CN106159917B - Power distribution network indulges the relay protection system of sequence accelerated motion - Google Patents

Abstract

The invention relates to a relay protection system for vertical sequence acceleration action of a distribution network, which includes a power distribution station with dual power sources, all first bus outlet protection devices and all second bus outlet protection devices are connected with section switches The protection device is connected, the section switch protection device is connected with the section current transformer and the section switch; the three-phase current of the section bus on the section bus is obtained through the section current transformer, if at least one of the three-phase currents of the section bus When the phase exceeds the preset current setting value of the segmental bus longitudinal sequence protection in the segmental switch protection device, the segmental switch protection device will start timing, and after the segmental longitudinal sequence action long time limit t _ZXL , the segmental switch protection device will control The section switch is tripped. The invention has a compact structure, effectively shortens the action time of the internal fault main protection of the power distribution network, and solves the problem of difficult coordination of the relay protection setting time of the distribution network and the main network.

Description

Relay Protection System of Sequential Acceleration Action in Distribution Network

technical field

The invention relates to a relay protection system, in particular to a relay protection system for a longitudinal sequence acceleration action of a distribution network, which belongs to the technical field of relay protection of electric power systems.

Background technique

In order to reliably and selectively remove faults, power distribution stations are usually equipped with multiple relay protection devices. As shown in Figure 1, it is a typical protection device for an existing power distribution network, specifically, it includes a first incoming line 1, a first bus bar 9 connected to the first incoming line 1, a second incoming line 2, and the The second busbar 10 connected to the second incoming line 2 , the first busbar 9 and the second busbar 10 are connected through a segmented busbar 11 . The first incoming line current transformer 3 and the first incoming line switch 4 are arranged on the first incoming line 1, the first incoming line current transformer 3, the first incoming line switch 4 and the first incoming line protection device 7 Connection: A second incoming line current transformer 5 and a second incoming line switch 6 are arranged on the second incoming line 2 , and the second incoming line current transformer 5 and the second incoming line switch 6 are connected to the second conducting protection device 8 . A segment current transformer 13 and a segment switch 14 are arranged on the segment bus 11 , and the segment current transformer 13 and the segment switch 14 are connected to the segment switch protection device 12 .

Connect several first bus outlets 15 on the first bus 9, connect some second bus outlets 16 on the second bus 10, and first bus outlet current transformer 19 and first bus outlet current transformer 19 and first Bus outlet switch 18, the first bus outlet current transformer 19, the first bus outlet switch 18 are connected with the first bus outlet protection device 17 configured on the first bus outlet 15; Set the second bus outlet current transformer 22 and the second bus outlet switch 21, the second bus outlet switch 21, the second bus outlet current transformer 22 and the second bus outlet protection device 20 arranged on the second bus outlet 16 connect.

During work, the first bus outlet protection device 17 can control the switching state of the connected first bus outlet switch 18, and when the first bus outlet switch 18 is in a tripped state, the first bus outlet switch 18 where the first bus outlet switch 18 is located Bus outlet 15 stops power supply. Similarly, the second bus outlet protection device 20 can control the switch state of the connected second bus outlet switch 21 , and the section switch protection device 12 can control the switch state of the section switch 14 . The first incoming line protection device 7 can control the switching state of the first incoming line switch 4 , and the second incoming line protection device 8 can control the switching state of the second incoming line switch 6 .

Generally, in order to ensure the selectivity of the relay protection action, the first bus outlet protection device 17, the second bus outlet protection device 20, the section switch protection device 12, the first incoming line protection device 7 and the second incoming line protection device The 8 rooms should be configured according to the level difference. The action time of the first busbar outgoing protection device 17 and the second busbar outgoing line protection device 17 is the shortest, the action time of the section switch protection device 12 is second, the first is the protective device 7, and the second incoming line The action time of the protection device 8 is the longest. If failure occurs on the outgoing line side like this, then can make corresponding busbar outgoing line switch be in tripping state, prevent section switch 14, first incoming line switch 4 or second incoming line switch 6 from tripping and cause accident to expand. When the first incoming line 1 or the second incoming line 2 is out of service, the section switch 14 runs with the corresponding bus bar, and when the corresponding operating bus fails, the section switch 14 can be tripped first to prevent the non-stopped operation. The incoming line switch corresponding to the line tripped and caused the accident to expand.

If the protection setting is carried out according to the above requirements, assuming that the action time of the outlet protection device (the first bus outlet protection device 17 and the second bus outlet protection device 20) is set to t _f , then the action time of the section switch protection device 12 is set to t _f +Δt, the action time of the incoming line protection device (the first incoming line protection device 7 and the second incoming line protection device 8) is set to t _f +2Δt, where Δt is the level difference, recommended for the computerized relay protection device regulations Take 0.3 seconds. Assuming that the action time of the outgoing line protection device is 0 seconds, according to the differential configuration, the sub-section switch protection device 12 operates at least 0.3 seconds, and the incoming line protection device operates at least 0.6 seconds. This will cause the internal equipment of the power distribution station to fail. That is, the long action time of the incoming line protection device and the sub-section switch protection device 12) is not conducive to quick fault removal, but also increases the difficulty of cooperating with the relay protection setting of the main power grid, resulting in difficulty in setting.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, and provide a relay protection system for distribution network longitudinal acceleration action, which has a compact structure, effectively shortens the main protection action time for internal faults in power distribution stations, and solves the problem of It is difficult to coordinate the setting time of the relay protection of the grid and the main grid.

