5. High-voltage switchgear
5.1 The 220kV Baohuai 2636 and bypass 2620 switches of this institute use SF6 circuit breakers of type LW10B-252W. The split-phase mechanism is adopted, and the operating mechanism model is LW10B-252W
5.1.1 Table of oil pressure values for each action characteristic of the oil pressure system: (unit: Mpa, temperature 15℃)
Break blocking pressure 19.5±0.5 Break blocking release pressure 21.5±0.5
Closing blocking pressure 21.5±0.5 Close blocking release pressure 23.5±0.5
Close locking pressure 23.5±0.5
Close locking release pressure 23.5±0.5
Close locking release pressure 23.5±0.5 23.5±0.5
Reclosing locking pressure 23.5±0.5 Reclosing locking release pressure 25.0±0.5
Oil pump starting pressure 25.0±0.5 Rated pressure 26.0±0.5
Safety valve opening pressure 28.0±1.0
Note: If the ambient temperature at the time of pressure measurement is t℃, convert the pressure as per the following formula. Conversion:
Pressure change=P(15℃)+0.075×( t-15)
5.1.2 Ambient temperature of 20 ℃ gas pressure: (unit: Mpa)
Rated pressure 0.6 Maximum pressure 0.65 Alarm pressure 0.52 Blocking pressure 0.5
5.1.3 Switch nameplate specification:
Switches Model No. LW10B-252W Rated voltage (kV) 252
Rated short-circuit breaking current (kA) 50 Rated current (A) 3150
Lightning impulse withstand voltage (peak) (kV) 1050 Model No. LW10B-252W Hydraulic mechanism
Allowable number of opening faults 20 Manufacturer Henan Pingdingshan Electric Co. Ltd.
Weight of SF6 gas (Kg) 27
5.1.4 There are the following switches, counters and pushbuttons in the mechanism box
5.1.4.1 QF5: air switch for power supply of oil pump and oil motor
5.1.4.2 QF2: air switch for power supply of illumination, counting and heating
5.1.4.3 QF3 : Heating power supply air switch
5.1.4.4 QF4: Counting power supply air switch
5.1.4.5 SPT: Remote (normal operating position), local (operated in the switching mechanism) changeover switch.
5.1.4.6 BPD:Main trip button.
5.1.4.7 BPDS: Attachment trip button.
5.1.4.8 BPE: Close button
5.1.4.9 PC1: Circuit breaker operation counter
5.1.4.10 PC2: Oil pump motor power start counter
5.1.5 The LW10B-252W SF6 switch is equipped with the following signaling and blocking circuits
5.1. 5.1 "Oil pump motor start signal: When the oil pressure of the hydraulic mechanism decreases to 25.0±0.5 MPa, the oil pump motor will be pressurized and the "oil pump running" signal will be issued.
5.1.5.2 SF6 low pressure alarm signal: When the SF6 gas pressure of the operating circuit breaker decreases to 0.52 MPa (the first alarm value), the density relay operates to send out the "SF6 low pressure alarm" signal, and sends out the "SF6 gas pressure abnormality" light sign on the control panel.
5.1.5.3 SF6 low-pressure blocking circuit: When the SF6 low-pressure alarm signal is issued, if the SF6 gas pressure continues to decrease up to the blocking value of 0.50 MPa (the second alarm value), the density relay operates to block the circuit breaker switching electrical control circuit, and at the same time, issue the "SF6 gas pressure abnormality prohibits operation" light sign.
5.1.5.4 Oil pump pressurization timeout signal: When the oil pump starts to pressurize for more than 3-5 minutes, the device starts to stop the oil pump and issues the "oil pump pressurization timeout" signal, and when the internal mechanical failure of the mechanism causes overloading of the oil pump motor, the thermal relay of the motor power supply circuit operates to cut off the power supply, and the device issues the "oil pump pressurization timeout" signal at the same time.
5.1.5.5 Locking closing circuit: When the hydraulic pressure of the hydraulic mechanism decreases to 21.5±0.5MPa and below during the operation of the circuit breaker, the circuit breaker closing circuit will be cut off and the signal of "low pressure. Prohibit the closing of the circuit breaker" signal.
5.1.5 .6 Blocking tripping circuit: When the hydraulic pressure of the circuit breaker decreases to 19.5±0.5MPa and below during operation, cut off the circuit breaker tripping circuit and issue the signal of "Low pressure. Prohibit tripping" signal.
5.2 220kV Fort Salt 2677 switch adopts LTB-245E1 SF6 circuit breaker. The split-phase mechanism, the operating mechanism model BLK-222.
