Technical description
Compact medium voltage switchgear ring type (RMU – Ring Main Unit), SF6 gas insulated, for indoor purposes. It is designed to supply and distribute electricity in radial and ring urban networks, industry and in all facilities, where maintaining high technical parameters in a small switchgear cubicle is desirable.
Characteristics and equipment
Characteristics
- miniature dimensions of the cubicle, maintaining high technical parameters
- high protection rate, including arc protection – confirmed with appropriate certificates,
- possibility to configure the switchgear from a range of different purpose bays: feeder, transformer, circuit breaker, metering, cable bays,
- easy switchgear expansion with other cubicles (this should be taken into account when the order is placed)
– each switchgear cubicle can be expanded by the manufacturer, - possibility to adjust the switchgear in order to cooperate with remote control and metering systems (for example, with SmartGrid networks),
- the SF6 gas tank is made from welded together stainless steel; its construction guarantees safe operation, high tightness over the lifetime of the switchgear, and is environmentally friendly,
- the manufacturer can recycle used switchgears and safely remove the SF6 gas from the tanks.
Equipment
- switch disconnector equipped with a blow-out arc extinguishing device, which in combination with the snap-action switch-disconnector operating mechanism guarantees fast and reliable closing of the device,
- vacuum circuit breaker 630A and disconnector with a grounding switch in the circuit breaker bay,
- capacitive voltage dividers,
- cable voltage indicator,
- fuse-links tripping indicator in transformer bay,
- fast grounding switch in feeder bay,
- fast grounding switch, which provides grounding to fuse-link on both ends of the transformer bay.
Safety and interlock system
The solid design of the TPM type switchgears assures reliability and resistance to adverse environmental conditions. Pressure surges, which are caused by internal arc, are eliminated by opening the safety valve installed in the lower part of the switchgear tank, and is not hazardous for the operator. Each switchgear bay is equipped with voltage indicators thanks to which an operator can be certain that the isolator bushing terminals are not live. The mechanical interlock assembly enables opening the cable compartment cover after closing the grounding switch.
There is an interlock system between the switch disconnector (circuit breaker, disconnector) and the grounding switch, and between the grounding switch and the masking covers, which prevents incorrect switching procedures. There is an additional interlock in the transformer bay of the switch disconnector between the disconnector and the fuse-link striker, and between a grounding switch and the cover masking, which isolates the tubes.
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.
Technical data: | |
Nominal grid voltage | 20kV |
Highest apparatus voltage | 25kV |
Rated frequency/number of phases | 50Hz / 3 |
Rated power frequency withstand voltage | 50kV / 60kV |
Rated lightning impulse withstand voltage 1,2/50 µs | 125kV / 145kV |
Rated continuous current | 630A |
Rated continuous current of primary busbars in feeder bays | 630A |
Rated continuous current of primary busbars in transformer bay | 250A |
Maximum fuse-link current with thermal protection in transformer bay | 125A |
Rated short-time withstand current | up to 25kA (3s) |
Rated short circuit connected current of the circuit breaker | up to 40kA (52,5kA1) |
Rated short circuit disconnected current of the circuit breaker | up to 16kA (21kA1) |
Rated peak current strength | up to 63kA |
Internal arc resistance | up to 22kA (1s) |
Degree of protection – switching compartment, SF6 tank made from stainless steel | IP67 |
Degree of protection – drive and cable connection compartment | IP4X (possible to IP54) |
Service conditions: | |
Ambient temperature | |
- short-time maximum
|
+ 40°C
|
- maximum daily average
|
+ 35°C
|
- minimum
|
|
- without secondary circuits
|
- 25°C
|
- with secondary circuits
|
- 5°C / - 15°C / - 25°C2)
|
Relative humidity | |
- maximum daily average
|
95%
|
- maximum monthly average
|
90%
|
Atmosphere in installation location | no significant salt, steam, dust, smoke, flammable or corrosive gases pollution, and no icing, frost and dew |
Installation altitude without the need to reduce SF6 gas pressure | up to 1000 meters above sea level |
Vibrations | vibrations caused by external causes or earthquakes are not taken into account |
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:
Nominal grid voltage | Rated current | Maximum transformer rated power |
6 kV | 77 A | 800 kVA |
10 kV | 57,7 A | 1000 kVA |
15 kV | 61,6 A | 1600 kVA |
20 kV | 57,7 A | 2000 kVA |
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.
