ZUIC-7/9 Intelligent power capacitor

The main purpose and scope of application
ZUIC-7/9 series of intelligent power capacitors (hereinafter referred to as smart capacitors) are developed by the company's reactive power compensation technology for more than 20 years. It is a new generation of reactive power compensation device with independent property rights. It is mainly composed of Intelligent measurement and control unit, intelligent zero-crossing switching switch (7 series is high-power relay zero-crossing switching, 9 series is thyristor and high-power relay combined switching), intelligent protection unit, two groups (△ type) or one Group (Y-type) low-voltage self-healing power capacitors form an independent and complete intelligent compensation unit. It replaces the automatic reactive power compensation device assembled by intelligent reactive power controllers, fuses (or micro-breaks), thyristor composite switches (or contactors), thermal relays, indicator lights, and low-voltage power capacitors.
The product can be used as a single unit, or multiple units can be networked to form a compensation system. It can be used for three-phase compensation, or mixed compensation for three-phase and split-phase. Smart capacitors integrate advanced technologies such as electronic technology, sensor technology, network technology, and electrical appliance manufacturing to integrate, network, and intelligentize traditional reactive power compensation products. The structure mode of the existing low-voltage reactive power automatic compensation equipment is changed, the reliability and service life of the equipment are greatly improved, and it has the overall advantages of simple structure, simple production, cost reduction, performance improvement, and easy maintenance.

The product conforms to the standard
1. GB/T 15576-2008 "Low-voltage complete set of reactive power compensation device" Our company is the drafting unit of this standard;
2. GB/T 12747.1-2015 "The self-healing type for AC power system with nominal voltage 1kV and below Shunt Capacitor Part 1, General Principles-Performance, Test and Rating-Safety Requirements-Installation and Operation Guidelines", our company is the drafting unit of this standard;
3. GB/T 29312-2012 "Low Voltage Reactive Power Compensation Switching Device" Our company is the drafting unit of this standard;
4. GB/T 9663-2013 "Low-voltage reactive power automatic compensation controller" Our company is the drafting unit of this standard;

Functional characteristics
Modular structure The
smart capacitor is a modular structure, small in size, simple in field wiring, and easy to maintain. Only need to increase the number of modules to realize the expansion of the reactive power compensation system.

Zero-crossing switching The
zero-crossing switching function is realized by the core device intelligent zero-crossing switching relay or relay and thyristor to achieve zero-voltage switching and zero-current switching, that is, "zero-crossing switching", which reduces system power consumption. Therefore, the capacitor switching process has no inrush current impact, no removal of overvoltage, and no arc phenomenon.

Protection function
Smart capacitors have over-voltage, over-current, under-voltage, loss-of-voltage protection, short-circuit protection, capacitor over-temperature protection, harmonic over-limit protection, capacity loss over-limit alarm, switching failure alarm, circuit failure alarm, communication failure alarm And other functions, effectively guarantee the safety of capacitors and prolong the life of the equipment. Low-voltage power capacitor body temperature protection is one of its important protections, and the working power supply voltage is too high. Excessive harmonics and high ambient temperature will seriously affect the service life of low-voltage power capacitors. Setting the internal temperature protection of the low-voltage power capacitor can exit operation when the internal temperature exceeds the value, thereby prolonging the service life of the low-voltage power capacitor.
The
switching criteria of the control technology are power factor and reactive power. Reactive power flow prediction and delayed multi-point sampling technology are adopted. When the power factor is lower than the set value, the switching is controlled according to the load reactive power deficiency classification difference to ensure switching No oscillation. When the load is heavy, the reactive power is fully compensated.

Intelligent network function The
controller is optional, and the intelligent capacitor can work as a system to realize the low-voltage reactive power automatic compensation function. Individual intelligent reactive power compensation capacitors will automatically exit after failure and will not affect the rest of the work. Using intelligent network technology to build a 485 communication network, multiple capacitors are used in parallel to automatically generate a network, of which the one with the smallest address code is the host, and the rest are the slaves, forming a low-voltage reactive power automatic control system. Individual auxiliary machine failures will automatically exit. It will not affect the rest of the work, the host will automatically exit if the fault occurs, and a new host will be generated in the remaining slaves to form a new system.

High-quality power capacitors
. The capacitor components in smart capacitors adopt a progressive thickening silver-zinc coating process. The silver-zinc coating has good conductivity and stability, and the thickness is proportional to the current density there, so the heat generation is small and uniform during operation , It greatly improves the capacity stability of low-voltage power capacitors with very little attenuation. The overall high-vacuum immersion technology of the capacitor ensures that the capacitor has excellent stability and long service life. The internal main circuit of the smart capacitor uses a copper bar once Molded connection. Low current density, low contact resistance, low loss, and greatly enhanced ability to withstand overcurrent.

Man-machine communication The
use of large LCD screen full Chinese display and keys to realize man-machine communication. Real-time display of network status and capacitor operating data on the LCD: including reactive power, system power factor, voltage, current, capacitor current, harmonic distortion rate, capacitance capacity, capacitor body temperature, C/T transformation ratio, number of online units, etc.

