blade auxiliary contacts 2LG (in the claims) in simplified form as isolation blade 2 LG), bus bar spacing breaker auxiliary contacts MDL (in the claims) in simplified form as circuit breakers MDL, a switching operation enabling signal relay JJ, the 1M busbar side isolation blade auxiliary contacts 1LG, 2M busbar side isolation blade auxiliary contacts 2, bus bar spacing breaker auxiliary contacts MDL being serially activatable, the outgoing line spacing auxiliary contacts 1LG, the reduced phase bar side isolation blade auxiliary contacts 1LG, the 2M auxiliary contacts 1G, the reduced phase bar side isolation blade auxiliary contacts 2G, the three (in the claims) in simplified form as isolation blade auxiliary contacts 1G), the three (in the claims) in simplified form as isolation blade auxiliary contacts 1G, 3G auxiliary contacts 3G, three switch-off switches 3G auxiliary contacts 3G, and three switch-off switches 3G auxiliary contacts 3G (in the three of the three switches, the structure is suitable for a 'small bus + distributed start' electric locking loop of the AIS isolation knife under a 110kV/220kV double-bus bypass wiring mode, meets all interval electric locking guarantees, and can realize theoretical infinite expansion.

Preferably, the intermediate relay 1ZJ is connected to the switching locking busbar through a switching handle QK.

Preferably, the switching locking busbar comprises +BLM and-BLM.

Preferably, the-BLM is always negatively charged to-110V, and +blm is not charged (or is virtually negatively charged), which means that the switching operation is prohibited at the line interval and the main transformer interval.

Preferably, the +blm is negatively charged to-110V before the locking condition is satisfied, the +blm is positively charged to +110v after the locking condition is satisfied, and the +blm is positively charged to +110v, which indicates that the main buses 1M and 2M of the electric primary system are closed (the bus connection intervals 1LG, DL and 2LG are all closed), and the line interval and the main transformer interval are allowed to be subjected to reverse operation.

Preferably, the switching locking small bus is 1 low-voltage power cable, and the low-voltage power cable is 2 cores and 4 square millimeters.

Preferably, the 1G opening and closing loop is a 1M bus side isolation knife auxiliary contact 1G, a 2M bus side isolation knife auxiliary contact 2G, a breaker auxiliary contact DL, a line side isolation knife auxiliary contact 3G, an intermediate relay 1ZJ, and a switching handle QK, which are sequentially connected, and the 1G opening and closing loop is connected to a 1M bus side isolation knife auxiliary contact 1G closing position, a 2M bus side isolation knife auxiliary contact 2G opening position, a breaker auxiliary contact DL closing position, a line side isolation knife auxiliary contact 3G closing position, an intermediate relay 1ZJ closing position, and a switching handle QK closing position.

Preferably, the 2G opening and closing loop is connected with the 1M busbar side isolation knife auxiliary contact 1G and the 2M busbar side isolation knife auxiliary contact 2G of the 1G opening and closing loop in parallel, and another group of 1M busbar side isolation knife auxiliary contacts 1G and 2M busbar side isolation knife auxiliary contacts 2G are arranged, and the 2G opening and closing loop is connected with the 1M busbar side isolation knife auxiliary contact 1G split position, the 2M busbar side isolation knife auxiliary contact 2G split position, the breaker auxiliary contact DL split position, the line side isolation knife auxiliary contact 3G split position, the intermediate relay 1ZJ split position and the switching handle QK split position.

The operation method of the distributed switching locking small bus structure comprises the following steps: (1) the method comprises the steps that a switching locking small bus is allowed to be operated in a reverse mode, a front condition 1M of bus side isolation knife auxiliary contact 1LG is matched with a bus isolation interval breaker auxiliary contact MDL and a bus isolation knife auxiliary contact 2LG is matched with the bus isolation interval breaker auxiliary contact 2LG and then runs in parallel, and the switching locking small bus is formed with a bus isolation site terminal box in situ, wherein-BLM is always negatively charged to-110V, the locking condition of +BLM in the bus isolation site terminal box meets the front negatively charged to-110V, and the locking condition of the bus isolation site terminal box meets the rear positively charged to +110V;

(2) the switching locking small bus is led to the outgoing line interval site terminal box and the main transformer interval site terminal box respectively, and is led to be connected by adopting a 2-core 4-square millimeter low-voltage power cable;

(3) 1 intermediate relay 1ZJ is arranged in all the outlet space field terminal boxes and the main transformer space field terminal boxes, and after the locking condition is met, any outlet space field terminal box or the main transformer space field terminal box is accessed to a space switching locking busbar through a switching handle QK to realize the distributed start of the cross-space parallel operation condition;

(4) and the normally open contact of the intermediate relay 1ZJ is connected with the locking condition of the outlet space field terminal box and the main transformer space field terminal box in series, so that an integral distributed operation logic method can be formed.