According to the technical solution provided by the present invention, the relay protection system for the vertical sequence acceleration action of the distribution network includes a power distribution station with dual power sources, and the power distribution station with dual power sources includes a first incoming line and a second incoming line. line; the first incoming line is connected to the first bus bar, the second incoming line is connected to the second bus bar, and the first bus bar is connected to the second bus bar through a segmented bus bar; there are several first bus bar outlet lines connected to the first bus bar, and the second bus bar is connected to the second bus bar. Several second bus outlets are connected to the second bus; a first incoming current transformer and a first incoming switch are arranged on the first incoming line, and a second incoming current transformer and a second incoming switch are arranged on the second incoming line; The first bus outlet current transformer, the first bus outlet switch and the first bus outlet protection device are installed on any first bus outlet, and the second bus outlet current transformer, the first bus outlet current transformer, and the second bus outlet are installed on any second bus outlet. The second bus outlet switch and the second bus outlet protection device, the section bus is equipped with section current transformers, section switches and section switch protection devices;

All the first bus outlet protection devices and all the second bus outlet protection devices are connected to the section switch protection device, and the section switch protection device is connected to the section current transformer and the section switch;

The segmented bus three-phase current on the segmented bus is obtained through the segmented current transformer, if at least one of the three-phase currents of the segmented bus exceeds the preset segmental bus longitudinal sequence protection current setting value in the segmented switch protection device , the subsection switch protection device performs timing, and after the long time limit t _ZXL of the subsection longitudinal sequence action, the subsection switch protection device controls the subsection switch to be in the tripping state.

If the first busbar outgoing protection device or/and the second busbar outgoing protection device transmit the outgoing line overcurrent protection signal to the section switch protection device, and at least one phase of the three-phase current of the section bus through the section current transformer exceeds the subsection When the setting value of the longitudinal sequence protection current of the sub-section busbar is preset in the switch protection device, the sub-section switch protection device will start timing, and after the short time limit t _ZXS of the sub-section longitudinal sequence action, the sub-section switch protection device will control the sub-section switch to be in Jump out of state.

The segmental bus longitudinal protection enabling signal is provided in the segmental switch protection device, and the segmental bus longitudinal protection enabling signal is in an effective enabling state, the first bus outlet protection device or/and the second bus outlet protection device When the outgoing line overcurrent protection signal is transmitted to the section switch protection device, and the three-phase current of the section busbar obtained through the section current transformer does not exceed the setting value of the section busbar longitudinal sequence protection current in the section switch protection device, after After the alarm delay time t _ZXG1 , the section switch protection device outputs a protection alarm signal, and closes the effective enabling state of the section bus longitudinal protection enabling signal;

After the section switch protection device turns off the section bus longitudinal protection enabling signal, if the first bus outlet protection device or/and the second bus outlet protection device transmit the outlet overcurrent protection signal to the section switch protection device, after reset After a time delay of t _ZXF1 , the section switch protection device makes the section bus longitudinal sequence protection enable signal re-enter the effective enable state.

The first incoming line is provided with a first incoming line protection device, and the section switch protection device, section switch and all first bus outlet line protection devices are connected to the first line entry protection device; the first line entry protection device Also connected with the first incoming line current transformer and the first incoming line switch;

At least one first bus outgoing line protection device transmits the first bus line outgoing line overcurrent protection signal to the first incoming line protective device, and at least one phase of the first incoming line three-phase current exceeds the first incoming line current transformer through the first incoming line current transformer. When the first incoming line protection current setting value is preset in the incoming line protection device, the first incoming line protection device will start timing, and after the incoming line sequence action time t _ZXS1 , the first incoming line protection device will control the first incoming line protection device One incoming line switch is in the state of tripping.

When the sub-section switch is in the tripped state, the first busbar is faulty, and all the first busbar outlet protection devices are refused to operate, at least one of the three-phase currents of the first incoming line obtained through the first incoming line current transformer exceeds the second When the first incoming line protection current setting value is preset in the first incoming line protection device, the first incoming line protection device will start timing, and after the incoming line longitudinal sequence action time t _ZXL1 , the first incoming line protection device will control The first incoming line switch is in a tripped state.

When the section switch is in the closed state and the second busbar is faulty, the section switch transmits the overcurrent protection signal of the section switch to the first incoming line protection device, and then the three-phase current of the first incoming line is obtained through the first incoming line current transformer. When at least one phase exceeds the preset first incoming line sequence protection current setting value in the first incoming line protection device, the first incoming line protection device will start timing, and after the incoming line sequence action time t _ZXS2 , the first incoming line protection device will The incoming line protection device controls the first incoming line switch to be in a tripping state.

When the section switch is in the closed state, and the section switch refuses to operate when the second busbar fails, at least one of the three-phase currents of the first incoming line obtained by the first incoming line current transformer exceeds the first incoming line protection device. When the preset current setting value of the first incoming line sequence protection is set, the first incoming line protection device will start timing, and after the incoming line sequence action time t _ZXL2 , the first incoming line protection device will control the first incoming line switch to be at Jump out of state.

