CN110880742A - A high-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure - Google Patents

Abstract

The present invention provides a secondary circuit structure for three-phase inconsistency protection of a high-voltage circuit breaker body, including a three-phase inconsistency starting circuit for a high-voltage circuit breaker arranged in a circuit breaker control box, a time relay arranged in a protection screen of a relay protection room, and a preset The trip relay on the trip relay circuit in the circuit breaker operation box of the protection screen of the relay protection room; the starting circuit introduces positive electricity into the positive and negative terminals of the coil of the time relay, and after the positive and negative terminals of the trip relay coil are introduced through the normally open time contact of the time relay At the same time, the normally open contact of the trip relay and the high-voltage circuit breaker are connected to form a circuit; when the three-phase opening and closing states of the high-voltage circuit breaker are not synchronized, the starting circuit is automatically connected, and the time relay is energized and delayed to start to close the normally open contact of the trip relay. , to achieve three-phase tripping of high-voltage circuit breakers. By implementing the invention, the three-phase inconsistency protection circuit of the high-voltage circuit breaker body is improved, the reliability of the protection action is improved, and misoperation and refusal to operate during operation are prevented.

Description

A high-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure

technical field

The invention relates to the technical field of relay protection, in particular to a secondary circuit structure for three-phase inconsistency protection of a high-voltage circuit breaker body.

Background technique

As shown in Figure 1, in the secondary circuit of the three-phase inconsistency protection of the high-voltage circuit breaker body, the circuit breaker normally closed auxiliary contacts DLA~DLC are connected in parallel and the normally open auxiliary contacts DLa~DLc are connected in parallel, and then the circuit breaker is connected in series to form a three-phase inconsistency. Start the circuit. During normal operation, all three phases of the circuit breaker are in the closed or open state, and only one of the normally open auxiliary contacts DLA~DLC or normally closed auxiliary contacts DLa~DLc of the circuit breaker is in the open state. At this time, the three-phase inconsistent starting circuit When it is disconnected, the positive power +KM of the control power supply is cut off, so that the SJ coil of the three-phase inconsistency protection delay relay is in a power-off state, and its normally open delay contacts 15-18 are in a disconnected state. Only when the three-phase state of the circuit breaker is inconsistent, the three-phase inconsistent starting circuit composed of the normally open auxiliary contact and the normally closed auxiliary contact of the circuit breaker is connected, and the positive power of the control power supply + KM is added to the positive power end of the SJ coil of the delay relay. Only after the coil is energized and excited, it is further led to the SZJ coil of the outlet intermediate relay, so that the excitation action of the outlet intermediate relay SZJ trips the three-phase circuit breaker.

However, due to the different models and quality levels of the selected delay relay SJ and the intermediate relay SZJ, and the delay relay SJ and the intermediate relay SZJ are installed in the circuit breaker control box with the primary equipment, the operation is faced with high temperature and humidity. , Large mechanical vibration, strong electromagnetic interference and other harsh environmental factors, resulting in poor operation reliability of the delay relay SJ and the port intermediate relay SZJ. In actual operation, compared with environmental factors, factors such as electrical wear and mechanical wear have little effect on the reliability of the delay relay SJ and the intermediate relay SZJ, and can be ignored in the analysis.

A large number of statistical data show that line faults account for about 90% of short-circuit faults in high-voltage power grids, while single-phase grounding faults account for about 90% of line faults. When a single-phase instantaneous ground fault occurs in a line of 220kV and above, when the protection phase selection trips or a certain phase of the circuit breaker trips stealthily under normal operation, the reclosing action in 0.8 seconds under normal circumstances closes the tripped phase circuit breaker, and the line recovers. normal operation.

The actual operation shows that the three-phase inconsistency protection of the high-voltage circuit breaker body in Figure 1 may cause the time relay SJ delay to be shortened or the time relay SJ normally open delay contacts 15-18 to be abnormally turned on due to the harsh operating environment. The circuit breaker is in a three-phase inconsistent state after phase selection and tripping. The three-phase inconsistent protection will trip the three-phase circuit breaker before the reclosing action, causing the recloser to discharge, causing the circuit breaker to lose the opportunity to reclose, and even lead to two interconnections. It is extremely unreasonable to delist the regional power grid. At the same time, the three-phase inconsistency protection of the high-voltage circuit breaker body in Figure 1 may also cause the delay relay SJ to become longer due to the harsh operating environment, or the time relay SJ may be damaged due to coil damage, which makes the normally open delay contacts 15-18 blocked. , or may also cause damage to the SZJ coil of the outlet intermediate relay and its corresponding normally open contacts, resulting in failure to operate reliably when the three-phase inconsistent protection action of the circuit breaker is required, which will cause zero sequence overcurrent backup of adjacent lines or main transformer protection devices. The protection is overstepped and tripped to expand the scope of power outages.