The locking conditions of the bus-tie spacing field terminal box are as follows: 1M bus side isolation knife auxiliary contact 1LG is closed + bus bar isolation breaker auxiliary contact MDL is closed +2M bus side isolation knife auxiliary contact 2LG is closed;

the locking conditions of any one of the outlet space field terminal boxes or the main transformer space field terminal boxes are respectively as follows: the 1G opening and closing loop is connected, the 2G opening and closing loop is connected,

the 1G opening and closing loop is connected: 1M bus side isolation knife auxiliary contact 1G closing position, 2M bus side isolation knife auxiliary contact 2G separating position, breaker auxiliary contact DL closing position and line side isolation knife auxiliary contact 3G closing position;

the 2G opening and closing loop is connected: 1M bus side isolation knife auxiliary contact 1G is separated, 2M bus side isolation knife auxiliary contact 2G is combined, breaker auxiliary contact DL is combined, and line side isolation knife auxiliary contact 3G is combined.

Compared with the prior art, the utility model discloses a distributed switching locking busbar structure, which comprises switching locking busbars, an outgoing line interval field terminal box, a main transformer interval field terminal box and a bus connection interval field terminal box which are mutually connected and combined to play a role,

(1) the structure is suitable for a 'small bus + distributed start' electric locking loop of an AIS isolation knife under a 110kV/220kV double-bus bypass wiring mode, meets electric locking guarantee of all intervals, and can realize theoretical infinite expansion;

(2) the control cable installation of the bus-tie interval and the auxiliary contacts of the bus-tie isolation knife blade and the bus-tie circuit breaker are reduced, and only 1 2-core 4-square millimeter low-voltage power cable and 1 group of auxiliary contacts of the bus-tie isolation knife blade and the bus-tie circuit breaker are actually installed;

(3) the scheme reduces construction investment, realizes intrinsic safety of operation, and powerfully ensures safe and stable operation of the power equipment.

Drawings

FIG. 1 is a schematic diagram of a distributed switching locking busbar structure according to the present utility model;

FIG. 2 is a block diagram of a prior art scheme A of the present utility model;

FIG. 3 is a schematic view of a prior art female-to-male spacing field terminal box;

FIG. 4 is a schematic view of a prior art main transformer spacing field terminal box;

fig. 5 is a schematic structural view of a terminal box for a wire outlet space field according to the prior art of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.

