CN109193583B - Control circuit for self-adaptive switching of inner bridge connection short lead protection - Google Patents
Control circuit for self-adaptive switching of inner bridge connection short lead protection Download PDFInfo
- Publication number
- CN109193583B CN109193583B CN201811127817.XA CN201811127817A CN109193583B CN 109193583 B CN109193583 B CN 109193583B CN 201811127817 A CN201811127817 A CN 201811127817A CN 109193583 B CN109193583 B CN 109193583B
- Authority
- CN
- China
- Prior art keywords
- relay
- normally
- power supply
- tcj
- closed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000002955 isolation Methods 0.000 claims abstract description 30
- 238000012544 monitoring process Methods 0.000 claims description 65
- 238000004804 winding Methods 0.000 claims description 21
- 230000009471 action Effects 0.000 claims description 20
- 238000005259 measurement Methods 0.000 claims description 5
- 230000007246 mechanism Effects 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- 230000005611 electricity Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
Landscapes
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention discloses a control circuit for self-adaptive switching of short lead protection of an inner bridge connection, which comprises an isolation disconnecting link input control power supply loop, an isolation disconnecting link reclosing relay power-taking control loop and a short lead protection self-adaptive switching control loop.
Description
Technical Field
The invention relates to a safety control circuit, in particular to a control circuit for self-adaptive switching of short lead protection of an inner bridge connection.
Background
In recent years, the electric power system is widely popularized and fully remotely controlled for service practicability, a remote control technology covers secondary equipment, in order to standardize remote operation of the secondary equipment, a soft remote control mode is required to be adopted for remote control of the protection equipment, a hard pressing plate for protecting on-site outlet of the equipment and a hard pressing plate for remote operation input are required to be arranged at the input positions, and the hard pressing plate for protecting function performs switching according to the following principles:
(1) The soft pressing plate is required to be thrown and withdrawn for protection remotely, when the soft pressing plate is in an AND logic state, the on-site functional hard pressing plate is always in a throwing position, and when the soft pressing plate is in an OR logic state, the on-site functional hard pressing plate is always in a releasing position.
(2) The protection function is required to automatically switch along with the change of the external switch-in contact, and when the external switch-in contact and the functional hard pressing plate are in OR logic, the on-site hard pressing plate is always at the release position; when the external opening and closing point and the functional hard pressing plate are in AND logic, the on-site hard pressing plate is always at the input position.
The mode that the protection function automatically follows the change of the external switching contact to switch is adopted, and the mode is also commonly called as a self-adaptive mode. At present, the protection of short lead wires in a power grid is to rely on a disconnecting link to assist a normally-closed contact to automatically switch and withdraw.
The main wiring of 220 KV transformer substation 220 KV system is an enlarged inner bridge wiring, and in order to improve the reliability of power supply of the system, as shown in the following figure 1, the 220 KV system still keeps full mode operation during any main transformer service maintenance, so that 6 sets of short lead protection are doubly configured in the 220 KV system, namely two sets of short lead protection are respectively configured between 1DL and 3DL, between 3DL and 4DL and between 2DL and 4DL, and the corresponding short lead protection is automatically input when each main transformer high-voltage side isolation disconnecting link Ge is disconnected.
When any main transformer body is overhauled on site, the three-side circuit breaker of the main transformer is disconnected firstly, then the isolating switch Ge of the high-voltage side of the main transformer is disconnected, namely, the operation of the 220 kilovolt circuit breaker is restored by disconnecting the 1Ge isolating switch, the 2Ge isolating switch or the 3Ge isolating switch, so that the main transformer body is overhauled and effectively isolated from a 220 kilovolt system in operation.
A 220 kv short lead protects the open loop as shown in fig. 2. The short lead protection input forced hard pressing plate and the normally closed auxiliary contact of the external main transformer high-voltage side lead isolating switch form an open-in parallel connection loop, and the LP1 function hard pressing plate is normally operated to be placed at an open position.
The self-adaptive mode of automatically following the external disconnecting link to assist the contact to throw and retract for protection has very high requirements on the working reliability of the external switching contact, and the discrimination mode of adopting the single-state contact has great operation hidden danger and risk in the actual power grid operation, so that the power grid operation risk can be avoided by adopting a safety control measure. There are two main aspects of current risk in operation:
risk 1: when the 220 KV system operates in a full mode and the main transformer operates normally, normally closed auxiliary contacts of a main transformer high-voltage side isolating switch in operation are opened by mistake (including wiring error or travel switch error closing), short-lead protection is automatically put into, load current flowing through the 220 KV side of the main transformer is the differential current of the short-lead protection (equivalent to faults in a short-lead area), and when the load current reaches a short-lead protection differential current starting setting value, the short-lead protection can malfunction, and the main transformer 220 KV circuit breaker in error tripping operation.