5.2.1 Ambient temperature of 20 ℃ gas pressure: (unit: Mpa)
Rated pressure 0.7 Maximum pressure 0.8 Alarm pressure 0.62 Closing pressure 0.6
5.2.2 switch nameplate specifications:
Switch Model LTB-245E1 Rated voltage (kV) 252
Rated short-circuit breaking current (kA) 40 Rated current (A) 4000
Frequency withstand voltage (kV) 460 Rated thermal stabilization current (kA) 40
Allowable number of opening faults 20 Spring-loaded mechanism type BLK-222
Weight of SF6 gas (Kg) 37 Manufacturer Beijing ABB High Voltage Switchgear Co.
5.2.3 The mechanism box is equipped with the following switches, push buttons and counters:
5.2.3.1 F1:Motor storage power supply air switch
5.2.3.2 F2:Heating power supply air switch
5.2.3.3 S1:Remote control (in normal operation position), local (operated in the switch mechanism box) changeover switch
5.2.3.3 S1:Remote control (normal operation position), local (operated in the switch mechanism box) switching mechanism box operation) change-over switch
5.2.3.4 S4:Local split. Close switch
5.2.3.5 BN: Motor start counter
5.2.4 LTB-245E1 SF6 switch is equipped with the following signals and blocking circuits
5.2.4.1 SF6 low pressure alarm signal: When SF6 gas pressure of the operating circuit breaker decreases to 0.62 MPa (the first alarm value), the density relay operates to issue the "SF6 low pressure alarm signal". Relay action sends out "SF6 low pressure alarm" signal, in the control screen sends out "SF6 gas pressure abnormality" light sign.
5.2.4.2 SF6 low-pressure blocking circuit: When SF6 low-pressure alarm signal is issued, if the SF6 gas pressure continues to decrease up to the blocking value of 0.6 MPa (the second alarm value), the density relay operates to block the circuit breaker switching electrical control circuit, and at the same time, issue the "SF6 gas pressure abnormality prohibits operation" light sign.
5.1.5.1 "Oil pump motor start signal: When the oil pressure of the hydraulic mechanism decreases to 25.0±0.5 MPa, the oil pump motor will start to pressurize and issue the signal of "oil pump running".
5.1.5.2 SF6 low pressure alarm signal: When the SF6 gas pressure of the operating circuit breaker decreases to 0.52 MPa (the first alarm value), the density relay operates to send out the "SF6 low pressure alarm" signal, and sends out the "SF6 gas pressure abnormality" light sign on the control panel.
5.1.5.3 SF6 low-pressure blocking circuit: When the SF6 low-pressure alarm signal is issued, if the SF6 gas pressure continues to decrease up to the blocking value of 0.50 MPa (the second alarm value), the density relay operates to block the circuit breaker switching electrical control circuit, and at the same time, issue the "SF6 gas pressure abnormality prohibits operation" light sign.
5.1.5.4 Oil pump pressure timeout signal: When the oil pump starts to pressurize for more than 3-5 minutes, the device starts to stop the oil pump and issue the "oil pump pressure timeout" signal, and when the internal mechanical failure of the mechanism causes the oil pump motor to overload, the thermal relay of the motor power supply circuit operates to cut off the power supply, and the device also issues the "oil pump pressure timeout" signal.
5.1.5.5 Locking closing circuit: When the hydraulic pressure of the hydraulic mechanism decreases to 21.5±0.5MPa and below during the operation of the circuit breaker, the circuit breaker closing circuit will be cut off and the signal of "low pressure. Prohibit the closing of the circuit breaker" signal.
5.1.5 .6 Blocking tripping circuit: When the hydraulic pressure of the circuit breaker decreases to 19.5±0.5MPa and below during operation, cut off the circuit breaker tripping circuit and issue the signal of "Low pressure. Prohibit tripping" signal.
5.2 220kV Fort Salt 2677 switch adopts LTB-245E1 SF6 circuit breaker. The split-phase mechanism, the operating mechanism model BLK-222.
5.2.1 Ambient temperature of 20 ℃ gas pressure: (unit: Mpa)
Rated pressure 0.7 Maximum pressure 0.8 Alarm pressure 0.62 Closing pressure 0.6
5.2.2 switch nameplate specifications:
Switch Model LTB-245E1 Rated voltage (kV) 252
Rated short-circuit breaking current (kA) 40 Rated current (A) 4000
Frequency withstand voltage (kV) 460 Rated thermal stabilization current (kA) 40
Allowable number of opening faults 20 Spring-loaded mechanism type BLK-222
Weight of SF6 gas (Kg) 37 Manufacturer Beijing ABB High Voltage Switchgear Co.