Fault self-diagnosis technology
Real-time monitoring of the operating conditions of the internal zero switching switches, circuit breakers, capacitors and other parts of the smart capacitor, and real-time Chinese prompts on the LCD. Facilitate rapid fault location. In order to achieve maintenance-free.

The fool operation mode
can automatically identify and set the transformer ratio of the external main cabinet, and automatically identify the polarity of the sampling signal of the secondary transformer. There is no worries about the connection of the polarity and the wrong connection. Each unit can automatically generate the communication address code without manual setting. , Which is connected and ready to use.

Hybrid compensation function
can realize split-phase compensation. In the case of unbalanced three-phase load, the combination of three-phase and split-phase can be used. According to the size of the reactive power shortage of each phase, the three-phases are switched on and off separately to achieve reactive power optimization.

Model and meaning
 
such as: ZUIC-7CS-0.45-20+20 means total compensation (20+20) kvar rated voltage 450V three-phase compensation;
ZUIC-7CF-0.25-20 means A phase 6.7kvar, B phase 6.7kvar, C phase 6.7kvar total capacity is 20kvar, rated voltage 250V split-phase compensation.

Capacitor Type
Low-voltage power capacitors in smart capacitors are not impregnated with liquids, but with solid materials as a whole high-vacuum impregnation, dry structure design.
Dry-type smart capacitors are integrally flame-retardant, will not produce fire alarms, will not leak, will not pollute the environment, and will not cause environmental problems.
The three-phase smart capacitor adopts a single capacitor structure, and contains two groups of "△" type low-voltage power capacitors inside, and each group of "△" type low-voltage power capacitors can operate independently. The split-phase low-voltage smart capacitors are large in size, so they use a single capacitor structure. Each unit contains a set of "Y-" low-voltage power capacitors, and the three phases can be switched on and off separately.

Shape and installation dimensions

Commonly used product design and selection

Capacitance status display JKW-9CV, power distribution monitor JKW-9FC, JKW-9SC.
Panel hole size 113x1 13mm
Main technical parameters
Environmental conditions
1. Ambient temperature: -45-55℃;
2. Relative humidity: 40℃, 20 -90%;
3. Altitude: ≤2000m;
4. Pollution level 3;

Power conditions
1. Working voltage: 380V/220V+20%;
2. Power consumption: <0.5VA (when the capacitor is removed); <3VA (when two capacitors are put into operation);
3. Voltage waveform: sine wave; total distortion rate Not more than 5%;

Electrical safety:
Electrical clearance and creepage distance, insulation strength, safety protection, short-circuit strength, sampling and control circuit protection are in line with the requirements of the corresponding clauses in the People's Republic of China Electric Power Industry Standard DL/T842-2003 "Technical Conditions for the Use of Low-Voltage Associated Capacitor Devices";

Protection error
1. Voltage: ≤0.5%
2. Current: ≤1.0%;
3. Temperature: ±1℃;
4. Time: ±0.0ls;
    
Zero switching parameters
1. Zero switching offset: ≤2.5o ;
2, voltage shock resistance: ≥AC2500V (DC4000V);
. 3, the impact resistance current: ≥50 times the rated current;

Reliability parameters
1. Control accuracy: 100%;
2. Allowable switching times: ≥1 million times;
3. Capacitor capacity operating time attenuation rate: ≤1% year;
4. Capacitor capacity switching attenuation rate: ≤0.1% /10,000 times;
5. Annual failure rate: ≤0.1%;

Reactive power control parameters
1. Reactive power control error: ≤75% of the minimum capacitor capacity;
2. Smart capacitor dynamic response time: <1s;
3'smart capacitor switching time interval: >30s;
4. Reactive power capacity: single Taiwan≤(20+20)kvar (three-phase); ≤30kvar (separate-phase);

Measurement error
1. Voltage: ≤0.5% (within the range of 80-120% of the rated voltage of the power supply);
2. Current: ≤1% (within the range of 5%-20% of the rated current); ≤0.5% (within 20%- Within 120% of the rated current);
3. Power: ≤1%;
4. Temperature: ±1℃;
5. Power factor: ±0.01;

Display panel and terminal block

Product installation wiring diagram

Product wiring physical diagram

Communication cable
ZUIC-ACC-ZNCN-xxx type smart capacitor communication cable: through the company’s special network communication line, each smart capacitor will share the secondary current signal output by the current transformer, and complete the communication between each other Network command interaction function. Connection object: smart capacitor, external controller, external power distribution monitor. (Note: At most one external device can be used in the same network) Model description: xxx means the length of the cable, in centimeters (cm), for example: 025 means the total length of the cable is 25cm.

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The model in this table only describes the length of the cable. When ordering, it can be described as ZUIC-ACC-ZNCN-xxx type or smart capacitor communication cable xxx type. In addition, the 025 type is a random distribution cable. The user should consider whether there is upper and lower assembly or front and rear assembly in the cabinet when ordering, and explain it when ordering so that the company can provide it, otherwise 100cm will not be delivered randomly.