In the first incoming line protection device, there is a first incoming line sequential protection enabling signal. When the first incoming line sequential protection enabling signal is in an effective enabling state, the first bus outlet protection device sends protection to the first incoming line. The device transmits the outgoing line overcurrent protection signal or/and the section switch protection device transmits the section busbar protection signal to the first incoming line protection device, and the three-phase current of the first incoming line obtained through the first incoming line current transformer does not exceed When the first incoming line protection current setting value is preset in the first incoming line protection device, the first incoming line protection device will start timing, and after the alarm delay t _ZXG2 , the first incoming line protection device will output an incoming line protection alarm signal, and close the effective enabling state of the first incoming line sequence protection enabling signal;

After the first incoming line protection device turns off the first incoming line sequence protection enable signal, the first bus outlet protection device transmits an outgoing line overcurrent protection signal to the first incoming line protection device or/and the section switch protection device sends the first incoming line protection signal to the first incoming line protection device. After the line protection device transmits the section busbar protection signal, after a reset delay t _ZXF2 , the first incoming line protection device makes the first incoming line sequence protection enable signal re-enter the effective enabling state.

Advantages of the present invention: all the first bus outlet protection device and the second bus outlet protection device are connected with the section switch protection device, and the first bus outlet protection device, section switch protection device and section switch are also connected with the first section switch protection device. The incoming line protection device is connected to effectively realize the switch state control of the section switch and the first incoming line switch, so that the internal fault main protection of the power distribution station can be effectively shortened without changing the structure of the existing distribution station. The action time solves the problem of difficulty in coordinating the relay protection setting time of the distribution network and the main network.

Description of drawings

Fig. 1 is a schematic diagram of the power supply and protection of the existing power distribution substation.

Figure 2 is a schematic diagram of the present invention.

Fig. 3 is another schematic diagram of the present invention.

Explanation of reference signs: 1-first incoming line, 2-second incoming line, 3-first incoming line current transformer, 4-first incoming line switch, 5-second incoming line current transformer, 6-the first incoming line Two incoming line switch, 7-first incoming line protection device, 8-second incoming line protection device, 9-first bus bar, 10-second bus bar, 11-section bus bar, 12-section switch protection device, 13 -Segmented current transformer, 14-Segment switch, 15-First bus outlet, 16-Second bus outlet, 17-First bus outlet protection device, 18-First bus outlet switch, 19-First bus outlet Current transformer, 20-second bus outlet protection device, 21-second bus outlet switch, 22-second bus outlet current transformer, 23-V+ signal positive power supply terminal in section switch protection device, 24-section bus Protection inner outgoing line protection over-current switch-in connection terminal, 25-inner light-emitting diode for subsection busbar protection, 26-V-signal negative power supply terminal in subsection switch protection device, 27-V+ signal positive power supply terminal in the first incoming line protection device , 28-the first incoming line protection device inner outgoing line protection overcurrent open-in connection terminal, 29-the first incoming line protection device first outgoing line protection light-emitting diode, 30-the first incoming line protection device inner V-signal negative power supply terminal , 31-the second outgoing line protection light-emitting diode in the first incoming line protection device, 32-the section busbar protection overcurrent switch input connection terminal in the first incoming line protection device, 33-the section switch light emission in the first incoming line protection device Diode and 34-the section switch in the first incoming line protection device opens into the connection terminal.

Detailed ways

The present invention will be further described below in conjunction with specific drawings and embodiments.

As shown in Figure 2: in order to effectively shorten the main protection action time of the internal fault of the power distribution network station, and solve the problem of difficult coordination of the relay protection setting time of the distribution network and the main network, the present invention includes a power distribution station with dual power sources, The power distribution network of the dual power supply includes a first incoming line 1 and a second incoming line 2; the first incoming line 1 is connected to the first bus 9, the second incoming line 2 is connected to the second bus 10, and the first The busbar 9 is connected to the second busbar 10 through the segmented busbar 11; the first busbar 9 is connected with a number of first busbar outlets 15, and the second busbar 10 is connected with a number of second busbar outlets 16; the first incoming line 1 is provided with a first The incoming line current transformer 3 and the first incoming line switch 4, the second incoming line current transformer 5 and the second incoming line switch 6 are arranged on the second incoming line 2; A bus outlet current transformer 19, a first bus outlet switch 18 and a first bus outlet protection device 17, any second bus outlet 16 are equipped with a second bus outlet current transformer 22, a second bus outlet switch 21 and a first bus outlet Second bus outlet protection device 20, section bus 11 is provided with section current transformer 13, section switch 14 and section switch protection device 12;

All the first busbar outlet protection devices 17 and all the second busbar outlet protection devices 20 are connected to the section switch protection device 12, and the section switch protection device 12 is connected to the section current transformer 13 and the section switch 14;

The segmented bus three-phase current on the segmented bus 11 is obtained through the segmented current transformer 13, if at least one of the three-phase currents of the segmented bus exceeds the segmented bus longitudinal sequence protection current preset in the segmented switch protection device 12 When the value is set, the section switch protection device 12 will start timing, and after the long time limit t _ZXL of the section longitudinal sequence action, the section switch protection device 12 will control the section switch 14 to be in the tripping state.