5.2.3 The mechanism box is equipped with the following switches, push buttons and counters:
5.2.3.1 F1:Motor storage power supply air switch
5.2.3.2 F2:Heating power supply air switch
5.2.3.3 S1:Remote control (in normal operation position), local (operated in the switch mechanism box) changeover switch
5.2.3.3 S1:Remote control (normal operation position), local (operated in the switch mechanism box) switching mechanism box operation) change-over switch
5.2.3.4 S4:Local split. Close switch
5.2.3.5 BN: Motor start counter
5.2.4 LTB-245E1 SF6 switch is equipped with the following signals and blocking circuits
5.2.4.1 SF6 low pressure alarm signal: When SF6 gas pressure of the operating circuit breaker decreases to 0.62 MPa (the first alarm value), the density relay operates to issue the "SF6 low pressure alarm signal". Relay action to issue "SF6 low pressure alarm" signal, in the control screen issued "SF6 gas pressure abnormal" light sign.
5.2.4.2 SF6 low pressure blocking circuit: When SF6 low pressure alarm signal is issued, if the SF6 gas pressure continues to decrease up to the blocking value of 0.6 MPa (the second alarm value), the density relay operates to block the circuit breaker switching electrical control circuit, and at the same time, issue the "SF6 gas pressure abnormality prohibit operation" light sign.
5.4.3.3 S1: Remote control (normal operating position), local (operated in the switching mechanism) changeover switch
5.4.3.4 S4: Local switching. Close switch
5.4.3.5 BN: Motor start counter
5.4.4 LTB-245E1 SF6 switch is equipped with the following signals and interlocking circuits
5.4.4.1 SF6 low pressure alarm signal: When SF6 gas pressure of the operating circuit breaker decreases to 0.45 MPa (the first alarm value), the density relay operates to issue the "SF6 low pressure alarm signal". Relay action to send "SF6 low pressure alarm" signal, in the control screen issued "SF6 gas low first alarm" light sign.
5.4.4.2 SF6 low-pressure blocking circuit: After the SF6 low-pressure alarm signal is issued, if the SF6 gas pressure continues to decrease up to the blocking value of 0.43 MPa (the second alarm value), the density relay operates to block the circuit breaker opening and closing electrical control circuit, and at the same time, issues the "SF6 low-pressure blocking opening and closing" light-type plate
5.5 110kV Chen Yi 713 switch, Chen Gang 714 switch, bypass and mother 720 switch using LW16-110IW type SF6 circuit breaker, using three-phase mechanism, mechanism type LW16-110IW
5.5.1 Hydraulic system of the action characteristics of the hydraulic value table: (unit: Mpa, temperature 15 ℃)
Pre-charge pressure of nitrogen 19-17.4 Pump start pressure 31.6±1.0
Close locking pressure 27.8±0.8 Pump stop pressure 32.6±1.0
Split locking pressure 25.8±0.7
If the measurement of the pressure of the ambient temperature is t ℃, according to the following formula:
Pressure change = P15 ℃ + 0.09 (t-15)
5.5.2 Ambient temperature of 20 ℃ gas pressure: (unit: Mpa)
Rated pressure 0.6 Maximum pressure 0.65 Alarm pressure 0.52 Closing pressure 0.5
5.5.3 Switch nameplate specification:
Switch model LW16-110IW Rated voltage (kV) 110
Rated short-circuit breaking current ( kA) 31.5 Rated current (kA) 31.5 Rated current (kA) 1.5 Rated current (kA) 2.5 Rated current (kA) 3.5 Rated current (kA) 1.5 Rated current (kA) 3.5 kA) 31.5 Rated current (A) 3150
Lightning impulse withstand voltage (peak) (kV) 550 Hydraulic mechanism model LW16-110IW
Allowable number of opening faults 20 Manufacturer Pingdingshan High Voltage Switchgear Factory
5.5.4 The LW16 SF6 switch is equipped with the following signaling and blocking circuits:
5.5.4.1 Nitrogen leakage alarm signal: When the precharge pressure of the main storage cylinder in the lower part of the circuit breaker body decreases, the device will block the circuit breaker tripping control circuit and send out an alarm signal, and send out a "switch nitrogen leakage" light sign signal in the control panel.
5.5.4.2 SF6 low pressure alarm signal: When the SF6 gas pressure of the operating circuit breaker decreases to 0.52Mpa (the first alarm value), the density relay operates to send out the signal of "SF6 low pressure alarm", and the control panel sends out the signal of "SF6 gas pressure low first alarm".
