ABB综合保护器

Medium Voltage Products PR512 Microprocessor-based self-supplied protection relays 1 1 2 3 4 5 6 7 8 DESCRIPTION CHARACTERISTICS AND ORDERING CODES PR512/P (50-51) UNIT PR512/P (50-51-50N-51N) UNIT PR512/PD (50-51-50N-51N + DIALOGUE) UNIT TIME-CURRENT CURVES OVERALL DIMENSIONS ELECTRICAL CIRCUIT DIAGRAM 3 7 11 15 21 25 31 33 2 3 1 Special features 4 Protection always active 5 Use 5 Electromagnetic compatibility 6 Service conditions 6 Degrees of protection 6 Technical documentation 6 Quality System and Environmental Management System 6 DESCRIPTION 4 DESCRIPTION The PR512 relays are devices using digital microprocessor-based technology to obtain data processing regarding the protection. The PR512 are used as switchboard protection units and provide protection of the installations, combined with ABB medium voltage HD4 series circuit-breakers. Special features Trip precision Wide setting range Operation ensured even with the primary circuit with single-phase power supply No limitation of the rated breaking capacity and short-time withstand current of the circuit- breaker even for the lowest rated currents of the relay Single and simultaneous adjustment of the three phases Constancy of characteristics and operating reliability Processing of the RMS value to express the true energy content of the current. PR512/P (50-51) provides the protection functions against overload (51), instantane- ous or delayed short-circuit (50) displays the phase current with the highest load. PR512/P (50-51-50N-51N) provides the protection functions against overload (51), instantane- ous or delayed short-circuit (50), earth fault (51) and instantaneous of delayed earth fault (50N) displays the phase current with the highest load. PR512/PD (50-51-50N-51N + dialogue) provides the protection functions against overload (51), instantane- ous or delayed short-circuit (50), earth fault (51) and instantaneous of delayed earth fault (50N) displays the phase current with the highest load has the dialogue function and allows connection to the electrical installation management system. 5 1 Protection always active The PR512 are the self-supplied type of relay and ensure complete installation protection even without an auxiliary power supply. The energy for correct operation and for circuit- breaker tripping is supplied by the same current transformers which also make the current signal to be processed available. Operation is ensured even with the primary circuit with single-phase power supply. Thanks to these characteristics, the PR512 are also suitable for use in unmanned distribution substations without auxiliary services. Use The PR512 relays can be installed in medium voltage primary or secondary distribution switch- boards for protection of MV/LV lines and trans- formers. 6 1 DESCRIPTION Electromagnetic compatibility The PR512 microprocessor-based protection relays ensure correct operation and are immune to unwarranted trips, even in the presence of interference caused by electronic apparatus, by stormy weather conditions or electric discharges. Moreover they do not interfere with any electronic apparatus near the installation. These performances are obtained thanks to the following construction characteristics: – the galvanised iron box provides efficient electromagnetic screening – special filters on the current transformer inputs guarantee immunity against conducted interfer- ence – the precise construction technique of the printed circuit helps to keep the level of electromagnetic sensitivity very low. The above is in compliance with the EN 50081, 50082 and IEC 255-22 Standards as well as with European Directive EEC 89/336 regarding electromagnetic compatibility )EMC), in respect of which the releases are marked with the CE mark. Service conditions – Operating temperature: - 5 °C ... + 40 °C – Storage temperature: - 40 °C ... + 90 °C – elative humidity without condensation: 90% – MTBF: 15 years at an operating temperature of +45°C. Degrees of protection The degree of protection of the units mounted in a switchboard is IP30. For higher degrees of protection, please consult ABB. Technical documentation For in-depth technical and application aspects, please ask for the following publications: – UniMix switchboards 1VCP000008 – UniAir switchboards 1VCP000065 – SafePlus switchboards 1VCP000086 – SD-View systems 1VCP000176. Quality System and Environmental Man- agement system: these comply with the ISO 9001 and ISO 14001 Standards respectively and are certified by an independent body. UniAir: air-insulated metal-enclosed switchboards for secondary distribution Rated voltage ... 24 kV Rated current ... 1250 A Short-time withstand current ... 20 kA SafePlus: gas-insulated metal-enclosed switchboards for ring main units Rated voltage ... 24 kV Rated current ... 630 A Short-time withstand current ... 