SUMMARY OF THE INVENTION

The technical problem to be solved by the embodiments of the present invention is to provide a secondary circuit structure for the three-phase inconsistency protection of the high-voltage circuit breaker body, improve the three-phase inconsistency protection circuit of the high-voltage circuit breaker body, and effectively solve the problem of the high-voltage circuit breaker body in the prior art. The problems existing in the three-phase inconsistent protection circuit can improve the reliability of the protection action and prevent misoperation and refusal to operate during operation.

In order to solve the above technical problems, the embodiment of the present invention provides a three-phase inconsistent protection secondary circuit structure of a high-voltage circuit breaker body, including a three-phase inconsistent starting circuit of the high-voltage circuit breaker disposed in the circuit breaker control box, and a three-phase inconsistent starting circuit disposed in the relay protection room. The time relay in the protection screen and the trip relay preset on the trip relay circuit in the circuit breaker operation box of the protection screen in the relay protection room; among them,

The input end of the three-phase inconsistent starting circuit of the high-voltage circuit breaker is connected to the positive power of the preset control power supply, one output end is connected to the positive power end of the coil of the time relay, and the other output end is connected to the normally open of the time relay. One end of the time junction is connected;

The negative terminal of the coil of the time relay is connected to the negative terminal of the preset control power supply, and the other end of the normally open time contact is connected to the positive terminal of the coil of the trip relay;

The coil negative terminal of the trip relay is connected to the negative power of the preset control power supply, and the normally open contact is connected to the high-voltage circuit breaker in the circuit breaker control box to form a loop;

Among them, when the three-phase opening and closing states of the high-voltage circuit breaker are not synchronized, the three-phase inconsistent starting circuit of the high-voltage circuit breaker is automatically connected, so that the time relay is energized and delayed to start, and the normally open time contact of the time relay is closed. to drive the normally open contact of the trip relay to close, so as to realize the three-phase tripping of the high-voltage circuit breaker.

Wherein, there are two normally open time contacts of the time relay, and the two normally open time contacts of the time relay are connected together in series.

Wherein, there are three trip relays on the trip relay circuit, and the three trip relays are connected in series.

The embodiment of the present invention also provides another secondary circuit structure for the three-phase inconsistency protection of the high-voltage circuit breaker body, including two protection branch structures connected in parallel, and the two protection branch structures both include a circuit breaker control structure. A three-phase inconsistent starting circuit of a high-voltage circuit breaker in the box, a time relay set in the protection screen of the relay protection room, and a trip relay preset on a trip relay circuit in the circuit breaker operation box of the protection screen of the relay protection room; among them,

In each protection branch structure, the input end of the three-phase inconsistent starting circuit of the high-voltage circuit breaker is connected with the positive power of a corresponding preset control power supply, and an output end is connected with the positive power end of the coil of the corresponding time relay, The other output end is connected to one end of the normally open time contact of the corresponding time relay;

In each protection branch structure, the negative end of the coil of the time relay is connected to the negative end of the corresponding preset control power supply, and the other end of the normally open time contact is connected to the positive end of the coil of the corresponding trip relay;

In each protection branch structure, the negative terminal of the coil of the trip relay is connected to the negative terminal of the corresponding preset control power supply, and the normally open contacts are connected to the high-voltage circuit breaker in the circuit breaker control box to form a circuit;

Among them, when the three-phase opening and closing states of the high-voltage circuit breaker are not synchronized, the three-phase inconsistent starting circuit of each high-voltage circuit breaker is automatically connected, so that each time relay is energized and delayed to start, so that the normally open time contact of each time relay is Both are closed to drive the normally open contacts of the corresponding trip relays to close, so as to realize the three-phase tripping of the high-voltage circuit breaker.

Wherein, each time relay has two normally open time contacts, and the two normally open time contacts in each time relay are connected in series correspondingly.

Wherein, there are three trip relays on each trip relay circuit, and the three trip relays on each trip relay circuit are connected together in series.

