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Situation 1                                                   

Because of the ongoing improvement of the standards as well as the compensating capacity in modern power factor correction normally one reactor will be connected with two or more capacitors parallel to a detuned or a filter system. It is needed to pay attention to the problem that when the capacitors in a parallel circuit failure, it usually can’t be found or even less cut off. The system original tuning rate or filter accuracy will change, which not only causes decline of tuning or filter ability, but also influences the regular operation of the circuits as well as of other components. However, in extreme situation, it will cause resonance and system crash.


You can see the rate of the detuning and filter on picture 1, if one of the parallel installed capacitors breaks down, while the rest of it remains working in the circuit.   


Example

Given is a 400V system,power of the capacitor bank: 500KVar,capacitor step: 10x50KVar,reactance ratio: 7%

Technical data of capacitor and reactor:

Capacitor: 2×28.1KVar x2(C1 & C2) in parallel, capacitance:3×154.08uf: Xc: 6.8Ω, total capacitance of 2 parallel, installed capacitors: 3×308uf,total Xc: 3.4Ω

Reactor: 1×50KVar, 7%, 1pc, L: 0.238Ω, XL: 0.75mH

(Xc=capacitive reactance, L= inductive reactance, XL=electrical inductance values)


data of diverse detuning/filter rates when the capacitor step switch on in the detuned/filter system if one capacitor was failure

Event

C

Xc

L

XL

Detuned

uf

Ω

mH

Ω

P

First step, C1 working, C2 failure

462.24

6.89

0.7500

0.2355

3.41813

Various system data if step 2 is switched on…

1386.24

2.30

0.3750

0.1178

5.12541

Various system data if step 3 is switched on…

2310.24

1.38

0.2500

0.0785

5.69451

Various system data if step 4 is switched on…

3234.24

0.98

0.1875

0.0589

5.97906

Various system data if step 5 is switched on…

4158.24

0.77

0.1500

0.0471

6.14979

Various system data if step 6 is switched on…

5082.24

0.63

0.1250

0.0393

6.26361

Various system data if step 7 is switched on…

6006.24

0.53

0.1071

0.0336

6.34491

Various system data if step 8 is switched on…

6930.24

0.46

0.0938

0.0294

6.40588

Various system data if step 9 is switched on…

7854.24

0.41

0.0833

0.0262

6.45331

Various system data diverse if step 10 is switched on…

8778.24

0.36

0.0750

0.0236

6.49125


Situation 2        

Because of the widely use of electrical devices, which cause an over-heating environment for the capacitors while in operation, system’s over-voltage or over-current, as well as harmonic waves overload. These problems will cause the capacitor’s interior components over-heating so that finally failure. It does not only influence the working efficiency and the regular production, but also increases the running cost.


Therefore, in order to protect the capacitors, the broken one must be cut off automatically before the capacitors’ interior components over-heating and surpass its temperature limit.


Features

GMKPd Multi-Protection power capacitors have a special interior tuning (filter) protection terminal in parallel, which can send alarm or control signals to make the broken capacitors or circuits automatically stop operating, so that the sustainability of system tuning ratio or filter accuracy, as well as the protection of the safe operation is ensured, which makes it a new and safe capacitor.

Meanwhile, GMKPd Multi-Protection power capacitors have another special interior temperature protection terminal. Because of the over-heating environment while in operation, the system’s over-voltage or over-current, as well as harmonic waves overload. These problems will cause the capacitor’s interior components overheating so that finally failure. GMKPd can cut off itself automatically before the capacitor’s interior components over-heating and surpass its temperature limit and connects again when the capacitor’s interior temperature recovers. So the capacitor’s lifespan is extended. This will save operating costs in a long period and makes GMKPd be a new and long life style capacitor.

Protecting style

■Automatic alarm or cutting off function when the capacitor failures or over-temperature.

■System cut off and reset automatically when the capacitor internal temperature exceeds the limit during operation.

GMKPd Multi-protection capacitor’s interior special protecting terminal parameter

■ Protecting terminal style: Normally closed type switch contact

■ Voltage rating: 220V

■ Current rating: 5A

■ Emergency protection: Automatic switch contact

■ Over-heating protection:temperature-dependentsensory type

■ Over-heating temperature: 80°C

■ Working style: Isolated from capacitor


           


In addition, because of its excellent appearance, the GMKPd Multi-Protection power capacitor also has some other device designation as shown below:


■ New and exactly compensating capacitor

■ New and accurately filtering capacitor

■ Good quality capacitor

■ Low running cost capacitor


In a word, it is a really safe and durable capacitor.


Application


Plan A

The capacitor’s linkage, reactor’s temperature protecting device and contact’s coils connect in series in order to protect the safety of circuits. Whatever the capacitor or reactor failures, the system will interrupt the current from contact’s coils and cut off the broken circuits.


Plan B

Capacitor’s linkage system connects with contact’s coil in series to protect the original tuning rate or filter accuracy  and devices in circuits. 


Plan C

Capacitor’s linkage system connects with the controller’s public terminal in series to protect the  original tuning rate or filter accuracy and devices in circuits.

Electric draw of the plan A




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ASVG, multi-function of active harmonic filter and Static Var







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