Risk 2: when a 220 KV system operates in a full mode, and a main transformer body overhauls, in the operation process, normally closed auxiliary contacts of a main transformer high-voltage side isolating switch are disconnected by mistake (including loose wiring or disconnection by mistake of a travel switch), two sets of short lead protection can be caused to automatically withdraw, no rapid main protection operation is caused between two 220 KV circuit breakers corresponding to the main transformer in outage, the section breaks down, tripping and isolation are carried out by the line protection of opposite side transformer stations of two incoming lines of the transformer substation, and the 220 KV system of the transformer substation is caused to lose voltage and even the transformer substation is caused to be completely stopped.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a control circuit capable of preventing short-lead protection from being misplaced and retracted caused by the error conduction or the error disconnection of a normally closed auxiliary contact of a main transformer high-voltage side isolating switch and a secondary circuit thereof in operation, meeting the control requirement of remote operation and adding a safety control circuit to an opening loop of a short-lead protection isolating switch.
The control circuit comprises an isolation disconnecting link input control power supply loop, an isolation disconnecting link restarting relay power-taking control loop and a short lead protection self-adaptive switching control loop, wherein the isolation disconnecting link input control power supply loop is formed by adding a direct current power supply idle switch 1DK in a 220 kilovolt short lead protection screen, a power supply idle switch input is connected with a short lead protection power supply idle switch input power supply in the screen in parallel, 1JJ and 2JJ power supply monitoring relays are also arranged, power supply failure signals of the power supply monitoring relays are monitored by a monitoring system, and the 1JJ and 2JJ power supply monitoring relays are used for monitoring working power supplies of the control loops ZJ and TCJ relays;
the isolating knife switch restarting relay electricity-taking control loop comprises a ZJ relay, wherein the ZJ relay is an electric maintaining double-position relay, the relay is provided with two coils, one is an action coil ZJ-I, the other is a resetting coil ZJ-II, the electric maintaining double-position relay only works in one state, the normally open contacts of 1YJJ1 and 1YJJ2 (AB phase) of the monitoring PT protection winding secondary voltage 1YJJ1 and 1YJJ2 (BC phase) relay are connected with the normally closed contacts of 2YJJ1 and 2YJJ2 (BC phase) of the monitoring PT metering winding secondary voltage 2YJJ1 and 2YJJ2 (BC phase) relay in series to start the ZJ relay electricity-taking loop, the normally open contacts of 1YJJ1 and 1YJJ2 (AB phase) of the monitoring PT protection winding secondary voltage 1YJJ1 and 1YJJ2 (BC phase) relay are connected with the normally open contacts of 2YJJ1 and 2YJJ2 (AB phase) of the monitoring metering winding secondary voltage 2YJJ1 and 2 (BC phase) and 2YJJ2 (BC phase) of the normally open contacts of the monitoring PT protection winding secondary voltage 2YJJ1 and 2 (BC phase) and the normally open contacts of 2JJ 2 ZJ relay are connected with the normally open contacts of 2 ZJ relay, when the direct current power supply works normally, the working state of the relay is controlled by two external input contacts of the coil, when the short lead corresponds to the non-voltage of the bus of the corresponding section when the circuit breaker is out of service, the secondary voltages 1YJJ1 (AB phase) and 1YJJ2 (BC phase) of the PT protection winding are monitored to act at low voltage, the normally closed contacts 1YJJ1 and 1YJJ2 are switched on, the normally open contacts 1YJJ1 and 1YJJ2 are switched off, the secondary voltages 2YJJ1 (AB phase) and 2YJJ2 (BC phase) of the PT metering winding are monitored to act at under voltage, the normally closed contacts 2YJJ1 and 2YJJ2 are switched on, the normally open contacts 2YJJ1 and 2YJJ2 are switched off, the ZJ relay is driven to act as the coil at the moment, the normally open contacts ZJ are switched off, the isolating knife switch magnetic-holding double-position heavy-duty relay is switched on, meanwhile, when the remote connection point is opened and the remote connection point is not closed in the working state, the relay is always kept in the working state, when the corresponding section bus is electrified when the short lead corresponding to the breaker is closed, the relays 1YJJ1, 1YJJ2, 2YJJ1 and 2YJJ2 are all pressed back, the normally open connection points 1YJJ1, 1YJJ2, 2YJJ1 and 2YJJ2 are closed, the normally closed connection points 1YJJ1, 1YJJ2 and 2YJJ2 are opened, the relay is driven to return to the coil action, the normally open connection point ZJ is opened, the normally closed connection point ZJ is opened, the TCJ working negative power supply of the relay is disconnected, and meanwhile, the relay is always kept in the return state when the remote connection point is opened and the remote connection point is not closed in the working state, and the relay is always kept in the return state, when the direct current is lost in the working state, the relay is disconnected, the normally closed, the relay is disconnected, and the negative working negative power supply is returned;