Cable cross section (mm2) | Bending radius (mm) | Tray depth K (mm) |
50 | 370 | 400 |
70 | 400 | 430 |
95 | 440 | 470 |
120 | 470 | 500 |
150 | 500 | 550 |
185 | 540 | 600 |
240 | 590 | 700 |
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.
Cable type: single core with |
Cable bushing | ||
Manufacturer | Type | Cable cross section [mm2] | |
Cellpack | CTS 24kV 630A CTS 24kV 630A |
25-70 95-240 |
|
Nexans (Euromold) |
K400LB K430TB K484TB |
35-300 35-300 35-300 |
|
Tyco Electronics (Raychem) |
RSTI-5851 RSTI-5854 RSTI-5855 |
35-70 95-240 185-300 |
plastic sleeve, for example, YHAKXs, YHKX, XUHAKXs, XRUHKs, … |
Cable bushing | ||
Manufacturer | Type | Cable cross section [mm2] | |
3 M | 93-EE 825-2/70 | 70 | |
ABB | SEHDW 21.1 SEHDW 21 |
25-70 95-150 |
|
Cellpack | CWS 250A CWS 250A |
16-95 70-150 |
|
Nexans (Euromold) | K158LR W X + 11TL | 25-120 | |
Tyco Electronics (Raychem) |
RSES 5227-R | 35-70 |
Cable type: single core with plastic sleeve, for example, YHAKXs, YHKX, XUHAKXs, XRUHKs, ... |
Cable bushing | ||
Manufacturer | Type | Cable cross section [mm2] | |
3 M | 93-EE935-4/120 93-EE955-4/185 93-EE965-4/240 |
120 185 240 |
|
ABB | SET (Um ≤ 24 kV) SEHDT 23 |
35-240 300-500 |
|
Cellpack | CTS 630A CTS 630A |
25-70 95-240 |
|
Nexans (Euromold) | K400LB K400TB K430TB K440TB K484TB |
25-300 25-300 25-300 185-630 35-300 |
|
Tyco Electronics (Raychem) |
POLT-24D/1XI + RICS 5133* POLT-24D/1XI + RICS 5139* POLT-24D/1XI + RICS 5143* POLT-24D/1XI + RICS 5149* RSTI-5851 RSTI-5854 RSTI-5855 |
120-185 120-185 240-300 240-300 35-70 95-240 185-300 |
* - for operation voltage up to 24 kV in TPM switchgear feeder bays with linear setting of C type isolator bushings
- for operation voltage up to 15 kV in TPM switchgear feeder bays with triangular setting of C type isolator bushings (details in DTR TPM type switchgear)
Cable type: single core with |
Cable bushing | |||
Manufacturer | Type | Adapter | Cable cross section [mm2] | |
Nexans (Euromold) |
ITK 224 | 15TS/NSS | 25-240 | |
Tyco Electronics (Raychem) |
POLT-24D/1XI | RCAB | 70-240 |
Cable type: single core with plastic sleeve, for example, YHAKXs, YHKX, XUHAKXs, XRUHKs, ... |
Cable bushing | ||
Manufacturer | Type | Cable cross section [mm2] | |
3 M | 93-EE 820-2/70 (straight) 93-EE 825-2/70 (elbow) |
70 70 |
|
ABB | SEHDW 21.1 SEHDW 21 |
25-70 95-150 |
|
Cellpack | CWS 250A (elbow) CWS 250A (elbow) CGS 250A (straight) CGS 250A (straight) |
16-95 70-150 25-95 70-150 |
|
Nexans (Euromold) | K152SR W X + 11TL (straight) K158LR W X + 11TL (elbow) |
25-120 25-120 |
|
Tyco Electronics (Raychem) |
RSSS 5227-R (straight) RSES 5227-R (elbow) |
70 70 |
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
1) - cover for PM and TPM P system switchgears in expanded version – top connection,
2) - cover for PM and TPM P system switchgears in expanded version – lateral connection,
3) - platform under the switchgear for cubicles connection of various heights,
4), 5) - front panel depth, using lightning arresters in feeder bays (95 mm or 205mm depending on lightning arrester types),
5) - front panel depth with T2Z, L2Z, LL2Z, LZ2Z configuration,
6) - front panel depth, using lightning arresters in feeder bays (95 mm or 155mm depending on lightning arrester types, RDA 21 lightning arresters partially installed in a cable tray).