The distributed switching locking small bus structure comprises a switching locking small bus, a wire outlet spacing field terminal box, a main transformer spacing field terminal box and a bus bar spacing field terminal box, wherein the switching locking small bus is respectively connected with the wire outlet spacing field terminal box, the main transformer spacing field terminal box and the bus bar spacing field terminal box in sequence, the bus bar spacing field terminal box comprises a 1M bus bar side isolation knife auxiliary contact 1LG, a 2M bus bar side isolation knife auxiliary contact 2LG, a bus bar spacing breaker auxiliary contact MDL and a switching operation permission starting signal relay JJ, the three of the 1M bus side isolation knife auxiliary contact 1LG, the 2M bus side isolation knife auxiliary contact 2LG and the bus-bar interval breaker auxiliary contact MDL can be connected in series to start a switching locking small bus, an outgoing line interval field terminal box and a main transformer interval field terminal box are internally provided with an intermediate relay 1ZJ, a switching handle QK, the 1M bus side isolation knife auxiliary contact 1G, the 2M bus side isolation knife auxiliary contact 2G, a line side isolation knife auxiliary contact 3G and a breaker auxiliary contact DL, and the six can be connected with each other to respectively control a 1G switching circuit and a 2G switching circuit. The intermediate relay 1ZJ is connected with a switching locking busbar through a switching handle QK, the switching locking busbar comprises +BLM and +BLM, the +BLM is always negatively charged to-110V, the +BLM is uncharged (or is virtually negatively charged) to inhibit the line interval and the main transformer interval from being inverted, the +BLM is positively charged to-110V before the locking condition is met, the +BLM is positively charged to +110V after the locking condition is met, the +BLM is positively charged to +110V, the +BLM is used for indicating that the main busbars 1M and 2M of the electric primary system have been looped (the bus intervals 1LG, DL and 2LG are all closed), the line interval and the main transformer interval are allowed to be inverted, the switching locking busbar is 1 low-voltage power cable, the low-voltage power cable is 2-core 4 square millimeters, the 1G switching circuit is 1M busbar side isolation blade auxiliary contacts 1G, 2M busbar auxiliary contacts 2G, a breaker auxiliary contacts DL, line side isolation blade auxiliary contacts 3G, the intermediate relay QZK and the switching handle QK, the six are connected in sequence, a 1G opening and closing loop is connected into a 1M bus side isolation knife auxiliary contact 1G closing position, a 2M bus side isolation knife auxiliary contact 2G opening position, a breaker auxiliary contact DL closing position, a line side isolation knife auxiliary contact 3G closing position, an intermediate relay 1ZJ closing position and a switching handle QK closing position, the 2G opening and closing loop is connected with the 1M bus side isolation knife auxiliary contact 1G and the 2M bus side isolation knife auxiliary contact 2G of the 1G opening and closing loop in parallel, another group of 1M bus side isolation knife auxiliary contacts 1G and 2M bus side isolation knife auxiliary contact 2G are arranged, and the 2G opening and closing loop is connected into a 1M bus side isolation knife auxiliary contact 1G opening position, a 2M bus side isolation knife auxiliary contact 2G closing position, a 2G opening and closing loop, the auxiliary contact DL of the breaker is closed, the auxiliary contact 3G of the line side isolation switch blade is closed, the intermediate relay 1ZJ is closed, and the switching handle QK is closed.

The anti-misoperation locking principle of the 1M bus side isolation knife auxiliary contact 1G and 2M bus side isolation knife auxiliary contact 2G of all the outlet space field terminal boxes and the main transformer space field terminal boxes in switching locking small bus switching operation comprises the following specific contents: the auxiliary contacts 1LG and 2M of the isolating switch blade on the side of the 1M bus and the auxiliary contacts 2LG of the isolating switch blade on the side of the 2M bus and the auxiliary contacts MDL of the bus-bar isolating circuit breaker are all in the same position, the small bus is closed and operated by switching, and the auxiliary contacts 1G and 2G of the isolating switch blade on the side of the 1M bus of the terminal box of the space between the main transformer and the line can be switched as required. When the staff operates, the outlet space field terminal box or the main transformer space field terminal box can be selectively opened according to the requirements, in addition, a lock can be arranged on the switching handle QK, unlocking is performed according to an adaptive key, and the next operation (the arrangement principle of one lock at intervals) is performed.

The locking condition of the bus-tie spacing field terminal box is as follows: 1M bus side isolation knife auxiliary contact 1LG is closed + bus bar isolation breaker auxiliary contact MDL is closed +2M bus side isolation knife auxiliary contact 2LG is closed;

the locking conditions of any one of the outlet space field terminal boxes or the main transformer space field terminal boxes are respectively as follows: the 1G opening and closing loop is connected, and the 2G opening and closing loop is connected

The 1G opening and closing loop is connected: 1M bus side isolation knife auxiliary contact 1G closing position, 2M bus side isolation knife auxiliary contact 2G separating position, breaker auxiliary contact DL closing position and line side isolation knife auxiliary contact 3G closing position;

the 2G opening and closing loop is connected: 1M bus side isolation knife auxiliary contact 1G is separated, 2M bus side isolation knife auxiliary contact 2G is combined, breaker auxiliary contact DL is combined, and line side isolation knife auxiliary contact 3G is combined.