5.5.4.3 SF6 low-pressure blocking circuit: when the SF6 low-pressure alarm signal is issued, if the SF6 gas pressure continues to decrease to 0.5Mpa (the second alarm value), the density relay operates to block the breaker switching electrical control circuit, and at the same time, issue the "SF6 low-pressure blocking switching" light sign.
5.5.4.4 Oil pump pressure overtime and zero pressure blocking signal: When the oil pump starts to pressurize for more than 3-5 minutes, the device starts to stop the oil pump, and when the mechanical failure within the organization causes overloading of the oil pump motor, the thermal relay of the motor power supply circuit operates to cut off the power supply, or the circuit breaker loses pressure in the hydraulic operation system during the operation (the pressure is lowered to 18±1.0MPa), the oil pressure switch operates to stop the oil pump within the organization. Inside the oil pressure switch action will cut off the oil pump motor power supply at this time, the device also issued a "oil pump pressurization timeout and zero pressure blocking signal" signal.
5.5.4.5 Blocking and Closing Circuit: The circuit breaker is in operation. Closing circuit: In operation, when the hydraulic pressure is reduced to 27.8±0.8MPa and below, the circuit breaker closing circuit will be cut off, or the hydraulic pressure will be reduced to 25.8±0.7MPa and below, the circuit breaker opening and closing circuit will be cut off and the signal "hydraulic low energy blocking opening and closing" will be issued.
5.5.4.6 Latching circuit: When the hydraulic pressure of the hydraulic mechanism decreases to 25.8±0.7MPa and below during the operation of the circuit breaker, the hydraulic switch operates to cut off the control circuit of the circuit breaker and sends out the signal of "Latching".
5.5.4.7 Oil pump motor start signal: When the oil pressure of the hydraulic mechanism decreases to 31.6±1.0MPa, the oil pressure switch operates to turn on the contactor of the oil pump motor, start the oil pump motor to pressurize the oil pump motor, and issue the signal of "oil pump motor start".
5.5.5 There are the following air switches, buttons and counters in the hydraulic mechanism box:
5.5.5.1 QF1 moisture repellent and heating power switch;
5.5.5.2 QF5 pump motor power switch;
5.5.5.3 QF4 auxiliary power switch;
5.5.5.4 SB2 local power switch;
5.5.5.4 SB2 local power switch;
5.5.5.5.5 SB2 local power switch Closing and closing buttons
5.5.5.5 SPT1 Remote control. Local selector changeover switch
5.5.5.6 PC1: Circuit breaker operation counter
5.1.5.7 PC2: Oil pump motor power start counter
5.6 110kV Chenyan 712 switch adopts 3AP1FG SF6 circuit breaker, three-phase mechanism, operating mechanism adopts spring mechanism.
5.6.1Air pressure at ambient temperature of 20℃: (unit: Mpa)
Rated pressure 0.6 Maximum pressure 0.82 Alarm pressure 0.52 Latching pressure 0.5
5.6.2Switch nameplate specification:
Switch model 3AP1FG Rated voltage (kV) 145
Rated short circuit breaking Current (kA) 10 Rated current (A) 4000
Lightning impulse withstand voltage (peak) (kV) 275 Operating mechanism type 3AP1FG
Allowable number of opening faults 20 Manufacturer Siemens
5.6.3 3 Signal and blocking circuit of SF6 switch type 3AP1FG below the ground
5.6.3.1 SF6 low pressure alarm signal: When the SF6 gas pressure of the switch in operation decreases to 0.52Mpa, the density relay sends out the SF6 low pressure alarm signal, and the "SF6 gas pressure low first alarm" light sign is issued on the switch control panel.
5.6.3.2 SF6 low-pressure blocking circuit: After the SF6 low-pressure alarm signal is issued, if the SF6 gas pressure continues to decrease to 0.50Mpa, the density relay will act to block the breaker opening and closing electrical control circuit, and at the same time, "SF6 gas blocking opening and closing" will be issued on the switch control panel.
5.6.3.3 Spring not tensioned signal: When the spring of the switching mechanism fails to store energy, a spring not tensioned light sign is issued.
5.6.4 3AP1FG type SF6 switching mechanism box each switch, the role of the button:
5.6.4.1 S3 ---- field closing button
5.6.4.2 S9 ---- field breaking button
5.6.4.3 S8 ---- remote and near-ground control switching key switch, set "1" for the remote control and "11" for near-ground control mode." 0" is to cut off the control circuit.