Specifically, the first incoming line 1 and the second incoming line 2 are connected to an external power supply, the first bus bar 9 is connected to one end of the first incoming line 1, and the second bus bar 10 is connected to one end of the second incoming line 2, The power supply state of the first incoming line 1 to the first bus bar 9 can be controlled through the first incoming line switch 4. When the first incoming line 4 is in the closed state, the first incoming line 1 can make the first bus bar 9 in a live running state , and when the first incoming line 4 is in the tripped state, the electrical connection between the first bus bar 9 and the first incoming line 1 can be disconnected, and the first bus bar 9 may be in a power-off state at this time. The coordination relationship among the second bus bar 10 , the second incoming line 2 and the second incoming line switch 6 is similar, and will not be repeated here. The first bus 9 and the second bus 10 are connected by a subsection bus 11. When the section switch 14 on the subsection bus 11 is in the state of jumping off, the first bus 9 and the second bus 10 are in an independent state. That is, the charging states of the first bus 9 and the second bus 10 are independent of each other; and when the section switch 14 on the section bus 11 is in a closed state, the charging states between the first bus 9 and the second bus 10 are in a synchronous state, At this time, the charged state of the first bus bar 9 is not only related to the switch state of the first incoming line 1 and the first incoming line switch 4, but also related to the switching state of the second incoming line 2 and the second incoming line switch 6, that is, the first The first bus 9 and the second bus 10 maintain the same electrified state or the same power-off state, and the electrified running state of the first bus 9 or the second bus 10 can be guaranteed at the same time through the first incoming line 1 or the second incoming line 10 .

During specific implementation, the first incoming line switch 4, the second incoming line switch 6, the section switch 14, the first busbar outgoing line switch 18 and the second busbar outgoing line switch 21 can all adopt the form of a relay, and the first incoming line switch 4 , the second incoming line switch 6, the section switch 14, the first busbar outgoing line switch 18 and the second busbar outgoing line switch 21 switch states to realize the control process of different charging states are well known to those skilled in the art, and will not be repeated here.

In the embodiment of the present invention, all the first bus outlet protection devices 17 and all the second bus outlet protection devices 20 are connected to the section switch protection devices 12, that is, any first bus outlet protection device 17 and any second bus outlet protection device 17 The two bus outlet protection devices 20 can all transmit the outlet overcurrent protection signal to the section switch protection device 12; the connection relationship between the first bus outlet protection device 17, the second bus outlet protection device 20 and the section switch protection device 12 can be as follows As shown in Figure 1, one end of all the first busbar outlet protection devices 17 and one end of the second busbar outlet protection device 20 are connected to the positive power supply terminal 23 of the V+ signal in the subsection switch protection device 12 in the subsection switch protection device. The other end of the first busbar outlet protection device 17 and the other end of the second busbar outlet protection device 20 are all connected to the connection terminal 24 of the inner outlet protection overcurrent switch of the section switch protection device, and the inner outlet protection device of the section switch protection device is connected to the overcurrent switch. The input connection terminal 24 is connected to the anode end of the light-emitting diode 25 in the section switch protection device, and the cathode end of the light-emitting diode 26 in the section switch protection device is connected to the V-signal negative power supply terminal 26 in the section switch protection device. When the bus outlet protection device 17 or the second bus outlet protection device 20 transmits the outlet overcurrent protection signal to the section switch protection device 12, the outlet overcurrent protection signal can be obtained through the light emitting diode 25 in the section switch protection device. , the first busbar outlet protection device 17, the second busbar outlet protection device 20 and the sectional busbar outlet protection device 12 can also adopt other connection and cooperation forms, as long as the overcurrent protection signal can be transmitted to the section switch protection device 12 That is, the details will not be listed one by one.

In the embodiment of the present invention, when the equipment in the substation fails, and when the failure occurs, neither the first bus outlet protection device 17 nor the second bus outlet protection device 20 transmits the outlet overcurrent protection to the section switch protection device 12 signal, the segmented bus three-phase current on the segmented bus 11 is obtained through the segmented current transformer 13, if at least one of the three-phase currents of the segmented bus exceeds the preset segmented bus longitudinal in the segmented switch protection device 12 When the sequence protection current setting value is reached, the subsection switch protection device 12 will start timing, and after the subsection longitudinal sequence action long time limit _tZXL , the subsection switch protection device 12 will control the subsection switch 14 to be in the tripping state. In specific implementation, the segmental longitudinal action long time limit t _ZXL is formed according to the overcurrent action time of the outgoing line protection plus the necessary time margin, and at the same time considering the function failure caused by the abnormality, it is recommended to take out the longest action setting time of the line protection plus a 150ms delay. The specific values of the segmental bus longitudinal protection current setting value, outgoing line protection overcurrent action time, and outgoing line protection longest action setting time are related to the site environment, and are well known to those skilled in the art, and will not be repeated here.

Further, if the first bus outlet protection device 17 and/or the second bus outlet protection device 20 transmit an outlet overcurrent protection signal to the section switch protection device 12, and obtain the section bus three-phase current through the section current transformer 13 When at least one of the phases exceeds the setting value of the longitudinal sequence protection current of the segmental busbars preset in the segmental switch protection device 12, the segmental switch protection device 12 will start timing, and after the short time limit t _ZXS of the segmental longitudinal sequence action, the segmental switch protection device 12 will The section switch protection device 12 controls the section switch 14 to be in a tripping state.