the short lead protection self-adaptive switching control loop comprises a switching control circuit: the device comprises a normally closed auxiliary contact at a single Ge position of a main transformer high-voltage side isolation disconnecting link, and is further added with a normally open auxiliary contact input from a Ge disconnecting link mechanism box to a protection room, wherein a magnetic latching double-position heavy-acting relay TCJ and single-position heavy-acting relays 1YQJ and 2YQJ are respectively started, the relay TCJ is used for controlling an external input auxiliary contact, and the relay TCJ contact is used as a short lead protection switching criterion; the relay 1YQJ and 2YQJ are used for monitoring the input contact state of the isolating switch and the secondary circuit in real time, the magnetic-latching double-position double-acting relay TCJ is provided with two coils, one is an action coil TCJ-I, the other is a reset coil TCJ-II, the magnetic-latching double-position relay only works in one state and keeps the original working state unchanged under the condition of power failure, when the direct current power supply works normally, the working state of the magnetic-latching double-position relay is controlled by the external input contacts of the two coils, when the normally open auxiliary contact of the isolating switch Ge at the high voltage side of the main transformer is closed, the normally closed auxiliary contact is opened, the action coil of the driving TCJ relay acts, the normally closed contact of the TCJ relay is opened, the normally closed auxiliary contact of the driving TCJ relay acts, the normally closed return coil acts, the normally closed contact of the TCJ is closed, the short-lead protection input is sent to the monitoring system for monitoring, and the short-lead protection input is sent to the monitoring system for monitoring. The relays 1YQJ and 2YQJ respectively monitor the input states of a normally open auxiliary contact and a normally closed auxiliary contact of the isolating disconnecting link on the high-voltage side of the main transformer and a secondary circuit in real time, when the normally open auxiliary contact of the isolating disconnecting link Ge is closed, 1YQJ acts, and when the normally open auxiliary contact of the isolating disconnecting link Ge is opened, 1YQJ returns; when the Ge normally-closed auxiliary contact of the isolation disconnecting link is closed, 2YQJ acts, and when the Ge normally-closed auxiliary contact is opened, 2YQJ returns, and the restarting signals of the two restarting relays are sent to the monitoring system for monitoring.
In summary, compared with the prior art, the invention has the following advantages:
according to the invention, the contact of the double-position heavy-duty magnetic latching relay of the main transformer high-voltage side isolating switch is connected to the short-lead protection switching value input loop, the double-position heavy-duty magnetic latching relay is directly driven by the normally-open and normally-closed auxiliary contact of the external isolating switch, and the short-lead protection misswitching caused by the single normally-closed auxiliary contact and the loop being switched on or off by mistake in the prior art can be prevented by adopting the measures. On the basis of adopting a double-position reclosing relay, in order to prevent protection misswitching caused by working state errors of normally-open and normally-closed auxiliary contacts of an isolation disconnecting link in the operation process, a power taking loop for controlling the working power supply of the reclosing relay is designed, the power taking loop determines the working state of a power taking double-position electric holding relay according to the voltage condition of a corresponding bus segment of a short lead protection, the short lead protection can be switched only in a bus non-voltage state, the working power supply of the reclosing relay is reliably disconnected when the bus is in operation, protection misswitching caused by misoperation or disconnecting link state misswitching is avoided, the switching operation of the short lead protection is safely and reliably realized, meanwhile, the requirement of remote operation self-adaptive control is met, and when the protection is in double configuration, a control circuit is also in double-set configuration, and only one control circuit is taken as an example.
Drawings
Fig. 1 is a diagram of a prior art 220 kv substation 220 kv system for expanding the main wiring of an inner bridge.
Fig. 2 is a circuit diagram of a prior art 220 kv short-lead pitch and roll control.
Fig. 3 is a circuit diagram of a short-lead switching control circuit of the present invention.
Detailed Description
The present invention will be described in more detail with reference to examples.
Example 1
The control circuit comprises an isolation disconnecting link input control power supply loop, an isolation disconnecting link reclosing relay power-taking control loop and a short lead protection self-adaptive switching control loop.
(1) Isolation switch input control power supply loop: the direct current power supply idle-on 1DK is added in the 220 KV short lead protection screen, the power supply idle-on input is connected in parallel with the short lead protection power supply idle-on input power supply in the screen, and the power supply mainly provides a control power supply for the isolation disconnecting link input loop. Meanwhile, in order to realize the monitoring of working power supplies of the ZJ and TCJ relays of the control loop, 1JJ and 2JJ power supply monitoring relays are respectively arranged, and power supply loss signals of the relays are sent to a monitoring system for monitoring.
