Contents
  1. 7SJ62 manual.pdf
  2. 7SJUser hohounsmolathe.ga | Power Supply | Trademark
  3. Siemens SIPROTEC 7SJ62 Manuals
  4. Multifunction protection

This manual is intended mainly for all persons who configure, parameterize and operate. SIPROTEC Devices 7SJ61, 7SJ62 and 7SJ Scope of validity of this. The SIPROTEC 7SJ62 relays can be used for line protection of high and medium voltage networks with earthed (grounded), low-resistance earthed, isolated or. Aug 16, The SIPROTEC 4 7SJ62 relays can be used When protecting motors, the 7SJ62 relay is suitable and manual electric tripping is no longer.

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7sj62 Manual Pdf

Feb 25, Applicability of this Manual. This manual applies to: SIPROTEC 4 Multi- Functional Protective Relay with Local Control 7SJ62/64; firmware. View and Download Siemens SIPROTEC 7SJ62 manual online. Multi-Functional Protective Relay with Local Control. SIPROTEC 7SJ62 Relays pdf manual. Manuals and User Guides for Siemens SIPROTEC 7SJ We have 3 Siemens SIPROTEC 7SJ62 manuals available for free PDF download: Manual, Instruction .

Application Fig. Local operation has been designed according to ergonomic criteria. A large, easy-toread display was a major design aim. Control The integrated control function permits control of disconnect devices, earthing switches or circuit-breakers via the integrated operator panel, binary inputs, DIGSI 4 or the control and protection system e. A full range of command processing functions is provided. Programmable logic The integrated logic characteristics CFC allow the user to implement their own functions for automation of switchgear interlocking or a substation via a graphic user interface. The user can also generate user-defined messages. Line protection The 7SJ62 units can be used for line protection of high and medium-voltage networks with earthed grounded , lowresistance earthed, isolated or compensated neutral point.

Metering values Extensive measured values, limit values and metered values permit improved system management.

This means that previous models can always be replaced. The height is a uniform mm for flushmounting housings and mm for surface-mounting housing. All cables can be connected with or without ring lugs.

In the case of surface mounting on a panel, the connection terminals are located above and below in the form of screw-type terminals.

The communication interfaces are located in a sloped case at the top and bottom of the housing. Three definite-time overcurrent protection elements DMT exist both for the phases and for the earth. The current threshold and the delay time can be set within a wide range. The inverse-time function provides as an option voltage-restraint or voltagecontrolled operating modes.

Inrush restraint The relay features second harmonic restraint. If the second harmonic is detected during transformer energization, pickup of non-directional and directional normal elements are blocked. When using the reset characteristic disk emulation , a reset process is initiated after the fault current has disappeared.

This reset process corresponds to the reverse movement of the Ferraris disk of an electromechanical relay thus: disk emulation.

They operate in parallel to the non-directional overcurrent elements. Their pickup values and delay times can be set separately. Definite-time and inverse-time characteristics are offered.

The tripping characteristic can be rotated about degrees. By means of voltage memory, directionality can be determined reliably even for close-in local faults. If the switching device closes onto a fault and the voltage is too low to determine direction, directionality directional decision is made with voltage from the voltage memory.

If no voltage exists in the memory, tripping occurs according to the coordination schedule. The inrush suppression effectively prevents tripping by inrush currents. The high-impedance restricted earth-fault protection detects short-circuits and insulation faults on the transformer. Backup protection The 7SJ62can be used universally for backup protection.

Metering values Extensive measured values, limit values and metered values permit improved system management. This means that previous models can always be replaced. The height is a uniform mm for flushmounting housings and mm for surface-mounting housing for all housing widths. All cables can be connected with or without ring lugs. In the case of surface mounting on a panel, the connection terminals are located above and below in the form of screw-type terminals.

The communication interfaces are located in a sloped case at the top and bottom of the housing. Two definite-time overcurrent protection elements DMT exist both for the phases and for the earth. The current threshold and the delay time can be set within a wide range. When using the reset characteristic disk emulation , a reset process is initiated after the fault current has disappeared.

This reset process corresponds to the reverse movement of the Ferraris disk of an electromechanical relay thus: disk emulation. User-definable characteristics Instead of the predefined time characteristics according to ANSI, tripping characteristics can be defined by the user for phase and earth units separately.

Inrush restraint The relay features second harmonic restraint. If the second harmonic is detected during transformer energization, pickup of non-directional and directional normal elements are blocked. They operate in parallel to the non-directional overcurrent elements.

Their pickup values and delay times can be set separately. Definite-time and inversetime characteristics are offered. By means of voltage memory, directionality can be determined reliably even for close-in local faults.

If the switching device closes onto a fault and the voltage is too low to determine direction, directionality directional decision is made with voltage from the voltage memory. If no voltage exists in the memory, tripping occurs according to the coordination schedule. For earth protection, users can choose whether the direction is to be determined via zero-sequence system or negative-sequence system quantities selectable. Using negative-sequence variables can be advantageous in cases where the zero voltage tends to be very low due to unfavorable zero-sequence impedances.