In the embodiment of the present invention, the short time limit t _ZXS of segmental longitudinal sequence action is composed of the longest action setting time of outgoing line protection, the exit time of outgoing line protection action, the longest operating time of circuit breaker and the necessary time margin. It is recommended that the longest line protection Action setting time plus 100 millisecond delay; the specific values corresponding to the longest action setting time of outgoing line protection, the action exit time of outgoing line protection, and the longest operating time of circuit breaker are well known to those skilled in the art, and will not be repeated here.

Further, the section switch protection device 12 is provided with a section bus longitudinal protection enabling signal, and when the section bus longitudinal protection enabling signal is in an effective enable state, the first bus outlet protection device 17 or/and the second The second bus outgoing protection device 20 transmits the outgoing line overcurrent protection signal to the section switch protection device 12, and obtains the section bus three-phase current through the section current transformer 13 without exceeding the section bus in the section switch protection device 12 When the longitudinal sequence protection current is set, after the alarm delay _tZXG1 , the section switch protection device 12 outputs a protection alarm signal, and closes the effective enabling state of the section bus sequence protection enabling signal;

After the section switch protection device 12 turns off the section bus longitudinal protection enabling signal, if the first bus outlet protection device 17 or/and the second bus outlet protection device 20 transmit the outlet overcurrent protection signal to the section switch protection device 12 Afterwards, after a reset delay time t _ZXF1 , the section switch protection device 12 makes the section bus sequence protection enable signal re-enter the valid enabling state.

In the embodiment of the present invention, in order to prevent the misoperation of the first bus outlet protection device 17 or the second bus outlet protection device 18, resulting in miscontrol of the section switch protection device 12 on the section switch 14, the section switch protection device 12 on The real-time logic detection of the outgoing line overcurrent protection signal input by the first bus outgoing line protection device 17 and the second bus line outgoing line protection device 20 . During specific implementation, when the effective enabling state of the segmental bus longitudinal protection enabling signal is turned off, the segmental switch protection device 12 cannot be controlled according to the first bus outlet protection device 17, the second bus outlet protection device 20 and the current mutual inductance through the segment. The controller 13 obtains the relationship between the three-phase current of the segmental busbar and the preset segmental busbar longitudinal sequence protection current setting value in the segmental switch protection device 12, and controls the switching state of the segmental switch 14, that is, at this time, the segmental switch 14 The switching state of the switch is not controlled by the above conditions. Specific values of the alarm delay t _ZXG1 and the reset delay t _ZXF1 can be selected according to needs, and generally can be determined as 15 seconds.

As shown in Figure 2, the first incoming line protection device 7 is provided on the first incoming line 1, and the section switch protection device 12, the section switch 14 and all the first bus outlet line protection devices 17 are connected with the first line entry protection device. The line protection device 7 is connected; the first incoming line protection device 7 is also connected with the first incoming line current transformer 3 and the first incoming line switch 4;

At least one first bus outgoing line protection device 17 transmits the first bus line outgoing line overcurrent protection signal to the first incoming line protection device 7, and obtains at least one phase of the first incoming line three-phase current through the first incoming line current transformer 3 When the current setting value of the first incoming line sequence protection preset in the first incoming line protection device 7 is exceeded, the first incoming line protection device 7 will perform timing, and after the incoming line sequence action time t _ZXS1 , the first incoming line protection device 7 will The line protection device 7 controls the first incoming line switch 4 to be in a tripped state.

In the embodiment of the present invention, the sectional switch protection device 12, the sectional switch 14, and all the first bus outlet protection devices 17 are connected to the first incoming line protection device 7, and the first incoming line protection device 7 is used to control the first incoming line protection device. The switching status of the line switch 4 can further ensure the power supply safety of the distribution substation. The connection and coordination relationship between the section switch protection device 12, the section switch 14 and all the first bus outlet protection devices 17 and the first incoming line protection device 7 is specifically:

One end of all the first bus outlet protection devices 17, one end of the section switch protection device 12 and one end of the section switch 14 are connected to the V+ signal positive power supply terminal of the first line protection device in the first line protection device 7 , the other ends of all the first bus outlet protection devices 17 are connected to the first incoming line protection device inner outlet protection overcurrent open connection terminal 28, and the first incoming line protection device inner outlet protection overcurrent open connection terminal 28 is connected to the first The anode end of the first outgoing line protection light emitting diode 29 in the incoming line protection device is connected, and the cathode end of the first outgoing line protection light emitting diode 29 in the first incoming line protection device is connected to the V-signal negative power supply terminal 30 in the first incoming line protection device , the other end of the sectional switch protection device 12 is connected to the sectional switch protection overcurrent input connection terminal 32 in the first incoming line protection device, and the sectional switch protection overcurrent input connection terminal 32 in the first incoming line protection device is connected to the The anode end of the second outgoing line protection light emitting diode 31 in the first incoming line protection device is connected, the cathode end of the second outgoing line protection light emitting diode 31 in the first incoming line protection device is connected to the V- signal negative power supply terminal in the first incoming line protection device 30 connection; that is, through the first outgoing line protection light-emitting diode 29 in the first incoming line protection device, the corresponding first busbar outgoing line protection device 17 transmits the outgoing line overcurrent protection signal to the first incoming line protection device 7, and through the first incoming line protection The second outgoing line protection light emitting diode 31 in the device realizes that the section switch protection device 12 transmits the section bus overcurrent protection signal to the first incoming line protection device 7 .

