Training and verification - [Photovoltaic operation and maintenance certificate, photovoltaic project certificate, carbon trading certificate registration portal] Inspection and maintenance procedures for reactive power compensation cabinets 1. Scope This procedure stipulates the

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3. Equipment technical parameters

Electrical characteristics	Rated voltage (V)	AC400, AC690, AC1140
Working frequency ( HZ)	50±0.2
response time	20ms~100s adjustable
installation capacity	75kvar to 1080kvar
cast Levels	5 to 23
Overload capacity	1.1 times (8h/d)
Multiple operating modes	Parallel operation
system voltage distortion rate	THD＜5% or THD5＜5% (harmonics are mainly 5th)
Control characteristics	Control power supply	AC 220V±10%, 10A, 50HZ
Control algorithm	Capacity allocation supports equal volume circulation, multiple encodings and fuzzy Control and other methods
communication function	adopts Modbus remote communication protocol, communication interface RS485
control Connection	Photoelectric isolation
Power factor	0~0.999 adjustable (inductive)
Current sampling	Transformer bus current, 0~5A, see the figure for details Paper
Voltage sampling	Transformer bus voltage, 220VAC, see the drawing for details
Number of control channels	≤12
Switching delay	20ms~100s
Structural characteristics	Protection level	IP30
Cooling method	Forced air cooling
Overall structure	Floor-standing
Installation method	Indoor installation, fixed method optional, cable entry method optional

IV. Maintenance cycle

Daily maintenance : Inspect the reactive power compensation cabinet every day.

minor repair cycle: eliminate defects found during equipment operation.

overhaul cycle: overhaul once a year.

5. maintenance items

1. Routine maintenance

(1) Check that the TSC reactive power compensation cabinet control device is operating normally.

(2) Check whether the sound in the compensation cabinet is normal.

(3) Check the cleanliness, insulation condition and grounding connection of insulator .

(4) Check whether there is any heating or discoloration at the electrical connection part, and whether there is any burn or overheating anywhere on the busbar.

(5) Check whether the capacitor , reactor and each terminal are firm and reliable.

(6) Check whether the capacitor and reactor have heat, discoloration or deformation.

(7) Check whether there is breakdown in the capacitor and whether the insulation of the reactor is damaged. If so, handle it appropriately.

(8) Check that the circuit breaker , thyristor , arrester , wiring and other equipment are intact.

(9) Check that the ventilation device is good.

(10) cleans the inside of the cabinet.

2, minor repair project

(1) Measure the capacity of a single capacitor , and compare it with the previous record (or when it is put into operation). If there is an obvious change exceeding about 5%, replace it with a product of the same specification in a timely manner depending on the situation. (2) Check whether the capacitor leaks oil. If the capacitor leaks oil, it should be replaced. Whether it has been contaminated, if so, it should be cleaned up. (3) Check whether other electrical components are in good condition and whether the fastening bolts are loose. (4) Check the setting value and action of the relay protection. (5) Check whether the three-phase capacitance value is balanced and compare it with the previous record (or when it is put into operation). If the three phases are unbalanced and the difference is large, the capacitance value of a single capacitor should be further checked to find the faulty capacitor and replace it. (6) Handle problems found during daily maintenance. 3, overhaul project