The switching operation locking improved loop operation method of the switching locking small bus mainly comprises the following steps of:

(1) the method comprises the steps of (1) forming a switching locking small bus (+ BLM, -BLM under the condition that the switching locking small bus allows the reverse operation to be pre-arranged (1M bus side isolation knife auxiliary contact 1LG is combined with a bus bar side isolation knife auxiliary contact 2 LG) on site (bus bar space terminal box), wherein-BLM is negatively charged to-110V normally, +BLM is negatively charged to-110V in front of the locking condition of the bus bar space terminal box, and the locking condition of the bus bar space terminal box meets the following positive charge +110V);

(2) the switching locking small buses (+BLM, -BLM) are respectively led to the outlet space field terminal box and the main transformer space field terminal box (which are connected by adopting a 2-core 4-square millimeter voltage cable).

(3) 1 intermediate relay 1ZJ is configured in all the outlet space field terminal boxes and the main transformer space field terminal boxes, and after the locking condition is met, any outlet space field terminal box or the main transformer space field terminal box is accessed into a space switching locking busbar (+ BLM and BLM) through a switching handle QK, so that the distributed start of the cross-space parallel operation condition is realized. The switching handle QK is mainly used for inputting and withdrawing the non-operation time during operation, so that loop energy conservation can be realized, and the running time of equipment can be prolonged.

(4) The normally open contact of the distributed start relay 1ZJ is connected in series with the electric locking condition in the line or main transformer interval, thus forming an integral distributed operation logic method.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (8)

1. A distributed switching locking busbar structure is characterized in that: the switching locking small bus, the outgoing line interval field terminal box, the main transformer interval field terminal box and the bus-bar interval field terminal box are connected in sequence, the switching locking small bus is connected with the outgoing line interval field terminal box, the main transformer interval field terminal box and the bus-bar interval field terminal box in parallel, the bus-bar interval field terminal box comprises an isolation switch blade 1LG, an isolation switch blade 2LG, a circuit breaker MDL and a switching operation starting signal relay JJ, the isolation switch blade 1LG, the isolation switch blade 2LG and the circuit breaker MDL can be connected in series to start the switching locking small bus, and the outgoing line interval field terminal box and the main transformer interval field terminal box both comprise an intermediate relay 1ZJ, a switching handle QK, an isolation switch blade 1G, an isolation switch blade 2G, an isolation switch blade 3G and a circuit breaker DL which can be connected with each other to respectively control a 1G switching circuit and a 2G switching circuit.

2. The distributed switching locking busbar structure of claim 1, wherein: the intermediate relay 1ZJ is connected into the switching locking busbar through the switching handle QK.

3. The distributed switching locking busbar structure of claim 2, wherein: the switching locking busbar comprises +BLM and-BLM.

4. The distributed switching locking busbar structure of claim 3, wherein: the-BLM is often negatively charged-110V.

5. The distributed switching locking busbar structure of claim 4, wherein: the locking condition of the +BLM on the bus-tie spacing field terminal box meets the front negatively charged-110V, and the locking condition of the bus-tie spacing field terminal box meets the rear positively charged +110V.

6. The distributed switching locking busbar structure of claim 2, wherein: the switching locking busbar is 1 low-voltage power cable, and the low-voltage power cable is 2 cores and 4 square millimeters.

7. The distributed switching locking busbar structure of claim 1, wherein: the 1G switching-on and switching-off loop is composed of an isolation switch blade 1G, an isolation switch blade 2G, a circuit breaker DL, an isolation switch blade 3G, an intermediate relay 1ZJ and a switching handle QK, the six are sequentially connected, and the 1G switching-on and switching-off loop is connected with the isolation switch blade 1G in-position, the isolation switch blade 2G in-position, the circuit breaker DL in-position, the isolation switch blade 3G in-position, the intermediate relay 1ZJ in-position and the switching handle QK in-position.

8. The distributed switching locking busbar structure of claim 7, wherein: the 2G opening and closing loop is connected with the isolation switch blade 1G and the isolation switch blade 2G of the 1G opening and closing loop in parallel, the other group of isolation switch blade 1G and the isolation switch blade 2G are arranged, and the 2G opening and closing loop is connected with the isolation switch blade 1G opening and closing position, the isolation switch blade 2G closing position, the circuit breaker DL closing position, the isolation switch blade 3G closing position, the intermediate relay 1ZJ closing position and the switching handle QK closing position.