JP2010272453A - Synchronization test system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synchronization test system for a breaker attaining high reliability and economical efficiency by controlling input of a plurality of breakers by one synchronization test device 700. <P>SOLUTION: The synchronization test system includes the plurality of breakers 110 from/with which a plurality of AC power systems can be respectively separated/connected, and one synchronization test device 700 for outputting a breaker input signal at a timing that an input command signal to the breaker 110, a voltage across the breaker 110 and a synchronization test start signal are input when one of the plurality of breakers 110 is input and the frequency and the phase of the voltage across the breaker 110 and the voltage are within predetermined set ranges. Synchronization test of the breaker into which the input command signal has been input at the earliest timing is performed by one synchronization test device 700 and start of the synchronization test device 700 by input of a breaker input signal from another line is blocked until an inputting operation of an object breaker is finished. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a synchronous verification system using a plurality of circuit breakers that separate and connect a plurality of AC power systems.

  In response to the overcrowding of cities and the rapid increase in power demand since the latter half of the 1960s, switchgears in substations have switched from air insulation to SF6 gas insulation, and the latter is the mainstream now. The SG6 gas insulated switchgear is called GIS (Gas Insulated Switchgear).

  In this power GIS circuit breaker switching control, the synchronous verification system that loads the circuit breaker when the voltage amplitude, phase, and frequency are within a certain setting range with reference to the voltage on both sides of the circuit breaker Conventionally, it has been proposed and put into practical use as a general method for introducing a circuit breaker without giving any (see Patent Document 1).

  In the prior art, a panel on which a synchronization circuit including a synchronization verification device (synchronous check relay) is mounted is installed in the control room to perform synchronization verification, and output a closing command signal to the circuit breaker. In such a conventional synchronous verification system, the voltage signal on both sides of the circuit breaker is output from the GIS control panel to the control room, and the circuit breaker is turned on at the timing when the voltage signal is synchronized from the control room to the GIS control panel A command signal is output, and the circuit breaker is turned on by the command signal.

  In some cases, GIS for overseas substations is equipped with a synchronous verification device on the GIS control panel, but in this case, the synchronous verification device for the circuit breaker body and the circuit breaker has a one-to-one correspondence. One synchronization verification device is mounted on a dedicated GIS control panel for one unit to constitute a synchronization verification circuit.

  FIG. 4 is a block diagram of a synchronous verification system for circuit breaker closing control according to the prior art.

  In FIG. 4, two parallel main circuits 100 are connected by a single circuit breaker 110 through a disconnector 111 and a disconnector 112, respectively. The circuit breaker 110 is sequentially connected to the instrument transformer (VT) 125 and the instrument transformer secondary protection circuit breaker 126 via the instrument transformer disconnecting device (VT-ID) 169. The instrument transformer secondary protection circuit breaker (MCCB) 126 further passes through the signal line 211, passes through the first GIS control panel 200a, and synchronizes the first control panel 501a in the first control room 500a. Connected to the voltage take-in section.

  In the first GIS control panel 200a, an auxiliary relay 302, an a contact 303 of the auxiliary relay 302, and a circuit breaker closing coil 301 driven by the a contact are arranged. The signal lines 201 and 202 passing through the first GIS control panel 200a are also connected to the second GIS control panel 200b.

  In the first GIS control panel 200a, the signal lines 201 and 202 are connected to the signal line 210 via the contacts 701 and 702, respectively, and for the synchronization verification of the first control panel 501a in the first control room 500a. Connected to the voltage capture unit.

  One of the two parallel main circuits 100 further passes through the instrument transformer disconnecting device 161, the instrument transformer 125a, the instrument transformer secondary protection circuit breaker 126a, and the signal in the second GIS control panel 200b. Connected to line 201. Similarly, the other of the main circuit 100 is connected to the signal line 202 in the second GIS control panel 200b via the instrument transformer disconnecting device 162, the instrument transformer 126b, and the instrument transformer secondary protection circuit breaker 126b. It is connected to the.

  In the second GIS control panel 200b, an auxiliary relay 302, an a contact 303, and a circuit breaker closing coil 301 are arranged as in the first GIS control panel 200a.

  As shown in FIG. 4, the second GIS control panel 200b is connected to the second control panel 501b in the second control room 500b.

