TW201603084A - Commutation type DC breaker and monitoring method of the same - Google Patents

Abstract

Even if accidents, problems, etc. occur, the present invention can still detect the accident current resulted from the problem immediately, and isolate the accident current from a DC power source quickly to prevent the expansion of accidents. To solve the aforementioned problems, the commutation type DC breaker of the present invention is characterized by comprising: a commutation circuit constituted by connecting in series a commutation switch, a commutation capacitor, and a commutation circuit forming switch installed on the opposite side of said commutation switch and spaced from said commutation capacitor, and also connected to a main flip-flop in parallel; a measuring transformer connected to the commutation circuit to measure the voltage of said commutation capacitor; and a detection unit to detect the voltage variation of said commutation capacitor measured by said measuring transformer. According to the voltage variation of said commutation capacitor detected by said detection unit, the closed-circuit of said commutation switch and said commutation circuit forming switch, which discharges the charges of said commutation capacitor, is monitored.

Description

Reversing DC circuit breaker and monitoring method thereof

The present invention is a commutating DC circuit breaker and a monitoring method thereof, and particularly relates to a current zero which is suitable for circulating the electric charge accumulated in the commutating capacitor toward the reverse direction of the main circuit current to open and close the main current. Reversing DC circuit breaker with open circuit and its monitoring method.

As a conventional commutating DC circuit breaker, there are those described in Patent Documents 1 and 2. Patent Document 1 and 2 disclose that a commutating DC circuit breaker includes: a main switch; and a sub-closer connected in series to the main switch; and a series circuit including a commutation capacitor and a commutation switch And a commutation circuit connected in parallel with the main switch; and a capacitor charging device for charging the reversing capacitor; and a commutating circuit formed on the opposite side of the reversing switch via the commutating capacitor switch.

[Advanced technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2010-192305

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2010-287460

However, in the above-mentioned commutating DC circuit breaker, when a large current flows through the DC circuit, the commutation current is energized to generate a zero value, so that the switch is formed by the commutation switch and the commutation circuit. The main circuit and the commutation circuit are connected in a sexual manner. However, when the switches cannot be closed due to an accident or the like, the failure of the accident current may not be immediately known, which may affect other machines.

The present invention has been made in view of the above problems, and an object thereof is to provide a commutating DC circuit breaker and a monitoring method thereof capable of immediately breaking an accident current to prevent an accident from spreading even in the event of an accident or the like.

In order to achieve the above object, a commutating DC circuit breaker according to the present invention includes: a main switch, which is inserted in series in a main circuit that connects a DC power supply and a load; and a sub-opener that is connected in series to the main switch; And a commutation circuit, wherein the commutation switch and the commutating capacitor and the commutating circuit forming switch provided on the opposite side of the reversing switch via the shunting capacitor are connected in series, and are connected in parallel to the main opening and closing And a capacitor charging device for accumulating charges in the switching capacitor; and a measuring transformer connected to the switching circuit to measure a voltage of the switching capacitor; and a detecting unit for detecting the measured transformer The voltage fluctuation of the switching capacitor is monitored, and the commutation capacitor is monitored based on a voltage fluctuation of the switching capacitor detected by the detecting unit The aforementioned commutation switch that discharges the charged charge in the device and the commutating circuit form a closed circuit of the switch.

In order to achieve the above object, the monitoring method of the commutating DC circuit breaker according to the present invention is characterized in that: the monitoring includes: a main switch, which is inserted in series in a main circuit that connects the DC power supply and the load; and a sub-opener that is connected in series The main switch and the commutation circuit are composed of a commutating switch and a commutating capacitor and a commutating circuit formed on the opposite side of the reversing switch via the shunting capacitor, and the switches are connected in series, and are connected in parallel And a capacitor charging device that stores charge in the switching capacitor; and a measuring transformer connected to the switching circuit to measure a voltage of the switching capacitor; and a detecting unit that detects the measurement In the case of the commutating DC circuit breaker, the voltage of the switching capacitor is measured by the transformer, and the commutation capacitor is monitored based on the voltage fluctuation of the switching capacitor detected by the detecting unit. The aforementioned commutation switch that discharges the charged electric charge and the commutating circuit form a closed circuit of the switch.

According to the present invention, even if an accident or the like occurs, the accident current caused by the problem can be immediately detected, and the accident current can be quickly isolated from the DC power source, and the accident can be prevented from spreading.

1‧‧‧ main circuit

1a‧‧‧Main circuit current

2‧‧‧ commutation circuit

2a‧‧‧ commutation current

3‧‧‧Main switch

4‧‧‧Sub-opener

5‧‧‧Reversing switch

5a‧‧‧Commutation circuit forming switch

6‧‧‧Reversing capacitors

7‧‧‧ Energy absorbing nonlinear resistor

8‧‧‧Saturation reactor

9‧‧‧DC power supply

10‧‧‧ load

11‧‧‧Capacitor charging device

12‧‧‧ Current Detector

13‧‧‧Drive command device

14‧‧‧Reversing DC Circuit Breaker

15‧‧‧Measurement transformer

16‧‧‧Detection unit

17‧‧‧Monitor

1 is a view showing the straightness of Embodiment 1 of the commutating DC circuit breaker of the present invention The circuit configuration diagram of the flow circuit.

