KR200217316Y1 - Breaker emergency tripping device using supervisory control and data acquisition - Google Patents

Abstract

The present invention relates to an emergency trip device. Specifically, the circuit breaker for a distribution line of an unmanned substation is unable to detect a failure and shut down, so that a tripped circuit breaker can be restarted so that power supply to the bank can be resumed quickly in case of a power failure. A breaker emergency trip device via SCADA (Supervisory Control and Data Acquisition).

Conventionally, the feeder operator is implemented by SCADA, which delays the resumption of supply of sound lines due to the transfer of buses when switching unmanned substation buses with the SCADA system.In addition, the uncertainty of opening and input of LS in outdoor steel-type unmanned substations is delayed. There is a problem that causes the secondary failure remains.

The emergency trip device according to the present invention can shorten the recovery time of the power line, improve the reliability of power supply by preventing secondary accidents due to equipment defects in advance, and apply it to the emergency trip of various circuit breakers with over high pressure. It is possible to respond quickly to various emergencies.

In addition, the starter having a solenoid and a pulling wire as a basic configuration is installed in various valves that can be opened and closed by a short stroke such as a ball valve, and thus can be applied to emergency injection and opening.

Description

Breaker emergency tripping device using supervisory control and data acquisition

The present invention relates to an emergency trip device. Specifically, the circuit breaker for a distribution line of an unmanned substation is unable to detect a failure and shut down, so that a tripped circuit breaker can be restarted so that power supply to the bank can be resumed quickly in case of a power failure. A breaker emergency trip device via Supervisory Control and Data Acquisition (SCADA).

In general, a circuit breaker is a device that can open and close a circuit in a short-circuit state. It is an overcurrent protection device applying battery action and bimetal bending action. It is used to protect electric wires and mechanical devices, and protects against overload current and short circuit current. There is this.

Therefore, when the circuit breaker is disabled in the substation, a wide range power failure may occur. If a quick action is not taken, a long power outage may occur.

1 is a diagram illustrating a simplified disconnection diagram of a transformer secondary side of a power substation in the related art.

The secondary side of the distribution substation consists of a double bus bar to supply power to the distribution line (D / L). If power failure occurs in transformer bank No.2 due to the failure of Bus No. 12 in operation, the power supply must be restarted immediately after switching to Bus No. 11 on the opposite side. Only trips are made to prevent supply disruptions to the remaining healthy distribution lines.

In a typical double bus system, the case where the transfer operation is performed when the D / L breaker is not tripped will be described as an example.

If a permanent accident 13 occurs in transformer bank 'G' D / L 16, the 'G' circuit breaker 14 should be tripped. However, when the 'G' circuit breaker 14 is unable to perform a switching operation for diagnosis and blocking due to a failure of the trip system, the integrated circuit breaker 15 on the power supply side is tripped. Therefore, there is a problem that the power outage extends to the healthy 'H' (17) ~ 'L' D / L (18).

Figure 2 shows a simplified disconnected drawing after load transfer in the past, in order to resume the supply of the healthy lines 'H' (17) to 'L' D / L (18) 'G' D / L is a permanent failure All buses LS 23-24 should be opened after the bus switching operation except (16), and then all buses LS 21-22 should be inserted. This operation is carried out by SCADA operator. When switching unmanned substation bus by SCADA system, supply restart time of sound line is delayed. Also, in case of outdoor unmanned substation, second operation is performed according to uncertainty of opening and input of LS. There is a problem that causes a failure factor.

For example, if one of the three phases cannot be opened due to a poor mechanical link of the 'H2' LS (24) and is in the closed state, the total circuit breaker 15 of the transformer No. 2 will trip again when the supply resumes after bus transfer. Because of the inability to determine the site situation of unmanned substations, long-term power outages are inevitable. In addition, when the 'H1' LS 22 is inaccurately input, overheating of the main contact portion may occur due to a poor contact, and in this case, a second failure may be caused.

On the other hand, a method of separating the permanent accident point 13 of the D / L from the system by opening the 'G2' (25) or 'G1' LS (26) without switching the bus, but it is impossible. The reason is that there is an interlock circuit between the breaker and the related LS, so that the 'G2' 25 or the 'G1' LS 26 cannot be opened when the 'G7' breaker 14 is not opened. Because of this.

3 illustrates a trip system of a circuit breaker that is conventionally used. When an accident occurs in a distribution line, a protection relay operates and a trip signal is applied to the trip coil 36 of the breaker by a contact 34 of the protection relay. Is tripped immediately.