5.6.4.4 F1---- spring mechanism motor energy storage switch (normal should be closed)
5.6.4.5 F3---- heater power switch (normal operation should be closed, the heater operation heating and dehumidification)
5.6.4.6 X106---- maintenance power outlet
5.7 35kVSF6 Circuit Breaker
5.7.1 35kVSF6 Circuit Breaker Specification and SF6 Gas Pressure at 20℃:(Unit:Mpa)
Switch No. 371 376 311
Switch Model No. LW16-35 LW18-35 LW16-40.5
Rated Voltage (kV) 35 35 35 40.5
< p>Operating Mechanism Model CT10 CT10-A CT14Rated Current(A) 1600 3150 1600
Rated Pressure(Mpa) 0.6 0.5 0.5
Alarm Pressure(Mpa) 0.52 0.45 0.55
Latching Pressure(Mpa) 0.5 0.42 0.52
Lightning impact withstand voltage (kV) 35 185 85
Rated short circuit breaking withstand voltage (kV) 85 95 31.5
Rated current (A) 1600 2500 1600
Allowable tripping 20 20 20 20
Producer Factory Rugao High Voltage Apparatus Factory Shenyang Electric Equipment Co. Rugao High Voltage Electrical Apparatus Factory
5.7.2 35kVSF6 circuit breaker SF6 gas pressure falls to the alarm, in the control panel will be issued "SF6 gas pressure abnormal" light sign. When it falls to the blocking value, it will block the opening and closing control circuit.
5.7.3 The 301 and 320 switches will be replaced by SF6 switches:
5.7.3.1 Switch specifications:
Switch model LW8-40.5 Operator model CT14
Rated current (A) 2000 Rated pressure (Mpa) (20°C) 0.45
Rated voltage ( kV) 40.5 Alarm pressure (Mpa) (20°C) 0.45
Rated voltage ( kV) 40.5 Alarm pressure ( kV) 40.5 Alarm pressure (kV) 40.5 Alarm pressure (kV) 40.5 Alarm voltage (kV) 40.5 Alarm voltage (kV) 40.5 kV) 40.5 Alarm pressure (Mpa)(20℃) 0.42
Switching capacitor current (A) 2000 Latching pressure (Mpa)(20℃) 0.4
Rated short-circuit breaking current (KA) 31.5 Manufacturer Zhejiang Switchgear Co.
5.7.3.2 SF6 gas pressure of SF6 circuit breaker of 301, 320 When the SF6 gas pressure of SF6 circuit breakers drops to the alarm value, the control panel will emit "abnormal SF6 gas pressure" light sign. When it falls to the blocking value, the switching control circuit will be blocked
5.8 35kV Chenxi 370, Chenzhong 372, Chenqing 373, Cement 374, Chenlv 375, Liaison 378, Bypass 320, Mother Union 310, 1# Main substation 35kV side 301 switch adopts SW2-35 Ⅳ type oil-reducing circuit breaker, three linkage mechanism, the type of the operating mechanism is CT2-XG Ⅱ. The operating mechanism model is CT2-XGⅡ.
5.8.1 Switch specification:
Switch model SW2-35 Ⅳ Rated voltage (kV) 35
Rated short-circuit breaking current (kA) 25 Rated current (A) 1600
Lightning impulse withstand voltage (peak) (kV) 185 Hydraulic mechanism model CT2-XG Ⅱ
Allowed to open the fault number 8 Manufacturer Rugao high voltage 8 Manufacturer Rugao High Voltage Apparatus Factory
5.8.2 When the 35kV oil less switch is in normal operation, the spring mechanism should be in the state of energy storage, ready for the switch to open the energy, when there is no energy storage, there will be a "spring is not tensioned" light plate on the control of the switch, then you should check the energy storage power supply situation, such as can not be dealt with in a timely manner, should be reported to the work area and the relevant leaders.
5.9 Operation of the switch:
5.9.1 Normal inspection items of the switch:
5.9.1.1 The switch body, the closing and closing indication of the mechanism, and the status of the red and green lamps should be consistent, and match with the actual working conditions.
5.9.1.2 The switch oil color and level shall be normal without oil leakage; the SF6 gas pressure shall be normal without leakage sound.
5.9.1.3 The fuse has no broken strands, and the contact of the connection part is good, and there is no heat discoloration.
5.9.1.4 Casing vials have no cracks and discharge traces, and no internal discharge sound.
5.9.1.5 The switching mechanism box should be closed tightly, and the holes connected with the outside should be sealed tightly, the heating and moisture removal device is normal, and there is no odor in the mechanism box.
5.9.1.6 Hydraulic mechanism oil pressure oil level is normal, no oil leakage phenomenon, the spring mechanism is normal energy storage.
5.9.1.7 The structure of the frame is not corroded, the switch and bracket grounding is good.
5.9.1.8 The outdoor switch has no bird's nest, no debris on the body and all around, the indoor switch should be well ventilated, and the mesh door should be well locked.
