Preface Purpose of This Manual This manual describes the functions, operation, installation, and placing into service of the device. Information regarding customizing of the device Chapter 5. Descriptions of device functions and settings Chapter 6. Instructions for operation while in service Chapter 7.
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Control The integrated control function permits control of disconnect Transformer protection 11 devices, grounding switches or circuit-breakers via the inte- grated operator panel, binary inputs, DIGSI 4 or the control and The relay performs all functions of backup protection supple- mentary to transformer differential protection.
The inrush protection system e. The present status or position suppression effectively prevents tripping by inrush currents. A full range of command processing func- 12 tions is provided. Backup protection Programmable logic The 7SJ62 can be used universally for backup protection.
The integrated logic characteristics CFC allow the user to 13 implement their own functions for automation of switchgear Flexible protection functions interlocking or a substation via a graphic user interface.
The 7SJ62 units can be used for line protection of high and medium-voltage networks with earthed grounded , low- Metering values resistance grounded, isolated or compensated neutral point. This means that 7 previous models can always be replaced. The communication interfaces are located in a sloped For easier time coordination with electromechanical relays, reset case at the top and bottom of the housing.
When using the reset characteristic disk emulation , a reset Protection functions process is initiated after the fault current has disappeared.
This reset process corresponds to the reverse movement of the Fer- 10 Overcurrent protection ANSI 50, 50N, 51, 51V, 51N raris disk of an electromechanical relay thus: disk emulation. They are set as pairs of numbers or graphically In addition, inverse-time overcurrent protection characteristics in DIGSI 4. IDMTL can be activated. The relay features second harmonic restraint. If the second harmonic is detected during transformer energization, pickup of 13 non-directional and directional normal elements are blocked.
They operate in parallel to the non-directional overcurrent 1 elements. Their pickup values and delay times can be set sepa- rately. By means of voltage memory, directionality can be determined 2 reliably even for close-in local faults. If the switching device closes onto a fault and the voltage is too low to determine direc- tion, directionality directional decision is made with voltage from the voltage memory.
If no voltage exists in the memory, 3 tripping occurs according to the coordination schedule. For ground protection, users can choose whether the direction is to be determined via zero-sequence system or negative- sequence system quantities selectable. Using negative- 4 sequence variables can be advantageous in cases where the zero Fig.
Directional comparison protection cross-coupling 5 It is used for selective protection of sections fed from two sources with instantaneous tripping, i. In addition to the directional comparison protection, the directional coordinated overcurrent protection is used for complete selective backup protection.
If operated in 7 a closed-circuit connection, an interruption of the transmission line is detected. For special network conditions, e. 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-grounded 2 may undergo thermal overloading.
The normal ground-fault pro- tection cannot reliably detect and interrupt the current pulses, some of which can be very brief. The selectivity required with intermittent ground faults is 3 achieved by summating the duration of the individual pulses and by triggering when a settable summed time is reached. It can also be applied to motors, generators and reactors when these are operated on an grounded network. In the case of 7SJ6 Such intermittent ground faults are frequently caused by weak units, the voltage is measured by detecting the current through insulation, e.
The varistor V serves to limit the voltage in the event of an internal fault. It cuts off the high momentary voltage faults and do not always behave correctly in case of intermittent spikes occurring at transformer saturation.
At the same time, ground faults. If no faults have occurred and in the event of external faults, the Phase-balance current protection ANSI 46 system is at equilibrium, and the voltage through the resistor is Negative-sequence protection approximately zero. This provides backup protection for high- ground-fault protection. They must in particular have the same transformation ratio and an approximately identical knee-point resistance faults beyond the transformer. As an option, it is possible to make use of the circuit-breaker position indication.
Almost all quantities can be oper- ated as greater than or less than stages. All stages operate with protection priority. The calculated temperature is constantly The undervoltage-controlled reactive power protection protects adjusted accordingly.
Thus, account is taken of the previous load the system for mains decoupling purposes. To prevent a voltage collapse in energy systems, the generating side, e. An undervoltage-controlled reactive power protection is be detected correctly while the motor is rotating and when it is required at the supply system connection point. It detects critical power system situations and ensures that the power generation stopped. The ambient temperature or the temperature of the coolant can be detected serially via an external temperature 10 facility is disconnected from the mains.