(2) Isolation switch re-actuating relay electricity taking control circuit: in order to prevent the normally open and normally closed auxiliary contacts of a disconnecting link from a mechanism box to a protection chamber from being simultaneously and mistakenly disconnected, a control loop for isolating the disconnecting link to re-operate the relay to take electricity is added. The ZJ relay is used for controlling the isolating switch to magnetically keep the heavy-duty relay to take electricity, the relay is an electrically keep double-position relay, the relay is provided with two coils, one is an action coil ZJ-I, the other is a return coil ZJ-II, the electrically keep double-position relay only works in one state, when the direct current power supply works normally, the working state of the relay is controlled by the external input contact of the two coils, when the short lead corresponds to the non-voltage of a bus of a corresponding section when the circuit breaker is in stop operation, the secondary voltage 1YJJ1 (AB phase) and the 1YJJ2 (BC phase) relay are monitored, the normally closed contacts of the 1YJJ1 and 1YJJ2 are closed, the normally closed contacts of the 1YJJ1 and 1YJJ2 are opened, the normally closed contacts of the PT metering winding 2YJJ1 (AB phase) and 2YJJ2 (AB phase) relay are monitored, the normally open contacts of the 2YJJ1 and 2YJJ2 are closed, the normally closed contacts of the two-phase relay are monitored, the normally open contacts of the ZJJ 2 are closed when the circuit breaker is in stop operation, the normally closed state is kept on, and the normally open contacts of the circuit breaker is kept open when the two-phase relay is kept open, and the normally open state is kept on, and the normally open contacts are closed when the two relay is in the state and the relay is kept open. When the corresponding section bus is electrified when the short lead corresponds to the breaker to be switched on, the relays 1YJJ1, 1YJJ2, 2YJJ1 and 2YJJ2 are all pressed back, the normally open contacts 1YJJ1, 1YJJ2, 2YJJ1 and 2YJJ2 are switched on, the normally closed contacts 1YJJ1, 1YJJ2, 2YJJ1 and 2YJJ2 are switched off, at the moment, the reset coil action of the ZJ relay is driven, the normally open contact of the ZJ is switched off, the normally closed contact of the ZJ is switched on, the working negative power supply of the relay TCJ is switched off, meanwhile, the common measurement and control device is fed up by the action of the ZJ power-off signal, and when the remote tapping contact is switched off in the working state and the remotely closed contact is not closed, the relay is always kept in the reset state. When the direct current power supply disappears in operation, the two coils of the relay are reset after both the coils are lost, and the TCJ working negative power supply of the relay is disconnected.
In order to ensure that when the short lead wire protection corresponds to the bus segment without voltage, the ZJ relay power-taking operation can be executed under the condition that the secondary voltage of each winding of the corresponding bus PT is lost, and therefore all normally-closed contacts of the protection and metering winding monitoring relay are connected in series to start a ZJ relay power-taking loop. On the other hand, when the corresponding bus segment is electrified, the ZJ relay outage operation can still be reliably executed to prevent the abnormality of the corresponding bus PT relay monitoring relay, so that all normally open contacts of the protection and metering winding monitoring relay are adopted to connect and start the ZJ relay outage loop.
(3) Short-lead protection self-adaptive switching control loop: the scheme is that normally closed auxiliary contacts at a single position of a main transformer high-voltage side isolation disconnecting link Ge are adopted in a short-lead protection primary opening loop, and input of normally open auxiliary contacts from a Ge disconnecting link mechanism box to a protection room is added on the basis of the primary scheme, a magnetic-latching double-position reclosing relay TCJ and single-position reclosing relays 1YQJ and 2YQJ are respectively started, wherein the relay TCJ is used for controlling external input auxiliary contacts, and the relay contacts are used as short-lead protection opening criteria; the relays 1YQJ and 2YQJ are used for monitoring the state of the input contact of the isolating switch and the secondary circuit in real time. The magnetic latching double-position relay TCJ is provided with two coils, one is an action coil TCJ-I and the other is a reset coil TCJ-II, and the magnetic latching double-position relay only works in one state and keeps the original working state unchanged under the condition of power failure, which is the biggest difference from the electric latching double-position relay. When the direct-current power supply works normally, the working state of the relay is controlled by external input contacts of two coils, when the normally open auxiliary contact of the isolating disconnecting link Ge at the high-voltage side of the main transformer is closed, the normally closed auxiliary contact is opened, the action coil of the TCJ relay is driven to act at the moment, the normally closed contact of the TCJ is opened, the short lead is protected from being put into, and a signal is not sent to a monitoring system. When the normally open auxiliary contact of the isolation disconnecting link Ge of the main transformer high-voltage side is opened and the normally closed auxiliary contact is closed, the resetting coil of the TCJ relay is driven to act, the normally closed contact of the TCJ is closed, the short lead is protected, and a TCJ maintaining signal is sent to a monitoring system for monitoring. The relays 1YQJ and 2YQJ respectively monitor the input states of a normally open auxiliary contact and a normally closed auxiliary contact of the isolating disconnecting link on the high-voltage side of the main transformer and a secondary circuit in real time, when the normally open auxiliary contact of the isolating disconnecting link Ge is closed, 1YQJ acts, and when the normally open auxiliary contact of the isolating disconnecting link Ge is opened, 1YQJ returns; when the Ge normally-closed auxiliary contact of the isolation disconnecting link is closed, 2YQJ acts, when the Ge normally-closed auxiliary contact is opened, 2YQJ returns, and the heavy-duty signals of the two heavy-duty relays are sent to the monitoring system for monitoring, so that abnormal states of the auxiliary contact and the secondary circuit can be found during normal operation.
