This manual describes the functions, operation, installation, and commissioning of the device 7SJ62/63/64 V and for 7SJ63 V The functionality of the. Function overview. Description. Siemens SIP · 5 OvercurrentProtection/ 7SJ 5. 5/ 5/ Protection functions. • Time-overcurrent. of Siemens AG. Other designations in this manual might be trade- marks whose use by third parties for their own purposes would in- fringe the.
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Other designations in this manual might be trade- marks whose use by third parties for their own purposes would in- Release date This conformity has been established by means of tests conducted by Siemens AG in accor- dance with Article 10 of the Council Directive in agreement with the generic standards EN and EN for the EMC directive, and with the standard EN for the low-voltage directive.
Additional Support Should further information on the System SIPROTEC 4 be desired or should particular problems arise which are not covered sufficiently for the purchaser’s purpose, the matter should be referred to the local Siemens rep- resentative.
Our Customer Support Center provides a hour service. Preface Safety Information This manual does not constitute a complete index of all required safety measures for operation of the equip- ment module, deviceas special operational conditions may require additional measures.
However, it com- prises important information that should be noted for purposes of personal safety as well as avoiding material damage. The operational equipment device, module may only be used for such applications as set out in the catalogue and the technical description, and only in combination with third-party equipment recommended or approved by Siemens.
The successful and safe operation of the device is dependent on proper handling, storage, installation, opera- tion, and maintenance.
Preface Typographic and Symbol Conventions The following text formats are used when literal information from the device or to the device appear in the text flow: Parameter Names Designators of configuration or function parameters which may appear word-for-word in the display of the device or on the screen of a personal computer with operation software DIGSIare marked in bold letters in monospace type style.
Some of the most frequently used are listed below: An overview of the devices is pre- sented in their application, characteristics, and scope of functions. It allows all tasks to be processed digitally, from the acquisition of measured quantities to sending com- mands to circuit breakers. Figures and illustrate the basic structure of the 7SJ62 and 7SJ64 and the following paragraphs describe each major element.
The input amplifier IA element provides a high-resistance termination for the input quantities. This facilitates a comfortable handling of all device functions. The devices can be used for line protection in networks that are grounded, low-resistance grounded, ungrounded, or of a compensated neutral point structure.
They are suited for networks that are radial or looped, and for lines with single or multi-terminal feeds. Processing of interlocking conditions for switching e. It shows the setting possibilities for each function in maximum configuration. Information with regard to the determination of setting values as well as formulas, if required, are also provided.
Based on the following information, it can also be determined which of the provided functions should be used. Some parameters may also be changed using the con- trols on the front panel of the device.
The parameters 25 Function 1 to 25 Function 4 indicate whether a synchronization function is Disabled or Enabled. Function 01 Please select Flexible Functions Flex. This may be, for example, the type of annunciation to be issued in the event of a power system fault occurs.
The start page of the default display appearing after startup of the device can be selected in the device data via parameter Start image DD.
These may be, for instance, nominal power system and transformer data, measured quan- tity polarities and their physical connections, breaker properties where applicable etc.
Changing this parameter also results in a polarity reversal of the ground current inputs I or I Figure The standard connection is A, B, C, Gnd.
It may only be changed if the device is set to measure one or more ground currents via two current inputs. Current input Function Time overcurrent protection ground Section 2. In the absence of a fault locator or if this function has been removed, this parameter is of no importance.
Changing the distance unit does not imply an automatic conversion of the setting values that are dependant on the dis- tance unit. This information is relevant for the processing of ground faults in grounded systems and ungrounded systemsfor the operational measured value VN and measured-variable monitoring.
The parameters and the different procedures are explained in the setting notes of this function see Section 2. Two-phase Time Overcurrent Protection Protection Operating Quantities The two-phase overcurrent protection functionality is used in grounded or compensated systems where inter- action of three-phase devices with existing two-phase protection equipment is required.
The table indicates region-specific default settings. Column C configuration indicates the corresponding sec- ondary nominal current of the current transformer.
Other settings pertaining to fault recording waveform capture are found in the Osc. Fault recording is running 2. If these reference sizes match the primary nominal values of the VTs and CTs, they correspond to the settings in address and Section 2. Reactance per Unit Length only for Fault Location The setting of the reactance per unit length is only important for the utilization of the line fault location function.