Furthermore, it ensures monitoring box resistance-temperature detector box, also that reconnection only takes place under stable power system called RTD-box. The thermal replica of the overload function conditions. The associated criteria can be parameterized. In case of switching ON the circuit- breaker, the units can check whether the two subnetworks are synchronized. Settable dropout delay times Voltage-, frequency- and phase-angle-differences are being If the devices are used in parallel with electromechanical relays 12 checked to determine whether synchronous conditions are in networks with intermittent faults, the long dropout times of existent.
The following for certain functions such as time-over-current protection, functions are possible: ground short-circuit and phase-balance current protection. The rotor temperature 2 is calculated from the stator current. Emergency start-up This function disables the reclosing lockout 4 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. The thermal status of motors, generators and transformers can be monitored with this Sudden high loads can cause slowing down and blocking of device.
Additionally, the temperature of the bearings of rotating the motor and mechanical damages. The rise of current due machines are monitored for limit value violation. The tempera- to a load jam is being monitored by this function alarm and tures are being measured with the help of temperature detectors tripping. This data is The overload protection function is too slow and therefore not transmitted to the protection relay via one or two temperature suitable under these circumstances.
Rotor temperature is calculated from measured stator current. The tripping time is calculated according to the Undercurrent monitoring ANSI 37 following equation: With this function, a sudden drop in current, which can occur due to a reduced motor load, is detected.
The function can The characteristic equation can be adapted optimally to the operate either with phase-to-phase, phase-to-ground, positive 13 state of the motor by applying different tripping times TA in dependence of either cold or warm motor state. For differentia- phase-sequence or negative phase-sequence system voltage. Three-phase and single-phase connections are possible. Undervoltage protection ANSI 27 If the trip time is rated according to the above formula, even a The two-element undervoltage protection provides protec- 14 prolonged start-up and reduced voltage and reduced start-up current will be evaluated correctly.
The tripping time is inverse tion against dangerous voltage drops especially for electric machines. Applications include the isolation of generators or current dependent.
Proper operating conditions 15 An instantaneous tripping is effected. 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. Frequency protection can be used over a wide frequency range 40 to 60, 50 to 70 Hz 1.
There are four elements select- able 4 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 status of the binary inputs can be read individually and the state of the binary outputs can be set individually. The analog measured values are represented as wide- ranging operational measured values.
To prevent transmission of 8 opens. To do controller communications can be disabled to prevent unneces- sary data from being transmitted. After CB support all control and monitoring functions that are required opening, the two-point method calculates the number of still for operating medium-voltage or high-voltage substations.
To this end, the two points P1 and P2 only have to be set on the device. All of these methods are phase-selective and a limit value can be The status of primary equipment or auxiliary devices can be set in order to obtain an alarm if the actual value falls below or obtained from auxiliary contacts and communicated to the exceeds the limit value during determination of the remaining 7SJ62 via binary inputs.
The switchgear or circuit-breaker can be controlled via: Additional functions, which are not time critical, can be imple- mented via the CFC using measured values. Typical functions — integrated operator panel — binary inputs 14 include reverse power, voltage controlled overcurrent, phase — substation control and protection system angle detection, and zero-sequence voltage detection. Functions are activated via function keys, binary input or via communication interface.
Switching authority 2 Switching authority is determined according to parameters and communication. Command processing All the functionality of command processing is offered. This 4 LSPf. In general, no separate measuring instruments e. These indication voltage, frequency, … or additional control components are inputs are logically assigned to the corresponding command necessary. The unit can therefore distinguish whether the indica- Measured values tion change is a consequence of switching operation or whether 9 it is a spontaneous change of state.
Siemens SIPROTEC 7SJ62 Manuals
Purpose of This This manual describes the functions, operation, installation, and placing into service Manual of the device. Target Audience Protection engineers, commissioning engineers, personnel concerned with adjust- ment, checking, and service of selective protective equipment, automatic and control facilities, and personnel of electrical facilities and power plants. This product is UL—certified with the data as stated in Section Training Courses Individual course offerings may be found in our Training Catalog, or questions can be directed to our training center.
The relay performs all functions of backup protection supplementary to transformer differential protection. Up to 20 protection functions can be added according to individual requirements. Thus, for example, a rate-of-frequency-change protection or reverse power protection can be implemented. The relay provides control of the circuit-breaker and automation functions. The integrated programmable logic CFC allows the user to implement their own functions, e.