Implementing the embodiment of the present invention has the following beneficial effects:

1. The present invention breaks the long-standing traditional design of installing the components such as the delay relay for three-phase inconsistency protection of the high-voltage circuit breaker body operated by phase separation, the intermediate relay for outlet tripping, etc. in the local control cabinet, and proposes to install the components in the In the protection screen of the relay protection room, the advantages of temperature and humidity controllable, small mechanical vibration and weak electromagnetic interference in the relay protection room are fully utilized, which effectively improves the operating environment of components such as delay relays for three-phase inconsistency protection on the body, and improves the performance of the relay protection room. Component operation reliability;

2. For the first time, the present invention proposes to cancel the outlet trip intermediate relay for three-phase inconsistency protection of the high-voltage circuit breaker body, and directly connect the normally open contact of the delay relay to the trip relay circuit in the operation box of the circuit breaker on the protection screen of the relay protection room. Start the trip relay on the reclosing) to realize the design of the three-phase tripping function of the high-voltage circuit breaker, which not only simplifies the secondary circuit, but also helps to improve the reliability of the protection action;

3. In order to improve the reliability of the protection action, the present invention follows the dual design principle. The excitation coils of the two time relays are respectively connected to the three-phase inconsistent starting circuits of the two sets of high-voltage circuit breakers, and the two sets of normally open time contacts of each time relay are connected to each other. After being connected in series, the trip relays on the two trip relay circuits in the operation box of the protective screen circuit breaker of the relay protection room are respectively connected, which can effectively prevent the protection malfunction caused by the abnormal contact of a single relay and the protection refusal caused by the failure of one group of control power.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention, and for those of ordinary skill in the art, obtaining other drawings according to these drawings still belongs to the scope of the present invention without any creative effort.

Fig. 1 is the connection schematic diagram of the three-phase inconsistent protection secondary circuit of the high-voltage circuit breaker body in the prior art;

FIG. 2 is a schematic connection diagram of a secondary circuit structure for three-phase inconsistency protection of a high-voltage circuit breaker body according to Embodiment 1 of the present invention;

Figure 3 is a schematic diagram of the connection of the trip relay circuit in the operation box of the protective screen circuit breaker of the relay protection room corresponding to the trip relay in Figure 2;

4 is a schematic connection diagram of a secondary circuit structure for three-phase inconsistency protection of another high-voltage circuit breaker body according to Embodiment 2 of the present invention;

FIG. 5 is a schematic diagram of the connection of the trip relay circuit in the operation box of the protective screen circuit breaker of the relay protection room corresponding to the trip relay in FIG. 4 .

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

The inventor found that because the circuit breaker control box is often installed outdoors, the delay relay and the intermediate relay of the secondary circuit of the three-phase inconsistent protection of the high-voltage circuit breaker body in the existing circuit breaker control box are subject to high temperature, humidity and mechanical vibration. The influence of harsh environmental factors such as high electromagnetic interference and high electromagnetic interference is great, so that the three-phase inconsistent protection will trip the three-phase circuit breaker before the reclosing action, causing the reclosing discharge or the circuit breaker to refuse to operate under the condition of the three-phase inconsistent protection action. Therefore, the inventor improved the three-phase inconsistency protection circuit of the high-voltage circuit breaker body, and improved the relays and other components of the three-phase inconsistency protection secondary circuit of the high-voltage circuit breaker body in the circuit breaker control box into the protection screen of the relay protection room. It can effectively control the temperature, humidity and other problems of the working environment, and can effectively solve the problem of large mechanical vibration interference during the opening and closing operation of the circuit breaker.

As shown in FIG. 2 and FIG. 3 , in the first embodiment of the present invention, the inventor provides a three-phase inconsistency protection secondary circuit structure of a high-voltage circuit breaker body, including a three-phase high-voltage circuit breaker disposed in the circuit breaker control box Inconsistent starting circuit S1, time relay SJ1 set in the protection screen of the relay room, and trip relay 11TJF preset on the trip relay circuit TJF in the circuit breaker operation box of the protection screen of the relay room; it should be noted that the high-voltage circuit breaker three The phase-inconsistent starting circuit S1 is still composed of the existing circuit breaker normally closed auxiliary contacts DLA~DLC in parallel and normally open auxiliary contacts DLa~DLc in parallel and then connected in series. Both the time relay SJ1 and the trip relay 11TJF are improved to the protection screen of the relay room In addition, the trip relay 11TJF is existing in the protection panel of the relay protection room and does not need to be additionally installed; among them,

