Surge Protection: Safety for Sewage Plants.

Transcription

1 Surge Protection: Safety f Sewage Plants.

2 DEH Competence in ightning and Surge Protection. Surges disturb processes. Sewage plants play a key role in the use of the resource water. With a chain of mutually dependent processes, they manage to filter the toxic substances bound in the dirty wastewater and regain drinking water. Various measuring and analysis methods with extensive system technology are used f process control. Damage to this equipment can disturb the process sustainably and even lead to a threat to the environment. Therefe, its availability deserves high priity. Power supply, f example, as well as measuring and control systems of sewage plants are threatened by damage due to surges direct lightning strokes. Surges are caused by distant close lightning strokes, but also by switching operations (e.g. when switching heavy loads).

3 DEH ightning and Surge Protection f Sewage Plants from one Source. Example Example 1 rake rain overflow basin 30 V ~ pump / lift sation 4-0 ma Ex (i) 4-0 ma telecontrol signal 30 V ~ Example 5 Example 6 ventilation / grid chamber Example ma black water basin Profibus PA sewage plant control 30 V ~ primary sedimentation basin 30 V ~ Example 4 Profibus DP precipitation tank outlet sedimentation tank aeration tank nitrification / denitrification Illustration of a sewage plant. Sewage plants are especially exposed to the risks of atmospheric discharges due to their large sizes. Furtherme, interference pulses can spread well due to the widely netwked parts of the plant. A lightning protection system consists of external lightning protection, internal lightning protection and lightning equipotential bonding. External lightning protection protects buildings from fire mechanical damage by lightning. Internal lightning protection is supposed to prevent hazardous sparking within the building. ightning equipotential bonding reduces the potential differences caused by lightning currents. As a part of the lightning current flows, f example, also via the external electrical supply lines of the sewage plant and can thus damage them, the lines have to be protected by SPDs with lightning current carrying capability. Surge arresters reliably protect terminal devices from conducted surges. The lightning protection zones concept is a comprehensive catalogue of protection measures. And it helps to optimise the availability of the installation. Example: Intermeshed earth-termination system. A lightning equipotential bonding system should be established f each part building of the plant. Intermeshing these installations reduces conducted partial lightning currents among the parts of the plant. Powerful surge arresters minimise the risk due to surges. The following standards apply to the earth-termination system: IEC : Electrical and electronic systems within structures pre 50114: Materials and size requirements f earth electrodes from the crosion point of view

4 Know-how Designing aids f lightning and surge protection. The designer of the installation sets the basis f the later availability of the sewage plant. He takes effective protection measures against harmful surges. F this purpose, he applies imptant regulations which help to implement a complete protection concept. At the design stage, both the external lightning protection system, earthing system with equipotential bonding and effective protection in case of surges are taken into consideration. ightning and surge protection concept f a sewage plant Building codes IEC 6305 Protection against lightning Part : Risk management IEC 6305 Protection against lightning Part 3: Physical damage to structures and life hazard Part 4: Electrical and electronic systems within structures Application guides Codes of practice IEC Erection of power installations with nominal voltages up to 1000 V IEC / IEC ightning and surge protection f telecommunication and signalling lines