Fig. 2 is a flow chart for explaining the monitoring method of the commutating DC circuit breaker of the present invention.

Hereinafter, the commutating DC circuit breaker of the present invention and its monitoring method will be described based on the illustrated embodiment.

[Example 1]

Fig. 1 shows the circuit configuration of a direct current circuit in the first embodiment of the commutating DC circuit breaker of the present invention.

As shown in the figure, the commutating DC circuit breaker 14 of the present embodiment is roughly constituted by the main switch 3, which is inserted in series into the main circuit 1 that connects the DC power source 9 and the load 10; The switch 4 is connected in series to the main switch 3; and the saturable reactor 8 is connected between the main switch 3 and the sub-opener 4; and the energy absorbing nonlinear resistor 7 is saturated with respect to the main switch 3 The series circuit of the reactor 8 is connected in parallel; and the current detector 12 detects the overcurrent of the main circuit 1; and the drive command device 13, as shown by the dotted arrow in Fig. 1, respectively, opens and closes the main switch 3, The switch 4, the changeover switch 5, and the commutation circuit forming switch 5a issue an opening and closing command; and the commutation circuit 2, which is provided by the changeover switch 5 and the commutation capacitor 6 and the commutation switch 6 via the commutation switch 6 The switching circuit 5a on the opposite side is formed by connecting the switches 5a in series, and is connected in parallel to the main switch 3; and the capacitor charging device 11 accumulates electric charge in the commutating capacitor 6 (The commutation capacitor 6 is charged in advance by the capacitor charging device 11 The transformer 15 is connected to the commutation circuit 2 to measure the voltage of the commutation capacitor 6; and the detecting unit 16 detects the commutation measured by the measuring transformer 15 The voltage fluctuation of the capacitor 6 and the monitoring device 17 display the commutation switch 5 and the commutation circuit forming switch 5a in a closed circuit (point arc failure) based on the signal detected by the detecting unit 16, and issue an alarm.

Next, a general circuit breaking principle in the case where an accident occurs in the main circuit 1 and the current detector 12 detects an overcurrent, and a commutating DC in the case where the disconnection fails in the first embodiment of the present invention will be described with reference to FIGS. 1 and 2. Circuit breaker monitoring method.

In the step (A) of Fig. 2, when a large current (main circuit accident) flows through the DC circuit, an overcurrent is detected by the current detector 12 in the step (B). The detection of the overcurrent causes the drive command device 13 to issue an instruction. When the current of the main circuit 1 is disconnected based on this, the switch is normally turned on in the step (D) immediately after the main switch 3 is opened. 5 and the commutating circuit forming switch 5a is arced to form the commutating capacitor 6, the commutating switch 5, the main switch 3, the commutating circuit 2 of the saturable reactor 8, and the commutating capacitor in the step (E) 6 is discharged and the capacitor voltage is lowered. With the discharge of the commutation capacitor 6, the commutation current 2a flows in the opposite direction to the main circuit current 1a. The commutation current 2a is overlapped to the main circuit current 1a. When the current of the main switch 3 reaches zero, the main switch 3 is arc-extinguished in step (F) and the commutating DC circuit breaker 14 is opened, whereby the step The accident current in (L) is broken.

In addition, when the changeover switch 5 and the commutation circuit forming switch 5a are not arced by the command of the drive command device 13, it is conventional that the accident current cannot be broken and the commutating DC circuit breaker 14 is damaged, and then By interlocking to open the circuit breakers that are not normally open in order to disconnect the accident current, it takes time to break the accident current, and the accident may spread and cause the problematic commutating DC circuit breaker 14 to be the entire substation. burn.

For this reason, in the present embodiment, the drive command device 13 is commanded in the step (D) in accordance with the open command of the commutating DC circuit breaker 14 in the step (C), so that the commutation switch 5 and the commutation circuit are formed. Switch 5a is arced (opened and closed) to monitor whether it has failed.

In the monitoring method, the voltage of the commutation capacitor 6 is measured by the measuring transformer 15 which is the measuring unit in the step (G), and the detecting unit 16 detects that the voltage of the measured switching capacitor 6 has not changed ( Voltage variation), that is, when the commutation current 2a is not energized in the commutation circuit 2, it is judged that the commutation switch 5 and the commutation circuit form the switch 5a to fail the arc, and it is detected in step (H) by energizing the auxiliary relay. Abnormality, in the step (I), the operation of the auxiliary relay contact is transmitted to the monitoring device 17 that confirms the abnormality or state of the substation and operates the machine to issue an alarm (buzzer, etc.) and display it. Thereafter, an open command is given to the connected circuit breaker in step (J), in which the circuit breaker is opened and the accident current is disconnected (step (L) of Fig. 2).