The input terminal of the three-phase inconsistent starting circuit S1 of the high-voltage circuit breaker is connected to the positive power 101 of the preset control power supply, one output terminal is connected to the positive terminal A1 of the coil of the time relay SJ1, and the other output terminal is connected to the normally open time of the time relay SJ1. One end of the contact (such as two normally open time contacts connected in series are SJ1-5 and SJ1-8, SJ1-15 and SJ1-18) are connected to one end; of course, the normally open time contact of the time relay SJ1 can be one ( Such as SJ1-5 and SJ1-8, or as SJ1-15 and SJ1-18);

The coil negative terminal A2 of the time relay SJ1 is connected to the negative power 102 of the preset control power supply. The other end of SJ1-18) is connected to the positive terminal A3 of the coil of the trip relay 11TJF;

The coil negative terminal A4 of the trip relay 11TJF is connected to the negative power 102 of the preset control power supply, and its normally open contact is connected to the high-voltage circuit breaker in the circuit breaker control box to form a loop (not shown);

Among them, when the three-phase opening and closing states of the high-voltage circuit breaker are not synchronized, the three-phase inconsistent starting circuit S1 of the high-voltage circuit breaker is automatically turned on, so that the time relay SJ1 is energized and delayed to start, so that the normally open time contact of the time relay SJ1 is closed (such as a series connection). The connected SJ1-5 and SJ1-8 and SJ1-15 and SJ1-18 are closed at the same time) to drive the normally open contact of the trip relay 11TJF to close, so as to realize the three-phase tripping of the high-voltage circuit breaker.

It can be understood that in Figure 3, there are three trip relays (such as 11TJF, 12TJF and 13TJF) on the TJF on the trip relay circuit, and the three trip relays (such as 11TJF, 12TJF and 13TJF) are connected in series to form a three-jump relay, When this type of relay operates, it can realize the three-phase tripping function at the same time without starting failure, and at the same time block the reclosing. At this time, as shown in Figure 3, the 4Q1D23 terminal is directly connected to the normally open time contact of the time relay SJ1.

The working principle of the secondary circuit structure for the three-phase inconsistency protection of the high-voltage circuit breaker body in the first embodiment of the present invention is that when the high-voltage circuit breaker is in the three-phase closed state, the three-phase inconsistency of the high-voltage circuit breaker starts the three-phase on the circuit S1. The normally closed auxiliary contacts DLA to DLC are disconnected; when the high-voltage circuit breaker is in the three-phase open state, the three-phase normally open auxiliary contacts DLa to DLc on the three-phase inconsistent starting circuit S1 of the high-voltage circuit breaker are disconnected. Under the above two normal conditions, the three-phase inconsistent starting circuit S1 of the high-voltage circuit breaker is normally disconnected, and the time relay SJ1 coil loses power, and the delay function is not activated.

However, when the three-phase inconsistent starting circuit S1 of the high-voltage circuit breaker is turned on, the positive power 101 of the control power supply is led to the A1 terminal of the time relay SJ1. At this time, the rated working voltage is applied to both ends of the time relay SJ1 coil, and the delay function is activated. After the time exceeds the set value, the normally open delay contacts SJ1-5 and SJ1-8, SJ1-15 and SJ1-18 are immediately closed and conducted, and the positive power 101 of the control power supply is led to the operation box of the circuit breaker of the relay protection room. The positive terminal A3 of the trip relay 11TJF on the trip relay circuit TJF, at this time, the rated working voltage is applied to both ends of the trip relay 11TJF coil, and its normally open contact is immediately closed, tripping the three-phase circuit breaker.

As shown in FIG. 4 and FIG. 5 , in the second embodiment of the present invention, another high-voltage circuit breaker body three-phase inconsistency protection secondary circuit structure provided by the inventor includes two parallel protection branch structures B1, B2, the two protection branch structures B1 and B2 both include a three-phase inconsistent starting circuit S1, S2 of a high-voltage circuit breaker set in the circuit breaker control box, a time relay SJ1, SJ2 set in the protection panel of the relay protection room, and The trip relays 11TJF and 21TJF are preset on a trip relay circuit in the circuit breaker operation box of the protection screen of the relay protection room; among them,