The other end of the segment switch 14 is connected to the segment switch position open-in connection end 34 in the first incoming line protection device, and the segment switch position open-in connection end 34 in the first incoming line protection device is connected to the first incoming line protection device. The anode end of the section switch light emitting diode 33 is connected, and the cathode end of the section switch light emitting diode 33 in the first incoming line protection device is connected with the V-signal negative power supply terminal 30 in the first incoming line protection device, through the first incoming line protection The section switch light emitting diode 33 in the device can realize the transmission of the section switch overcurrent protection signal from the section switch 14 to the first incoming line protection device 7 .

In specific implementation, other forms of connection and cooperation between the first bus outlet protection device 17, section switch protection device 12, and section switch 14 and the first incoming line protection device 7 can also be adopted, as long as the relevant signal input can be satisfied. That's it, no more details here.

In the embodiment of the present invention, when the equipment connected to the first bus 9 fails, the corresponding first bus outgoing protection device 17 will transmit the outgoing line overcurrent protection signal to the first incoming line protection device 7. At the same time, through the first When the current transformer 3 of an incoming line obtains at least one phase of the three-phase current of the first incoming line exceeding the setting value of the first incoming line sequence protection current preset in the first incoming line protection device 7, the first incoming line protection device 7 Timing is performed, and after the incoming line sequence action time t _ZXS1 passes, the first incoming line protection device 7 controls the first incoming line switch 4 to be in a tripping state. The current setting value of the first incoming line longitudinal sequence protection can be set according to the needs, the incoming line longitudinal sequence action time t _ZXS1 is set according to the longest action setting time of the outgoing line protection, and the action time of the first bus outgoing line protection device 17 when performing the outgoing line overcurrent protection , The maximum action time of the circuit breaker and the necessary time margin are composed. It is recommended to take out the longest action setting time of the line protection plus a delay of 100 milliseconds.

Further, when the subsection switch 14 is in the tripped state, the first bus bar 9 fails, and all the first bus bar outlet protection devices 17 refuse to operate, then the first incoming line current transformer 3 is used to obtain the first incoming line three-phase When at least one phase of the current exceeds the setting value of the first incoming line sequence protection current preset in the first incoming line protection device 7, the first incoming line protection device 7 will perform timing, and after the incoming line sequence action time t _ZXL1 Afterwards, the first incoming line protection device 7 controls the first incoming line switch 4 to be in a tripping state.

In the embodiment of the present invention, all the first bus outlet protection devices 17 refuse to operate, which means that when the first bus 9 fails and there is an outlet overcurrent, the first bus outlet protection device 17 cannot control the corresponding first bus outlet protection switch. 18 is tripped, and the outgoing line overcurrent protection signal cannot be transmitted to the section switch protection device 12 and the first incoming line protection device 7 . The longitudinal action time of the incoming line t _ZXL1 is composed of the action time of the outgoing line overcurrent protection contact plus the necessary time margin. Considering that the opening and entering circuit may be abnormal and cause functional failure, it is recommended that the longest action setting time of the outgoing line protection plus a delay of 150 milliseconds.

When the section switch 14 is in the closed state and the second bus bar 10 fails, the section switch 14 transmits the section switch overcurrent protection signal to the first incoming line protection device 7, and then the first incoming line current transformer 3 is used to obtain the first incoming line. When at least one phase of the three-phase current of the line exceeds the setting value of the first incoming line sequence protection current preset in the first incoming line protection device 7, the first incoming line protection device 7 will perform timing and act after passing through the incoming line sequence sequence. After the time _tZXS2 , the first incoming line protection device 7 controls the first incoming line switch 4 to be in a tripped state.

In the embodiment of the present invention, when the section switch 14 is in the closed state and the second bus bar 10 fails, the fault current flows through the section switch 14. At this time, the section switch 14 can supply the section switch protection device 12 and the first The incoming line protection device 7 transmits the section switch overcurrent protection signal. At the same time, at least one of the three-phase currents of the first incoming line obtained by the first incoming line current transformer 3 exceeds the preset value in the first incoming line protection device 7. When the current setting value of the first incoming line sequence protection is set, the first incoming line protection device 7 will perform timing, and after the incoming line sequence action time t _ZXS2 , the first incoming line protection device 7 will control the first incoming line switch 4 is in a skipped state. During specific implementation, when the section switch protection device 12 receives the section switch overcurrent protection signal transmitted by the section switch 14, it can control the section switch 14 to be in a tripping state. The longitudinal sequence action time t _{of the} incoming line is composed of the longest action setting time of the section switch protection, the exit time of the section switch protection action (action time of the section switch), the longest action time of the circuit breaker and the necessary time margin. It is recommended Take the longest action setting time of section switch protection plus 100 milliseconds delay.

When the section switch 14 is in the closed state, when the second bus bar 10 fails, the section switch 14 refuses to move, and at least one phase of the three-phase current of the first incoming line is obtained by the first incoming line current transformer 3 exceeding the first incoming line current. When the first incoming line protection current setting value is preset in the line protection device 7, the first incoming line protection device 7 will start timing, and after the incoming line sequence action time t _ZXL2 , the first incoming line protection device 7 will Control the first incoming line switch 4 to be in a tripped state.