5 Concepts f Measuring Points. Example 1: Telecontrol signal and power supply ightning and surge protection f the flow and level measuring equipment at the distant rain overflow basin Shield earthing at both ends of the sht wires from the measuring transfmer to the ultrasonic senss Measured data are transmitted to the sewage plant control via telecontrol signal The power supply is provided directly by the utility The power supply and telecontrol systems are protected by combined lightning current and surge arresters capable of carrying lightning currents with an appropriate voltage protection level f terminal equipment and minimum requirements space level + volume ultrasonic measuring equipment rain overflow basin PZ 0 A 30 V ~ (T-System) telecontrol signal Example : 4-0 ma and power supply (non-ex) and 4-0 ma Ex (i) Surge protection f the sewer netwk level measuring equipment Ex zone: Shield earthing at both ends of the sht wires from the measuring transfmer to the ultrasonic senss If the measuring transfmer and Ex isolation amplifier are spatially separated, Ex (i)-type surge arresters are installed at both ends of the connecting cable Outside of the Ex zone, surge arresters are installed f protecting the 4-0 ma signal and power supply system volume 4-0 ma Ex (i) ultrasonic measuring equipment tubing power supply 4-0 ma PZ 0 B sewage plant control Example 3: x 4-0 ma and power supply Surge protection f the ph value and temperature measuring equipment Shield earthing at both ends of the lines from the measuring transfmer to the electrode of the hose fitting The ph value and temperature are transmitted to the sewage plant control as two independent 4-0 ma signals Power supply is provided by the sewage plant control The lines going to the sewage plant control are protected by surge arresters Example 4: PROFIBUS DP and power supply system Surge protection f the flow measuring equipment Magnetically inductive measuring sens with PROFIBUS DP and power supply connection The SPDs are installed close to a distribution board The shield of the bus cable has to be led continuously and earthed with low impedance both via the sens and SPD The bus cable and power supply system are protected by surge arresters ph value + temperature volume 0 inlet of the primary sedimentation basin electrode at the hose fitting sewage plant control 30 V ~ (T system) x 4-0 ma 30 V ~ (T system) Profibus DP magnetically inductive sens recirculation line PZ 0 B sewage plant control PZ = ightning Protection Zone

6 shielded sens lines telecontrol signal shielded sens lines 0 x 4-0 ma 4-0 ma Ex (i) shielded sens lines 30 V ~ (T system) 30 V ~ (T system) 4-0 ma 30 V ~ (T system) Example 1: 1 x BITZDUCTOR XT M BD 180 *Part o Y/ SPD Class TYPE 1 P 1 x BITZDUCTOR XTU M BD S *Part o Universal combined lightning current and surge arrester, -part unit, 1 x DEHventil M TT P 55 FM Part o Modular combined lightning current and surge arrester with remote signalling contact f TT systems 1 x DEHventil M T P 55 FM Part o Modular combined lightning current and surge arrester with remote signalling contact f T systems 1 x SK 16 Part o Accessies, PE terminal Example : 1 x BITZDUCTOR XT M BD S 4 *Part o x BITZDUCTOR XTU M BD S *Part o x BITZDUCTOR XT M4 BD EX 4 **Part o KEMA 06 ATEX 074 X II (1) G Ex ia IIC T4/T5/T6, FISCO 1 x DEHpipe MD EX 4 M Part o Surge arrester, Y/ SPD Class TYPE P1 KEMA 09 ATEX 01 X II (1) G Ex ia IIC T4/T5/T6, FISCO 1 x KV S M0 MS 9.5 Part o Accessies, EMC cable gland, IP 68, Ø mm x SK 16 Part o Accessies, PE terminal 1 x DEHguard M T 75 FM Part o Surge arrester Type with remote signalling contact, pluggable Example 3: 1 x BITZDUCTOR XT M4 BD 4 *Part o x BITZDUCTOR XTU M4 BD *Part o x SK 16 Part o Accessies, PE terminal 1 x DEHguard M T 75 FM Part o Surge arrester Type with remote signalling contact, pluggable Profibus DP 30 V ~ (T system) Example 4: 1 x BITZDUCTOR XT M BD HFS 5 *Part o Combined lightning current and surge arrester, -part unit, 1 Mbit/s 1 x BITZDUCTOR XTU M BD S *Part o x SAK BXT R Part o Accessies, EMC spring terminal f shield connection 1 x SK 16 Part o Accessies, PE terminal x DEHguard M T 75 FM Part o Surge arrester Type with remote signalling contact, pluggable * in combination with Part o ** in combination with Part o

