Manufacturer of Isolators / Stockiest of Over Head Line Materials / Govt Contractors.

Balaji Engineers - Manufacturer of Electrical Equipments and Government Licensed Electrical Contractor in  Maharashtra, Karnataka, Goa, India
  • Behind Kolhapur Axle,

  • M.I.D.C., Shiroli, Kolhapur

Balaji Engineers - Manufacturer of Electrical Equipments and Government Licensed Electrical Contractor in  Maharashtra, Karnataka, Goa, India

In this electrical blog we will see about how to calculate isolator rating in electrical system.In case of fault protection reley will operate and trip the breaker till that time isolator contact blades should sustain the fault current actually it takes hardly 350 milliseconds maximum to trip the breaker. Now let us talk about breaker selection there are several points to be considered while selecting breaker. Few are listed below. Voltage rating is common point. Others are 1) Rated current 2) STC 3) Interrupting media as breaker has to interrupt heavy current there occurs arcing in between breaker contacts ( Fixed and moving contact) this arching should be effectively quenched in very few milliseconds and for that various types of quenching media are used and selection of this media depends on voltage level for which breaker is used and some what on fault level of particular bus. In pervious days oil was used as media. Now a days up to 33 KV level vacuum bottles are used means vacuum is interrupting media and EHV breakers SF6 gas is used as media. 4) Breaker tripping and closing timing.

How to Calculate Isolators

As soon as beaker trip coil receive command for tripping it should trip immediately means within 30 to 35 milliseconds. However breaker closing time is little more which can range from 90 to 110 milliseconds. 5) Breaker open close, open capacity is also important because it may happen that once tripped breaker is again recharged while fault on line is persistent. This occurs when breaker is set to autoreclose. In such cases breaker should trip reliably. 6) Even after opening of breaker contacts restriking voltage may appear in between contacts and magnitude of this voltage can be very high than normal voltage this factor is also to be taken in consideration. These are the few points to be considered while selecting breaker and Isolator for any voltage level.

132 kv 1250 Amp Isolator Disconnector

When it comes to calculating isolator disconnector ratings, it is important to have a thorough understanding of the process and the various factors involved. As a leading manufacturer in the industry, Balaji Engineers Isolators Pvt Ltd has years of expertise and knowledge in this field. In this blog, we will guide you through the steps to accurately calculate isolator disconnector ratings, ensuring the safety and efficiency of your electrical system. Whether you are a professional in the field or simply interested in learning more about isolator disconnectors, this article is for you. Read on to discover the expertise of Balaji Isolators and gain valuable insights into calculating isolator disconnector ratings.

Isolator Disconnector

Understanding the importance of calculating ratings accurately

Calculating isolator disconnector ratings accurately is a critical step in ensuring the safety and reliability of your electrical system. Inadequate ratings can result in premature failure or even worse, electrical fires and damage to equipment. On the other hand, overrating can lead to increased costs and inefficiency.

Accurate rating calculations require a comprehensive understanding of the electrical load, the operating conditions, and the specific requirements of the application. By accurately calculating ratings, you can select the right isolator disconnectors that can handle the anticipated load without compromising safety or performance.

Isolator Disconnector

110 kv 2500 Amp DBCR Isolator Disconnector Make Balaji Isolators

At Balaji Engineers Isolators Pvt Ltd, we recognize the importance of accurate rating calculations and take pride in our expertise in this area. Our team of experienced professionals is here to guide you through the process and help you make informed decisions. Stay tuned for our next section where we will delve into the key factors to consider when calculating isolator disconnector ratings.

Step-by-step guide to calculating isolator disconnector ratings

In this section, we will provide you with a step-by-step guide on how to accurately calculate isolator disconnector ratings. By following these steps, you will be able to ensure the safety and efficiency of your electrical system.

Gather information : Begin by collecting all the necessary information about your electrical load, including the voltage, current, and frequency. Also, take into consideration any specific requirements or standards that may apply to your application.

Determine the operating conditions : Next, assess the operating conditions under which the isolator disconnectors will be used. Consider factors such as temperature, altitude, and humidity, as these can have an impact on the rating calculations.