  In the closed state of the instrument transformer disconnecting device 169 and the instrument transformer secondary protection circuit breaker 126, the secondary voltage of the instrument transformer 125 is supplied to the first control room 500a through the signal line 211. . In the closed state of the instrument transformer disconnecting device 161 or the instrument transformer disconnecting device 162, the secondary voltage of the instrument transformer 125 a or the instrument transformer 125 b is transmitted from the signal line 201 or the signal line 202 through the signal line 210. It is supplied to the first control room 500a. The timing at which the voltage signals are synchronized by the first control panel 501a on which a synchronization circuit including a synchronization verification device (synchronous check relay) provided in the first control room 500a is mounted, taking in the voltages on both sides of these circuit breakers. In response to this, a circuit breaker input command signal is output from the first control room 500a to the first GIS control panel 200a to excite the auxiliary relay 302 mounted on the first GIS control panel 200a. The circuit breaker 110 is turned on by driving the circuit breaker making coil 301 with the a contact 303.

  Even when other circuit breakers connected to the bus are turned on, the circuit breaker 110 has the same configuration.

JP 2008-153037 A

  The circuit breaker closing control in the actual operation state of the substation is usually performed by a closing command signal from a control device installed in the control room. However, in these control systems, the host control device has failed for some reason. Even in such a case, it is required that the circuit breaker can be turned on normally.

  This point is insufficient in the conventional system, and since the synchronous verification when the breaker is turned on in the GIS field control panel is not considered, the breaker cannot be turned on synchronously when the synchronous verification system fails. It was.

  Furthermore, with the recent reduction in GIS, the size of GIS control panels has also been reduced. It is physically difficult to store one synchronization verification device in each GIS control panel, and the cost has been greatly increased. There is a problem that becomes.

  The present invention is made in order to solve the above-described problems. By controlling the introduction of a plurality of circuit breakers with a single synchronous verification device, a circuit breaker having high reliability and high economic efficiency is provided. The purpose is to provide a synchronous verification system.

  In order to achieve the above object, a synchronous verification system according to the present invention includes a plurality of circuit breakers each capable of separating / connecting a plurality of AC power systems and one of the plurality of circuit breakers. The input command signal to the circuit breaker, the voltage on both sides of the circuit breaker, and the synchronization verification start signal are input, and the frequency, phase, and voltage of the voltage on both sides of the circuit breaker are within a predetermined setting range. The synchronization verification of the circuit breaker to which the input command signal is input at the earliest timing is performed with only one synchronous verification device that outputs the circuit breaker input signal at the timing and the single synchronous verification device. First-arrival priority means for blocking activation of the synchronous verification device by input of a circuit breaker closing signal from another line until the circuit breaker closing operation is completed.

  According to the present invention, by providing an input / output signal selection circuit for a synchronous verification device, a single synchronous verification device can control a plurality of circuit breakers, thereby achieving high reliability and high economic efficiency. A circuit breaker synchronous verification system having

1 is an overall block diagram of an embodiment of a synchronization verification system according to the present invention. FIG. 2 is a detailed enlarged view of a part A in FIG. 1. FIG. 2 is a detail enlarged view of one part B of FIG. 1. The whole block diagram of the conventional synchronous verification system.

  Hereinafter, an embodiment of a synchronization verification system according to the present invention will be described with reference to FIGS. 1 to 3. Here, the same or similar parts as those in the prior art shown in FIG.

  1 is an overall block diagram of an embodiment of a synchronization verification system according to the present invention, FIG. 2 is a detailed enlarged view of one part A of FIG. 1, and FIG. 3 is a detailed enlarged view of one part B of FIG. FIG.

  The parallel two-system main circuit 100 is connected by a single circuit breaker 110 through a disconnector 111 and a disconnector 112, respectively. The circuit breaker 110 is sequentially connected to the instrument transformer 125 and the instrument transformer secondary protection circuit breaker 126 via the instrument transformer disconnecting device 169. The instrument transformer secondary protection circuit breaker 126 is further connected to the signal line 204 via the signal line 801 and the a contact 213 in the first GIS control panel 200a.

  In the first GIS control panel 200a, the signal lines 201 and 202 are connected to the signal line 203 via auxiliary contacts 802 and 212 and further via an a contact 213, respectively. The signal lines 201 and 202 are signal lines for commonly passing the secondary voltage of the bus side instrument transformers 125a and 125b taken into the second GIS control panel 200b to all GIS control panels.

  Signal lines 201, 202, 203, and 204 passing through the first GIS control panel 200a also communicate with the second GIS control panel 200b.

  In the first GIS control panel 200a, an auxiliary relay 302, an a contact 303 of the auxiliary relay 302, and a circuit breaker closing coil 301 driven by the a contact are arranged.