5.9.2 Special inspection items for switches
5.9.2.1 Check that the switch joints are not hot and that the leads are loose and normal during overloading and nighttime lights-out inspections.
5.9.2.2 In windy, thunderstorm, foggy and snowy weather, the exterior of the switch shall be checked for no debris hitching, no flashover and discharge traces, no broken strands of heat in the lead joints, and the doors of the mechanism box and terminal box shall be closed intact, with no abnormality inside.
5.9.2.3 After opening and closing operation, the switch body and mechanism opening and closing indications shall be consistent with the red and green light indications, with no abnormal sound inside and no abnormality outside.
5.9.2.3 After tripping of the switch fault, the leads and connectors shall be checked for short-circuit and burn marks, casing for cracks and flashover phenomena, and the switch oil color, oil level, oil pressure, air pressure and other conditions.
5.9.3 Acceptance inspection items for overhaul or new operation of the switch
5.9.3.1 The lead wire joints shall be secure and not loosened, and the temperature wax tablets shall be intact, and the position of the switch shall be indicated normally in all phases;
5.9.3.2 The ceramic sleeve shall be intact and clean, and the casing shall be firmly grounded;
5.9.3.3 The oil level, pressure, and color shall be normal;
5.9.4 Hydraulic pressure shall be checked after the switch is overhauled or newly put into operation. 5.9.3.4 The electrical blocking of the hydraulic mechanism should be correctly operated, and the spring energy storage should be normal;
5.9.3.5 The electric switch should be normal;
5.9.3.6 The repair and test data should be complete, and there should be a conclusion that the unit can be put into operation;
5.9.3.7 The grounding wires of each side should be folded, the grounding knife gate should be pulled open, and there should be no leftover objects in the equipment unit;
5.9.3.8 The equipment unit should be clean and complete. 5.9.3.8 Protection and automatic devices and pressure plates shall be in the position specified by dispatching.
5.9.4 The normal switch operating voltage shall not exceed the rated value ±5‰ and the current shall not exceed the rated value.
5.9.5 Abnormal operation of the switch and handling of accidents
5.9.5.1 Handling of switch refusing to close:
A. The switch can not be closed manually, and if there is no protection action and no indication on the meter when it is closed, it can be reclosed once, and if there is a relay protection action, the reason should be found out, and it should be reported to the dispatching and the work area, which shall not be closed before the permission of the dispatching.
B.22kV split-phase operation switch feeding operation, if only one phase is closed due to the failure of the mechanism, the closed phase should be pulled open immediately, and find out the reason, report to the dispatch, if only two phases are closed, the switch should be closed again with the KK, if it is still not closed, then the two-phase switch that has been closed should be pulled open.
C. When the switch feeder operation or reclosing action occurs refusal, the switch should be immediately disconnected instantaneously from the operating power supply, report to the dispatch and work area, the switch is changed to cold standby after checking, if the cause can not be identified for a while, but the urgent need to feed, such as tripping circuit is normal, the pressure is normal, then can be used to manually close the switch, when there is a bypass switch, requesting dispatch to enable the bypass switch to be supplied on behalf of the supply.
5.9.5.2 Handling of switching refusal:
A. When the control switch is operated to the tap position but not tapped, the operating power of the switch should be disconnected immediately and instantaneously, and the switch and the mechanism should be inspected, and if it is normal, the tap operation can be carried out again, and if it is still not tapped, the operating power of the switch should be disconnected immediately, and the switch can be tapped on the spot if the pressure is normal, and the bypass switch should be used if the pressure does not allow the tap to be tapped.
After changing the bypass switch to a non-automatic one, pull the knife gates on both sides of the switch at equal potential and turn the switch into a cold standby.
B. 220kV split-phase operation switch such as three-phase refusal to split should be immediately disconnected from the operating power supply, the pressure is normal to manually split, and three-phase as far as possible at the same time. Such as two-phase refusal to split, should immediately operate KK so that the tripped one-phase operation, and then immediately disconnect the operating power supply, according to three-phase refusal to split processing. If a phase refuses to split immediately disconnect the operating power supply, and then go to the scene to operate the split button to manually split the gate.
C. Protection protection action and the switch refuses to move, so that the previous level of protection action caused by overstep tripping, should be immediately refused to split the switch operating power to pull open, report scheduling, find out the reasons, and in accordance with the relevant provisions of the overstep tripping processing; refused to jump switch must be changed to cold standby to find out the reasons for the fault has not been eliminated, prohibited to put into operation.