Calculate the current rating : Using the gathered information, calculate the current rating required for your isolator disconnectors. This can be done by analyzing the electrical load and factoring in any anticipated future growth.

Consider the breaking capacity : Evaluate the breaking capacity of the isolator disconnectors, making sure it is sufficient to handle any potential fault currents. This is crucial for preventing electrical fires and equipment damage.

Voltage and Current Levels : One of the most important factors to consider is the voltage and current levels of your electrical load. These values will determine the capacity required for the isolator disconnectors to safely handle the flow of electricity. It is crucial to accurately measure and analyze the voltage and current levels to avoid any overloading or underperforming situations.

Environmental Conditions : Another important factor to consider is the environmental conditions in which the isolator disconnectors will be operating. Factors such as temperature, altitude, and humidity can impact the performance and reliability of the disconnectors. It is essential to account for these conditions and select isolator disconnectors that can withstand and operate efficiently in such environments.

Fault Currents : The ability of the isolator disconnectors to handle fault currents is a critical consideration. Fault currents can occur in the event of a short circuit or electrical fault, and the disconnectors should be able to interrupt and safely isolate the faulted section. Evaluating the fault current levels and selecting disconnectors with appropriate breaking capacities is vital to prevent electrical fires and equipment damage.

Endurance and Reliability : Isolator disconnectors should be able to withstand repeated operations without any loss of performance or failure. This requires evaluating the mechanical endurance and electrical endurance of the disconnectors. Mechanical endurance refers to the number of operations the disconnectors can withstand, while electrical endurance relates to their ability to handle the electrical stress during operations. Choosing disconnectors with adequate endurance ratings ensures their long-term reliability in your electrical system.

Standards and Regulations : It is crucial to consider any specific standards IEC 62271-102 and regulations that apply to your application. These standards ensure the safety and quality of the disconnectors and should be adhered to during the calculation process. Familiarize yourself with the relevant industry standards and consult with experts to ensure compliance.

Taking into account these factors during the calculation process will result in accurately determined isolator disconnector ratings. In the next section, we will delve deeper into the importance of each factor and provide further guidance on how to evaluate them effectively. Stay tuned for more valuable insights from Balaji Engineers Isolators Pvt Ltd.

Common mistakes to avoid when calculating ratings of Isolator Disconnector

Calculating isolator disconnector ratings can be a complex process, and it is important to be aware of common mistakes that can lead to inaccurate results. By avoiding these mistakes, you can ensure that your electrical system is equipped with the appropriate isolator disconnectors.

Islator Disconnector

220 kv 2000 Amp Isolator

Neglecting Future Expansion : It is essential to consider any future expansion plans for your electrical system when calculating ratings. Failing to do so can lead to undersized disconnectors, which may not be able to handle the increased electrical load. Take into account potential expansion to avoid the need for costly upgrades in the future.

Overlooking Load Diversity : Each electrical load in your system may have different characteristics and requirements. Overlooking load diversity can result in overestimation or underestimation of ratings. Ensure that you thoroughly analyze and understand the different loads before calculating the ratings to ensure accuracy.

Ignoring Power Quality : Power quality issues such as voltage fluctuations, harmonics, and transients can affect the performance of isolator disconnectors. Ignoring power quality can lead to inadequate ratings that may result in frequent interruptions or equipment failures. Consider these power quality factors and select disconnectors that can handle such conditions.

Relying Solely on Manufacturer's Recommendations : While manufacturer's recommendations can provide valuable insights, it is crucial not to solely rely on them. Different applications and environments may require different ratings, and blindly following manufacturer's recommendations may lead to inappropriate disconnectors for your specific needs. Use the manufacturer's recommendations as a starting point, but always cross-check and validate them with your own calculations.

By avoiding these common mistakes, you can ensure that your isolator disconnector ratings are accurately calculated and aligned with the requirements of your electrical system. In the next section, we will address some frequently asked questions related to isolator disconnector ratings. Stay tuned for more valuable information from Balaji Engineers Isolators Pvt Ltd.