  One of the two parallel main circuits 100 further passes through the instrument transformer disconnecting device 161, the instrument transformer 125a, the instrument transformer secondary protection circuit breaker 126a, and the signal in the second GIS control panel 200b. Connected to line 201. Similarly, the other of the main circuit 100 is connected to the signal line 202 in the second GIS control panel 200b via the instrument transformer disconnecting device 162, the instrument transformer 125b, and the instrument transformer secondary protection circuit breaker 126b. It is connected to the.

  In FIG. 1, the first GIS control panel 200a shows only one line, but the same circuit is connected in parallel to constitute a synchronous verification system for a plurality of circuit breakers 110. .

  The synchronization verification device 700 is mounted only on the second GIS control panel 200b.

  The signal lines 203 and 204 are signal lines for supplying voltage signals on both sides of the circuit breaker 110 to the synchronization verification device 700. When the circuit breaker 110 is turned on, the auxiliary contacts 802 or 212 of the disconnector 111 or 112 are connected. According to the on / off state, either the signal line 201 or 202 indicating the bus voltage is supplied.

  The signal line 205 is a signal line for supplying a synchronization verification activation signal to the synchronization verification device 700, and the signal line 206 is a signal line for supplying a synchronization verification interruption signal to the synchronization verification device 700.

  A circuit for driving the circuit breaker closing coil 301 of the circuit breaker 110 is configured between the control power supplies 601+ (plus side) and 601- (minus side). Switch 610, circuit breaker closing control ON / OFF switch 611, circuit breaker closing operation switch 612 of the GIS control panel, auxiliary relays 613 to 618 for synchronization verification, circuit breaker closing coil 301 of circuit breaker 110, circuit breaker closing coil 301 It is an auxiliary relay 302 for driving.

  The signal line 207+ and the signal line 207- are signal lines for passing DC power to all GIS control panels when the synchronization verification of any one of the circuit breakers is activated.

  Next, the circuit breaker closing operation of the circuit breaker synchronization verification system according to the present embodiment will be described.

  When the breaker 110 of the GIS control panel 200a is turned on using the breaker closing operation switch 612, the switch 610 is switched to the (direct) position, and the switch 611 is turned “ON”. As a result, the circuit breaker to be synchronized is selected, and the auxiliary relays 615 and 614 are excited. The a contact 213 is turned “ON” by the excitation of the auxiliary relay 615, and the voltage on both sides of the circuit breaker 110 of the line is supplied to the synchronous verification device 700.

  Thereafter, when the circuit breaker closing operation switch 612 is turned on, the auxiliary relay 613 is excited to turn on the contact a 626, and the auxiliary relay 617 is excited to turn on the contact a 627 to turn on the signal line. A synchronization verification activation signal is input to the synchronization verification device 700 through 205.

  Further, when the auxiliary relay 615 is excited, the contact a 621 is turned “ON”, and DC power is supplied to the signal lines 207+ and 207−. As a result, the auxiliary relay 618 of all GIS control panels is excited, and the b contact 625 is turned “OFF” to block the excitation of the auxiliary relay 617 of all GIS control panels. However, for the control panel in which the circuit breaker is turned on, the b relay 635 of the auxiliary relay 615 does not excite the auxiliary relay 618 only in the circuit for the circuit breaker.

  As a result, until the circuit breaker 110 is completely turned on or the control right of the circuit breaker is lost, it becomes impossible to input a synchronization verification activation signal other than the circuit breaker, and a single synchronization verification device 700 can control the plurality of circuit breakers 110. Synchronous verification can be performed.

  As a method for preventing multiple operations, a switch with a key can be applied to the circuit breaker closing control ON / OFF switch 611 mounted on each control panel, and only one key can be used when operating the circuit breaker.

  Furthermore, it goes without saying that both systems can be used together.

  Next, functions from when the synchronization verification device 700 is activated until the circuit breaker 110 is turned on will be described.

  After the activation signal is input to the synchronization verification device 700 by the contact a 627 of the auxiliary relay 617, the operation of the synchronization verification device 700 is started, and the input command signal output at the timing when the voltage amplitude, phase and frequency are within a certain set range. Then, the circuit breaker 110 is turned on and the circuit breaker making operation is completed.

  If the operation of the switch 610 or the switch 611 is performed during the period from the start of the operation of the synchronous verification device 700 to the completion of the closing of the circuit breaker 110, it is considered that the control right for the circuit breaker has been lost. , 611 is determined by the auxiliary relay 614. As a result, it is possible to monitor the presence or absence of the control right, and a synchronization verification interruption signal can be input to the synchronization verification device 700 through the signal line 206 by the b contact 629 of the auxiliary relay 614.

  At this time, the excitation of the auxiliary relay 617 is canceled by the a contact 630 of the auxiliary relay 614, and the input of the synchronous detection activation signal to the synchronous verification device 700 is interrupted by turning off the a contact 627 of the auxiliary relay 617. Yes.

