NB/T 10192-2019Technical guide for current blocking busbar protection (English PDF)

3.1 Main power supply bay

Independent power interval for supplying power to load or bus during normal operation.

3.2 Non-main power supply bay

Other intervals besides the main power supply interval on the bus of the substation, including feeder interval, capacitor interval, section interval and small power source interval Wait.

3.3 Current blocking busbar protection

Take the main power supply interval over-current start as the judgment condition, and combine with the blocking signal of the busbar non-main power supply interval to realize the bus fault identification And fast isolation protection.

5.1 Environmental conditions

5.1.1 Normal working atmospheric conditions

The requirements for normal working atmosphere are as follows.

a) Ambient temperature. -10 °C~55 °C;

b) Relative humidity. 5% to 95% (there is neither condensation nor freezing inside the device);

c) Atmospheric pressure. 80 kPa~106 kPa.

5.1.2 Reference test atmospheric conditions

The atmospheric conditions of the benchmark test are as follows.

a) Ambient temperature. 20 °C±5 °C;

b) Relative humidity. 45%~75%;

c) Atmospheric pressure. 86 kPa~106 kPa.

5.1.3 Environmental conditions for storage and transportation

The storage and transportation environment requirements are as follows.

a) The storage environment temperature is -25 °C~55 °C, and the relative humidity is not more than 85%;

b) The transportation environment temperature is -25 °C~70 °C, and the relative humidity is not more than 85%.

5.1.4 Surrounding environment

The surrounding environment should also meet the following requirements.

a) When the device is installed, there should be no vibration that exceeds the severity level 1 specified in GB/T 11287 at the place of use.

Impacts and collisions that exceed the severity level 1 specified in GB/T 14537;

b) The place of use should be free of explosive substances, and there should be no serious molds;

c) All reliable grounding points at the installation site shall meet the requirements of 5.8 in GB/T 2887-2011.

5.1.5 Special environmental conditions

When the environmental conditions specified in 5.1.1 ~ 5.1.4 are exceeded, it is determined by the user and the manufacturer.

5.2 Rated electrical parameters

5.2.1 DC working power supply

The DC working power supply of the device shall meet the following requirements.

a) Rated voltage. 220 V, 110 V;

b) Allowable deviation. -20%~15%;

c) Ripple coefficient. not more than 5%.

5.2.2 Incentive

The excitation amount of the device shall meet the requirements of 4.2.2 in DL/T 478-2013.

5.3 Accuracy and variation

The accuracy and variation of the device should comply with the regulations in DL/T 478-2013 4.3.

5.4 Switch input and output

The switch input and output of the device shall comply with the provisions of DL/T 478-2013 in 4.5.

5.5 Overload capacity

The overload capacity of the device shall meet the requirements of 4.6 in DL/T 478-2013.

5.6 Power consumption

The power consumption of the AC circuit of the device shall comply with the regulations in 4.7 of DL/T 478-2013.

5.7 Mechanical requirements

5.7.1 Structure and appearance

5.7.1.1 The structure and appearance of the device shall meet the requirements of 4.10.1 in DL/T 478-2013.

5.7.1.2 The nameplate of the device should contain an identification code representing the device.

5.7.2 Device housing

The enclosure of the device shall meet the requirements of 4.10.2 in DL/T 478-2013.

5.7.3 Grounding

The grounding of the device shall meet the requirements of 4.10.3 in DL/T 478-2013.

5.7.4 Mechanical vibration, shock and collision requirements

The mechanical vibration, shock and collision performance of the device should meet the requirements of 4.10.4 in DL/T 478-2013.

5.8 Insulation requirements

The insulation performance of the device should meet the requirements of 4.9 in DL/T 478-2013.

5.9 EMC requirements

The electromagnetic compatibility performance of the device should meet the requirements of 4.8 in DL/T 478-2013.

5.10 Safety requirements

The safety performance of the device should be able to meet the requirements of Chapter 6 of DL/T 478-2013.

5.11 Continuous power-on

After the device has been debugged, it shall be subjected to continuous energization test according to 7.13 of DL/T 478-2013.

5.12 Humidity and heat resistance

The device shall meet the damp and heat resistance test requirements specified in 7.3.8 and 7.3.9 of DL/T 478-2013.

5.13 Record function

5.13.1 The device shall have a fault record function, and keep more than 8 latest operation reports. Each action report should include the input mode The pseudo quantity and switch quantity, output switch quantity, action element, and action time shall contain at least 2 cycles before the failure and 6 cycles after the failure.

The recording resolution is not less than 20 points/week, providing comprehensive data information for analyzing protection actions, and can be output in COMTRADE data format Out.

5.13.2 The device should be able to record the change of fixed value, pressing plate operation, protection action information, alarm information and external switch value changes in chronological order. Bit information.

5.13.3 The device record should not be lost when the DC power supply fails. The fault information record shall be overwritten in chronological order and shall not be deleted manually. except.

5.14 Time synchronization function

5.14.1 The device should have a time synchronization interface.

5.14.2 The device should have a hardware clock circuit, and the hardware clock should work normally when the device loses DC power.