7 Concepts f Measuring Points. Example 5: PROFIBUS PA Ex (i) Surge protection f the level measuring equipment The level measuring sens used in hazardous zones is connected to the sewage plant control via an intrinsically safe PROFIBUS PA unit As there is no external power supply, only the bus connect has to be protected Ex (i)-type SPDs have to be installed into metal enclosures upstream of the measuring sens Shielding within the hazardous zone has to be perfmed in accdance with IEC level ultrasonic measuring equipment black water basin Profibus PA sewage plant control Example 6: Switchgear cabinets with programmable logic control (PC) switchgear cabinet PZ 0 B Surge protection f the sewage plant control ines between parts of the plant have to be protected with the same types of SPDs as the connected measuring points At the entry of the switchgear cabinet, the cable shields have to be earthed with low impedance and lines have to be protected by SPDs The SPDs have to be arranged clearly to avoid installation errs If lightning current arresters f the supply systems are installed centrally, e.g. into the low-voltage main distribution board, the switchgear cabinets have only to be protected by surge arresters ines within the building of the sewage plant control also have to be integrated into the protection concept 30 V DP PA Ex 4-0 ma PZ = ightning Protection Zone Easy SPD testing due to ifecheck BITZDUCTOR XT with integrated ifecheck makes maintenance very easy. ifecheck uses modern RFID technology f moniting protective circuits and f communication. Independent from downtimes of the system, ifecheck allows f quick and easy testing of SPDs by means of a ptable testing device of type DRC C M3+. BITZDUCTOR XT, combined lightning current and surge arrester modules with ifecheck ifecheck Condition Moniting The ifecheck technology also allows f the permanent moniting of the surge arresters. This technology allows to continuously monit up to 300 pairs in a system of up to 15 MCM moniting devices. Faults will be signalled either by remote signalling contact to a superi system control they can be registered by a PC software which can be provided free of charge. Considering the hazard of lightnings and surges, you will be sure to have utmost protection and availability with this technology. Condition Moniting System with BITZDUCTOR XT

8 Profibus DP PA Ex 4-0 ma Profibus-PA 30 V (T system) Example 5: 1 x DEHpipe MD EX 4 M Part o Surge arrester, Y/ SPD Class TYPE P1 KEMA 09 ATEX 01 X II (1) G Ex ia IIC T4/T5/T6 1 x KV S M0 MS 9.5 Part o Accessies, EMC cable gland, IP 68, Ø mm Example 6: 1 x BITZDUCTOR XT M BD HFS 5 *Part o Combined lightning current and surge arrester, -part unit, 1 Mbit/s 1 x BITZDUCTOR XTU M BD S *Part o x SAK BXT R Part o Accessies, EMC spring terminal f shield connection 1 x BITZDUCTOR M BD HF EX 6 **Part o Surge arrester with ifecheck KEMA 06 ATEX 074 X II (1) G Ex ia IIC T4/T5/T6 TYPE P1 1 x BITZDUCTOR XT M4 BD EX 4 **Part o KEMA 06 ATEX 074 X II (1) G Ex ia IIC T4/T5/T6, FISCO TYPE P1 3 x BITZDUCTOR XT M4 BD 4 *Part o x SK 16 Part o Accessies, PE Terminal 1 x DEHguard M T 75 FM Part o Surge arrester Type with remote signalling contact, pluggable * in combination with Part o ** in combination with Part o DRC C M3+ SPD Test Device Ptable handheld device with ifecheck sens f flexible use. Visual and acoustic OK indication of identified ifecheck circuits. Quick and easy testing of the SPDs within seconds During operation Electrically isolated, no removing of the module Detection of potential thermal and electrical overload of all components Battery-operated, no external power supply necessary USB terminal f transmission of the test results on the PC Included PC software f documentation and administration of the test results Part o DRC MCM XT f Condition Moniting Stationary DI-rail-mounted SPD moniting device to ensure permanent protection and availability of the systems. Suitable f permanent condition moniting of up to 10 BXT lightning current arresters with ifecheck function. Permanent SPD moniting f maximum protection and availability of systems Detection of potential thermal and electrical overload of all components Remote signalling contacts RS 485 interface PC software f moniting available free of charge Part o

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