  As described above, the instrument transformer disconnecting devices 169, 161, 162, the instrument transformer secondary protection circuit breakers 126, 126a, 126b, from the start of operation of the synchronous verification device 700 to the completion of the insertion of the circuit breaker 110, The auxiliary relay 616 is combined to constitute a state monitoring circuit for the instrument transformer disconnecting device and the instrument transformer secondary protection circuit breaker. As a result, when the instrument transformer disconnecting device or the instrument transformer secondary protection circuit breaker is open, the synchronization verification interruption signal is input to the synchronization verification device 700 through the signal line 206 by the contact a 631 of the auxiliary relay 616. can do. At this time, the excitation of the auxiliary relay 617 is canceled by the b contact 632 of the auxiliary relay 616 and the a contact 627 of the auxiliary relay 617 is turned “OFF”, thereby interrupting the input of the synchronization verification activation signal to the synchronization verification device 700. ing.

  The synchronous verification system shown in the present embodiment is an example of a circuit breaker closing operation from the GIS control panel, and can be applied to a circuit breaker synchronous verification circuit in the GIS control panel in response to an input command from the control room.

  As described above, in this embodiment, the auxiliary relay 618 is mounted on all the lines, the signal line is provided between the power supply panels of the auxiliary relay, and only the voltage on both sides of only the selected circuit breaker is synchronized. By configuring a circuit to supply to 700 and a circuit to block simultaneous operation of a plurality of circuit breakers connected to the same bus, a plurality of circuit breakers 110 can be controlled to be controlled by only one synchronous verification device 700. Is possible.

  Furthermore, as a function for preventing multiple selection, the circuit breaker closing control ON / OFF switch 611 is a switch with a key and is operated with one key, so that a plurality of circuit breakers 110 can be obtained with only one synchronous verification device 700. Can be controlled, and the above-described electrical block circuit can be used in combination.

  In addition, it is possible to provide a circuit breaker synchronization verification system with higher reliability by adding a state monitoring function for the instrument transformer disconnection device and instrument transformer secondary protection circuit breaker on the secondary side of the instrument transformer. Can be provided.

100 ... Main circuit 110 ... Breaker 111, 112 ... Disconnector 125, 125a, 125b ... Instrument transformer (VT)
126, 126a, 126b ... Instrument transformer secondary protection circuit breaker (MCCB)
161, 162, 169 ... Instrument transformer disconnecting device (VT-ID)
200a, 200b ... GIS control panels 201-206, 207+, 207-, 210, 211 ... Signal line 212 ... Auxiliary contact 213a ... Contact 301 ... Breaker closing coil 302 ... Auxiliary Relay 303 ... a contact 500a ... first control chamber 500b ... second control chamber 501a ... first control panel 501b ... second control panel 601+, 601 -... Control power source 610 ... Remote direct control right changeover switch 611 ... Breaker closing control ON / OFF switch 612 ... Breaker closing operation switch 613-618 ... Auxiliary relays 621, 626, 627, 630, 631 ... a contact 625,629,632,635 ... b contact 700 ... synchronization verification device 701,702 ... contact 801 ... Signal line 802 ... auxiliary contact

Claims (5)

Multiple circuit breakers that can separate and connect multiple AC power systems,
When one of the plurality of circuit breakers is turned on, a turn-on command signal for the circuit breaker, a voltage on both sides of the circuit breaker, and a synchronization verification activation signal are input, One synchronous verification device that outputs a circuit breaker closing signal at a timing when the frequency, phase, and voltage are within a predetermined setting range;
Using only one of the above-mentioned synchronization verification devices, the circuit breaker to which the input command signal is input is verified at the earliest timing, and the circuit breaker input signal from other lines is not output until the operation of the target circuit breaker is completed. First-come-first-served means for blocking activation of the synchronization verification device by input;
Synchronous verification system. An auxiliary relay for amplifying an input signal necessary for the synchronization verification;
2. The synchronous verification system according to claim 1, wherein the first priority means includes a first priority circuit using a contact of the auxiliary relay.   2. The synchronous verification system according to claim 1, wherein the first-come-first-served means includes an activation keyed switch for preventing multiple operations.   4. The circuit according to claim 1, wherein the first-priority means blocks the circuit breaker closing control when the disconnector or circuit breaker for secondary protection of the instrument transformer is open. 5. Synchronous verification system described in 1.   The synchronization verification system according to any one of claims 1 to 4, further comprising means for forcibly interrupting the synchronization verification during the synchronization verification.

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