The directional comparison protection is suitable if the distances between the protection stations are not significant and pilot wires are available for signal transmission. In addition to the directional comparison protection, the directional coordinated timeovercurrent protection is used for complete selective backup protection. If operated in a closed-circuit connection, an interruption of the transmission line is detected.

Sensitive directional earth-fault detection ANSI 64, 67Ns, 67N For isolated-neutral and compensated networks, the direction of power flow in the zero sequence is calculated from the zerosequen- ce current I 0 and zero-sequence voltage V 0. For networks with an isolated neutral, the reactive current component is evaluated; for compensated networks, the active current component or residual resistive current is evaluated.

For special network conditions, e. Two modes of earth-fault direction detection can be implemented: tripping or signalling only mode. Two instantaneous elements or one instantaneous plus one user-defined characteristic.

The function can also be operated in the insensitive mode as an additional short-circuit protection. The function can also be operated in the insensitive mode as an additional shortcircuit protection. Such faults either simply cease at some stage or develop into lasting short-circuits. During intermittent activity, however, star-point resistors in networks that are impedance-earthed may undergo thermal overloading.

The normal earth-fault protection cannot reliably detect and interrupt the current pulses, some of which can be very brief. The selectivity required with intermittent earth faults is achieved by summating the duration of the individual pulses and by triggering when a settable summed time is reached.

This provides backup protection for high-resistance faults beyond the transformer. Breaker failure protection ANSI 0BF If a faulted portion of the electrical circuit is not disconnected upon issuance of a trip command, another command can be initiated using the breaker failure protection which operates the circuit-breaker, e.

Breaker failure is detected if, after a trip command, current is still flowing in the faulted circuit.

7SJ62 manual.pdf

As an option, it is possible to make use of the circuit-breaker position indication. High-impedance restricted earth-fault protection ANSI 87N The high-impedance measurement principle is an uncomplicated and sensitive method for detecting earth faults, especially on transformers.

It can also be applied to motors, generators and reactors when these are operated on an earthed network. When the high-impedance measurement principle is applied, all current transformers in the protected area are connected in parallel and operated on one common resistor of relatively high R whose voltage is measured see Fig. In the case of 7SJ6 units, the voltage is measured by detecting the current through the external resistor R at the sensitive current measurement input I EE.

The varistor V serves to limit the voltage in the event of an internal fault. It cuts off the high momentary voltage spikes occurring at transformer saturation. At the same time, this results in smoothing of the voltage without any noteworthy reduction of the average value. If no faults have occurred and in the event of external faults, the system is at equilibrium, and the voltage through the resistor is approximately zero.

In the event of internal faults, an imbalance occurs which leads to a voltage and a current flow through the resistor R. The current transformers must be of the same type and must at least offer a separate core for the high-impedance restricted earth-fault protection.

They must in particular have the same transformation ratio and an approximately identical knee-point voltage.

They should also demonstrate only minimal measuring errors. Auto-reclosure ANSI 79 Multiple reclosures can be defined by the user and lockout will occur if a fault is present after the last reclosure. The temperature is calculated using a thermal homogeneousbody model according to IEC , which takes account both of the energy entering the equipment and the energy losses. The calculated temperature is constantly adjusted accordingly.

Thus, account is taken of the previous load and the load fluctuations. For thermal protection of motors especially the stator a further time constant can be set so that the thermal ratios can be detected correctly while the motor is rotating and when it is stopped. The ambient temperature or the temperature of the coolant can be detected serially via an external temperature monitoring box resistance-temperature detector box, also called RTD- box.

The thermal replica of the overload function is automatically adapted to the ambient conditions. They must in particular have the same transformation ratio and an approximately identical knee-point voltage.

They should also demonstrate only minimal measuring errors. To this end, parameter definitions are used to link a standard protection logic with any chosen characteristic quantity measured or derived quantity Fig. The standard logic consists of the usual protection elements such as the pickup message, the parameter-definable delay time, the TRIP command, a blocking possibility, etc.

The mode of operation for current, voltage, power and power factor quantities can be three-phase or single-phase. Almost all quantities can be operated as greater than or less than stages. All stages operate with protection priority. The temperature is calculated using a thermal homogeneousbody model according to IEC , which takes account both of the energy entering the equipment and the energy losses.

The calculated temperature is constantly adjusted accordingly. Thus, account is taken of the previous load and the load fluctuations. For thermal protection of motors especially the stator a further time constant can be set so that the thermal ratios can be detected correctly while the motor is rotating and when it is stopped.

The ambient temperature or the temperature of the coolant can be detected serially via an external temperature monitoring box resistance-temperature detector box, also called RTD- box. The thermal replica of the overload function is automatically adapted to the ambient conditions. If there is no RTD-box it is assumed that the ambient temperatures are constant.