TPM switchgear - electrical diagram, front view and dimensions
WL configuration (circuit breaker and feeder bays)
In the electrical diagram, the optional accessories are in red.
WLL configuration (circuit breaker bay and two feeder bays)
In the electrical diagram, the optional accessories are in red.
WLLL configuration (circuit breaker bay and three feeder bays)
In the electrical diagram, the optional accessories are in red.
WLLW configuration (two circuit breaker bays and two feeder bays)
In the electrical diagram, the optional accessories are in red.
WLLLW configuration (two circuit breaker bays and three feeder bays)
In the electrical diagram, the optional accessories are in red.
WWWL configuration (three circuit breaker bays and feeder bay)
In the electrical diagram, the optional accessories are in red.
WWWW configuration (four circuit breaker bays)
In the electrical diagram, the optional accessories are in red.
WLL configuration (circuit breaker bays and two feeder bays)
In the electrical diagram, the optional accessories are in red.
WLL configuration (circuit breaker bays and two feeder bays) with network parameters analyser
In the electrical diagram, the optional accessories are in red.
WLLW configuration (two circuit breaker bays and two feeder bays) with network parameters analyser
In the electrical diagram, the optional accessories are in red.
WWWW configuration (four circuit breaker bays) with network parameters analyser
In the electrical diagram, the optional accessories are in red.
TL configuration (transformer bay and feeder bay)
In the electrical diagram, the optional accessories are in red.
TLL configuration (transformer bay and two feeder bays)
In the electrical diagram, the optional accessories are in red.
TLLL configuration (transformer bay and three feeder bays)
In the electrical diagram, the optional accessories are in red.
TLLLL configuration (transformer bay and four feeder bays)
In the electrical diagram, the optional accessories are in red.
TLT configuration (two transformer bays and feeder bay)
In the electrical diagram, the optional accessories are in red.
TLLT configuration (two transformer bays and two feeder bays)
In the electrical diagram, the optional accessories are in red.
TLLLT configuration (two transformer bays and three feeder bays)
In the electrical diagram, the optional accessories are in red.
LL configuration (two feeder bays)
In the electrical diagram, the optional accessories are in red.
LLL configuration (three feeder bays)
In the electrical diagram, the optional accessories are in red.
LLLL configuration (four feeder bays)
In the electrical diagram, the optional accessories are in red.
LLLLL configuration (five feeder bays)
In the electrical diagram, the optional accessories are in red.
TZ configuration
In the electrical diagram, the optional accessories are in red.
TLZ configuration
In the electrical diagram, the optional accessories are in red.
TZZ configuration
In the electrical diagram, the optional accessories are in red.
T2Z configuration
In the electrical diagram, the optional accessories are in red.
LLZ configuration
In the electrical diagram, the optional accessories are in red.
LZZ configuration
In the electrical diagram, the optional accessories are in red.
L2Z configuration
In the electrical diagram, the optional accessories are in red.
LL2Z configuration
In the electrical diagram, the optional accessories are in red.
LZ2Z configuration
In the electrical diagram, the optional accessories are in red.
T+ configuration (transformer bay + top power supply cable)
In the electrical diagram, the optional accessories are in red.
TPM P system switchgear - electrical diagram, front view and dimensions
TLL configuration (transformer bay and two feeder bays)
In the electrical diagram, the optional accessories are in red.
TLLL configuration (transformer bay and three feeder bays)
In the electrical diagram, the optional accessories are in red.
TLLLL configuration (transformer bay and four feeder bays)
In the electrical diagram, the optional accessories are in red.
TLLT configuration (two transformer bays and two feeder bays)
In the electrical diagram, the optional accessories are in red.
LLL configuration (three feeder bays)
In the electrical diagram, the optional accessories are in red.
LLLL configuration (four feeder bays)
In the electrical diagram, the optional accessories are in red.
TPM C system switchgear - electrical diagram, front view and dimensions
LTL configuration
In the electrical diagram, the optional accessories are in red.
LLTL configuration
In the electrical diagram, the optional accessories are in red.
LLLTL configuration
In the electrical diagram, the optional accessories are in red.
LZLTL configuration
In the electrical diagram, the optional accessories are in red.
LTLLTL configuration
In the electrical diagram, the optional accessories are in red.
Metering bays
Exemplary solution for TPM switchgear with M type metering (TT+(p) + M1.2 + LLL +(I) configuration)
In the electrical diagram, the optional accessories are in red.