Earthing SwitchClass B

Hochspannungstechnik Peters & Thieding GmbH

PetersHochspannungstechnik GmbHThieding

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Rated voltage kV 12 24

Rated making current kA 50/63 40/50

Rated short-time current kA 20/25 16/20

Rated short-circuit duration s 3 3

Rated lightningimpulse withstand voltage 1,2/50µs kV 75 125

Rated power-frequency withstand voltage kV 28 50

Rated frequency Hz 50/60 50/60

Class B B

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The PTE earthing switch is an indoor switching device forinstallation in air-insulated medium voltage switchgearsystems. It has been type tested with 5 closing operations atrated short-circuit making current and rated voltage, andtherefore fulfils the high demands of Class B.

The PTE earthing switch is available in the followingversions:

● 12 kV up to 63 kAPole centres 150 mm and 210 mm

● 24 kV up to 50 kAPole centres 210 mm and 275 mm

● Right hand or left hand mechanism● Actuating shaft journal (dia. 30 mm) cylindrical or

with V slot for bevel gear mechanism

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TTEECCHHNNIICCAALL DDAATTAAStandards:● VDE 0670 Part 2 (IEC 60129)● VDE 0670 Part 1000 (IEC 60694)

Electrical Data:

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The PTE earthing switch has three pairs of earthing pins which are mounted on a hinged crossbeam. They are connected by a short-circuiting bar located inside thecrossbeam. A compact design with low installation depth is achieved in this way. The crossbeam with the earthing pins is freely movable on the actuating shaft.The short-circuiting bridge is connected to one of the bearing brackets at the sidesby means of a flexible copper cable and earthed with its fastening screw. No separate earthing screw is required. The force is transmitted from the actuating shaft to the crossbeam by driver levers onboth sides of the switch. The closing motion of the earthing pins is effected auto-matically by two pre-tensioned toggle springs which relax when the dead centreposition is exceeded. The closing speed is thus independent of the speed of theoperating mechanism.The switch can be fitted with a 30 mm dia. actuating journal or with a 10 mm, 90°V slot for right hand or left hand mechanisms.Operation of the switch can be effected with a rod mechanism, bevel gear mecha-nism or flexball mechanism. A bevel gear mechanism with geared motor and emer-gency manual operation is available for remote control.Two auxiliary switches (2 NOC + 2 NCC each) can be fitted to provide feedback sig-nals in the two limit positions for control and annunciation purposes.The earthing contacts for the switch are supplied loose. They must be fitted and setto the correct distance on the opposite busbars in accordance with the installationinstructions and drawing no. GPTF 700753.

Support rod Actuating shaft Guide link

Crossbeam Pair of earthing pins

– Not shown: Earthing contacts

Contact pin spring

Toggle spring

Bearingbracket

Earthing cable

Actuating journal

Short-circuiting bar

Driver lever

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Rated Rated short-circuit Rated short- Pol centres Weight Mechanism Typevoltage making current time current (3s) kg side

kV kA kA mm

12 50 20 150 11,0 right PTE-1250-R 1512 50 20 150 11,0 left PTE-1250-L 1512 50 20 210 11,8 right PTE-1250-R 2112 50 20 210 11,8 left PTE-1250-L 2112 63 25 150 11,0 right PTE-1263-R 1512 63 25 150 11,0 left PTE-1263-L 1512 63 25 210 11,8 right PTE-1263-R 2112 63 25 210 11,8 left PTE-1263-L 2124 40 16 210 12,4 right PTE-2440-R 2124 40 16 210 12,4 left PTE-2440-L 2124 40 16 275 13,3 right PTE-2440-R 2724 40 16 275 13,3 left PTE-2440-L 2724 50 20 210 12,4 right PTE-2450-R 2124 50 20 210 12,4 left PTE-2450-L 2124 50 20 275 13,3 right PTE-2450-R 2724 50 20 275 13,3 left PTE-2450-L 27

PTE – 12 kVinstalled in a ZK9 panelwith bevel gear mechanism

PTE-2450-R 21

PTE-1263-R 15

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PTE – 12 kV built-in, with earthing contacts

The following instructions are to be observed on installation of the earthing switch to ensure perfect function and avoid damage:

● For safety reasons, the earthing switch is supplied in the closed position with the toggle springs relaxed.

● The switch must not be closed without earthing contacts.● The cantilever strength of the mounting rail for the earthing contacts must be at least 5 kN.● The operating mechanism is to be rated for a breakaway torque of max. 240 Nm (opening

torque under normal conditions 130 Nm).

1. Install the earthing switch on a flat and strong panel wall or corresponding mounting rails, at any orientation, and fastenthe flexible earthing cable to the corresponding bearing bracket.

2. Open the switch far enough to create space for installation of the earthing contacts on the opposite busbar. Lock thecontact springs by inserting a screw, pin or similar into the slot in the guide link for one of the springs.

3. Install the earthing contacts in line with the centres of the earthing pins in accordance with drawing GPTF 700753, and lightly tighten the fastening screws.

4. Slowly close the switch, and the earthing contacts are centred by the earthing pins. Tighten the fastening screws to the permissible torque (for M 8-8.8 screws).

5. Slowly open the switch, and perform a visual check on the centred position of the earthing contacts between the earthing pins.

6. Grease the earthing contacts.7. Assemble the operating mechanism: Selection and installation

of operating mechanism to match the position and design of the actuating journal (30 mm dia. cylindrical or with 10 mm V slot, 90°, right or left).

8. Test the operating mechanism: When the mechanism is closedvery slowly, the switch must not remain in the dead centre position.

9. Perform routine testing to VDE 0670 Part 2, section 7.101, i.e.mechanical function test by opening and closing the switch several times.

10. Check the connection to the station earth and establish a flexible cable connection if necessary.

MaintenanceEarthing switches of type PTE belong to class B, i.e. no maintenance work on the main contacts is necessary during their service life. Regular servicing of the switch in the course of switchgear maintenance is however useful. The intervals are dependent on the ambient conditions.

Perform the following checks:● Smooth running of the operating mechanism.● Visual examination for soiling, moisture formation, corrosion, and clean with a dry, non-fraying

cloth if necessary (do not use cleaning wool).● Regrease the contacts with lubricant type Isoflex Topas NB 52, manufacturer Klüber, or equivalent.

PTE – 24 kV with earthing contacts

PTE 12 and 24 kV – right hand mechanism. Not shown: version with cylindrical actuating journal

PTE 12 and 24 kV – left hand mechanism. Not shown: version with cylindrical actuating journal

Earthing switch

PetersHochspannungstechnik GmbHThieding

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Hochspannungstechnik Peters & Thieding GmbHSüdring 40 · D-21465 Wentorf · P.O. Box 80 07 28 · 21007 Hamburg · Telephone +49 (0) 40 72 92-30

Fax +49 (0) 40 72 92-3159 · Email: info@peters-thieding.com · Internet: http://www.peters-thieding.com

● High short-circuitmaking capacity

● Main contacts wear-free(Class B)

● Compact design

● Easy to install

● Easy to operate

● Low weight