In each protection branch structure, the input end of the three-phase inconsistent starting circuit of the high-voltage circuit breaker is connected with the positive power of a corresponding preset control power supply, and an output end is connected with the positive power end of the coil of the corresponding time relay, The other output end is connected to one end of the normally open time contact of the corresponding time relay;

For example, the input end of the three-phase inconsistent starting circuit S1 of the high-voltage circuit breaker in the protection branch structure B1 is connected to the positive power 101 of the preset control power supply, one output end is connected to the positive power end A1 of the coil of the corresponding time relay SJ1, and the other An output terminal is connected to one end of the normally open time contact of the corresponding time relay SJ1 (for example, two normally open time contacts connected in series are SJ1-5 and SJ1-8, SJ1-15 and SJ1-18 respectively) one end is connected; of course , the normally open time contact of the time relay SJ1 can be one (such as SJ1-5 and SJ1-8, or such as SJ1-15 and SJ1-18);

The input end of the three-phase inconsistent starting circuit S2 of the high-voltage circuit breaker in the protection branch structure B2 is connected to the positive electricity 201 of the preset control power supply, one output end is connected to the positive electricity end A5 of the coil of the corresponding time relay SJ2, and the other output end is connected to the positive electricity end A5 of the coil of the corresponding time relay SJ2 The terminal is connected to one end of the normally open time contact of the corresponding time relay SJ2 (for example, two normally open time contacts connected in series are SJ2-5 and SJ2-8, SJ2-15 and SJ2-18 respectively) one end is connected; of course, the time The normally open time contact of relay SJ2 can be one (such as SJ2-5 and SJ2-8, or such as SJ2-15 and SJ2-18);

In each protection branch structure, the negative end of the coil of the time relay is connected to the negative end of the corresponding preset control power supply, and the other end of the normally open time contact is connected to the positive end of the coil of the corresponding trip relay;

For example, the coil negative terminal A2 of the time relay SJ1 in the protection branch structure B1 is connected to the negative power 102 of the corresponding preset control power supply, and the normally open time contacts (for example, two normally open time contacts connected in series are respectively SJ1 The other end of -5 and SJ1-8, SJ1-15 and SJ1-18) is connected with the coil positive terminal A3 of the corresponding trip relay 11TJF;

The coil negative terminal A6 of the time relay SJ2 in the protection branch structure B2 is connected to the negative power 202 of the corresponding preset control power supply, and the normally open time contacts (such as two normally open time contacts connected in series are SJ2-5 The other end of SJ2-8, SJ2-15 and SJ2-18) is connected to the coil positive terminal A7 of the corresponding trip relay 21TJF;

In each protection branch structure, the negative terminal of the coil of the trip relay is connected to the negative terminal of the corresponding preset control power supply, and the normally open contacts are connected to the high-voltage circuit breaker in the circuit breaker control box to form a circuit;

For example, the coil negative terminal A4 of the trip relay 11TJF in the protection branch structure B1 is connected to the negative power 102 of the corresponding preset control power supply, and the normally open contact is connected to the high-voltage circuit breaker in the circuit breaker control box to form a loop (not shown) ;

The coil negative terminal A8 of the trip relay 21TJF in the protection branch structure B2 is connected with the negative power 202 of the corresponding preset control power supply, and the normally open contact is connected with the high-voltage circuit breaker in the circuit breaker control box to form a loop (not shown);

Among them, when the three-phase opening and closing states of the high-voltage circuit breaker are not synchronized, the three-phase inconsistent starting circuits S1 and S2 of each high-voltage circuit breaker are automatically turned on, so that each time relay SJ1 and SJ2 are energized and delayed to start. The normally open time contacts of relays SJ1 and SJ2 (for example, two normally open time contacts connected in series are SJ1-5 and SJ1-8, SJ1-15 and SJ1-18, and two normally open time contacts connected in series. The time contacts are SJ2-5 and SJ2-8, SJ2-15 and SJ2-18) are closed to drive the normally open contacts of the corresponding trip relays 11TJF and 21TJF to close to realize the three-phase tripping of the high-voltage circuit breaker.