By the alarm and display of the monitoring device 17, the manager of the monitoring device 17 can know the abnormality and open the accident current by issuing an open command from the monitoring device 17 to when there is a problem with the commutating DC circuit breaker 14. The higher-voltage upper-level circuit breaker of the substation and the feeder circuit breaker of the other circuit of the substation can immediately disconnect the accident current.

According to this embodiment, even if an accident or the like occurs, the accident current caused by the problem can be immediately detected, and the accident current can be quickly isolated from the DC power source, and the accident can be prevented from spreading, so that the victim is not enlarged. To the entire substation, the damage can be minimized to prevent accidents.

Further, the present invention is not limited to the above embodiment, and various modifications are also included. For example, the above-described embodiments are described in detail in order to facilitate understanding of the embodiments of the present invention, and are not necessarily limited to all of the configurations described. Further, a part of the configuration of a certain embodiment may be replaced with a configuration of another embodiment, and a configuration of another embodiment may be added to the configuration of a certain embodiment. Further, a part of the configuration of each embodiment may be added, deleted, or replaced with another configuration.

1‧‧‧ main circuit

1a‧‧‧Main circuit current

2‧‧‧ commutation circuit

2a‧‧‧ commutation current

3‧‧‧Main switch

4‧‧‧Sub-opener

5‧‧‧Reversing switch

5a‧‧‧Commutation circuit forming switch

6‧‧‧Reversing capacitors

7‧‧‧ Energy absorbing nonlinear resistor

8‧‧‧Saturation reactor

9‧‧‧DC power supply

10‧‧‧ load

11‧‧‧Capacitor charging device

12‧‧‧ Current Detector

13‧‧‧Drive command device

14‧‧‧Reversing DC Circuit Breaker

15‧‧‧Measurement transformer

16‧‧‧Detection unit

17‧‧‧Monitor

Claims (9)

A reversing type DC circuit breaker, comprising: a main switch, which is inserted in series in a main circuit connected to a DC power supply and a load; and a sub-opener connected in series to the main switch; and a commutation circuit a switching circuit and a switching capacitor and a switching circuit formed on the opposite side of the switching switch via the switching capacitor are connected in series, and are connected in parallel to the main switch; and a capacitor charging device. And accumulating charge in the switching capacitor; and measuring transformer connected to the switching circuit to measure a voltage of the switching capacitor; and detecting means for detecting the switching capacitor measured by the measuring transformer The voltage fluctuation is monitored by the voltage change of the switching capacitor detected by the detecting unit, and the switching of the switching switch and the switching circuit forming switch that discharges the electric charge charged in the switching capacitor. The reversing type DC circuit breaker according to the first aspect of the invention, wherein the detecting unit detects that the voltage of the reversing capacitor does not change, determining that the reversing switch and the commutating circuit form a switch For closed circuit. The reversing type DC circuit breaker according to claim 2, wherein the detecting unit detects that the voltage of the reversing capacitor does not fluctuate and that the commutating current is not energized in the commutating circuit, The commutating switch and the commutating circuit forming switch are closed. The reversing type DC circuit breaker according to claim 2 or 3, further comprising: a monitoring device, wherein the reversing switch and the commutating circuit forming switch are displayed according to the signal detected by the detecting unit Closed state and an alarm is issued. A monitoring method for a commutating DC circuit breaker, characterized in that: when the monitoring comprises: a main switch, the main circuit is connected in series to the DC power supply and the load; and the sub-opener is connected in series to the main switch; a circuit, wherein the commutation switch and the commutating capacitor and the commutating circuit forming switch provided on the opposite side of the reversing switch are connected in series via the shunting capacitor, and are connected in parallel to the main switch; And a capacitor charging device that stores charge in the switching capacitor; and a measuring transformer connected to the switching circuit to measure a voltage of the switching capacitor; and a detecting unit that detects the aforementioned measured by the measuring transformer In the case of the commutating DC circuit breaker, the electric charge charged in the reversing capacitor is discharged according to the voltage fluctuation of the reversing capacitor detected by the detecting unit. The reversing switch and the commutating circuit form a closed circuit of the switch. The method of monitoring a commutating DC circuit breaker according to claim 5, wherein the detecting means detects that the voltage of the switching capacitor does not change, and determines the switching switch and the commutation The circuit forming switch is closed. Reversing DC circuit breaker as described in claim 6 In the monitoring method, when the detecting unit detects that the voltage of the switching capacitor does not change and that no commutation current is energized in the switching circuit, it is determined that the switching switch and the switching circuit forming switch are closed . The method for monitoring a commutating DC circuit breaker according to the sixth or seventh aspect of the invention, wherein the switching switch and the commutating circuit forming switch are in a closed state according to the signal detected by the detecting unit. The situation is displayed on the monitoring device and an alarm is issued. The method of monitoring a commutating DC circuit breaker according to claim 8, wherein the commutating DC circuit breaker is used in accordance with the detection of a decrease in a charging voltage of the switching capacitor by the detecting unit. The accident current interruption failure is displayed to the monitoring device, and an open command is issued to open the circuit breaker on the upper side and the power supply side circuit breaker when the commutating DC circuit breaker fails.