Settable dropout delay times If the devices are used in parallel with electromechanical relays in networks with intermittent faults, the long dropout times of the electromechanical devices several hundred milliseconds can lead to problems in terms of time grading.

Clean time grading is only possible if the dropout time is approximately the same. This is why the parameter of dropout times can be defined for certain functions such as time-overcurrent protection, earth short-circuit and phase-balance current protection.

Voltage-, frequency- and phase-angledifferences are being checked to determine whether synchronous conditions are existent. The rotor temperature is calculated from the stator current.

7SJUser hohounsmolathe.ga | Power Supply | Trademark

The reclosing lockout only permits start-up of the motor if the rotor has sufficient thermal reserves for a complete start-up see Fig. Emergency start-up This function disables the reclosing lockout via a binary input by storing the state of the thermal replica as long as the binary input is active. It is also possible to reset the thermal replica to zero.

Temperature monitoring ANSI 38 Up to two temperature monitoring boxes with a total of 12 measuring sensors can be used for temperature monitoring and detection by the protection relay. The thermal status of motors, generators and transformers can be monitored with this device. Additionally, the temperature of the bearings of rotating machines are monitored for limit value violation.

The temperatures are being measured with the help of temperature detectors at various locations of the device to be protected. Rotor temperature is calculated from measured stator current. For differentiation of the motor state the thermal model of the rotor is applied. If the trip time is rated according to the above formula, even a prolonged start-up and reduced voltage and reduced start-up current will be evaluated correctly.

The tripping time is inverse current dependent. A binary signal is set by a speed sensor to detect a blocked rotor.

An instantaneous tripping is effected. Load jam protection ANSI 51M Sudden high loads can cause slowing down and blocking of the motor and mechanical damages.

The rise of current due to a load jam is being monitored by this function alarm and tripping. The overload protection function is too slow and therefore not suitable under these circumstances. Undercurrent monitoring ANSI 37 With this function, a sudden drop in current, which can occur due to a reduced motor load, is detected. This may be due to shaft breakage, no-load operation of pumps or fan failure. Motor statistics Essential information on start-up of the motor duration, current, voltage and general information on number of starts, total operating time, total down time, etc.

The function can operate either with phase-to-phase, phase-to-earth, positive phase-sequence or negative phase-sequence system voltage. Three-phase and single-phase connections are possible. Undervoltage protection ANSI 27 The two-element undervoltage protection provides protection against dangerous voltage drops especially for electric machines. Applications include the isolation of generators or motors from the network to avoid undesired operating states and a possible loss of stability.

Proper operating conditions of electrical machines are best evaluated with the positive-sequence quantities.

Siemens SIPROTEC 7SJ62 Manuals

The protection function is active over a wide frequency range 45 to 55, 55 to 65 Hz 1. Even when falling below this frequency range the function continues to work, however, with a greater tolerance band. Electric machines and parts of the system are protected from unwanted speed deviations. Unwanted frequency changes in the network can be detected and the load can be removed at a specified frequency setting.

Frequency protection can be used over a wide frequency range 40 to 60, 50 to 70 Hz 1. There are four elements selectable as overfrequency or underfrequency and each element can be delayed separately. Blocking of the frequency protection can be performed if using a binary input or by using an undervoltage element.

The results are displayed in , kilometers miles and in percent of the line length. Circuit-breaker wear monitoring Methods for determining circuit-breaker contact wear or the remaining service life of a circuit-breaker CB allow CB maintenance intervals to be aligned to their actual degree of wear.

The benefit lies in reduced maintenance costs. There is no mathematically exact method of calculating the wear or the remaining service life of circuit-breakers that takes into account the arc-chamber's physical conditions when the CB opens. This is why various methods of determining CB wear have evolved which reflect the different operator philosophies.

Multifunction protection

To do justice to these, the devices offer several methods: I 2 The CB manufacturers double-logarithmic switching cycle diagram see Fig. After CB opening, the two-point method calculates the number of still possible switching cycles. To this end, the two points P1 and P2 only have to be set on the device. These are specified in the CB's technical data. All of these methods are phase-selective and a limit value can be set in order to obtain an alarm if the actual value falls below or exceeds the limit value during determination of the remaining service life.

Additional functions, which are not time critical, can be implemented via the CFC using measured values. Typical functions include reverse power, voltage controlled overcurrent, phase angle detection, and zero-sequence voltage detection. The status of the binary inputs can be read individually and the state of the binary outputs can be set individually.

The operation of switching elements circuit-breakers, disconnect devices can be checked using the switching functions of the bay controller.

The analog measured values are represented as wide-ranging operational measured values. To prevent transmission of information to the control center during maintenance, the bay controller communications can be disabled to prevent unnecessary data from being transmitted.

During commissioning, all indications with test marking for test purposes can be connected to a control and protection system. Test operation During commissioning, all indications can be passed to an automatic control system for test purposes.

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