It can be understood that, in FIG. 5 , there are three trip relays of the TJF on each trip relay circuit, and the three trip relays are connected in series to form a three-trip relay. For example, there are three trip relays of TJF on one trip relay circuit (such as 11TJF, 12TJF and 13TJF), and there are three trip relays of TJF on the other trip relay circuit (such as 21TJF, 22TJF and 23TJF), and three trip relays (such as 11TJF, 12TJF, and 13TJF) are connected in series to form a three-trip relay, and three trip relays (such as 21TJF, 22TJF, and 23TJF) are connected in series to form a three-trip relay. When this type of relay operates, it can achieve three-phase simultaneous tripping function and Do not start failure, and lock the reclosing at the same time. At this time, as shown in Figure 5, the 4Q1D23 terminal is directly connected to the normally open time contact of the time relay SJ1, and the 4Q2D17 terminal is directly connected to the normally open time contact of the time relay SJ2.

It can be understood that the secondary circuit structure of the three-phase inconsistency protection of a high-voltage circuit breaker body in the second embodiment of the present invention follows the dual design principle, and the excitation coils of the two time relays SJ1 and SJ2 are respectively connected to two sets of high-voltage circuit breakers. For the three-phase inconsistent starting circuits S1 and S2, connect the two groups of normally open time contacts of each time relay SJ1 and SJ2 in series and then connect them to the trip relays 11TJF, 11TJF, 21TJF, which can effectively prevent the protection malfunction caused by the abnormality of a single relay contact and the protection refusal caused by one group of control power failures.

The working principle of the secondary circuit structure for the three-phase inconsistency protection of the high-voltage circuit breaker body in the second embodiment of the present invention is that when the high-voltage circuit breaker is in the three-phase closed state, the three-phase inconsistency of the high-voltage circuit breaker starts on the circuits S1 and S2. The three-phase normally closed auxiliary contacts DLA-DLC are disconnected; when the high-voltage circuit breaker is in the three-phase open state, the three-phase normally-open auxiliary contacts DLa-DLc on the three-phase inconsistent starting circuits S1 and S2 of the high-voltage circuit breaker are disconnected. Under the above two normal conditions, the three-phase inconsistent starting circuits S1 and S2 of the high-voltage circuit breaker are normally disconnected, and the coils of the time relays SJ1 and SJ2 are de-energized, and the delay function is not activated.

However, when the three-phase inconsistent starting circuits S1 and S2 of the high-voltage circuit breaker are connected, the positive powers 101 and 201 of the control power supply are respectively led to the A1 terminal of the time relay SJ1 and the A5 terminal of the time relay SJ2. At this time, the time relay SJ1 and the time relay Both ends of the relay SJ2 coil are applied with the rated working voltage, and the delay function is activated. After the time exceeds the set value, the normally open delay contacts SJ1-5 and SJ1-8, SJ1-15 and SJ1-18 of the time relay SJ1 and the time The normally open delay contacts SJ2-5 and SJ2-8, SJ2-15 and SJ2-18 of the relay SJ2 are immediately closed and conducted, and the positive power 101 and 201 of the control power supply are respectively led to the operation box of the circuit breaker of the relay protection room to trip. The positive terminal A3 of the trip relay 11TJF and the positive terminal A7 of the trip relay 21TJF on the relay circuit TJF. At this time, both ends of the coils of the trip relay 11TJF and the trip relay 21TJF are applied with rated working voltage, and their normally open contacts are immediately closed and tripped. three-phase device.

Implementing the embodiment of the present invention has the following beneficial effects:

1. The present invention breaks the long-standing traditional design of installing the components such as the delay relay for three-phase inconsistency protection of the high-voltage circuit breaker body operated by phase separation, the intermediate relay for outlet tripping, etc. in the local control cabinet, and proposes to install the components in the In the protection screen of the relay protection room, the advantages of temperature and humidity controllable, small mechanical vibration and weak electromagnetic interference in the relay protection room are fully utilized, which effectively improves the operating environment of components such as delay relays for three-phase inconsistency protection on the body, and improves the performance of the relay protection room. Component operation reliability;

2. For the first time, the present invention proposes to cancel the outlet trip intermediate relay for three-phase inconsistency protection of the high-voltage circuit breaker body, and directly connect the normally open contact of the delay relay to the trip relay circuit in the operation box of the circuit breaker on the protection screen of the relay protection room. Start the trip relay on the reclosing) to realize the design of the three-phase tripping function of the high-voltage circuit breaker, which not only simplifies the secondary circuit, but also helps to improve the reliability of the protection action;

3. In order to improve the reliability of the protection action, the present invention follows the dual design principle. The excitation coils of the two time relays are respectively connected to the three-phase inconsistent starting circuits of the two sets of high-voltage circuit breakers, and the two sets of normally open time contacts of each time relay are connected to each other. After being connected in series, the trip relays on the two trip relay circuits in the operation box of the protective screen circuit breaker of the relay protection room are respectively connected, which can effectively prevent the protection malfunction caused by the abnormal contact of a single relay and the protection refusal caused by the failure of one group of control power.