20 kA 7 2 Current transformers 8 Overload values 8 Earth fault external toroid 8 Power supply 8 Opening solenoid 8 Protection and trip signals 8 Binary input for control function 9 TEST function 9 Signalling outputs 10 Technical data of the relay contacts 10 Measuring function 10 Ordering codes 10 CHARACTERISTICS AND ORDERING CODES 8 CHARACTERISTICS AND ORDERING CODES Current transformers The current transformers (CT) (two or three according to the protection functions selected) must have the following characteristics: – rated secondary current 1 A – performance 2.5 VA – precision 5 P 10 – safety factor 15 – thermal performance (Ith) 25 kA (1s - 50 Hz) – service frequency 50-60 Hz – for correct ammeter reading, the CT must be combined with the following rated primary currents: 40 A, 80 A, 100 A, 150 A, 200 A, 250 A, 600 A, 1250 A. The rated current of the CT must be adjusted by means of the Dip Switches on the front of the relay. For CTs with other rated currents, the ammeter reading can be taken as a percentage of the rated value. In this case, preparation for a 100 A CT is set Overload values The overload values allowed are as follows: – 1.5 x In (continuous) – 6 x In for 30 s – 25 kA for 1 s. Earth fault external toroid The PR512 relay can be used with an external toroid to detect the earth fault current, as long as it has the following characteristics: – rated primary current at customer’s choice – rated secondary current 1 A – performance at 1 x In 1 VA – precision class 3 or higher – ultimate precision factor at the customer’s choice according to the total preci- sion class required – service frequency 50-60 Hz Power supply The self-supply circuit, through the current trans- formers, activates the protection and measuring functions, even in the absence of an auxiliary power supply, starting from a minimum value of primary current of 0.2 x In on at least one phase fitted with CT. The external toroid (for the protection functions 50N - 51N) does not contribute to the self-supply. The unit can be fitted with an auxiliary power supply with 24 Vd.c. rated voltage, should the protection, measuring and control functions be required with the primary current less than 0.2 x In. This power supply is always indispensable for the control and dialogue functions in the PR512/PD version. The auxiliary voltage must be supplied from a feeder with galvanic insulation. Characteristics of the auxiliary power supply – Input voltage 24 Vcc –20% ... 30 Vcc +10% – Max. ripple ± 5% – Max. absorbed current PR52/P: 50 mA PR512/PD: 150 mA The apparatus remains galvanically insulated by this power supply by means of an internal DC/DC converter. The auxiliary power supply must be made b means of a static continuity group independent of or derived from a busbar system on the supply side of the circuit-breaker. Opening solenoid Circuit-breaker tripping takes place by means of an opening solenoid with demagnetisation which acts directly on the circuit-breaker operating mechanism. The solenoid receives the energy required for operation directly from the PR512 unit, and does not therefore require any auxiliary power supply. Protection and trip signals The releases have optic indicators on the front and bistable contacts. The detailed description of these is given in the paragraphs below. 9 2 Binary input for control function This input allows remote opening of the circuit- breaker. The input must be made with a screened two-pole cable. Screening must be earthed on the metal box of the PR512 (please refer to the connection diagram enclosed with the circuit-breaker). By connecting an unsupplied external contact (e.g. the contact of a Buchholz relay) to the special input connector, it is possible to control circuit- breaker opening remotely through the PR521 when the primary current exceeds the value of 0.2 x In on at least one phase fitted with a current sensor. Should tripping for phase currents under 0.2 x In have to be guaranteed, the auxiliary power supply is required. The maximum length of the connection is 30m. The connection must be made with a screened two-pole cable. – Put Dip Switch 1 in position A to enable TT2 for operation. This also enables the test unit power supply with the display therefore lighting up. In this case, it is also possible to carry out hardware resetting of the protection and resetting of the K51/ YO3 signalling relays. – Put Dip Switches 1 and 2 in position A and press the TEST pushbutton to release the YO3 opening solenoid with consequent circuit-breaker opening. – Put Dip Switches 1 and 3 in position A and press the TEST pushbutton to check functions I> and I>> Front view of the TT2 Test Unit Rear view of the TT2 Test Unit TEST function By using the TT2 accessory (Test Unit supplied on request), the overall functionality TEST of the relay release (electronic part and YO3 opening solenoid) can be carried out. By means of the 9 PIN connector, the TT2 Test unit allows the TEST to be