When a regulating person or an operation and maintenance person receives an operation command for changing the operation mode of the system, after opening the circuit breakers at each side of a to-be-overhauled or equal input main transformer, a short lead protection corresponding bus section is in a voltage losing state, then driving the ZJ relay to act, confirming that the ZJ relay acts reliably through a ' TCJ power-on ' signal of a monitoring system, switching on a TCJ negative power supply, when the operation of opening or closing a Ge disconnecting link is finished by changing the operation mode of the system, monitoring whether the state of a Ge auxiliary contact is correct or not in real time through 1YQJ and 2YQJ, at the moment, opening and closing the Ge normally-open auxiliary contact and a normally-auxiliary contact or not corresponding to the actual state of the relay, and judging whether the state of the short lead protection switching on state is correct or not according with the ' 1YQJ and 2YQJ non-holding ' signals of the monitoring system if the state is incorrect, because the corresponding circuit breakers do not execute switching on operation at the moment, and the overhauling personnel should be informed to check whether the state of the abnormal auxiliary circuit is correct or not, and confirm whether the state of the short lead protection switching on state is correct or not by the monitoring system ' magnetic state of the normally-on the normally-processed, and the state of the Ge normally-closed normally-moving normally-monitored by the monitoring system is confirmed, and whether the state of the short lead protection switching on protection is correct or not is correct. When the breaker operation corresponding to the short-lead-on protection is executed, the corresponding bus segment is electrified, the ZJ relay is driven to reset, the reliable reset of the ZJ relay is confirmed through the TCJ power-off signal of the monitoring system, the reliable reset of the short-lead-on protection is confirmed through the 1YQJ and 2YQJ non-holding signals of the monitoring system and the reliable disconnection of the negative power supply of the TCJ relay is confirmed through the direct-current power-off alarm signal of the 2JJ relay, at the moment, the TCJ relay does not receive an external Ge auxiliary contact any more, even if the state of the auxiliary contact is wrong in operation, the TCJ relay is not driven by mistake, the short-lead-on protection is misthrown in operation, the reliable throwing of the short-lead-on protection is safely and effectively ensured, and the protection is not refused to operate in operation. Through the operation and the safe and reliable self-adaptive switching operation of the short lead protection, if the system operation mode changes again, the next switching operation of the short lead is needed, and the operation steps are the same.
When the master station remotely executes programmed operation, the switch and disconnecting link deflection information in each operation step and corresponding signal change confirmation in the operation process are listed in a sequential control operation ticket, and the operation process automatically tracks corresponding signal and information change according to equipment state change so as to judge whether to execute the next operation step, and manual intervention is not needed, so that the operation tasks of changing the operation mode of the inner bridge and automatically switching short lead protection are completed quickly, safely and reliably.
Fig. 3 circuit connection relationship description:
(1) Isolation switch input control power supply loop: a direct current power supply idle switch 1DK is added in a 220 KV short lead protection screen, the idle switch power supply and the short lead protection power supply are connected in parallel in the screen, and the power supply mainly provides power for an isolation disconnecting link input and control loop. The power monitoring relay 1JJ is connected in parallel with a power-taking control relay ZJ power circuit, the power monitoring relay 2JJ is connected in parallel with a position-restarting maintaining relay TCJ power circuit, the positive end of a relay coil is connected with a positive power end, the negative end of the relay coil is connected with a negative power end, the working power states of the ZJ TCJ relay are respectively monitored, and when the corresponding section of power disappears, the power loss contact of the 1JJ relay and the 2JJ relay sends a monitoring system to remind monitoring disc personnel.
(2) Isolation switch re-actuating relay electricity taking control circuit:
in order to prevent the normally open and normally closed auxiliary contacts of a disconnecting link from a mechanism box to a protection chamber from being simultaneously and mistakenly disconnected, a control loop for isolating the disconnecting link to re-operate the relay to take electricity is added. The starting circuit of the power-taking control circuit is connected with the series normally-closed contacts of the voltage monitoring relay for monitoring the voltage of the corresponding bus segment PT protection and metering voltage winding, the monitoring relays 1YJJ1, 1YJJ2, 2YJJ1 and 2YJJ2 are respectively connected in parallel with the AB phase and the BC phase of the protection and metering voltage winding, when the bus is pressureless, secondary voltages of all windings are not output, the normally-closed contacts of the four relays are closed, the action coil of the power-taking control double-position electric holding relay ZJ is started, the ZJ relay acts, and the ZJ normally-open contact is connected with the negative power supply of the position re-acting relay TCJ. When the bus is pressed, the protection and metering voltage winding has output voltage, and if the normally open contact of any relay is closed, the reset coil of the power-taking control double-position relay ZJ is started, the ZJ relay returns, and the normally open contact of the ZJ is disconnected with the negative power supply of the TCJ relay. The ZJ relay normally open contact sends a monitoring system to remind a prison disc personnel. When direct current power failure occurs in operation, the electric holding relay ZJ returns, the ZJ normally open contact breaks the negative power supply of the TCJ relay, short lead protection switching operation cannot be performed at the moment, and the operation can be continued after abnormal treatment is normal. The short lead protection corresponds to the bus segment with or without pressure, characterizes the actual running state of primary equipment, can carry out the operation of throwing and withdrawing of the short lead protection only when the corresponding circuit breaker is out of service when the bus is not pressed, and the primary system is in the running state at the moment when the bus is pressed, can not carry out the operation of throwing and withdrawing of the short lead protection, and is also an important measure for preventing the short lead protection from being thrown and withdrawn by mistake in the running process.