5.14.3 The accuracy of the device clock. 24 h does not exceed ±5 s; after clock synchronization, the error does not exceed ±1 ms.

5.15 Communication function

The device shall have the function of information interaction with the monitoring system.

5.16 Print function

The device should be capable of printing.

6.1 Composition of busbar protection

The busbar protection is composed of two parts. the discrimination element and the blocking element. The blocking element is used to identify the interval failure of the non-main power supply.

After the source interval fails, the blocking signal will be sent to the discrimination element to block the bus protection instantly. The discrimination component combines the blocking signal to identify the bus fault, And drive the corresponding export according to the discrimination result. Locking elements with small power supply and segmented intervals should be provided with directions, and locking elements with other intervals can be without squares.

Direction, the discrimination element can be blocked by the voltage element.

Refer to Appendix A for bus protection configuration and the relationship between the blocking element and the discrimination element.

6.2 Locking element

6.2.1 Blocking bus protection signal

Locking components are set at intervals of non-main power supply, which can be switched on and off by the control word. When any phase overcurrent of the non-main power supply interval protection starts, The interval protection of non-main power supply instantaneously outputs the "blocking bus protection" signal. If the fault disappears, the blocking signal will be recovered instantly; any over-current protection After the protection action, if the fault does not disappear, the blocking signal will be recovered after a fixed delay.

For conventional substations, the "blocking bus protection" signal can be hard contact output or communication transmission (such as GOOSE at the station control layer) signal). For smart substations, the "blocking bus protection" signal is the GOOSE signal, which is transmitted to the judge through the process layer network or the station control layer network. Other components.

For small power supply and segment intervals, the blocking element should be a directional overcurrent element.

6.2.2 Blocking signal disconnection processing

When the blocking signal is transmitted by communication, the protection may lose its selectivity when the link that transmits the blocking signal is disconnected.

Set the non-main power supply interval blocking signal broken link alarm function, when any blocking signal is broken, the bus protection is blocked.

6.2.3 Inconsistent maintenance

When the "blocking bus protection" signal is transmitted by communication, when the inspection status of the device where the discrimination component and the blocking component are inconsistent The bus protection should be alarmed but not blocked.

6.3 Discriminating components

The identification component combines the main power supply interval protection phase overcurrent start (can be blocked by the voltage component) and the blocking signal from the non-main power supply interval Identify bus failures.

6.4 Protection action logic

When there is no small power supply and section interval, or the blocking elements of the small power supply and section interval protection both have directions, the current element of the main power supply interval After the component meets the operating conditions and does not receive the blocking signal, it starts to count, and the busbar protection operates after the delay time to switch to the main power supply.

When the blocking element of the small power supply or section interval protection does not have a direction, the busbar protection does not pass the blocking signal of the small power supply or section interval protection Confirm that the current components of the main power supply interval meet the operating conditions and start timing after not receiving the blocking signal of other intervals. The busbar protection is the first The time limit outlet jumps to a small power source or segment interval without direction, and the second time limit outlet jumps to the main power supply.

When the busbar protection is realized by an independent device, it can integrate the action of the main power supply interval current components of each busbar at the voltage level and the non-main power supply Source interval blocking signal realizes protection action logic based on multiple interval information.

6.5 Action and alarm signal

The busbar protection shall have the busbar protection action signal and the blocking signal for long-term alarm. When the blocking signal is transmitted by communication Lock signal broken link alarm and maintenance inconsistency alarm.

6.6 Pressure plate setting

The pressure plate should be thrown and retracted at intervals on the device where the discrimination element is located. When the interval pressure plate is turned on, the interval blocking signal participates in the bus Protection logic; when the bay pressing plate exits, the bay blocking signal does not participate in the bus protection logic.

6.7 Performance Index

6.7.1 Technical requirements

Performance indicators should meet the following requirements.

a) Current setting error. the action accuracy error does not exceed ±5% or the absolute error does not exceed 0.02IN (rated current);

b) Voltage setting error. the error of the action accuracy does not exceed ±5% or the absolute error does not exceed 0.002UN (rated voltage);

c) Busbar protection delay error. under the condition of 1.2 times the busbar overcurrent setting value, it does not exceed ±1% or ±40 ms.

d) The inherent action delay of the blocking signal. Under the condition of 1.2 times the phase overcurrent setting value, the time of sending the blocking signal is not more than 40 ms.

e) The return delay error of the blocking signal is not more than 40 ms.

6.7.2 Blocking signal transmission requirements

When the blocking signal is transmitted by communication, the total transmission time of the blocking signal should not be greater than 20 ms.

7.1 Test conditions

7.1.1 Unless otherwise specified, all tests shall be carried out under the atmospheric conditions of the reference test specified in 5.1.2.

7.1.2 The device under test and the tester should be well grounded.

7.1.3 Unless otherwise specified, the surrounding environment should meet the requirements specified in 5.1.4.

7.2 Test system

Use the test system shown in Appendix B to test the protection function.