On the other hand, when the breaker is turned off due to the need for an armistice operation, it is possible to operate at three points of the inlet breaker 35, the switchboard 33 and the SCADA 31 for the distribution line. If a breakdown occurs due to breakage of the breaker trip coil 36 or a failure of the auxiliary contact 37, the breaker is incapable of tripping. In this case, when the line accident 13 occurs, the power supply side breaker 15 trips. The power outage range is extended and the resumption of supply of healthy lines is delayed.

The present invention has been devised to solve the above problems, by installing additionally in the space of the hydraulic circuit breaker or vacuum circuit breaker for the distribution line to remotely trip the breaker that is not tripped by SCADA to make an emergency trip to the emergency line of the distribution line The purpose of this is to provide a breaker emergency trip device using a SCADA that shortens the outage time by resuming the power supply to the power line with the existing bus, without disconnecting the bus.

1 is a simplified disconnection diagram of a transformer secondary side of a substation for a power distribution;

2 is a simplified disconnected diagram after load transfer.

Figure 3 is a trip system diagram before installing the emergency trip device in the prior art.

Figure 4 is a simplified disconnected drawing after load transfer according to the present invention.

Figure 5 is a trip system diagram after installing the emergency trip device according to the present invention.

6 is a partial view of a trip device diagram of a conventional inlet breaker for a distribution line.

Figure 7 is a trip device diagram of an inlet breaker to which an emergency trip device according to the present invention is added.

Figure 8 is an appearance and dimensions showing an example of the manufacture of the emergency trip device of the present invention.

Figure 9 is a photograph mounted on the appearance and breaker of the prototype produced by the present invention.

<Description of main parts of drawing>

11: No. 1 bus of transformer secondary side of substation 15: Transformer secondary breaker

17: Sound 'H' distribution line 18: Sound 'L' distribution line

21: Transformer secondary overall LS1 22: Sound 'H'D / L bus 1 LS

23: Transformer 2nd overall LS2 24: Sound 'H'D / L No.2 busbar LS

31: Host computer for SCADA 32: Remote Terminal Unit (RTU)

33: Control panel 34: Trip contact of protective relay

35: inlet breaker for distribution line 36: trip coil of breaker

37: auxiliary contact of breaker 41: power relay of RTU

42: auxiliary relay for emergency trip device 43: auxiliary auxiliary relay for emergency trip device

44: Solenoid for emergency trip 45: Aux Contact of breaker

46: Solenoid Plunger 47: Right Angle Lever

48: Pulling Wire 49: Trip lever of inlet breaker

50: trip hook of inlet breaker 51: emergency trip rod of inlet breaker

52: spring for returning the pulling wire

Features of the present invention for achieving the object as described above, when a signal for emergency trip of the circuit breaker is transmitted, a solenoid for generating an electromagnetic force for the emergency trip, a power transmission lever for transmitting power, and the power transmission lever It includes a pulling wire for performing a trip operation with the power received from.

In addition, the present invention is characterized in that the solenoid pulls the plunger for the emergency trip by generating an electromagnetic force, the power transmission lever is characterized in that consisting of a predetermined steel plate.

Hereinafter, with reference to the accompanying drawings, an embodiment according to the present invention in detail as follows.

4 is a simple disconnection after load transfer according to the present invention, by using a circuit breaker emergency trip device to disconnect the 'G' circuit breaker 14 that is not tripped with SCADA to isolate the permanent accident point 13 of the distribution line and the bus It is to quickly resume the supply of power to the health line (17-18) to the second bus (12) in operation without switching.

Figure 5 is a trip system diagram after installing the emergency trip device according to the present invention, in order to drive the trip lever of the breaker trip coil 36, or separate from the trip system by the manual emergency trip rod 51 SCADA ( By installing an emergency trip device operated by 31), the line accident point 16 is immediately disconnected from the power system and the power supply is quickly resumed.

The emergency trip device receives the emergency trip signal from the RTU power relay 41 of the SCADA 31, the solenoid 44 generating a driving force, the pulling wire 48 that pulls the trip lever 49 of the breaker, and the pulling wire 48 directly. ) Consists of a right angle lever 47 and an accessory for transmitting a driving force of the solenoid 44.