The reactance setting enables the protective relay to indicate the fault location in terms of distance. The reactance value X’ is entered as a reference value x’, i. In the following, the same line as illustrated in the example for ground impedance ratios above and additional data on the voltage transformers will be used: Line Angle only for Fault Location The setting of the line angle is only important for the utilization of the line fault location function.
Furthermore, when using several line sections, the respective length of the individual sections is defined. Line angle S2: This standard permits uniform com- munication of the devices without gateways and protocol converters. Each phase current and the ground current is provided with four elements. All elements are independent from each other and can be com- bined as desired. The same applies to 79AR inst. The same applies to AR 50N-2 inst.
SIPROTEC 7SJ62 – Digital Grid – Siemens
Each phase and ground current is compared separately with the setting value or 50N-1 for each element. An incoming inrush will reset a running dropout delay time. The same applies to 79 AR 50N-1 inst. They operate with an inverse time characteristic either according to the IEC- or the ANSI-standard or with a user-defined characteristic. The characteristics and associated formulas are given in the Technical Data.
The same applies to 79AR 51 inst. The same applies to 79AR 51N instantaneous. Up to 20 value pairs current, time may be entered. The device then approximates the characteristic, using linear interpola- tion.
The assignment of voltages to current-carrying phases is shown in the following table. Table Controlling voltages in relation to the fault currents Current Voltage — However, the protection feature can be configured to allow that not only this phase element but also the remaining elements including ground are blocked the so-called CROSS BLOCK function, address if the permissible har- monic component of the current is exceeded for only one phase.
Table Pickup annunciations of the overcurrent protection Internal Annunciation As an isolated or resonant-grounded system remains operational with a single-phase ground fault, this protection serves the purpose of detecting double ground faults with high ground fault currents.
Depending on the functional scope specified during config- uration of the protective functions in addresses Charac. This measurement method processes the sampled values of the current and filters in numerical order the fundamental harmonic so that the higher harmonics or transient peak currents remain largely unconsidered. Pickup due to overload should never occur since in this mode the device operates as fault protection with ssiemens respondingly short tripping times and not as overload protection.
It must be coordinated with the grading coordination chart of sieens system. If desired, fewer than 20 pairs can be entered. In most cases, about 10 pairs is sufficient to define the characteristic accurately.
The following must be 7si62 De- viating values of MofPU are rounded. Manual Close Mode 50N-2 instant. All elements may be configured independently from each other and combined as desired.
High-set current elements and overcurrent element always operate with a definite tripping time, the third element TOC operates with an inverse tripping time.
Figure shows a ring system where both energy sources are merged to one single source. The same applies to 79 AR inst. An approaching inrush resets an already running dropout time delay. Failure of the measuring voltage in one or two poles can be detected, and the directional time overcurrent elements Dir Phase and Dir Ground can be blocked see logic diagrams. In the current path, the I current is valid, when the transformer neutral current is connected to the device.
As reference voltage, the negative sequence siemns voltage is used, as current for the direction determination, the negative sequence system current, in which the fault current is displayed. The settings that correspond with the old parameters and are specified as follows.
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Pickup sismens to overload should never occur since in this mode the device operates as 7ssj62 protection with correspondingly short tripping times and 7sjj62 as overload protection.
It must be coordinated with the time grading of the network. They are, therefore, not enabled — and no pickup or tripping of these protective functions will occur. If desired, fewer than 20 pairs may be entered. Figure Example for the generation of a manual close signal using the internal control function Note For an interaction between the automatic reclosing function 79 AR and the control function, an extended CFC logic is necessary.
Only then the parameters are set back to “normal”. If not required, this function should be set to Disabled. Which input is used depends on the device version according to the order number.
Siemens SIPROTEC 7SJ62 Manual
The CTs must be of the same design and feature at least a separate core for high-impedance protection. In particular, they must have the same transformer ratios and approximately identical knee-point voltage.
The grounding conditions in the rest of the network determine how strong a zero sequence current from the system is. For generators, motors and shunt reactors high-impedance protection can be used analogously. The settings are based on the particular application.