In the embodiment of the present invention, the section switch 14 refuses to move specifically means that when the section switch 14 flows through the fault current, the section switch protection device 12 cannot control the section switch 14 to be in the tripping state, and cannot move to the first step. The line protection device 7 transmits the section switch overcurrent protection signal. At this time, at least one of the three-phase currents of the first incoming line obtained by the first incoming line current transformer 3 exceeds the first preset value in the first incoming line protection device 7. When the incoming line sequence protection current setting value is reached, the first incoming line protection device 7 will perform timing, and after the incoming line sequence action time t _ZXL2 , the first incoming line protection device 7 will control the first incoming line switch 4 to trip state. The longitudinal sequence action time t _ZXL2 of the incoming line is composed of the action time of the overcurrent contact of the sub-section switch plus the necessary time margin. It is recommended to take the longest action setting time of the sub-section switch protection plus a delay of 150 milliseconds.

The first incoming line protection device 7 is provided with a first incoming line sequence protection enabling signal, and when the first incoming line sequence protection enabling signal is in an effective enabling state, the first bus outlet protection device 17 will send a signal to the first incoming line protection device 7. The line protection device 7 transmits the outgoing line overcurrent protection signal or/and the sectional switch protection device 12 transmits the sectional busbar protection signal to the first incoming line protection device 12, and obtains the first incoming line 3 through the first incoming line current transformer 3 When none of the phase currents exceeds the setting value of the first incoming line sequence protection current preset in the first incoming line protection device 7, the first incoming line protection device 7 will start timing, and after the alarm delay t _ZXG2 , the first incoming line protection device 7 will The line protection device 7 outputs an incoming line protection alarm signal, and closes the effective enabling state of the first incoming line sequence protection enabling signal;

After the first incoming line protection device 7 turns off the first incoming line sequence protection enabling signal, the first bus outgoing line protection device 17 transmits the outgoing line overcurrent protection signal or/and section switch protection device 12 to the first incoming line protection device 7 After transmitting the segmented bus protection signal to the first incoming line protection device 7, after a reset delay _tZXF2 , the first incoming line protection device 7 makes the first incoming line sequential protection enabling signal re-enter the valid enabling state.

In the embodiment of the present invention, by controlling the use status of the first incoming line longitudinal protection enabling signal, it is avoided that the second The miscontrol of the first incoming line switch 4 by the incoming line protection device 7 ensures the power supply reliability of the power distribution network.

In specific implementation, for the second incoming line protective device 8, all the second busbar outgoing line protective devices 20, section switch protection devices 12 and section switch 14 are connected to the second incoming line protection device 8, and the second incoming line For the process of the protection device 8 controlling the switching state of the second incoming switch 6, reference may be made to the above description, and details will not be repeated here.

All of the first bus outlet protection device 17 and the second bus outlet protection device 20 of the present invention are connected with the section switch protection device 12, and the first bus outlet protection device 17, the section switch protection device 12 and the section switch 14 are also connected. Connect with the first incoming line protection device 7, and then effectively realize the switching state control of the section switch 14 and the first incoming line switch 4, thereby effectively shortening the distribution network without changing the structure of the existing distribution station. The action time of the main protection for internal faults in the station solves the problem of difficult coordination of the relay protection setting time of the distribution network and the main network.

Claims (7)