Fig. 6 shows a part of the trip mechanism of the inlet breaker. The breaker trip can be performed by operating the trip coil 36 or pulling the rod 51 for manual emergency trip. However, breakers with a faulty electrical trip system must be turned off by the inspector at the unmanned substation site.

On the other hand, when the power failure occurs due to the breaker of the breaker will be described the sequence operation of the emergency trip device for tripping the tripped breaker in order to resume the power supply quickly.

In response to the emergency trip command of the dispatcher operator, the RTU 32 of the unmanned substation sends an emergency trip signal from the RTU power relay 41 to the auxiliary relay 42 for the emergency trip device of the breaker, and the auxiliary relay receiving the emergency trip signal is The emergency trip solenoid 44 is operated through the relay auxiliary contact 43 for the emergency trip device, and the solenoid 44 pulls the solenoid plunger 46 with a strong electromagnetic force and the solenoid plunger 46 is a right angle lever with a hammer action. Price 47. The right angle lever 47 pulls the pulling wire 48 with the force, and the trip lever 49 of the inlet breaker connected to the end of the pulling wire 48 is a trip hook of the inlet breaker that serves as a kind of trigger for the breaker trip. Stripping 50 causes breaker trip link operation.

As the auxiliary contact 45 of the circuit breaker which has been tripped is opened, the emergency trip solenoid 44 is also released, and the solenoid plunger (by the spring 52 for returning the pulling wire built in the emergency trip solenoid 44) is released. 46) return.

On the other hand, by releasing the tripping lever 49 of the hydraulic circuit breaker by the force of the pulled wire returning spring 52 attached to the end of the pulling wire 48, the breaker returns to the closing ready state.

Figure 8 shows the specifications of the prototype emergency trip device for inlet breaker according to the present invention and the specifications are as follows.

The solenoid coil is made of φ0.7mm enameled copper wire, the number of turns is 2700 times, the coil resistance is 9Ω, the coil rating is DC 125V, 6.6A, the plunger stroke is 29mm, the solenoid frame is steel plate (8S41) 3.2mm, preservation relay is coil DC 125V, contact DC125V 10A, right angle lever is 8mm of general structural steel plate (steel plate connection part: 1.6mm), pulling wire is 1.25mm ^{2 of} stranded wire, and frame for component installation consists of 3.2mm of general structural steel plate do.

Figure 9 is a picture taken in the state installed in the inlet breaker for the prototype and distribution line according to the present invention.

As described above, the emergency trip device has a sufficient availability of the pulling wire, so it is possible to transmit the driving force of the solenoid by simply connecting the pulling wire and the breaker's trip lever regardless of the position and shape of the breaker's trip lever. The control of various circuit breakers over high voltage can be applied regardless of the type of circuit breaker such as emergency trip operation.

In addition, the emergency trip device can be installed in the empty space of the inlet breaker without affecting the conventional device, and can also be applied to the vacuum breaker, in which case the solenoid can be further miniaturized than in the case of the inlet breaker.

In addition, the embodiment according to the present invention is not limited to the above, and those skilled in the art with respect to the present invention will be able to carry out various modifications and changes to the present invention within the obvious scope, such modifications, And changes are intended to fall within the technical scope of the present invention.

As described above, the emergency trip device according to the present invention can shorten the recovery time of the power line, improve the reliability of power supply by preventing secondary accidents due to equipment defects in advance, and the emergency trip of various circuit breakers of special high pressure or higher. Since it can be applied, there is an effect that can respond quickly to various emergencies.

In addition, the starter having a solenoid and a pulling wire as a basic configuration is installed in various valves that can be opened and closed by a short stroke such as a ball valve, and thus can be applied to emergency injection and opening.

Claims (5)

When signal for emergency trip of breaker is transmitted, Skada breaker emergency trip device comprising a solenoid for generating an electromagnetic force for emergency trip, a power transmission lever for transmitting power, and a pulling wire for performing a trip operation with the power received from the power transmission lever. . The method of claim 1, The solenoid generates an electromagnetic force to pull the plunger for the emergency trip, characterized in that the breaker emergency trip device by the scanner. The method of claim 1, The breaker emergency trip device by the scan, characterized in that the power transmission lever is composed of a predetermined steel plate. The method of claim 1, The pull wire is a breaker emergency trip device by the skater, characterized in that for operating the trip lever for the trip operation by the force received from the power transmission lever. The method of claim 4 The trip lever is a circuit breaker emergency trip device characterized in that the emergency trip operation of the breaker by operating a trip hook that has a trigger function.