Remember, the expertise of a professional like Balaji Engineers Isolators pvt Ltd can save you time, money, and headaches in the long run. So, don't hesitate to reach out to an expert and benefit from their knowledge and experience. In the next section, we will address some frequently asked questions related to isolator disconnector ratings. Stay tuned for more valuable information.


In conclusion, when it comes to calculating isolator disconnector ratings, consulting with a professional is crucial. Their expertise and knowledge of industry standards can help you avoid potential pitfalls and ensure accurate calculations. By involving a professional, you can gain valuable insights, discover any issues you may have overlooked, and ensure compliance with safety regulations and legal requirements.

Mr. Suhas Bhandari, Director and Founder of Balaji Engineers Isolators Pvt Ltd, Kolhapur, Maharashtra, is the writer of this informative blog.As a well-known manufacturer of isolators, Balaji Engineers Isolators Pvt Ltd has been in the electrical solution business since 2004.The company is based in MIDC Shiroli Kolhapur and has a fully-flagged high-end machinery setup with sufficient testing facilities. High-quality isolators that have been approved and certified by ERDA, CPRI, and NABL labs are the specialty of Balaji Engineers Isolators Pvt Ltd. An isolator manufacturer, Balaji Engineers Isolators Pvt Ltd, develops a wide range of off-load isolators that are used in infrastructure projects, wind and solar projects, H T consumers, MSEDCL tenders, industrial substations, distribution substations, EV charging substations, and distribution lines.Balaji isolators are technically precise and honest in working on field .We additionally manufacture turn-and-twist isolators and banging isolators. Contractors in the electrical industry prefer our isolators for the erection of substations because of our technically sound design and user-friendly technology. In addition, Balaji Engineers manufactures isolator spare parts for any company, including Crompton Greaves and Siemens.

Our business presence for product and services are in

Andhra Pradesh – Amaravati, Arunachal Pradesh – Itanagar , Assam – Dispur ,Bihar - Patna, Chhattisgarh – Raipur, Goa – Panaji, Gujarat – Gandhinagar , Haryana – Chandigarh ,Himachal Pradesh – Shimla , Jharkhand – Ranchi , Karnataka - Bengaluru ,Kerala – Thiruvananthapuram , Madhya Pradesh – Bhopal, Maharashtra – Mumbai, Manipur - Imphal, Meghalaya – Shillong, Mizoram – Aizawl ,Nagaland – Kohima , Odisha - Bhubaneswar, Punjab – Chandigarh ,Rajasthan – Jaipur ,Sikkim - Gangtok ,Tamil Nadu- Chennai ,Telangana- Hyderabad ,Tripura- Agartala ,Uttarakhand- Dehradun ,Uttar Pradesh- Lucknow , West Bengal- Kolkata, Asansol, Bokaro, Burnpur, Durgapur, Kulti, Jamshedpur, and Raurkela , Ramgarh , Bhurkunda ,Ambala, Chandigarh , , Delhi, Faridabad, Ghaziabad, Gurgaon, Kalka ,Kurnool,Prakasam , Vishakhapatnam , Vijayawada, Vijaynagar, Rajahmundry, Guntur, Eluru , Kurnool , Thiruvananthapuram, Kollam, Alwaye, Ernakulam, Alappuzha, Kollam, Tiruvanantapuram, Alluva, Kocchi, Alappuzha, and Punalur. Ambala- Amritsar , Jaipur- Ajmer, Indore- Dewas- Ujjain, Saharampur-Muzaffarnagar- Bijnor, Prayag- Varanasi- Mirzapur, Durga- Raipur, Bilaspur- Korba, Brahmaputra valley, Kanpur - Lucknow, Bongaigaon, Dlbrygarh, Digboi, Guwahati, Noonmati Tipsukia , Darjeeling-Siliguri , Allahabad, Dalmianagar, Vadodara, Ranchi, are some of the cities that are mentioned.Regarding the products, spare parts, and services we offer for isolators under the Balaji brand, you can also get in touch with our marketing department. Contact information: 09822373222 / 09922129222 . Email : visit our website at isolators for more information.

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