Those skilled in the art can understand that all or part of the steps in the methods of the above embodiments can be implemented by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage Media such as ROM/RAM, magnetic disk, optical disk, etc.

The above disclosures are only preferred embodiments of the present invention, and of course, the scope of the rights of the present invention cannot be limited by this. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims (6)

1. A high-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure is characterized by comprising a high-voltage circuit breaker three-phase inconsistent starting circuit arranged in a circuit breaker control box, a time relay arranged in a relay protection screen and a tripping relay arranged on a tripping relay circuit in a relay protection screen circuit breaker operation box in advance; wherein,

the input end of the high-voltage circuit breaker three-phase inconsistent starting loop is connected with the positive electricity of a preset control power supply, one output end of the high-voltage circuit breaker three-phase inconsistent starting loop is connected with the coil positive electricity end of the time relay, and the other output end of the high-voltage circuit breaker three-phase inconsistent starting loop is connected with one end of a normally open time contact of the time relay;

the negative end of a coil of the time relay is connected with the negative electricity of a preset control power supply, and the other end of a normally open time contact of the time relay is connected with the positive end of the coil of the tripping relay;

the negative electricity end of a coil of the tripping relay is connected with the negative electricity of the preset control power supply, and a normally open contact of the tripping relay is connected with a high-voltage circuit breaker in the circuit breaker control box to form a loop;

when the three-phase opening and closing states of the high-voltage circuit breaker are asynchronous, the three-phase inconsistent starting circuit of the high-voltage circuit breaker is automatically switched on, so that the time relay is electrified and started in a delayed mode, the normally open time contact of the time relay is closed to drive the normally open contact of the tripping relay to be closed, and the three-phase tripping of the high-voltage circuit breaker is realized.

2. The high-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure as claimed in claim 1, wherein there are two normally open time contacts of the time relay, and the two normally open time contacts of the time relay are connected in series.

3. The high voltage circuit breaker body three-phase inconsistent protection secondary circuit structure of claim 1, wherein there are three trip relays on the trip relay circuit, and the three trip relays are connected together in series.

4. A high-voltage circuit breaker body three-phase inconsistent protection secondary circuit structure is characterized by comprising two protection branch structures which are connected in parallel, wherein each protection branch structure comprises a high-voltage circuit breaker three-phase inconsistent starting circuit arranged in a circuit breaker control box, a time relay arranged in a relay protection screen and a tripping relay which is preset on a tripping relay circuit in a relay protection screen circuit breaker operation box; wherein,

in each protection branch structure, the input end of a three-phase inconsistent starting circuit of the high-voltage circuit breaker is connected with the positive electricity of a corresponding preset control power supply, one output end of the high-voltage inconsistent starting circuit is connected with the positive electricity end of a coil of a corresponding time relay, and the other output end of the high-voltage inconsistent starting circuit is connected with one end of a normally open time contact of the corresponding time relay;

in each protection branch structure, the negative end of a coil of a time relay is connected with the negative electricity of a corresponding preset control power supply, and the other end of a normally open time contact is connected with the positive end of the coil of the corresponding trip relay;

in each protection branch structure, the negative electricity end of a coil of a tripping relay is connected with the negative electricity of a corresponding preset control power supply, and normally open contacts are connected with a high-voltage circuit breaker in a circuit breaker control box to form a loop;

when the three-phase opening and closing states of the high-voltage circuit breakers are asynchronous, each three-phase inconsistent starting circuit of each high-voltage circuit breaker is automatically switched on, each time relay is enabled to be powered on and started in a delayed mode, the normally open time contact of each time relay is enabled to be closed to drive the normally open contact of the corresponding tripping relay to be closed, and three-phase tripping of the high-voltage circuit breakers is achieved.

5. The three-phase inconsistent protection secondary circuit structure of high-voltage circuit breaker body as claimed in claim 4, wherein there are two normally open time contacts of each time relay, and the two normally open time contacts of each time relay are correspondingly connected in series.

6. The high voltage circuit breaker body three phase inconsistent protection secondary circuit structure of claim 4 wherein there are three trip relays on each trip relay loop and three trip relays on each trip relay loop are connected together in series.

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