TPM

Characteristics and equipment

Basic technical data

Compliance with standards:
Switchgear TPM type meets the requirements of the following standards:

• PN-EN 62271-1 - “High Voltage Switchgear and Controlgear – Part 1: Common specifications”,
• PN-EN 62271-200 - “High Voltage Switchgear and Controlgear – Part 200: Altering current metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV”,
• PN-EN 62271-100 - “High Voltage Switchgear and Controlgear – Part 100: Alternating current circuit breakers”,
• PN-EN 62271-102 - “High Voltage Switchgear and Controlgear – Part 102: High voltage altering current disconnectors and grounding switches”,
• PN-EN 62271-103 - “High Voltage Switchgear and Controlgear – Part 103: Disconnectors with rated voltages above 1 kV and up to and including 52 kV”,
• PN-EN 62271-105 - “High Voltage Switchgear and Controlgear – Part 105: Alternating current switch-fuse combinations”.

Certified by the Electrotechnical Institute.

Notice:
1) For 12 kV voltage.
2) Unless the control-metering and protection unit manufacturer has stated otherwise.

Transformer power that can be connected and disconnected in transformer bays using switch disconnectors depending on medium voltage:

Notice:
Rated currents of the fuse links to protect primary transformer circuits (recommended by leading manufacturers), with rated voltage 6 kV, 10 kV, 15 kV and 20 kV, should be selected in accordance with IEC 282-1, DIN 43625 thermal protection.

MV switchgear TPM type compartments

MV switchgear TPM type is composed of four compartments:
Switching compartment
The switching compartment is located in a tank made from stainless steel filled with SF6 gas; other installed components include: primary busbars, switching apparatus, and bushings. A fast grounding switch is an integral part of this device. Each tank has a safety valve which can be opened to remove the pressure increase caused by internal arc. In the TPM switchgear and TPM system, a C valve is installed at the bottom of the tank in the cable connection compartment in one of the feeder bays (in the TPM system P and in T+ bays of the TPM switchgear, the valve is located at the back of the cubicle). Isolator bushings are equipped with capacitive voltage dividers, which are connected to neon voltage indicators located on the front panel of the switchgear cubicles. The switch disconnectors as well as model driven operating mechanisms are exceptionally durable and reliable devices. Their design allows for 5000 operating cycles without any adjustment, maintenance, or component replacement.

Switch-fuse unit compartment
High voltage thermally protected fuse-links (according to DIN 43625 standard) are installed in the switchgear switch-fuse unit compartment (in special isolating tubes). The design of the switch-fuse unit compartment prevents its opening before the grounding switch has been closed. Closing of the switch disconnector in the transformer bay is possible only when the switch-fuse compartment door is closed. In the event of the fuse-link being burnt, the striker mounted on the link triggers the switching-off of the circuit breaker in the transformer bay. The switch disconnector can be re-closed after replacement of the fuse-links.

Operating mechanism
The operating mechanism compartment is composed of an integrated direct manual (motor driven) operating mechanism, switch-disconnector or vacuum circuit breaker, and disconnector with a grounding switch. The transformer bay is equipped with a stored energy release mechanism, which allows the circuit breaker to be opened after the reaction of the fuse-link striker. A burnt fuse-link is indicated on the front panel of the drive. In the switchgear cubicle operating mechanism, there is a pressure gauge (calibrated for different temperatures), which indicates the correct SF6 gas pressure inside the tank. Neon cable voltage indicators are installed In the front side of the switchgear cubicle.

Cable compartment
In the cable compartment, cable bushings connect the switchgear cubicle to power supply cables.
The cable compartment is equipped with:

• isolator bushings,
• cable clamps,
• protection transformers,
• grounding terminals for return cables.

The switchgear cubicle has metal partitions between particular bays in the cable connection compartment.
The TPM switchgear cubicle is designed for the mounting of the following cables:

• plastic sleeve, for example: YHAKXS, YHKX, XUHAKXS, XRUHKS;

In case mounting cable bushings with surge arresters are required, it is recommended to contact the manufacturer.

Cable trays under MV switchgears type TPM, TPM 24-P, TPM-CW

Figures 1-3 present the optional cable trays performance. The cable bending radius (depending on its outside diameter, according to PBUE) should be included in the tray depth for dry cables. Figure 1 shows the suggested cable tray depth. It is possible to avoid or reduce the depth of cable trays by using a high base or elevated floor.

TPM switchgear cable connections

In TPM type switchgears cable bushings of all leading manufacturers (CELLPACK, 3M,Nexans, Tyco Electronics, F&G, ABB) can be used. In P type TPM switchgears, a system is applied which allows the installation of straight cable bushings in air-insulated switchgear cubicles. It is a very economical solution for investors. A detailed list of bushings that can be used in TPM type switchgears is presented in the tables below.

Notice:
Straight cable bushings are used in the TPM, TPM P system switchgear in the transformer bay. However in the TPM C system switchgears, straight or elbow cable bushings are used, depending on the height of the room in which the switchgear cubicle is installed. In order to keep proper isolation of bolted connections in the feeder bays of the TPM P system switchgear, an RCAB or 15TS/NSS type adapter should be additionally installed, according to the cable bushing used (details in DTR switchgear TPM type). A cable tray is required under any type of switchgear. As an alternative, the switchgear can be installed on a high base or elevated floor. If another type of cable bushings are used, please contact the manufacturer.

Assembly method of expandable units

The TPM switchgear can be expanded with other units (provided that it is discussed during pricing and ordering). Exemplary assembly methods are presented in the following pictures. For details, refer to the switchgear cubicle manual.

TPM switchgears - lateral views and dimensions

TPM switchgear - electrical diagram, front view and dimensions

TPM P system switchgear - electrical diagram, front view and dimensions

TPM Kompakt switchgear - electrical diagram, front view and dimensions

TPM C system switchgear - electrical diagram, front view and dimensions

Metering bays