(1) Check the molded case circuit breaker

(2) Check the controller

(3) Check the power unit

(4) Check the thyristor

(5) Check the fuse

(6) Check the capacitor

(7 ) Check the reactor

6. Maintenance process steps and quality standards

Maintenance items	Process flow and quality standards
1 Molded case automatic air switch Maintenance	1) The appearance of the equipment should be clean; 2) All wiring should be tight and not damaged and scorching phenomenon; 3) Check the action mechanism, the mechanism should be flexible and reliable; 4) All bolts should be tightened; 5) Check the main and auxiliary contacts , the contact surface should be clean, no oxide layer, close contact, open and close Reliable; 6) Check insulation resistance , the insulation resistance between phases and relative ground is not less than 1MΩ; 7) switch action test, the action is flexible, the indicated position of the switch is consistent with the actual position, the manual operation of the switch is normal, the electrical, The mechanical interlocking is normal and reliable.
2 controller check	1) The appearance of equipment should be clean 2) All terminals of should be tightened without damage or burning 3) The buttons of equipment should not be damaged and the display should not be damaged 4) The switching buttons are flexible and normal
3 Power unit Inspection of	1) The power unit circuit board is clean 2) No discoloration, damage or scorching
4 Inspection of thyristors	1) The appearance of the equipment should be clean 2) Check that all wiring should be tightened and there is no damage or scorching 3) All bolts Maintenance of low-voltage fuses
5 should be tightened	1) The appearance of the equipment should be clean; 2) Check the fuse body. There should be no breakdown or cracks. The resistance values ​​of the three phases should be basically the same, and the fuse cap should not be loose.
6 Capacitor maintenance	1) The appearance of the equipment is clean 2) All wiring should be fastened and free of damage and burns 3) Inspection bolts should be tightened 4) Check that the shell has no cracks and no oil leakage
7 Reactor maintenance	1) device appearance Clean 2) All wiring should be fastened, without damage or scorching 3) Check that the bolts should be tightened 4) Check the anti-corrosion status of each part 5) coil should have no deformation, good insulation, and no moisture aging 6) Each insulating paint should be free of moisture and moisture. Falling off and fading

serial number	fault phenomenon	fault cause	troubleshooting method
1	The voltage indicated by the three-phase voltmeter is low	The three-phase voltage is unbalanced due to missing phase	Check the fault record of the controller to see if it is missing phase
2	A, B, C The indications of the three ammeters are unbalanced	The imbalance of the voltage can cause the imbalance of the current, or the damage of the capacitor can also cause the imbalance of the current	In the case where there is no fuse alarm, first check the fault record of the controller , observe whether it is due to lack of phase, and check whether the thyristor switch indicator light of the capacitor bank is not lit. The fault light is on. The thyristor failure, fan stalling, etc. cause the thyristor temperature to be too high, causing the temperature control switch to operate.	a. Check whether the fans of each group have stopped and whether the AC contactor can conduct normally. b. Check the fault record of the controller, check the fault branch and the cause of the fault.
4	The main circuit is powered on, and the controller has no display.	1. Is the power supply introduced to the controller? 2. The controller is broken.	a. Use the multimeter to check whether There is voltage on the main line (primary line), and this item must be operated with power. Special care and compliance with specifications are required during specific operations; b. Check whether the protective fuse for taking the voltage is connected and whether it is broken. In the non-energized state Check that the connection is tight. c. Check whether the voltage terminals of the controller are connected and connected tightly. Check and connect firmly in the non-energized state. d. Confirm whether there is any problem with the controller and replace it immediately if there is any problem.
5	There is a big difference in the current value shown by the current indicator meter of the entry cabinet in the power distribution room and the controller.	The current transformation ratio is set wrong, or the CT wire is not connected properly and the current indicator meter of the entry cabinet is broken.	a. Check whether the CT transformation ratio on the main line is consistent with the one set on the controller. If it is inconsistent, it needs to be reset to the same value. b. Check whether the CT lead on the main line is firmly connected to the terminal of the controller, and confirm that the current signal is transmitted to the controller, otherwise check the line.
6	The circuit wire connected to the capacitor is seriously heated or burnt.	The terminal is not connected tightly or there is overcurrent.	a. Use the appropriate gear current clamp card. Is the working current of this capacitor when it is switched on different from the rated current ? When the voltage is normal, if the current difference is very large, the capacitor may be damaged or the on-site harmonics are serious. It needs to be confirmed after testing with the power quality analyzer . b. Whether the relevant joints of the capacitor branch are connected or pressed tightly needs to be checked in a non-energized state, and the terminals must be processed. c. Check whether the wires are designed according to standards. Generally, copper wires are selected to carry a current of 5A per square millimeter.
7	The reactor is very noisy	1. The harmonics exceed the standard 2. The cabinet strength is not enough 3. The quality of the reactor	a. Use the appropriate current clamp to clamp the working current of the capacitor. Is it very different from the rated current? When the voltage is normal, if the current disparity is large and the reactor noise is large, it may be caused by large current or serious harmonics on site. It needs to be confirmed after testing with a power quality analyzer. b. If the reactor makes a lot of noise under normal operating current, it can be determined to be a problem with the reactor itself or resonance with the capacitor cabinet.
8	The capacitor is bulging or has "oil leakage" phenomenon	Harmonics exceed the standard, causing overcurrent or poor capacitor quality	a. After discovering this phenomenon, the capacitor set should be cut off immediately and replaced with new capacitors. No more capacitors should be replaced before the cause of the damage is determined. Add a capacitor to avoid further damage. b. Use a power quality analyzer to test the on-site harmonics. If the harmonics exceed the standard, the on-site harmonics need to be processed. If the harmonics are not serious, it can be confirmed whether it is a capacitor problem or normal damage.
9	The power factor display of the controller is abnormal	1. The voltage or current wire phase sequence is reversed 2. The controller is broken	a. The A, B, and C phase CT wires (current wires) and voltage wires are not connected to the corresponding controller terminals according to the wiring diagram. , check the wiring according to the wiring diagram and carefully check the phase sequence of the main circuit. b. There is a problem with the controller itself. If it is confirmed that it is a problem with the controller, we will coordinate and replace it with the user as quickly as possible.
10	The power factor is very low, the controller still does not input	1, the load reactive power is small and does not reach the input threshold 2, the current transformation ratio is set incorrectly 3, alarm protection	a, the on-site reactive power is too small and does not reach the input threshold, which is normal. , just need to explain it to the customer. b. The current transformation ratio is wrong. Just check the actual CT transformation ratio and reset it to the correct transformation ratio. c. The sampling parameter alarm is for circuit protection, so it is not enabled.
11	There is a control signal on the inrush switch but it does not move	1. The polarity of the control signal is reversed, 2. The main circuit is not powered on, 3. phase loss protection , the fuse is blown 4. The "N" line is not connected good.	a. Check whether the polarity of the control signal is reversed. Check carefully and connect the control signal line according to the correct polarity. b. The main circuit is not closed. After checking that everything is correct, power on the main circuit. c. There is no voltage on a certain phase (phase loss). Use a multimeter to test. After confirming that it is a phase loss, turn off the power and check. d. The "N" wire is not connected or not connected securely. Check the circuit and then connect the "N" wire.

8. Safe operation and precautions

1. Device power supply sequence 1) Close the small circuit breakers Q1 and Q2, and observe whether the panel instruments are working normally.

2) Close the circuit breaker installation door and lock it, and close the incoming circuit breaker QF.

3) Turn the controller power knob S to the "Switch" position, and observe whether the controller display is correct and whether the capacitor bank is switched correctly.

4) immediately disconnects the power supply of the controller when it detects an abnormality.

2. Device power-off sequence 1) Turn the controller power knob S to the "cut" position and remove all capacitor banks.

2) Disconnect the incoming circuit breaker QF and open the circuit breaker installation door.

3) disconnect the small circuit breakers Q1 and Q2, and the power-off operation is completed.

3. After the circuit breaker has been opened and closed for many times, the main contacts may be partially ablated and closed to cause carbonization, which will increase the contact resistance . Regular maintenance and inspection should be carried out.

4. Be sure to ensure that the device is well grounded. The ground resistance is less than 0.1 ohm.

5. When disassembling the controller and instrument, the secondary circuit of current transformer should be short-circuited to prevent the current transformer from opening.

6. If the circuit breaker in the device trips due to a fault, check the accident scene and analyze the cause of the trip. The circuit breaker can be closed only after the cause of the trip has been identified and dealt with. During operation, the circuit breaker should be disengaged (press the handle downward during operation and place the handle of the circuit breaker in the normal opening position), and then the circuit breaker is allowed to be closed.

7. When maintaining and replacing capacitors, first power off the controller, then put the incoming circuit breaker handle to the normal opening position, allow the capacitor to discharge for more than 1 minute, and then use the DC setting of a multimeter to measure the voltage at both ends of the capacitor. Voltage, operation can only be performed when the voltage is lower than 50V.

8. Regular inspections should be carried out to observe whether the capacitor switching is normal. If an abnormality is found, the power should be cut off immediately and corresponding treatment should be carried out. Please pay special attention during debugging and maintenance. Since the cabinet door has no interlocking mechanism, there is still power in the device when the cabinet door is opened.

5 The role of the low-voltage TSC reactive power dynamic compensation device

1) improves the power factor of the electrical load and reduces the current flowing into the grid side, which has a significant energy-saving effect.

2) improves the quality of power supply voltage, reduces the voltage drop of the system, and stabilizes the terminal voltage.

3) improves the load rate of distribution transformer , reduces the losses of transformers and transmission lines, and plays a positive role in tapping the potential of power supply equipment.

4) Due to the existence of a series reactor, the device can effectively absorb harmonic current, prevent harmonic amplification, and achieve the purpose of harmonic control.

5) has a fast response speed and is particularly effective in compensating for frequently changing loads.