5.9.5.3 Handling of contact line switch tripping:
A. Restore the sound signal, record the time, check the operation of relay protection and automatic device and make a record, restore the signal and report to the dispatching.
B. Check the tripping switch oil color, oil level is normal, there is no oil spray phenomenon.
C. Whether the indication of the mechanism corresponds to the actual situation, whether the spring of the mechanism stores energy, and whether the hydraulic circuit is normal.
D. Whether each part of the porcelain is good, and whether there are any abnormalities in other equipment.
5.9.5.4 110kV, 35kV line fault tripping is due to the protection action switch refuses to act or protection refuses to act, treatment should be treated separately.
5.9.5.5 After the feeder line trip, line failure, switch trip regardless of the reclosing success or not, should identify the protection and automatic device action, make a record, report to the scheduling. After the line is tripped, if the reclosing action is not successful, wait for the dispatching order to deal with. Otherwise, it can not wait for the dispatching order, and immediately carry out strong power supply. However, attention should be paid to the following cases:
A switch tripping has reached the required number of values shall not be forced to send.
B After the switch has tripped, there is an obvious abnormality (e.g. oil spray).
C The dispatching notice has been received, the electric work shall not be forced.
D Out-of-service reclosing (excluding the case of temporary withdrawal according to the requirements of the carrier) or reclosing without operation should be immediately forced.
5.9.5.6 If serious defects are found during operation such as oil level not visible due to oil leakage from the oil switch, SF6 gas pressure so low that it is impossible to open the gate, the switch shall be changed to non-automatic and report to the dispatching to apply for the activation of the bypass switch, which shall be changed to non-automatic, and the cutter gates on both sides of the defective switch shall be used to unloop the switch, and report to the relevant leaders to wait for the treatment.
5.9.5.7 The following principles shall be applied in the case of incorrectly pulling or closing the switch
A If the switch is incorrectly pulled and there is no parallel relationship, it shall be closed immediately by itself and then reported, and if there is a parallel relationship, it shall be reported first and processed according to the instructions of the dispatching.
B Mistakenly closing the switch in the standby, report to the dispatching order.
C If it causes the main transformer switch to trip and stop the power supply, immediately close the switch, activate the main transformer, and report to the dispatch after restoring the power supply.
D If the 220kV busbar is de-energized, report to dispatch immediately and follow the dispatch order. In case of communication failure, close the switch of the receiving line (Bohuai 2636 switch) and restore the power supply to the main transformer, while the other line switches should be handled after trying to get in touch with dispatch.
E Misoperation of the relevant switch caused by misoperation or mistakenly touching the protection wiring is handled according to the above.
5.9.5.8 The hydraulic pump should not be activated more than twice a day, otherwise it should be reported to the dispatch and the work area for processing.
5.9.6 SF6 circuit breaker normal operation precautions.
5.9.6.1 Hydraulic mechanism oil pump replenishment pressure should not exceed 2 times in 24 hours.
5.9.6.2 SF6 gas in the newly installed or put into operation circuit breaker is strictly prohibited to be discharged to the atmosphere, and must be recovered using SF6 gas recovery device.
5.9.6.3 When the oil pressure drops to the point of issuing a "zero pressure locking oil pump motor" signal, the oil pump can not be pressurized, and the operating personnel shall not use the hand pump to pressurize the oil pump, otherwise it may cause the operating circuit breaker to slow break and lead to circuit breaker explosion.
5.9.6.4 When the circuit breaker is turned to maintenance, the operating energy of the circuit breaker should be cut off, and the operator should remove the power fuse of the oil pump motor in the terminal box or pull open the power gate of the oil pump motor, and the pressure stored in the mechanism should be released by the maintenance personnel.
5.9.7 SF6 circuit breaker abnormal operation and accident handling.
5.9.7.1 When the operating circuit breaker sends out the signal of "SF6 low pressure alarm" or "oil pump pressure overtime", the duty officer should go to the scene to check whether there is any obvious abnormal condition and report to the dispatching and work area at the same time, and send staff to deal with it.
5.9.7.2 When the pressure of the hydraulic system of the operating circuit breaker decreases to the first alarm value, the oil pressure switch action has blocked the closing control circuit of the circuit breaker, and when the pressure continues to decrease to the second alarm value, the oil pressure switch action also blocks the breaking control circuit of the circuit breaker. When either of these two signals issued, the operation duty personnel should check the oil pump motor AC power supply part (three-phase AC power supply fuse is if fused and no short-circuit fault circuit in the separation of the terminal box power ring switch to replace the original specification of the fuse, and then try to send a time, if the fuse is broken again is not allowed to send, report to the district to send a member of staff to deal with; if the air switch tripped should also be to check the circuit with no faults and try to send a time; if the AC contactor thermal relay action, the circuit breaker will also be blocked. If the AC contactor thermal relay action to make the motor stop, should find out whether there is a fault in the electrical circuit, whether the motor is overloaded, whether the motor temperature is normal, such as normal, the thermal relay will be restored to restore the operation of the AC contactor and to observe the motor operation and oil pressure restoration, if there is a significant leakage of oil or motor abnormality, should be reported to the scheduler and the district immediately dispatched to deal with the staff.)
