Raychem medium voltage separable connectors for switchgears and transformers

Make the Right Choice

During our webinar on medium-voltage separable connectors for transformers and switchgears, our audience asked many important questions. Below you can read our responses.

Separable connectors are critical components of substations and cable networks. When choosing the right separable connector, many factors such as application, environmental condition, size and type of bushing must be taken into consideration to enable the reliable transfer of electrical power. During our recent webinar, our experts answered a series of audience questions which can help you make the right selection. Learn more about the different type of bushings, products and accessories for medium-voltage separable connectors to ensure high performance even in harsh environments and enhance your network reliability. 

What are the outstanding features of TE's separable connectors?

TE provides one of the broadest medium-voltage cable accessory portfolios in the market. The innovation culture and usage of modern material formulations allow an easy installation and outstanding reliability of the products.  

Do TE's medium-voltage separable connectors cater for solidly earthed systems with high earth fault current magnitudes?

Yes. Qualifying medium-voltage separable connectors to the short circuit conditions of a solid grounded network is part of the CENELC.HD.629.1.S2  

How does TE's separable connectors perform in wind farms regarding fluctuation of voltage and resonance effects?

TE cable accessories are operating for several years in a converter based electric wind and solar power generation environment without any performance issues.  

Does TE offer a solution for plug in cable cabinets without switchgear?

Yes, we are actually testing a junction box for medium voltage applications.  

Does TE provide separable connectors and bushings?

TE has one of the broadest separable connector portfolios for almost all cable types in the market. The bushings are highly standardized and provided with the electrical equipment.  

Does TE offer separable connectors for bushing type F?

TE is currently assessing the market demand.  

TE has one of the broadest separable connector portfolios for almost all cable types in the market.
Please briefly explain the differences between RICS, RSSS and RSES connectors.

RICS is a shrouded elbow termination providing additional insulation to connect a heat shrink termination with electrical equipment using plug in type bushings type C. TE straight RSSS and elbow RSES 250A connectors are screened solutions to connect cables to electrical equipment using plug in type bushings type A.  

Does TE offer two different kinds of separable connectors type A 250A?

TE offers two kinds of separable connectors type A 250A: one version with EPDM material and one range taking version with single piece silicone which has been launched in designated markets.  

Does TE offer mechanical lugs for separable connectors type A?

A range taking version of the 250A type A is already available up to 95mm². We have plans to extend the range taking capabilities up to 150mm² using mechanical lugs.  

Up to what voltage can RSTI-5855 be used?

The outer cone connectors RSTI-58xx are qualified to a maximum operation voltage of 24 kV. 

Is it possible to connect surge arresters to the outer cone connectors RSTI-56xx?

The outer cone connectors RSTI-56xx have been phased out in 2002. The only possibility to connect surge arresters is to replace the RSTI-56xx connector with the latest RSTI-58xx.  

What are the different sizes for TE's Raychem Plug In Termination (RPIT) separable connectors?

Due to the features of inner-cone connectors the main market on medium voltage electrical apparatuses is on size 2 and size 3. Size 4, 5 and 6 are high voltage inner cone separable connectors which are similar to our PHVX product range for 72 kV, 145 kV and 170 kV. Since there is no standard for the bushing type, the bushing and connector need to be provided by one supplier. 

Are the sensors for inner/outer cone connectors part of TE's portfolio?

Yes, an updated brochure showing all products will be available end of February 2016.

Do you see sensor technology being introduced into other accessories of the network such as joints?

Due to easy access for maintenance and exchange of electronic components, the termination area of cable networks is seen as one of the preferred installation places for smart grid components.  

Do you consider that the sensor technology can replace the conventional current transformers and voltage transformers today?

Due to the high flexibility and accuracy of the sensors, the conventional voltage transformers might be replaced in the future.  

What is the best technology: screw cable lugs or press cable lugs?

From a technical point of view both lug technologies are suitable. The screw type cable lugs also called mechanical lugs are state of the art technology with a wide application range and allow an installation with a wrench. 

In addition to DIN standard lugs, can we opt for IEC standard lugs?

Cable lugs for switchgear separable connectors are specially designed and are always included in the kits. No other lugs can be used. 

What is the difference between silicone & EPDM from a cost point of view?

The material market price for silicone is higher than for EPDM. In order to choose the right material, the advantages of installation, the performance as well the type of application needs to be taken into account.  

In order to choose the right material, the advantages of installation, the performance as well the type of application needs to be taken into account.
Are trifurcation kits available for unscreened PILC medium voltage cables

TE offers trifurcation kits for unscreened PILC cables. However, screened separable connectors cannot be used on these cables. It is recommended to use RICS unscreened connectors. 

Can we use 24 kV terminations for a 15 kV application?

Product qualified for 24 kV are compliant for operation at lower voltages. The application range (cable construction) needs to be considered.  

Is there a tool to disconnect outer cone separable connectors after long time use?

By using the specified grease during the installation, the removal of connectors from bushing should be possible in a smooth way. One recommended method to remove the connectors from the bushing is to inject pressurized air into the interface.