(1) Short-lead protection self-adaptive switching control loop:
in order to prevent misleading and misbreaking or misbreaking of the short lead protection switching-in loop in the operation or running of the normally closed auxiliary contact or the secondary loop of the Ge unit position of the main transformer high-voltage side isolation disconnecting link, misswitching and tripping of the short lead protection are caused. The scheme is that after a negative power supply is connected through the action of an isolation disconnecting link Ge, when the isolation disconnecting link Ge is disconnected, the normally open auxiliary contact is disconnected, the normally closed auxiliary contact is connected, meanwhile, an action coil of a reset magnetic latching relay TCJ at the starting position and a reset relay 1YQJ at the unit position are both operated, the normally open contacts of the two relays are all connected, one auxiliary contact of the TCJ is opened to a short lead for protection, namely, the short lead for protection is put into, and the protection-in deflection information is sent to a monitoring system through a soft message, and the other auxiliary contact of the TCJ and the 1YQJ contact are also sent to the monitoring system to remind a prison disc personnel. When the isolating knife switch Ge is switched on, the normally closed auxiliary contact is disconnected, the normally open auxiliary contact is connected, the reset coil of the reset magnetic latching relay TCJ at the starting position and the reset relay 2YQJ at the unit position are simultaneously started, the TCJ relay returns, the 2YQJ relay acts, the normally open contact of the TCJ is disconnected, namely, the switch-in of the switch-out protection is disconnected, the switch-out protection is withdrawn, the corresponding protection switch-in deflection information is sent to the monitoring system through a soft message, and the normally open contact of the 2YQJ is sent to the monitoring system to remind a prison disc personnel. In the short lead switching process (namely, the TCJ negative power supply stage), if the position states of normally open and normally closed auxiliary contacts of the isolating switch Ge are inconsistent with the actual state of primary equipment, the corresponding equipment states can be checked through TCJ, 1YQJ and 2YQJ, and at the moment, an maintainer should be timely informed to eliminate the site abnormality and then the next operation can be carried out. In the process of putting in or withdrawing from operation of the short lead (namely, in the power-off stage of a TCJ negative power supply), if the normally open and normally closed auxiliary contact position states of the isolation disconnecting link Ge are inconsistent with the actual state of primary equipment, the corresponding equipment states are checked through 1YQJ and 2YQJ at the moment, and then an maintainer is informed of handling the abnormality, so that the short lead protection switching cannot be influenced under the state. When the direct current power supply loses power in the operation process, the working state of the TCJ magnetic latching relay is not affected, and the false switching of short lead protection is not caused.
The undescribed portion of this embodiment is identical to the prior art.