5.9.7.3 When "SF6 low voltage blocking" and "nitrogen leakage alarm" signals are issued from the circuit breaker in operation, the circuit breaker's switching electrical control circuit has been blocked, and the circuit breaker should be reported to the dispatching and the work area immediately and changed to non-automatic, and then apply to the dispatching to enable the bypass circuit breaker to be operated on behalf of the circuit breaker, and then change the bypass switch to non-automatic and then unlock it with the disconnecting switch, and then decommission the circuit breaker. The circuit breaker will be taken out of service.
5.9.7.4 If the hydraulic system oil pressure drops to zero pressure blocking pressure or below, the oil pressure switch operates to block the power supply of the pump motor to prevent the hydraulic pump from re-pressurizing, resulting in slow breaking (at this time, operation of the manual pump is also strictly prohibited), the operation duty personnel should immediately report to the dispatching and the work area and change the circuit breaker into a non-automatic one, and then apply for the operation of a bypass circuit breaker to dispatching, and change the bypass switch to non-automatic. The operation duty personnel should immediately report to the dispatching and work area, and change the circuit breaker to non-automatic; apply to the dispatching to enable the bypass breaker to run on behalf of the bypass breaker, and change the bypass switch to non-automatic, then use the isolation switch to release the ring, and take the circuit breaker out of service.
5.9.7.5 When the hydraulic mechanism of the circuit breaker suddenly loses pressure during operation, the pressure contact action of the hydraulic switch locks the power supply of the oil pump motor and prevents the loss of pressure electrically, then the following emergency measures should be taken: fasten the upper flange of the coupling block with the closing block tool and then remove the fault quickly, and then, when the fault is removed, pump the pressure to the rated value, press the closing solenoid by hand to make the valves are in the closing position. After the valve are in the closed position, you can remove the closing latch tool, or take to tighten the pressure relief screw on the three-stage valve and then pressurized to the rated value, hand-pressing the closing solenoid, so that the various valves are in the closed position, and then loosen the pressure relief screw, you can return to normal.
5.9.10 SF6 circuit breaker refuses to close the possibility.
5.9.10.1 Failure of the operating power supply and secondary circuit (e.g., low power supply voltage, blown fuse, broken circuit, poor contact of auxiliary switch, etc.).
5.9.10.2 Failure of the closing iron core coil, the operating handle returns too fast.
5.9.10.3 Hydraulic mechanism oil pressure reduced closing circuit is blocked.
5.9.10.4 The SF6 gas pressure is reduced and the closing circuit is blocked.
5.9.10.5 Closing core jamming.
5.9.10.6 Hydraulic system failure.
5.9.11 Possibility of SF6 circuit breaker refusing to open.
5.9.11.1 Failure of the operating power tripping circuit, etc.
5.9.11.1 Failure of the operating power tripping circuit, etc.
5.9.11.2 SF6 gas lowering blocking tripping circuit.
5.9.11.3 Lowering of hydraulic pressure to block the tripping circuit.
5.9.11.4 Mechanical failure of the mechanism.
5.9.11.5 Failure of the oil system of the mechanism.
5.10 SF6 circuit breaker accidental explosion or serious gas leakage and other accidents, the operating personnel on-site inspection of the equipment should be cautious, as far as possible, choose to approach the equipment from the "upwind", there must be possible measures to prevent SF6 gas poisoning.
5.11 Mechanism energy storage
5.11.1 The hydraulic mechanism does not require the operator to release the mechanism. When the switch is being serviced, the operator only needs to disconnect the power supply of the energy storage, and the energy storage of the mechanism is released by the inspector. When restoring, just turn on the energy storage power supply
5.11.2 Steps for releasing the stored energy of the spring mechanism:
5.11.2.1 Check that the switch is in cold standby state
5.11.2.2 Disconnect the energy storage power supply
5.11.2.3 Close the switch once and then divide it once near the switch (the mechanism should be closed first in the case of 110kV and 220kV). (110kV, 220kV should be the organization of the remote control, local changeover switch to the "local" position)
5.11.2.3 spring mechanism to restore the energy storage only need to be stored in the power supply.