carried out on func- tions 50-51 in the configuration with definite time curve (DT). The above-mentioned TEST can be carried out with the YO3 opening solenoid activated (TRIP) or de-activated (TEST). Use of the TT2 unit (only for the fixed time curves) and start selected function timing with subsequent release of the YO3 opening solenoid and consequent circuit-breaker opening. – Put Dip Switches 1, 3 and 4 in position A if the YO3 opening solenoid opening command is to be disabled during checking of function I> and I>>. – To carry out self-diagnosis of the battery charge and correct operation of the TT2, put Dip Switch 1 in position A, press the CHECK pushbutton and verify that the LED lights up. If the LED is off, the battery must be replaced. 10 2 PR 512/P PR 512/PD Signalling outputs • Signalling output by means of closing contact. A closing contact is available to signal relay trip (K51/YO3). The contact is of the bistable type and belongs to a relay which keeps its sate even with a power cut and until the RESET operation. After protection trip and circuit-breaker opening, the contact can be reset by means of the RESET pushbutton on the front of the relay, ensuring one of the following conditions: a) 24 Vdc auxiliary voltage present (display lit); b) circulating primary current higher than 0.2 x In (display lit with indication of the circulating current); c) application of the TT2 unit to the TEST connec- tor on the front of the release (optional acces- sory). N.B. This signalling contact is not enabled if a remote circuit-breaker opening command is given. Resetting takes place 1 s after the pushbutton is pressed. • Microprocessor fault signalling output. A closing contact is available to signal a perma- nent fault in the microprocessor. The contact is of the bistable type and belongs to a relay which keeps the state even in the absence of the power supply and until the RESET opera- tion). Technical data of the relay contacts The signalling relay contacts have the following electrical characteristics: – maximum interrupted current 0.8 A – maximum interrupted voltage 110 Vca/Vcc – maximum interrupted load at 24 Vdc: – inductive (L/R = 7 ms) 10 W – resistive 24 W – maximum interrupted load at 48 Vac: – inductive (cosj = 0.4) 15 VA – resistive 30 VA – contact/contact insulation 500 Veff – contact/coil insulation 1000 Veff Measuring function The liquid crystal display allows the most highly loaded phase current to be shown (this measure- ment is a function of the rated current of the CT set by means of Dip Switches on the front of the unit). When there is no auxiliary power supply, the minimum value displayed is 0.21 x In single- phase and 0.18 x In two-phase. With an auxiliary power supply, it guarantees a minimum value displayed of 0.05 x In. Under this value -LL- (Low Load) is displayed. Precision is 5% ± 1 LSD (Least Significant Digit) for current values from 0.5 to 1.5 x In. CHARACTERISTICS AND ORDERING CODES Ordering codes Protection relay Description Code UXAB PR 512/P (50-51) 399101001 PR 512/P (50-51-50N-51N) 399101002 PR 512/PD (50-5150N-51N + Dialogue) 399101003 TT2 test unit Description Code UXAB TT2 379602231 Opening solenoid (YO3) Description Code UXAB Solenoid for HD4 circuit-breaker 349700311 External toroidal transformer Description Code UXAB Toroid with closed core internal diameter 110 mm - 50/1 A 379602301 Toroid with split core internal diameter 110 mm - 50/1 A 379602302 PR 512/PD with dialogue TT2 test unit Opening solenoid YO3 External toroidal transformer 11 3 Protection functions 12 Protection against overcurrent (51) 12 Selection of threshold I> value 12 Selection of type of I> curve 12 Selection of t> trip time 13 Protection against instantaneous or delayed short-circuit (50) 13 Selection of I>> threshold value 13 Selection of t>> trip time 14 Rated and setting currents 14 PR512/P UNIT (50-51) 12 t> = K x b t> = K x b I I> a – 1 PR512/P UNIT (50-51) Protection functions The PR512/P protection unit (50-51) carries out two independent protec- tion functions which can be ex- cluded: – 51 protection against overcurrent: • 0.2 < I < 2 In (rms) • 2 < I < 20 In (peak); – 50 protection against instantane- ous or delayed short-circuit (operation on peak value). Protection against overcurrent (51) This function makes four different groups of protection curves avail- able, defined as follows (IEC255-3): – definite time-delay – normal inverse time-delay – very inverse time-delay – extremely inverse time-delay. The following settings are possible: • 32 threshold current values (I>) (1) 0.200 0.225 0.250 0.275 0.300 0.325 0.350 0.375 0.400 0.425 0.450 0.475 0.500 0.525 0.550 0.575 0.625 0.650 0.675 0.700 0.725 0.750 0.775 0.800 0.825 0.850 0.875 0.900 0.925 0.950 0.975 1.000 x In OFF (1) The unit guarantees non-entry into threshold for currents under 1.05 x I> set and guarantees entry into threshold for currents above 