1. A relay protection system for distribution network longitudinal acceleration action, including a power distribution station with dual power sources, and the power distribution station with dual power sources includes a first incoming line (1) and a second incoming line (2 ); the first incoming line (1) is connected to the first busbar (9), the second incoming line (2) is connected to the second busbar (10), and the first busbar (9) passes through the segmented busbar (11) and The section switch (14) is connected to the second busbar (10); the first busbar (9) is connected with several first busbar outgoing lines (15), and the second busbar (10) is connected with several second busbar outgoing lines (16); The first incoming line current transformer (3) and the first incoming line switch (4) are set on the first incoming line (1), and the second incoming line current transformer (5) and the second incoming line switch (4) are set on the second incoming line (2). The second incoming line switch (6); the first bus bar outgoing line current transformer (19), the first bus bar outgoing line switch (18) and the first bus bar outgoing line protection device (17) are installed on any first bus bar outgoing line (15) , any second bus outlet (16) is equipped with a second bus outlet current transformer (22), a second bus outlet switch (21) and a second bus outlet protection device (20), and the segmented busbar (11) There are section current transformers (13), section switches (14) and section switch protection devices (12); the features are: All the first busbar outlet protection devices (17) and all the second busbar outlet protection devices (20) are connected to the section switch protection device (12), and the section switch protection device (12) is connected to the section current transformer ( 13) and section switch (14) connection; The segmented bus three-phase current on the segmented bus (11) is obtained through the segmented current transformer (13). If at least one of the three-phase currents of the segmented bus exceeds the When the section bus longitudinal sequence protection current setting value is reached, the subsection switch protection device (12) will start timing, and after the subsection longitudinal sequence action long time limit t _ZXL , the subsection switch protection device (12) will control the subsection switch (14) in a state of jumping off; Wherein, the first incoming line (1) is provided with a first incoming line protection device (7), a segment switch protection device (12), a segment switch (14) and all first bus outlet protection devices (17 ) are connected to the first incoming line protection device (7); the first incoming line protection device (7) is also connected to the first incoming line current transformer (3) and the first incoming line switch (4); At least one first bus outlet protection device (17) transmits the first bus outlet overcurrent protection signal to the first incoming line protection device (7), and the first incoming line current transformer (3) obtains the first incoming line three When at least one of the phase currents exceeds the preset first incoming line sequence protection current setting value in the first incoming line protection device (7), the first incoming line protection device (7) will time and After the sequence action time t _ZXS1 , the first incoming line protection device (7) controls the first incoming line switch (4) to be in the tripping state. 2. The relay protection system for longitudinal sequence acceleration action of distribution network according to claim 1, characterized in that: if the first bus outlet protection device (17) and/or the second bus outlet protection device (20) The section switch protection device (12) transmits the outgoing line overcurrent protection signal, and at least one phase of the three-phase current of the section busbar exceeds the section preset in the section switch protection device (12) through the section current transformer (13). When the busbar longitudinal sequence protection current setting value is reached, the subsection switch protection device (12) will start timing, and after the subsection longitudinal sequence action short time limit t _ZXS , the subsection switch protection device (12) will control the subsection switch (14) to be at Jump out of state. 3. The relay protection system for longitudinal sequence acceleration action of distribution network according to claim 2, characterized in that: an enabling signal for segmental bus longitudinal protection is provided in the segmental switch protection device (12), The enable signal of the section bus longitudinal protection is in the effective enable state, and the first bus outlet protection device (17) or/and the second bus outlet protection device (20) transmit the outlet overcurrent protection signal to the section switch protection device (12) , and none of the three-phase currents of the segmented bus obtained through the segmented current transformer (13) exceeds the setting value of the segmented bus longitudinal sequence protection current in the segmented switch protection device (12), after the alarm delay t _ZXG1 , the section switch protection device (12) outputs a protection alarm signal, and closes the effective enabling state of the section bus longitudinal protection enabling signal; After the subsection switch protection device (12) turns off the enable signal of the subsection bus longitudinal protection, if the first bus outlet protection device (17) or/and the second bus outlet protection device (20) send the subsection switch protection device ( 12) After transmitting the outgoing line overcurrent protection signal, after the reset delay t _ZXF1 , the section switch protection device (12) makes the section bus longitudinal protection enable signal re-enter the effective enable state. 4. The relay protection system for distribution network longitudinal acceleration action according to claim 1, characterized in that: when the section switch (14) is in the state of tripping, the first bus (9) fails, and all the first busbars (9) fail If all the protective devices (17) of the first incoming line refuse to operate, at least one phase of the three-phase current of the first incoming line obtained through the first incoming line current transformer (3) exceeds the preset value in the first incoming line protective device (7). When the first incoming line sequence protection current setting value is reached, the first incoming line protection device (7) will start timing, and after the incoming line sequence action time t _ZXL1 , the first incoming line protection device (7) will control the first incoming line protection device (7). Line switch (4) is tripped. 5. The relay protection system for longitudinal sequence acceleration action of distribution network according to claim 1, characterized in that: when the section switch (14) is in the closed state and the second busbar (10) fails, the section switch (14) ) to the first incoming line protection device (7) to transmit the section switch overcurrent protection signal, then through the first incoming line current transformer (3) to obtain at least one phase of the first incoming line three-phase current exceeding the first incoming line protection When the first incoming line protection current setting value is preset in the device (7), the first incoming line protection device (7) will start timing, and after the incoming line sequence action time t _ZXS2 , the first incoming line protection The device (7) controls the first incoming line switch (4) to be in a tripped state. 6. The relay protection system for distribution network longitudinal acceleration action according to claim 1, characterized in that: when the section switch (14) is in the closed state, when the second bus (10) fails, the section switch (14) If it refuses to move, at least one of the three-phase currents of the first incoming line obtained through the first incoming line current transformer (3) exceeds the first incoming line longitudinal sequence preset in the first incoming line protection device (7) When the protection current is set, the first incoming line protection device (7) will start timing, and after the incoming line sequence action time t _ZXL2 , the first incoming line protection device (7) will control the first incoming line switch (4) to Jump out of state. 7. The relay protection system for longitudinal sequence acceleration action of distribution network according to claim 1, characterized in that: the first incoming line sequential protection enabling signal is provided in the first incoming line protection device (7), When the enabling signal of the first incoming line sequence protection is effectively enabled, the first bus outlet protection device (17) transmits the outgoing line overcurrent protection signal or/and section switch protection device to the first incoming line protection device (7) (12) Transmit the segmental busbar protection signal to the first incoming line protection device (12), and none of the three-phase currents of the first incoming line obtained through the first incoming line current transformer (3) exceeds the first incoming line protection device (7) When the preset current setting value of the first incoming line sequence protection is set, the first incoming line protection device (7) will start timing, and after the alarm delay t _ZXG2 , the first incoming line protection device (7) will output the incoming line Line protection alarm signal, and close the effective enabling state of the first incoming line sequence protection enabling signal; After the first incoming line protection device (7) turns off the first incoming line sequence protection enabling signal, the first bus outlet protection device (17) transmits an outgoing line overcurrent protection signal to the first incoming line protection device (7) or/and After the section switch protection device (12) transmits the section busbar protection signal to the first incoming line protection device (7), after a reset delay t _ZXF2 , the first incoming line protection device (7) makes the first incoming line longitudinal sequence The protection enable signal re-enters the active enable state.