Claims (1)
1. An inner bridge connection short lead protection self-adaptive switching control circuit is characterized in that: the automatic switching control circuit comprises an isolation disconnecting link input control power supply loop, an isolation disconnecting link restarting relay power-taking control loop and a short lead protection self-adaptive switching control loop, wherein the isolation disconnecting link input control power supply loop is formed by adding a direct current power supply idle switch 1DK in a 220 kilovolt short lead protection screen, the power supply idle switch input is connected with a short lead protection power supply idle switch input power supply in parallel in the screen, 1JJ and 2JJ power supply monitoring relays are also arranged, the power supply power loss signals of the power supply monitoring relays are monitored by a monitoring system, and the 1JJ and 2JJ power supply monitoring relays are used for monitoring the working power supply of the control loop ZJ and the TCJ relay;
the isolating knife switch restarting relay electricity-taking control loop comprises a ZJ relay, wherein the ZJ relay is an electric maintaining double-position relay, the relay is provided with two coils, one is an action coil ZJ-I, the other is a resetting coil ZJ-II, the electric maintaining double-position relay only works in one state, the normally closed contacts of 1YJJ1 and 1YJJ2 AB phases of the monitoring PT protection winding secondary voltage 1YJJ1 BC and 1YJJ2BC successive relay are connected with the normally closed contacts of 2YJJ1AB phases of the monitoring PT measurement winding secondary voltage 2YJJ1 BC and 2YJJ2BC successive 2YJJ1 and 2YJJ2 of the monitoring PT protection winding secondary voltage 1YJJ1AB phase and 1YJJ2BC successive 1YJJ1, 1YJJ2 normally open contacts of the monitoring PT measurement winding secondary voltage 2YJJ1AB phase and 2YJJ2BC successive 2YJJ1, the normally open contacts are connected in series to start the ZJ relay electricity-taking loop when the two normally closed contacts are connected in parallel, the normally open contacts of the two coils are controlled to work in the external power supply state, when the corresponding section bus is not pressed when the short lead corresponding circuit breaker is out of service, monitoring the secondary voltage 1YJJ1AB phase of the PT protection winding and the 1YJJ2BC relay are in low-voltage action, the normally closed contacts 1YJJ1 and 1YJJ2 are closed, the normally open contacts 1YJJ1 and 1YJJ2 are opened, monitoring the secondary voltage 2YJJ1AB phase of the PT metering winding and the normally closed contacts 2YJJ2BC relay are in under-voltage action, the normally closed contacts 2YJJ1 and 2YJJ2 are closed, the normally closed contacts 2YJJ1 and 2YJJ2 are opened, at the moment, the action coil of the ZJ relay is driven, the normally closed contacts ZJ are closed, the isolating switch is closed, the double-position heavy-action relay TCJ is operated to be negative, meanwhile, the electric signal action on ZJ is fed to a common measurement and control device, when the remote-closing contacts are opened under the working state, and the relay is kept in the action state when the remote-closing contacts are not closed, when the corresponding section bus is in the short lead, the corresponding circuit breaker is charged, the normally closed contacts 1YJJ1, JJ2 and 2 are returned to the voltage, 1YJJ1, 1YJJ2, 2YJJ1, 2YJJ2 normally open contacts are connected, 1YJJ1, 1YJJ2, 2YJJ1, 2YJJ2 normally closed contacts are disconnected, a ZJ relay reset coil is driven to act, the ZJ normally open contacts are disconnected, the ZJ normally closed contacts are connected, a relay TCJ working negative power supply is disconnected, meanwhile, a ZJ power-off signal acts to send a public measurement and control device, when a remote tapping point is disconnected in the working state, the remote tapping point is not closed, the relay is always kept in the reset state, and when the direct current power supply disappears in the operation, both coils of the relay are in power failure reset, and the relay TCJ working negative power supply is disconnected;
the short lead protection self-adaptive switching control loop comprises a switching control circuit: the device comprises a normally closed auxiliary contact at a single Ge position of a main transformer high-voltage side isolation disconnecting link, and is further added with a normally open auxiliary contact input from a Ge disconnecting link mechanism box to a protection room, wherein a magnetic latching double-position heavy-acting relay TCJ and single-position heavy-acting relays 1YQJ and 2YQJ are respectively started, the relay TCJ is used for controlling an external input auxiliary contact, and the relay TCJ contact is used as a short lead protection switching criterion; the relay 1YQJ and 2YQJ are used for monitoring the input contact state of the isolating switch and the secondary circuit in real time, the magnetic latching double-position double-acting relay TCJ is provided with two coils, one is an action coil TCJ-I, the other is a reset coil TCJ-II, the magnetic latching double-position relay only works in one state and keeps the original working state unchanged under the condition of power failure, when the direct current power supply works normally, the working state of the magnetic latching double-position relay is controlled by the external input contacts of the two coils, when the normally open auxiliary contact of the isolating switch Ge on the main high voltage side is closed, the normally closed auxiliary contact is opened, the action coil of the driving TCJ relay acts, the normally closed contact of the TCJ is opened, the normally closed auxiliary contact of the driving TCJ relay is closed, the reset coil acts, the TCJ normally closed contact is closed, the short-lead protection input is sent to the monitoring system for monitoring, and the normally open auxiliary contact of the normally open switch Ge 1 is opened when the normally open auxiliary contact of the isolating switch Ge on the main