1.30 x I> set. Selection of threshold I> value Four different time-current relationships can be selected. Fixed time curve (b = 2) For protection with definite time (DT), the trip time is given by the following relationship: Definite time-delay curves For definite time-delay protection, the relationship between trip time and overcurrent is given by the following formula. Caption t> trip time k parameter set by the user to select the trip curve a, b pair of parameters, depending on the type of protection selectable I fault current I> trip threshold selectable by the user The threshold value of this protection is indicated by I>, whereas the relative trip time is indicated by t>. Start of timing is signalled by the ALARM LED lighting up whereas circuit-breaker opening having taken place is signalled on the front by the magnetic flag I> I>>, turned to the yellow position. To reset signalling, the FLAG RESET pushbutton on the front of the release must be pressed, ensuring one of the following conditions: a) 24 Vdc auxiliary voltage present (display lit); b) primary circulating current more than 0.2 x In (display lit with indication of the circulating current); c) application of the TT2 unit to the TEST connec- tor on the front of the release (optional acces- sory). Selection of threshold I> value Setting of I> threshold is carried out by using the Dip Switches (see page 13). The sum of the values selected represents the fraction of In which corresponds to I>. 32 threshold values are available, defined from 0.2 .... 1 x In with steps of 0.025 x In. The protection can be excluded by positioning the first Dip Switch in the OFF position. 13 3 1 2 3 Parameters a and b can take on the following values according to the curve selected. • Normal inverse time-delay curve (NI): a = 0.02 b = 0.14. • Very inverse time-delay curve (VI): a = 1 b = 13.5. • Extremely inverse time-delay curve EI): a = 2 b = 80. Selection of t> trip time The trip time of the protection is adjusted by using the Dip Switches as shown in the figure. By means of the Dip Switches, the value of K is set which, when replaced in the previous relation- ships, determines trip time t>. The following settings are possible: • 16 trip times (t>), (K = 0.1...1.6 with steps of 0.1) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Caption 1 Dip Switch for setting the trip threshold of protection I> 2 Dip Switch for setting timing K of protection I> 3 Dip Switch for selecting the type of curve for protection I>: • DT curve with definite time • NI curve with normal inverse time • VI curve with very inverse time • EI curve with extremely inverse time. Protection against instantaneous or delayed short-circuit (50) This function makes a family of definite adjustable time curves available, indicated by the symbol I>>. The corresponding trip time is indicated by the symbol t>>. Start of timing is signalled by the ALARM LED lighting up, whereas circuit-breaker opening is signalled on the front by the magnetic flag I> I>>, turned to the yellow position. To reset signalling, the FLAG RESET pushbutton on the front of the release must be pressed, ensuring one of the following conditions: a) 24 Vdc auxiliary voltage present (display lit); b) primary circulating current higher than 0.2 x In (display lit with indication of the circulating current); c) application of the TT2 unit to the TEST connec- tor on the front of the release (optional acces- sory). Selection of I>> threshold value Setting the I>> threshold is carried out by working on the Dip Switches as shown in the figure below. The sum of the values selected represents the multiple of I> and corresponds to threshold I>>. N.B. Even if protection I> is OFF, the first Dip Switch takes on the value 0.2. The following settings are possible: • 16 threshold current values (I>>) 2.5 3.5 4.5 5.5 7.5 8.5 9.5 10.5 12 13 14 15 17 18 19 20 x I> OFF 14 3 4 5Selection of t>> trip time The function of protection I>> has a single definite curve adjustable to 31 values. The trip time of the protection is set by using the Dip Switches as shown in the figure. The following settings are possible: • 31 trip times (t>>), (0.05...1.55 with steps of 0.05) 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 1.45 1.50 1.55 s Caption 4 Dip Switch for adjusting the trip threshold of protec- tion I>>. 5 Dip Switch for adjusting the trip time t>> if protection I>>. PR512/P UNIT (50-51) Rated and setting currents In = rated current of current transformer I> = setting value of overload current (51) I>> = setting value of short-circuit current (50) Io> = setting value of earth fault current (first threshold) (51N) Io>> = setting value of earth fault current (second threshold) (50N) (1) If an external toroidal current transformer is used, recalculate the setting values according to its primary rated current. Current Protection functions transformer (CT) In I> I>> Io> Io