7.3 Test items and test methods

7.3.1 Blocking signal action and return

Simulate feeder faults respectively, and test the action and return of the blocking signal should meet the requirements of 6.2.1.

The feeder interval overcurrent protection is activated, and check whether the blocking signal of the feeder interval protection is issued;

When the fault is removed, check whether the blocking signal of the feeder bay protection returns;

After the feeder bay protection is activated, the fault has not disappeared. Check whether the feeder bay protection blocking signal returns.

7.3.2 Network disconnection Simulate the network disconnection, and then simulate the busbar fault, the busbar protection should be reliably blocked and should not malfunction.

7.3.3 Inconsistent maintenance

The simulation judges that the maintenance status of the device where the component and the locking component are inconsistent, and check whether the busbar protection issues an inconsistent maintenance alarm. Of course After simulating a fault in the busbar area, the protection should operate reliably; simulating a fault outside the busbar protection area, the protection should be reliable and not malfunctioning.

7.3.4 Bus protection action logic

According to the requirements of 6.4, respectively simulate the fault in the bus protection zone and the fault outside the zone, and check the action of the bus protection.

7.3.5 Performance Index

According to the requirements of 6.7.1, respectively simulate the fault in the bus protection zone and the fault outside the zone, and check the current and electrical Pressure setting error and delay error.

According to the requirements of 6.7.2, simulate the fault outside the busbar area and check the transmission delay of the blocking signal.

7.3.6 High temperature running test

According to the requirements of 5.1.1, according to the method specified in 7.3.3 of DL/T 478-2013.

7.3.7 Low temperature running test

According to the requirements of 5.1.1, according to the method specified in 7.3.4 of DL/T 478-2013.

7.3.8 Temperature change test

According to the requirements of 5.1.1, according to the method specified in 7.3.7 of DL/T 478-2013.

7.3.9 Temperature storage test

According to the requirements of 5.1.2, according to DL/T 478-2013 7.3.5, 7.3.6. After the test, the material of the parts should not be If the damage is irrecoverable, the power-on operation should be normal.

7.3.10 Structural and visual inspection

The structure and appearance of the device should meet the requirements of 5.7.1 and Chapter 5 of GB/T 7261-2016.

7.3.11 Accuracy and variation check

Use relay protection test equipment to check the accuracy and variation of the measuring components of the device, and it should meet the requirements of 5.3.

7.3.12 Power consumption

According to the requirements of 5.6, according to the regulations and methods in Chapter 8 of GB/T 7261-2016, carry out power consumption test on the device.

7.3.13 Switch input and output

According to the requirements of 5.4 and the regulations and methods in 6.7 of GB/T 7261-2016, the switch input and output tests are performed on the device.

7.3.14 Overload capacity

According to the requirements of 5.5, the overload capacity test shall be carried out in accordance with the provisions of 7.11 in DL/T 478-2013. After the device is subjected to the overload test, there should be no Insulation damage, its function and performance should comply with the provisions of Chapter 5 and Chapter 6.

7.3.15 DC power supply influence test

According to the requirements of 5.2.1, according to the regulations and methods in Chapter 11 of GB/T 7261-2016, carry out the power influence test on the device. In the experiment, The device should not malfunction.

7.3.16 Insulation performance test

According to the requirements of 5.8 and the provisions and methods in 7.7 of GB/T 478-2013, perform impulse voltage test and dielectric strength test on the device And measure the insulation resistance.

7.3.17 Humidity and heat resistance test

In accordance with the requirements of 5.12, the device shall be subjected to damp and heat resistance test according to the regulations and methods in 7.3.8 and 7.3.9 of DL/T 478-2013.

7.3.18 EMC performance test

According to the requirements of 5.9 and the regulations and methods in 7.4 of DL/T 478-2013, the device shall be tested for electromagnetic compatibility.

7.3.19 Mechanical performance test

Perform mechanical performance test according to 5.7.4.

a) Vibration test. According to the regulations and methods of GB/T 11287, conduct vibration response test and vibration endurance test on the device;

b) Impact test. Perform impact response test and impact durability test on the device according to the regulations and methods of GB/T 14537;

c) Crash test. Carry out a crash test on the device according to the regulations and methods of GB/T 14537.

7.3.20 Safety requirements

According to the requirements of 5.10, the safety test of the device is carried out according to the provisions and methods of 7.16 in DL/T 478-2013.

7.3.21 Record function

According to the requirements of 5.13, test the recording function of the device. The test method is stipulated by the company's product standard.

7.3.22 Time synchronization function

According to the requirements of 5.14, the device clock performance is tested in accordance with the method specified in 6.9.2 of GB/T 7261-2016.

7.3.23 Communication function

According to the requirements of 5.15, test the communication function of the device according to the method specified in Chapter 18 of GB/T 7261-2016.

7.3.24 Continuous power-on test

According to the requirements of 5.11, the device should be energized before leaving the factory. The test method is stipulated by the company's product standard.

7.3.25 IP protection level test

According to the requirements of 5.7.2, carry out the test according to the method specified in GB/T 4208.