high voltage side is opened, the normally open auxiliary contact of the relay QJ 1 is opened, and the normally open auxiliary contact of the relay 2YQJ is opened, and the normally open contact of the normally open auxiliary contact is opened, and the normally open contact of the normally open switch is opened; when the Ge normally-closed auxiliary contact of the isolation disconnecting link is closed, 2YQJ acts, and when the Ge normally-closed auxiliary contact is opened, 2YQJ returns, and the restarting signals of the two restarting relays are sent to the monitoring system for monitoring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811127817.XA CN109193583B (en) | 2018-09-27 | 2018-09-27 | Control circuit for self-adaptive switching of inner bridge connection short lead protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811127817.XA CN109193583B (en) | 2018-09-27 | 2018-09-27 | Control circuit for self-adaptive switching of inner bridge connection short lead protection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109193583A CN109193583A (en) | 2019-01-11 |
| CN109193583B true CN109193583B (en) | 2024-03-26 |
Family
ID=64907266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811127817.XA Active CN109193583B (en) | 2018-09-27 | 2018-09-27 | Control circuit for self-adaptive switching of inner bridge connection short lead protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109193583B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111641194A (en) * | 2020-05-21 | 2020-09-08 | 南京国电南自电网自动化有限公司 | Circuit breaker protection device and method integrating short lead protection |
| CN115273361A (en) * | 2022-07-26 | 2022-11-01 | 中国南方电网有限责任公司超高压输电公司昆明局 | Misoperation monitoring method and device of air switch and computer equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08212880A (en) * | 1995-02-09 | 1996-08-20 | Meidensha Corp | Control circuit for circuit breaker |
| CN102436971A (en) * | 2011-04-27 | 2012-05-02 | 上海市电力公司 | Remote control on-off reclosing relay |
| CN104319889A (en) * | 2014-10-29 | 2015-01-28 | 国网河南省电力公司商丘供电公司 | Automatic throwing and exiting method for achieving protection along with operation of neutral point isolating switch |
| CN104332865A (en) * | 2014-07-01 | 2015-02-04 | 国家电网公司 | Typical wiring method for intelligent transformer station |
| CN105186451A (en) * | 2015-08-27 | 2015-12-23 | 南京国电南自电网自动化有限公司 | Inrush current lock self-adaptive switching method for earth fault in valve side region of converter transformer |
| CN209358241U (en) * | 2018-09-27 | 2019-09-06 | 国网福建省电力有限公司泉州供电公司 | A kind of internal bridge stub protection adaptively throws the control circuit moved back |
-
2018
- 2018-09-27 CN CN201811127817.XA patent/CN109193583B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08212880A (en) * | 1995-02-09 | 1996-08-20 | Meidensha Corp | Control circuit for circuit breaker |
| CN102436971A (en) * | 2011-04-27 | 2012-05-02 | 上海市电力公司 | Remote control on-off reclosing relay |
| CN104332865A (en) * | 2014-07-01 | 2015-02-04 | 国家电网公司 | Typical wiring method for intelligent transformer station |
| CN104319889A (en) * | 2014-10-29 | 2015-01-28 | 国网河南省电力公司商丘供电公司 | Automatic throwing and exiting method for achieving protection along with operation of neutral point isolating switch |
| CN105186451A (en) * | 2015-08-27 | 2015-12-23 | 南京国电南自电网自动化有限公司 | Inrush current lock self-adaptive switching method for earth fault in valve side region of converter transformer |
| CN209358241U (en) * | 2018-09-27 | 2019-09-06 | 国网福建省电力有限公司泉州供电公司 | A kind of internal bridge stub protection adaptively throws the control circuit moved back |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109193583A (en) | 2019-01-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2015158218A1 (en) | Motor restarting controller | |
| CN108565974B (en) | Self-powered remote failure protection method and system based on protection device | |
| CN102790426A (en) | Improved spare power source automatic switch method for single bus sectionalized operation of power substation | |
| CN109193583B (en) | Control circuit for self-adaptive switching of inner bridge connection short lead protection | |
| CN102801207A (en) | Backup auto-switching voltage loss start interlocking method for multi-power double-bus substation | |
| CN112491040A (en) | Automatic switching device for standby power supply line of superconducting cable and operation method thereof | |
| CN201549868U (en) | Low-voltage switch intelligent controller | |
| CN201374585Y (en) | Undisturbed stability control device | |
| CN209358241U (en) | A kind of internal bridge stub protection adaptively throws the control circuit moved back | |
| CN211405921U (en) | Power plant motor control device | |
| CN101826719A (en) | Trip-proof lockout microcomputer protection system | |
| CN109327014B (en) | method for preventing misoperation of dangerous pressing plate during regular detection of line relay protection | |
| KR100374988B1 (en) | Automatic closing circuit of CB | |
| CN112531882A (en) | Automatic switching system of alternating current ring network power supply and operation monitoring method thereof | |
| CN201797302U (en) | Protective device for lifting of heavy crown block | |
| CN218678427U (en) | Generator de-excitation loop | |
| TWI812416B (en) | An automatic sequence tripping and reclosing device | |
| CN111917104B (en) | Circuit for preventing misoperation of bus voltage parallel circuit | |
| CN207442525U (en) | A kind of MCC busbares Dual-power switching system | |
| CN111371069B (en) | Overtemperature protection device for transformer | |
| CN213547100U (en) | Bus voltage parallel loop based on intelligent operation and maintenance | |
| CN217387052U (en) | Direct-current main control brake-separating device of permanent-magnet circuit breaker | |
| CN220107565U (en) | Circuit for preventing circuit breaker control circuit disconnection false alarm | |
| CN214626487U (en) | Automatic switching system for alternating current ring network power supply | |
| CN218826923U (en) | Universal circuit breaker |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |