NCC300 power capacitor protector capacitor protector Jining Ningchang Electric

1. Overview: The series of power capacitor protectors can be combined with switching capacitor contactors (thyristors, load switches, reactive power compensation controllers, reactors, fuses) to form a power capacitor control system. It is mainly used to protect power capacitors and compensation circuits against overcurrent, short circuit, phase loss, overvoltage and other faults that may occur; as a new product for overcurrent and phase loss protection of power capacitors, the protector fills the gap in electronic protection of domestic power capacitors. The gaps in device protection can be widely used in complete sets of reactive power compensation equipment.
2. Product features:
, complete protection function<>
Because the protector is equipped with an overcurrent protection characteristic detection circuit, it can detect possible phase failures, overcurrents, and three-phase Imbalance and other faults adopt fast protection features; capacitor faults caused by different reasons can be automatically detected. Take action protection at the same time. <>
High precision:<>
The protector is equipped with a current quantification indication scale. The setting is accurate and convenient for users to set according to the rated current of the capacitor. <>
, status indication<>
It is equipped with normal operation indication and fault status memory indication after action protection. During normal operation, the operation indicator light is on. The protector operation indicator light flashes at different frequencies according to the load current. When the circuit is over-current, the protector operates and the over-current protection indicator light is on. When the current is greater than times, no matter whether it is overcurrent or phase failure, the lock indicator lights up. Protection action: When a phase failure or three-phase current unbalance fault occurs, the protector operates and the phase failure indicator lights up: it is convenient to determine the cause of the fault. .
, Scientific control: <>
Since the auxiliary contact output interface of the protector is an independent two sets of normally open form, the protector protects the output auxiliary contacts after the power is turned on and outputs when the fault is closed and tripped. The auxiliary contact is in the open state and the alarm output auxiliary contact is in the closed state. If the protector itself fails, the output auxiliary contacts, , and are all disconnected, so the control method is more rational and scientific to realize the self-checking function. <>
Rational self-recovery and self-locking characteristics: <>
The protector is equipped with a self-recovery and self-locking circuit. When the overcurrent or phase failure is .~.times, the protector will trip. And after the delay is greater than or less than the delay, the protector automatically recovers and the control circuit automatically switches to the running state; when the overcurrent or phase failure exceeds Start counting until it is greater than or less than reset) to switch to the running state.
3. Model and selection instructions
4. Technical parameters
, specifications
, basic parameters
, phase failure and three-phase unbalance protection action characteristics
/> , Overcurrent action characteristics
5. Appearance structure and installation dimensions
6. Typical control schematic diagram
7. Installation and debugging
. Through-type threading: connect the contactor The three cables to the capacitor pass through the three threading holes of the protector in the same direction and in any phase sequence.
. Overcurrent protection setting: Adjust the potentiometer rotating knob pointer on the panel to the rated current value of the protected capacitor.
. Reset method: When the fault protector trips, the corresponding fault indicator light turns on. The protector is in the memory state. At this time, you need to manually press the button to delay the reset (the delay time is calculated after the action until it is greater than or less than the reset), and then it can be put into operation. Switch to running state.
8. Precautions
The working power supply of the protector should be consistent with the nominal voltage.
The wiring of the protector terminals should be in correct and good contact.
, Regular inspections should be carried out to ensure reliable operation.
After the protector action indication, you must carefully observe the type of fault shown and carefully check the cause of the fault. Only after correctly handling the fault can it run again.
. When the capacitor is put into operation, the running indicator light flashes. If a trip occurs within a short period of time, use a clamp ammeter to measure the actual operating current of the capacitor. If the current value exceeds .times of the rated current, it means that it is normal within the protection range. Otherwise, the overcurrent action may be caused by the excessive harmonic content in the power grid. If you want to use it reluctantly, you can modify the setting current value appropriately according to the situation. (Doing so will result in reduced protection effect, accelerated aging of the capacitor, and reduced service life. It is best to take certain measures to suppress high-order harmonics)
Basic judgment on the operating current state of the capacitor: the capacitor operates when it is normally put into operation. When the indicator light flashes with a certain frequency, if the flashing frequency is very low or there is no flashing, it means that the capacitor is running with very little current or may have no current. This situation may be that the contactor in the control circuit is not put into operation or the capacitance of the capacitor itself is reduced.
, the protector is self-locking or the self-locking light is on after a fault alarm. It indicates that there is a large current fault in the capacitor circuit, prompting the user to carefully check the cause and eliminate the fault before resetting and starting to avoid repeated expansion of the fault.
9. Ordering Instructions
The complete model of the product, frame level, and setting current must be indicated. Scope (ordering code), working power supply, quantity
Example: Selection number; -B station
-B station
Note: When selecting a protector, it is recommended that the capacitor rated current value be selected within the protector current Within % of the lower limit of the range.
Example: For a capacitor with a rated capacity r and a rated current, the protector specification should be -B and should not be -B.
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Jining Ningchang Electric Co., Ltd. is located in Jining City, the famous "hometown of Confucius and Mencius and the canal capital" in the Lunan Economic Belt, Shandong Province. It is 100 kilometers away from the Beijing-Shanghai high-speed railway, 100 kilometers away from Yanzhou Railway Station, and 100 kilometers away from Jining Qufu Airport. The company is a modern high-tech enterprise integrating scientific research, production, sales and service. The company specializes in the development of low-voltage motor protectors and power supplies with independent intellectual property rights. Products such as capacitor protectors and power multi-function meters, network power meters, etc. have passed type inspection and acceptance by relevant departments and are at the advanced or leading level in the country; the products are widely used in petrochemical, coal, electric power, smelting, light industry, building materials, machinery, etc. The industry's electric motor industrial control system meets the needs of different users for protection, control, and safe production. It is the preferred product for motor circuit protection and control by design institutes in various industries.
Quality establishes the brand and the brand wins the market as the enterprise development goal. The company takes "truth-seeking, unity, enterprising, hard work and gratitude" as the enterprise operating spirit. Ningchang people have always continued to provide customers with high-quality products and high-quality services in terms of product technology, information, and academic resources; we sincerely hope to carry out extensive cooperation with friends from all walks of life at home and abroad in academic, economic and other fields to jointly develop our ambitions. Contribute a small amount to the development of national industry!